TW201934427A - Delamination container - Google Patents

Abstract

Provided is a delamination container in which damage from being dropped at a low temperature is suppressed. The present invention provides a delamination container comprising a container body having an outer shell and an inner bag, which contracts as the contents thereof decrease, wherein the outer shell has a mixed layer which includes a polypropylene and a polyethylene elastomer.

Description

Laminated peel container

The present invention relates to a laminated peel container.

There is currently known a laminated peeling container that suppresses air from entering the inside of the container by shrinking the inner bag as the content decreases (for example, Patent Document 1).

[Existing technical literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2015-163531

The inventors performed repeated low temperature drop tests on the container of Patent Document 1, and the container was damaged.

The present invention has been made in view of the above circumstances, and provides a method capable of suppressing breakage when dropped at a low temperature. Laminate peeling container.

According to the present invention, there is provided a laminated peeling container including a container body having an outer shell and an inner bag, and the inner bag shrinks as the content decreases. The outer shell has a mixed layer containing polypropylene. And polyethylene elastomer.

The present inventors have conducted intensive studies and found that by providing a mixed layer containing a polypropylene and a polyethylene-based elastomer in the casing, damage at the time of falling at a low temperature can be suppressed, and the present invention has been completed.

The following illustrates various embodiments of the present invention. The embodiments shown below can be combined with each other.

Preferably, the outer shell includes an innermost layer facing the inner bag, and the mass ratio of the polyethylene-based elastomer in the resin component contained in the innermost layer is higher than the mass of the polyethylene-based elastomer in the resin component contained in the mixed layer. Small proportion.

The proportion of the polyethylene-based elastomer in the resin component contained in the mixed layer is preferably 1 to 20% by mass.

Preferably, the mixed layer further contains a linear low density polyethylene.

1‧‧‧ laminated peel container

3‧‧‧ container body

5‧‧‧ Valve parts

5a‧‧‧Shaft

5b‧‧‧Detent

5c‧‧‧ cover

5d‧‧‧flow channel

7‧‧‧ Containment Department

7a‧‧‧ recess

9‧‧‧ mouth

9d‧‧‧ Engagement Department

12‧‧‧ shell

14‧‧‧ inner bag

15‧‧‧ Outside air introduction hole

21‧‧‧ middle space

27‧‧‧ Clamping section

29‧‧‧ underside

29a‧‧‧ concave area

29b‧‧‧surrounding area

29c‧‧‧slot

29d‧‧‧side

29e‧‧‧circle

29f‧‧‧ Grounding Area

29g‧‧‧Rim

S‧‧‧External space

FIG. 1 is a perspective view showing a configuration of a container body 3 of a laminated peeling container 1 according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view through the center of the outside air introduction hole 15 in FIG. 1. In FIG. 2, a valve member 5 is attached to the outside air introduction hole 15.

FIG. 3 shows the structure near the bottom surface 29 of the container body 3 in FIG. 1, FIG. 3A is a bottom view, FIG. 3B is a front view, FIG. 3C is a cross-sectional view taken along A-A in FIG. In FIG. 3A, when the container body 3 is placed on a horizontal plane, the grounded ground area 29f is marked with a hatched line. In FIG. 3D, the layer structure is omitted and shown by hatching.

FIG. 4 is a perspective view showing a configuration of a container body 3 of a laminated peeling container 1 according to a second embodiment of the present invention.

FIG. 5 shows the structure near the bottom surface 29 of the container body 3 of FIG. 4, FIG. 5A is a bottom view, FIG. 5B is a front view, FIG. 5C is a cross-sectional view taken along A-A in FIG. 5A, and FIG. In FIG. 5A, when the container main body 3 is placed on a horizontal plane, a grounded ground area 29 f is marked with a hatched line. In FIG. 5D, the layer structure is omitted and shown by hatching.

FIG. 6 is a perspective view showing a configuration of a container body 3 of a laminated peeling container 1 according to a third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described. Various feature items shown in the embodiments described below can be combined with each other. In addition, each feature can independently constitute the invention.

1. First embodiment

As shown in FIGS. 1 to 3, the laminated peeling container 1 according to the first embodiment of the present invention includes a container main body. 体 3 和 Valve member 5. The container main body 3 includes a storage portion 7 that stores the content, and a mouth portion 9 that discharges the content from the storage portion 7.

As shown in FIG. 2, the container body 3 includes a storage portion 7 that stores the content, and a mouth portion 9 that discharges the content from the storage portion 7. The container main body 3 includes an outer case 12 and an inner bag 14 in the receiving portion 7 and the mouth portion 9. As the content decreases, the inner bag 14 shrinks away from the outer case 12.

