JP6219187B2 - Delamination container - Google Patents

Description

  The present invention relates to a delamination container in which an inner layer body is detachably laminated on an inner surface of an outer layer body.

  As a container for storing cosmetics such as lotion, shampoo, rinse, liquid soap, food seasoning, and the like, a delamination container called a delamination container is known (for example, see Patent Document 1).

  Such a delamination container includes an outer layer body formed in a bottle shape having a mouth portion and a body portion, and an inner layer body layered in a peelable manner on the inner surface of the outer layer body, and the body portion of the outer layer body is provided. By pressing (squeezing) the content liquid contained inside the inner layer body can be poured out, and after releasing the pressure, the outer layer body and the inner layer body are released from the open air introduction hole provided in the outer layer body. The outer layer body can be restored to the original shape while reducing the volume of the inner layer body by introducing outside air between the two. In this way, since the content liquid can be poured out without replacing it with the outside air, the content liquid remaining in the container is difficult to come into contact with the air, and its deterioration and alteration can be suppressed.

  Conventionally, for example, polypropylene (PP) or polyethylene (PE) is a laminated release container, and nylon or ethylene-vinyl alcohol copolymer resin (EVOH) that has low compatibility with the resin material for the outer layer, such as resin material for the outer layer. ), And a resin material for inner layer bodies such as polyethylene terephthalate are coextruded to form a cylindrical laminated parison, and one end of this laminated parison is clogged with a mold, and in this state, It was formed into a predetermined shape by direct blow molding in which air was supplied from the end.

JP 2012-116516 A

  However, in a configuration in which a laminated parison obtained by coextruding a resin material for an outer layer body and a resin material for an inner layer body is directly blow-molded as in a conventional delamination container, the outer layer body However, the resin material for the inner layer and the resin material for the inner layer body are not sufficiently stretched, so that there is a problem that the container after blow molding becomes translucent and it is difficult to visually confirm the inside of the container.

  This invention makes it a subject to solve such a point, The objective is to provide the lamination peeling container which is transparent and is easy to confirm the inside visually.

The delamination container of the present invention is formed of a resin material into a shape having a cylindrical mouth portion and a body portion continuous to the mouth portion, and is provided with an outer layer body provided with an opening for introducing outside air, and the outer layer body, An inner layer body that is formed thinner than the outer layer body by the same resin material and is laminated on the inner surface of the outer layer body so as to be peelable from the outer layer body, and a resin material that forms the outer layer body and the inner layer body A resin layer formed of a resin material of a different type from the outer layer body and an intermediate layer disposed between the outer layer body and the inner layer body, and forming the outer layer body by co-injection molding, the inner layer body A preform formed in a multilayer structure including a resin layer forming a resin layer and a resin layer forming the intermediate layer is formed into a predetermined shape by biaxial stretching blow molding , and the thickness of the outer layer body and the the ratio of the thickness of the inner layer body 9: 1 to 3: Ru in der 2 range And wherein the door.

  In the laminated peeling container of the present invention, in the above configuration, the outer layer body and the inner layer body are preferably formed of polyethylene terephthalate.

  In the laminate peeling container of the present invention, in the above configuration, the intermediate layer is preferably formed of nylon or ethylene vinyl alcohol copolymer resin.

  In the above-described configuration, the laminated peeling container of the present invention preferably has an average thickness of the intermediate layer in the body portion of 100 μm or less. The average thickness at the body portion of the intermediate layer is the average of the thickness of the intermediate layer at each position in the vertical direction of the body portion in a longitudinal section obtained by cutting the delamination container vertically along the axis of the mouth. It is a value.

  The laminate peeling container of the present invention has a three-layer structure in which the preform includes only a resin layer that forms the outer layer body, a resin layer that forms the inner layer body, and a resin layer that forms the intermediate layer in the above configuration. Preferably there is.

  According to the present invention, since the outer layer body and the inner layer body are formed of the same resin material, the resin layer that forms the outer layer body by co-injection molding, the resin layer that forms the inner layer body, and the intermediate layer are formed. When a preform formed in a multilayer structure including a resin layer is biaxially stretch blow molded to stretch the outer layer body, the inner layer body and the intermediate layer, the stretch amount is set so that both the outer layer body and the inner layer body are transparent. Since it can be set to an optimum stretching amount for this purpose, the transparency of the outer layer body and the inner layer body can be increased, and this delamination container can be formed transparently. By forming the delamination container transparently, it is easy to visually confirm the inside of the container. For example, the remaining amount of the content liquid contained in the delamination container and the state of the content liquid can be easily confirmed visually. Will be able to.

