U.S. patent application number 16/645172 was filed with the patent office on 2020-09-10 for fastener tape.
This patent application is currently assigned to Kyodo Printing Co., Ltd.. The applicant listed for this patent is Kyodo Printing Co., Ltd.. Invention is credited to Yoshiyuki ATSUCHI, Saori KIMURA, Azusa OSAWA.
Application Number | 20200283198 16/645172 |
Document ID | / |
Family ID | 1000004868288 |
Filed Date | 2020-09-10 |
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United States Patent
Application |
20200283198 |
Kind Code |
A1 |
ATSUCHI; Yoshiyuki ; et
al. |
September 10, 2020 |
FASTENER TAPE
Abstract
This fastener tape includes a first belt-shaped member and a
second belt-shaped member that are engageable with each other, the
first and second belt-shaped members being constituted with a resin
composition containing an ethylene-vinyl alcohol copolymer and an
acid-modified polyolefin resin.
Inventors: |
ATSUCHI; Yoshiyuki; (Tokyo,
JP) ; OSAWA; Azusa; (Tokyo, JP) ; KIMURA;
Saori; (Tokyo, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Kyodo Printing Co., Ltd. |
Tokyo |
|
JP |
|
|
Assignee: |
Kyodo Printing Co., Ltd.
Tokyo
JP
|
Family ID: |
1000004868288 |
Appl. No.: |
16/645172 |
Filed: |
September 13, 2018 |
PCT Filed: |
September 13, 2018 |
PCT NO: |
PCT/JP2018/034044 |
371 Date: |
March 6, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B65D 33/2508
20130101 |
International
Class: |
B65D 33/25 20060101
B65D033/25 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 15, 2017 |
JP |
2017-178353 |
Claims
1. A fastener tape comprised of first and second strip-like members
that can be mutually engaged; wherein the first and second
strip-like members are composed with a resin composition containing
an ethylene-vinyl alcohol copolymer and an acid-modified
polyolefin-based resin.
2. The fastener tape according to claim 1, wherein the resin
composition contains 65-95 mass % of an ethylene-vinyl alcohol
copolymer and 5-35 mass % of an acid-modified polyolefin-based
resin.
3. The fastener tape according to claim 1, wherein the content of
ethylene monomer unit in the ethylene-vinyl alcohol copolymer is
10-70 mol % based on the total number of moles of the ethylene
monomer unit and vinyl alcohol monomer unit in the entire
ethylene-vinyl alcohol copolymer.
4. The fastener tape according to claim 1, wherein the melt mass
flow rate of the resin composition as determined in compliance with
JIS K7210-1 is 1.0 g/10 min or more under conditions of a
temperature of 260.degree. C. and load of 21.18 N.
5. The fastener tape according to claim 1, wherein when the resin
composition is molded into a film, cut to a size of 10 cm.times.10
cm, one surface is exposed for one week to L-menthol vapor in an
environment at 40.degree. C., the adsorbed L-menthol is extracted
with methyl ethyl ketone, and the amount of L-menthol in the
extract is quantified by gas chromatography, the adsorbed amount of
L-menthol in the film is 0.7 mg or less.
6. A packaging bag with fastener tape provided with: a packaging
bag composed with a packaging bag film provided with a
non-adsorbent layer, containing an ethylene-vinyl alcohol
copolymer, for the innermost layer, and the fastener tape according
to claim 1 fused to the non-adsorbent layer so that the first and
second strip-like members are mutually opposing.
7. A method for producing a packaging bag with fastener tape using:
a fastener tape comprised of first and second strip-like members
that can be mutually engaged, wherein the first and second
strip-like members are composed with a resin composition containing
an ethylene-vinyl alcohol copolymer and an acid-modified
polyolefin-based resin, and a packaging bag film provided with a
non-adsorbent layer containing an ethylene-vinyl alcohol copolymer,
the method including: fusing the fastener tape to the non-adsorbent
layer, and fusing the ends of the non-adsorbent layer by mutually
opposing to form a bag such that the first and second strip-like
members of the fastener tape are mutually opposing; wherein, when
forming a bag by fusing the ends of the non-adsorbent layer by
mutually opposing, at least a portion of the fastener tape is
integrally fused and collapsed together with the ends of the
non-adsorbent layer between the mutually opposing ends of the
non-adsorbent layer.
Description
FIELD
[0001] The present invention relates to a fastener tape (zipper
tape).
