JP2019069808A - Composite container and production method thereof, and metal mold used in production method of composite container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plastic container having an appearance capable of giving an expensive impression. The composite container of the present invention is provided with a mouth portion, a neck portion provided below the mouth portion, and a neck portion below the neck portion. The container body includes a shoulder portion, a body portion provided below the shoulder portion, a bottom portion provided below the body portion, and a plastic member provided in close contact with the outside of the container body. The plastic member is a blow-molded product that is inflated as a unit, and the plastic member has a rubbed glass-like surface due to having fine irregularities having a height (depth) of 1 μm or more and 200 μm or less. It is characterized by being. [Selection diagram] Fig. 1

Description

  The present invention relates to a composite container, a method of manufacturing the same, and a mold used for the method of manufacturing the composite container.

  Recently, plastic containers have become common as containers for containing content liquid, and such plastic containers contain the content liquid.

  A plastic container containing such a content liquid is manufactured by inserting a preform into a mold and biaxially stretching blow molding.

  By the way, in the conventional biaxial stretch blow molding method, for example, a preform including a single layer material such as PET or PP, a multilayer material, a blend material or the like is used to be formed into a container shape. However, in the conventional biaxial stretch blow molding method, it is general to merely mold the preform into a container shape. For this reason, when giving a container various functions and characteristics (barrier property, heat retention property, etc.), the means, such as changing the material which comprises a preform, will be limited. Among other things, it is difficult to have different functions or characteristics depending on the location of the container (for example, the body or the bottom).

  The applicant has proposed a composite container comprising a container body and a plastic member capable of giving various functions and characteristics to the container in the previous application (Japanese Patent Laid-Open No. 2015-128858). doing.

JP, 2015-128858, A

Examples of the contents include alcoholic beverages such as sake, brandy and whiskey.
Although these are usually accommodated in a glass container, plastic containers have been used in recent years for the purpose of suppressing transportation costs and the like.
However, compared with the product accommodated in the glass container, the product accommodated in the plastic container tends to give a cheap impression from the appearance, and there was room for improvement.

  Therefore, the problem to be solved by the present invention is to provide a plastic container having an appearance that can give an expensive impression.

  The composite container of the present invention comprises the mouth, a neck provided below the mouth, a shoulder provided below the neck, a body provided below the shoulder, and a body provided below the body. A container body comprising a bottom portion, and a plastic member closely attached to the outside of the container body, wherein the container body and the plastic member are blow molded articles integrally expanded, and the plastic member is high It is characterized in that it has a rubbed glass surface by having fine irregularities of 1 μm to 200 μm in depth (depth).

  In the above-mentioned mode, it is preferred that fine unevenness forms a character and / or a pattern.

  In the above aspect, it is preferable that the plastic member has a three-dimensional pattern formed by convex portions having a height of 250 μm or more and 1000 μm or less and / or concave portions having a depth of 250 μm or more and 1000 μm or less.

  In the above aspect, it is preferable that the melting point of the resin material which is the main constituent component of the container main body be higher than the melting point of the resin material which is the main constituent component of the plastic member.

  In the above aspect, the melting point of the resin material which is the main component of the plastic member is preferably 50 ° C. or more and 120 ° C. or less.

  In the above aspect, it is preferable that the resin material which is the main component of the plastic member is a polyolefin resin.

  In the above aspect, the difference between the melting point of the resin material which is the main component contained in the container body and the melting point of the resin material which is the main component contained in the plastic member is 30 ° C. or more and 210 ° C. or less Is preferred.

  The method of manufacturing a composite container according to the present invention comprises the steps of preparing a composite preform comprising a preform and a plastic member provided so as to surround the outside of the preform, and blow molding the composite preform in a mold. And a step of

  The mold of the present invention is a mold used for the method of manufacturing a composite container, characterized in that the inner surface thereof has fine irregularities having a height (depth) of 1 μm or more and 200 μm or less. .

In the above aspect, the inner surface is provided with a ridge and / or a ridge corresponding to the ridge and / or the ridge formed on the surface of the plastic member of the composite container.
The height (depth) of the grooves and / or ridges of the mold is greater than the height (depth) of the ridges and / or grooves formed on the surface of the plastic member Is preferred.

In the above embodiment, the height (depth) (A) of the concave and / or convex ridges of the mold and the convex and / or concave ridges formed on the surface of the plastic member It is preferable that the height (depth) (B) satisfy the following relationship.
A ≧ B × 1.2

  The composite container according to the present invention is provided with a plastic member having a fine uneven surface and a rubbed glass surface, so that the high-class appearance of the composite container can be improved. Moreover, it has a three-dimensional pattern which consists of a convex streak part and / or a concave streak part, and, thereby, a brand name etc. can be represented and the high-class feeling of a composite container can be improved further.

