JP2023081212A - Lamination peeling container - Google Patents

Abstract

To propose a lamination peeling container that can improve transparency while maintaining squeezability and gas barrier property of the conventional trunk part.SOLUTION: A lamination peeling container 100 according to the present disclosure is the lamination peeling container 100 including an outer layer body 21 and an inner layer body 22 laminated on an inner surface of the outer layer body 21 in a peelable manner and free in volume-reducing deformation, and has a bottle shape having a cylindrical mouth part 10, a trunk part 20 formed below the mouth part 10 and elastically deformable by pressing, and a bottom part 40 that closes a lower end part of the trunk part 20. An outside air introduction hole 10c for introducing the outside air into a space between the outer layer body 21 and the inner layer body 22 is formed in the outer layer body 21. The outer layer body 21 has a first ionomer resin layer 21a forming the outermost layer of a base material, and the inner layer body 22 has a second ionomer resin layer 22a forming the innermost layer of the base material.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present disclosure relates to a delamination container including an outer layer body having a mouth portion, a body portion and a bottom portion, and an inner layer body detachably laminated and arranged inside the outer layer body.

Conventionally, as a container for storing contents such as food and cosmetics, an outer layer has a cylindrical mouth, a cylindrical body connected to the bottom of the mouth, and a bottom closing the lower end of the body. A lamination-peelable container is used which includes a body and an inner layer body provided inside the outer layer body for containing a content, and in which the inner layer body can be peeled inwardly from the outer layer body (see, for example, Patent Document 1). ).

JP 2020-121758 A

In the delaminating container described in Patent Document 1, the inner layer includes a barrier layer of ethylene-vinyl alcohol copolymer resin (EVOH) in order to improve the storage stability of the contents, and the outer layer includes a peelability from the barrier layer and a shell. It is formed using a monopolymer such as polyethylene (PE) or polypropylene (PP) from the viewpoint of squeezability of the part. However, when a PE or PP monopolymer is used for the outer layer, it is difficult to ensure sufficient transparency of the container.

In order to ensure the transparency of the container, there is a method of using random polypropylene (PP), polyethylene terephthalate (PET) or polycarbonate (PC) for the outer layer, but it is not flexible and the contents are discharged by pressing the body. Therefore, there is still room for improvement in these respects.

An object of the present disclosure is to solve such problems, and an object thereof is to maintain the conventional squeezing properties and gas barrier properties of the trunk while improving transparency. It is to propose a peeling container.

The delaminating container of the present disclosure comprises:
A delaminating container comprising an outer layer body and a volume-reducing and deformable inner layer detachably laminated on the inner surface of the outer layer body,
A bottle shape having a cylindrical mouth, a body formed below the mouth and elastically deformable by pressing, and a bottom closing the lower end of the body,
The outer layer body is formed with an outside air introduction hole for introducing outside air into a space between the outer layer body and the inner layer body,
The outer layer body has a first ionomer resin layer forming the outermost layer of the substrate,
The inner layer body is characterized by having a second ionomer resin layer forming the innermost layer of the substrate.

Further, in the delamination container of the present disclosure, in the above configuration, the outer layer body has a polyethylene-based resin layer or a polypropylene-based resin layer inside the first ionomer resin layer, and the inner layer body includes the second ionomer resin layer. It is preferable to have a gas-barrier resin layer outside the ionomer resin layer.

Further, in the delamination container of the present disclosure, in the above configuration, the first ionomer resin layer is formed of an ethylene-based ionomer resin, and the polyethylene-based resin layer or the polypropylene-based resin layer is made of the first ionomer It is preferably arranged adjacent to the inner side of the resin layer.

In the delamination container of the present disclosure, it is preferable that the outer layer contains 80% by weight or more of the ionomer resin, and the inner layer contains 50% by weight or more of the ionomer resin.

According to the present disclosure, it is possible to propose a delamination container capable of improving transparency while maintaining conventional squeezing properties and gas barrier properties of the body.

