JP5088004B2 - Multi-chamber plastic pouch with peelable seal - Google Patents

Description

  The present invention relates to a multi-chamber plastic pouch having a peelable seal portion. The plastic pouch of the present invention separates powder and liquid by a peelable seal portion and stores them in a storage chamber, presses the pressure seal during use to open the peelable seal portion, communicates the storage chamber and mixes the contents. It is suitably used as a multi-chamber pouch to be used.

  A multi-chamber pouch partitioned by a peelable seal that can communicate with a plurality of storage chambers reacts and deteriorates when stored in a state where each component is mixed in advance, for example, medical infusion solution and its solution, powder for injection It is used to separate and store contents such as preparations and their solutions, seasonings, and mixed adhesives. These containers can be easily mixed without adjusting the mixing ratio at the time of use, and can prevent the introduction of foreign substances from the outside, so that the demand for various uses such as medical use is increasing. Things have been proposed.

  In such plastic pouches, when the contents are separated by a peelable seal portion and filled in the respective storage chambers, or when the pouches sealed after filling the contents are distributed or stored, they can be peeled off by impact such as dropping. In addition to preventing separation and communication of the partition portion formed of the seal portion, it is required that when the pouch is used, the pouch is pressed so that the peelable seal portion is easily peeled and communicated to be mixed.

Conventionally, as a method of constructing such a peelable seal part of a pouch, (1) the inner surface of the packaging material constituting the pouch is composed of a mixture of different types of resins having different compatibility with the polyolefin resin, and the peripheral seal A difference is provided in the seal strength by changing the heat sealing conditions of the part and the peelable seal part (see Patent Document 1). (2) The inner layer resin layer of the front and back packaging materials constituting the pouch and the pouch are separate. A method has been proposed in which a peelable seal portion is formed by heat-sealing the same kind of sealing material as the inner resin layer of the packaging material (see Patent Documents 2 to 4).
JP-A-2-4671 No. 8-5708 Japanese Patent Laid-Open No. 11-227841 Japanese Unexamined Patent Publication No. 4-977751

However, in the above method (1), it is difficult to adjust the sealing strength of the peelable seal part using a resin obtained by blending a polyethylene resin and a different resin as the inner resin layer of the packaging material. With a resin, it is difficult to satisfy both the low-temperature sealing property and the impact resistance, and furthermore, there is a possibility that the flavor property is impaired by the elution of the blend resin. In addition, the method (2) has solved the problems of seal strength adjustment and flavor properties, but the problem that the peelable seal part peels off during high-temperature processing such as hot-packing or boiling of the contents is solved. I couldn't.
And, in these conventional peelable seal parts, the peelable seal part is easy to peel off during distribution and storage of the pouch, and in a small size pouch with a small amount of contents, the seal strength of the peelable seal part is too strong, It may be difficult to peel off the peelable seal part during use after refrigerated storage. Further, when the seal portion is peeled, there is a problem that the pouch or the seal material extends and the beard-like fine fibers are detached, or the peeled surface is whitened to cause an appearance defect.

  Therefore, the present invention eliminates these problems of the prior art, and when filling the contents in the multi-chamber pouch at high temperature, during boil sterilization, during the distribution of the pouch sealed after filling the contents, peeling during storage A plastic pouch having a peelable seal portion that can prevent peeling of a partition portion made of a peelable seal portion and can be easily communicated and mixed when using a pouch after refrigerated storage. The purpose is to provide.

