U.S. patent application number 12/011955 was filed with the patent office on 2008-06-05 for zippered film and bag.
Invention is credited to James W. Yeager.
Application Number | 20080132394 12/011955 |
Document ID | / |
Family ID | 46252570 |
Filed Date | 2008-06-05 |
United States Patent
Application |
20080132394 |
Kind Code |
A1 |
Yeager; James W. |
June 5, 2008 |
Zippered film and bag
Abstract
Recloseable bags, plastic film for making the bags, and a method
and apparatus for making the bags are disclosed. The bag has a
recloseable fastener (26) connected to a single wall of the bag,
and the film (55) has a recloseable fastener (26) connected to one
side thereofwhich does not require attachment to any other portion
of the film (55) when making a bag. The fastener (26) has a
tamper-proof member attached thereto to indicate if the bag has
been previously opened. The film (55) can be wound into a roll (54)
suitable for use on conventional bag making machines including
form, fill, and seal machines or a chain of coilable recloseable
bags can be produced therefrom since the fasteners (26) are
connected to the web preferably transversely to the bags
longitudinal formation axis. The method and apparatus for making
the film (55) includes supplying a continuous web of bag making
material, feeding from a coil of continuous fastener material
enough fastener material to make a single fastener, (26)
positioning, cutting, and attaching the fastener (26) to the film
(55), with a plurality of fasteners (26) attached thereon.
Inventors: |
Yeager; James W.; (Mobile,
AL) |
Correspondence
Address: |
WOOD, PHILLIPS, KATZ, CLARK & MORTIMER
500 W. MADISON STREET, SUITE 3800
CHICAGO
IL
60661
US
|
Family ID: |
46252570 |
Appl. No.: |
12/011955 |
Filed: |
January 29, 2008 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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11505008 |
Aug 16, 2006 |
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12011955 |
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10914995 |
Aug 10, 2004 |
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11505008 |
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09748467 |
Dec 26, 2000 |
6779921 |
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10914995 |
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09456179 |
Dec 7, 1999 |
6177172 |
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09748467 |
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09294957 |
Apr 20, 1999 |
6019512 |
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09456179 |
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08957304 |
Oct 23, 1997 |
5902047 |
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09294957 |
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08501900 |
Aug 9, 1995 |
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08957304 |
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08275281 |
Jul 12, 1994 |
5461845 |
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08501900 |
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07966427 |
Oct 26, 1992 |
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08275281 |
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Current U.S.
Class: |
493/214 ;
493/243 |
Current CPC
Class: |
Y10T 428/24025 20150115;
B31B 2155/00 20170801; B31B 70/982 20170801; B65D 33/002 20130101;
B65B 61/188 20130101; B65D 33/2508 20130101; B65D 33/2525 20130101;
Y10T 24/45168 20150115; Y10S 24/50 20130101; B31B 70/8133 20170801;
B31B 2155/002 20170801; B65D 33/2583 20130101; B65D 33/2533
20130101; Y10T 428/13 20150115; B31B 2160/10 20170801; Y10T
428/24008 20150115; B31B 70/946 20170801; B31B 70/942 20170801;
B31B 2155/0012 20170801; B31B 2155/003 20170801; Y10S 206/81
20130101; B65D 33/2575 20130101 |
Class at
Publication: |
493/214 ;
493/243 |
International
Class: |
B31B 1/90 20060101
B31B001/90; B31B 1/26 20060101 B31B001/26 |
Claims
1-49. (canceled)
50. A method for making recloseable bags, comprising: a. supplying
a thermoplastic film of bag material having two side edges parallel
to a forming axis by feeding said film material in a longitudinal
direction; b. connecting at least one recloseable fastener
assembly, having two profile strips that are interlocked with each
other, to one side of said film material by feeding said fastener
assembly transverse to said forming axis; c. providing at least one
of said profile strips with a continuous arm and connecting the
continuous arm to one side of said film, wherein said one of said
profile strips includes an extruded body, with said continuous arm
extending from said extruded body and having a width greater than a
width of said extruded body, and connecting said one of said
profile strips to said one side of said film material by seal means
joining at least a portion of said continuous arm to said one side
of said film, and connecting the other of said profile strips to
one side of said film material, wherein said one side of said film
provides an inside surface of a front wall and a back wall of each
of said recloseable bag; d. folding said film of bag material to
form said front wall and said back wall by overlapping said two
side edges; e. forming a back seam connecting said side edges of
said film, and joining said front wall to said back wall to form at
least one end seam that is transverse to said forming axis of said
film material to form a bag.
51. A method of making recloseable bags in accordance with claim
50, including: securing each end of each of said two profile strips
to said film material whereby air and liquids are prevented from
entering or leaving through said ends when a bag is formed from
said film material and after the front wall has been opened to gain
access to the recloseable fastener assembly.
52. A method of making recloseable bags in accordance with claim
51, wherein: each said recloseable fastener assembly is less than
one-half the width of said of thermoplastic film of bag
material.
53. A method of making recloseable bags in accordance with claim
50, wherein: said seal means is spaced from said extruded body of
said one of said profile strips.
54. A method of making recloseable bags in accordance with claim
50, wherein: each of said profile strips includes an extruded body,
wherein at least one of said profile strips is joined to said web
of film material by seal means at said extruded body thereof.
55. A method of making recloseable bags in accordance with claim
50, wherein: a portion of said film adjacent said recloseable
fastener assembly can be opened to gain access to said recloseable
fastener assembly.
56. A method of making recloseable bags in accordance with claim
55, wherein: said portion of said film that can be opened comprises
perforations.
57. A method for making recloseable bags comprising: a. supplying a
thermoplastic film of bag material having two side edges parallel
to a forming axis by feeding said film material in a longitudinal
direction; b. connecting at least one recloseable fastener
assembly, having two profile strips that are interlocked with each
other, to one side of said film material by feeding said fastener
assembly in a direction substantially perpendicular to said two
side edges; c. providing at least one of said profile strips with a
continuous arm and connecting the continuous arm to one side of
said film, wherein said one of said profile strips includes an
extruded body, with said continuous arm extending from said
extruded body and having a width greater than a width of said
extruded body, and connecting said one of said profile strips to
said one side of said film material by seal means joining at least
a portion of said continuous arm to said one side of said film, and
connecting the other of said profile strips to said one side of
said film material, wherein said one side of said film provides an
inside surface of a front wall and a back wall of each of said
recloseable bag; d. folding said film of bag material to form said
front wall and said back wall by overlapping said two side edges;
e. forming a back seam connecting said side edges of said film, and
joining said front wall to said back wall to form at least one end
seam that is transverse to said forming axis of said film material
to form a bag.
