U.S. patent application number 11/648805 was filed with the patent office on 2007-05-24 for fastener bag and fastening device.
Invention is credited to Raizo Kuge, Sho Obara, Yuichi Oki.
Application Number | 20070116388 11/648805 |
Document ID | / |
Family ID | 38053620 |
Filed Date | 2007-05-24 |
United States Patent
Application |
20070116388 |
Kind Code |
A1 |
Kuge; Raizo ; et
al. |
May 24, 2007 |
Fastener bag and fastening device
Abstract
A fastener bag includes a packaging bag formed by heat-sealing
side parts of a packaging sheet in a butt seam, and a fastening
device attached to the inner surface of the packaging bag. The
fastening device includes a male fastening member and a female
fastening member. The male fastening member is disposed on one side
of the heat-sealed butt seam of the packaging bag, and the female
fastening member is disposed on the other side of the heat-sealed
butt seam of the packaging bag so as to be engage with the male
fastening member, and a tear-facilitating means is interposed
between the male and the female fastening member. The fastener bag
is capable of being opened and of being reclosed, and is suitable
for use on an automatic filling and packaging machine.
Inventors: |
Kuge; Raizo; (Hannou-Shi,
JP) ; Obara; Sho; (Koshigaya-Shi, JP) ; Oki;
Yuichi; (Tokyo-To, JP) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Family ID: |
38053620 |
Appl. No.: |
11/648805 |
Filed: |
January 3, 2007 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
10380677 |
Aug 4, 2003 |
|
|
|
11648805 |
Jan 3, 2007 |
|
|
|
Current U.S.
Class: |
383/203 ;
383/63 |
Current CPC
Class: |
B65D 75/66 20130101;
B65D 33/2583 20130101; B65D 33/2575 20130101; B65D 33/2533
20130101; B65D 33/2508 20130101 |
Class at
Publication: |
383/203 ;
383/063 |
International
Class: |
B65D 33/00 20060101
B65D033/00; B65D 33/16 20060101 B65D033/16 |
Claims
1. A fastener bag comprising: a packaging bag formed by
heat-sealing side parts of a packaging sheet in a butt seam; and a
fastening device attached to a part of the inner surface of the
packaging bag on one side of the heat-sealed butt seam; wherein the
fastening device includes separate male and female fastening
members, the male and the female fastening member are disposed with
a space therebetween so as to be engaged, and a tear-facilitating
means is interposed between the male and the female fastening
member.
2. The fastener bag according to claim 1, wherein the
tear-facilitating means is a narrow easy-to tear part formed in the
packaging bag.
Description
[0001] This application is a Divisional of co-pending application
Ser. No. 10/380,677 filed Aug. 4, 2003. The entire contents of all
are hereby incorporated by reference.
TECHNICAL FIELD
[0002] The present invention relates to a fastener bag capable of
being easily opened and reclosed, and of being applied to packaging
an article therein by an automatic filling and packaging machine,
and a fastening device.
BACKGROUND ART
[0003] Recently, most packaging bags are required to have both a
capability to be easily opened and a capability to be reclosed. The
field of automatic filling and packaging, in which operations for
filling and packaging an article in a packaging bag are carried out
simultaneously, requests a fastener bag having both a capability to
be opened and a capability to be reclosed.
[0004] A known fastener bag having both a capability to be opened
and a capability to be reclosed is made by superposing two
packaging sheets, heat-sealing peripheral parts of the superposed
packaging sheets, attaching the male fastening member of a
fastening device to the inner surface of one of the packaging
sheets, and attaching the female fastening member of the fastening
device to the inner surface of the other packaging sheet. The male
and the female fastening member are disengaged to open the fastener
bag, and are reengaged to close the fastener bag.
[0005] A known easy-to-open fastener bag is formed from a packaging
material having a property of facilitating opening the fastener
bag, another packaging bag is provided with a notch, and a third
known fastener bag is provided with a filament attached to its
component sheet.
[0006] Although the foregoing fastener bag has both a capability to
be opened easily and a capability to be reclosed, a bag making
process of making the fastener bag, a filling and packaging process
need complicated work because the fastener bag is made by
superposing the two packaging sheets and heat-sealing the
peripheral parts of the packaging sheets. Particularly, automatic
filling and packaging needs a complicated apparatus, requires
troublesome work, and have significant problems in practical
work.