In the present invention, the following configurations 1 to 8 are employed to solve the above-described problems.
1. In a multi-chamber plastic pouch having a peelable sealing part configured by heat-sealing a front and back packaging material constituting the pouch and a separate sealing material, the inner layer of the front and rear packaging materials constituting the pouch is a linear low density polyethylene A first layer comprising a propylene-ethylene-butene terpolymer, a blend A of low density polyethylene and linear low density polyethylene; a propylene ethylene random copolymer and a wire A multi-chamber plastic pouch having a communicable peelable seal portion, characterized in that it is constituted by a laminate of a second layer made of a blend B of low-density polyethylene in a shape .
2. 2. The multi-chamber plastic pouch according to 1, wherein the linear low-density polyethylene constituting the inner layer of the packaging material is a copolymer of ethylene and an α-olefin having 6 or more carbon atoms.
3. The separate sealing material is made of a propylene ethylene random copolymer and a linear low density polyethylene having a larger blend ratio of the linear low density polyethylene than the blend B constituting the second layer outside the second layer. 3. The multi-chamber plastic pouch according to 1 or 2, wherein the multi-chamber plastic pouch is configured by a laminate provided with a third layer made of the blend C.
4). The multi-chamber plastic pouch according to any one of 1 to 3, wherein the peelable seal portion is peeled off by delamination between the first layer and the second layer of the sealing material .
5. The multi-chamber plastic pouch according to any one of 1 to 4, wherein the delamination strength of the sealing material is 8 N / 15 mm or less .
6). The peelable sealing portion is formed by heat-sealing a sealing material separate from the front and back packaging materials constituting the pouch from the second layer side of the sealing material . The multi-chamber plastic pouch according to any one of 5 .
7). The multi-chamber plastic pouch according to any one of claims 1 to 6 , wherein the peel strength between the inner layer of the front and back packaging materials constituting the peelable seal portion and the separate seal material is 15 N / 15 mm or more .
8). The multi-chamber plastic pouch according to any one of 1 to 7 , wherein the sub chamber is formed by branching from a side wall of the main chamber, and a peelable seal portion is provided in the vicinity of the branch portion in the sub chamber .

  According to the present invention, in a multi-chamber pouch that separates and stores powder and liquid, presses them during use, opens the peelable seal portion, communicates the storage chamber, and mixes the contents. It is possible to prevent the peelable seal part from being peeled off due to high temperature treatment when filling the contents, or stress during distribution or storage of the pouch sealed after filling the contents. Further, when the pouch is used, the peelable seal portion can be peeled off by pressing with a finger or the like, and the separated storage chamber can be easily communicated.

Next, preferred embodiments of the present invention will be described in detail with reference to the drawings. When the plastic pouch of the present invention is configured as a multi-chamber pouch, the terms main chamber and sub chamber may be used, but these terms are merely used to distinguish a plurality of storage chambers. The terms “main” and “sub” do not represent the size relationship between the storage rooms.
1 to 3 are diagrams showing an example in which the present invention is applied to a multi-chamber pouch. FIG. 1 is a plan view showing a state in which the pouch is opened before filling contents, and FIG. 2 is a pouch after filling contents. FIG. 3 is a schematic cross-sectional view showing a state in which the multi-chamber pouch is folded after filling the contents.

In this multi-chamber pouch 1, a sub chamber 2 and a main chamber 3 are provided so as to be adjacent in the same plane, and the sub chamber 2 and the main chamber 3 are partitioned by a peelable seal portion 4. The subchamber 2 of the multi-chamber pouch 1 is filled with a solid material such as an injection powder formulation, and the main chamber 3 is filled with a solution of the solid material. The multi-chamber pouch 1 is filled with the contents in the sub chamber 2 and the main chamber 3, and then bent as shown in FIG. 3 and fixed with the fixing portion 8 provided on the peripheral seal portion 6 to be transported and stored as it is. can do.
When the multi-chamber pouch is used, when the multi-chamber pouch 1 is expanded and the main chamber 3 is pressed (arrow 30) as shown in FIG. 2, the pressure is transmitted by the contents in the main chamber 3. As a result, the peelable seal 4 is broken, and the contents of the main chamber 3 flow into the sub chamber 2 to obtain a mixed solution of the contents stored in both chambers. The obtained mixed solution is led out from the spout 7.

  The peelable seal portion 4 of the multi-chamber pouch 1 is formed by heat-sealing the pouch wall materials 9, 10 and a seal material 15 separate from these wall materials (see FIG. 2). The inner layers of the front and back wrapping materials constituting the pouch 1 are made of linear low density polyethylene, while the separate sealing material 15 is made of polypropylene resin.

