JP6794251B2 - Double container - Google Patents

Description

The present invention has a bottle shape having a mouth, a body and a bottom, and is formed on an outer layer forming the outer shell of a container, a volume-reducing deformable inner layer housed inside the outer layer, and a bottom. The present invention relates to a double container having a ridge-shaped pinch-off portion.

As a container for storing cosmetics such as lotion, shampoo, rinse or liquid soap, or liquid contents such as food seasonings, it has a bottle shape with a mouth, body and bottom, and the outer shell of the container. It is provided with an outer layer body that forms the outer layer body and an inner layer body that can be reduced in volume and deformable to be housed inside the outer layer body, and while the inner layer body is reduced in volume and deformed to discharge the contents, it is provided through an air introduction hole provided in the outer layer body. A double container is known in which the outer shape of the outer layer can be restored to the original shape while the inner layer is reduced in volume and deformed by introducing air between the inner layer and the outer layer. (See, for example, Patent Document 1). Since this type of container can pour out the contents without replacing with air, it is possible to reduce the contact of the contents with air in the container and suppress the deterioration and deterioration of the contents. Can be done.

Japanese Unexamined Patent Publication No. 2013-151316

As the double container as described above, a laminated peeling container, which is also called a delamination container, which is formed by extrusion blow molding a laminated parison using a mold is known. In this case, in the double container, the synthetic resin for the outer layer and the synthetic resin for the inner layer, which have low compatibility, are co-extruded to form a cylindrical laminated parison, and this laminated parison is blown using a left-right split mold. By molding, the inner layer is formed into a structure in which the inner layer is laminated on the inner surface of the outer layer. At this time, the cylindrical laminated parison is crushed by the mold and the 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 on the injection cap or the like attached to the mouth portion allows air between the outer layer body and the inner layer body to flow from the air introduction hole when the body is squeezed. The inner layer is indirectly pressed against the body through the air to prevent the contents from leaking to the outside, and the air introduction hole is released when the squeeze of the body is released. Is opened so that outside air is introduced between the outer layer body and the inner layer body so that only the outer layer body is restored to the original shape while the inner layer body is reduced in volume and deformed.

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 prevented from leaking the air between the outer layer and the inner layer to the outside. Must be held between and. Therefore, when the container is dropped and an impact or the like is applied to the pinch-off portion provided at the bottom of the container and the pinch-off portion is cracked, the body of the outer layer is squeezed in order to eject the contents. However, there arises a problem that the air between the outer layer body and the inner layer body leaks from the pinch-off portion to the outside, the internal pressure of the air does not increase, and the contents cannot be poured out.

Conventionally, since a relatively soft resin material (low density polyethylene or the like) has been used as the material constituting the outer layer body, it has been difficult for the pinch-off portion to crack due to an impact or the like. However, in order to ensure the heat resistance of the container, for example, when a relatively hard resin material such as polypropylene is used for the outer layer, the pinch-off portion cracks when an impact or the like is applied, and the contents are poured. There was a risk that it would be difficult to put it out.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a double container in which a pinch-off portion is less likely to be cracked.

The double container of the present invention has a bottle shape having a mouth, a body and a bottom, and has an outer layer that forms the outer shell of the container, and a volume-reducing and deformable inner layer that is housed inside the outer layer. A double container having a ridge-shaped pinch-off portion formed on the bottom portion, wherein the pinch-off portion includes a base portion extending along the bottom portion and a first vertical wall portion extending downward from the base portion. At one side end, the first horizontal wall portion is integrally connected to the lower end of the first vertical wall portion and extends horizontally from the lower end of the first vertical wall portion, and at the upper end, it is integrally connected to the other side end of the first horizontal wall portion. A second vertical wall portion extending downward from the other side end of the first horizontal wall portion and one side end integrally connected to the lower end of the second vertical wall portion, horizontally from the lower end of the second vertical wall portion. a second lateral wall portion opposed to the first lateral wall portion extending, have a, the first vertical wall portion, the first lateral wall portion, the second vertical wall portion and the second lateral wall portion characterized that you have each extend over the entire range longitudinal direction of the pinch off portion reaches the longitudinal end portions of the pinch off portion.

In the double container of the present invention, in the above configuration, it is preferable that the pinch-off portion is formed in a straight line passing through the axis of the bottom portion in a bottom view.

In the above configuration, the double container of the present invention preferably has at least one adhesive band layer extending from the mouth portion to the bottom portion between the outer layer body and the inner layer body.