BACKGROUND
[0002] Packaging bags provided with fastener tape are widely used
as a means of sealing contents such as food. Packaging bags with
fastener tape are useful since they can be resealed after having
been opened.
[0003] The product value of contents enclosed in a packaging bag
with fastener tape are influenced by volatile components such as
aromatic components contained therein. In such cases, the packaging
bag with fastener tape is required to not adsorb these components.
Various means have been proposed to satisfy this requirement.
[0004] PTL1 discloses a fastener tape comprised of an
ethylene-vinyl alcohol copolymer and a packaging bag having a
fastener tape comprising an ethylene-vinyl alcohol copolymer layer
for the innermost layer and an ethylene-vinyl alcohol copolymer for
the opening.
[0005] PTL2 discloses a fastener tape joined to the inner surface
of a packaging bag having a plastic innermost layer, wherein the
fastener tape is provided with a pair of plastic linear members
having a strip-like interlocking engageable structure and a pair of
plastic strip-like sheets in which this pair of linear members is
attached in the lengthwise direction on opposing surfaces, and the
strip-like sheets are provided with a substrate film capable of
joining with the inner surface of the packaging bag and a first
fusing resin layer formed over the entire surface on the side
opposing this substrate film.
CITATION LIST
Patent Literature
[0006] PTL1: JP H3-289401 A
[0007] PTL2: JP 2012-158378 A
SUMMARY
Technical Problem
[0008] Although ethylene-vinyl alcohol copolymers have superior
non-adsorbency, they have the shortcomings of inadequate
flexibility and heat sealability. Thus, in the case of fabricating
a fastener tape made of an ethylene-vinyl alcohol copolymer and a
packaging bag with fastener tape using a film made of an
ethylene-vinyl alcohol copolymer as in PTL1, although
non-adsorbency is obtained, the packaging bag cannot be opened
easily due to inadequate flexibility. In this packaging bag with
fastener tape, as a result of being unable to obtain adequate heat
sealability between the fastener tape and film, the fused portion
between the fastener tape and film is unable to withstand the
engaging strength of the fastener tape, thereby causing the
fastener tape to detach when opening.
[0009] Even in the case of using the fastener tape described in
PTL2 by adhering to a packaging bag made of an ethylene-vinyl
alcohol copolymer, since the fastener tape portion lacks
non-adsorbency, adequate non-adsorbency is unable to be obtained
for the entire packaging bag.
[0010] Therefore, there is a need to provide a fastener tape that
can be fused with adequate strength to a non-adsorbent packaging
bag, is non-adsorbent with respect to aromatic components, and is
able to demonstrate favorable openability.
Solution to Problem
[0011] As a result of conducting extensive studies, the inventors
of the present invention found that the aforementioned problems can
be solved by the means indicated below, thereby leading to
completion of the present invention. Namely, the present invention
is as indicated below.
[0012] <Aspect 1>
[0013] A fastener tape comprised of first and second strip-like
members that can be mutually engaged: wherein
[0014] the first and second strip-like members are composed with a
resin composition containing an ethylene-vinyl alcohol copolymer
and an acid-modified polyolefin-based resin.
[0015] <Aspect 2>
[0016] The fastener tape according to Aspect 1, wherein the resin
composition contains 65-95 mass % of an ethylene-vinyl alcohol
copolymer and 5-35 mass % of an acid-modified polyolefin-based
resin.
[0017] <Aspect 3>
[0018] The fastener tape according to Aspect 1 or 2, wherein the
content of ethylene monomer unit in the ethylene-vinyl alcohol
copolymer is 10-70 mol % based on the total number of moles of the
ethylene monomer unit and vinyl alcohol monomer unit in the entire
ethylene-vinyl alcohol copolymer.
[0019] <Aspect 4>
[0020] The fastener tape according to any one of Aspects 1 to 3,
wherein the melt mass flow rate of the resin composition as
determined in compliance with JIS K7210-1 is 1.0 g/10 min or more
under conditions of a temperature of 260.degree. C. and load of
21.18 N.
[0021] <Aspect 5>
[0022] The fastener tape according to any one of Aspects 1 to 4,
wherein when the resin composition is molded into a film, cut to a
size of 10 cm.times.10 cm, one surface is exposed for one week to
L-menthol vapor in an environment at 40.degree. C., the adsorbed
L-menthol is extracted with methyl ethyl ketone, and the amount of
L-menthol in the extract is quantified by gas chromatography, the
adsorbed amount of L-menthol in the film is 0.7 mg or less.