It is a front view of the lamination peeling container which is one embodiment of the present invention, and is a figure cut away and showing a part thereof. It is sectional drawing which expands and shows the lamination | stacking arrangement | positioning state of the outer layer body, inner layer body, and intermediate | middle layer which are shown in FIG. It is a figure which shows the thickness according to the distance from the neck bottom of the opening part of the outer layer body shown in FIG. 1, an inner layer body, and an intermediate | middle layer. It is a figure which shows the thickness according to the distance from the neck bottom of the mouth part of an outer layer body, an inner layer body, and an intermediate | middle layer in the comparative example with respect to this invention.

  Hereinafter, the present invention will be described in more detail with reference to the drawings.

  1 and 2 is an example of a delamination container, which is also called a delamination container, and has an outer layer body 2, an inner layer body 3, and an intermediate layer 4.

  The outer layer body 2 constitutes the outer shell of the delamination container 1, and is formed of a resin material in a cylindrical shape with a circular cross section, and a body portion 2b integrally connected to the lower portion of the mouth portion 2a. And formed into a bottle shape. In the present embodiment, the resin material forming the outer layer body 2 is polyethylene terephthalate (PET). The trunk | drum 2b has flexibility, and while being pressed (squeezed), it can dent and can restore | restore from the dent state to the original shape.

  The inner layer body 3 is formed in the shape of a bag thinner than the outer layer body 2 by the same resin material as the outer layer body 2, and is laminated on the inner surface of the outer layer body 2 so as to be peelable from the outer layer body 2. In the present embodiment, the resin material forming the inner layer body 3 is polyethylene terephthalate (PET), as with the outer layer body 2. Although not shown in detail, the opening of the inner layer body 3 is connected to the opening end of the mouth portion 2a of the outer layer body 2, and the inside of the inner layer body 3 is a housing portion 3a continuous to the opening. For example, cosmetics such as lotion, shampoos and rinses, liquid soaps, and liquids such as food seasonings can be stored in the container 3a.

  The intermediate layer 4 is formed of a resin material different from the resin material that forms the outer layer body 2 and the inner layer body 3, and is disposed between the outer layer body 2 and the inner layer body 3 at least on the inner surface of the body portion 2b. Yes. The intermediate layer 4 is preferably formed of a resin material having low compatibility with the resin material forming the outer layer body 2 or the inner layer body 3, and in this case, the outer layer body 2 or inner layer body of the resin material forming the intermediate layer 4 is used. 3 is compatible with the resin material that forms the intermediate layer 4 with respect to the outer layer body 2 and the inner layer body 3 even when a preform obtained by co-injection molding these resin materials is molded by biaxial stretch blow molding. To the extent that it can be peeled off.

  In the present embodiment, the resin material forming the intermediate layer 4 is nylon. By disposing the intermediate layer 4 made of nylon between the outer layer body 2 and the inner layer body 3 made of polyethylene terephthalate, the inner layer body 3 can be peeled and laminated on the outer layer body 2. . Further, since nylon has a high gas barrier property, the gas barrier property of the delamination container 1 can be enhanced by providing the nylon intermediate layer 4.

  In the present embodiment, the intermediate layer 4 is cut out (disappeared) in the vicinity of the center of the bottom of the outer layer body 2, and the outer layer body 2 and the inner layer body 3 formed of the same resin material in that portion Are bonded to each other to provide an adhesive portion between the outer layer body 2 and the inner layer body 3. By providing such an adhesive portion, it is possible to prevent the accommodating portion 3a of the inner layer body 3 from being irregularly reduced and deformed, and to stably deform and deform the accommodating portion 3a of the inner layer body 3. Thereby, the remaining amount of the content liquid can be reduced.

  Note that the adhesive portion has a configuration in which a part of the intermediate layer 4 disposed between the outer layer body 2 and the inner layer body 3 is cut out, and the outer layer body formed of the same resin material in the cutout portion. 2 and the inner layer body 3 are bonded to each other, and the housing portion 3a of the inner layer body 3 can be stably reduced and deformed. You can also. Further, the bonding portion can be formed in various shapes such as a shape extending in a band shape between the outer layer body 2 and the inner layer body 3.

  The delamination container 1 was formed in a three-layer structure including a polyethylene terephthalate resin layer forming the outer layer body 2, a polyethylene terephthalate resin layer forming the inner layer body 3, and a nylon resin layer forming the intermediate layer 4. The preform is formed into a predetermined shape by biaxial stretching blow molding using a blow molding apparatus. Blow molding equipment that performs biaxial stretch blow molding supplies blow preform molds, preform rods for longitudinal stretching of preforms, and media such as blow molding air and liquid to the preform. The thing provided with the supply apparatus which performs can be used. Further, as the preform having the three-layer structure used for the biaxial stretch blow molding, a preform formed by co-injection molding of the three-layer resin material is used.