[0007] The present invention has been made in view of the foregoing
problems and it is therefore an object of the present invention to
provide a fastener bag having both a capability to be opened easily
and a capability to be reclosed, and capable of being used for
automatic filling on an automatic filling and packaging machine,
and to provide a fastening device.
DISCLOSURE OF THE INVENTION
[0008] According to a first aspect of the present invention, a
fastener bag includes a packaging bag formed by heat-sealing side
parts of a packaging sheet in a butt seam; and a fastening device
attached to the inner surface of the packaging bag; wherein the
fastening device includes separate male and female fastening
members, the male fastening member is disposed on one side of the
heat-sealed butt seam of the packaging bag, the female fastening
member is disposed on the other side of the heat-sealed butt seam
of the packaging bag so as to be engage with the male fastening
member, and a tear-facilitating means is extended between the male
and the female fastening member.
[0009] According to a second aspect of the present invention, a
fastener bag includes a packaging bag formed by heat-sealing side
parts of a packaging sheet in a butt seam; and a fastening device
attached to a part of the inner surface of the packaging bag on one
side of the heat-sealed butt seam; wherein the fastening device
includes separate male and female fastening members, the male and
the female fastening member are disposed with a space therebetween
so as to be engaged, and a tear-facilitating means is interposed
between the male and the female fastening member.
[0010] According to a third aspect of the present invention, a
fastener bag includes a packaging bag formed by heat-sealing side
parts of a packaging sheet in a butt seam; and a fastening device
attached to the inner surface of the packaging bag; wherein the
fastening device is an integral molding including a male fastening
member, a female fastening member and a connecting member, and a
tear-facilitating means is combined with the connecting member.
[0011] According to a fourth aspect of the present invention, a
fastener bag includes a packaging bag formed by heat-sealing side
parts of a packaging sheet in an envelope seam; and a fastening
device attached to the inner surface of the packaging bag; wherein
the fastening device is an integral molding including a male
fastening member, a female fastening member and a connecting
member, and a tear-facilitating means is combined with the
connecting member.
[0012] According to a fifth aspect of the present invention, a
fastener bag includes a packaging bag formed by heat-sealing side
parts of a packaging sheet in a butt seam; and a fastening device
attached to the inner surface of the packaging bag; wherein the
fastening device includes separate male and female fastening
members, the male fastening member is disposed on one side of the
heat-sealed butt seam of the packaging bag, the female fastening
member is disposed on the other side of the heat-sealed butt seam
so as to engage with the male fastening member, and a cut tape is
extended from one to the other end of the packaging bag on a part
of the inner surface of the packaging bag between the male and the
female fastening member, and is attached to the inner surface of
the packaging bag.
[0013] According to a sixth aspect of the present invention, a
fastener bag includes a packaging bag formed by heat-sealing side
parts of a packaging sheet in a butt seam; and a fastening device
attached to a part of the inner surface of the packaging bag on one
side of the heat-sealed butt seam; wherein the fastening device
includes separate male and female fastening members, the male and
the female fastening member are disposed with a space therebetween
so as to be engaged, and a cut tape is extended from one to the
other end of the packaging bag on a part of the inner surface of
the packaging bag between the male and the female fastening member,
and is attached to the inner surface of the packaging bag.
[0014] According to a seventh aspect of the present invention, a
fastener bag includes a packaging bag formed by heat-sealing side
parts of a packaging sheet in an envelope seam; and a fastening
device attached to the inner surface of the packaging bag; wherein
the fastening device includes male and female fastening members,
the male fastening member is disposed on one side of the
heat-sealed envelope seam of the packaging bag, the female
fastening member is disposed on the other side of the heat-sealed
envelope seam of the packaging bag so as to be engaged with the
male fastening member, and a cut tape is extended from one to the
other end of the packaging bag on a part of the inner surface of
the packaging bag between the male and the female fastening member,
and is attached to the inner surface of the packaging bag.
[0015] According to an eighth aspect of the present invention, a
fastening device includes separate male and female fastening
members, wherein a linear member is combined with the male or the
female fastening member.