58. A method of making recloseable bags in accordance with claim
57, including: securing each end of each of said two profile strips
to said film material whereby air and liquids are prevented from
entering or leaving through said ends when a bag is formed from
said film material and after the front wall has been opened to gain
access to the recloseable fastener assembly.
59. A method of making recloseable bags in accordance with claim
50, wherein: each said recloseable fastener assembly is less than
one-half the width of said thermoplastic sheet of film of bag
material.
60. A method of making recloseable bags in accordance with claim
57, wherein: said seal means is spaced from said extruded body of
said one of said profile strips.
61. A method of making recloseable bags in accordance with claim
57, wherein: each of said profile strips includes an extruded body,
wherein at least one of said profile strips is joined to said web
of film material by seal means at said extruded body thereof.
62. A method of making recloseable bags in accordance with claim
57, wherein: a portion of said film adjacent said recloseable
fastener assembly can be opened to gain access to said recloseable
fastener assembly.
63. A method of making recloseable bags in accordance with claim
62, wherein: said portion of said film that can be opened comprises
perforations.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. Ser. No.
11/505,008, filed Aug. 16, 2006, which is a continuation of U.S.
Ser. No. 10/914,995, filed Aug. 10, 2004, which is a continuation
of application Ser. No. 09/748,467 filed Dec. 26, 2000, now U.S.
Pat. No. 6,799,921 issued Aug. 24, 2004; which is a continuation of
No. 09/456,179 filed Dec. 8, 1999, now U.S. Pat. No. 6,177,172,
issued Jan. 23, 2001; which is a continuation of No. 09/294,957
filed Apr. 20, 1999, now U.S. Pat. No. 6,019,512, issued Feb. 1,
2000; which is a continuation of No. 08/957,304 filed Oct. 23,
1997, now U.S. Pat. No. 5,902,047, issued May 11, 1999; which is a
continuation of No. 08/501,900 filed Sep. 9, 1995, now abandoned;
which is a continuation of No. 08/275,281 filed Jul. 12, 1994; now
U.S. Pat. No. 5,461,845, issued Oct. 31, 1995; which is a
continuation of No. 07/966,427 filed Oct. 26, 1992, now
abandoned.
TECHNICAL FIELD
[0002] The invention relates to recloseable fasteners for
attachment to plastic film, plastic film having a recloseable
fastener transversely attached thereon, bags made from plastic film
having a recloseable fastener attached thereto, and methods and
apparatus for making film and bags having recloseable fasteners
attached thereto. Even more particularly, the present invention is
related to plastic film having a recloseable fastener thereon which
may be used (a) in a form, fill, and seal packaging machine to
package items in a recloseable bag and (b) to make recloseable bags
which may be connected to one another.
BACKGROUND OF THE INVENTION
[0003] Plastic bags are well known in the art. Such bags may be
used for containing a variety of items. A popular use for plastic
bags is to contain and display food items such as poultry and the
like. Exemplary of the prior art are the following patents:
[0004] U.S. Pat. No. 5,116,140 discloses an easy-to-open synthetic
resin bag including (a) a bag body substantially composed of a pair
of laminated walls made of synthetic resin films, the peripheries
of the laminated walls being heat-sealed to form a sealed border
region while defining an unsealed storing space within the sealed
border region, (b) a tear string which is heat sealed along an
imaginary opening line on the inside of one of the laminated walls,
the tear string having both ends thereof heat sealed in a
sandwiched condition on the corresponding portion of the sealed
border region, (c) a pulling tab formed by cutting a part of one
side portion of the sealed bolder region which corresponds to one
end of the tear string, the pulling tab being tearable from the bag
body integrally with the tear string, and (d) a tear string
retaining portion including a transverse opening which is formed by
cutting off a part of the other side portion of the sealed border
region and a pair of inside and outside heat sealed portions which
are located at both sides of the transverse opening, the transverse
opening extending in a direction perpendicular to the tear string
such that the tear string passes through a central portion of the
transverse opening. Due to such a tear string, retaining portion,
the separation and complete removal of the tear string from the bag
is reliably prevented while assuring the easy bag opening
operation.
[0005] U.S. Pat. No. 5,050,736 discloses a recloseable package
including interlocking closure strips positioned outside of a
hermetic seal or seal area and the method for producing same. The
hermetic seal is of the easy-open or peelaway type so as to not
destroy the integrity of the package or closure strips upon opening
of the package.
[0006] U.S. Pat. No. 5,036,543 discloses a form, fill, seal and
separate packaging machine forecloseable containers to web by a
plurality of stations disposed along a path of travel of a
thermoplastic web including a device to attach a pair of mated,
resealable closure strips to the base web. The machine is
intermittent in its operation, with movement of the web through the
machine controlled so that the various steps of applying the
closure strips, forming, filling, sealing and separating the
recloseable containers are performed during periodic stops of the
machine. The machine is further characterized by its use of two
pairs of web belts to move the web through the machine. A first
pair of web belts initially receive the folded web stock and
partially form and completely fill the containers. The second pair
of web belts overlap with the downstream end of the first pair of
belts, but are disposed lower than the first belts. When the filled
partially formed containers pass from the first pair of belts to
the second pair of belts, the unsealed free ends are exposed for
final sealing and severing.
[0007] U.S. Pat. No. 5,022,530 discloses a modified zipper elements
for easy open containers having interlocking zipper elements and a
tear strip for opening the container along the upper edge, wherein
the bases of the zipper elements are extended upward towards the
tear strip to limit the area of tearing and protect the zipper
elements, and a method for making.
[0008] U.S. Pat. No. 4,909,017 discloses a recloseable bag
material, method and apparatus which is a new method of making a
form fill bag having a recloseable fastener thereon and a mechanism
therefor wherein a continuous length of film is advanced and joined
first and second fastener profile strips are laid laterally onto
the film of a length substantially equal to one-half of the film
width, the film is advanced and formed into a tube with the side
edges folded together and seamed, the first profile strip is
attached to the surface of the film prior to forming it into the
tube and the second opposed interlocked profile strip is attached
to the inner surface of the film after it is formed into a tube,
and a cross-seam is formed in the tube above the closure strip to
form the bottom of the succeeding bag, and a completed bag is cut
from the film by cutting below the bottom seam and above the
fastener strips.
[0009] U.S. Pat. No. 4,894,975 discloses a method and apparatus for
making recloseable bags with fastener strips in a form fill and
seal machine from a supply of thin thermoplastic film with the film
being formed into tubular shape about a filling tube with the edges
of the film brought together and joined solely by a zipper strip
having recloseable pressure interlocking members thereon with the
zipper strip preferably heat sealed to the film and the zipper
strip having a web between the pressure interlocking members which
provides a tamper-evident juncture between the edges of the film so
that the web must be severed for access to the interior of a bag
formed from the film, and individual bags formed from the
continuous tube by filing the tube through the filling tube and
cross-seaming and cutting individual bags from the continuous film
tube.