[0023] <Aspect 6>
[0024] A packaging bag with fastener tape provided with:
[0025] a packaging bag composed with a packaging bag film provided
with a non-adsorbent layer, containing an ethylene-vinyl alcohol
copolymer, for the innermost layer, and
[0026] the fastener tape according to any one of Aspects 1 to 5
fused to the non-adsorbent layer so that the first and second
strip-like members are mutually opposing.
[0027] <Aspect 7>
[0028] A method for producing a packaging bag with fastener tape
using:
[0029] a fastener tape comprised of first and second strip-like
members that can be mutually engaged, wherein the first and second
strip-like members are composed with a resin composition containing
an ethylene-vinyl alcohol copolymer and an acid-modified
polyolefin-based resin, and
[0030] a packaging bag film provided with a non-adsorbent layer
containing an ethylene-vinyl alcohol copolymer, the method
including:
[0031] fusing the fastener tape to the non-adsorbent layer, and
[0032] fusing the ends of the non-adsorbent layer by mutually
opposing to form a bag such that the first and second strip-like
members of the fastener tape are mutually opposing: wherein,
[0033] when forming a bag by fusing the ends of the non-adsorbent
layer by mutually opposing, at least a portion of the fastener tape
is integrally fused and collapsed together with the ends of the
non-adsorbent layer between the mutually opposing ends of the
non-adsorbent layer.
Advantageous Effects of Invention
[0034] According to the present invention, a fastener tape can be
provided, the fastener tape being able to be fused with adequate
strength to a non-adsorbent packaging bag, being non-adsorbent with
respect to aromatic components, and being able to demonstrate
favorable openability.
BRIEF DESCRIPTION OF DRAWINGS
[0035] FIG. 1 depicts drawings indicating one aspect of the
fastener tape of the present invention.
[0036] FIG. 2 depicts drawings indicating one aspect of a packaging
bag with fastener tape of the present invention.
[0037] FIG. 3 depicts drawings indicating each step of one aspect
of the method of the present invention for manufacturing a
packaging bag with fastener tape.
DESCRIPTION OF EMBODIMENTS
[0038] <<Fastener Tape>>
[0039] As shown in FIG. 1, the fastener tape 100 of the present
invention is a fastener tape comprised of a first strip-like member
10 and a second strip-like member 20 that can be mutually engaged.
In one aspect of the fastener tape of the present invention, the
first strip-like member 10 has an engageable portion 12 and the
second strip-like member 20 has an engageable portion 22.
[0040] The first and second strip-like members are composed with a
resin composition containing an ethylene-vinyl alcohol copolymer
(EVOH) and an acid-modified polyolefin-based resin.
[0041] According to the aforementioned composition, a fastener tape
can be provided, the fastener tape being able to be fused with
adequate strength to a non-adsorbent packaging bag, and
particularly a packaging bag provided with a layer containing an
ethylene-vinyl alcohol copolymer for the innermost layer thereof,
being non-adsorbent with respect to an aromatic component, and
demonstrating favorable flexibility after molding as a result of
having suitable flexibility.
[0042] Examples of aromatic components include menthol, limonene,
methyl salicylate, camphor and tocopherol, etc.
[0043] The following provides an explanation of each constituent of
the present invention.
[0044] <First and Second Strip-Like Members>
[0045] The first and second strip-like members are a pair of
members that can be mutually engaged. The first and second
strip-like members are composed with the resin composition
described below.
[0046] As shown in FIG. 1, for example, the first strip-like member
10 and the second strip-like member 20 respectively have the
engageable portion 12 and the engageable portion 22. In this
aspect, the surface of the engageable portion 12 of the first
strip-like member 10 and the surface of the engageable portion 22
of the second strip-like member 20 are each surfaces that fuse with
the packaging bag.
[0047] (Resin Composition)
[0048] The resin composition composing the first and second
strip-like members contains EVOH and an acid-modified
polyolefin-based resin.
[0049] The content of EVOH can be 60 mass %6 or more, 65 mass % or
more, 70 mass % or more, 75 mass % or more, 80 mass % or more or 82
mass % or more, and 95 mass % or less, 93 mass % or less or 90 mass
% or less. This content being 65 mass % or more, 70 mass % or more,
75 mass % or more, 80 mass % or more or 82 mass % or more and 90
mass % or less is preferable from the viewpoint of realizing both
favorable heat sealing strength with the non-adsorbent packaging
bag and favorable non-adsorbency.
