U.S. patent number 3,687,358 [Application Number 05/147,402] was granted by the patent office on 1972-08-29 for manually openable leakproof package construction.
This patent grant is currently assigned to Cadillac Products Inc.. Invention is credited to Robert J. Williams, Anton Wink.
United States Patent |
3,687,358 |
Wink , et al. |
August 29, 1972 |
MANUALLY OPENABLE LEAKPROOF PACKAGE CONSTRUCTION
Abstract
A manually openable leakproof package construction comprising
perforations across one portion of the construction with the
perforations leaving a sufficiently weakened portion such that the
package may be manually torn open across the perforations, a
manually frangible layer of leakproof material such as plastic
overlying said perforations, and with the leakproof layer acting to
seal off the perforated portion such that the package is leakproof
prior to the time the package is manually torn open.
Inventors: |
Wink; Anton (Detroit, MI),
Williams; Robert J. (Birmingham, MI) |
Assignee: |
Cadillac Products Inc.
(N/A)
|
Family
ID: |
22521437 |
Appl.
No.: |
05/147,402 |
Filed: |
May 27, 1971 |
Current U.S.
Class: |
383/208; 383/209;
222/541.6 |
Current CPC
Class: |
B65D
75/5805 (20130101); B65D 75/5833 (20130101); B65D
75/5816 (20130101); B65D 75/20 (20130101) |
Current International
Class: |
B65D
75/52 (20060101); B65D 75/58 (20060101); B65D
75/04 (20060101); B65D 75/20 (20060101); B65d
033/00 () |
Field of
Search: |
;229/66,58,22,51RT,51CE,17G,14BL ;206/56AA,57A,57AB
;222/541,183 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Moorhead; Davis T.
Claims
What is claimed is:
1. A manually openable leakproof package means comprising:
means defining a materially weakened portion in said package
means,
said weakened portion being sufficiently weakened that said package
means may be manually torn open at said weakened portion,
a manually frangible layer of leakproof material overlying said
weakened portion, and
means sealing said frangible layer to said package, said sealing
being continuous and fully surrounding said weakened portion.
2. The package means of claim 1 wherein,
it is of double wall construction.
3. The package means of claim 1 wherein,
said frangible layer is on the outside of the package means.
4. The package means of claim 2 wherein,
said frangible layer is on the inside of the package means.
5. A manually openable leakproof plastic bag, of single or double
wall construction, comprising:
a plastic material means forming the main construction of the bag
and
said plastic material being of relatively nonfrangible
material,
perforation means in at least one portion of the bag
construction,
leakproof means overlying said perforation means and being sealed
to said bag to prevent any leakage therethrough, said overlying
leakproof means being relatively frangible
such that it may be subjected to tearing along with essentially
simultaneous tearing of the perforation means to open the bag.
6. The bag of claim 5 wherein,
it is of double wall construction.
7. The bag of claim 5 wherein,
said overlying leakproof means are on the outside of the plastic
bag.
8. The bag of claim 6 wherein,
said overlying leakproof means are on the inside of the plastic
bag.
9. The package means of claim 1 wherein
a tear open spout means is formed on at least one side of the
package means by a wrap around tearable weakened portion and
corresponding wrap around manually frangible layer which overlies
said weakened portion.
10. The package means of claim 1 wherein
a tear open means is included in at least one side wall of the
package means and wherein said tear open means includes a manually
grippable tear open strip which can be pulled to open the package
means.
11. The package means of claim 1 wherein
a tear off portion extends across the entire top of the package
means and which tear off portion is capable of being manually torn
off to open the entire top of the package means.
Description
BACKGROUND OF THE INVENTION
This invention broadly relates to a manually openable leakproof
package means. More particularly this invention relates to a
manually openable leakproof plastic bag, for example of single or
double wall construction.
It has been conventional in the past to form leakproof packages
such as for example leakproof plastic bags for packaging various
commodities. One technique for preparing such leakproof plastic
bags for use in packaging various items is to extrude a thin walled
cylindrical tube of the plastic material. The cylindrical tube of
plastic material is then folded over, with or without a gusset, and
transversely cut and heat sealed at spaced points to form a
plurality of bags which are open at the top.
