U.S. patent application number 10/499344 was filed with the patent office on 2005-03-24 for sealed bag with unsealing tape.
This patent application is currently assigned to IDEMITSU UNITECH CO., LTD.. Invention is credited to Goto, Shuichi, Ohki, Yuichi.
Application Number | 20050063624 10/499344 |
Document ID | / |
Family ID | 19187750 |
Filed Date | 2005-03-24 |
United States Patent
Application |
20050063624 |
Kind Code |
A1 |
Goto, Shuichi ; et
al. |
March 24, 2005 |
Sealed bag with unsealing tape
Abstract
A zipper 3 (translator's comment: the zipper should be coded as
11 instead of 3) is stuck on the opening part 2 side of a packaging
bag 1 and a heat-sealed part 12 is formed in the outer side from
the zipper 3 (translator's comment: the zipper should be coded as
11 instead of 3) to seal the packaging bag 1. A band-shaped
unsealing tape 3 is stuck, in parallel to the opening part 2, on
one inner surface of the packaging bag 1 in an area between the
zipper 3 (translator's comment: the zipper should be coded as 11
instead of 3) and the heat-sealed part 12. A cutout part 4 is
formed on a surface opposite to the surface with the unsealing tape
3 stuck thereon at the end part of the unsealing tape 3. A pair of
cut-in parts 5 are formed on the packaging bag 1 at the end part of
the unsealing tape 3.
Inventors: |
Goto, Shuichi; (Tokyo,
JP) ; Ohki, Yuichi; (Tokyo, JP) |
Correspondence
Address: |
OBLON, SPIVAK, MCCLELLAND, MAIER & NEUSTADT, P.C.
1940 DUKE STREET
ALEXANDRIA
VA
22314
US
|
Assignee: |
IDEMITSU UNITECH CO., LTD.
2-1 Koishikawa 1-chome, Bunkyo-ku
Tokyo
JP
112-0002
|
Family ID: |
19187750 |
Appl. No.: |
10/499344 |
Filed: |
November 12, 2004 |
PCT Filed: |
December 17, 2002 |
PCT NO: |
PCT/JP02/13170 |
Current U.S.
Class: |
383/205 ;
383/204; 383/61.2; 383/63 |
Current CPC
Class: |
B65D 75/66 20130101;
B31B 70/8123 20170801; B65D 75/5805 20130101 |
Class at
Publication: |
383/205 ;
383/204; 383/061.2; 383/063 |
International
Class: |
B65D 033/00 |
Foreign Application Data
Date |
Code |
Application Number |
Dec 18, 2001 |
JP |
2001-384731 |
Claims
1. A sealed bag with unsealing tape having unsealing tape provided
on an opening part side of a packaging bag, said sealed bag
comprising a band-shaped unsealing tape stuck in parallel to said
opening part on one inner surface of said packaging bag, wherein a
cutout part is formed on a surface opposite to the surface with
said unsealing tape stuck thereon, on an end part side of said
unsealing tape of said packaging bag.
2. The sealed bag with unsealing tape according to claim 1, wherein
a pair of cut-in parts extending from an edge of said unsealing
tape with the end parts positioned in the inner side of said
unsealing tape are formed on said packaging bag and/or said
unsealing tape.
3. The sealed bag with unsealing tape according to claim 1 or claim
2, wherein said cut-in parts are inclined against said unsealing
tape, and a base end of each cut-in part is present in the outer
side from said unsealing tape.
4. The sealed bag with unsealing tape according to any of claims 1
to 3, wherein said unsealing tape is uniaxially drawn in the
longitudinal direction.
5. The sealed bag with unsealing tape according to any of claims 1
to 4, wherein said unsealing tape is made of polyolefin-based
resin.
6. The sealed bag with unsealing tape according to claim 5, wherein
said polyolefin-based resin is polyethylene-based resin.
7. The sealed bag with unsealing tape according to claim 5, wherein
said polyolefin-based resin is polypropylene-based resin.
8. The sealed bag with unsealing tape according to any of claims 1
to 7, wherein a zipper comprising a pair of a male member and a
female member is stuck to both inner surfaces of the bag
respectively.
Description
TECHNICAL FIELD
[0001] The present invention relates to a sealed bag with unsealing
tape. More specifically this invention relates to a sealed bag with
unsealing tape provided on the opening-part side of a packaging bag
used for packaging foods, drugs or the like therein.