FIG. 1 is a partial vertical cross-sectional view of a composite container 10A of the present invention. FIG. 2 is a partial vertical cross-sectional view of the composite preform 70 of the present invention. Fig.3 (a)-(c) is a perspective view which shows the various plastic members 40a. FIG. 4 is a diagram showing the shape of the thermally compressed margin portion. FIG. 5 is a schematic view showing an embodiment of a method for producing the plastic member 40a. FIG. 6 is a schematic view showing an embodiment of a method for producing the plastic member 40a. FIG. 7 is a vertical sectional view showing a state in which the preform 10a is fitted into the plastic member 40a. FIG. 8 is a schematic view showing an embodiment of a method of producing the composite container 10A. FIG. 9 is a front view showing an embodiment of the body mold 50a.

Composite container 10A
As shown in FIG. 1, the composite container 10A is a blow-molded product of a composite preform 70, and includes a container body 10 located inside and a plastic member 40 provided in close contact with the outside of the container body 10. Have.

Container body 10
The container body 10 includes a mouth 11, a neck 13 provided below the mouth 11, a shoulder 12 provided below the neck 13, a body 20 provided below the shoulder 12, and a body 20 and a bottom 30 provided below.
In the present specification, the terms "upper" and "lower" refer to the upper side and the lower side, respectively, in a state where the composite container 10A is erected (FIG. 1).

The mouth portion 11 has a screw portion 14 screwed to a cap (not shown) and a flange portion 17 provided below the screw portion 14.
The shape of the mouth 11 may be a conventionally known shape.

  The neck portion 13 is located between the flange portion 17 and the shoulder portion 12 and has a substantially cylindrical shape with a substantially uniform diameter. The shoulder portion 12 is located between the neck portion 13 and the body portion 20, and has a shape in which the diameter gradually increases from the neck portion 13 side to the body portion 20 side.

  Furthermore, the body portion 20 has a cylindrical shape having a substantially uniform diameter as a whole. However, the present invention is not limited to this, and the body portion 20 may have a polygonal cylindrical shape such as a rectangular cylindrical shape or an octagonal cylindrical shape. Alternatively, the body portion 20 may have a cylindrical shape having a non-uniform horizontal cross section from the upper side to the lower side. Further, in the present embodiment, the body portion 20 is not provided with a panel or a groove and has a substantially flat surface, but the present invention is not limited to this. For example, a panel or a groove may be formed in the body portion 20.

  The bottom portion 30 has a recess 31 located at the center and a ground portion 32 provided around the recess 31. The shape of the bottom 30 is not particularly limited either, and may have a conventionally known bottom shape (for example, a petaloid bottom shape, a round bottom shape, etc.).

The container body 10 can be made of a resin material such as polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, ionomer resin, or a blend of these.
Among the above-mentioned resin materials, polyethylene terephthalate is preferable from the viewpoint of moldability and recyclability.

  Also, the container body 10 may contain a colorant such as red, blue, yellow, green, brown, black, white, etc., but considering the ease of recycling, it does not contain these colorants and is colorless. It is preferably transparent.

Moreover, the thickness of the container body 10 in the trunk portion 20 is not limited to this, but for example, when the internal volume of the container body 10 is 500 mL and the weight of the container body 10 is 20 g, 50 μm to It can be about 250 μm.
Moreover, when the internal volume of the container main body 10 is 500 mL and the weight of the container main body 10 is 35 g, it can be about 100 micrometers-500 micrometers. By reducing the thickness of the container body 10 as described above, the weight of the container body 10 can be reduced.

  In one embodiment, the container body 10 can be produced by biaxial stretch blow molding a preform 10a described later.

  In order to enhance the barrier property of the container, a vapor deposition film such as a diamond-like carbon film or a silicon oxide thin film may be formed on the inner surface of the container body 10, for example.

  The container body 10 may be, for example, a bottle with a full filling volume of 100 mL to 2000 mL. Alternatively, the container body 10 may be a large-sized bottle with a full filling volume of, for example, 10 L to 60 L.

Plastic members 40
The plastic member 40 is in close contact with the outer surface of the container body 10 in a thinly extended state, and is attached to the container body 10 so as not to move or rotate easily. Further, as shown in FIGS. 1 and 2, the plastic member 40 is provided over the entire circumferential direction so as to surround the container body 10, and has a substantially circular horizontal cross section.

  The plastic member 40 is provided so that the plastic member 40a surrounds the outside of the preform 10a as described later, and after close contact with the outside of the preform 10a, the preform 10a and the plastic member 40a are integrated, It can be obtained by biaxial stretching co-blow molding.

  As shown in FIG. 1, the plastic member 40 can be provided so as to cover the shoulder 12, the body 20 and the bottom 30 except for the mouth 11 and the neck 13 in the container body 10. With such a configuration, desired functions and characteristics can be imparted to the shoulder 12, the body 20 and the bottom 30 of the container body 10.

