JP7175631B2 - double container - Google Patents

Description

TECHNICAL FIELD The present invention relates to a double container in which a volume-reducing and deformable inner layer is housed inside an outer layer, and in particular, a double container formed by extrusion blow molding a laminated parison and provided with a ridge-shaped pinch-off portion at the bottom. Regarding.

A bottle-shaped outer layer having a mouth, a body and a bottom and an inner side of the outer layer as a container for storing cosmetics such as lotion, liquid contents such as shampoo, rinse, liquid soap, or food seasoning. and a volume-reducing and deformable inner layer stored in the inner layer, after squeezing the body of the outer layer to pour out the contents stored in the inner layer, the inner layer through the air introduction hole provided in the outer layer There is known a double container in which the outer layer can be restored to its original shape while the inner layer is reduced and deformed by introducing outside air between the body and the outer layer (for example, see Patent Reference 1). According to the double container having such a configuration, the contents can be poured out without replacing air, so that the contents housed in the inner layer body are less likely to come into contact with the air. It is possible to suppress the deterioration and deterioration of things.

JP 2013-151316 A

As a double container as described above, a delaminated container (delaminated container) formed by extrusion blow molding (EBM) of a laminated parison using a mold is known. In this case, the double container is formed by co-extrusion of a synthetic resin material for the outer layer and a synthetic resin material for the inner layer, which have low compatibility, to form a cylindrical laminated parison. By blow molding using a mold, a double structure in which the inner layer is laminated on the inner surface of the outer layer is formed. At this time, the cylindrical laminated parison is crushed by the mold and its tip is cut off to close the opening, so that a ridge-shaped pinch-off portion is provided at the bottom of the double container. Become.

On the other hand, in the double container, the check valve function provided in the spout cap attached to the mouth of the container allows the air between the outer layer and the inner layer to escape from the air introduction hole when the body is squeezed. Preventing leakage to the outside, the inner layer body is indirectly pressed against the barrel through the air, and the contents are poured out, and when the barrel is released from the squeeze, the air introduction hole The outer layer body is restored to its original shape while the inner layer body is reduced in volume and deformed by opening the outer layer body and the inner layer body so that outside air is introduced between the outer layer body and the inner layer body.

In this way, in the double container, when the body of the outer layer is squeezed to pour out the contents, the outer layer and the inner layer are separated from each other so that the air between the outer layer and the inner layer does not leak to the outside. must be kept between Therefore, when the container is dropped and the pinch-off portion provided at the bottom of the container is subjected to an impact or the like and the pinch-off portion is cracked, the body portion of the outer layer body is squeezed to pour out the contents. However, the air between the outer layer body and the inner layer body leaks to the outside from the pinch-off portion, and the internal pressure of the air does not increase, resulting in a problem that the contents cannot be poured out. In addition, there is a risk that the pinch-off portion may crack due to the pressure transmitted to the bottom portion when the body portion is squeezed.

The double container can also have a configuration in which a pouring tool having a pump is attached to the mouth and the contents are poured out by operating the pump. There is no need to squeeze deform the part. However, even in this case, if a crack occurs in the pinch-off portion, there is a possibility that water may enter through the cracked portion of the pinch-off portion as the inner layer is deformed to reduce the volume.

Conventionally, relatively soft polyethylene (such as low-density polyethylene) was used as a material for the outer layer body, so cracking of the pinch-off portion due to impact or the like was less likely to occur.

However, if polypropylene, which is harder than polyethylene, is used for the outer layer in order to reduce the weight of the container and ensure heat resistance, the pinch-off part will crack if the container is subjected to impact, etc., and the contents will be damaged. There was a problem that it might become difficult to pour out. In particular, when polypropylene is used for the outer layer, the inner layer tends to protrude from the outer layer at the pinch-off portion and is exposed to the outside, so that cracks are likely to occur between the outer layer and the inner layer.

An object of the present invention is to solve such problems, and an object of the present invention is to provide a double-layered container that is resistant to cracking at the pinch-off portion even when polypropylene is used for the outer layer. be.

