JP6932448B2 - Laminated preform, container, manufacturing method of laminated preform, and manufacturing method of container - Google Patents

Description

The present invention relates to a laminated preform having a laminated structure having an intermediate layer inside, a container, a method for producing the laminated preform, and a method for producing a container formed from the laminated preform.

A synthetic resin container made of polyethylene terephthalate (hereinafter abbreviated as PET) resin or the like by biaxial stretching blow molding is used as a container for accommodating various contents such as beverages, foods, and cosmetics. Further, for example, in an application requiring gas barrier properties, an intermediate layer made of a resin having a gas barrier function such as a nylon resin or an ethylene vinyl alcohol copolymer resin is provided between an inner layer made of PET resin which is a main material resin and an outer layer. A synthetic resin container formed by blow-molding the laminated preforms arranged in a laminated manner is used.

Patent Document 1 describes a method for forming a laminated preform in which an intermediate layer having a gas barrier function is laminated between an inner layer and an outer layer, and a container formed by blow molding the laminated preform.

Such a laminated preform is formed by using an injection molding apparatus including a nozzle portion in which a flow path for a resin forming an inner layer and an outer layer and a flow path for a resin forming an intermediate layer are formed. can do.

Japanese Unexamined Patent Publication No. 2004-330672

However, as described above, in the laminated preform in which the intermediate layer is integrally formed with the outer layer and the inner layer by injection molding, the position of the edge portion (so-called leading edge) formed by the upper end of the intermediate layer is set around the circumference. It is difficult to align the height in a certain direction. Therefore, even in the container formed by using the laminated preform, it is difficult to align the upper end positions of the intermediate layers uniformly in the circumferential direction. Further, in the case of a laminated preform in which an intermediate layer is formed integrally with the outer layer and the inner layer by injection molding, for example, it is not possible to decorate the intermediate layer with a pattern, characters, etc. Therefore, when it is desired to decorate the container. After blow molding, it was necessary to attach a shrink label or the like to the outer surface of the container.

The present invention has been made in view of such a problem, and an object of the present invention is to stabilize the position of the intermediate layer in the laminated preform and to provide a laminated container capable of decorating the intermediate layer. It is to provide a method of manufacturing a reform, a container, a laminated preform, and a method of manufacturing a container.

The laminated preform of the present invention is a laminated preform for forming a container capable of containing the contents by blow molding.
A bottomed tubular outer layer with a mouth provided with a male thread,
A bottomed tubular inner layer that is detachably arranged inside the outer layer,
A film-like intermediate layer body that is detachably held at a predetermined position between the outer layer body and the inner layer body is provided .
The intermediate layer body is characterized in that it is composed of a plurality of layers.

In the laminated preform of the present invention, it is preferable that the intermediate layer body is composed of a decorative label.

Further, in the laminated preform of the present invention, the outer layer body has a mouth portion provided with a neck ring, a body portion, and a bottom portion.
The intermediate layer is preferably arranged below the neck ring.

In addition, the container of the present invention includes an outer layer, an inner layer, and an intermediate layer arranged between the outer layer and the inner layer.
The outer layer includes a mouth portion provided with a male screw portion.
The intermediate layer is characterized in that it is composed of a plurality of layers and is also composed of a decorated label.

The production how the laminated preform of the present invention, can accommodate container contents to a method for producing a laminated preform for forming blow molding,
A member molding process for molding a bottomed tubular outer layer body having a mouth portion provided with a male screw portion, a bottomed tubular inner layer body, and a film-shaped intermediate layer body, respectively.
See containing and a step of assembling assembling the inner layer body inside the outer layer body so that the in position intermediate layer member is disposed between said inner member and said outer layer member,
The intermediate layer is characterized in that it is composed of a plurality of layers .

Further, in the method for producing a laminated preform of the present invention, in the assembling step, after arranging the intermediate layer body along the inner surface of the outer layer body, the inner layer body is used as the outer layer body and the intermediate layer body. It can be inserted inside the layer.

Further, in the method for producing a laminated preform of the present invention, in the assembling step, after the intermediate layer body is arranged so as to be wound around the outer surface of the inner layer body, the intermediate layer body is placed inside the outer layer body. It is possible to insert the inner layer body around which the intermediate layer body is wound.

In addition, the method for manufacturing a container of the present invention includes a blow molding step of biaxially stretching blow molding the laminated preform described in any of the above using a mold.