As the linear low density polyethylene constituting the inner layer of the wall material 9 or 10 of the pouch, it is possible to use a copolymer of ethylene and an α-olefin having 6 or more carbon atoms and the wall material 9 and 10 and the seal material 14. 15 is preferable in that the desired seal strength can be obtained.
Although it has already been proposed that the inner layer of the packaging material constituting the peelable seal portion is made of linear low density polyethylene (LLDPE) and the separate sealing material is made of a polyolefin resin (Patent Document 2), When the inner layer is made of LLDPE, which is a copolymer of ethylene and α-olefin having 4 carbon atoms, it is difficult to adjust the peel strength with the sealing material to a desired range, and so far hot pack and boil treatment It has been difficult to stably realize a peelable seal portion that can withstand such a high-temperature treatment. In the present invention, linear low density polyethylene (LLDPE), in particular, LLDPE of a copolymer of ethylene and an α-olefin having 6 or more carbon atoms, is used as a resin constituting the inner layer of the packaging material. It has succeeded in reliably realizing a peelable seal portion that can withstand.

  As a copolymer of ethylene and an α-olefin having 6 or more carbon atoms, ethylene is the main component, and the α-olefin which is a minor component is hexene-1, octene-1, dodecene-1, 4-methylpentene. -1 or the like. In addition, the above-mentioned LLDPE is preferable because LLDPE obtained with a metallocene catalyst system is superior in impact resistance, has fewer soluble components, and is excellent in blocking resistance than LLDPE obtained in a Ziegler catalyst system.

4 and 5 are schematic cross-sectional views showing examples of separate sealing materials constituting the peelable seal portion of the multi-chamber plastic pouch of the present invention.
4 includes a second layer 26 made of a blend B of a propylene ethylene random copolymer and a linear low density polyethylene, a terpolymer of propylene-ethylene-butene, a low density polyethylene and a linear material. It is composed of a two-layer laminate composed of a first layer 25 composed of a blend A of low density polyethylene. In the peelable seal portion using the seal material 14, the peelable seal portion is delaminated between the first layer 25 and the second layer 26 of the seal material 14 or the first depending on the material configuration of the peelable seal portion. Peeling occurs due to cohesive failure in the layer 25 or interface peeling between the pouch wall material 10 and the first layer 25.
The blend ratio of each component in the blend A constituting the first layer 25 is 65 to 75% by weight of propylene-ethylene-butene terpolymer (80 to 95% by weight of propylene, 1 10% by weight and 1 to 10% by weight of butene), the total of the low density polyethylene and the linear low density polyethylene is preferably about 25 to 35% by weight. Moreover, it is preferable that the mixture ratio in the blend B which comprises the 2nd layer 26 shall be about 51-60 weight% of propylene ethylene random copolymers, and about 40-49 weight% of linear low density polyethylene.

The sealing material 15 in FIG. 5 is a third layer composed of a blend C of a propylene ethylene random copolymer and a linear low density polyethylene having a larger blend ratio of the linear low density polyethylene than the blend B constituting the second layer. 27; second layer 26 comprising a blend B of propylene ethylene random copolymer and linear low density polyethylene; and a blend of propylene-ethylene-butene terpolymer, low density polyethylene and linear low density polyethylene The first layer 25 made of A is composed of a three-layer laminate. The blending ratio in the blend C constituting the third layer 27 is about 40 to 50% by weight of the propylene ethylene random copolymer and about 50 to 60% by weight of the linear low density polyethylene. It is preferable in that the property is improved.
In the peelable seal portion using the sealing material 15, the peeling is performed by delamination between the first layer 25 and the second layer 26 of the sealing material 15.