The double container of the present invention comprises a bottle-shaped outer layer body having a mouth portion, a body portion and a bottom portion, a volume-reducing and deformable inner layer body housed inside the outer layer body, and a ridge provided on the bottom portion. and a pinch-off portion having a shape, wherein the outer layer body is composed mainly of polypropylene and polyethylene, and is laminated inside the body layer. an inner layer detachably laminated to the inner layer body, the inner layer being exposed to the outside at the lower end of the pinch-off portion, and the inner layer body being the inner layer at the lower end of the pinch-off portion; characterized by being covered with

In the double container of the present invention, in the above configuration, it is preferable that the inner layer is mainly made of low density polyethylene or linear low density polyethylene.

In the double container of the present invention, in the above configuration, it is preferable that the inner layer body is made of EVOH and has a barrier layer laminated inside the inner layer.

In the double container of the present invention, in the above structure, it is preferable that an outermost layer mainly made of polyethylene is laminated on the outer side of the main body layer.

In the double container of the present invention, in the above configuration, it is preferable that at least one adhesive band layer extending from the mouth portion to the bottom portion is provided between the outer layer body and the inner layer body.

In the double container of the present invention having the above configuration, it is preferable that an outside air introduction hole for introducing outside air between the outer layer body and the inner layer body is provided in the mouth portion or the body portion.

According to the present invention, it is possible to provide a double container in which the pinch-off portion is less likely to crack even when polypropylene is used for the outer layer.

It is a partially notched front view of the double container which concerns on one embodiment of this invention. Figure 2 is a side view of the double container shown in Figure 1; 2 is a bottom view of the double container shown in FIG. 1; FIG. FIG. 2 is an explanatory view showing the layer structure of the double container shown in FIG. 1; 4 is a cross-sectional view of the pinch-off portion shown in FIG. 3; FIG.

Hereinafter, the configuration of the double container 1 according to one embodiment of the present invention will be illustrated in detail with reference to the drawings.

In this specification and claims, the vertical direction means the vertical direction when the double container 1 is in an upright position as shown in FIG. Further, the radial direction means a direction along a straight line passing through the central axis of the double container 1 and perpendicular to the central axis.

As shown in FIGS. 1 to 3, the double container 1 according to one embodiment of the present invention includes an outer layer body 10 that constitutes the outer shell of the double container 1 and a It has a double structure with an inner layer body 20 .

The outer layer body 10 has a bottle shape having a substantially cylindrical mouth portion 11, a body portion 12 connected to the lower end of the mouth portion 11, and a bottom portion 13 continuing to the lower end of the body portion 12 and closing the lower end of the body portion 12. It has become. In the illustrated case, the trunk portion 12 has a tapered shoulder portion 12a that gradually expands in diameter downward from the connecting portion with the mouth portion 11, and a cylindrical shape with a substantially constant outer diameter that continues to the lower end of the shoulder portion 12a. and a body portion 12b. The trunk portion 12 has flexibility, and can be elastically deformed into a concave state by being squeezed (pressed) radially inward, and can return to its original shape from the concave state. It can be restored by force.

The inner layer body 20 is formed in a bag-like shape that is thinner and more flexible than the outer layer body 10 , and is detachably laminated on the inner surface of the outer layer body 10 . The opening of the inner layer body 20 is connected to the open end of the mouth portion 11 of the outer layer body 10, and the interior thereof forms a housing space S that continues to the opening. The accommodation space S can accommodate liquid contents such as cosmetics such as lotion, shampoos, rinses, liquid soaps, and food seasonings. The inner layer body 20 can be deformed to reduce its volume, and can be deformed so as to reduce its inner volume while separating from the outer layer body 10 as the contents are poured out from the housing space S.