The mouth portion 9 is provided with a cap with a check valve and an engageable engagement portion 9d. The cap can be capped by gland or screwed.

As shown in FIG. 1, the receiving portion 7 is provided with a recessed portion 7 a, and the recessed portion 7 a is provided with an external air introduction hole 15. The outside air introduction hole 15 is a through hole provided only in the outer case 12, and communicates the intermediate space 21 between the outer case 12 and the inner bag 14 and the outer space S of the container body 3.

As shown in FIG. 2, the valve member 5 includes a shaft portion 5 a that is inserted into the outside air introduction hole 15 and is slidable relative to the outside air introduction hole 15; and is provided on the intermediate space 21 side of the shaft portion 5 a and has a cross-sectional area larger than that of the shaft portion A cover portion 5c having a large size 5a; a locking portion 5b provided on the outer space S side of the shaft portion 5a and preventing the valve member 5 from entering the intermediate space 21.

The cover portion 5c is configured to substantially close the outside air introduction hole 15 when the case 12 is compressed, and has a shape in which the cross-sectional area becomes smaller as it approaches the shaft portion 5a. In addition, the locking portion 5b is configured such that air can be introduced into the intermediate space 21 when the casing 12 is restored after being compressed. When the casing 12 is compressed, the intermediate space 21 The internal pressure is higher than the external pressure, and the air in the intermediate space 21 leaks from the external air introduction hole 15 to the outside. This pressure difference and the flow of air cause the cover portion 5c to move to the outside air introduction hole 15, and the cover portion 5c closes the outside air introduction hole 15. The cover portion 5c has a shape in which the cross-sectional area becomes smaller as it approaches the shaft portion 5a. Therefore, the cover portion 5c is easily fitted into the outside air introduction hole 15 to close the outside air introduction hole 15.

When the outer case 12 is further compressed in this state, the pressure in the intermediate space 21 increases, and as a result, the inner bag 14 is compressed, and the contents in the inner bag 14 are discharged. In addition, when the pressing force on the casing 12 is contacted, the casing 12 is restored by its own elasticity. At this time, the cover portion 5 c is separated from the outside air introduction hole 15, so that the closing of the outside air introduction hole 15 is released, and outside air is introduced into the intermediate space 21. In addition, in order to prevent the blocking portion 5b from blocking the outside air introduction hole 15, a flow path 5d is provided in the blocking portion 5b, so that even when the blocking portion 5b abuts against the housing 12, the flow path 5d and the outside air are passed through. The introduction hole 15 can also introduce outside air into the intermediate space 21.

As shown in FIGS. 1 and 3, a concave region 29 a and a peripheral region 29 b are provided on the bottom surface 29 of the accommodation portion 7. The peripheral region 29b is provided so as to surround the concave region 29a. The concave region 29a is a region recessed with respect to the peripheral region 29b. The recessed area 29 a is provided with a clip portion 27. The nip portion 27 is a sealing portion of the laminated parison at the time of blow molding using the cylindrical laminated parison. The clip portion 27 has an elongated shape. A groove 29c is provided in the peripheral region 29b on the extension of the clip portion 27. The curvature radius of the side 29d of the groove 29c is preferably 4 mm or more. The curvature radius is, for example, 4 to 20 mm, preferably 5 to 9 mm, and specifically, for example, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18 , 19, 20mm, can be within the range between any two values exemplified here. By setting the radius of curvature to 4 mm or more, damage to the container at the side 29d of the groove 29c can be suppressed. It should be noted that a dotted line is used in FIG. 3B A circle 29e having the same radius as the radius of curvature of the side 29d is shown.

The peripheral region 29b is provided with a grounding region 29f that is grounded when the container body 3 is placed on a horizontal surface. In FIG. 3A, the ground area 29f is hatched. When the radius of the outer edge 29g of the ground region 29f is R1 and the outer radius of the container body 3 is R2, R1 / R2 is preferably 0.75 or more. The value is, for example, 0.75 to 0.90, preferably 0.77 to 0.85, and specifically, for example, 0.75, 0.76, 0.77, 0.78, 0.79, 0.8, 0.81, 0.82, 0.83, 0.84, 0.85, 0.86, 0.87, 0.88, 0.89, 0.9 , Can be in the range between any two values exemplified here. By setting the value to be 0.75 or more, it is possible to reduce the impact on the container main body 3 when the container main body 3 is dropped, thereby suppressing damage to the container.