Subsequently these bags are filled with various items and then the
top open portion sealed off, for example by heat sealing the
plastic together across the open top, thus resulting in a leakproof
plastic bag holding the containerized contents. One difficulty with
actual usage of such a leakproof plastic bag resides in the fact
that users thereof have significant difficulty in manually opening
the bag, especially in any kind of a uniform fashion. For example,
the plastic bags are difficult to manually open because the plastic
material used in their construction is necessarily relatively
strong and thus the bags are difficult to manually tear open. On
the other hand if the plastic material from which the bags are
constructed is made weak enough such that they can be easily torn
open then the bags are subject to leakage through puncturing,
tearing, etc. which might occur during the normal handling thereof
prior to the time it is actually desired to manually open the bag.
Furthermore, if these plastic bags are manually torn open through
rather strained physical exertion, then still the opening which
results from the tear is usually non-uniform in size and
directional orientation, making it difficult to remove or pour the
contents from the bag in an orderly fashion.
Accordingly, it is a primary object of this invention to provide an
improved manually openable leakproof plastic bag construction. A
related object resides in the provision of such a bag capable of
being manufactured in a continuous manner utilizing conventional
bag making processes.
Another object of the present invention is to provide an improved
manually openable leakproof package means.
Another object of the present invention is to provide a manually
openable leakproof plastic bag of single or double wall
construction.
Another object of the present invention is to provide a manually
openable leakproof package means which includes a manually
frangible layer of leakproof material overlying a weakened portion
in the package which weakened portion is formed of perforations
positioned in the package at a predetermined orientation, with the
frangible layer and the perforations being readily capable of being
torn to open the package in an easily facilitated and desirable
manner.
Another object of the present invention is to provide an improved
manually openable leakproof plastic package wherein a plastic
material forms the main construction of the package and the plastic
material is formed of a relatively non-frangible material and,
wherein at least one section of the plastic is perforated with the
perforations being covered over by a layer of leakproof material
which is relatively frangible.
Other objects, features and advantages of the present invention
will become apparent from the subsequent description and the
appended claims taken in conjunction with the accompanying
drawings, wherein like numerals designate like elements.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 illustrates a package means or bag of double walled plastic
construction in accordance with the invention;
FIG. 2 illustrates a cross sectional view taken along the line 2--2
of FIG. 1 showing the bag slightly expanded;
FIG. 3 illustrates a view of the package in accordance with this
invention taken from the circled area designated 3 in FIG. 2 to
show the construction of the tear open portion of a double walled
bag;
FIG. 4 shows how a similar tear open portion would be constructed
in a single walled bag;
FIG. 5 illustrates a view of another embodiment of a plastic bag in
accordance with the invention which bag includes a tear open
pouring spout on one side thereof;
FIG. 6 illustrates another embodiment of the invention wherein the
plastic bag includes a tear strip for opening the tear portion;
FIG. 7 illustrates a cross sectional view taken along the line 7--7
of FIG. 6;
FIG. 8 illustrates another embodiment of the invention wherein the
plastic bag includes a tear off portion which extends across the
entire top of the bag; and,
FIG. 9 illustrates a cross sectional view taken along the lines
9--9 shown in FIGS. 5 and 8.
SUMMARY OF THE INVENTION
Briefly stated, the present invention is comprised of a manually
openable leakproof package means comprising means defining a
materially weakened portion in said package means, said weakened
portion being sufficiently weakened such that said package means
may be manually torn open at said weakened portion, a manually
frangible layer of leakproof material overlying said weakened
portion, and means sealing said frangible layer to said package,
said sealing being continuous and fully surrounding said weakened
portion.
DESCRIPTION OF PREFERRED EMBODIMENTS
There follows a description of the preferred embodiments of the
invention but it is not intended that the invention should be
limited hereby, as other variations and embodiments will become
apparent from the invention disclosed.
FIGS. 1-3 illustrate a plastic bag designated 10 of double walled
construction as indicated by walls 12 and 14 (FIG. 2). A gusseted
portion designated 16 may if desired be formed at the bottom of the
bag 10 by proper folding of the plastic material from which the bag
is made, and subsequent sealing of the gusset edge areas designated
18.
A manually openable portion of the plastic bag 10 is shown within
the area designated 20 of FIG. 1. The construction of the manually
openable portion 20 is more clearly understood from the cross
sectional views shown in FIGS. 2-3. The two plastic walls 12 and 14
are perforated across one side of the bag as indicated by the
perforations 22 and 24. Just above and below the perforations the
two walls 12 and 14 are joined together for example by heat sealing
at the positions designated 32 and 34. The perforations 22 and 24
in and of themselves would cause leakage in the plastic bag 10,
however, the perforations 22 and 24 are covered over by a manually
frangible layer 40 of leakproof material which is heat sealed to
the bag 10 at positions 41 and 43. The result is that the
perforations cause a weakened portion in the plastic bag 10 and the
perforations themselves are covered by the manually frangible layer
40 which is sealed to the plastic bag 10 to stop any leakage
through the perforations. Yet the bag itself can be readily opened
manually by breaking or tearing apart any desired length of the
perforations which give way essentially simultaneously with the
frangible layer 40. This permits a user of the inventive package
disclosed herein to easily open the package by tearing same along
the predetermined and properly orientated tear open portion 20.