BRIEF DESCRIPTION OF THE DRAWINGS
[0016] FIG. 1 is a rear view of a fastener bag in a first
embodiment according to the present invention;
[0017] FIG. 2 is an enlarged sectional view of the fastener bag
shown in FIG. 1;
[0018] FIG. 3 is a rear view of a fastener bag in a second
embodiment according to the present invention;
[0019] FIG. 4 is an enlarged sectional view of the fastener bag
shown in FIG. 3;
[0020] FIG. 5 is an enlarged sectional view of a fastener bag in a
third embodiment according to the present invention;
[0021] FIG. 6 is an enlarged, sectional, perspective view of a
fastener bag in a fourth embodiment according to the present
invention;
[0022] FIG. 7 is an enlarged sectional view of a fastener bag in a
fifth embodiment according to the present invention;
[0023] FIG. 8 is an enlarged sectional view of a fastener bag in a
sixth embodiment according to the present invention;
[0024] FIG. 9 is an enlarged sectional view of a fastener bag in a
seventh embodiment according to the present invention;
[0025] FIG. 10 is an enlarged sectional view of a fastener bag in
an eighth embodiment according to the present invention;
[0026] FIG. 11 is a fragmentary sectional view of a cut tape;
[0027] FIG. 12 is an enlarged sectional view of a fastener bag in a
ninth embodiment according to the present invention; and
[0028] FIG. 13 is an enlarged sectional view of a fastener bag in a
tenth embodiment according to the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
[0029] Preferred embodiments of the present invention will be
described with reference to the accompanying drawings.
[0030] Referring to FIG. 1, a fastener bag 1 in a first embodiment
according to the present invention includes a packaging bag 2, and
a fastening device 3 welded or bonded to the inner surface of the
packaging bag 2.
[0031] As shown in FIGS. 1 and 2, the packaging bag 2 is formed by
folding side parts 4a and 4b of a rectangular packaging sheet,
joining the folded side parts 4a and 4b such that the inner
surfaces thereof are contiguous, heat-sealing the thus joined
folded side parts 4a and 4b to form a tubular structure having a
back sealed part 5, and heat-sealing the upper and the lower end of
the tubular structure to form an upper sealed part 6 and a lower
sealed part 7.
[0032] Although it is preferably that the packaging sheet is a
laminated film, the packaging sheet may be a single film.
[0033] Laminated films suitable as the packaging sheet for forming
a transparent packaging bag 2 are a laminated film formed by
laminating a 20 to 50 .mu.m thick biaxially oriented polypropylene
film, and a 20 to 60 .mu.m thick nonoriented polypropylene film by
a laminating process using a 2 to 3 .mu.m thick dry bonding layer,
a laminated film formed by laminating a 9 to 25 .mu.m thick
polyester film, and a 25 to 120 .mu.m thick straight-chain,
low-density polyethylene film by a laminating process using a 2 to
3 .mu.m thick dry bonding layer, and a laminated film formed by
laminating a 9 to 20 .mu.m thick biaxial oriented nylon film, and a
25 to 120 .mu.m thick polyethylene film by a laminating process
using a 2 to 3 .mu.m thick dry bonding layer. An extruded 12 to 20
.mu.m thick polyethylene layer may be used as a bonding layer
instead of the dry bonding layer.
[0034] Laminated films suitable as the packaging sheet for forming
an opaque packaging bag 2 are a laminated film formed by laminating
a 9 to 25 .mu.m thick polyester film, a 6 to 30 .mu.m thick
aluminum foil, and a 20 to 120 .mu.m thick straight-chain
low-density polyethylene film by a laminating process using a 2 to
3 .mu.m thick dry bonding layer, and a laminated film formed by
laminating a 9 to 25 .mu.m thick polyester film, a 12 .mu.m thick
aluminum-metallized polyester film, and a 20 to 60 .mu.m thick
nonoriented polypropylene film by a laminating process using a 2 to
3 .mu.m thick dry bonding layer. A 12 to 20 .mu.m thick extruded
polyethylene layer may be used as a bonding layer instead of the
dry bonding layer.
[0035] Referring to FIG. 2, the fastening device 3 includes a
separate male fastening member 8 and a separate female fastening
member 9. The male fastening member 8 has a base part 8a attached
to a part of the inner surface of the packaging bag 2 on one side
of the back sealed part 5. The female fastening member 9 has a base
part 9a attached to a part of the inner surface of the packaging
bag 2 on the other side of the back sealed part 5.