The mouth portion 11 of the outer layer body 10 is provided with an outside air introduction hole 11a. Although not shown in detail, in the present embodiment, the opening 11 is provided with a pair of outside air introduction holes 11a symmetrically with respect to the central axis thereof. The outside air introduction holes 11a communicate between the outer layer body 10 and the inner layer body 20, respectively. outside air can be introduced between

A shoulder portion 12a of the outer layer body 10 is provided with a plurality of recessed ribs 14 so as to be positioned in a predetermined range below the outside air introduction hole 11a. A plurality of recessed ribs 14 are provided in a predetermined range on the lower side of the outside air introduction hole 11a of the shoulder portion 12a, so that the outer layer body 10 and the inner layer body 20 extend from the outside air introduction hole 11a toward the body portion 12b of the trunk portion 12. An air passage is easily formed between. Note that the concave rib 14 may not be provided.

The bottom portion 13 has an upwardly curved concave portion 13b on the inner peripheral side of an annular outer edge portion 13a serving as a ground contact surface, and a pinch-off portion 15 is provided in the concave portion 13b.

The pinch-off portion 15 protrudes downward from the concave portion 13b, passes through the center of the concave portion 13b, and extends straight so that both ends thereof reach the outer edge portion 13a. The cross-sectional shape of the pinch-off portion 15 is a vertically long rectangular shape, and the height of the downward projection from the recess 13b is within the range of the depth of the recess 13b. As a result, when the double container 1 is in the upright posture, the pinch-off part 15 does not protrude below the outer edge part 13a serving as the ground surface, and the double container 1 is stably installed in the upright posture. can do.

The lower surface of the pinch-off portion 15 is integrally provided with a projecting portion 15a having a substantially triangular cross section. The protruding portion 15a is slightly shorter in length than the pinch-off portion 15, and both end portions thereof have a shape in which the height and width gradually decrease toward the end portions.

Further, the pinch-off portion 15 is provided with a plurality of biting portions 16 that bit into from one side surface toward the other side surface in alternate directions. By providing the biting portion 16, the strength against cracking of the pinch-off portion 15 is further enhanced. It should be noted that the pinch-off portion 15 may be configured without the biting portion 16 .

At the mouth portion 11 of the outer layer body 10, for example, a pouring cap provided with a check valve for pouring and a check valve for the outside air introduction hole 11a, a pouring tool such as various nozzles or a pouring pump ( (illustration omitted) is attached. The pouring tool can be attached by, for example, a screw connection using a male thread 11b provided on the mouth portion 11, but it can also be configured by undercut engagement by plugging. It should be noted that when a pouring pump is attached to the mouth portion 11, the body portion 12 may be structured so as not to be squeezed. Also, the check valve for the outside air introduction hole 11a may be provided directly in the outside air introduction hole 11a.

As in the double container 1 of the present embodiment, when the opening 11 is provided with the outside air introduction hole 11a, a pouring cap or the like provided with a check valve for the outside air introduction hole 11a may be used. Since the outside air introduction hole 11a can be opened and closed by attaching the pouring tool to the mouth part 11, the structure of the double container 1 can be simplified compared to the case where the outside air introduction hole is provided in the body part 12. .

In the double container 1 with a spout cap (not shown) attached to the mouth portion 11, the body portion 12 of the outer layer body 10 is squeezed so that the contents stored in the storage space S of the inner layer body 20 are squeezed out. It can be poured out from the mouth portion 11 . After pouring out the contents, when the squeezing of the body 12 is released and the outer layer body 10 restores its original shape, the check valve for pouring is closed and the outside air introduction hole provided in the mouth 11 is closed. Air (outside air) is introduced between the outer layer body 10 and the inner layer body 20 from 11a, and only the outer layer body 10 can be restored to its original shape while the inner layer body 20 is reduced and deformed. Therefore, when the contents are poured out, the outside air is suppressed from flowing into the containing space S of the inner layer body 20 from the mouth part 11, and the contents contained in the containing space S are hardly exposed to the air and deteriorated. can be suppressed. When the body portion 12 is squeezed to pour out the contents again, the check valve for the outside air introduction hole 11a prevents the air between the outer layer body 10 and the inner layer body 20 from leaking to the outside. , the inner layer body 20 can be pressed by the trunk portion 12 through the air.

Next, the layer structure of the outer layer body 10 and the inner layer body 20 of the double container 1 will be described.