In addition, as shown in FIG. 3D, the depth of the groove 29c becomes shallower toward the outside, and with this configuration, the container body 3 cannot be easily turned over.

The layer structure of the container main body 3 is explained in detail. The container body 3 includes an outer case 12 and an inner bag 14.

The casing 12 may have a single-layer structure or a multilayer structure. The case 12 has a mixed layer containing a polypropylene and a polyethylene-based elastomer. Polypropylene can be a homopolymer of propylene or a copolymer of propylene and other monomers. The copolymer may be a block copolymer or a random copolymer, but is preferably a random copolymer from the viewpoint of transparency.

The proportion of polypropylene in the resin component contained in the mixed layer is preferably 60 to 99% by mass. One step is preferably 70 to 95% by mass, and specifically, for example, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87 , 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99% by mass, and can be within a range between any two values exemplified here.

The proportion of the polyethylene-based elastomer in the resin component contained in the mixed layer is preferably 1 to 20% by mass, and more preferably 3 to 15% by mass. Specifically, the ratio is, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, and 20% by mass. It can be within a range between any two values exemplified here. If the proportion of the polyethylene-based elastomer is too small, the effect of suppressing damage to the container at a low temperature drop may not be sufficient. If the proportion of the polyethylene-based elastomer is too large, the container may be stuck and the strength of the container may be reduced.

The content of monomers other than propylene in the random copolymer is less than 50 mol%, and preferably 5 to 35 mol%. Specifically, the content is, for example, 5, 10, 15, 20, 25, or 30 mol%, and may be within a range between any two values exemplified here. As a monomer copolymerized with propylene, any monomer which can improve the impact resistance of a random copolymer compared with a propylene homopolymer may be sufficient, and ethylene is especially preferable. In the random copolymer of propylene and ethylene, the ethylene content is preferably 5 to 30 mol%, and specifically, for example, 5, 10, 15, 20, 25, and 30 mol%, and it may be between any two values exemplified here. Within range.

The polyethylene-based elastomer is an elastomer having polyethylene as a hard segment and a predetermined rubber component as a soft segment. Examples include C-4 polyethylene elastomers with butene added to comonomer with respect to ethylene, C-6 polyethylene elastomers with hexene added, and C-8 polyethylene with octene added. Ethylene-based elastomers and the like.

The mixed layer may contain only polypropylene and polyethylene-based elastomers as the resin component, or may contain other resin components. Examples of other resin components include polyethylene. The polyethylene may be any of a low-density polyethylene, a linear low-density polyethylene, and a high-density polyethylene, and a linear low-density polyethylene is preferred.

The proportion of other resin components in the resin components contained in the mixed layer is preferably 1 to 20% by mass, and more preferably 3 to 15% by mass. Specifically, the ratio is, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 16, 18, 19, and 20% by mass. It can be within a range between any two values exemplified here.

When the casing 12 has a multilayer structure, it may include an innermost layer facing the inner bag 14 in addition to the above-mentioned mixed layer. If the innermost layer contains a large amount of polyethylene-based elastomer, the peelability between the outer shell 12 and the inner bag 14 may be deteriorated. Therefore, the mass ratio of the polyethylene-based elastomer in the resin component contained in the innermost layer is set. When P1 is P1 and the mass ratio of the polyethylene-based elastomer in the resin component contained in the mixed layer is P2, P1 / P2 is preferably less than 1, and more preferably 0.5 or less. Specifically, the value is, for example, 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, and may be within a range between any two values exemplified here.

The innermost layer may contain only polypropylene as a resin component, or may contain other resin components. The other resin components are the same as those of the mixed layer. In addition, the innermost layer may contain fatty acid amidine (example: oleic acid Hydrazine).

When the casing 12 has a multilayer structure, the mixed layer may be the outermost layer, or an outermost layer having a resin component may be separately provided. For example, as the outermost layer, a layer made of polyethylene (for example, low-density polyethylene) may be provided. In addition, the casing 12 may include a recycled layer made of scrap material generated when the recycling container is formed. The regeneration layer is preferably provided between the mixed layer and the innermost layer.

When the overall thickness of the casing 12 is T1 and the thickness of the mixed layer is T2, T2 / T1 is, for example, 0.1 to 1, and specifically, for example, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 It may be within a range between any two of the values exemplified here. When the thickness of the innermost layer is set to T3, T3 / T1 is, for example, 0.05 to 0.5, and specifically, 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, and 0.5 can also be exemplified here. Within a range between any two values. T2 / T3 is, for example, 0.5 to 10, and specifically, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 and 10 can also be in the range between any two values exemplified here.