[0050] The content of the acid-modified polyolefin-based resin can
be 5 mass % or more, 7 mass % or more or 10 mass % or more, and 40
mass % or less, 35 mass % or less, 30 mass % or less, 25 mass % or
less, 20 mass % or less or 18 mass % or less. This content being 10
mass % or more and 35 mass % or less, 30 mass % or less, 25 mass %
or less, 20 mass % or less or 18 mass % or less is preferable from
the viewpoint of realizing both favorable heat sealing strength
with the non-adsorbent packaging bag and favorable non-adsorbency.
As a result of having the aforementioned content, suitable
flexibility can be imparted to the resin and favorable openability
can be demonstrated when molded into a fastener tape, thereby
making this preferable.
[0051] The melt mass flow rate of the resin composition as
determined in compliance with JIS K7210-1 being 1.0 g/10 min or
more under conditions of a temperature of 260.degree. C. and load
of 21.18 N is preferable from the viewpoint of enabling at least a
portion of the fastener tape to be integrally fused and collapsed
between the mutually opposing ends of the innermost layer of the
packaging bag, and particularly between the mutually opposing ends
of a non-adsorbent layer of a non-adsorbent packaging bag, thereby
resulting in favorable sealing performance of the packaging bag.
This melt mass flow rate can be 1.0 g/10 min or more, 2.0 g/10 min
or more or 3.0 g/10 min or more and 100 g/10 min or less, 80 g/10
min or less, 60 g/10 min or less, 50 g/10 min or less, 40 g/10 min
or less, 30 g/10 min or less, 25 g/10 min or less, 20 g/10 min or
less, 15 g/10 min or less or 10 g/10 min or less.
[0052] This MFR may be determined by directly measuring the weight
of an extrudate extruded for 10 minutes in compliance with Method A
of JIS K7210-1, or by measuring the volume of an extrudate extruded
for 10 minutes followed by calculating the weight of the extrudate
using the density of the extrudate in compliance with Method B.
[0053] The resin composition having the aforementioned composition
can have high non-adsorbency. More specifically, when this resin
composition is molded into a film, cut to a size of 10 cm.times.10
cm, one surface is exposed for one week to L-menthol vapor in an
environment at 40.degree. C., the adsorbed L-menthol is extracted
with methyl ethyl ketone, and the amount of adsorbed L-menthol in
the extract is quantified by gas chromatography, the adsorbed
amount of L-menthol in this film can be 0.7 mg or less. This
adsorbed amount of L-menthol can be 0.6 mg or less, 0.5 mg or less,
0.4 mg or less, 0.3 mg or less or 0.2 mg or less and 0 mg or more,
0.001 mg or more, 0.005 mg or more, 0.010 mg or more or 0.020 mg or
more.
[0054] (Resin Composition: Ethylene-Vinyl Alcohol Copolymer
(EVOH))
[0055] EVOH can be generally be obtained by saponifying an
ethylene-vinyl ester copolymer. EVOH makes it possible to provide
the fastener tape with non-adsorbency with respect to aromatic
components.
[0056] The content of ethylene monomer unit in the EVOH can be 10
mol % or more, 15 mol % or more, 20 mol % or more, 25 mol % or
more, 30 mol % or more or 35 mol % or more and 70 mol % or less, 60
mol % or less, 55 mol % or less, 50 mol % or less or 45 mol % or
less based on the total number of moles of ethylene monomer unit
and vinyl alcohol monomer unit in the entire EVOH.
[0057] EVOH can be generally be obtained by saponifying an
ethyl-vinyl ester copolymer. In this case, the degree of
saponification of the vinyl ester unit of the EVOH can be 90 mol %
or more, 95 mol % or more, 99 mol % or more or 100 mol %. If the
degree of saponification is high, crystallization occurs easily,
gas impermeability increases and thermal stability during melting
improves. Thus, a higher degree of saponification is generally
preferable.
[0058] A typical example of a vinyl ester is vinyl acetate and
other examples include vinyl esters such as vinyl propionate, vinyl
pivalate, vinyl valerate, vinyl caprate and vinyl benzoate. One
type of these vinyl esters may be used or two or more types may be
used as a mixture.
[0059] A mixture of EVOH, for which at least one of ethylene
content, degree of saponification and degree of polymerization
differ, may be used as EVOH. The EVOH may contain other copolymer
components within a range that does not impair the object of the
present invention. A plurality of types of these EVOH may be used
in combination.