  In addition, the plastic member 40 may be provided in the entire area or a partial area of the container body 10 other than the opening 11. For example, the plastic member 40 may be provided so as to cover the whole of the neck portion 13, the shoulder portion 12, the body portion 20 and the bottom portion 30 of the container body 10 excluding the mouth portion 11. Furthermore, the number of plastic members 40 is not limited to one, and a plurality of members may be provided. For example, two plastic members 40 may be provided on the outer surface of the shoulder 12 and the outer surface of the bottom 30, respectively.

The plastic member 40 is characterized in that it has fine irregularities 43 with a height (depth) of 1 μm or more and 200 μm or less on its outer surface (see FIG. 1).
By the plastic member 40 having such fine irregularities, the outer surface thereof becomes a rubbed glass-like, and the luxury appearance of the appearance of the composite container 10A can be improved.
The height (depth) of the unevenness 43 can be 1 μm or more and 100 μm or less, and can be 1 μm or more and 80 μm or less.
The unevenness 43 may be provided on a part or the whole of the plastic member 40. For example, the unevenness 43 may be provided on the whole except a ridge portion and a concave portion described later.
In one embodiment, the asperities 43 may be provided on a part of the plastic member 40 to form characters, patterns, and the like.

In one embodiment, the plastic member 40 further has a convex portion 44 with a height of 250 μm or more and 1000 μm or less and / or a concave portion (not shown) with a depth of 250 μm or more and 1000 μm or less. A three-dimensional pattern is formed (see FIG. 1).
Three-dimensional patterns include various things, including various characters, patterns of flowers, patterns of animal patterns, lines, dots, geometric shapes, patterns of figures, etc., and character information including Braille. Etc. are included.
The three-dimensional pattern may have the above-described unevenness 43 formed on the surface thereof, and may be a rubbed glass-like surface, or may not have the unevenness 43 formed.
By forming such a three-dimensional pattern on the surface of the plastic member 40, the luxury appearance of the appearance of the composite container 10A can be further improved.

The plastic member 40 may or may not have contraction with respect to the container body 10, but from the viewpoint of adhesion to the container body 10, it has contraction. Is preferred.
Further, as the shrinkable plastic member 40, for example, one that shrinks (eg, heat shrinks) with respect to the container body 10 may be used when an external action (eg, heat) is applied. Alternatively, the plastic member 40 may itself be shrinkable or elastic and can be shrunk without any external action.

The plastic member 40 preferably contains, as a main component, a resin material lower than the melting point of the resin material which is the main component contained in the container body 10.
As the plastic member 40 contains such a resin material as a main component, it is possible to surprisingly form extremely fine irregularities 43 on the surface of the plastic member 40, and to design various designs. Can be expressed.
In the present invention, “the resin material which is the main component” refers to the resin material having the largest content among the resin materials contained in the container body 10 or the plastic member 40.
The difference between the melting point of the resin material as the main component contained in the container body 10 and the melting point of the resin material as the main component contained in the plastic member 40 is preferably 30 ° C. or more and 210 ° C. or less The temperature is more preferably 50 ° C. or more and 200 ° C. or less, and still more preferably 100 ° C. or more and 180 ° C. or less.

  The melting point of the resin material which is the main component contained in the plastic member 40 is preferably 50 ° C. or more and 120 ° C. or less, and more preferably 65 ° C. or more and 100 ° C. or less. By setting the melting point of the resin material in the above numerical range, it is possible to form finer irregularities on the surface of the plastic member 40.

The resin material contained as a main component in the plastic member 40 includes polyolefin resins such as polyethylene, polypropylene, polybutylene and polymethylpentene, polyester resins such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, and polyvinyl chloride And vinyl resins, and (meth) acrylic resins such as polyacrylates, polymethacrylates and polymethylmethacrylates.
Among the above-described resin materials, polyolefin resins are more preferable, and polyethylene is particularly preferable, because finer irregularities can be formed on the surface of the plastic member 40 after blow molding.

  The plastic member 40 can contain the above-described resin material as a main constituent component. In addition to the resin materials described above, poly-4-methylpentene-1, polystyrene, AS resin, ABS resin, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, diallyl phthalate, as long as the characteristics of the present invention are not impaired. Resin, fluorocarbon resin, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, ethylene propylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluororubber, nylon 6, nylon 6, 6, MXD6, aromatic polyamide, polycarbonate, ethylene polyterephthalate, butylene polyterephthalate, ethylene polynaphthaleneate, U polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polymer Resin materials such as ether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, polyether sulfone, silicone resin, polyurethane, phenol resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, epoxy resin, ionomer resin Can be included.