  The first layer 25 made of the pouch wall material 10 and the blend A forms a tight seal portion. Similarly, the pouch wall material 9 and the third layer 27 must also form a tight seal portion, but the pouch wall material 9 made of linear low density polyethylene, the propylene ethylene random copolymer, and the linear low density. Since the third layer 27 made of the polyethylene blend C is a different material, it is difficult to form a tight seal portion having an appropriate seal strength. Therefore, in order to make the pouch wall material 9 and the third layer 27 a tight seal portion, the pouch wall materials 9 and 10 may be a copolymer of ethylene and an α-olefin having 6 or more carbon atoms. preferable.

FIG. 6 is a schematic diagram for explaining an example of the cross-sectional structure of the peelable seal portion 4, and FIG. 6A heats the sealing material 15 illustrated in FIG. 5 constituting the inner wall of the pouch and the peelable seal portion 4. It is a figure explaining the process of sealing and forming the peelable seal | sticker part 4. FIG. Moreover, the figure (B) is a figure explaining the state which the peelable seal | sticker part 4 peels.
In this example, as shown in FIG. 6A, when heat sealing the inner wall of the pouch and the sealing material 15 constituting the peelable sealing portion 4 from the wall material 9 side, the heat sealing pressure is increased to increase the pouch. The wall material 9 is melted to form a wall reservoir 20 of the wall material 9 on the seal material unsealed portion 22 on the communication side (the side on which the peeling force acts) between the wall material 9 and the third layer 27. . Then, as shown in FIG. 6 (B), the formation of the pool 20 prevents the interface peeling between the wall material 9 of the pouch and the third layer 27, and the stress that peels off the peelable seal portion 4 is increased. It acts between the wall material 10 of the pouch and the first layer 25 of the sealing material 15, and the delamination between the first layer 25 and the second layer 26 can be easily performed.

The seal material unsealed portion 22 is formed on both outer sides of the seal material 15 of the peelable seal portion 4 when the seal material 15 is used and the peelable seal portion 4 is formed by heat sealing. By leaving the seal material unsealed portion 22, the peelable seal portion 4 can be easily and reliably formed.
In the peelable seal portion 4 of the multi-chamber plastic pouch of the present invention, the seal material can be opened with an interlayer peel strength of 8 N / 15 mm or less, and the peel strength of the seal portion (tight seal portion) between the seal material and the wall material can be increased. The peelable seal portion 4 is preferably peeled off by delamination of the sealing material 15 at 15 N / 15 mm or more.

  In the present invention, the peelable seal portion 4 is configured as described above so that the high temperature treatment when filling the contents into the storage chamber of the multi-chamber pouch, the circulation of the pouch sealed after filling the contents, The peelable seal portion can be prevented from being peeled off due to stress during storage, and the peelable seal portion 4 can be easily communicated with the contents stored in the main chamber 3 and the subchamber 2 when the pouch is used. A plastic pouch can be obtained.

The plastic pouch of the present invention is composed of a single layer or a multilayer plastic film, and the inner layer is composed of a linear low density polyethylene, preferably a copolymer of ethylene and an α-olefin having 6 or more carbon atoms. . There is no restriction | limiting in particular as another plastic material which comprises a multilayer plastic film, What is normally used for a pouch can be used.
Other plastic materials suitable for forming a multilayer plastic film include, for example, crystalline polypropylene, crystalline propylene-ethylene copolymer, crystalline polybutene-1, crystalline poly-4-methylpentene-1, low Polyolefins such as-, medium-, or high-density polyethylene, ethylene-vinyl acetate copolymer (EVA), EVA saponified product, ethylene-ethyl acrylate copolymer (EEA), ion-crosslinked olefin copolymer (ionomer) Aromatic vinyl copolymers such as polystyrene and styrene-butadiene copolymers; vinyl halide polymers such as polyvinyl chloride and vinylidene chloride resins; polyacrylic resins; acrylonitrile-styrene copolymers, acrylonitrile-styrene-butadiene; Nitrile polymers such as copolymers; nylon 6 Polyamides such as nylon 66, para or metaxylylene adipamide; polyesters such as polyethylene terephthalate and polytetramethylene terephthalate; various polycarbonates; fluororesins; thermoplastic resins such as polyacetals such as polyoxymethylene Can do.
Films made of these plastic materials are used as unstretched or uniaxially or biaxially stretched films.