The inner bag 14 includes an EVOH layer provided on the outer surface side of the container, an inner surface layer provided on the inner surface side of the container of the EVOH layer, and an adhesive layer provided between the EVOH layer and the inner surface layer. By providing the EVOH layer, gas barrier properties and peelability when peeled from the case 12 can be improved. The adhesive layer can also be omitted.

The EVOH layer is a layer composed of an ethylene-vinyl alcohol copolymer (EVOH) resin, and is obtained by hydrolysis of an ethylene and vinyl acetate copolymer. The ethylene content of EVOH resin is, for example, 25-50 mol % Is preferably 32 mol% or less from the viewpoint of oxygen barrier properties. The lower limit of the ethylene content is not particularly limited, but as the ethylene content decreases, the flexibility of the EVOH layer tends to decrease, so it is preferably 25 mol% or more.

The inner layer is a layer that is in contact with the contents, for example, made of low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, ethylene-propylene copolymer, cycloolefin polymer, EVOH, and mixtures thereof. Make up.

The adhesive layer is a layer having a function of adhering the EVOH layer and the inner surface layer. For example, an acid-modified polyolefin (for example, maleic anhydride-modified polyethylene) to which a carboxyl group is introduced into the polyolefin is added, or ethylene -Vinyl acetate copolymer (EVA). An example of the adhesive layer is a low-density polyethylene or a mixture of a linear low-density polyethylene and an acid-modified polyethylene.

2. Second Embodiment

A laminated peeling container 1 according to a second embodiment of the present invention will be described with reference to FIGS. 4 to 5. The container body 3 of the laminated peeling container 1 of the present embodiment has the same layer structure as that of the first embodiment, but the bottom surface 29 has a different shape.

The shape of the bottom surface of this embodiment is the same as that of Patent Document 1, and the radius of curvature of the side 29d of the groove 29c is 3 mm. When the radius of the outer edge 29g of the ground region 29f is R1 and the outer radius of the container body 3 is R2, R1 / R2 is 0.72.

The container of the present embodiment is provided with a mixing layer in the casing 12, and the container is not easily broken when dropped at a low temperature. However, since the radius of curvature of the side 29d is less than 4 mm and R1 / R2 is less than 0.75, it may be similar to the first embodiment. The container is more easily broken than when dropped at a low temperature.

3. Third Embodiment

A laminated peeling container 1 according to a third embodiment of the present invention will be described using FIG. 6. The container main body 3 of the laminated peeling container 1 according to the present embodiment has the same layer configuration and bottom surface shape as those of the first embodiment, but the shape of the storage portion 7 is different. A container having such a shape according to this embodiment can also provide the same functions and effects as those of the first embodiment.

[Example] [Test Example 1] Sample making

The container body 3 is produced by blow molding. The container body 3 has an outer shell [mixed layer (15.5%) / recycled layer (58.0%) / innermost layer (10.0%)] / inner bag [EVOH layer ( 5.5%) / adhesive layer (4.5%) / inner layer (6.5%)]. The numerical values in parentheses in the layer structure indicate the ratio of the thickness of each layer to the total wall thickness of the container. The container wall thickness was about 0.7 mm. The container body 3 has a shape similar to that shown in the first embodiment, and the diameter of the receiving portion 7 is 50 mm. An outer air introduction hole 15 is formed in the outer shell 12 of the container body 3, and the inner bag 14 is pre-peeled from the outer shell 12 to prepare a sample.

The resin constituting each layer is as follows.

<Mixed Layer of the Shell>

A mixed resin containing 83.7% by mass of the following random polypropylene, 9.3% by mass of the linear low-density polyethylene, and 7% by mass of the polyethylene-based elastomer is contained.

Random polypropylene (density: 0.890g / cm ³ ; MFR (230 ° C, 2.16kg): 1.20g / 10min; melting point: 135 ° C)

Polyethylene elastomer (comonomer is 1-butene; density 0.860g / cm ³ ; MFR (190 ° C, 2.16kg): 0.50g / 10min; melting point 50 ° C)

Linear low-density polyethylene (density: 0.898g / cm ³ ; MFR (190 ° C, 2.16kg): 2.00g / 10min; melting point: 94 ° C)

<Regeneration layer of the case>

Resin obtained from scraps generated during container molding

<The innermost layer of the case>

A mixed resin containing 90.7% by mass of the above-mentioned random polypropylene and 9.3% by mass of the linear low-density polyethylene (0.35% by mass of ammonium oleate).