1 is a front partial cross-sectional view of a delamination container according to an embodiment of the present disclosure; FIG. FIG. 1B is a detailed view of part A in FIG. 1A; [0014] Fig. 4 is a bottom view of a delaminating container according to an embodiment of the present disclosure; FIG. 4 is a diagram showing a layer configuration of a body portion of a delaminating container according to an embodiment of the present disclosure;

Hereinafter, the present disclosure will be described more specifically with reference to the drawings.

FIG. 1A is a front partial cross-sectional view showing the configuration of a delamination container 100 that is an embodiment of the present disclosure. The delamination container 100 has a bottle shape, and is elastically deformable by pressing. It is provided with a cylindrical mouth portion 10 forming an opening 10a for supplying and discharging continuous contents inside, and a bottom portion 40 closing the lower end portion of the body portion 20 . As shown in FIG. 1A, the outer peripheral surface of the mouth portion 10 is provided with an externally threaded portion 10b to which a cap, a pump, or the like can be attached by threading. In place of the male screw portion 10b, a convex or concave engaged portion is provided, and the concave or convex engaging portion provided on the cap is engaged with the engaged portion, thereby opening the cap. You may make it hold|maintained at the part 10. FIG.

As shown in a partial cross-section in FIG. 1B, the delamination container 100 includes an inner layer body 22 that forms a storage space S that stores contents, and an outer layer body 21 that covers the inner layer body 22 from the outside in the radial direction. At two circumferentially opposed locations (both left and right ends in FIG. 1A) of the trunk portion 20, adhesive strips 25 are provided that adhere the inner layer body 22 and the outer layer body 21 and extend in the vertical direction. The inner layer 22 is detachably laminated on the inner surface of the outer layer 21 except for the region where the adhesive band 25 is provided and the pinch-off portion 45 of the bottom portion 40 which will be described later. It is configured so that it can be reduced in volume and deformed.

Here, the expression that the inner layer body 22 is “separably laminated” on the inner surface of the outer layer body 21 means that the inner layer body 22 laminated on the inner surface of the outer layer body 21 in a state of being adhered, pseudo-adhered, or welded is In addition to being able to be peeled off from the outer layer body 21 , the inner layer body 22 simply laminated on the inner surface of the outer layer body 21 in close contact with the outer layer body 21 is separated from the outer layer body 21 .

In this specification, claims and drawings, the side on which the mouth portion 10 is located is referred to as the upper side (upper side in FIG. 1A), and the side on which the bottom portion 40 is located is referred to as the lower side (lower side in FIG. 1A). The radially outer side is the direction away from the central axis O along a straight line that passes through the central axis O of the delamination container 100 in FIG. 1A and is perpendicular to the central axis O. The radially inner side is the direction along the straight line. shall mean the direction towards the axis O; In the description of the layer structure of the delamination container 100, the side of the outer layer body 21 on which the first ionomer resin layer 21a is located is the outside, and the side of the inner layer body 22 on which the second ionomer resin layer 22a is located is the inside ( accommodation space S side) (see FIG. 3).

The delamination container 100 is made of synthetic resin. For example, the synthetic resin forming the outer layer body 21 and the synthetic resin forming the inner layer body 22 are co-extruded in a molten state to form a cylindrical laminated parison. It can be formed by sandwiching the laminated parison between molds and subjecting it to blow molding (extrusion blow molding).

The outer layer body 21 of the mouth portion 10 is formed with outside air introduction holes 10c at two locations facing each other with the central axis O interposed therebetween. The outside air introduction hole 10c penetrates the outer layer body 21 horizontally toward the central axis O and has a circular shape. The outside air introduction hole 10c does not penetrate the inner layer body 22, and air can flow into the space between the outer layer body 21 and the inner layer body 22 through the outside air introduction hole 10c. In order to efficiently introduce the outside air from the outside air introduction hole 10 c formed in the mouth portion 10 , an outside air introduction rib may be formed in the shoulder portion 30 . Further, in the present embodiment, the outside air introduction hole 10c is provided in the mouth portion 10, but it is sufficient if air can be introduced between the outer layer body 21 and the inner layer body 22. The position, number and shape are not particularly limited.