The plastic film used for the pouch of the present invention can also be constituted by laminating one or more of the plastic films described above and a metal foil such as aluminum, paper, cellophane and the like.
In particular, in the case of contents that require gas barrier properties, a resin having a resin layer such as polyvinylidene chloride resin, EVA saponified product, nylon or cyclic olefin copolymer, or a metal oxide deposited film such as aluminum or silicon oxide. It is preferable to use a laminated film including a layer and a metal foil such as aluminum. When manufacturing these laminated films, an anchoring agent made of an epoxy resin, a urethane resin, a polyethyleneimine resin, or the like can be interposed between the respective layers as necessary.

In order to give rigidity and heat insulation to the film constituting the pouch, it is also possible to use films made of foams of various synthetic resins. In addition, additives such as titanium oxide, calcium carbonate, and carbon can be added to various synthetic resins. A filled film can also be used. Whether the plastic film is a single layer or what kind of layer configuration it may be selected according to the properties of the contents filled in the pouch.
The plastic film can be produced by a usual method such as a casting method, a T-die method, a calendar method, or an inflation method. The laminated film can be produced by a conventional method such as dry lamination of a film formed in advance, coating on a base film, melt coextrusion or the like.

Next, another embodiment of the plastic pouch of the present invention will be further described with reference to the drawings.
7 to 9 are views showing other examples of the plastic pouch of the present invention, FIG. 7 is a perspective view of the pouch, FIG. 8 is a longitudinal sectional view of the pouch after filling the contents, and FIG. 9 is a peelable seal. It is a longitudinal cross-sectional view explaining the state which opens the part 4. FIG.
This pouch 21 is a kind of so-called standing pouch, and the pouch is made self-supporting when the contents are filled by heat-sealing the bottom member 19 constituting the bottom of the pouch to the pouch side wall.
In this pouch 21, the sub chamber 2 is formed as a small chamber branched by extending the side wall of the main chamber 3 constituting the pouch body outward, and the peelable seal portion is located near the branch portion 5 in the sub chamber 2. 4 is provided. At the center of the front end of the sub chamber 2, a spout 7 made of a plug for pouring the contents when the pouch 21 is used is provided.

The main chamber 3 and the sub chamber 2 are filled with liquid contents. The contents of the main chamber 3 are filled from the top 18 of the pouch and sealed by heat sealing. The sub chamber 2 side may be filled from the plug body 7, or an unsealed portion may be provided at the lower end portion or the side edge portion and filled from there. Further, after filling the contents from the end of the sub chamber 2, the plug serving as the spout 7 may be attached by heat sealing.
In the pouch 21, the bottom member 19 is made of a transparent plastic material so that the inside of the pouch can be seen through. Instead of using the transparent bottom member 19, or together with the transparent bottom member 19, a see-through window that allows the inside to be seen through may be provided in the main chamber 3 or the sub-chamber 2 of the pouch.

  When this pouch 1 is used, as shown in FIG. 9, the sub-chamber 2 along the main chamber 3 is opened to the top 18 side of the pouch with the branch portion 5 as a fulcrum, and conversely the top of the pouch. 18 is bent along the main storage chamber 3 side and placed on a flat table. In this state, when the main chamber 3 of the pouch is crushed by hand, the main chamber 3 and the sub chamber 2 are linear, so that the internal pressure of the main chamber 3 is applied to the end of the peelable seal portion 4 as a peeling force. Acting, the peelable seal portion 4 is peeled, the main chamber 3 and the sub chamber 2 communicate with each other, and the contents are mixed.