  In the case shown in the drawing, a three-layered preform in which the resin layer forming the outer layer body 2 and the inner layer body 3 is polyethylene terephthalate and the resin layer forming the intermediate layer 4 is nylon is biaxially stretch blow molded. Thus, the delamination container 1 is configured as a so-called PET bottle having an internal volume of 500 ml.

  At this time, since the outer layer body 2 and the inner layer body 3 are formed of the same resin material, when the preform formed in the three-layer structure is biaxially stretch blow molded, the outer layer by the biaxial stretch blow molding is used. The stretching amount of the body 2, the inner layer body 3, and the intermediate layer 4 can be set to an optimum stretching amount for making both the outer layer body 2 and the inner layer body 3 transparent. Thereby, both the outer layer body 2 and the inner layer body 3 can be fully extended.

  As described above, in the delamination container 1 formed into a predetermined shape by biaxially stretching blow-molding the preform formed in a three-layer structure using a blow molding device, the outer layer body 2, the inner layer body 3 and The transparency of the intermediate layer 4 is enhanced by sufficiently stretching each resin layer in the biaxial stretch blow molding. Therefore, the lamination peeling container 1 can be formed transparently. Since the inside of the laminating / peeling container 1 formed in this way is easy to visually confirm the inside, for example, the remaining amount of the content liquid accommodated in the laminating / separating container 1, the state of the content liquid, etc. can be easily visually inspected. You will be able to confirm it.

  In particular, in the present embodiment, since polyethylene terephthalate having higher transparency than polypropylene or polyethylene is used as the resin layer for forming the outer layer body 2 and the inner layer body 3, the transparency of the delamination container 1 is further increased. be able to.

  Further, in the present embodiment, as shown in FIG. 2, the thickness t2 of the inner layer body 3 is made thinner than the thickness t1 of the outer layer body 2. Thereby, even if the outer layer body 2 and the inner layer body 3 are formed of the same resin material, while ensuring the squeeze of the outer layer body 2, that is, the deformation due to the pressing of the outer layer body 2 and the resilience from the deformation, Since the inner layer body 3 can be appropriately volume-reduced and deformed in accordance with the dispensing of the content liquid, the basic function as the delamination container 1 can be maintained.

  In particular, in the present embodiment, the thickness t1 of the outer layer body 2 is set so that the ratio (t1: t2) of the thickness t1 of the outer layer body 2 and the thickness t2 of the inner layer body 3 is in the range of 9: 1 to 3: 2. Since the thickness t2 of the inner layer body 3 is set, the basic function as the delamination container 1 can be more reliably maintained. That is, in the present embodiment, the thickness t1 of the outer layer body 2 is set to a thickness in the range of 1.5 to 9 times the thickness t2 of the inner layer body 3. Therefore, as shown in FIG. 3, the thickness t1 of the outer layer body 2 and the thickness t2 of the inner layer body 3 in the portion below the mouth portion 2a (under the neck), that is, the trunk portion 2b, are set at any position of the trunk portion 2b. The above relationship is satisfied.

  On the other hand, the thickness t3 of the intermediate layer 4 is preferably set to be thinner than the thickness t1 of the outer layer body 2 or the thickness t2 of the inner layer body 3, but in the present embodiment, in particular, the thickness t3 of the intermediate layer 4 is The trunk portion 2b is set so that the average thickness is 100 μm or less. In this way, by setting the thickness t3 of the intermediate layer 4 so that the average thickness in the body portion 2b is 100 μm or less, the intermediate layer 4 with respect to the outer layer body 2 without impairing the squeeze property. The peelability of the inner layer body 3 can be further enhanced.

  In addition, the average thickness in the trunk | drum 2b of the intermediate | middle layer 4 is the intermediate | middle layer in each position of the up-down direction of the trunk | drum 2b in the vertical cross section which cut | disconnected this lamination peeling container 1 along the axial center of the opening | mouth part 2a. It is the average value of the thickness of 4.

  As shown in FIG. 1, an opening 5 for introducing outside air is provided in a side portion (outer peripheral portion) of the mouth portion 2 a of the outer layer body 2 so as to penetrate the mouth portion 2 a inward and outward along the radial direction. The opening 5 for introducing outside air communicates between the outer layer body 2 and the intermediate layer 4, and can introduce outside air between the outer layer body 2 and the intermediate layer 4. Therefore, when the inner layer body 3 is peeled from the outer layer body 2, the inner layer body 3 is peeled from the outer layer body 2 together with the intermediate layer 4, and outside air is introduced between the outer layer body 2 and the intermediate layer 4.