The shoulder portion 30 continues to the lower end portion of the mouth portion 10 and expands outward in the radial direction downward. As shown in FIG. 1A, the shoulder portion 30 of the present embodiment is entirely inclined at a substantially constant angle with respect to the central axis O, and has a flat shape with a straight outline. Instead, it may have a dome shape that bulges toward the outside of the container, or it may have an inverted dome shape that dents toward the inside of the container.

The upper end of the body portion 20 continues to the lower end of the shoulder portion 30 , and the lower end of the body portion 20 continues to the outer peripheral edge of the bottom portion 40 . The trunk portion 20 has a squeezable flexibility, and the content can be poured out by squeezing the substantially central height of the trunk portion 20 (indicated by the white arrow in FIG. 1A). there is The method of pouring out the contents is not particularly limited. For example, the contents may be poured out by the weight of the contents by placing the delaminating container 100 in an inverted position. 10 may be attached. Further, the trunk portion 20 is curved and constricted as a whole so that the central position in the height direction (the direction of the central axis O) is concave toward the central axis O side. That is, the body portion 20 gradually decreases in diameter downward from the upper end connected to the shoulder portion 30 , and gradually expands in diameter from the smallest diameter portion to the lower end connected to the bottom portion 40 .

The bottom part 40 has a concavely curved shape, and the delamination container 100 can stand on its own by grounding the ground surface 41 provided near the outer periphery of the bottom part 40. It's becoming A pinch-off portion 45 is formed in the bottom portion 40 of the present embodiment by parting with a split mold for blow molding.

As shown in FIG. 2 , the pinch-off portion 45 extends linearly along the parting line PL in the bottom portion 40 . A pinch-off portion 45 located in the bottom portion 40 extends radially through the center of the bottom portion 40 , and is configured so that the inner layer body 22 is not separated from the outer layer body 21 at the pinch-off portion 45 . Outside air may be introduced from the gap between the outer layers 21 in the pinch-off portion 45 instead of or together with the outside air introduction hole 10c provided in the mouth portion 10 .

FIG. 3 shows the layer structure of the body portion 20 of the laminated separation container 100 according to this embodiment. In this embodiment, the outer layer body 21 includes, in order from the outside, a first ionomer resin layer 21a and a low density polyethylene (LDPE) resin layer 21b.

The first ionomer resin layer 21a is a resin layer containing a polyethylene ionomer. The first ionomer resin layer 21a is a resin obtained by cross-linking a polymer containing methacrylic acid and polyethylene with a metal. The ionomer resin has high transparency due to its excellent surface smoothness, as will be described later. In addition, since the ionomer resin is excellent in elasticity and flexibility, when it is used for the outer layer body 21, it can be easily elastically deformed inward by squeezing the torso 20 of the user. In this embodiment, the ratio of the ionomer resin in the outer layer body 21 is set to 80% by weight or more.

As the ionomer resin contained in the first ionomer resin layer 21a, for example, Himilan (registered trademark) 1706 manufactured by Mitsui-Dow Polychemicals Co., Ltd. can be used, but is not limited thereto. Other ionomer resins that provide flexibility and flexibility may also be included.

The LDPE resin layer 21b is a resin layer containing LDPE resin as a main material. LDPE resin has a specific gravity of about 0.92 and flexibility. As the LDPE resin, for example, NUC8505 manufactured by ENEOSNUC Co., Ltd. can be used, but it is not limited to this, and other flexible LDPE resins may be included.

The outer layer body 21 may be provided with a PP resin layer instead of the LDPE resin layer 21b. Moreover, it is not limited to these embodiments, and for example, when the delaminating container 100 is formed by performing biaxial stretch blow molding, polyethylene terephthalate (PET) or the like may be used as the material of the outer layer body 21 .