In the double container of the present invention, it is preferable that the outer layer body contains a polypropylene layer in the above configuration.

In the double container of the present invention, in the above configuration, the outer layer has a layer structure of a low density polyethylene layer / recycled material layer / polypropylene layer from the outside to the inside, and the inner layer is from the outside to the inside. It is preferable to have a layer structure of an EVOH layer / an adhesive layer / a low-density polyethylene layer.

In the above configuration, the double container of the present invention preferably has a thickness of the first vertical wall portion and the thickness of the second vertical wall portion thinner than the thickness of the first horizontal wall portion and the second horizontal wall 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.

It is a front view which shows by cutting out a part of the double container which concerns on one Embodiment of this invention. It is a bottom view of the double container shown in FIG. It is an enlarged front view which shows the bottom of the double container shown in FIG. 1 enlarged. It is an enlarged side view which shows the bottom of the double container shown in FIG. 1 enlarged. It is sectional drawing which follows the AA line in FIG.

Hereinafter, the double container 1 according to the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 5.

In the scope of the present specification and claims, the vertical direction means upward and downward in a state where the double container 1 is in an upright posture 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 FIG. 1, the double container 1 according to the embodiment of the present invention includes an outer layer body 10 constituting the outer shell of the container and an inner layer body 20 housed inside the outer layer body 10. It has a double structure.

The outer layer body 10 is a bottle having a substantially cylindrical mouth portion 11, a substantially cylindrical body portion 12 connected to the lower end of the mouth portion 11, and a bottom portion 13 connected to the lower end of the body portion 12 and closing the body portion 12. It is in the shape. In the case shown in the figure, the body portion 12 is formed to have a larger diameter than the mouth portion 11, and the shoulder portion 14 having an enlarged diameter is formed between the mouth portion 11 and the body portion 12. The body portion 12 has flexibility, and can be elastically deformed into a dented state by being squeezed (pressed) inward in the radial direction, and at the same time, its own elasticity from the dented state to the original shape. It can be restored by force. Further, an air introduction hole 11a is provided in the mouth portion 11 of the outer layer body 10. The air introduction hole 11a communicates between the outer layer body 10 and the inner layer body 20, and outside air can be introduced between the outer layer body 10 and the inner layer body 20.

The outer layer body 10 can be made of various resin materials such as polyethylene (PE), polyethylene terephthalate (PET), and polypropylene (PP). Further, the outer layer body 10 may have a laminated structure in which a plurality of layers made of different materials are laminated. In the present embodiment, the outer layer body 10 has a laminated structure including a polypropylene layer in order to enhance the heat resistance of the double container 1. More specifically, the outer layer body 10 has a laminated structure having a layer structure in which a low-density polyethylene layer / a recycled material layer / a polypropylene layer is laminated in this order from the outside to the inside of the double container 1. The recycled material layer is a layer made of recycled resin such as a member (mill ends or the like) that is no longer needed when molding the double container 1 or a member that has been recycled and crushed. In the present embodiment, the thickness of the low-density polyethylene layer is 10 μm, the thickness of the recycled material layer is 600 to 800 μm, and the thickness of the polypropylene layer is 20 μm. The layer structure of the outer layer body 10 is not limited to the above, and can be variously changed including the layer thickness depending on the use of the double container 1 and the like. For example, the low-density polyethylene layer can be changed to a polypropylene layer, a high-density polyethylene layer, a medium-density polyethylene layer, a linear low-density polyethylene layer, or the like. Further, the polypropylene layer can be changed to a high-density polyethylene layer, a medium-density polyethylene layer, a linear low-density polyethylene layer, or the like.

The inner layer body 20 is formed in a bag shape that is thinner and more flexible than the outer layer body 10, and is detachably adhered to the inner surface of the outer layer body 10 on the outer surface thereof. The opening of the inner layer 20 is connected to the opening end of the mouth 11 of the outer layer 10, and the inside thereof is a storage space S connected to the opening. In the storage space S, for example, cosmetics such as lotion, shampoo, conditioner or liquid soap, or liquid contents such as food seasonings can be stored. The inner layer body 20 is deformable in terms of volume, and can be deformed so as to reduce the inner volume while peeling from the outer layer body 10 as the contents are poured out from the accommodation space S.