FIG. 10 is a perspective view showing still another example of the plastic pouch of the present invention. In this pouch 31, in the pouch 21 of FIGS. 7-9, the spout 7 is provided in the top part 18 of the pouch 31, and both the side parts of the main chamber 3 and the subchamber 2 are diameter-reduced inside. Other configurations of the pouch 31 are the same as the pouch 21.
In this pouch 31, the main chamber 3 is pressed to peel the peelable seal portion 4, and the powdery or granular solid material stored in the sub chamber 2 is dissolved by the solution stored in the main chamber 3. Pour out from spout 7 made of spout. The pouch 31 contains a powdery or granular supplement in the sub chamber 2 and the solution in the main chamber 3, and the peelable seal portion 4 is peeled off from the main chamber 3 side to dissolve the supplement. After that, the dissolved liquid is suitably used as a pouch for drinking from the spout 7.

EXAMPLES Next, the present invention will be further described with reference to examples, but the following specific examples are not intended to limit the present invention.
1. Plastic Pouch As the plastic pouch, the pouch shown in FIG. 10 is used, and the sealing material 15 made of a tape-like film piece having a width of 15 mm and a length of 90 mm is used. A branch type plastic pouch 31 in which the peelable seal part 4 was provided in the vicinity of the branch part 5 of the sub chamber was heat sealed with a width of 10 mm leaving the unsealed part 22.

2. Measurement, Test (1) Measurement of Opening Force of Peelable Seal 4 The main chamber 3 of the plastic pouch is filled with 400 g of water and the subchamber 2 is filled with 50 g of flour. The main chamber 3 and the subchamber 2 are opened, and the main chamber 3 is opened. With a Tensilon type tester (UCT-5T manufactured by TS Engineering Co., Ltd.), a steel disk with a diameter of 90 mm and a thickness of 10 mm is placed at the approximate center position of the main chamber 3, and the speed is 300 mm / The maximum load until the sealing material delaminates or cohesively breaks was measured, and this was defined as the opening force (N) of the peelable seal portion 4.
The number of measurements was 5 bags each, and the average value was measured.
Moreover, the reference | standard of the said opening force (N) 250-350N which is the result of having measured the opening force about the commercially available two-chamber infusion bag which has the shape shown in FIG. 1, and provided the conventional peelable seal part, and From the description that the average value of the pressing force that the person continuously pushes down in the standing posture for about 3 seconds is about 250 N [Matsushita Electric Engineering Technical Report 21 (1980)], the target value of the opening force of the pouch was set to 200 N or less.

(2) T-peel test of tight seal part The peelable seal part 4 of the plastic pouch is cut out with a width of 15 mm in the opening direction, and the unsealed part 22 and the wall material 10 are fixed with tape so that the peelable seal part does not peel off. . Using a Shimadzu precision universal testing machine Autograph (manufactured by Shimadzu Corp., AG-IS), a T peel test was performed at a speed of 300 mm / min. The maximum point load when T-peel peeling of the seal portion (tight seal portion) between the wall material 9 and the seal material 15 was measured, and this was used as the T-peel load on the wall material 9 side. The number of measurements was 5 each, and the wall material 9 and the sealing material 15 were firmly sealed and the film stretched was regarded as material breakage, and it was judged that 15 N / 15 mm or more was secured.

(3) Drop test The plastic pouch was dropped horizontally from a height of 120 cm above the ground onto a concrete surface at 5 ° C. with the main chamber 3 and the subchamber 2 folded and the main chamber 3 facing down. While repeating this 10 times, the presence or absence of peeling of the peelable seal portion 4 was visually observed.
In this drop test, the number of plastic pouches tested was 5 bags each.

(4) Detachment confirmation after hot pack Using a spout filling machine (Toyo Kikai, TT-15C), 400 ml of 85 ° C hot water is filled from the spout 7 to the main chamber 3 in 0.6 seconds, and then the spout filling machine The presence or absence of peeling of the peelable seal portion 4 of the plastic pouch taken out from the outlet was visually observed and evaluated according to the same criteria as the drop test.
In this hot pack test, the number of plastic pouches tested was 10 bags each.

(5) Confirmation of peeling after boil sterilization After filling 400 ml of water in the main chamber 3 and 50 g of flour in the subchamber 2, the plastic pouch is submerged in a pan containing hot water at 85 ° C. to 90 ° C. for 30 minutes, It cooled, the presence or absence of peeling of the peelable seal | sticker part 4 was observed visually, and the same reference | standard as a drop test evaluated.
In this hot pack test, the number of plastic pouches tested was 5 bags each.