As shown in FIG. 4, the outer layer body 10 has an inner layer 10B laminated inside the main body layer 10A and an outermost layer 10C laminated outside the main body layer 10A. It has a three-layer structure. The average thickness of each layer of the outermost layer 10C/main body layer 10A/inner layer 10B at the trunk portion 12 can be set to, for example, 10 μm/600 to 800 μm/20 μm.

The main body layer 10A is a layer that constitutes the main portion of the outer layer body 10, and is made mainly of polypropylene (PP). By making the main body layer 10A of the outer layer body 10 mainly composed of polypropylene, the outer layer body 10, that is, the double container 1 can be made lighter and the heat resistance of the double container 1 can be improved. Restorability to the original shape after squeeze deformation of the portion 12 can be enhanced.

In the present embodiment, the main body layer 10A is made of polypropylene as the main material, mixed with recycled material. Here, the recycled material refers to recycled resin such as unnecessary offcuts generated when molding the double container 1 and pulverized material obtained by pulverizing the recycled double container 1. is. The cost of the main body layer 10A, that is, the double container 1 can be reduced by making the main body layer 10A into a structure in which recycled materials are mixed.

The inner layer 10</b>B constitutes the innermost layer of the outer layer body 10 , is made of low density polyethylene (LDPE), and can be peeled off from the inner layer body 20 . In addition, the thickness of the inner layer 10B is made thinner than the thickness of the main layer 10A.

In the present embodiment, the inner layer 10B is made of low density polyethylene (LDPE), but not limited to this, for example linear low density polyethylene (LLDPE), high density polyethylene (HDPE), etc. It may be composed mainly of polyethylene (PE), such as being composed of polyethylene other than polyethylene (PE). In addition, the inner layer 10B may have a structure in which other materials are mixed with polyethylene as long as the main material is polyethylene. In addition, by making the body layer 10A of the outer layer body 10 mainly made of polypropylene, the recovery of the trunk portion 12 to its original shape after squeeze deformation is enhanced, but the trunk portion 12 becomes too hard and does not cause the deformation. In order to prevent the squeezability of the body portion 12 from deteriorating, the inner layer 10B is more preferably made of low-density polyethylene or linear low-density polyethylene.

The outermost layer 10C constitutes the outermost layer of the outer layer body 10, is made of linear low-density polyethylene (LLDPE), and has a thickness smaller than that of the main body layer 10A. Note that the outermost layer 10C is not limited to linear low-density polyethylene, and may be made of other polyethylene such as low-density polyethylene or high-density polyethylene.

The outer layer body 10 may be configured without the outermost layer 10C. By providing the , it is possible to prevent the layer in which the recycled material is mixed from being exposed on the surface of the outer layer body 10 , that is, the double container 1 , thereby improving the appearance of the double container 1 .

The inner layer body 20 has a three-layer structure including an innermost layer 20A and a barrier layer 20C laminated and adhered to the outer side of the innermost layer 20A with an adhesive layer 20B. The average thickness of each layer of the barrier layer 20C/adhesive layer 20B/innermost layer 20A in the body portion 12 can be, for example, 15 μm/10 μm/50 μm.

The innermost layer 20A is made of linear low-density polyethylene. As a result, the inner layer body 20 can be flexibly reduced in volume and deformed. In addition, the innermost layer 20A is not limited to linear low-density polyethylene, and may be made of other polyethylene such as low-density polyethylene or high-density polyethylene.

The barrier layer 20C is made of EVOH (ethylene-vinyl alcohol copolymer). Since the barrier layer 20C is made of EVOH, the gas barrier property of the inner layer body 20 is enhanced.

The inner layer body 20 is releasably laminated on the inner surface of the inner layer 10B of the outer layer body 10 made of polyethylene in the barrier layer 20C. It is possible to improve the releasability from the outer layer body 10 so that the inner layer body 20 can be easily and reliably detached from the outer layer body 10 .