The inner layer 20 can be made of a flexible resin material such as EVOH (ethylene-vinyl alcohol copolymer) resin or nylon. Further, the inner layer body 20 may have a laminated structure in which a plurality of layers made of different materials are laminated. In the present embodiment, the inner layer body 20 has a laminated structure having a layer structure in which an EVOH layer / an adhesive layer / a low-density polyethylene layer are laminated in this order from the outside to the inside of the double container 1. As the adhesive layer, for example, a modified polyolefin resin (“Admer” (registered trademark)) can be used. In the present embodiment, the thickness of the EVOH layer is 15 μm, the thickness of the adhesive layer is 10 μm, and the thickness of the low-density polyethylene layer is 50 μm. The layer structure of the inner layer body 20 is not limited to the above, and can be variously changed including the layer thickness depending on the use of the double container 1 and the like. For example, the EVOH layer can be changed to a layer made of an EVOH resin having increased flexibility by adding other components. Further, the ethylene content, which is a copolymerization component of EVOH, can be changed according to the desired barrier property. The low-density polyethylene layer can be changed to a polypropylene layer, a high-density polyethylene layer, a medium-density polyethylene layer, a linear low-density polyethylene layer, an EVOH layer, or the like.

In the present embodiment, the double container 1 coextrudes the synthetic resin layer for the outer layer 10 and the synthetic resin layer for the inner layer 20 having the above layer structure to form a cylindrical laminated parison, and the laminated parison is formed. By blow molding (extrusion blow molding) of the parison using a left and right split mold, the inner layer 20 is detachably adhered to the inner surface of the outer layer 10 to form a laminated structure, which is also called a delamination container. It is configured as a container. By blow molding using the left and right split molds, a parting line 15 extending along the split surface of the mold is formed on the side surface of the outer layer 10. The parting line 15 extends from the mouth portion 11 to the bottom portion 13 through the body portion 12 on the side surface of the outer layer body 10.

The bottom 13 of the double container 1 is provided with a ridge-shaped pinch-off portion 30 by crushing and cutting off a cylindrical laminated parison by a mold to close the opening thereof. The pinch-off portion 30 is connected to the parting line 15 and is formed so as to extend linearly so as to pass through the axial center of the bottom portion 13 in the bottom view shown in FIG. The detailed structure of the pinch-off portion 30 will be described later.

An adhesive band layer 40 that joins the outer layer body 10 and the inner layer body 20 to each other may be provided between the outer layer body 10 and the inner layer body 20. The adhesive band layer 40 can be made of, for example, a modified polyolefin resin (“Admer” (registered trademark)). The thickness of the adhesive band layer 40 was set to 10 μm.

As shown in FIGS. 2 and 4, in the present embodiment, the double container 1 is paired with a parting line 15 sandwiched between them and extends from the mouth portion 11 to the bottom portion 13 and the pinch-off portion 30. Two adhesive band layers 40 are provided so as to reach the end of the surface. By providing such an adhesive band layer 40, the inner layer body 20 is reduced in volume and deformed into a flat shape when the contents are poured out, and the inner layer body 20 is distorted and deformed to form the inner layer body 20. It is possible to prevent the contents from remaining without being poured into the inside. It is sufficient that at least one adhesive band layer 40 is provided.

A pouring tool such as a pouring cap, various nozzles, or a pouring pump in which a pouring valve and a check valve for the air introduction hole 11a are arranged is provided at the mouth portion 11 of the double container 1, for example (not shown). ) Is installed. The injection tool can be attached, for example, by undercut engagement with a plug, but it can also be attached by screw connection. In the double container 1, the contents are poured from the mouth portion 11 by squeezing the body portion 12 of the outer layer body 10 by attaching an ejection cap having an outlet valve provided to the mouth portion 11. Can be put out. When the outer layer body 10 is restored to its original shape after the contents are poured out, air (outside air) flows in between the outer layer body 10 and the inner layer body 20 through the air introduction hole 11a provided in the mouth portion 11. Only the outer layer 10 can be restored to its original shape while the inner layer 20 is reduced in volume and deformed. Therefore, when the contents are poured out, it is prevented that air flows from the mouth portion 11 into the accommodation space S of the inner layer body 20, and the contents contained in the accommodation space S are made difficult to touch the air. Deterioration can be prevented. When the body portion 12 is squeezed to eject the contents again, the check valve for the 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 20 can be pressed by the body 12 through the air between them. In addition, by tilting the outer layer body 10, the contents housed in the storage space S of the inner layer body 20 can be ejected from the mouth portion 11 by its own weight. Further, when a pouring tool provided with a pump is attached to the mouth portion 11, a non-flexible outer layer body 10 can be used.