BACKGROUND ART
[0002] Conventionally, bags (chuck bags) enable to be easily opened
and closed by forming a zipper (an engaging device), which includes
a male member and a female member, in an opening-part thereof have
been used in many fields such as foods, drugs, daily commodities,
and the like. Even with the bag with a zipper as described above,
it is desirable that the bag is kept in the completely sealed state
until the time point of sales, and generally an end part there of
is completely sealed along the zipper part. In a case of a bag with
a zipper which is completely sealed, generally a section between
the zipper and a seal part in the opening-part side of the bag is
cut in, and then the bag is opened and resealed at the zipper
part.
[0003] For opening a sealed bag, a user generally cuts the bag with
the conventional type of scissors or tears a part to be cut in with
hands from an end part thereof. To facilitate the operation of
tearing the part to be cut in with hands, sometimes a notch is
formed at a side edge of the bag.
[0004] However, use of scissors is messy, and in addition, if
scissors are not available, the bag can not be opened, which is
disadvantageous. When a bag is torn from the notch, the bag can not
be cut in along a straight line, which is also disadvantageous. To
overcome the problems as described above, recently there has been
proposed, for instance, the following means as a means for tearing
a bag along a straight line manually and without using any tool
such as scissors.
[0005] Means 1: Formation of a perforated line as a line for
tearing on the opening-part side
[0006] Means 2: Use of laminated film with the inner surface film
relatively thick for forming a bag, and formation of a zipper on
the inner surface film as well as a perforated line in a part outer
from the zipper formed on the inner surface film and closer to an
edge of the bag (Refer to Japanese Utility Model Publication No.
S52-18254).
[0007] Means 3: Formation of a cutting-plane line having a specific
form (Refer to Japanese Utility Model Publication No. S62-13838)
However, each of the means described above has the problems as
described below.
[0008] With the means 1, the sealing performance is rather low
because of the use of a perforated line, and sometimes the bag
employing the means 1 may be opened during transportation or in
other similar situations.
[0009] With the means 2, an inner surface side film with a
perforated line formed thereon itself can be tone along a straight
line, but when the inner surface side film is thermally fused and
stuck to the base film, the perforations are filled with materials
from the base film due to the thermal effect, which
disadvantageously makes it difficult to tear the bag.
[0010] With the means 3, the sealing performance is insufficient,
and in addition the process for forming a specific cutting-plane
line is disadvantageously complicated.
DISCLOSURE OF THE INVENTION
[0011] A main object of the present invention is to provide a
sealed bag with unsealing tape which can provide the excellent
sealing performance before its use and also which can easily be cut
in and unsealed manually.
[0012] The present invention provides a sealed bag with unsealing
tape provided on an opening-part side of a packaging bag, and the
sealed bad according to the present invention comprises band-shaped
unsealing tape provided on one inner surface side of the bag and
stuck there to in parallel to the opening part of the bag, and is
characterized in that a cutout part is formed at an end part of the
unsealed tape of the packaging bag on a surface opposite to the
side on which the unsealed tape is stuck.
[0013] Adhesion of the unsealing tape is carried out by using an
adhesive or thermally, for instance, by heat-sealing. The tape of
the present invention is not limited to the one with the large
width, but can be the one with the small width, and even be the one
having a form like a string so long as the tearing guide effect can
be obtained. Tape with the relatively smaller width is preferable
because the tearing guide effect is higher. However, when the width
is large, the higher tensile strength can be obtained even if the
thickness is small. When the width is small, the high strength can
be obtained by making the thickness larger, and the so-called
string-formed tape having an oval or circular cross section may be
used in the present invention.
[0014] With the present invention as described above, band-shaped
unsealing tape is stuck on one inner surface of a packaging bag in
parallel to the opening part thereof, and a perforated line or the
like is not provided, and because of the configuration, there is
not a space communicating to the outside, so that the excellent
sealing performance before the packaging bag is opened is provided
without fail.
[0015] Further, a cutout part is formed on a surface opposite to
the surface with the unsealing tape stuck thereon at an end part of
the unsealing tape of the packaging bag, therefore the cutout part
is present on one surface of the packaging bag as well as on one
surface of the unsealing tape, so that the end part of the
unsealing tape is exposed in the cutout part and the cutout par can
easily be raised.