According to the present invention, a laminated preform, a container, a method for manufacturing a laminated preform, and a container having a structure capable of stabilizing the position of the intermediate layer in the laminated preform and decorating the intermediate layer. A method can be provided.

It is a partial cross-sectional view of the laminated preform which concerns on one Embodiment of this invention. It is a figure which shows the assembly process in the manufacturing method of the laminated preform of FIG. It is a partial cross-sectional view of the container which concerns on one Embodiment of this invention. It is a partial cross-sectional view of the laminated preform which concerns on other embodiment of this invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings. As shown in FIG. 1, the laminated preform 1 according to the embodiment of the present invention is formed by assembling an outer layer body 2, an inner layer body 3, and an intermediate layer body 4, which are separately molded. be.

The outer layer body 2 has a bottomed tubular shape like a test tube, and has a cylindrical mouth portion 21 having an upper end opening 21a, a cylindrical body portion 22 connected below the mouth portion 21, and a body portion 22. It is composed of a hemispherical shell-shaped bottom portion 23 that closes the lower end of the. The mouth portion 21 is provided with an annular neck ring 21b and a male screw portion 21c provided above the neck ring 21b.

The outer layer body 2 is formed by injection molding (injection molding) in which the molten resin is injected into a mold having a cavity mold forming the outer surface of the outer layer body 2 and a core mold forming the inner surface of the outer layer body 2. be able to. Alternatively, the outer layer 2 is extruded blow molded (EBM:) in which a tubular molten parison extruded from an extruder is sandwiched between molds and a pressurized gas is blown into the outer layer 2 to form a shape along the inner surface of the mold. It may be formed by Extrusion Blow Molding). The outer layer body 2 can be formed of, for example, PET resin, but is not limited thereto. Although the outer layer 2 has a single-layer structure in this example, it may have a multi-layer structure composed of a plurality of layers.

The inner layer body 3 is detachably arranged inside the outer layer body 2. The outer surface shape of the inner layer 3 basically corresponds to the inner surface shape of the outer layer 2, and the intermediate layer 4 can be held between the outer layer 2 and the outer layer 2 without any gap. ing. The inner layer 3 of this example has a cylindrical mouth portion 31 having an upper end opening 31a, a cylindrical body portion 32 connected below the mouth portion 31, and a hemispherical shell-shaped bottom portion 33 that closes the lower end of the body portion 32. It is composed of and. The inner layer body 3 can be formed by injection molding, extrusion blow molding (EBM), or the like, similarly to the outer layer body 2. The inner layer body 3 can be formed of, for example, PET resin, but is not limited to this, and may be formed of the same material as the outer layer body 2 or may be formed of a material different from that of the outer layer body 2. good. Further, the inner layer body 3 may have a single-layer structure or a multi-layer structure composed of a plurality of layers.

The intermediate layer body 4 is a film-like member. The intermediate layer body 4 can be elastically deformed into a shape along the outer surface of the inner layer body 3 and the inner surface of the outer layer body 2. Alternatively, the intermediate layer 4 may be formed in advance as a three-dimensional shape along the outer surface of the inner layer 3 and the inner surface of the outer layer 2. In the assembled state shown in FIG. 1, the intermediate layer body 4 is held in a state of being detachably adhered to the inner surface of the outer layer body 2 and the outer surface of the inner layer body 3. In this state, the upper end 4a and the lower end 4b of the intermediate layer 4 extend straight in the circumferential direction. By changing the shape and arrangement position of the intermediate layer 4, the extending directions of the upper end 4a and the lower end 4b can also be changed. For example, the upper end 4a and the lower end 4b of the intermediate layer 4 may be curved so as to undulate in the circumferential direction, or may be inclined in a certain direction. The material, shape, and structure of the intermediate layer 4 are not particularly limited as long as they can be arranged along the inner surface of the outer layer 2 and the outer surface of the inner layer 3. Further, the intermediate layer body 4 may have a single-layer structure or a multi-layer structure composed of a plurality of layers.

For the intermediate layer 4, for example, PS (polystyrene), PET (polyethylene terephthalate), PP (polypropylene), PE (polyethylene) can be used. In addition, resins and polyolefins having gas barrier properties such as EVOH (ethylene vinyl alcohol copolymer resin), MXD6 (methoxylenidamine-based polyamide), MXD6 + fatty salt, PGA (polyglycolic acid), PEN (polyethylene naphthalate), etc. For example, a resin having a moisture barrier property such as PE (polyethylene), PP (polypropylene), COC, COP (cyclic polyolefin) can also be used. According to this, the gas barrier property and the moisture barrier property of the container 10 (see FIG. 3) formed by blow molding the laminated preform 1 can be enhanced.