In the drop test, peeling confirmation after hot pack, and peeling confirmation after boil sterilization, the state of the peelable seal portion 4 was evaluated according to the following criteria.
・ No peeling of peelable seal part: ○
・ There is complete or partial peeling of the peelable seal part: ×
In addition, even if one bag out of the number of plastic pouches tested, a part of the peelable seal part that was partially retracted or completely peeled off was marked as x.

[Example 1]
As a packaging material constituting the pouch, a biaxially stretched polyethylene terephthalate film (thickness: 12 μm), a biaxially stretched nylon film (thickness: 15 μm) from the outer layer, a line made of a copolymer of ethylene and an α-olefin having 6 carbon atoms. A multilayer film obtained by laminating a thin low density polyethylene film (thickness: 100 μm) (L-4102 manufactured by Toyobo Co., Ltd.) with a urethane adhesive was used. As the sealing material 15 constituting the peelable seal portion 4, a first layer 25: a propylene-ethylene-butene terpolymer, a blend layer of low density polyethylene and linear low density polyethylene (thickness 10 μm), second layer Layer 26: blend layer of propylene ethylene random copolymer and linear low density polyethylene (thickness 30 μm), third layer 27: propylene ethylene random copolymer having a blend ratio of linear low density polyethylene larger than that of the second layer A tape-like film piece having a width of 15 mm made of a three-layer film having a total thickness of 50 μm (allomer film TLP5 manufactured by Okamoto Co., Ltd.) composed of a blend layer (thickness: 10 μm) of linear low density polyethylene was used.
The pouch was filled with the contents, and the above measurements, tests and evaluations were performed.

[Example 2]
As the inner resin layer of the packaging material constituting the plastic pouch, a linear low-density polyethylene film of a different type from that of Example 1 made of a copolymer of ethylene and an α-olefin having 6 carbon atoms (Futamura Chemical Co., Ltd.) A plastic pouch was produced in the same manner as in Example 1 except that LL-XMTN) was used, and the pouch was filled with the contents, and measurement, test and evaluation were conducted in the same manner as in Example 1.

[Example 3]
Implementation was performed except that a linear low density polyethylene film (SG815L manufactured by Tamapoly Co., Ltd.) made of a copolymer of ethylene and an α-olefin having 8 carbon atoms was used as the inner resin layer of the packaging material constituting the plastic pouch. A plastic pouch was produced in the same manner as in Example 1, the contents were filled in this pouch, and measurement, test and evaluation were conducted in the same manner as in Example 1.

[Example 4]
As the inner resin layer of the packaging material constituting the plastic pouch, a linear low density polyethylene film (KF201, KF Film Co., Ltd.) made of a copolymer of ethylene and an α-olefin having 4 carbon atoms was used. Manufactured a plastic pouch in the same manner as in Example 1, filled with the contents, and measured, tested and evaluated in the same manner as in Example 1.

[Comparative Example 1]
As the sealing material 15 constituting the peelable sealing portion 4, the first layer 25: a blend layer of polyethylene and polypropylene, the second layer 26: a polyethylene layer, and a third layer 27: a polyethylene layer 3 having a total thickness of 35 μm A plastic pouch was produced in the same manner as in Example 1 except that a tape-like film piece made of a layer film (DIFREN E7300T manufactured by Dainippon Ink & Chemicals, Inc.) was used, and the contents were filled in this pouch. Measurements, tests and evaluations were carried out in the same manner as in Example 1.

[Comparative Example 2]
As the sealing material 14 constituting the peelable seal portion 4, a two-layer film (J) having a total thickness of 50 μm composed of a first layer 25: a blend layer of low density polyethylene and polystyrene, and a second layer 26: a low density polyethylene layer. A plastic pouch was produced in the same manner as in Example 1 except that a tape-like film piece made of SMX-Y04 manufactured by Film Co., Ltd. was used, and the contents were filled in this pouch and measured in the same manner as in Example 1. Tested and evaluated.
Table 1 shows the results obtained in the above examples and comparative examples.