Conventionally, materials containing LDPE resin or PP (monopolymer) resin, which are not compatible with the gas barrier resin used for the inner layer, have been used as the material of the outer layer. However, when an outer layer body containing LDPE resin or PP resin is used, sufficient transparency may not be obtained due to the smoothness quality of the outer surface. In this embodiment, as shown in FIG. 3, the first ionomer resin layer 21a is provided outside the LDPE resin layer 21b. Therefore, the transparency of the trunk portion 20 can be improved.

That is, since the first ionomer resin layer 21a having excellent smoothness is adopted as the resin forming the outer surface of the outer layer body 21, light rays passing through the outer surface of the outer layer body 21, which is the boundary with the air, are scattered by the outer surface. Therefore, it is possible to obtain the trunk portion 20 which is free from fogging and excellent in transparency. Further, in the present embodiment, the LDPE resin layer 21b is arranged inside the first ionomer resin layer 21a in the outer layer body 21, and the LDPE resin layer 21b and the gas barrier resin are not compatible with each other. It is also possible to secure the peelability of the gas barrier resin layer contained in the.

Furthermore, in this embodiment, the first ionomer resin layer 21a is configured to contain a polyethylene-based ionomer resin. With this configuration, the compatibility between the first ionomer resin layer 21a and the LDPE resin layer 21b can be enhanced, and peeling within the outer layer body 21 can be suppressed.

In this embodiment, the outer layer body 21 contains 80% by weight or more of the ionomer resin. With this configuration, it is possible to ensure the smoothness of the outer surface of the outer layer body 21 and maintain the transparency of the resin layer.

The thicknesses of the first ionomer resin layer 21a and the low-density polyethylene (LDPE) resin layer 21b can be, for example, 400 μm and 50 μm, respectively.

The outer surface of the first ionomer resin layer 21a may be decorated, for example, by painting. This is because the transparency of the outer layer body 21 is maintained even when the outer surface of the first ionomer resin layer 21a is decorated within a range in which smoothness is maintained. In this case, decoration such as painting is not included in the base material of the outer layer body 21 , and the first ionomer resin layer 21 a constitutes the outermost layer of the base material of the outer layer body 21 .

The outer layer body 21 may be a resin layer consisting only of the first ionomer resin layer 21a, or may include a resin layer other than the LDPE resin layer 21b inside.

As shown in FIG. 3, the inner layer body 22 includes, in order from the inside, a second ionomer resin layer 22a, an adhesive layer 22c and a nylon resin layer 22b.

The second ionomer resin layer 22a is a resin layer containing a polyethylene ionomer. The second ionomer resin layer 22a, like the first ionomer resin layer 21a, is a resin obtained by cross-linking a polymer containing methacrylic acid and polyethylene with a metal. Since the ionomer resin is excellent in elasticity and flexibility, the rigidity of the inner layer body 22 can be lowered, and the inner layer body 22 can be easily reduced in volume and deformed as the contents are used. In this embodiment, the inner layer body 22 is configured such that the ionomer resin ratio is 50% by weight or more.

As for the ionomer resin contained in the second ionomer resin layer 22a, Himilan (registered trademark) 1706 manufactured by Mitsui Dow Polychemicals Co., Ltd. can be used, but it is not limited thereto. Other flexible ionomer resins may be included.

The nylon resin layer 22b is a resin layer whose main material is nylon, and is provided outside the second ionomer resin layer 22a via an adhesive layer 22c. Nylon has gas barrier properties, and by providing the inner layer 22 with the nylon resin layer 22b, the contents in the inner layer 22 can be prevented from being exposed to the air. For the nylon constituting the nylon resin layer 22b, for example, a resin layer whose main material is NOVAMID2430AH2 (manufactured by Mitsubishi Chemical Corporation, NOVAMID is a registered trademark) can be used. Further, instead of the nylon resin layer 22b, a resin layer mainly composed of another resin having gas barrier properties such as ethylene-vinyl alcohol copolymer resin (EVOH) may be used as the gas barrier layer.

The thicknesses of the second ionomer resin layer 22a and the nylon resin layer 22b can be, for example, 100 μm and 20 μm, respectively.