[0036] The male fastening member 8 and the female fastening member
9 are formed by extruding an olefin resin, such as a polyethylene,
a polypropylene or a copolymer of a polyethylene and a
polypropylene by an extrusion molding machine. Although the male
fastening member 8 and the female fastening member 9 shown in FIG.
2 have each a single engaging part, the same may be provided with
two or more engaging parts when necessary.
[0037] As shown in FIG. 2, the packaging bag 2 is provided with
narrow roughened tear parts 10 in the outer surface of the
laminated film forming the packaging bag 2. The narrow roughened
tear parts 10 are formed along the back sealed part 5. The
roughened tear parts 10 are those provided with scratches not
penetrating the laminated film formed by pressing a sand paper
against the laminated film. The roughened tear parts 10 are the
tear-facilitating means of the packaging bag.
[0038] When opening the fastener bag 1, one end of the back sealed
part 5 is held between fingers, the back sealed part 5 is pulled
away from the surface of the fastener bag 1 to tear the laminated
film along bends in the back sealed part provided with the
roughened tear parts 10.
[0039] A method of manufacturing the fastener bag will be
described.
[0040] A continuous laminated film is cut in a packaging sheet of a
length equal to twice the sum of the width of the packaging bag 2
shown in FIG. 1 and the length of the back sealed part 5 of the
packaging bag 2 to form the packaging bag 2 that can be used on an
automatic filling and packaging machine. When folding the packaging
sheet to form the packaging bag 2, at least one of the side parts
4a and 4b joined by heat-sealing to form the back sealed part 5 is
provided with the roughened tear part 10. Preferably, both the side
parts are provided with the roughened tear parts, respectively.
[0041] The side parts 4a and 4b are bent and are joined such that
the inner surfaces thereof are contiguous to form a tubular
structure. The roughened tear parts 10 formed in the packaging
sheet extend along the bends of the side parts 4a and 4b.
[0042] Then, a continuous fastening device 3 with the male
fastening member 8 and the female fastening member 9 engaged is
inserted in the tubular structure such that the base part 8a of the
male fastening member 8 is disposed on a part of the inner surface
of the tubular structure on one side of the joint of the side parts
4a and 4b, and the base part 9a of the female fastening member 9 of
the fastening device is disposed on a part of the inner surface of
the tubular structure on the other side of the joint of the side
parts 4a and 4b. Thus, the male fastening member 8 and the female
fastening member 9 are disposed on the opposite sides of the joint
of the side parts 4a and 4b, respectively.
[0043] Then, the joined side parts 4a and 4b of the tubular
structure are bonded together by heat-sealing and, at the same
time, the respective base parts 8a and 9a of the male fastening
member 8 and the female fastening member 9 are welded or bonded to
the inner surface of the tubular structure. Thus, the tubular
structure having open opposite ends and provided with the fastening
device 3 attached to its inner surface is formed.
[0044] Then, one end of the tubular structure fixedly provided with
the fastening device 3 and having the opposite open ends is
heat-sealed to form the lower heat-sealed part 7. Thus, the
packaging bag 2 having an open upper end is obtained. An article is
filled through the open upper end in the packaging bag 2, and then
the upper end of the packaging bag 2 is heat-sealed to form the
upper heat-sealed part 6. The packaging bag 2 filled with the
article is cut along the upper heat-sealed part 6 to separate the
packaging bag 2 from the packaging sheet.
[0045] FIGS. 3 and 4 show a fastener bag 1a in a second embodiment
according to the present invention. The fastener bag 1a shown in
FIGS. 3 and 4 differs from the fastener bag 1 shown in FIGS. 1 and
2 in that the fastener bag 1a is provided with a tear strip 11 as a
tear-facilitating means combined with a fastening device 3a instead
of the roughened tear parts 10 of the fastener bag 1 shown in FIGS.
1 and 2.
[0046] Referring to FIG. 4, the fastening device 3a includes a
separate male fastening member 8 and a separate female fastening
member 9. The tear strip 11 is attached temporarily to the inner
surface of the base part of the male fastening member 8 by welding
or bonding. The tear strip 11 may be attached temporarily to the
outer surface of the base part 8a of the male fastening member 8.
When the tear strip 11 is attached to the outer surface of the base
part 8a, the respective positions of the male fastening member 8
and the female fastening member 9 on a packaging bag 2 are
interchanged.