[0060] (Resin Composition: Acid-Modified Polyolefin-Based
Resin)
[0061] The acid-modified polyolefin-based resin can be obtained by
graft polymerization of an acid to a polyolefin. The acid-modified
polyolefin-based resin is able to impart the fastener tape with
fusibility to the packaging bag. Maleic anhydride-modified
polyolefin, for example, is used for the acid-modified
polyolefin-based resin.
[0062] Polyethylene (including low density polyethylene (LDPE),
linear low density polyethylene (LLDPE), ultra-low density
polyethylene (ULDPE), medium density polyethylene and high density
polyethylene (HDPE) or polypropylene (including polypropylene (PP),
homopolymer polypropylene (homo PP), random polypropylene (random
PP) and block polypropylene (block PP) is preferably used as the
polyolefin.
[0063] A plurality of types of acid-modified polyolefin-based resin
may be used in combination.
[0064] For example, maleic anhydride-modified polyolefin obtained
by graft polymerizing 0.05 mass parts or more, 0.1 mass parts or
more, 0.3 mass parts or more, 0.5 mass parts or more or 1.0 mass
part or more and 50 mass parts or less, 30 mass parts or less, 20
mass parts or less, 10 mass parts or less or 5.0 mass parts or less
of maleic anhydride to 100 mass parts of polyolefin can be used for
the maleic anhydride-modified polyolefin. Examples of this maleic
anhydride-modified polyolefin are described in JP H9-278956 A.
[0065] <<Packaging Bag with Fastener Tape>>
[0066] The packaging bag with fastener tape is provided with a
packaging bag, provided with a non-adsorbent layer containing an
ethylene-vinyl alcohol copolymer as the innermost layer thereof,
and the aforementioned fastener tape fused to the non-adsorbent
layer of the packaging bag such that first and second strip-like
members are mutually opposed.
[0067] The packaging bag with fastener tape having the
aforementioned composition is able to demonstrate favorable
non-adsorbency as a whole packaging bag since both non-adsorbency
of the fastener tape and non-adsorbency of the packaging bag can be
realized.
[0068] <Packaging Bag>
[0069] The packaging bag is provided with a non-adsorbent layer
containing an ethylene-vinyl alcohol copolymer as the innermost
layer.
[0070] This packaging bag is composed with a packaging bag film at
least provided with a non-adsorbent layer. This packaging bag film
may also further be provided with an optional substrate layer.
[0071] (Non-Adsorbent Layer)
[0072] The non-adsorbent layer contains an ethylene-vinyl alcohol
copolymer. An ethylene-vinyl alcohol copolymer listed as an example
relating to the fastener tape can be used for the ethylene-vinyl
alcohol copolymer.
[0073] The non-adsorbent layer further containing an acid-modified
polyolefin-based resin is preferable from the viewpoint of
resulting in more preferable fusibility with the fastener tape. An
acid-modified polyolefin-based resin listed as an example relating
to the fastener tape can be used for the acid-modified
polyolefin-based resin.
[0074] (Substrate Layer)
[0075] The substrate layer is laminated onto the non-adsorbent
layer in the packaging bag film. This substrate layer imparts
suitable stiffness to the non-adsorbent layer and impermeability
that prevents the entrance of moisture or chlorine and the like
from the outside, thereby making this preferable.
[0076] A substrate layer made from polyolefin, polyvinyl chloride,
polyvinylidene chloride, polychlorotrifluoroethylene,
polytetrafluoroethylene, saturated or unsaturated polyester (such
as polyethylene terephthalate (PET) or polybutylene terephthalate),
polyamide, polyacrylonitrile or a combination thereof can be used
as this substrate layer. A substrate layer made from these
materials may be used as a single layer or laminated. A barrier
layer such as pure aluminum foil, aluminum alloy foil or an alumina
or silica deposited film may also be laminated for the purpose of
enhancing impermeability.
[0077] (Other Layers)
[0078] The packaging bag film may also optionally have other
layers. An example of other layers includes adhesive layers present
between each layer.
[0079] <<Method for Producing Packaging Bag with Fastener
Tape>>
[0080] The method of the present invention for producing a
packaging bag with fastener tape includes a fusion step for fusing
the aforementioned fastener tape to the non-adsorbent layer of the
aforementioned packaging bag film, and a bag formation step for
forming a bag by mutually opposing and fusing the ends of the
non-adsorbent layer such that the first and second strip-like
members of the fastener tape are mutually opposed.