As shown in FIGS. 1 to 4, the bottom portion 13 has an annular outer edge portion 13a serving as a ground contact surface, and a recess 13b that curves upward in a dome shape on the inner peripheral side of the outer edge portion 13a. The pinch-off portion 30 described above is provided in the portion of. The pinch-off portion 30 passes through the center of the recess 13b, and both ends of the pinch-off portion 30 reach the vicinity of the outer edge portion 13a, and a straight protrusion having a height within the depth range of the recess 13b (does not protrude below the outer edge portion 13a). It has a strip shape.

As shown in FIG. 5, the pinch-off portion 30 has a folded cross-sectional shape (crank shape). That is, the pinch-off portion 30 includes a base portion 31 having a substantially rectangular cross section extending along the recess 13b, a first vertical wall portion 32 extending downward from the base portion 31, and a lower end of the first vertical wall portion 32 at one side end. The first horizontal wall portion 33 extending horizontally (diameterally) from the lower end of the first vertical wall portion 32, and the first horizontal wall portion 33 at the upper end, integrally connected to the other end of the first horizontal wall portion 33. A second vertical wall portion 34 extending downward from the other side end, and a first horizontal wall portion 33 extending horizontally from the lower end of the second vertical wall portion 34 so as to be integrally connected to the lower end of the second vertical wall portion 34 at one side end. It is formed in a shape having a second horizontal wall portion 35 arranged so as to face each other. By having the above-mentioned folding shape, the pinch-off portion 30 is easily elastically deformed so that the angle formed by each of the wall portions 32 to 35 with respect to the base portion 31 and the other wall portions 32 to 35 increases or decreases. Can be done.

The first vertical wall portion 32 and the second vertical wall portion 34 are substantially parallel to each other, and the first horizontal wall portion 33 and the second horizontal wall portion 35 are substantially parallel to each other. Further, the thicknesses of the first vertical wall portion 32 and the second vertical wall portion 34 are substantially the same, and the thicknesses of the first horizontal wall portion 33 and the second horizontal wall portion 35 are substantially the same. Further, the thickness of the first vertical wall portion 32 and the thickness of the second vertical wall portion 34 is thinner than the thickness of the first horizontal wall portion 33 and the second horizontal wall portion 35. With such a configuration, in the pinch-off portion 30, the thinly formed first vertical wall portion 32 and the second vertical wall portion 34 are more easily elastically deformed, so that the distance between the base portion 31 and the first horizontal wall portion 33 is formed. And, it can be more easily elastically deformed in the vertical direction so as to narrow the distance between the first horizontal wall portion 33 and the second horizontal wall portion 35.

Further, since the recess 13b has a shape that curves upward in a dome shape, the pinch-off portion 30 has a base portion 31, a first vertical wall portion 32, a first horizontal wall portion 33, and a second pinch-off portion 30 toward both ends thereof. The vertical wall portion 34 and the second horizontal wall portion 35 are gradually integrated into the recess 13b in this order, but in the present embodiment, as shown in FIG. 3, the base portion 31, the first vertical wall portion 32, and the first The horizontal wall portion 33, the second vertical wall portion 34, and the second horizontal wall portion 35 each have a shape that is slightly curved so that the center side is on the upper side with a curvature smaller than that of the recess 13b. As a result, the range of the pinch-off portion 30 having the above-mentioned folding shape can be widened.

Although details are not shown in FIG. 5, the recess 13b of the bottom portion 13 and the pinch-off portion 30 also have a configuration in which the outer layer body 10 and the inner layer body 20 are laminated. Further, on the lower surface of the second lateral wall portion 35, a protrusion 36 having a triangular cross section is integrally provided along the center thereof.

As described above, in the double container 1 according to the present embodiment, since the pinch-off portion 30 has the above-mentioned folded shape, the outer layer body 10 includes a relatively hard polypropylene layer as in the present embodiment. Even in the case of the configuration, when a large impact or the like is applied to the pinch-off portion 30 by dropping the double container 1 with the contents contained therein, the impact is applied to the pinch-off portion 30. It can be absorbed by elastic deformation to prevent the pinch-off portion 30 from cracking.

In particular, when a load is applied to the pinch-off portion 30 upward from the center position of the bottom portion 13, the pinch-off portion 30 causes the distance between the base portion 31 and the first lateral wall portion 33 and the distance between the first lateral wall portion 33 and the second lateral wall portion 33. It can be elastically deformed in the vertical direction so as to narrow the distance from the side wall portion 35, effectively absorb the load, and reliably prevent the pinch-off portion 30 from cracking. In this case, the pinch-off portion 30 is more elastic in the vertical direction by making the thickness of the first vertical wall portion 32 and the second vertical wall portion 34 thinner than the thickness of the first horizontal wall portion 33 and the second horizontal wall portion 35. It is easy to deform, and it is possible to more reliably prevent the pinch-off portion 30 from cracking.