The plastic member 40 can contain a colorant.
As a coloring agent, brown, black, green, white, yellow, red, or blue etc. can be mentioned, You may use individually or may use 2 or more together.
In the present specification, for example, the plastic member 40 colored in "brown" is a brown, transparent plastic member 40, an opaque plastic member 40 and a translucent plastic member 40. All of which are included.
The plastic member 40a contains a coloring agent and is colored in a predetermined color so that visible light in a desired wavelength range can be cut (absorbed or reflected), and the composite container 10A is filled with the visible light. It is possible to prevent the problem that the content liquid is denatured.
For example, when the contents required to cut visible light having a wavelength of 400 to 500 nm are filled, the visible light having a wavelength of 400 to 500 nm may be cut by coloring the entire plastic member 40a in brown. It is possible to prevent the degeneration of the contents.
In the present invention, visible light refers to light having a wavelength of 380 nm to 800 nm.
The colorant may be a pigment or a dye, but is preferably a pigment from the viewpoint of light resistance.
Furthermore, in one embodiment, among the pigments, light reflective pigments and light absorbing pigments are preferable. Examples of light reflective pigments include white pigments such as titanium white, aluminum powder, mica powder, zinc sulfide, zinc flower, calcium carbonate, kaolin and talc, and examples of light absorbing pigments include carbon black and ceramic black A colored pigment is mentioned. By using such a pigment, visible light of a wider wavelength can be cut.
When the plastic member 40a contains a light-reflecting colorant and / or a light-absorbing colorant, visible light in a wider wavelength range can be cut, and modification of the content filled in the composite container 10A Can be prevented. In the case where the plastic member 40a is composed of multiple layers, the layer containing the colorant may be two or more.

  The content of the coloring agent is preferably 0.01 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the resin material contained in the plastic member 40, 0.1 parts by mass or more, and 3.0 It is more preferable that it is a mass part or less, and it is further more preferable that it is 0.5 mass part or more and 2.0 mass parts or less.

  The plastic member 40 can also contain various additives as long as the characteristics thereof are not impaired. Additives include, for example, plasticizers, UV absorbers, color inhibitors, matting agents, deodorants, flame retardants, weathering agents, antistatic agents, yarn friction reducing agents, slip agents, mold release agents, antioxidants Agents, ion exchange agents, and color pigments can be added. In addition, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, a foam member having a foam cell diameter of 0.5 to 100 μm is used, and the foam preform is molded. , Can improve the light shielding property.

Furthermore, the plastic member 40 may be designed or printed. In this case, it is possible to display an image or characters on the composite container 10A without separately applying a label or the like to the container body 10 after blow molding.
For example, the plastic member 40 may be provided on all or part of the body portion 20 of the container body 10, and an image or characters may be displayed on the body portion 20.
The printing can be performed by, for example, a printing method such as an inkjet method, a gravure printing method, an offset printing method, a flexographic printing method, a thermal transfer method, or a hot stamp method.
For example, in the case of using the inkjet method, a UV curable ink is applied to the plastic member 40a (40), UV irradiation is performed on the UV curable ink, and the printing layer can be formed by curing. This printing may be applied to the plastic member 40a before being fitted into the preform 10a, or may be applied with the plastic member 40a provided on the outside of the preform 10a. Furthermore, printing may be performed on the plastic member 40 of the composite container 10A after blow molding.

  The thickness of the plastic member 40 is not limited to this, but can be, for example, about 5 μm to 50 μm in a state of being attached to the container main body 10.

Further, since the plastic member 40 is not welded or adhered to the container body 10, it can be separated (peeled off) from the container body 10 and removed.
As a method of separation (peeling) of the plastic member 40 from the container main body 10, for example, the plastic member 40 is cut out using a cutter or the like, or a cutting line is provided on the plastic member 40 in advance. The plastic member 40 can be peeled off. Since the plastic member 40 can be separated and removed from the container main body 10 by the method as described above, the colorless and transparent container main body 10 can be recycled as in the prior art.

Composite preform 70
As shown in FIG. 2, the composite preform 70 of the present invention is made of a plastic material including a mouth 11a, a body 20a connected to the mouth 11a, and a bottom 30a connected to the body 20a. It is characterized by comprising a reform 10a and a plastic member 40a provided so as to surround the outside of the preform 10a.
The composite container 10A can be manufactured by subjecting such a composite preform 70 to biaxial stretch blow molding.

Preform 10a
As shown in FIG. 2, the preform 10a includes a mouth 11a, a body 20a connected to the mouth 11a, and a bottom 30a connected to the body 20a. Among these, the opening 11 a corresponds to the opening 11 of the container main body 10 described later, and has substantially the same shape as the opening 11. The body 20a corresponds to the neck 13, the shoulder 12 and the body 20 of the container body 10, and has a substantially cylindrical shape. The bottom 30 a corresponds to the bottom 30 of the container body 10 and has a substantially hemispherical shape.