Further, the intermediate layer 4 is preferably made of a thermoplastic resin, which can improve stretchability (stretch followability) when the laminated preform is heated and stretched.

Further, by adding an additive to the intermediate layer 4, it is possible to enhance a specific function such as an ultraviolet ray blocking effect by adding an ultraviolet ray absorber, for example.

Further, the intermediate layer 4 can be made of a urethane resin, which can enhance the dew condensation prevention effect and the heat retention function of the container.

The method for forming the intermediate layer 4 is, for example, a sheet or film formed by a method such as extrusion, casting, stretching (uniaxial or biaxial), inflation, or the like.

Further, the intermediate layer 4 is a decorative label decorated with a pattern, characters, or the like, and in this case, the outer layer 2 is made of a transparent or translucent material. According to this, a decorative label (intermediate layer 18) having the decorative property can be provided inside the container 10 (between the outer layer 16 and the inner layer 17) formed by blow molding the laminated preform 1. The decorativeness of the container 10 can be easily enhanced. Further, it is not necessary to provide a shrink film or the like decorated with a pattern, characters, or the like in a post-process on the outside of the container 10 formed by blow molding using the laminated preform 1. Further, when a shrink film or the like is provided on the outside of the container, the film may be damaged or torn due to contact with the outside. However, by providing the decorative label inside, such a decorative label is damaged. Can be prevented. It is also possible to impart various functions to the intermediate layer 4 such as attaching a two-dimensional color code, RFID, or the like to provide an anti-counterfeiting function while using the intermediate layer 4 as a decorative label.

The method for manufacturing the laminated preform 1 includes a member molding step for molding the outer layer 2, the inner layer 3, and the intermediate layer 4, respectively, and an assembly step for assembling the outer layer 2, the inner layer 3, and the intermediate layer 4. ,including. In the member molding step, the outer layer body 2, the inner layer body 3, and the intermediate layer body 4 are separately formed by the above-mentioned method or the like. The method of forming each of the outer layer 2, the inner layer 3, and the intermediate layer 4 is not particularly limited.

In the assembling step, for example, as shown in FIG. 2, after arranging the intermediate layer 4 along the inner surface of the outer layer 2, the inner layer 3 is placed inside the outer layer 2 and the intermediate layer 4 from above. Is placed so as to be inserted. Alternatively, it is also possible to assemble the intermediate layer body 4 arranged so as to be wound around the outer surface of the inner layer body 3 so as to be inserted inside the outer layer body 2. The intermediate layer 4 thus arranged between the outer layer 2 and the inner layer 3 is held in a state of being detachably adhered to the inner surface of the outer layer 2 and the outer surface of the inner layer 3.

Here, in order to ensure that the intermediate layer 4 is arranged at a predetermined position and to prevent the intermediate layer 4 from being displaced, the intermediate layer 4 is intermediate between at least one of the inner surface of the outer layer 2 and the outer surface of the inner layer 3. It is preferable that a recess corresponding to the shape of the layer 4 is formed. By arranging the intermediate layer body 4 so as to be fitted in the recess, it is possible to more reliably prevent the intermediate layer body 4 from being displaced with respect to the outer layer body 2 and the inner layer body 3.

The container 10 shown in FIG. 3 is a synthetic resin container formed through a blow molding step using the laminated preform 1. That is, the method for manufacturing the container 10 includes a blow molding step of biaxial stretching blow molding using the laminated preform 1.

The blow molding step can be performed using a mold for blow molding, a blow molding apparatus, or the like. For example, the laminated preform 1 is heated to a temperature at which the stretching effect can be exhibited by using a heating device such as a heater, and the heated laminated preform 1 is placed at a predetermined position of a mold for blow molding. .. Next, the laminated preform 1 is stretched in the vertical direction (direction along the central axis of the laminated preform 1) by the stretching rod of the blow forming apparatus, and the inside of the laminated preform 1 (from the nozzles applied to the mouths 21 and 31) ( The pressurized fluid injected into the inner layer 3) is mainly stretched in the lateral direction (direction orthogonal to the central axis of the laminated preform 1). As a result, the laminated preform 1 can be expanded and deformed into a shape along the cavity of the mold to form a container 10 having a desired shape.