Moreover, when the package is manually opened it can be opened to
either a small or large extent, as may be determined by the length
of the tear which the user of the package desires to make.
FIG. 4 shows a cross section of a tear open portion 20 as would be
constructed in a single walled bag, as opposed to the double walled
construction of the FIG. 3 cross section.
The thickness of the plastic material used to form the package is
not critical other than that the plastic material should be such
that it can be torn across the perforations which are placed
therein to an adequate extent. Any number of different
thermoplastic materials may be used as the plastic for forming the
package described herein. Furthermore, it has been found that
essentially any number of different thicknesses may be used for the
plastic material which forms the walls 12 and/or 14. Also the
package may be of single walled construction as shown in FIG. 4 or
the package may be of doubled walled (as shown in FIG. 2) or higher
construction.
In accordance with our inventive concept the frangible strip or
layer 40 must be strong enough to properly seal off the package
over the perforations such that the package is leakproof, however,
the frangible layer must be weak enough to easily tear when a
person using the package desires to manually open same. Generally
speaking a plastic material, for example polyethylene, having a
thickness of approximately 1/4 mil is sufficient to seal off the
perforations, and such a thickness for the frangible layer 40 has
been found to tear easily when it is desired to manually open the
package. Preferably the perforations should be on the outside of
the package construction, but they may also be positioned on the
inside with the frangible layer being on the outside of the wall
construction. Furthermore, the package construction disclosed
herein could be of other material than plastic, for example it
could be of cardboard construction.
FIG. 5 illustrates another embodiment of the plastic bag in
accordance with this invention wherein a pour spout designated 50
is formed at the left side of the bag as shown in FIG. 5. The pour
spout 50 extends partially around both sides of the bag 10. The
construction of the pour spout is shown in more detail by the cross
sectional view of FIG. 9 taken along line 9--9 of FIG. 5. The wrap
around tear open spout is comprised of the manually frangible layer
of plastic material 40 which overlies and seals off the
perforations 24. When it is desired to open the pouring spout, the
bag is merely gripped in the hands and the tearing action is
initiated at the point designated 51 in FIG. 5 and the tearing
action is continued until the pouring spout is opened by tearing of
the perforations 24 and frangible layer 40, such that the pouring
spout is opened back to the point 52 shown in FIG. 5.
In the FIG. 6 embodiment of the invention a tear strip designated
60 and shown in more detail in the cross sectional view of FIG. 7,
is capable of being grasped at the tab portion 61 and then pulled
outwardly and to the left as shown in FIG. 6 to open the bag 10.
The tear open strip 60 is formed at perforations 63 which outlines
the tear open strip as shown in FIG. 6. The tab portion 61 of the
strip 60 is cut away cleanly from the wall 14 of the bag so that it
can be folded out and grasped by the fingers to open the bag by
pulling the tear strip 60. The inside face of the tear strip 60 is
covered by the frangible layer 40 of plastic material which is heat
sealed at points 41 and 43 to the wall 14 of the bag. The frangible
layer 40 as shown in FIG. 7 is also heat sealed to the tear strip
as shown at 70, such that when the tear strip is grasped and pulled
off the manually frangible layer 40 will also be torn open.
FIG. 8 shows the embodiment of the invention wherein the entire top
of the bag 10 may be removed through the provision of a tear off
portion designated 20a which extends across the entire top of the
bag. The detailed construction of the tear open portion of 20a
which extends across the top of the bag 10 is shown in the cross
sectional view of FIG. 9 which is taken along line 9--9 in FIG. 8.
Generally in order to open the tear off top shown in FIG. 8 it is
only necessary to initiate a tearing action across the bag by
gripping it with the hands, for example, and tearing from the point
81 across to the point 82, or vice versa.
It should also be appreciated that the bag embodiments shown in
FIGS. 5-9 may alternatively be of double walled (or higher)
construction rather than the single walled construction shown in
these figures.
While it will be apparent that the preferred embodiments of the
invention disclosed are well calculated to fulfill the objects
above stated, it will be appreciated that the invention is
susceptible to modification, variation and change without departing
from the proper scope or fair meaning of the subjoined claims.
* * * * *