  The opening 5 for introducing the outside air is not limited to the mouth portion 2a of the outer layer body 2, and may be provided in other parts of the outer layer body 2, such as the shoulder portion of the outer layer body 2 and the bottom portion of the trunk portion 2b. Further, the structure of the opening 5 for introducing the outside air is not limited to the structure formed by using a tool such as a drill, for example, and the outside air can be introduced between the outer layer body 2 and the inner layer body 3. If so, other configurations such as an annular cut formed by exposing a part of the inner layer body 3 to the outside of the outer layer body 2 can be used. In addition, when the opening 5 for introducing the outside air is configured as an annular cut formed by exposing a part of the inner layer body 3 to the outside of the outer layer body 2, the inner layer body 3 is peeled from the intermediate layer 4. It is also possible to adopt a configuration in which outside air is introduced between the inner layer body 3 and the intermediate layer 4.

  The mouth portion 2a of the outer layer body 2 is equipped with, for example, a pouring cap (not shown) in which a check valve is provided in the pouring cylinder, and the contents accommodated in the inner layer body 3 through the pouring cap. Liquid is poured out. The pouring cap has a function of preventing air from flowing into the housing portion 3a of the inner layer body 3 from the pouring cylinder after the content liquid is poured out by the check valve. The dispensing cap is screwed to the screw portion 2c provided in the mouth portion 2a and fixed to the mouth portion 2a, but is fixed to the mouth portion 2a by other means such as an undercut. You can also.

  When such a delamination container 1 is equipped with a pouring cap in which a check valve is provided in the pouring cylinder at the mouth 2a, the body 2b of the outer layer body 2 is pressed (squeezed). Thus, the content liquid accommodated in the accommodating portion 3a of the inner layer body 3 can be poured out from the mouth portion 2a. After the content liquid is poured out, the outer layer body 2 is restored to its original shape when the pressure on the body 2b is released. At this time, the space between the outer layer body 2 and the intermediate layer 4 from the opening 5 for introducing the outside air. The outside layer 2 can be restored to the original shape while reducing the volume of the accommodating portion 3a of the inner layer 3 by introducing outside air into the inside. Therefore, even if the content liquid is poured out, outside air does not flow from the mouth portion 2a to the inside of the accommodating portion 3a of the inner layer body 3, and thus the content of the content accommodated in the accommodating portion 3a is brought into contact with the air. Deterioration and alteration due to is suppressed.

  FIG. 4 is a view showing the thickness according to the distance from the bottom of the mouth of the outer layer body, the inner layer body, and the intermediate layer in the comparative example for the present invention.

  The basic structure of the delamination container of the comparative example is the same as that of the delamination container 1 of the present invention shown in FIG. 1, but the thickness t2 of the inner layer body is larger than the thickness t1 of the outer layer body as shown in FIG. It is different from the delamination container 1 of the present invention in that it includes a thickened portion. In this comparative example, the ratio (t1: t2) between the thickness t1 of the outer layer body and the thickness t2 of the inner layer body is about 1: 1 even in the portion where the thickness t1 of the outer layer body is thicker than the thickness t2 of the inner layer body. Therefore, it is not within the range of 9: 1 to 3: 2 as in the example of the present invention shown in FIG.

  In the configuration of such a comparative example, when the outer layer body and the inner layer body are formed of the same resin material, it is difficult to achieve both the squeeze property of the outer layer body and the appropriate volume reduction deformability of the inner layer body. For this reason, when the outer layer body is formed to a thickness that can be squeezed, the inner layer body is less likely to undergo volumetric deformation when the content liquid is poured out, and the basic function as a delamination container cannot be sufficiently obtained.

  On the other hand, in the delamination container 1 of the present invention, as shown in FIG. 3, the outer layer body 2 and the inner layer body 3 are reduced by reducing the thickness t2 of the inner layer body 3 relative to the thickness t1 of the outer layer body 2. Even in a configuration in which the outer layer body 2 is formed of the same resin material, the inner layer body 3 can be appropriately volume-reduced and deformed in accordance with the dispensing of the content liquid while ensuring the squeeze property of the outer layer body 2. As a basic function can be maintained.

  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 scope of the invention.

  For example, in the above-described embodiment, the outer layer body 2 and the inner layer body 3 are formed of polyethylene terephthalate. However, the present invention is not limited to this, and other resin materials such as polypropylene (PP) and polyethylene (PE) are used. It can also be formed.