A gas or liquid is used as the pressurized fluid. When using a liquid, for example, in a container for beverages, by using water, tea, refreshing drinking water, etc. filled in the container, and in a container for toiletries, by using cosmetics, shampoo, conditioner, etc. Since the filling step can be omitted, the production line can be simplified.

As shown in FIG. 3, for example, in the container 10 of the present embodiment, the body portions 22, 32 and bottom portions 23, 33 of the laminated preform 1 are stretched, while the mouth portions 21, 31 are blow-molded so as not to be stretched. Is. The container 10 has a bottom portion 13 in which the central portion is recessed toward the inside of the container 10 and a plurality of bulging legs are provided on the peripheral portion, and a cylindrical body portion connected to the bottom portion 13 and having a reduced diameter at the upper portion. A 12 and a mouth portion 11 which is open at the upper portion of the body portion 12 and has a neck ring 14 and a male screw portion 15. A cap or the like having a female threaded portion corresponding to the male threaded portion 15 can be screwed onto the mouth portion 11. The shapes of the body portion 12 and the bottom portion 13 of the container 10 are not limited to the illustrated examples, and can be changed as appropriate.

Further, the container 10 includes an outer layer 16 formed from the outer layer 2 of the laminated preform 1, an inner layer 17 formed from the inner layer 3, and an intermediate layer 18 formed from the intermediate layer 4. The inside of the inner layer 17 is a storage space S capable of accommodating the contents. The intermediate layer 18 is arranged over the entire circumference of the body portion 12 or a part in the circumferential direction. Further, the intermediate layer 18 is arranged in a predetermined axial direction (height direction) arrangement range R from the upper end 18a to the lower end 18b.

In the present embodiment, the intermediate layer 4 is held in a state of being releasably adhered to the inner surface of the outer layer 2 and the outer surface of the inner layer 3, so that the intermediate layer 18 is held after the container 10 is used. Can be separated from the outer layer 16 and the inner layer 17 and easily separated and discarded or reused (recycled). When removing the intermediate layer 18, the intermediate layer 18 can be removed by contracting the inner layer 17 and pulling out the inner layer 17 and the intermediate layer 18 from the outer layer 16. Alternatively, the intermediate layer 18 may be peeled off from the outer surface of the inner layer 17 in a state where the outer layer 16 is cut and opened.

Even in the container 10 after blow molding, it is preferable that the intermediate layer 18 is detachably adhered to the outer layer 16 and the inner layer 17, and according to this, the intermediate layer 18 is peeled off from the outer layer 16 and the inner layer 17 after use. Can be easily sorted and disposed of or reused.

The laminated preform 1 of the present embodiment is formed by assembling an outer layer body 2, an inner layer body 3, and an intermediate layer body 4, which are separately molded. With such a configuration, the intermediate layer body 4 can be arranged at a desired position with higher accuracy than in the case where the intermediate layer is integrally formed with the outer layer and the inner layer by injection molding. Further, since the intermediate layer 4 is individually molded, the shape of the intermediate layer 4 itself can be accurately molded into a desired shape. As described above, according to the laminated preform 1 of the present embodiment, the shape of the intermediate layer body 4 is stable, and the intermediate layer body 4 can be easily arranged at a desired position. As a result, even in the container 10 formed by blow molding the laminated preform 1, the position of the intermediate layer 18 can be easily arranged at a desired position with high accuracy.

When the intermediate layer 4 is used as a decorative label, the appearance performance of the container 10 can be improved, and the decorative label (intermediate layer 18) is less likely to be damaged by contact with the outside. Further, when the intermediate layer 4 is provided with a predetermined function such as a gas barrier function, it is possible to prevent the intermediate layer 4 from being deteriorated due to the unstable position of the intermediate layer 4. Therefore, according to the container 10 formed by using the laminated preform 1 of the present embodiment, the intended function can be more reliably exhibited.

Further, in the present embodiment, when the laminated preform 1 is formed, the intermediate layer body 4 is formed separately from the outer layer body 2 and the inner layer body 3, so that the intermediate layer body 4 having an arbitrary shape is formed. Can be done. For example, the outer shape of the intermediate layer 4 may be a decorative shape. Alternatively, the intermediate layer 4 is formed larger than the illustrated example so as to cover the entire lower portion of the mouth portions 21 and 31 in the laminated preform 1, and is formed from the bottom portion 13 (heel portion) of the container 10 after blow molding. A wide range may be covered up to the upper end of the body portion 12 (near the lower end of the neck ring 14).