For the adhesive layer 22c, for example, a resin layer whose main material is a modified polyolefin resin (“ADMER” (registered trademark) (model number: NB550) manufactured by Mitsui Chemicals, Inc.) can be used. At least one of the second ionomer resin layer 22a and the nylon resin layer 22b may be mixed with an adhesive to impart adhesiveness.

In addition, in the present embodiment, adhesive strips 25 extending in a belt shape in the vertical direction are provided at two locations in the circumferential direction that constitute the parting line PL (see FIG. 2). As for the adhesive band 25, the above modified polyolefin resin may be used, or another adhesive resin may be used. Also, the adhesive band 25 may be provided at only one location in the circumferential direction, or may be provided at three or more locations. Alternatively, a configuration in which the adhesive band 25 is not provided may be employed.

Conventionally, there have been cases where inner layer bodies containing only gas barrier resins such as nylon and EVOH have been used. However, when only a gas-barrier resin is used as the inner layer, sufficient transparency may not be obtained due to the smoothness of the inner surface. In this embodiment, as shown in FIG. 3, the second ionomer resin layer 22a is provided inside the nylon resin layer 22b. Therefore, the transparency of the trunk portion 20 can be improved.

That is, since the second ionomer resin layer 22a having excellent smoothness is adopted as the resin forming the inner surface of the inner layer body 22, light rays passing through the inner surface of the inner layer body 22, which is the boundary with the accommodation space S, are scattered by the inner surface. Since the light can be transmitted through without being obscured, it is possible to form the trunk portion 20 that is free from fogging and has excellent transparency.

The inner layer body 22 may be a resin layer consisting only of the second ionomer resin layer 22a, or may be provided with a resin layer other than the nylon resin layer 22b on the outside.

As described above, the delamination container 100 according to the present embodiment includes the outer layer body 21 and the volume-reducing and deformable inner layer body 22 peelably laminated on the inner surface of the outer layer body 21. A bottle shape having a cylindrical mouth 10, a body 20 formed below the mouth 10 and elastically deformable by pressing, and a bottom 40 closing the lower end of the body 20, The outer layer body 21 is formed with an outside air introduction hole 10c for introducing the outside air into the space between the outer layer body 21 and the inner layer body 22. and the inner layer body 22 has a second ionomer resin layer 22a forming the innermost layer of the substrate. By adopting such a configuration, the outer surface of the outer layer body 21 and the inner surface of the inner layer body 22 are made of the ionomer resin having excellent smoothness, so that the transparency of the body portion 20 can be improved. Therefore, the transparency of the body portion 20 can be improved while maintaining the conventional squeezing properties and gas barrier properties of the body portion 20 .

Further, in this embodiment, the outer layer body 21 has a polyethylene-based resin layer or a polypropylene-based resin layer inside the first ionomer resin layer 21a, and the inner layer body 22 has a layer outside the second ionomer resin layer 22a. It was configured to have a gas barrier resin layer. By adopting such a configuration, the inner layer body 22 is provided with the gas barrier resin layer, which suppresses the deterioration of the contents due to the gas entering the storage space S through the inner layer body 22, thereby preserving the contents. It can enhance the fragrance. Further, since the polyethylene-based resin layer or polypropylene-based resin layer having no compatibility with the gas-barrier resin layer is provided inside the first ionomer resin layer 21a in the outer layer body 21, the first ionomer resin layer 21a and the The fusion with the gas barrier resin layer can be suppressed, and the inner layer body 22 can be easily peeled inward from the outer layer body 21 .

Further, in the present embodiment, the first ionomer resin layer 21a is made of an ethylene-based ionomer resin, and the polyethylene-based resin layer or the polypropylene-based resin layer is adjacent to the inner side of the first ionomer resin layer 21a. configured to be placed. By adopting such a configuration, a polyethylene-based resin layer or a polypropylene-based resin layer compatible with the first ionomer resin layer 21a is arranged inside the first ionomer resin layer 21a. The adhesion between the resin layers constituting the can be strengthened.