[0081] When forming into a bag by mutually opposing and fusing the
ends of the non-adsorbent layer, at least a portion of the fastener
tape is integrally fused and collapsed together with the ends of
the non-absorbent layer between the mutually opposing ends of the
non-adsorbent layer.
[0082] The following provides an explanation of each step of the
method of the present invention for producing a packaging bag with
fastener tape with reference to FIG. 3. Although an aspect in which
the packaging bag is a bag that is sealed on three sides is
described in FIG. 3, the packaging bag may be that which is sealed
on four sides.
[0083] (Fusion Step)
[0084] The fusion step is a step for fusing the aforementioned
fastener tape to the non-adsorbent layer of the aforementioned
packaging bag film.
[0085] This step can be carried out by, for example, preparing a
packaging bag film provided with a non-adsorbent layer 200 as shown
in FIG. 3(a), followed by fusing the first strip-like member 10 and
the second strip-like member 20 to the non-adsorbent layer 200 of
the packaging bag film as shown in FIG. 3(b).
[0086] Fusion of the fastener tape may be carried out separately
from molding of the fastener tape or may be carried out
simultaneous to molding of the fastener tape. In the case of
attempting to fabricate a packaging bag that is sealed on four
sides in particular, the first and second strip-like members may
each be fused to different packaging bag films.
[0087] (Bag Formation Step)
[0088] The bag formation step is a step for forming a bag by
mutually opposing and fusing the ends of the non-adsorbent layer
such that the first and second strip-like members of the fastener
tape are mutually opposed.
[0089] This step can be carried out by, for example, mutually
opposing the ends of the non-adsorbent layer 200 such that the
first strip-like member 10 and the second strip-like member 20 of
the fastener tape 100 are mutually opposed, and particularly such
that the first strip-like member 10 and the second strip-like
member 20 mutually engage as shown in FIG. 3(c), and forming a bag
by fusing the ends of the non-adsorbent layer 200 at a sealing
portion 250 as shown in FIG. 3(d). When forming a bag by opposing
and fusing the ends of the non-adsorbent layer 200, for example, a
portion of the fastener tape 100 at a region 150 where the fastener
tape 100 overlaps with the ends can be integrally fused and
collapsed together with the ends of the non-adsorbent layer 200
between the mutually opposing ends of the non-adsorbent layer
200.
EXAMPLES
[0090] Although the following provides a detailed explanation of
the present invention using examples and comparative examples, the
present invention is not limited thereto.
Production of Resin Composition
Example 1
[0091] The resin composition of Example 1 was prepared by melt
kneading EVOH (EVAL, sold by Kuraray, ethylene monomer unit
content: 44 mol %) and maleic anhydride-modified polyolefin (ADMER,
sold by Mitsui Chemicals) with a high shear twin screw extruder at
a weight ratio of 88:12.
Examples 2 to 4 and Comparative Example 1
[0092] The resin compositions of Examples 2 to 4 and Comparative
Example 1 were prepared in the same manner as Example 1 with the
exception of changing the weight ratio of the EVOH and maleic
anhydride-modified polyolefin as shown in Table 1.
Examples 5 to 8 and Comparative Example 2
[0093] The resin compositions of Examples 5 to 8 and Comparative
Example 2 were respectively prepared in the same manner as Examples
1 to 4 and Comparative Example 1 with the exception of using EVOH
having an ethylene monomer unit content of 48 mol % (EVAL, sold by
Kuraray) instead of EVOH having an ethylene monomer unit content of
44 mol %.
Comparative Example 3
[0094] The resin composition of Comparative Example 3 was prepared
in the same manner as Example 1 with the exception of using low
density polyethylene instead of EVOH and maleic anhydride-modified
polyolefin.
Evaluation of Properties of Resin Compositions
[0095] <Melt Mass Flow Rate>
[0096] The melt mass flow rates (MFR) of the prepared resin
compositions of Examples 1 to 8 and Comparative Examples 1 to 3
determined in compliance with Method A of JIS K7210-1 were measured
under conditions of a temperature of 260.degree. C. and load of
21.18 N.
[0097] <Tensile Modulus>
[0098] Evaluation films having a thickness of 100 .mu.m were formed
with a single layer film forming machine using the prepared resin
compositions.
[0099] The formed evaluation films were cut to a width of 15 mm
followed by measurement of tensile modulus using a tensile tester
under conditions of a tensile speed of 300 mm/min.
[0100] <Sealing Strength>
[0101] Evaluation films were first formed as explained in relation
to evaluation of tensile modulus.