In the laminated preform 1 shown in FIG. 1, the mouth portion 21 of the outer layer body 2 and the mouth portion 31 of the inner layer body 3 form a double-structured mouth portion, as shown in FIG. In addition, the mouth portion of the laminated preform 1'may be composed of only the mouth portion 31 of the inner layer body 3', and the outer layer body 2'may be assembled below the mouth portion 31. Specifically, in the example of FIG. 4, the outer layer body 2'having the body portion 22 and the bottom portion 23 is arranged below the neck ring 31b provided at the mouth portion 31 of the inner layer body 3'. The mouth portion 31 of the inner layer body 3'shown in FIG. 4 is provided with a male screw portion 31c above the neck ring 31b.

In the container (not shown) formed by blow molding the laminated preform 1'in FIG. 4, since the mouth portion is composed of only the inner layer, for example, after using the container, the inner layer is shrunk to shrink the outer layer. When pulling out from, the mouth can be gripped and easily pulled out. As a result, the intermediate layer can also be easily taken out from the outer layer. That is, since the outer layer, the inner layer, and the intermediate layer can be easily separated after the container is used, it is easy to separate each material at the time of disposal or recycling.

It goes without saying that the present invention is not limited to the above-described embodiment and can be variously modified without departing from the gist thereof. For example, the mouth portion 11 has a male screw portion 15, and a cap or the like having a female screw portion corresponding to the male screw portion 15 can be screwed, but the present invention is not limited to this, and for example, the mouth portion 11 is undercut. A protrusion for engagement may be provided, and the cap may be attached by tapping or the like. Further, the shapes of the body portion 12 and the bottom portion 13 of the container 10 are not limited to the illustrated examples, and can be changed as appropriate. Further, the intermediate layer 4 may be formed by dividing it into a plurality of members and arranged at predetermined positions between the outer layer 2 and the inner layer 3.

1, 1': Laminated preform 2, 2': Outer layer 3, 3': Inner layer 4: Intermediate layer 4a: Upper end 4b: Lower end 10: Container 11: Mouth 12: Body 13: Bottom 14: Neck Ring 15: Male thread 16: Outer layer 17: Inner layer 18: Intermediate layer 18a: Upper end of intermediate layer 18b: Lower end of intermediate layer 21: Mouth 21a: Upper end opening 21b: Neck ring 21c: Male thread 22: Body 23: Bottom 31: Mouth 31a: Upper end opening 31b: Neck ring 31c: Male thread 32: Body 33: Bottom R: Intermediate layer arrangement range S: Accommodation space

Claims (8)

A laminated preform for forming a container capable of containing the contents by blow molding.
A bottomed tubular outer layer with a mouth provided with a male thread,
A bottomed tubular inner layer that is detachably arranged inside the outer layer,
A film-like intermediate layer body that is detachably held at a predetermined position between the outer layer body and the inner layer body is provided .
A laminated preform characterized in that the intermediate layer body is composed of a plurality of layers. The laminated preform according to claim 1, wherein the intermediate layer body is composed of a decorative label. The outer layer body has the mouth portion provided with a neck ring, a body portion, and a bottom portion.
The laminated preform according to claim 1 or 2 , wherein the intermediate layer body is arranged below the neck ring. It comprises an outer layer, an inner layer, and an intermediate layer arranged between the outer layer and the inner layer.
The outer layer includes a mouth portion provided with a male screw portion.
A container in which the intermediate layer is composed of a plurality of layers and is composed of a decorated label. A method for producing a laminated preform for forming a container capable of containing contents by blow molding.
A member molding process for molding a bottomed tubular outer layer body having a mouth portion provided with a male screw portion, a bottomed tubular inner layer body, and a film-shaped intermediate layer body, respectively.
See containing and a step of assembling assembling the inner layer body inside the outer layer body so that the in position intermediate layer member is disposed between said inner member and said outer layer member,
A method for producing a laminated preform, which uses a layer composed of a plurality of layers as the intermediate layer. The laminated product according to claim 5 , wherein in the assembling step, after the intermediate layer body is arranged along the inner surface of the outer layer body, the inner layer body is inserted into the outer layer body and the inside of the intermediate layer body. Remodeling manufacturing method. In the assembling step, after placing in the wound around the intermediate layer body on an outer surface of the inner layer member, inside the outer body, inserting the inner layer body wrapped with the intermediate layer body according to claim 5 The method for producing a laminated preform according to. A method for manufacturing a container, which comprises a blow molding step of biaxially stretching blow molding the laminated preform according to any one of claims 1 to 3. using a mold.

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