[0016] In the sealed bag with unsealing tape according to the
present invention, it is preferable to form, on the packaging bag
and/or on the unsealing tape, a pair of cut-in parts each cut in
from an end part of the unsealing tape with the terminating edge
present at a position inner from the end part of the unsealing
tape.
[0017] With the present invention as described above, as a pair of
cut-in parts are formed on the packaging bag and/or at end parts of
the unsealing tape, a section between the cut-in parts functions
like a tab, and the tab-formed section can be pinched as it is when
unsealing the packaging bag, so that the operation for manually
cut-in and unsealing the bag can easily be performed.
[0018] In the sealed bag with unsealing tape according to the
present invention, the cut-in parts are preferably arranged
diagonally against the unsealing tape with the base edges of the
cut-in parts arranged outside the unsealing tape.
[0019] With the present invention as described above, as the cut-in
part are inclined, even if a position at which the unsealing tape
is stuck is slightly displaced from the regular position, cut-in
parts can be formed correctly on one surface of the packaging bag
as well as on the unsealing tape without fail. Especially, the pair
of cut-in parts get closer in a direction toward the depth of the
bag (in which cutting-in is performed), so that the cut-plane line
can be guided to a specified position (such as a center line of the
unsealing tape), and a desired and correct cut-plane line can be
acquired without fail, even if the work for cutting in is performed
manually.
[0020] In the sealed bag with unsealing tape according to the
present invention, the unsealing tape is preferably drawn
uniaxially in the longitudinal direction.
[0021] Herein the term of "drawing" means physically drawing a
polymeric material into the fiber-like or film-formed state. With
this operation, the strength or elasticity modulus of the polymeric
material can be improved, and when a crystalline polymer is drawn
at a temperature higher than the glass transition temperature but
lower than the melting point, molecules in the non-crystalline
portion are drawn in the drawing direction with the crystallinity
improved and the molecules are oriented in the drawing direction.
As a result, the tensile strength and elasticity modulus become
larger. Uniaxially drawing herein indicates drawing in one
direction, and for instance, when a film is drawn uniaxially, the
strength in the drawing direction becomes stronger than that in the
vertical direction to provide an anisotropic material, and when the
material is torn, the directivity for being torn in the drawing
direction becomes higher.
[0022] Because of this feature, the draw ratio should be 5 times or
more, and preferably in the range from 8 to 12 times. As the
unsealing tape is uniaxially drawn in the longitudinal direction,
the directivity in tearing becomes higher, and the bag can be
unsealed linearly in the longitudinal direction of the unsealing
tape.
[0023] In the sealed bag with unsealing tape according to the
present invention, the unsealing tape is preferably made of
polyolefin-based resin, and the polyolefin-based resin is
preferably polyethylene-based resin or polypropylene-based
resin.
[0024] As the polyolefin-based resin, there can be enlisted
polyethylene, polypropylene, polybutene and the like.
[0025] As the polyethylene-based resin, there can be enlisted
linear low density polyethylene (LLDPE), high density polyethylene
(HDPE), low density polyethylene (LDPE) or the like.
[0026] As the polypropylene for producing polypropylene-based
resin, there can be enlisted homopolypropylene, random
polypropylene, block polypropylene and the like.
[0027] Because of the features described above, the unsealing tape
is made of polyolefin-based resin, so that processing such as
molding or drawing is performed easy because the polyolefin-based
resin has the thermoplasticity, Further, the polyethylene-based
resin is excellent in the dampproof capability, waterproof
capability, cold resistance, and chemical resistance, and is well
adapted to use for packaging a product in the liquid state.
[0028] Further, the polypropylene-based resin has the small
specific gravity, so that the resin can contribute to weight
reduction of a packaging bag itself.
[0029] In the sealed bag according to the present invention, a
zipper comprising a pair of male and female members is preferably
stuck to both inner surfaces of the bag.
[0030] Because of the feature, a zipper comprising a pair of male
and female members is stuck to both inner surfaces of the bag, and
the zipper can repeatedly be opened or closed, so that the sealing
performance of the bag can be maintained.