[0047] Although it is preferable that the tear strip 11 is made of
a polymer different from that forming the packaging sheet and is,
for example, a nylon monofilament or a metal wire, the tear strip
11 may be a cotton yarn or a silk yarn, provided that the tear
strip 11 has a strength sufficient to tear both the base part 8a of
the male fastening member 8 and the packaging sheet.
[0048] The male fastening member 8 and the female fastening member
9 of the fastening device 3a are formed by continuously extruding
an olefin resin by an extrusion molding machine. The tear strip 11
can be combined with the male fastening member 8 or the female
fastening member 9 by forming the tear strip 11 simultaneously with
the male fastening member 8 or the female fastening member 9 by
coextrusion.
[0049] As shown in FIG. 3, the fastening device 3a and the tear
strip 11 are extended continuously between the upper and the lower
end of the fastener bag 1a. A triangular pull tab 13 is formed by
cutting lines 12 in a lower heat-sealed part 7 at a position
corresponding to the tear strip 11 and an end of the tear strip 11
is connected to the pull tab 13.
[0050] When opening the fastener bag 1a, the lower heat-sealed part
7 is cut along the cutting lines 12 to separate the pull tab 13
from the lower heat-sealed part 7, and then the pull tab 13 is held
between fingers and is pulled away from the fastener bag 1a.
Consequently, the tear strip 11 connected to the pull tab 13 cuts
both the base part 8a of the male fastening member 8 and the
packaging sheet to open the fastener bag 1a.
[0051] Whereas the fastener bag 1a shown in FIG. 4 has the butt
seam type packaging bag 2a, a fastener bag 1b shown in FIG. 5 has
an envelope seam type packaging bag 2b.
[0052] The envelope seam type packaging bag 2b has an envelope seam
5a formed by superposing and joining together side parts of a
packaging sheet. Laminated films suitable as the packaging sheet
for forming the packaging bag 2b are a laminated film formed by
laminating a 20 to 60 .mu.m thick nonoriented polypropylene film, a
20 to 50 .mu.m thick biaxially oriented polypropylene film, and a
20 to 60 .mu.m thick nonoriented polypropylene film by a laminating
process using a 2 to 3 .mu.m thick dry bonding layer, a laminated
film formed by laminating a 30 to 50 .mu.m thick straight-chain
low-density polyethylene film, a 9 to 25 .mu.m thick polyester
film, and a 25 to 120 .mu.m thick straight-chain, low-density
polyethylene film by a laminating process using a 2 to 3 .mu.m
thick dry bonding layer, and a laminated film formed by laminating
a 25 to 60 .mu.m thick polyethylene film, a 9 to 20 .mu.m thick
biaxial oriented nylon film, and a 25 to 120 .mu.m thick
polyethylene film by a laminating process using a 2 to 3 .mu.m
thick dry bonding layer. An extruded polyethylene layer may be used
as a bonding layer instead of the dry bonding layer.
[0053] A fastening device 3c included in a fastener bag 1c shown in
FIG. 6 is different in construction from that included in the
fastener bag 1b shown in FIG. 5. The fastening device 1c shown in
FIG. 6 is a molding integrally having a male fastening member 8, a
female fastening member 9, and a connecting part 14 interconnecting
the male fastening member 8 and the female fastening member 9. A
tear strip 11, i.e., a tear-facilitating means, is attached to the
inner surface of the connecting part 14.
[0054] The fastening device 3c and the tear strip 11 of the
fastener bag 1c, similarly to the fastening device 3a and the tear
strip 11 shown in FIG. 2, are extended between the upper and the
lower end of a packaging bag 2, a triangular pull tab is formed by
cutting lines in a lower heat-sealed part and an end of the tear
strip 11 is connected to the pull tab.
[0055] A fastener bag 1d shown in FIG. 7 differs from the fastener
bag 1 shown in FIG. 2 in that a fastening device 3 is extended on
the inner surface of a packaging bag 2 along a butt seam 5 on one
side of the butt seam 5, a ridge 12 extending along the fastening
device 3 is formed in a part of the packaging bag 2 between a base
part 8a of a mal fastening member 8, and a base part 9a of a female
fastening member 9, and roughened tear parts 10a, i.e.,
tear-facilitating means, are formed at the root of the ridge
12.