[0010] U.S. Pat. No. 4,782,951 discloses a recloseable package and
method of making recloseable package including interlocking closure
strips positioned outside of a hermetic seal or seal area and the
method for producing same. The hermetic seal is of the easy-open or
peelaway type so as to not destroy the integrity of the package or
closure strips upon opening of the package.
[0011] U.S. Pat. No. 4,617,683 disclosed a recloseable bag,
material, and method of and a device for making same wherein in one
aspect extruded resiliently flexible plastic profiled recloseable
fastener strip device for recloseable bags is located across the
longitudinal formation axis of the bag wall web material, and in
another aspect of the invention single strip fastener strip has at
one or more suitable locations there along separations across the
profiles, such as notches, to facilitate bending or folding of the
strip upon itself so that the self-interlocking profiles of the
portions of the strip folded upon themselves are adapted for
recloseable interlocking with one another. The interlockable
portions of the strip may have separable airtight sealing ribs
therealong. The web and fastener material and fastener assembly is
especially suitable for machines wherein the bags are formed,
filled and sealed.
[0012] U.S. Pat. No. 4,241,865 discloses a recloseable shipping
sack and method, the sack having a pouring mouth from which
discrete pourable contents may be discharged, including a primary
non-recloseable stitched closure fastener across and closing the
mouth against unintentional discharge of the contents and including
a device such as chain stitch and rip strip for facilitating
digital opening of the primary closure fastener. A secondary,
recloseable fastener, desirably of the zipper type, extends across
the sack mouth outwardly from the primary closure fastener and is
adapted for selectively opening and closing the sack mouth after
opening of the primary closure fastener. A method of making the
recloseable sack is also disclosed.
[0013] U.S. Pat. No. 3,473,589 discloses a plastic bag having a
closure structure and a method for making same, the structure
having a first thin inner layer of flexible plastic material with a
first fastener element extending therealong formed of a resilient
material and being of one piece with the layer, a second thin layer
of flexibly plastic material facing the first layer and having a
uniform second fastener element extending therealong formed of a
resilient material and being of one piece with the second layer and
shaped to be releasably interlocked with the first fastener
element, a first outer layer positioned over the outer surface of
the first inner layer and laminated thereto, the first inner and
outer layers providing a first substantially monolithic wall so
that the first inner layer provides a support with the layers
coacting and allowing a stronger lock with a thin film, and a
second outer layer positioned over the outer surface of the second
inner layer and laminated thereto, the second inner and outer
layers providing a second substantially monolithic wall so that the
second inner layer provides a backing for the support allowing a
stronger lock with a thin film, the outer layers laminated to the
inner layer opposite fastener elements so as to reinforce the inner
layers in the area of the fastener elements.
BRIEF SUMMARY OF THE INVENTION
[0014] In accordance with the first embodiment of the present
invention there is provided a recloseable bag made from plastic
film having recloseable fastener assemblies thereon, film having a
recloseable fastener assembly attached thereon, and a method for
making recloseable bags from plastic film having recloseable
fastener assemblies thereon. The recloseable bag has a recloseable
fastener assembly connected to a single wall of the bag, and the
film has a recloseable fastener connected to one side thereof which
does not require attachment to any other portion of the film when
making a bag. The fastener may have an easy bag opening
tamper-proof member attached thereto to indicate if the bag has
been previously opened.
[0015] The film of the invention has the advantage of having a
recloseable fastener assembly completely connected thereto prior to
being fed to a bag making machine or a form, fill, and seal
machine, thereby eliminating the need to apply a recloseable
fastener assembly during the bag making process or during the form,
fill, and seal process, thereby eliminating the need for the
equipment necessary to add a recloseable fastener during the form,
fill, and seal process.
[0016] The film of the invention has the additional advantage of
being capable of forming a recloseable bag on a vertical or
horizontal form, fill, and seal machine.
[0017] The bag and film of the invention has the advantage of
allowing the recloseable fastener assembly to be located at any
desired distance from the top or bottom of the bag because the
fastener assembly is attached to only one wall of the bag of the
invention. The length of the fastener assembly may be much less
than the width of a bag formed with the fastener assembly thereon.
Such small length fasteners allow liquids, powders, and other small
granular materials to be poured from the bag through the fastener
assembly.
[0018] A good use for the bags of the invention when the ends of
the fastener assembly are not sealed to front wall of the bag is to
store non-perishable items such as ice glazed food products that
are not susceptible to freezer burn since air and moisture is able
to enter the bag around the ends of the fastener assembly after the
front wall of the bag has been penetrated to gain access to the
fastener assembly or even before the bag wall has been penetrated
such as when a line of perforations is utilized for allowing easy
access to the fastener assembly.
[0019] In accordance with the first, second and third embodiment of
the present invention there is provided a method for making
recloseable bags on a bag making machine where the recloseable
fastener strips are independently attached to the same side of the
bag film preferably transversely to the longitudinal forming axis
in-line with the bag making machine, a unique two-piece
interlocking fastener assembly that minimizes the size of the
opening at the fastener strip ends, film having a plurality of the
unique recloseable fasteners each with two interlocking profile
strips attached thereon, and an apparatus for attaching the unique
fastener assembly to a sheet of film including a mechanism for
supplying a continuous film of flexible bag material and a
mechanism for feeding preferably the coiled recloseable profile
strip material preferably transversely across the bag material
film, and a mechanism for positioning, cutting, and attaching
enough of the recloseable profile strip material to form a
preferably transversely positioned recloseable fastener for a
single bag during each cycle of the apparatus, the recloseable
fasteners each being spaced a single bag length apart and each
profile strip of each recloseable fastener being maintained in the
interlocked position and being independently connected to the same
side of the film that forms one panel of the resulting bag. The bag
material can be wound into a roll in the folded or unfolded state
or fed directly into a conventional form, fill, and seal machine
that is in-line with the apparatus for positioning and attaching
the recloseable fastener strip material to the bag material
web.
[0020] In accordance with a fourth embodiment of the present
invention there is provided a chain of coilable interconnected
recloseable bags and a method for making the same. A chain of bags
are interconnected by a series of preferably transverse cross-seals
including a plurality of spaced tearlines between adjacent bags.
Each bag of the coilable chain includes preferably a transversely
positioned recloseable fastener secured to the outer or inner
surface of material that forms its front wall. The present
invention allows a single bag to be easily torn away from the chain
of bags.