BRIEF DESCRIPTION OF DRAWINGS
[0031] FIG. 1 is a flat view showing a packaging bag according to
one embodiment of the present invention;
[0032] FIG. 2 is an enlarged flat view showing a packaging bag
according to the embodiment;
[0033] FIG. 3 is a cross-sectional view of the packaging bag taken
along the line X-X in FIG. 2;
[0034] FIG. 4 is a view showing the procedure for opening the
packaging bag according to the embodiment;
[0035] FIG. 5 is a view showing the procedure for producing the
packaging bag according to the embodiment; and
[0036] FIG. 6 is a flat view showing a packaging bag according to
another embodiment of the present invention.
BEST MODE FOR CARRYING OUT THE INVENTION
[0037] Embodiments of the present invention are described below
with reference to the related drawings.
[0038] FIG. 1 shows a packaging bag 1 according to one embodiment
of the present invention.
[0039] The packaging bag 1 comprises polyethylene sheets 10A (top
side in the figure), 10B (rear side in the figure) sealed along the
four edges thereof by means of heat sealing or the like. These
sealed portions form a heat-sealed part 12. One edge of the
rectangular packaging bag 1 functions as an opening part 2.
[0040] Unsealing tape 3 is wide tape made of polyolefin-based resin
and is welded to the opening part 2 side on a surface of the
polyethylene sheet 10B by heat sealing or the like, and is drawn
uniaxially in the longitudinal direction.
[0041] A cutout part 4 is formed at an end part of the unsealing
tape 3 of the packaging bag 1 on the opening part 2 side on a
surface of the polyethylene sheet 1 OA and has a rectangular
form.
[0042] A cut-in part 5 is formed at an end part of the unsealing
tape 3 and is inclined from the polyethylene sheet 10B against an
edge of the unsealing tape 3 so that the cut-in part 5 extends to
inside of the unsealing tape 3. Further the cut-in part 5 is formed
within a range of the cutout part 4. It is to be noted that the
cutout part 4 and cut-in part are provided both on heat-sealed
parts 12 of two edges perpendicular to the opening section 2 in
this embodiment.
[0043] A zipper 11 comprises a pair of a male member and a female
member, which are stuck by heat sealing or the like under the
unsealing tape 3 on the opening part 2 side to the polyethylene
sheets 10A, 10B respectively. The zipper 11 is stuck to an inner
surface of the packaging bag 1. The zipper 11 is made of
polyethylene.
[0044] As shown in FIG. 2, the cutout part 4 is formed on the
opening part 2 side and on a surface of the polyethylene sheet 10A
and has a rectangular form, while the cut-in part 5 is positioned
at an end part of the unsealing tape 3 in the outer side from the
unsealing tape 3, and inclined from a cut-in part base end 5A
positioned on the polyethylene sheet 10B, and extends to a cut-in
part end part 5B positioned in the inner side from the unsealing
tape 3.
[0045] The cut-in part end part 5B is formed in the inner side from
the unsealing tape 3 as shown in FIG. 3 which is a cross-sectional
view taken along the line X-X in FIG. 2.
[0046] As for the procedure for unsealing the packaging bag 1, as
shown in FIG. 4, an end part of the unsealing tape 3 is pinched up,
and then is pulled in the direction indicated by the arrow in the
figure to tear the packaging bag 1. The section in which the
polyethylene sheet 10B, unsealing tape 3, and polyethylene 10A are
overlaid on each other is linearly torn from the cut-in part end
part 5B in a direction parallel to the unsealing tape 3.
[0047] As for the procedure for manufacturing the packaging bag 1,
as shown in FIG. 5, at first, the unsealing tape 3 is held between
the polyethylene sheets 10A, 10B. The cutout part 4 is formed at a
position corresponding to the unsealing tape 3 on the polyethylene
sheet 10A. The polyethylene sheets 10A, 10B, and the unsealing tape
3 are heated, melted and stuck to each other by a heat seal bar 20,
and a heat-sealed part 12 is formed at a position corresponding to
the cutout part 4.
[0048] Then two sets of cut-in parts 5 widening toward the end and
each extending over an edge of the unsealing tape 3 are formed
within the cutout parts 4. In this step, the two sets of cut-in
parts 5 widening toward the end are opposite to each other.
[0049] The section in which the polyethylene sheet 10B, unsealing
tape 3, and polyethylene sheet 10A are overlaid on each other is
cut in with a cut-in part bar 30 between the two sets of cut-in
parts 5.