Plastic member 40a
As shown in FIG. 2, the plastic member 40a is attached to the outer surface of the preform 10a without being adhered, and is closely attached to the preform 10a so as not to move or rotate, or falls by its own weight. It is closely attached to the extent not to. The plastic member 40a is provided over the entire circumferential direction so as to surround the preform 10a, and has a circular horizontal cross section.
As shown in FIG. 3A, the plastic member 40a may have a cylindrical shape with a bottom, and may have a cylindrical body 41 and a bottom 42 connected to the body 41. In this case, since the bottom 42 of the plastic member 40a covers the bottom 30a of the preform 10a, various functions and characteristics can be imparted to the bottom 30 in addition to the body 20 of the composite container 10A.
Further, as shown in FIG. 3B, the plastic member 40a may have a cylindrical shape with no bottom as a whole, and may have a cylindrical body portion 41.
Further, as shown in FIG. 3C, the plastic member 40a may be a bottomless cylindrical shape produced by forming a film in a cylindrical shape and bonding the end portions thereof.
In the case of the plastic member 40a shown in FIGS. 3 (b) and 3 (c), the margin 80a can be provided at one end of the plastic member 40a as described later, and the margin 80a can be thermocompression-bonded. Thereby, even if it is plastic member 40a shown in Drawing 3 (b) and (c), it can be set as plastic member 40a of a bottomed cylindrical shape. The shape of the margin 80a after the thermocompression bonding is not particularly limited, and can be any shape as shown in FIG.
The plastic member 40a may be formed of a single layer or may be formed of multiple layers.

The plastic member 40a may have an effect of shrinking the preform 10a, or may not have an effect of shrinking.
After blow molding, the plastic member 40a has a function of contracting with respect to the preform 10a from the viewpoint of little air entering between the container body and the plastic member 40, that is, high adhesion. It is preferred that

Method of Manufacturing Composite Container 10A The method of manufacturing the composite container 10A of the present invention
Preparing a composite preform 70 comprising a preform 10a and a plastic member 40a provided so as to surround the outside of the preform 10a;
A step of obtaining a composite container 10A of the present invention comprising blow molding of the composite preform 70 in a mold and the container body 10 made of a plastic material and a plastic member 40 provided in close contact with the outside of the container body 10; ,
Including.
Each step will be described in detail below.

Step of Preparing Composite Preform 70 The method of the present invention includes the step of preparing a composite preform 70 comprising a preform 10a and a plastic member 40a provided so as to surround the outside of the preform 10a.

In one embodiment, the preform 10a can be manufactured by injection molding the above-described resin material or the like using a conventionally known device.
Moreover, the container main body 10 can be made into the multilayer molded bottle of two or more layers by producing the multilayer preform 10a of two or more layers by co-injection molding.
For example, the interlayer includes a resin (interlayer) having gas barrier properties and light shielding properties such as MXD6, MXD6 + fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate). After forming a preform 10a having three or more layers as a layer consisting of the above, a multilayer molded bottle having gas barrier properties, light shielding properties and the like can be obtained by blow molding. In addition, you may use resin etc. which blended the various resin mentioned above as an intermediate | middle layer.

  Further, by mixing an inert gas (nitrogen gas, argon gas) with the melt of the thermoplastic resin, a foam preform having a foam cell diameter of 0.5 to 100 μm is formed, and this foam preform is blow molded. Thus, the container body 10 may be manufactured. Since such a container main body 10 incorporates a foam cell, the light shielding property of the entire container main body 10 can be enhanced.

  In addition, it is not limited to what was manufactured by the said method, You may use preform 10a marketed.

In one embodiment, the plastic member 40a can be manufactured by molding a resin sheet containing the above-described resin material and the like.
As a molding method, for example, a method of forming a resin sheet in a tube shape and fusing or bonding the end portions thereof may be mentioned.
Further, the plastic member 40a composed of multiple layers can be obtained by molding a laminated resin sheet in which two or more resin sheets are laminated via the above-mentioned adhesive.
A commercial item may be used for the said resin sheet, and it can manufacture it by a conventionally well-known method. In the present invention, production by extrusion is preferred, and extrusion is preferably carried out by T-die method or inflation method.

In one embodiment, the plastic member 40a, as shown in FIG. 5 (a),
(1) First, the resin material 51 is heated and melted, and extruded from a die 52 into a tube shape to form a tubular parison 53,
(2) Next, as shown in FIG. 5 (b), for example, a tubular parison 53 is sandwiched by a two-divided mold 54,
(3) Next, as shown in FIG. 5 (c), air is blown into the tubular parison 53 from the blow-in nozzle 55, the tubular parison 53 is formed to match the mold 54, and is cooled, opened, and removed. By sequentially carrying out, it is possible to obtain a bottomed cylindrical plastic member 40a as shown in FIG. 5D (direct blow molding).
According to this method, by changing the design of the mold, the design of the obtained plastic member 40a can be changed, and the plastic member 40a having high adhesiveness with the preform 10a can be manufactured. .