[0021] The method of making the chain of coilable recloseable bags
includes supplying a continuous film of plastic web material and
moving said film forward in a bag forming direction. A plurality of
recloseable fasteners are secured to the surface of the web
material, that forms the front wall of each bag, preferably
transversely across the web. The web is drawn forward bringing the
inside surface of said web material that forms the front wall of
each bag next to the surface of a web material that forms the back
wall of each bag. The longitudinal edges of the web materials that
form the front and back wall of each bag are sealed together to
form a tube of plastic web material.
[0022] The front wall and back wall of the tube are cross-sealed to
each other to form the top and bottom end of each bag. A tearline
is cut in the tube between the seals of each bag and the chain of
bags are coiled into a roll. The method can include the application
of a twin seal with a tearline between them thereby creating a
closed top end and a closed bottom end on each bag or a single seal
and tearline can be applied which creates an open end and a closed
end on each bag. The method of the present invention also includes
a rupturable line of weakness applied to the front wall of each bag
adjacent to the recloseable fastener for entering the bag. The
recloseable bags on a roll can be conveniently used by the
customer. The recloseable bags of the present invention also have
the unique property of being less likely to leak when the bag is
placed on its back wall with the recloseable fastener facing
up.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] FIG. 1 is a front elevational view of the bag of the first
embodiment of the present invention;
[0024] FIG. 2 is a partly cut-away, side elevational view of the
bag shown in FIG. 1;
[0025] FIG. 3 is a cross-sectional view of the bag of FIG. 1 taken
along lines 3-3 of FIG. 1;
[0026] FIG. 4 is a perspective view of a roll of film of the first
embodiment of the present invention having a plurality of
recloseable fasteners connected thereto;
[0027] FIG. 5 is a partly cut-away, partly cross-sectional,
detailed perspective view of the recloseable fastener connected to
the bag of the first embodiment of the present invention;
[0028] FIG. 6A is perspective view of the bag of the second
embodiment of the present invention including a pull-out plug for
easy opening;
[0029] FIG. 6B is a cross-sectional view of the bag of FIG. 6A
taken along lines 6B-6B of FIG. 6A;
[0030] FIG. 6C is a perspective view of the film of the second
embodiment of the invention wound into a coil without a supporting
core;
[0031] FIG. 6D is a perspective view of the film of the second
embodiment of the invention staggered into a fan-folded stack;
[0032] FIG. 6E is a perspective view of an apparatus for connecting
the recloseable fasteners of the invention to a sheet of film;
[0033] FIG. 6F is a cross-sectional view taken along line 6F-6F of
FIG. 6E showing the fastener attaching device heat sealing the
fastener to the film of the present invention;
[0034] FIG. 7A is a perspective view of the roll of film of the
third embodiment of the present invention having a plurality of
recloseable fasteners connected onto a folded web;
[0035] FIG. 7B is a perspective view of a bag made from the film of
FIG. 7A;
[0036] FIG. 7C is a partly cut-away, partly cross-sectional
detailed perspective view taken along lines 7C-7C of FIG. 7A of a
recloseable fastener of the invention connected to the film of the
invention;
[0037] FIG. 8A is a side view of the bags of the fourth embodiment
of the present invention;
[0038] FIG. 8B is a cross-sectional view of the bag of FIG. 8A
taken along lines 8B-8B of FIG. 8A;
[0039] FIG. 8C is a web material flow diagram showing the method of
the fourth embodiment of the present invention of converting the
extruded film into recloseable bags on a roll;
[0040] FIG. 8D is a perspective view of the front wall web material
of the fourth embodiment wound into a coil; and
[0041] FIG. 8E is a perspective view of the front wall web material
of the fourth embodiment of the invention staggered into a
fan-folded stack.
DETAILED DESCRIPTION OF THE INVENTION
[0042] Referring now to the drawings, in FIGS. 1 and 2 is shown the
recloseable bag of the invention generally indicated by the numeral
10. Bag 10 has a top end generally indicated by the numeral 12 and
a bottom end generally indicated by the numeral 14. Bag 10 has a
front wall 16 and a back wall 18.
[0043] Bag 10 has a seal 20 at the top end 12 at which the front
wall 16 is joined to the back wall 18, and a seal 22 at the bottom
end at which the front wall 16 is joined to the back wall 18.
Located on the back wall 18 is a seam generally indicated by the
numeral 24.
[0044] As best can be seen in FIG. 5, connected to front wall 16 is
a recloseable fastener assembly generally indicated by the numeral
26 having two opposite ends 26a and 26b. Recloseable fastener
assembly 26 includes two profile strips generally indicated by the
numerals 28 and 30 which are shown in the drawings to be
interlocked. Profile strip 28 contains a groove 32 and profile
strip 30 contains a protuberance 34 which is lockingly received in
the groove 32.
[0045] Each end 26a and 26b of recloseable fastener assembly 26 is
preferably sealed in any conventional manner such as heat sealing
to the inside of front wall 16 to prevent air or liquids from
entering or leaving bag 10 through the ends 26a and 26b of
recloseable fastener assembly 26 after the front wall 16 has been
opened by the user of the bag 10 to gain access to recloseable
fastener assembly 26. However, if desired, the ends 26a and 26b
need not be sealed to the inside of front wall 16, and after
opening front wall 16, air or liquids can enter or leave bag 10
through the ends 26a and 26b of bag 10 and through the opening in
front wall 16.
[0046] The bag 10 is air tight prior to opening the front wall 16
to gain access to recloseable fastener assembly 26. Therefore,
products can be vacuum packed in bag 10.
[0047] Groove 32 is formed in groove body 36, and groove body 36 is
connected to groove body arm 38. A portion of groove body arm 38 is
connected to the inside of front wall 16 at seal 40. Groove body
arm 38 could be made separately from groove body 36 and attached to
groove body 36 in any conventional manner such as heat sealing.
[0048] Protuberance 34 is integrally connected to protuberance body
42, and protuberance body 42 is integrally connected to
protuberance body leg 44. A portion of protuberance body leg 44 is
connected to the inside of front wall 16 at seal 46. Protuberance
body leg 44 could be made separately from protuberance body 42 and
attached to protuberance body 42 in any conventional manner such as
heat sealing.
[0049] A string 48 for tearing a portion of front wall 16 to expose
and provide access to recloseable fastener 26 is located adjacent
to the inside of front wall 16 and seal 40. String 48 has an
exposed end 50 connected to pull tab 52 for grasping by the
customer and pulling to tear a portion of the front wall 16
covering recloseable fastener 26. If desired, string 48 could be
replaced with a plurality of perforations in front wall 16 between
seal 40 and protuberance body 42. If desired, string 48 and the
plurality of perforations in front wall 16 could be omitted from
bag 10, and the portion of front wall 16 between seal 40 and
protuberance body 42 could be opened with a sharp object such as
knife or scissors.