<EVOH layer of inner bag>

EVOH (Model: SOANOL SF7503B; Japan Synthetic Chemical Industry Co., Ltd.)

<Adhesive layer of inner bag>

Acid modified polyolefin (model: MODIC L522; manufactured by Mitsubishi Chemical Corporation)

<The innermost layer of the inner bag>

Low density polyethylene (model: SUNTEC-LD; grade: F2206; manufactured by Asahi Kasei Corporation)

2.Low temperature drop test

The container body 3 was filled with a saline solution having a specific gravity of 1.16 g / ml, and the cap was tightly closed as a sample, and five such samples were prepared. For each sample, the vertical drop and the horizontal drop were alternately performed from the height of 1 m to the concrete floor under the environment of 5 ° C, and repeated 5 times. When it was confirmed that the container was broken on the way, the drop test of the sample was finished at that time. When dropping vertically, the sample is dropped with the container cap facing up and the bottom face facing downward. When dropping horizontally, the sample is dropped with the container level and the clamping portion facing up and down.

In Test Example 1, no breakage of the container was confirmed in all the samples in the five drop tests.

[Test Example 2] Sample making

Samples were prepared in the same manner as in Test Example 1. However, the layer structure is changed from the outer side of the container to the outer shell [outermost layer (15.0%) / recycled layer (57.0%) / innermost layer (10.0%)] / inner bag [EVOH layer (6.0%) / adhesive layer (5.0 %) / Inner layer (7.0%)].

As the resin constituting each layer, the following resins were used. The reproduction layer of the outer case and the inner bag were made of the same resin as in Test Example 1.

<The outermost layer of the case>

A mixed resin containing 85% by mass of the above-mentioned random polypropylene and 15% by mass of the linear low-density polyethylene.

<The innermost layer of the case>

The above-mentioned random polypropylene (0.35 mass% of ammonium oleate).

2.Low temperature drop test

A low temperature drop test was performed in the same manner as in Test Example 1. The five samples were confirmed to rupture at the first longitudinal drop, the third longitudinal drop, the third longitudinal drop, the third lateral drop, and the fourth longitudinal drop, respectively.

[Test Example 3] Sample making

Samples were prepared in the same manner as in Test Example 1. However, the layer structure is changed from the outer side of the container to the outer shell [outermost layer (15.5%) / recycled layer (59.0%) / innermost layer (10.5%)] / inner bag [EVOH layer (5.0%) / adhesive layer (4.5 %) / Inner layer (5.5%)].

The outermost layer of the casing is composed of the above-mentioned low density polyethylene. The recycled layer, the innermost layer, and the inner bag of the case were made of the same resin as in Test Example 2.

2.Low temperature drop test

A low temperature drop test was performed in the same manner as in Test Example 1. 2 samples in the 3rd time Cracking was confirmed at the time of the horizontal drop and the fourth horizontal drop. Three samples also failed to confirm rupture after five drop tests.

[Test Example 4] Sample making

A sample having the bottom surface shape shown in the second embodiment was produced using the same layer configuration and method as in Test Example 2.

2.Low temperature drop test

A low temperature drop test was performed in the same manner as in Test Example 1. The five samples were confirmed to rupture at the first longitudinal drop, the first longitudinal drop, the first longitudinal drop, the first lateral drop, and the first lateral drop.

[Inspection]

In Test Example 1, no crack was observed in all the samples, and it was confirmed that the structure of the present invention can suppress the damage at the time of falling at a low temperature. By comparing Test Example 2 and Test Example 4, it was confirmed that the container with the bottom surface shape shown in the first embodiment can suppress damage at the time of falling at a lower temperature than the container with the bottom surface shape shown in the second embodiment.

Claims (4)

A laminated peeling container includes a container body having an outer shell and an inner bag, and the inner bag shrinks as the content decreases, and the outer shell has a mixture of polypropylene and polyethylene-based elastomer Floor. The laminated peeling container according to claim 1, wherein the outer shell has an innermost layer facing the inner bag, and the mass of the polyethylene-based elastomer in the resin component contained in the innermost layer The ratio is lower than the mass ratio of the polyethylene-based elastomer in the resin component contained in the mixed layer. The laminated peeling container according to claim 1 or 2, wherein the proportion of the polyethylene-based elastomer in the resin component contained in the mixed layer is 1 to 20% by mass. The laminated peeling container according to claim 1 or 2, wherein the mixed layer further contains a linear low-density polyethylene.