  Moreover, in the said embodiment, although the intermediate | middle layer 4 is formed with nylon, it is not restricted to this, For example, other vinyl vinyl alcohol copolymer resin (EVOH), other polyglycolic acid resin (PGA), etc. It can also be formed of a resin material. These resin materials are also resin materials having low compatibility with polyethylene terephthalate and high gas barrier properties.

  Furthermore, in the above-described embodiment, a bilayer stretch blow molding is performed on a three-layered preform including only a resin layer that forms the outer layer body 2, a resin layer that forms the inner layer body 3, and a resin layer that forms the intermediate layer 4. By doing so, the delamination container 1 of the present invention is formed in a three-layer structure including three layers of the outer layer body 2, the inner layer body 3, and the intermediate layer 4. However, the present invention is not limited to this, and at least the outer layer body 2. If the three layers of the inner layer body 3 and the intermediate layer 4 are provided, the delamination container 1 of the present invention can also have a multilayer structure of three or more layers. For example, the delamination container 1 of the present invention has a four-layer structure including three layers of an outer layer body 2, an inner layer body 3, and an intermediate layer 4 and an adhesive layer between the inner layer body 3 and the intermediate layer 4. be able to. In this case, in addition to the resin layer forming the outer layer body 2, the resin layer forming the inner layer body 3, and the resin layer forming the intermediate layer 4, the resin layer forming the inner layer body 3 and the resin layer forming the intermediate layer 4 A four-layered laminate container 1 is formed by biaxially stretching blow-molding a four-layered preform provided with an adhesive layer therebetween. According to this configuration, since the inner layer body 3 is bonded to the intermediate layer 4 by the adhesive layer, the inner layer body 3 and the intermediate layer 4 are reliably integrated from the outer layer body 2 when the inner layer body 3 undergoes volume reduction deformation. Can be peeled off. Further, the delamination container 1 of the present invention has a pair of intermediate layers 4 disposed between the outer layer body 2 and the inner layer body 3, and the same resin as the outer layer body 2 and the inner layer body 3 between these intermediate layers 4. A five-layer structure in which an additional layer formed of a material is arranged can also be used. In this case, in addition to the resin layer that forms the outer layer body 2, the resin layer that forms the inner layer body 3, and the pair of resin layers that form the pair of intermediate layers 4, a pair of resin layers that form the pair of intermediate layers 4 A five-layer laminated release container 1 is formed by biaxially stretch-blowing a preform having a five-layer structure provided with a resin layer forming an additional layer therebetween. In this configuration, for example, the outer layer body 2, the inner layer body 3 and the additional layer are formed of polyethylene terephthalate, and the pair of intermediate layers is formed of nylon of two types, thereby forming two types of resin materials. The multilayer delamination container 1 can be configured at low cost.

DESCRIPTION OF SYMBOLS 1 Lamination peeling container 2 Outer layer body 2a Mouth part 2b Trunk part 2c Screw part 3 Inner layer body 3a Housing | casing part 4 Intermediate layer 5 Opening for external air introduction t1 Thickness of outer layer body t2 Thickness of inner layer body t3 Thickness of intermediate layer

Claims (5)

An outer layer body formed by a resin material in a shape including a cylindrical mouth portion and a body portion continuous to the mouth portion, and provided with an opening for introducing outside air;
An inner layer body that is formed thinner than the outer layer body by the same resin material as the outer layer body, and is laminated on the inner surface of the outer layer body so as to be peelable from the outer layer body;
The resin material forming the outer layer body and the inner layer body is formed of a different type of resin material, and has an intermediate layer disposed between the outer layer body and the inner layer body,
By biaxially stretching blow-molding a preform formed in a multilayer structure including a resin layer that forms the outer layer body by co-injection molding, a resin layer that forms the inner layer body, and a resin layer that forms the intermediate layer It is formed in a predetermined shape ,
Wherein the thickness of the outer layer body ratio of the inner layer having a thickness of 9: 1 to 3: delamination container, characterized in der Rukoto within 2 range.   The delamination container according to claim 1, wherein the outer layer body and the inner layer body are formed of polyethylene terephthalate. The delamination container according to claim 1 or 2 , wherein the intermediate layer is formed of nylon or ethylene vinyl alcohol copolymer resin. The delamination container according to any one of claims 1 to 3 , wherein an average thickness of the intermediate layer in the body portion is 100 µm or less. The preform according to any one of claims 1 to 4 , wherein the preform has a three-layer structure including only a resin layer that forms the outer layer body, a resin layer that forms the inner layer body, and a resin layer that forms the intermediate layer. 2. A delamination container according to 1.

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