[0102] The evaluation films formed in the manner described above
were heat sealed under conditions of 160.degree. C., 0.2 MPa and
0.5 sec on the side of the non-adsorbent layer of a packaging bag
film provided with a non-adsorbent layer, aluminum foil as a
substrate layer and PET film in that order (Non-catch, sold by
Kyodo Printing).
[0103] Next, the heat-sealed evaluation films and packaging bag
film were cut to a width of 15 mm followed by measurement of heat
sealing strength by a T peel test using a tensile tester under
conditions of a tensile speed of 300 mm/min.
[0104] <Adsorbed Amount of L-Menthol>
[0105] Evaluation films were first formed as explained in relation
to evaluation of tensile modulus.
[0106] The evaluation films formed in the manner described above
were cut to a size of 10 cm.times.10 cm, placed in a covered Petri
dish having a diameter of 14 cm and depth of 2 cm together with 1 g
of L-menthol and exposed to L-menthol vapor (3.25 mg/cm.sup.3) for
1 week in an atmosphere at 40.degree. C., followed by extracting
the L-menthol adsorbed to the film following exposure with methyl
ethyl ketone and calculating the adsorbed amount of L-menthol by
quantifying the amount of L-menthol in the extract solution by gas
chromatography.
[0107] <<Evaluation of Fastener Tape>>
[0108] Fastener tape having an interlocking engageable structure in
which the thickness of the flange portions was about 100 .mu.m at a
width of 1.3 cm was fabricated by profile melt extrusion using the
resin composition prepared in Example 1. Fastener tape was molded
into the same form as Example 1 for the other examples and
comparative examples. Fastener tape was able to be molded for each
of the samples.
[0109] Next, packaging bags measuring 9 cm.times.17 cm were
prepared according to the method previously described in relation
to FIG. 3 using the aforementioned fastener tape and the
aforementioned packaging bag film followed by evaluation of the
parameters indicated below.
[0110] <Appearance>
[0111] The appearance of the region on the side of the packaging
bag where the fastener tape is collapsed was observed by visual
inspection. The evaluation criteria were as indicated below.
[0112] good: Collapsed favorably
[0113] bad: Convexed
[0114] <Openability>
[0115] Evaluation of openability of the prepared fastener bag was
carried out by a sensory evaluation. The evaluation criteria were
as indicated below.
[0116] good: Able to be opened easily
[0117] bad: Not able to be opened easily
[0118] The results are shown in the following Table 1. With respect
to "MFR" in Table 1, a value of ".gtoreq.220.0" indicates that an
accurate value was unable to be measured as a result of MFR having
exceeded 20.
TABLE-US-00001 TABLE 1 Composition EVOH Packaging Bag Ethylene
Acid- Composition Evaluations Evaluations Monomer Modified PO PE
Sealing Adsorbed Appearance Content in Unit Content in Content in
MFR Tensile Strength Amount of Composition Content Composition
Composition (g/10 min) Modulus (N/15 mm) (mg/ Collapsed Open- (mass
%) (mol %) (mass %) (mass %) 260.degree. C. (N/mm.sup.2)
160.degree. C. 100 cm.sup.2) Portion ability Ex. 1 88 44 12 -- 5.40
835.3 23.7 0.03 good good Ex. 2 80 44 20 -- 3.33 693.1 22.1 0.09
good good Ex. 3 70 44 30 -- 2.07 529.7 20.1 0.16 good good Ex. 4 60
44 40 -- 0.49 413.9 22.4 0.57 bad good Ex. 5 88 48 12 --
.gtoreq.20.0 843.2 22.0 0.10 good good Ex. 6 80 48 20 --
.gtoreq.20.0 757.5 20.0 0.17 good good Ex. 7 70 48 30 --
.gtoreq.20.0 597.6 24.1 0.13 good good Ex. 8 60 48 40 --
.gtoreq.20.0 547.5 24.1 0.22 good good Comp. 100 44 -- -- 11.3
1101.2 16.1 0.02 good bad Ex. 1 Comp. 100 48 -- -- .gtoreq.20.0
1230.6 18.0 0.20 good bad Ex. 2 Comp. -- -- -- 100 5.44 281.2
(unsealable) 14.3 good good Ex. 3
[0119] It can be understood from Table 1 that the fastener tape
prepared using the resin compositions of Examples 1 to 8 are able
to be fused with sufficient strength so as to withstand opening of
the packaging bag, have non-adsorbency with respect to aromatic
components, and demonstrate favorable openability.