In one embodiment, the heat-shrinkable plastic member 40a can be manufactured by the following method.
First, the above-described resin material and the like are heated and melted in the extrusion device, and the molten resin material and the like are continuously extruded from the ring die and cooled to form the unstretched extruded tube 1 (FIG. 6 (a )reference). The multi-layered plastic member 40a can be manufactured by co-extruding two or more resin materials.
Then, one end of the extruded tube is closed by welding or bonding one end of the unstretched extruded tube.
Further, the extrusion tube 1 closed at one end is placed in a mold 2 having an inner diameter larger than the outer diameter of the extrusion tube 1 (see FIG. 6 (b)).
Next, the blow device 3 is disposed (mounted) at the other end of the extrusion tube 1 (see FIG. 6C). At this time, it is preferable that the blow device 3 be in close contact with the extrusion tube 1 so that air does not leak from between them.
Subsequently, the extrusion tube 1, the mold 2 and the blow device 3 are sent to the heating furnace 4 as they are arranged, and heated to 70 to 150 ° C. inside the heating furnace 4 (see FIG. 6 (d)). As the heating furnace 4, a hot air circulation heating furnace may be used in order to make the inside thereof have a uniform temperature. Alternatively, the extrusion tube 1, the mold 2 and the blow device 3 may be heated by passing them through the heated liquid.
Next, the extrusion tube 1, the mold 2 and the blow device 3 are taken out of the heating furnace 4, and air is blown out from the blow device 3 into the extrusion tube 1 to pressure stretch the inner surface of the extrusion tube 1. Thereby, the extrusion tube 1 is expanded and diameter-expanded along the inner surface shape of the metal mold 2 (refer FIG.6 (e)).
Thereafter, the extrusion tube 1 is cooled in cold water while the air is blown out from the blowing device 3 and the extrusion tube is taken out of the mold 2 (see FIG. 6 (f)). By cutting this into a desired size, a heat-shrinkable plastic member 40a can be obtained (see FIG. 6 (g)).

  In one embodiment, the plastic member 40a can also be obtained by an injection molding method. Specifically, first, a mixture containing the above-described resin material and the like is heated and melted. The heated and melted mixture is then injected into a mold. The plastic member 40a can also be obtained by cooling this and taking it out of the mold.

  In addition, it is not limited to the plastic member 40a manufactured by the said method, You may use what is marketed.

  If the plastic member 40a is not heat-shrinkable, the composite preform 70 can be obtained by fitting the preform 10a into the plastic member 40a.

When the plastic member 40a is a heat shrinkable, the composite preform 70 can be obtained by heating the plastic member 40a after the preform 10a is fitted into the plastic member 40a.
At this time, the heating method is not particularly limited, and can be appropriately performed using infrared rays, warm air or the like. The heating temperature is preferably 60 ° C. or more and 250 ° C. or less, and more preferably 80 ° C. or more and 150 ° C. or less. The heating temperature is the surface temperature of the heat-shrinkable plastic member 40a at the time of heating, not the irradiation temperature of infrared rays, warm air or the like.

In one embodiment, when the plastic member 40a has a tubular shape as shown in FIGS. 3 (b) and 3 (c), as shown in FIG. 7, the plastic member 40a includes the preform 10a. A portion (margin portion 80a) longer than the sum of the body portion 20a and the bottom portion 30a can be provided, and this margin portion 80a can be thermocompression-bonded.
The method of thermocompression bonding is not particularly limited, and is not particularly limited as long as it can be crimped by sandwiching a margin heated by infrared rays, warm air or the like, for example, metal or heat resistance A resin-made device (hereinafter sometimes referred to as a “crimp device”) may be used, and they may be combined.

  The surface of the crimping tool may be flat, or may have an uneven shape partially or entirely.

  The crimping tool may have a heating mechanism on its surface. Thereby, the crimping | compression-bonding strength of the margin part 80a can be raised more. It is preferable that the heating temperature of the crimping tool surface be, for example, 100 ° C. or more and 250 ° C. or less. Further, from the viewpoint of maintaining a good appearance of the surface of the plastic member 40a, the pressure bonding time is preferably 5 seconds or less.

The pressure at the time of pressure bonding is preferably 50 N / cm ² or more and 1000 N / cm ² or less, and more preferably 100 N / cm ² or more and 500 N / cm ² or less.

  The temperature of the heat-shrinkable plastic member 40a at the time of pressure bonding is preferably 80 ° C. or more and 200 ° C. or less, depending on the material.

  Further, the margin 80a after the thermocompression bonding may be cut into an appropriate length as desired. By cutting the margin portion to an appropriate length (for example, about 2 mm), the appearance of the bottom portion in the composite container is improved.

Blow Molding Process The composite preform 70 is subjected to biaxial stretch blow molding to expand the preform 10a of the composite preform 70 and the plastic member 40a integrally, thereby obtaining the composite container 10A shown in FIG. it can.

  Hereinafter, based on FIG. 8 (a)-(d), the manufacturing method of 10 A of composite containers of this invention is demonstrated in more detail.