[0056] A fastener bag 1e shown in FIG. 8 is not provided with any
part corresponding to the ridge 12 of the packaging bag 2 of the
fastener bag 1d shown in FIG. 7, and is provided with a fastening
device 3a instead of the fastening device 3. In the fastener bag 1e
shown in FIG. 8, a part of the packaging bag 2 between a base part
8a of a male fastening member 8, and a base part 9a of a female
fastening member 9 is cut with a tear strip 11. Although the
fastener bag 1e shown in FIG. 8 employs the tear strip 11 as a
cutting means for cutting the packaging bag 2, the tear strip 11
may be omitted, and a tape may be welded or bonded to a part of the
inner surface of the packaging bag 2 between the base part 8a of
the male fastening member, and the base part 9a of the female
fastening member 9 or a narrow roughened tear part may be formed
near the respective base parts 8a and 9a of the male fastening
member 8 and the female fastening member 9, and a cut tape or the
narrow roughened tear part may be torn to open the packaging bag
2.
[0057] The cut tape is formed from, for example, a laminated film
formed by sandwiching a 12 .mu.m thick polyester film between 30
.mu.m thick polyethylene films. The cut tape is formed in a width
slightly smaller than the distance between the respective base
parts 8a and 9a of the male fastening member 8 and the female
fastening member 9 so that the cut tape is guided by the base part
8a of the male fastening member 8 or the base part 9a of the female
fastening member 9 when cutting the packaging bag 2 with the cut
tape.
[0058] Whereas the fastener bag 1e shown in FIG. 8 has the butt
seam type packaging bag 2, a fastener bag 1f shown in FIG. 9 has an
envelope seam type packaging bag 2b.
[0059] A fastener bag 1g shown in FIG. 10 is provided with a cut
tape 100 as a tear-facilitating means instead of the roughened tear
part 10 of the fastener bag 1 shown in FIG. 2.
[0060] The cut tape 100 of the fastener bag 1g is attached to a
part of the inner surface of a packaging bag 2b between a base part
8a of a male fastening member 8 and a back sealed part 5 formed in
the packaging bag 2g. The cut tape 100 serves as a
tear-facilitating means for opening the packaging bag 2g. Two
longitudinal cutting lines may be formed in the cut tape 100, and a
part between the two cutting lines of the cut tape may be used as a
tear-facilitating means.
[0061] The cut tape 100 has a width in the range of 3 to 15 mm. The
cut tape 100 is extended continuously between an upper heat-sealed
part 6 and a lower heat-sealed part 7 of the packaging bag 1g on a
part of the packaging bag 2g between the male fastening member 8
and the female fastening member 9. A triangular pull tab is formed
in at least either the upper heat-sealed part 6 or the lower
heat-sealed part 7 by cutting lines. The cutting line separates a
part of the heat-sealed part to form the pull tab integrally with
the cut tape 100 at one end of the cut tape 100.
[0062] As shown in FIG. 11, the cut tape 100 is a three-layer
structure consisting of a straight-chain low-density polyethylene
layer 101, a polyester layer 102, and an easy-to-peel layer 103.
The easy-to-peel layer 103 is formed of a chlorinated polyethylene
or an EVA, or is a hot-melt layer. The easy-to-peel layer 103 has a
peeling strength on the order of 200 g/cm.
[0063] A packaging sheet forming the packaging bag 2g has a
breaking strength higher than the peeling strength of the
easy-to-peel layer 103 of the cut tape 100.
[0064] The cut tape 100 may be a four-layer structure consisting of
a low-density polyethylene layer, a polyester layer, a low-density
polyethylene layer and an easy-to-peel layer, a four-layer
structure consisting of a straight-chain low-density polyethylene
layer, a polyester layer, a straight-chain low-density polyethylene
layer and an easy-to-peel layer, a four-layer structure consisting
of a very-low-density polyethylene layer, a polyester layer, a
very-low-density polyethylene layer and an easy-to-peel layer or a
four-layer structure consisting of a cast polypropylene layer, a
polyester layer, a cast polypropylene layer and an easy-to-peel
layer.
[0065] A method of manufacturing the fastener bag 1g will be
described.