[0120] Among these, packaging bags with fastener tape prepared
using the resin compositions of Examples 1 to 3 and Example 5 to 8,
in which MFR was 1.0 or more, can be understood to allow the
obtaining of favorable sealability as a result of being able to be
favorably collapsed during bag production.
[0121] <Evaluated Values of L-Menthol Adsorption by Packaging
Bags with Fastener Tape>
[0122] The amounts of L-menthol adsorbed for an entire packaging
bag with fastener tape of a prescribed size were estimated using
the amount of L-menthol adsorbed by the resin compositions as
previously described.
[0123] Estimation was carried out by assuming use of the packaging
bag with fastener tape indicated below.
[0124] Size of portion housing contents: 10 cm.times.15 cm
[0125] Fastener tape: 10 cm long.times.1.3 cm wide
[0126] A region corresponding to a width of 0.65 cm equal to half
of the width of 1.3 cm of the aforementioned fastener tape was
assumed to make contact with the contents of the packaging bag.
[0127] The areas of the portion of the fastener tape in the
packaging bag and the region of the non-adsorbent layer of the
packaging bag that contacts the contents were as indicated
below.
[0128] Fastener tape: 0.65 cm.times.20 cm=13 cm.sup.2
[0129] Non-adsorbent layer of packaging bag: 14.35 cm.times.20
cm=287 cm.sup.2
[0130] The adsorbed amount of L-menthol for the entire packaging
bag was calculated using the aforementioned values and the adsorbed
amount of L-menthol of the resin composition.
Amount adsorbed by fastener tape (mg)=non-adsorbency of fastener
tape (mg/100 cm.sup.2).times.area of fastener tape portion
(cm.sup.2)/100
Amount adsorbed by non-adsorbent layer (mg)=non-adsorbency of
non-adsorbent layer (mg/100 cm.sup.2).times.area of non-adsorbent
layer portion (cm.sup.2)/100
Total adsorbed amount (mg)=Amount adsorbed by fastener tape
(mg)+amount adsorbed by non-adsorbent layer (mg)
[0131] Non-adsorbency of the non-adsorbent layer was evaluated in
the same manner as the aforementioned non-adsorbency of the resin
compositions.
[0132] The results of the calculations are shown in the following
Table 2.
TABLE-US-00002 TABLE 2 Amount Amount Non-adsorbent Adhered by
Adhered by Total Evaluation of Packaging Bag Fastener Tape Layer
Fastener Non-adsorbent Amount Appearance of Non-adsorbency
Non-adsorbency Tape Layer Adsorbed Collapsed Fastener Tape (mg/100
cm.sup.2) (mg/100 cm.sup.2) (mg) (mg) (mg) Portion Openability
(Absence of -- 0.02 -- 0.060 0.060 -- -- Fastener Tape) Ex. 1 0.03
0.02 0.004 0.057 0.061 good good Ex. 2 0.09 0.02 0.012 0.057 0.069
good good Ex. 3 0.16 0.02 0.020 0.057 0.078 good good Ex. 4 0.57
0.02 0.074 0.057 0.131 bad good Ex. 5 0.10 0.02 0.013 0.057 0.071
good good Ex. 6 0.17 0.02 0.022 0.057 0.079 good good Ex. 7 0.13
0.02 0.017 0.057 0.074 good good Ex. 8 0.22 0.02 0.029 0.057 0.086
good good Comp. Ex. 1 0.02 0.02 0.003 0.057 0.060 good bad Comp.
Ex. 2 0.20 0.02 0.026 0.057 0.083 good bad Comp. Ex. 3 14.3 0.02
1.859 0.057 1.916 good good
[0133] It can be understood from Table 2 that, in the case of
having used the resin composition of Comparative Example 3, which
does not have adequate non-adsorbency, even if a packaging bag is
used that has non-adsorbency, adequate non-adsorbency is unable to
be obtained for the packaging bag with fastener tape overall.
[0134] In contrast, in can be understood that, in the case of
having used another resin composition having adequate
non-adsorbency, when a packaging bag is used that has
non-adsorbency, adequate non-adsorbency is obtained for the
packaging bag with fastener tape overall.
REFERENCE SIGNS LIST
[0135] 10 First strip-like member [0136] 12 Engageable portion
[0137] 20 Second strip-like member [0138] 22 Engageable portion
[0139] 100 Fastener tape [0140] 200 Non-adsorbent layer of
packaging bag film [0141] 250 Sealing portion [0142] 300 Packaging
bag
* * * * *