First, the composite preform 70 is heated by the heating device 51 (see FIG. 8A). At this time, the composite preform 70 is uniformly heated in the circumferential direction by the heating device 51 while rotating with the mouth 11 a facing downward. The heating temperature of the preform 10a and the plastic member 40a in this heating step may be, for example, 90 ° C to 130 ° C.
Moreover, this heating can be suitably performed using infrared rays, warm air, or the like.

Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50 (see FIG. 8B).
In one embodiment, the blow molding die 50 is composed of a pair of barrel molds 50a and 50b and a bottom mold 50c which are separated from each other (see FIG. 8 (b)).

  As shown in FIG. 9, the inner surface of the body mold 50a (50b) is formed with irregularities 43 'corresponding to the fine irregularities 43 formed on the surface of the plastic member 40. As shown in FIG.

  The fine asperities 43 ′ provided on the inner surface of the mold can have a height (depth) corresponding to the fine asperities 43 formed on the plastic member 40. That is, the height (depth) can be 1 μm or more and 200 μm or less. In addition, the height (depth) can be 1 μm or more and 100 μm or less, or the height (depth) can be 1 μm or more and 50 μm or less.

  In one embodiment, the inner surface of the body mold 50a (50b) is provided with a ridge 44 formed on the surface of the plastic member 40, and a recess 44 'corresponding to the recess (not shown), A ridge (not shown) is formed.

The height (depth) of the ridges and grooves provided on the inner surface of the mold is greater than the height (depth) of the ridges and grooves formed on the plastic member 40 Is preferred.
With such a configuration, it is possible to surprisingly form the ridges and the ridges clearly on the surface of the plastic member 40.
More preferably, the height (depth) (A) of the ridges and grooves provided on the inner surface of the mold and the height of ridges and grooves formed on the plastic member 40 (Depth) (B) preferably satisfies the following relationship.
A ≧ B × 1.2
For example, the height (depth) of the ridges (concave ridges) provided on the inner surface of the mold can be set to 300 μm or more and 2000 μm or less.

In FIG. 9, although what showed unevenness 43 'and concave stripe part 44' in trunk 50a was expressed, it is not limited to this, unevenness etc. are formed also in trunk mold 50b. It may be formed on the surface of the bottom mold 50c.
By forming different irregularities or the like on the mold 50a and the mold 50b, it is possible to obtain a container to which a design different according to the surface is given, and to further improve the design.

In one embodiment, the fine irregularities can be formed by performing embossing such as blasting and etching on the mold.
Moreover, in one embodiment, the concave streaks and the convex streaks can be formed by cutting the mold.
In addition, it is not restricted to the said method, fine unevenness | corrugation, a convex streak, and a concave streak may be formed at the stage of manufacture of a metal mold | die.

  As shown in FIG. 8B, the pair of body molds 50a and 50b are mutually open, and the bottom mold 50c is raised upward. In this state, the composite preform 70 is inserted between the pair of body molds 50a and 50b.

  Next, as shown in FIG. 8C, after the bottom mold 50c is lowered, the pair of barrel molds 50a and 50b is closed, and the pair of barrel molds 50a and 50b and the bottom mold 50c are used. A closed blow mold 50 is configured. Next, air is pressed into the preform 10a, and biaxial stretch blow molding is applied to the composite preform 70.

As a result, the container body 10 is obtained from the preform 10a in the blow molding die 50, and on the surface of the plastic member 40, fine irregularities and concave streaks (convex streaks) formed on the die are obtained. Corresponding unevenness and convex streaks (concave streaks) are formed.
During blow molding, the barrel molds 50a, 50b are heated to 30 ° C to 80 ° C and the bottom mold 50c is cooled to 5 ° C to 25 ° C. At this time, in the blow molding die 50, the preform 10a of the composite preform 70 and the plastic member 40a are integrally expanded.

  Thus, a composite container 10A including the container body 10 and the plastic member 40 provided on the outer surface of the container body 10 is obtained.

  Next, as shown in FIG. 8D, the pair of body molds 50a and 50b and the bottom mold 50c are separated from each other, and the composite container 10A is taken out from the blow molding mold 50.

Example 1
Using an injection molding machine, a polyethylene terephthalate preform 10a (melting point: 260 ° C.) shown in FIG. 2 and having a length of 105 mm (the length of the body 20a excluding the mouth 11a and the length of the bottom 30a 85 mm) is produced. did. The weight of this preform 10a was 30 g.

Polyethylene (melting point: 80 ° C.) was melted and extruded from a ring die. Then, after the extruded tube inner surface was pressurized, or the tube outer surface was made negative pressure from the inner surface, the diameter was increased, and a heat-shrinkable plastic member 40a shown in FIG. 4B was produced. The content of the coloring agent contained in the plastic member 40a was 0.5 parts by mass with respect to 100 parts by mass of polyethylene (polyolefin resin).
Then, the preform 10a was fitted by hand from the end of the heat-shrinkable plastic member 40a opposite to the margin 80a.
The length of the plastic member 40a was 95 mm, and the margin 80a was 10 mm.