[0050] With the steps described above, the polyethylene sheets 10B
with the two sets of cutout parts 4 and cut-in parts 5 formed
thereon, unsealing tape 3, and polyethylene sheets 10A are
laminated to form a laminated body, and heat-sealed parts are
formed along two edges each perpendicular to the heat-sealed part
12 shown in the figure, thus a packaging bag being formed.
[0051] With the embodiment as described above, the advantages as
described below are provided.
[0052] (1) The cut-in parts 5 inclining against edges of the
unsealing tape 3 and extending to inside of the unsealing tape 3
are formed at an end part of the unsealing tape 3, and the cut-in
parts 5 can be pinched as they are as a finger grip, so that the
operation of manually unsealing the bag can easily be
performed.
[0053] Further, as the cut-in parts 5 are inclined, therefore even
if the unsealing tape 3 is stuck at a position slightly displaced
from the regular position, the cut-in parts 5 can be formed without
fail on a surface of the polyethylene sheet 10B of the packaging
bag 1 as well as on the unsealing tape 3.
[0054] In addition, the packaging bag 1 comprises the band-shaped
unsealing tape 3 which is stuck on one inner surface of the
packaging bag 1 in parallel to the opening part 2, and a perforated
line or the like is not required to be formed thereon, so that a
space communicating to the outside is not generated, which ensures
the sealing performance before the packaging bag 1 is unsealed.
[0055] (2) The cutout part 4 is formed on an inner surface opposite
to that on which the unsealing tape 3 is stuck at an end part of
the unsealing tape 3 of the packaging bag 1, and therefore the
cutout part 4 is present only on the unsealing tape 3 and on the
polyethylene sheet 10A of the packaging bag 1, so that the cutout
part 4 is thin and the cut-in part 5 can easily be raised.
[0056] (3) The unsealing tape 3 is uniaxially drawn in the
longitudinal direction, and the directivity in tearing becomes
higher, so that the packaging bag 1 can linearly be unsealed in the
longitudinal direction of the unsealing tape 3.
[0057] The present invention is not limited to the embodiment
described above, and modifications and improvements in a range in
which objects of the present invention can be achieved are
encompassed within a scope of the present invention. For instance,
although the cut-in part 5 inclines from the cut-in part base end
5A positioned in the outer side from the unsealing tape 3 and
extends to the cut-in end parts 5B positioned in the inner side
from the unsealing tape 3, the present invention is not limited to
this configuration, and the cut-in part 5 may have the cut-in part
base end 5A positioned in the inner side from the unsealing tape
3.
[0058] In this case, the cut-in part 5 may not incline, and the
pair of cut-in parts may be, for instance, parallel to each other
as shown in FIG. 6.
[0059] Although the cutout parts 4 and cut-in parts 5 are formed at
both end parts of the unsealing tape 3 respectively in the
embodiment described above, the configuration is allowable in which
the cutout part and the cut-in part are formed only at one end part
(namely, only in the right or left side of the bag shown in FIG. 2
and FIG. 6).
[0060] It is not always necessary to form the pair of cut-in pasts
5, and it is possible to pinch only the polyethylene sheet 10B and
unsealing tape 3 with the cutout part 4, and therefore the work for
tearing can easily be started by pinching this section.
[0061] The unsealing tape 3 is not limited to that having a
relatively large width as described in the embodiment above, and
also the unsealing tape having a small width may be used, and even
the unsealing tape 3 like a string may be used so long as the
tensile strength providing the tearing guide effect can be
obtained.
[0062] Further, the zipper 11 is stuck to the opening part 2 side
in the embodiment described above, but may not be provided. In this
case, the packaging bag is adapted to be used as a disposable
bag.
[0063] The unsealing tape 3 is made of polyethylene in the
embodiment described above, but the material is not limited to
polyethylene, and the unsealing tape 3 may be made of
polypropylene.
[0064] In addition, structures, forms and the like for carrying out
the present invention may be different from those described above
within the range in which the object of the present invention can
be achieved.
INDUSTRIAL AVAILABILITY
[0065] The present invention can be applied to packaging bags for
packing foods, drugs, and the like therein, especially as a sealed
bag with unsealing tape, an opening part side of which can easily
be unsealed.
* * * * *