Further, in the double container 1 of the present embodiment, the base portion 31, the first vertical wall portion 32, the first horizontal wall portion 33, and the second portion forming the pinch-off portion 30 are provided with respect to the concave portion 13b curved in an upward dome shape. The vertical wall portion 34 and the second horizontal wall portion 35 are shaped to be slightly curved so that the center side is on the upper side with a curvature smaller than that of the recess 13b, respectively, so that the range of the pinch-off portion 30 having the above-mentioned folding shape is widened. Therefore, the pinch-off portion 30 can be effectively elastically deformed against loads or impacts applied to various portions of the bottom portion 13 from various directions, and the loads or impacts can be absorbed.

Further, when the outer layer body 10 and the inner layer body 20 are laminated in the recess 13b of the bottom portion 13 and the pinch-off portion 30 as in the double container 1 of the present embodiment, there are a plurality of stages of the pinch-off portion 30. By bending the outer layer body 10 and the inner layer body 20, the outer layer body 10 and the inner layer body 20 are surely brought into close contact with each other, and the outer layer body 10 and the inner layer body 20 are separated from each other and communicate between the outer layer body 10 and the inner layer body 20 at the pinch-off portion 30. It is also possible to prevent the formation of a gap.

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

For example, in the above-described embodiment, the double container 1 is formed by extrusion blow molding, but the present invention is not limited to this, and for example, a preform having a laminated structure previously formed by injection molding or the like is blown by biaxial stretching. It may be formed by molding. Further, the double container 1 may be formed by forming the outer layer body 10 and the inner layer body 20 separately and then incorporating the inner layer body 20 into the outer layer body 10.

Further, in the above-described embodiment, the air introduction hole 11a is provided in the mouth portion 11, but the air introduction hole 11a may be provided in a portion other than the mouth portion 11 such as the body portion 12. The number and shape can be changed in various ways.

1 Double container 10 Outer layer 11 Outer layer 11 Mouth 11a Air introduction hole 12 Body 13 Bottom 13a Outer edge 13b Recess 14 Shoulder 15 Parting line 20 Inner layer 30 Pinch-off 31 Base 32 1st vertical wall 33 1st horizontal wall Part 34 Second vertical wall part 35 Second horizontal wall part 36 Protrusion 40 Adhesive band layer S Containment space

Claims (6)

A bottle-shaped outer layer having a mouth, a body and a bottom, an outer layer forming the outer shell of the container, a volume-reducing deformable inner layer housed inside the outer layer, and a ridge formed on the bottom. A double container with a shaped pinch-off section
The pinch-off portion is
A base extending along the bottom and
The first vertical wall portion extending downward from the base portion and
A first horizontal wall portion that is integrally connected to the lower end of the first vertical wall portion at one side end and extends horizontally from the lower end of the first vertical wall portion.
At the upper end, a second vertical wall portion that is integrally connected to the other side end of the first horizontal wall portion and extends downward from the other side end of the first horizontal wall portion.
It has a second horizontal wall portion that is integrally connected to the lower end of the second vertical wall portion at one side end, extends horizontally from the lower end of the second vertical wall portion, and is arranged so as to face the first horizontal wall portion. And
The first vertical wall portion, the first horizontal wall portion, the second vertical wall portion, and the second horizontal wall portion each extend over the entire longitudinal direction of the pinch-off portion and end in the longitudinal direction of the pinch-off portion. double container, characterized that you have reached the section. The double container according to claim 1, wherein the pinch-off portion is formed in a straight line passing through the axis of the bottom portion in a bottom view. The double container according to claim 1 or 2, wherein 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. The double container according to any one of claims 1 to 3, wherein the outer layer body contains a polypropylene layer. The outer layer body has a layer structure of a low density polyethylene layer / a recycled material layer / a polypropylene layer from the outside to the inside.
The double container according to claim 4, wherein the inner layer has a layer structure of an EVOH layer / an adhesive layer / a low-density polyethylene layer from the outside to the inside. The double container according to any one of claims 1 to 5, wherein the thickness of the first vertical wall portion and the thickness of the second vertical wall portion is thinner than the thickness of the first horizontal wall portion and the second horizontal wall portion. ..

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