After fitting, the preform 10a and the heat-shrinkable plastic member 40a were heated to 100 ° C. using an infrared heater to thermally shrink the heat-shrinkable plastic member 40a. Then, using a metal plate heated to 100 ° C., the margin 80a was sandwiched at a pressure of 300 N / cm ² and thermocompression bonded to obtain a composite preform 70.

The composite preform 70 obtained as described above was heated to 110 ° C. using an infrared heater, and was transferred to a blow molding mold consisting of a pair of barrel mold and bottom mold. The inner surface of the body mold had fine irregularities with a height and depth of 70 μm and a concave portion with a depth of 1000 μm.
In this blow molding die, the composite preform 70 was blow molded to obtain a composite container 10A having a full filling volume of 500 mL.
On the surface of the plastic member 40 included in the composite container 10A, fine irregularities having a height (depth) of 70 μm are clearly formed to form a rubbed glass surface, and a ridge portion having a height of 600 μm. Thus, a three-dimensional pattern as shown in FIG. 1 was clearly formed.
When the plastic member 40 is observed in the width direction with a shape analysis laser microscope (manufactured by KEYENCE CORPORATION, trade name: VK-X160), fine irregularities are clearly formed and have a rubbed glass surface. The three-dimensional pattern consisting of ridges and ridges was clearly shown without being crushed.

Comparative Example 1
Without providing the plastic member 40a, a polyethylene terephthalate preform 10a was blow-molded in a similar mold to prepare a container.
The irregularities and ridges on the surface of the container obtained were crushed, and it could not be said that the pattern was properly represented.

1: Extruded tube, 2: Mold, 3: Blow device, 4: Heating furnace, 10: Container body, 10a: Preform, 10A: Composite container, 11: Container body opening, 11a: Preform opening, 12 : Container body shoulder, 13: Container body neck, 14: Container body screw, 17: container body flange, 20: container body, 20a: preform body, 30: container bottom, 30a: preform Bottom part 31: recessed part 32: ground part 40: plastic member 40a: plastic member before blow molding 41: barrel of plastic member 42: bottom of plastic member 43, 43 ': unevenness 44: convex line 44 ': concave line 50: blow molding mold 50a and 50b: body mold 50c: bottom mold 51: resin material 52: die 53: parison 54 Die, 70: composite preform, 80a: margin

Claims (11)

A mouth, a neck provided below the mouth, a shoulder provided below the neck, a body provided below the shoulder, and a bottom provided below the body A container body provided;
And a plastic member provided in close contact with the outside of the container body,
The container body and the plastic member are an integrally expanded blow-molded article,
A composite container characterized in that the plastic member has a rubbed glass-like surface by having fine irregularities of height (depth) of 1 μm or more and 200 μm or less.   The composite container according to claim 1, wherein the fine asperities form characters and / or patterns.   The composite container according to claim 1 or 2, wherein the plastic member has a three-dimensional pattern formed by a convex portion having a height of 250 μm or more and 1000 μm or less and / or a concave portion having a depth of 250 μm or more and 1000 μm or less. .   The composite container according to any one of claims 1 to 3, wherein the melting point of the resin material which is the main constituent component of the container body is higher than the melting point of the resin material which is the main constituent component of the plastic member.   The composite container as described in any one of Claims 1-4 whose melting | fusing point of the resin material which is a main component of the said plastic members is 50 degreeC or more and 120 degrees C or less.   The composite container according to any one of claims 1 to 5, wherein a resin material which is a main constituent component of the plastic member is a polyolefin resin.   The difference between the melting point of the resin material as the main component contained in the container body and the melting point of the resin material as the main component contained in the plastic member is 30 ° C. or more and 210 ° C. or less. The composite container as described in any one of 1-6. It is a manufacturing method of the compound container according to any one of claims 1 to 7,
Preparing a composite preform comprising a preform and a plastic member provided to surround the outside of the preform;
Blow molding the composite preform in a mold;
Method, characterized in that it comprises. A mold for use in the method of manufacturing a composite container according to claim 8, which is a mold
A mold having fine irregularities of a height (depth) of 1 μm or more and 200 μm or less on its inner surface. On the inner surface, there are provided a ridge and / or a ridge corresponding to a ridge and / or a ridge formed on the surface of the plastic member of the composite container,
The height (depth) of the convex streak and / or concave streak formed on the surface of the plastic member by the height (depth) of the concave streak and / or the convex streak of the mold 10. A mold according to claim 9, which is larger. The height (depth) (A) of the grooves and / or ridges of the mold and the height of the ridges and / or grooves formed on the surface of the plastic member (A) The mold according to claim 10, wherein the depth (B) satisfies the following relationship.
A ≧ B × 1.2