[0050] A roll of film 54 on a paper core 54a placed on an axle or
roller 56 containing the recloseable fastener 26 is shown in FIG.
4. Film roll 54 can be prepared by connecting recloseable fastener
26 to a flat sheet of film 55 at seal 40 and 46. String 48 of
recloseable fastener 26 may be connected to recloseable fastener 26
prior to attaching recloseable fastener 26 to film 55. If desired,
film 55 may be perforated to allow string 48 to extend
therethrough. Also, as stated above, string 48 could be eliminated
and replaced with a plurality of perforations on front wall 16 to
permit access to recloseable fastener 26 by tearing along the
plurality of perforations. If desired, recloseable fastener 26
could be attached to film 55 parallel to the edge 55a of film 55,
i.e., rotated 90 degrees from the orientation shown in FIG. 4 where
recloseable fastener is shown in the preferred orientation
perpendicular to the parallel edges 55a of film 55.
[0051] To make the bag 10 of the invention from the roll of film
54, each side 56 and 58 of the film 54 is folded together as shown
in FIG. 1 to overlap and form seal 24. The combined length of sides
56 and 58 must be greater than the length of recloseable fastener
26 to enable seal 24 to be formed. Top seal 20 and bottom seal 22
can then be made simultaneously or in any desired order. For
example, bottom seal 22 could be made first, the bag could then be
filled with a product such as a food item or the like, and then the
top seal 20 could be made. The roll of film 54 could be used on a
conventional form, fill, and seal machine. Such machines are well
known in the art. U.S. Pat. No. 4,617,683 shows a typical form,
fill, and seal operation with the exception that a recloseable
fastener is added, and U.S. Pat. No. 4,617,683 is hereby
incorporated by reference.
[0052] Any conventional bag making film known in the art may be
utilized as the film stock to make bag 10. The seals of the
invention are preferably made by heat sealing as is well known in
the art. Such bag film is commonly referred to as plastic film, and
is commonly made from polymeric materials.
[0053] Referring now to FIGS. 6A and 6B is shown the recloseable
bag of the second embodiment of the invention generally indicated
by the numeral 110. Bag 110 has a top end generally indicated by
the numeral 112 and a bottom end generally indicated by the numeral
114. Bag 110 has a front wall 116 and a back wall 118.
[0054] Bag 110 has a generally horizontal seal 120 at the top end
112 at which the front wall 116 is joined to the back wall 118, and
a seal 122 generally parallel to seal 120 at the bottom end at
which the front wall 116 is joined to the back wall 118. Located on
the back wall 118 is a seam generally indicated by the numeral 124
which is generally perpendicular to seal 120 and 122.
[0055] As can best be seen in FIG. 6A, connected to front wall 116
is a recloseable fastener assembly generally indicated by the
numeral 126 having two opposite ends 126a and 126b. Recloseable
fastener assembly 126 includes two fastener profile strips
generally indicated by the numerals 128 and 130 which are shown in
the drawings to be interlocked. Fastener profile strip 128 contains
a groove 132 and fastener profile strip 130 contains a protuberance
134 which is lockingly received in the groove 132.
[0056] Groove 132 is formed into groove body 136, and groove body
136 is connected to groove body arm 138. A portion of groove body
arm 138 is connected by heat-sealing or welding to the inside of
front wall 116 at seal 140. As shown in FIG. 6A and FIG. 6B groove
body 136 is connected to a groove body leg 139. A portion of groove
body leg 139 may be connected to the inside of front wall 116 at
peelable seal 141.
[0057] Peelable seals such as peelable seal 141 are well known in
the art and are disclosed in U.S. Pat. No. 5,050,736, which is
hereby incorporated by reference. Peelable seals such as peelable
seal 141 are made to peel open easily using minimal opening forces
by utilizing low sealing temperatures, reduced dwell time, and
light pressures. Peelable seals can also be produced by utilizing a
single polymer or from a combination of polymers that molecularly
produce low seal strengths.
[0058] As can best be seen in FIG. 6B, protuberance 134 is
preferably integrally connected to protuberance body 142. A portion
of protuberance body 142 is connected by heat-sealing or welding to
the inside of front wall 116 at seal 146.
[0059] As can be seen in FIG. 6A, an easy opening pull-out plug 150
is located on bag 110 and is defined by a plurality of perforations
150a in front wall 116 between seal 140 and seal 146. Pull-out plug
150 may be torn or pulled-out as indicated by the arrow in FIG. 6
to expose and provide access to recloseable fastener 126. Pull-out
plug 150 is similar to the pull-out plug disclosed in U.S. Pat. No.
3,266,965, which is hereby incorporated by reference. Pull-out plug
150 has an exposed tab or end 153 connected to pull-out plug 150
for grasping by the customer and pulling in the direction indicated
by the arrow in FIG. 6A to remove pull-out plug 150 and provide an
opening 153a in the front wall 116 covering recloseable fastener
126. If desired, pull-out plug 150 could be replaced with a single
line of perforations or line of weakness such as is disclosed in
U.S. Pat. No. 4,401,213, which is hereby incorporated by reference.
If desired, easy opening pull-out plug 150 and perforations 150a in
front wall 116 could be emitted from bag 110, and the portion of
front wall 116 between seal 140 and seal 146 could be a continuous
sheet of film which could be opened with a sharp instrument such as
knife or scissors. Bag 110 would be well suited for packaging
perishable items such as cereal and the like since peelable seal
141 would prevent the passage of air and moisture into the bag
through recloseable fastener assembly 126 when bag 110 includes an
easy opening feature such as pull-out plug 150 that requires
perforations to be cut through front wall 116 of bag 110.
[0060] Thus, to open a bag 110 that has been filled with a desired
product such as rice, cereal, meat, or the like, pull-out plug 150
is torn or pulled out as explained above to expose and provide
access to recloseable fastener 126 through opening 153a. Profile
strip 130 is then pulled away from profile strip 128, forcing
peelable seal 141 away from sealing contact with the inside of
front wall 116. The interior of bag 110 may then be accessed
through opening 153a, between profile strips 128 and 130, and
between front wall 116 and peelable seal 141. As mentioned above,
pull-out plug 150 could be replaced with a line of perforations or
line of weakness or a continuous sheet of film, and recloseable
fastener assembly 126 would be accessed by tearing the line of
perforations or weakness, or opening the sheet of film with a knife
or scissors.