  As is apparent from Table 1 above, the multi-chamber plastic pouch of the present invention is excellent in peelability of the peelable seal part during use, and excellent in drop strength, peel resistance of hot packs and boil sterilization. It has been found. In Example 4, since the seal strength of the tight seal portion between the wall material and the resin lower layer 27 is 15 N / 15 mm or less, the opening force of the peelable seal portion is slightly increased, but when using a pouch It was possible to open with normal pressure, and it was not a problem.

It is a top view which shows an example of the plastic pouch of this invention. It is a cross-sectional schematic diagram which shows the state which filled the content in the pouch of FIG. It is a cross-sectional schematic diagram which shows the state which filled the content in the pouch of FIG. 1, and was bent. It is a cross-sectional schematic diagram which shows an example of the separate sealing material which comprises a peelable seal part. It is a cross-sectional schematic diagram which shows the other example of the separate sealing material which comprises a peelable seal part. It is a cross-sectional schematic diagram which shows the state which heat seals the sealing material which comprises a pouch inner wall and a peelable seal part, and the state from which a peelable seal part peels. It is a perspective view which shows an example which applied this invention to the standing pouch. It is a longitudinal cross-sectional view which shows the state which filled the content in the pouch of FIG. It is sectional drawing which shows the state which opens the peelable seal part of the pouch of FIG. It is a perspective view which shows the other example which applied this invention to the standing pouch.

Explanation of symbols

1,21,31 Plastic pouch 2 Sub chamber 3 Main chamber 4 Peelable seal 5 Branch 6 Perimeter seal 7 Spout 8 Fixing
9,10 Wall material
14,15 Sealing material 18 Pouch top 19 Bottom member 20 Meat reservoir 23 Heat seal direction 25 First layer 26 Second layer 27 Third layer

Claims (8)

In a multi-chamber plastic pouch having a peelable sealing part configured by heat-sealing a front and back packaging material constituting the pouch and a separate sealing material, the inner layer of the front and rear packaging materials constituting the pouch is a linear low density polyethylene A first layer comprising a propylene-ethylene-butene terpolymer, a blend A of low density polyethylene and linear low density polyethylene; a propylene ethylene random copolymer and a wire A multi-chamber plastic pouch having a communicable peelable seal portion, characterized in that it is constituted by a laminate of a second layer made of a blend B of low-density polyethylene in a shape .   The multi-chamber plastic pouch according to claim 1, wherein the linear low density polyethylene constituting the inner layer of the packaging material is a copolymer of ethylene and an α-olefin having 6 or more carbon atoms. The separate sealing material is made of a propylene ethylene random copolymer and a linear low density polyethylene having a larger blend ratio of the linear low density polyethylene than the blend B constituting the second layer outside the second layer. The multi-chamber plastic pouch according to claim 1 or 2, wherein the multi-chamber plastic pouch is configured by a laminated body provided with a third layer made of the blend C. The multi-chamber plastic pouch according to any one of claims 1 to 3, wherein the peelable seal portion is peeled off by delamination between the first layer and the second layer of the sealing material . The multi-chamber plastic pouch according to any one of claims 1 to 4, wherein the delamination strength of the sealing material is 8 N / 15 mm or less . The peelable seal portion is formed by heat-sealing a sealing material separate from the front and back packaging materials constituting the pouch from the second layer side of the sealing material. The multi-chamber plastic pouch according to any one of 1 to 5 . The multi-chamber plastic according to any one of claims 1 to 6 , wherein the peel strength between the inner layer of the front and back packaging materials constituting the peelable seal portion and the separate seal material is 15 N / 15 mm or more. Pouch. The multi-chamber plastic pouch according to any one of claims 1 to 7 , wherein the sub chamber is formed by branching from a side wall of the main chamber, and a peelable seal portion is provided in the vicinity of the branch portion in the sub chamber .

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