[0066] A continuous laminated film is cut in a packaging sheet of a
length equal to twice the sum of the width of the packaging bag 2g
shown in FIG. 10 and the length of the back sealed part 5 of the
packaging bag 2g to form the packaging bag 2g that can be used on
an automatic filling and packaging machine. Side parts 4a and 4b
are bent and are joined such that the inner surfaces thereof are
contiguous to form a tubular structure. Then, a continuous
fastening device 3 with the male fastening member 8 and the female
fastening member 9 engaged and the cut tape 100 are inserted in the
tubular structure.
[0067] The male fastening member 8 and the female fastening member
9 are disposed on the opposite sides, respectively, of the joint of
the side parts 4a and 4b. The cut tape 100 is extended continuously
between the upper and the lower end of the tubular structure on a
part between the base part 8a of the male fastening member 8 and
the base part 9a of the female fastening member 9 of the tubular
structure.
[0068] Then, the joined side parts 4a and 4b of the tubular
structure are bonded together by heat-sealing to form the back
sealed part 5 and, at the same time, the respective base parts 8a
and 9a of the male fastening member 8 and the female fastening
member 9 are welded or bonded to the inner surface of the tubular
structure. Thus, the tubular structure having open opposite ends
and provided with the fastening device 3 and the cut tape 100
attached to its inner surface is formed. The easy-to-peel layer 103
of the cut tape 100 is bonded to the base part 9a of the female
fastening member 9.
[0069] Then, one end of the tubular structure fixedly provided with
the fastening device 3 and the cut tape 100, and having the
opposite open ends is heat-sealed to form a lower heat-sealed part
7. Thus, the packaging bag 2g having an open upper end is obtained.
An article is filled through the open upper end in the packaging
bag 2g, and then the upper end of the packaging bag 2g is
heat-sealed to form the upper heat-sealed part 6. The packaging bag
2g filled with the article is cut along the upper heat-sealed part
6 to separate the packaging bag 2g from the packaging sheet.
[0070] When opening the fastener bag 1g to take out the contents,
the upper heat-sealed part 6 or the lower heat-sealed part 7 is cut
along the cutting lines to form a tab separated from the
heat-sealed part.
[0071] Then, the tab is held between fingers and is pulled away
from the surface of the fastener bag 1g to cut a part of the
packaging bag 2g between the respective base parts 8a and 9a of the
male fastening member 8 and the female fastening member 9 with the
cut tape 100. Consequently, the fastener bag 1g is opened and the
contents can be taken out of the fastener bag 1g through an opening
formed by cutting the packaging bag 2g with the cutting tape
100.
[0072] The remnant contents remaining in the fastener bag 1g after
taking out some of the contents can be sealed in the fastener bag
1g by engaging the male fastening member 8 and the female fastening
member 9.
[0073] A fastener bag 1h in a preferred embodiment of the present
invention shown in FIG. 12 has a packaging bag 2h identical with
the packaging bag 2g of the fastener bag 1g shown in FIG. 10. The
fastener bag 1h differs in the position of its fastening device 3a
from the fastener bag 1g shown in FIG. 10.
[0074] In the fastener bag 1h, both the male fastening member 8 and
the female fastening member 9 of the fastening device 3a are
disposed on the inner surface of the packaging bag 2g shown in FIG.
10 on one side of the back sealed part 5.
[0075] A part of the fastener bag 1h apart from the back sealed
part 5 is cut to open the fastener bag 1h.
[0076] A jip bag 1j in a preferred embodiment according to the
present invention shown in FIG. 13 is identical in the position of
its fastening device 3 with the fastener bag 1g shown in FIG. 10.
Where as the packaging bag 2g of the fastener bag 1g is of a butt
seam type, the packaging bag 2j of the fastener bag 1j is of an
envelope seam type.
INDUSTRIAL APPLICABILITY
[0077] The fastener bag according to the present invention has the
packaging bag formed by processing a single packaging sheet, the
fastening device is disposed on one of the walls of the packaging
bag, and the tear-facilitating means is placed on the inner surface
of the packaging bag or the fastening device. Thus, the fastener
bag can be opened and reclosed and can be used on an ordinary
automatic filling and packaging machine without requiring any
special devices.
[0078] The fastener bag according to the present invention has the
packaging bag formed by processing a single packaging sheet, the
fastening device is disposed on one of the walls of the packaging
bag, and the cut tape is attached to the inner surface of the
packaging bag. Thus, the fastener bag can be opened and reclosed
and can be used on an ordinary automatic filling and packaging
machine without requiring any special devices.
* * * * *