The EVOH constituting the barrier layer 20C may be made more flexible by adding other components, or may be made of ethylene, which is a copolymer component, so as to have desired flexibility and gas barrier properties. It is also possible to adopt one in which the content is appropriately changed.

The adhesive layer 20B for adhering the barrier layer 20C to the innermost layer 20A can be made of, for example, a modified polyolefin resin (“ADMER” (registered trademark)).

The double container 1 having the above structure is formed by co-extrusion of a synthetic resin layer having a layer structure corresponding to the outer layer body 10 and a synthetic resin layer having a layer structure corresponding to the inner layer body 20 to form a cylindrical laminated parison. By subjecting this laminated parison to extrusion blow molding using a left-right split mold, a delaminated container in which the inner layer body 20 is detachably laminated on the inner surface of the outer layer body 10 is constructed. The mold used for extrusion blow molding is not limited to the left and right split type, and if it is a mold that is divided into at least two or more, for example, a mold that is divided into three directions or a mold that is divided into four directions. A mold or the like can also be used.

In addition, by forming the double container 1 by blow molding using left and right split molds, as shown in FIG. A pair of parting lines PL (only one line is shown in FIG. 2) are formed extending along the dividing planes. These parting lines PL each extend from the mouth portion 11 through the body portion 12 to the bottom portion 13 on the side surface of the outer layer body 10, and as shown in FIG. connected to both ends. That is, the pinch-off portion 15 extends along the parting line PL.

The pinch-off portion 15 is formed in the bottom portion 13 of the double container 1 in the shape of a ridge by crushing and biting off the cylindrical laminated parison by the mold in the extrusion blow molding described above to close the opening. It is formed. Therefore, the double container 1 has a configuration in which the outer layer body 10 and the inner layer body 20 are laminated even at the pinch-off portion 15 .

Here, in the double container 1 of the present embodiment, the body layer 10A of the outer layer body 10 is mainly made of polypropylene, which is relatively hard. Since the inner layer 10B mainly made of polyethylene is laminated, even if the double container 1 is dropped and the pinch-off portion 15 is subjected to an impact, the inner layer 10B and the inner layer body 20 can be kept in place. The load applied to the pinch-off portion 15 can be absorbed by the inner layer 10B made of relatively soft polyethylene, and cracking of the pinch-off portion 15 can be suppressed.

In particular, when the inner layer 10B is made of low-density polyethylene or linear low-density polyethylene, the load applied between the inner layer 10B and the inner layer body 20 is more effectively absorbed by the inner layer 10B. By doing so, it is possible to more reliably prevent the pinch-off portion 15 from cracking. Further, even if the main body layer 10A of the outer layer body 10 is made mainly of relatively hard polypropylene, the inner layer 10B can be made of softer low-density polyethylene or linear low-density polyethylene. By doing so, deterioration of the squeezability of the body portion 12 of the double container 1 can be suppressed.

Further, as shown in FIG. 5, in the double container 1 of the present embodiment, the outer layer body 10 is formed by laminating an inner layer 10B mainly made of polyethylene inside a main body layer 10A mainly made of polypropylene. By forming the double container 1 by the extrusion blow molding, the inner layer body 20 is covered with the inner layer 10B at the lower end of the pinch-off portion 15. As shown in FIG. That is, in the double container 1 of the present embodiment, the outermost barrier layer 20C of the inner layer body 20 is covered with the inner layer 10B at the lower end of the pinch-off portion 15 so as not to be exposed to the outside.

In particular, when the projecting portion 15a is provided on the lower surface of the pinch-off portion 15, the inner layer 10B is guided by the projecting portion 15a at the lower end of the pinch-off portion 15 and exposed to the outside at the projecting portion 15a. The lower end of the barrier layer 20C of the body 20 is positioned so that the inner layer 10B is brought into close contact with the lower end of the pinch-off portion 15, and the inner layer 10B is reliably covered with the inner layer 10B at the lower end of the pinch-off portion 15. can.

In FIG. 5, for the sake of convenience, the layer structure other than the inner layer 10B constituting the outer layer body 10 and the barrier layer 20C constituting the inner layer body 20 is simply shown.