[0061] Each end 126a and 126b of recloseable fastener assembly 126
is preferably sealed at seams 126c and 126d in any conventional
manner such as heat sealing to the inside of front wall 116 to
prevent air or liquids from entering or leaving bag 110 through the
openings 125a and 125b at ends 126a and 126b of recloseable
fastener assembly 126 after the front wall 116 has been penetrated
by the user of the bag 110 to gain access to recloseable fastener
assembly 126. However, if desired, the openings 125a and 125b at
ends 126a and 126b need not be sealed to the inside of front wall
116, and after penetrating front wall 116, air or liquids can enter
or leave bag 110 through the openings 125a and 125b at ends 126a
and 126b of bag 110 and through the penetrations in front wall
116.
[0062] Groove body arm 138 and groove body leg 139 could be an
integral part of groove body 136 or as shown in 6B could be made
separately from groove body 136 and attached to groove body 136
during a separate operation in any conventional manner such as heat
sealing. Groove body arm 138 and groove body leg 139 could be
opaque in color for optically identifying where one bag should end
and another bag begins without having to print some type of colored
identifier on the film at each bag location.
[0063] To make the bag 110 as shown in FIG. 6A of the invention
from the coil of film 60 as shown in FIG. 6C, each side 156 and 158
of the film 155 is folded together as shown in FIG. 6A to overlap
and form seal 124. The combined length of sides 156 and 158 must be
greater than the length of recloseable fastener 126 to enable seal
124 to be formed. Top seal 120 and bottom seal 122 can then be made
simultaneously or in any desired order. For example, bottom seal
122 could be made first, the bag could then be filled with a
product such as a food item or the like, and then the top seal 120
could be made. The coil of film 40 could be used on a conventional
form, fill, and seal machine. Such machines are well known in the
art.
[0064] As shown in FIG. 6C film 155 could also be wound after a
plurality of recloseable fastener assemblies 126 have been attached
along with a plurality of perforations, lines of weakness, or
pull-out plugs into a coreless coil 60 or as shown in FIG. 6D film
155 could be formed into a fan folded stack 65 in a zig-zag
fashion. Film 155 could be folded after a plurality of recloseable
fasteners 126 have been attached along with a plurality of
perforations, lines of weakness, or pull-out plugs 150 prior to
being formed into a coil 60 or into a fan-folded stack 65.
[0065] As shown in FIG. 6E an apparatus 170 for making zippered
film includes an unwinding device 175 for feeding a continuous
supply of bag film 155 forwardly while attaching a plurality of
two-piece recloseable fastener assemblies such as fastener assembly
126 to the inner surface of the film 155 that forms the inside of
each resulting bag 110. The fastener assemblies 126 are fed
laterally across the upper surface of the film 155 at right angles
to the machine direction, that is, transversely to the longitudinal
forming axis of the film. The fastener material 126 is supplied
from a spool 171 fed through a guide slot 172 up to a stop plate
173. Stop plate 173 has a tab 173a connected thereto which is force
fitted in slot 172a in the top of guide slot 172 enabling the
location of stop plate 173 within guide slot 172 to be varied as
desired for different fastener assembly lengths. A cut-off device
177 cuts a length of fastener material 126. Cut-off device 177 is
similar to apparatus that are shown in U.S. Pat. No. 4,909,017 and
U.S. Pat. No. 4,617,683. U.S. Pat. No. 4,909,017 is hereby
incorporated by reference.
[0066] As can best be seen in FIG. 6F, both groove body 136 and
protuberance body 142 of each recloseable fastener assembly 126 are
independently connected to the film by a mechanism which includes
an attaching device 179 such as that shown in U.S. Pat. No.
4,909,017 that preferably utilizes heat sealing technology. Device
179 includes a first platen 179a that is heated and an second
platen 179b that could also be heated. First and second platens
179a and 179b have a device for moving the two platens together and
apart such as cylinders 178a and 178b that are shown in FIG. 6E.
First platen 179b includes guide slot 172 which extends from one
end of platen 179b to the other end of platen 179b for positioning
the fastener assembly 126 accurately while sealing fastener
assembly 126 to film 155 to create roll of film 154. Each fastener
assembly 126 is connected to the film 155 in a location that is
preferably a single bag's length away from the previous fastener
assembly 126.
[0067] As shown in FIG. 6E a punching mechanism 180 for providing
an easy bag opening feature such as a line of perforations, or a
pull-plug 150 on film 155 could be added to the apparatus for
making roll of film 154. The punching mechanism 180 could consist
of a single serrated blade to produce a single line of perforations
in film 155 with each stroke of the mechanism 180 or as shown a
serrated elongated shaped rectangular blade 181 with circular ends
could be utilized to produce pull-out plug 150 in film 155 with
each stroke of the mechanism 180.
[0068] Any device known in the art for providing easy opening
features could be utilized. The location of the mechanism 180 for
providing easy opening could be incorporated into the apparatus 170
for making roll of film 154 anywhere desirable, but the mechanism
180 would preferably be located in a place whereby the easy opening
feature would be provided in or on the film 155 immediately prior
to the attaching of recloseable fastener assembly 126 onto film
155.
[0069] The apparatus 170 for making rolls of film 154 includes a
rewinding device 182 for winding film 155 into a roll on a
supporting core 154a or into coil 60 without supporting core
material as shown in FIG. 6C. The rewinding device 182 could be
replaced by a device capable of forming film 155 into a fan folded
stack 65 in a zig-zag fashion as shown in FIG. 6D.
[0070] The apparatus for making zippered film could be connected to
a form, fill, and seal machine, that is, provided in-line or part
of the form, fill, and seal machine. As a result the method for
making bag 110 would not require that film 155 be formed into a
roll of film 154 since the film 155 would be fed directly into the
form, fill, and seal machine. The device 182 for rewinding the film
into roll 154 would not be a required part of the apparatus for
making zippered film when the in-line method is used. As a result
of not having to wind film 155 into a roll 154, film 155 could have
the fastener assemblies 126 attached by apparatus 170 parallel to
the longitudinal forming axis of film 155 as shown in FIG. 8D
rather than transversely to the longitudinal forming axis.
[0071] Any conventional bag making film known in the art may be
utilized as a film stock to make bag 110. The seals of the
invention are preferably made by heat sealing as, is well known in
the art. Such bag film is commonly referred to as plastic film, and
is commonly made from polymeric materials.