In this embodiment, the outer layer body 21 contains 80% by weight or more of the ionomer resin, and the inner layer body 22 contains 50% by weight or more of the ionomer resin. By adopting such a configuration, the ratio of the ionomer resin in the outer layer body 21 in contact with the air is increased, the scattering of transmitted light on the outer surface of the outer layer body 21 is suppressed, and the transparency of the delamination container 100 can be enhanced. Further, the ratio of the ionomer resin in the second ionomer resin layer 22a facing the accommodation space S is increased to some extent to suppress the scattering of transmitted light on the inner surface of the inner layer body 22, thereby further enhancing the transparency of the delamination container 100. can be done.

Although the present disclosure has been described with reference to figures and examples, it should be noted that various variations and modifications will be readily apparent to those skilled in the art based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention. For example, the functions included in each component can be rearranged so as not to be logically inconsistent, and multiple components can be combined into one or divided. It should be understood that the scope of the present invention includes these.

For example, in the present embodiment, the opening 10 to the bottom 40 of the delamination container 100 is configured to have a laminated structure of the outer layer 21 and the inner layer 22, but the present invention is not limited to this aspect. It is sufficient that at least the trunk portion 20 defining the accommodation space S for accommodating the contents has a laminated structure of the outer layer body 21 and the inner layer body 22 .

(transparency)
Three types of samples were prepared with different configurations of the outer layer 21 and the inner layer 22 constituting the body 20 of the delamination container 100 shown in FIG. The total light transmittance and the HAZE (haze) value of light passing through the height position) were measured. The three types of samples are an example in which an ionomer resin layer (Himilan) is provided on each of the outer layer body 21 and the inner layer body 22, a comparative example 1 in which only the outer layer body 21 is provided with an ionomer resin layer, and an outer layer body 21 and an inner layer. Comparative Example 2 in which none of the bodies 22 are provided with an ionomer resin layer. In the samples of the examples, the proportion of the ionomer resin in the outer layer body 21 is 80% by weight or more, and the proportion of the ionomer resin in the inner layer body 22 is 50% by weight or more.

Table 1 shows the layer structures of Examples and Comparative Examples.

The total light transmittance is the ratio [%] of the amount of light after passing through the drum section 20 (total amount of transmitted light) to the amount of light before passing through the drum section 20 of the delamination container 100 . That is, it shows the light amount ratio before and after passing through the resin layer of the trunk portion 20 once.

On the other hand, the HAZE value is also called a cloudiness value, and is the ratio [%] of the diffuse transmitted light amount to the above-mentioned total light transmitted light amount. Haze-METER (model number: NDH-5000) manufactured by Nippon Denshoku Industries Co., Ltd. was used for the measurement. Table 2 shows the measurement results.

According to Table 2, when both the outer layer body 21 and the inner layer body 22 are attached, the total light transmittance is 75.64% (Comparative Example 2) by adopting the ionomer resin layer only for the outer layer body 21 (Comparative Example 1). ) to 84.05% (Comparative Example 1), and the HAZE value is greatly improved from 45.89% (Comparative Example 2) to 26.26% (Comparative Example 1). Mainly in the outer layer body 21, the total light transmittance increased from 78.83% (Comparative Example 2) to 88.92% (Comparative Example 1), and the HAZE value was 38.22% (Comparative Example 2). 6.08% (Comparative Example 1). The HAZE value of the inner layer body 22 was also improved from 27.28% (Comparative Example 2) to 16.31% (Comparative Example 1) by changing the gas barrier layer of the inner layer body 22 from EVOH to nylon. .

Further, when both the outer layer body 21 and the inner layer body 22 are attached, the total light transmittance is 75.64% (comparative example) by adopting the ionomer resin layer for both the outer layer body 21 and the inner layer body 22 (Example). 2) to 89.50% (Example), and the HAZE value is greatly improved from 45.89% (Comparative Example 2) to 10.66% (Example). In addition to the outer layer body 21, the inner layer body 22 also had a total light transmittance increased from 88.56% (Comparative Example 2) to 91.06% (Example), and the HAZE value was 27.28%. This is considered to be due to the significant improvement from (Comparative Example 2) to 3.10% (Example).