As described above, in the double container 1 of the present embodiment, even when the body layer 10A of the outer layer body 10 is mainly made of polypropylene, the inside of the body layer 10A is mainly made of polyethylene. The inner layer 10B is laminated, and the lower end of the pinch-off portion 15 is covered with the inner layer 10B. As a material having strength, it is possible to more reliably suppress cracks in the pinch-off portion 15 .

As shown in FIG. 4, the double container 1 can also have a configuration in which an adhesive band layer 30 is provided between the outer layer body 10 and the inner layer body 20 to bond the outer layer body 10 and the inner layer body 20 to each other. . In this case, the adhesive strip layer 30 can be composed of, for example, a modified polyolefin resin ("Admer" (registered trademark)).

In this embodiment, two adhesive layers 30 are provided on both sides of the double container 1 along the parting line PL, extending from the mouth portion 11 to the bottom portion 13 and reaching the pinch-off portion 15. ing. By providing such an adhesive band layer 30, the inner layer body 20 is distorted and deformed so that the inner layer body 20 is distorted and deformed so that the inner layer body 20 is deformed into a flat shape when the content is poured out. It is possible to suppress the content from remaining without being poured out inside.

In order to confirm the effect of the double container 1 of the present embodiment, the outer layer body was arranged from the outside to the inside, linear low-density polyethylene (outermost layer) / low-density polyethylene + recycled material (main body layer) / low-density polyethylene. In addition to having a three-layer structure of density polyethylene (inner layer), the inner layer body has three layers of barrier layer (EVOH layer) / adhesive (adhesive layer) / linear low density polyethylene (innermost layer) from the outside to the inside. A double container of Comparative Example 1 having a structure and a pair of adhesive strip layers provided therebetween, and a linear low-density polyethylene (outermost layer) / It has a three-layer structure of polypropylene + recycled material (main body layer) / polypropylene (inner layer), and the inner layer is composed of barrier layer (EVOH layer) / adhesive (adhesive layer) / linear low density from the outside to the inside. A double container of Comparative Example 2 having a three-layer structure of polyethylene (innermost layer) and a pair of adhesive strip layers provided between them, and a linear It has a three-layer structure of low-density polyethylene (outermost layer) / polypropylene + recycled material (body layer) / low-density polyethylene (inner layer), and the inner layer is a barrier layer (EVOH layer) / adhesive from the outside to the inside. (adhesive layer) / linear low-density polyethylene (innermost layer) The double container of Example 1, which has a three-layer structure with a pair of adhesive band layers provided between them, and the outer layer body From the outside to the inside, it has a three-layer structure of linear low-density polyethylene (outermost layer) / polypropylene + recycled material (body layer) / linear low-density polyethylene (inner layer). It has a three-layer structure of a barrier layer (EVOH layer)/adhesive (adhesive layer)/linear low-density polyethylene (innermost layer) facing inward, with a pair of adhesive band layers provided between them. The double container of Example 1 was prepared, and the strength of the pinch-off portion was measured for these.

The strength of the pinch-off portion was measured using a precision universal testing machine (Autograph manufactured by Shimadzu Corporation) at a test speed of 50 mm/min. The load is applied to the pinch-off part by using a round bar with a diameter of 15 mm to apply a load from a direction parallel to the parting line to the pinch-off part in its longitudinal direction. and "center push" in which a load is applied in the direction along the central axis of the double container 1 to the central portion of the pinch-off portion in the longitudinal direction (the central portion of the bottom portion). For the pinch-off strength and displacement, when the pinch-off part cracked, the strength and displacement when the pinch-off part cracked were measured, and when the pinch-off part did not crack, the strength and displacement when the pinch-off part buckled were measured. The above strength measurement was performed with an N number of 5, and the rate of occurrence of cracking at the pinch-off portion was calculated. Table 1 shows the measurement results.