[0072] In FIGS. 7A and 7B is shown an alternate embodiment of
recloseable fastener assembly 126 generally indicated by the
numeral 1266 connected to a sheet of film 1155. A roll of folded
film 1154 on a paper core 1154a containing the pre-applied
recloseable fastener assembly 1266 is shown in FIG. 7A. As can best
be seen in FIG. 7A film roll 1154 can be prepared by connecting
recloseable fastener assembly 1266 to a flat sheet of film 1155 at
seal 1400 and seal 1466. A single line of perforations or line of
weakness 1155b is provided in film 1155, such as those disclosed in
U.S. Pat. No. 4,401,213, to provide access through film 1155 when
recloseable fastener assembly 1266 is opened. After a plurality of
recloseable fastener assemblies 1266 are connected to film 1155 and
a single line of perforations or line of weakness 1155b are
provided in film 1155, film 1155 is folded and wound on a paper
core 1154a as shown in FIG. 7A. If desired, a pull-out plug 150
described above could be substituted for the single line of
perforations or line of weakness 1155b in film 1155. In FIG. 7A a
folded web of bag film is shown with one side longer than the other
creating a lip 1155a which is commonly referred to in the art as
J-sheeting. J-sheeting with the recloseable fastener assemblies
1266 pre-applied as shown in FIG. 7A can be formed into recloseable
bags by many different bag machine types known in the art such as
side-weld bag machines that are used to manufacture many different
bag types such as bread bags.
[0073] As can best be seen in FIG. 7C recloseable fastener assembly
1266 has groove body 1366 with groove body arm 1388 connected at
the locking side 1366a of groove body 1366 so as to minimize the
size of opening 1255a at fastener end 1266a and opening 1255b at
fastener end 1266b. An arm such as 1388 is connected at the locking
side of either profile strip 1366 perpendicular to the direction
the protuberance 1344 of the protuberance body 1424 is lockingly
received by the groove 1322 of the groove body 1366. If desired,
profile strip 1366 could be interchanged with profile strip 1422
and arm 1388 could be attached to profile strip 1422 in the same
manner in which arm 1388 is shown attached to profile strip 1366,
and profile strip 1366 would be connected to the inside of film
1155 by heat-sealing or welding as was profile strip 1422. The
profile strip including the arm 1388 of fastener 1266 needs to be
the one of the two profile strips farthest from the film 1155 to
which fastener assembly 1266 is connected. By reducing the size of
openings 1255a and 1255b at fastener ends 1266a and 1266b, the flow
of air and liquids can be minimized through the ends 1266a and
1266b.
[0074] Shown in FIG. 7B is a third embodiment of the present
invention generally indicated by the numeral 1010 being formed from
J-sheeted film 1155. Recloseable bag 1010 has a front wall 1012 and
a rear wall 1014 which are made from a single, integral piece of
plastic film. Front wall 1012 is joined to rear wall 1014 by side
seams 1016 and 1018 and by bottom fold 1020. Front wall 1012 has a
top edge 1012b which is not connected to rear wall 1014, and rear
wall 1014 has a top edge 1014b which is not connected to front wall
1012. Top edge 1014b is located at a distance above top edge 1012b
to form lip 1155a. Thus a mouth 1022 is formed in the top of bag
1010. Goods such as poultry, beef, or any other product to be
stored in bag 1010 could be inserted into bag 1010 through mouth
1022. As shown in FIG. 7B bag 1010 includes a seam 1025 sealing off
mouth 1022. Seam 1025 is normally created after bag 1010 has been
filled with the goods to be stored in bag 1010. Bag 1010 has a
recloseable fastener assembly 1266 connected to the inside of front
wall 1012 at seal 1400 and seal 1466. Recloseable fastener assembly
1266 is positioned transversely to the longitudinal forming axis of
film 1155 that forms bag 1010. Bags such as bag 1010 are commonly
referred to in the art as side seal or side weld bags and are
usually sold to product packers as finished bags that are often
hand loaded before being sealed shut. A good use for recloseable
bag 1010 would be to package bakery items such as tortillas.
[0075] Recloseable bag 1010 could be formed from J-sheeted film
1155 which includes recloseable fastener assemblies 1266 that have
been attached by a machine, such as apparatus 170 shown in FIG. 6E,
that is in-line with the bag forming process and therefore film
1155 would not need to be wound into roll 1154. As a result of
having never to be wound into a roll 1154, as shown in FIG. 8D film
1155 could have the recloseable fastener assemblies 1266 positioned
parallel to the longitudinal forming axis of film 1155 rather than
positioned transversely to the longitudinal forming axis.
[0076] Referring now to FIGS. 8A and 8B is the fourth embodiment of
the present invention showing a collapsed tubular web generally
indicated by numeral 218 of plastic having a front wall 211 and a
rear wall 212. The tubular web 218 includes a plurality of
identical interconnected recloseable bags 210. Each bag 210 has a
top end 223 and a bottom end 224. Each bag 210 has a front wall 211
and a back wall 212.
[0077] Each bag 210 has a seal 220a at the top end 223 and a seal
220b at the bottom end 224 at which the front wall 211 is joined to
the back wall 212. Each bag 210 has side edge seals 221a and 221b
at which the front wall 211 is joined to the back wall 212.
[0078] As can best be seen in FIG. 8B, connected to front wall 211
is a recloseable fastener generally indicated by the numeral 213.
Recloseable fastener 213 includes two interlocking profile strips
generally indicated by the numerals 214 and 215 which are shown in
the drawings to be interlocked. Profile strip 214 contains a groove
225 and profile strip 215 contains a protuberance 226 that is
lockingly received in the groove 225.
[0079] A flange 216 is connected to the outside of profile strip
214. Flange 216 is connected to front panel 211 along flange edge
219. A rupturable perforation line 217 in front wall 211 provides a
tear line for tearing open to enter bag 210 once the recloseable
fastener 213 is opened. Each end 216a and 216b of flange 216 is
preferably secured to front wall 211 in any conventional manner
such as heat sealing to the front wall 211 to prevent air or
liquids from entering or leaving through flange ends 216a and 216b.
However, if desired, the flange ends 216a and 216b need not be
sealed to the front wall 211 so air and liquids can enter or leave
bag 210 through the flange ends 216a and 216b.
[0080] The flange 216 could be integrally connected to the profile
strip 214 or as shown in FIG. 8B the flange 216 could be made
separately from profile strip 214 and attached to flange 216 in any
conventional manner such as heat sealing.
[0081] Recloseable fastener 213 with attached flange 216 could be
replaced with any of the previously described fastener arrangements
such as shown in FIG. 5 which includes a groove body arm 38 and a
groove body leg 44 for use in attaching recloseable fastener
assembly 26 to the inside of the wall that forms the front panel of
the bag instead of attaching fastener assembly 26 to the outside of
the wall of the front panel of the bag as shown in FIGS. 8A and 8B.
Recloseable bags such as bag 210 could be used as freezer storage
bags and would be very conveniently dispensed from a roll or coil
rather than individual bags that are loosely packed.