From the above results, it was found that the HAZE value was greatly improved by providing the ionomer resin layers on both the outer layer body 21 and the inner layer body 22 . According to the configuration of the example, the transparency of the body portion 20 of the delamination container 100 can be improved while maintaining the conventional gas barrier properties of the delamination container 100 .

(body rigidity)
Next, four types of samples with different layer configurations of the trunk portion 20 were prepared, and the rigidity of the trunk portion 20 was evaluated. The four types of samples are an example in which an ionomer resin layer (Himilan) is provided on each of the outer layer body 21 and the inner layer body 22, a comparative example 1 in which only the outer layer body 21 is provided with an ionomer resin layer, and an outer layer body 21 and an inner layer. Comparative Examples 3 and 4 in which neither body 22 is provided with an ionomer resin layer.

Table 3 shows the layer structures of Examples and Comparative Examples.

A flexural strength tester manufactured by Shimadzu Corporation (model number: AG-2000D) was used to evaluate the trunk stiffness. Using two φ20 mm spheres, the center height of the body 20 of the delamination container 100 (the height position indicated by the white arrow in FIG. 1A) is sandwiched from both sides, and the pressure is applied at 13 mm/min. The trunk rigidity was evaluated by measuring the load [N] when the trunk 20 was deformed at a speed of 100 m and the trunk 20 was displaced by a predetermined distance. Table 4 shows the evaluation results.

According to Table 4, when the ionomer resin layer was adopted for both the outer layer body 21 and the inner layer body 22 (Example), and when the ionomer resin layer was adopted only for the outer layer body 21 (Comparative Example 1), the trunk rigidity , the load required to displace the trunk 20 by the same distance is smaller than when the ionomer resin layer is not adopted for neither the outer layer 21 nor the inner layer 22 (Comparative Examples 3 and 4). There is a tendency. In other words, compared with Comparative Examples 3 and 4, Example and Comparative Example 1 resulted in a slightly lower trunk rigidity. Therefore, according to the configuration of the embodiment, the transparency of the body portion 20 of the delamination container 100 can be improved while maintaining the conventional squeezing property and gas barrier property of the delamination container 100 .

According to the present disclosure, it is possible to propose the delamination container 100 capable of improving the transparency while maintaining the conventional squeezing property and gas barrier property of the body portion 20 .

10 Mouth 10a Opening 10b Male screw 10c Outside air introduction hole 20 Body 21 Outer layer body 21a First ionomer resin layer 21b Low density polyethylene (LDPE) resin layer 21c LDPE resin layer 22 Inner layer body 22a Second ionomer resin layer 22b Nylon Resin layer 22c Adhesive layer 25 Adhesive band 30 Shoulder 40 Bottom 41 Ground surface 45 Pinch-off part 100 Delamination container O Central axis PL Parting line S Storage space

Claims (4)

A delaminating container comprising an outer layer body and a volume-reducing and deformable inner layer detachably laminated on the inner surface of the outer layer body,
A bottle shape having a cylindrical mouth, a body formed below the mouth and elastically deformable by pressing, and a bottom closing the lower end of the body,
The outer layer body is formed with an outside air introduction hole for introducing outside air into a space between the outer layer body and the inner layer body,
The outer layer body has a first ionomer resin layer forming the outermost layer of the substrate,
A delaminating container, wherein the inner layer body has a second ionomer resin layer forming the innermost layer of the substrate. The outer layer body has a polyethylene-based resin layer or a polypropylene-based resin layer inside the first ionomer resin layer,
2. The delamination container according to claim 1, wherein said inner layer body has a gas barrier resin layer outside said second ionomer resin layer. The first ionomer resin layer is made of an ethylene-based ionomer resin,
3. The delamination container according to claim 2, wherein the polyethylene-based resin layer or the polypropylene-based resin layer is arranged adjacent to the inner side of the first ionomer resin layer. The delamination container according to any one of claims 1 to 3, wherein the outer layer body contains 80% by weight or more of the ionomer resin, and the inner layer body contains 50% by weight or more of the ionomer resin.

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