From Table 1, in the double container of Comparative Example 2 in which polypropylene was used for the main body layer and the inner layer of the outer layer, the occurrence rate of cracking at the pinch-off portion was lower in both "PL parallel press" and "center press". While it was 100%, in the double containers of Examples 1 and 2 in which polypropylene was used for the main body layer of the outer layer body and polyethylene was used for the inner layer, in either case of "PL parallel press" and "center press" However, no cracks occurred in the pinch-off portion. From this, it can be confirmed that cracking of the pinch-off portion is suppressed in the double containers of Examples 1 and 2, as compared with the double container of Comparative Example 2 in which polypropylene is used for the main body layer and the inner layer of the outer layer. rice field.

In the double container of Comparative Example 1, in which polyethylene was used for the main body layer and the inner layer of the outer layer, cracks did not occur in the pinch-off portion in either case of "PL parallel push" or "center push", but the double container of Comparative Example 1 did not crack. It was found that the double containers of Nos. 1 and 2 both have higher strength at the pinch-off portion than the double container of Comparative Example 1, and can withstand larger loads without causing buckling. .

It goes without saying that the present invention is not limited to the above-described embodiments, and that various modifications can be made without departing from the spirit of the present invention.

For example, in the above-described embodiment, the main body layer 10A is composed of polypropylene mixed with a recycled material.

Further, in the above embodiment, the outermost layer 10C is provided outside the body layer 10A of the outer layer body 10, but the outermost layer 10C may not be provided.

Furthermore, in the above embodiment, the outside air introduction hole 11a is provided in the mouth portion 11, but the outside air introduction hole 11a may be provided anywhere other than the bottom portion 13, such as the body portion 12. In addition, the number and shape of them can be changed variously. note that,

Furthermore, in the above-described embodiment, a pair of adhesive strips 30 are provided on both sides of the double container 1, but only one adhesive strip 30 may be provided. A configuration in which the band layer 30 is not provided is also possible.

Further, the double container 1 is not limited to the configuration in which the contents are poured out by squeezing the body portion 12, but by tilting the outer layer body 10 so that the mouth portion 11 faces downward, the inner layer body 20 is inserted into the storage space S. It is also possible to adopt a configuration in which the contained contents are poured out from the mouth portion 11 by its own weight. Alternatively, a pouring tool having a pump may be attached to the mouth portion 11, and the pump may be operated to pour out the contents. In this case, the outer layer body 10 has flexibility. You can also use what you don't have.

1 double container 10 outer layer body 10A body layer 10B inner layer 10C outermost layer 11 mouth portion 11a outside air introduction hole 11b male screw 12 body portion 12a shoulder portion 12b body portion 13 bottom portion 13a outer edge portion 13b concave portion 14 concave rib 15 pinch-off portion 15a projection Portion 16 Biting portion 20 Inner layer body 20A Innermost layer 20B Adhesive layer 20C Barrier layer 30 Adhesive band layer S Accommodation space PL Parting line

Claims (6)

a bottle-shaped outer layer body having a mouth, a body and a bottom;
a volume-reducing and deformable inner layer body housed inside the outer layer body;
A double container having a ridge-shaped pinch-off portion provided at the bottom,
The outer layer body is
a body layer composed mainly of polypropylene;
an inner layer composed mainly of polyethylene, laminated inside the main body layer and laminated detachably from the inner layer body ,
The inner layer is exposed to the outside at the lower end of the pinch-off portion,
A double container , wherein the inner layer body is covered with the inner layer at the lower end of the pinch-off portion . 2. The double container according to claim 1, wherein the inner layer is mainly composed of low density polyethylene or linear low density polyethylene. 3. Double container according to claim 1 or 2 , wherein the inner layer body has a barrier layer composed of EVOH and laminated inside the inner layer. The double container according to any one of claims 1 to 3 , wherein an outermost layer mainly made of polyethylene is laminated on the outer side of the main body layer. The double container according to any one of claims 1 to 4 , wherein at least one adhesive band layer extending from the mouth to the bottom is provided between the outer layer body and the inner layer body. . The double container according to any one of claims 1 to 5 , wherein an outside air introduction hole for introducing outside air between the outer layer body and the inner layer body is provided in the mouth portion or the body portion.

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