[0082] The collapsed tubular web 218 or recloseable bags 210 is
formed by connecting a plurality of bags 210 together by
perforation lines 222 extending across the tube 218 transversely to
the side edge seams 221a and 221b and between the top end seals
220a and bottom end seals 220b of two adjacent bags 210.
[0083] The preferred method of producing the collapsed tubular web
of recloseable bags of the present invention according to FIG. 8C
requires a plastic film be blown into a tube 251 on a conventional
blown film tube extrusion machine 250. Such machines are well known
in the art. U.S. Pat. No. 3,543,343 shows a typical blown film tube
extrusion machine with the exception that a recloseable fastener is
added, and U.S. Pat. No. 3,543,343 is hereby incorporated by
reference. The tube 251 is collapsed and both side edges are slit
open creating two separate webs of material 211 and 212. After
passing over several idler rolls such as 252a and 252b, the two
webs of material 211 and 212 are forced to follow two different web
paths. Web material 211 that forms the front wall travels through a
sealing device 256 where a series of spaced recloseable fasteners
213 are transversely secured to the underside of the web material
211, a bag's length apart, by preferably heat sealing. Recloseable
fasteners 213 are preferably only slightly shorter than the width
of web material 211. Such sealing devices are well known in the
art. U.S. Pat. No. 4,909,017 shows such a device. Rupturable
perforation lines 217 are cut in front wall 211 adjacently below
the recloseable fastener 213 by sealing device 256. A serrated
knife 257 required to produce the perforation line 217 is
incorporated into the typical sealing device 256.
[0084] Back wall web material 212 is diverted around sealing device
256 by passing over preferably at least one additional idler roll
253. At nip section 258 the web materials that form the front wall
211 and the back wall 212 are rejoined by passing through two
preferably driven nip rolls 258a and 258b where they are secured
together by continues seams along the longitudinal edges 224a and
224b of front wall 211 and the longitudinal edges 224c and 224d of
back wall 212 by any conventional method such as heat sealing."
[0085] The web materials that form front wall 211 and the rear wall
212 with their peripheral edges 224a, 224b 224c, and 224d, sealed
together reform a tube 218 with a plurality of spaced recloseable
fasteners 213 and perforation lines 217 transversely secured a
bag's length apart along the length of tube 218.
[0086] The tube 218 passes through a cutting cross-sealing device
260 that applies one bag stop end seal 220a and the adjacent bags
bottom end seal 220b simultaneously while cutting the perforation
line 222 extending transversely across the tube 218 and between the
top end seals 220a and bottom end seal 220b. Such cutting sealing
devices are well known in the art. U.S. Pat. No. 4,449,962 shows a
typical cutting sealing device with the exception that a straight
cut is included for making separated bags. While the present
invention could also produce separated bags the preferred
embodiment is bags connected to one another by the perforation
lines 222 between adjacent bags. The device of U.S. Pat. No.
4,449,962 could accomplish this by utilizing a serrated knife, and
U.S. Pat. No. 4,449,962 is hereby incorporated by reference.
[0087] The tube 218 has been converted, as described above, into a
series of recloseable bags 210 connected together making it
possible to wind them into roll 262 by any conventional winding
machine 263. The recloseable bags 210 can be wound onto any
preferred core material 264 such as a paper tube or can be would
into roll 262 without any supporting core material 264. Roll 262
can be produced with any desired number of recloseable bags 10
making up the roll 262.
[0088] As shown in FIG. 8D front wall web material 211 could be
wound after a plurality of recloseable fasteners 213 have been
attached along with a plurality of rupturable perforation lines 217
into a coil 270 or as shown in FIG. 8E, front wall web material 211
could be formed into a fan folded stack 275 in a zig-zag fashion.
If desired, a plurality of recloseable fasteners shown in phantom
lines generally indicated by the numeral 213a could be positioned
on film 211 in a direction parallel to the longitudinal forming
axis. Front wall web material 211 could also be wound into a roll
on a supporting core material such as was shown in the third
embodiment of the present invention. Front wall web material 211 in
the roll, coiled, or fan folded state could be formed into
recloseable bags during packaging operations where product is being
sandwiched between front web material 211 and another web such as
back wall web material 212 resulting in a bag such as recloseable
bag 210 that contains product within. The packaging of products as
previously described is well known in the art and a specific
product that could utilize a recloseable bag formed as described
would be sliced bacon. Any conventional bag making film known in
the art may be utilized as the film stock to make bag 210. Such bag
film is commonly referred to as plastic film, and is commonly made
from polymeric or polyolefin materials such as polyethylene. The
seals and seams of the invention are preferably made by heat
sealing but any other well known methods of securing polymeric
materials together such as applying adhesives could also be
utilized.
[0089] Although the preferred embodiments of the invention have
been described in detail above, it should be understood that the
invention is in no sense limited thereby. Other variations are
possible. For example referring to the fourth embodiment, a single
web of material could be unwound from a roll and folded, out of
line with blown film tube extrusion machine 250, after the
recloseable fasteners 213 have been attached and the perforated bag
openings 217 have been applied. Then the side opposite the fold
could be sealed closed and the remaining steps of the method of
making recloseable bags on a roll according to the present
invention would follow as previously described above. Also a device
for staggering the bags could replace the winder so as to fan fold
stack the interconnected bags into a container in a zigzag fashion
versus winding them into a roll. Furthermore, the top end 223 of
each bag 210 could be unsealed so the series of bags could be
dispensed from the roll with one end open, allowing product to be
loaded through the open end and later sealed shut by the user after
loading. The rupturable line of weakness 217 could also be
eliminated requiring the user to cut each bag open or a tear string
could be incorporated to assist in creating an opening adjacent the
recloseable profile strips 214 and 215 of each bag 210. In addition
the front wall 211 could be formed from a transparent flexible film
and the back wall 212 could be formed from a opaque flexible film.
As taught in the fourth embodiment, many other applications could
utilize a film with pre-applied recloseable fasteners that are
greater than half the width of the web each located a bag length
apart with each profile strip independently connected to the same
side of the film, such as, lidding films for vacuum formed trays or
lidding films covering forming webs used in vacuum packaging.
[0090] Many of the elements of the various embodiments of the
present invention could be interchanged with one another, e.g., the
recloseable fastener assembly of the second embodiment could be
substituted for the fastener assembly of the third embodiment and
vice versa. The fastener assemblies of the present invention could
not only be interchanged, but they could be positioned transversely
or parallel to the longitudinal forming axis of the zippered film
as shown in FIG. 8D. Therefore, many combinations and substitutions
are possible as is made apparent from the teachings of my
invention. Accordingly, the scope of my invention should be
determined not by the embodiments illustrated, but by the following
appended claims and their legal equivalents.
* * * * *