JP2018104051A - Composite container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite container comprising a plastic-made member in which a three-dimensional pattern having fine convex parts and/or concave parts is formed on the surface.SOLUTION: The composite container of the present invention comprises a container body and a plastic-made member which is provided as adhering to the outside of the container body. The plastic-made member has a three-dimensional pattern formed on the surface and the three-dimensional pattern includes convex parts and/or concave parts each of which has a height (depth) of 20 μm to 100 μm.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a composite container including a container body and a plastic member. More specifically, the present invention relates to a composite container including a container body and a plastic member having a three-dimensional pattern having fine convex portions and / or concave portions on the surface.

  Recently, plastic bottles for storing content liquids have become common, and such plastic bottles store content liquids.

  A plastic bottle containing such a content liquid is manufactured by inserting a preform into a mold and biaxially stretch-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 form a container shape. However, in the conventional biaxial stretch blow molding method, the preform is generally simply formed into a container shape. For this reason, when various functions and characteristics (barrier property, heat retaining property, etc.) are given to the container, the means is limited, for example, by changing the material constituting the preform. In particular, it is difficult to have different functions and characteristics depending on the part of the container (for example, the trunk and the bottom).

  In the previous application (Japanese Patent Application Laid-Open No. 2015-128858), the present applicant has proposed a composite container including a container body and a plastic member that can impart various functions and characteristics to the container. doing.

JP2015-128858A

  On the surface of the plastic member provided in the composite container, various patterns and character information are formed by printing or the like, but due to the variety of consumer tastes, the surface is made of plastic with a three-dimensional pattern formed The demand for components is increasing. Conventionally, a three-dimensional pattern has been formed on the surface of a plastic container by blow molding, but it has been difficult to express a fine pattern because of the low followability of the container.

  The problem to be solved by the present invention is to provide a composite container including a plastic member having a surface on which a three-dimensional pattern having fine convex portions and / or concave portions is formed.

  The composite container of the present invention includes a container body and a plastic member provided in close contact with the outside of the container body, the plastic member has a three-dimensional pattern formed on the surface thereof, and the three-dimensional pattern is 20 μm or more, It has a convex part and / or a concave part having a height (depth) of 100 μm or less.

  In the said aspect, it is preferable that melting | fusing point of the resin material which is the main structural components of the said container main body is higher than melting | fusing point of the resin material which is the main structural components of the said plastic members.

  In the said aspect, it is preferable that melting | fusing point of the resin material which is a main structural component of a plastic member is 50 to 200 degreeC.

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

  In the above aspect, the difference between the melting point of the resin material that is the main constituent component contained in the container body and the melting point of the resin material that is the main constituent component contained in the plastic member is 30 ° C. or higher and 210 ° C. or lower. It is preferable.

  In the said aspect, it is preferable to have the part whose width | variety h of a solid pattern is 10 micrometers or more and 1000 micrometers.

  ADVANTAGE OF THE INVENTION According to this invention, a composite container provided with the plastic member in which the solid pattern which has a fine convex part and / or a recessed part was formed in the surface can be provided.

FIG. 1 is a partial vertical sectional view of a composite container 10A of the present invention. FIG. 2 is a front view of the composite container 10A of the present invention. FIG. 3 is a partial vertical sectional view of the composite preform 70 of the present invention. 4A to 4C are perspective views showing various plastic members 40a. FIG. 5 is a diagram showing the shape of a blank portion that is thermocompression bonded. FIG. 6 is a schematic view showing an embodiment of a method for producing the plastic member 40a. FIG. 7 is a schematic view showing an embodiment of a method for producing the plastic member 40a. FIG. 8 is a vertical sectional view showing a state in which the preform 10a is fitted into the plastic member 40a. FIG. 9 is a schematic view showing an embodiment of a method for producing the composite container 10A. FIG. 10 is an analysis image of the three-dimensional pattern formed on the surface of the composite container 10A obtained in Example 1 by a shape analysis laser microscope. FIG. 11 is an analysis image of a three-dimensional pattern formed on the surface of the container obtained in Comparative Example 1 using a shape analysis laser microscope.

Composite container 10A
As shown in FIG. 1, the composite container 10 </ b> A includes a container main body 10 positioned on the inner side and a plastic member 40 that is provided in close contact with the outer side of the container main body 10 and has a three-dimensional pattern on the surface thereof.

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

  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 portion 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 having a substantially uniform diameter. The shoulder 12 is located between the neck 13 and the trunk 20 and has a shape whose diameter gradually increases from the neck 13 toward the trunk 20.

  Furthermore, the trunk | drum 20 has a cylindrical shape with 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. Or the trunk | drum 20 may have a cylinder shape with a horizontal cross section which is not uniform toward upper direction from the downward direction. Moreover, in this Embodiment, although the unevenness | corrugation is not formed in the trunk | drum 20, and has a substantially flat surface, it is not restricted to this. For example, unevenness such as a panel or a groove may be formed on the body portion 20.

  The bottom portion 30 has a concave portion 31 located in the center and a grounding portion 32 provided around the concave portion 31. The shape of the bottom 30 is not particularly limited, and may have a conventionally known bottom shape (for example, a petaloid bottom shape or a round bottom shape).

  In addition, the thickness of the container body 10 in the body 20 is not limited to this, but for example, when the inner volume of the container body 10 is 500 mL and the weight of the container body 10 is 20 g, 50 μm to 250 μm. Can be about. 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 50 μm to 350 μm. Thus, by reducing the thickness of the container main body 10, the weight of the container main body 10 can be reduced.

The container body 10 can include a resin material such as polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, polycarbonate, ionomer resin, or a blend of these.
Among the resin materials described above, polyethylene terephthalate is preferable from the viewpoint of heat resistance.
In addition, the preform 10a may contain colorants such as red, blue, yellow, green, brown, black, and white. However, in consideration of ease of recycling, the preform 10a does not contain these colorants and is colorless. It is preferably transparent.

  In one embodiment, the container main body 10 can be manufactured by biaxially stretching blow-molding a preform 10a manufactured by injection molding the above-described resin material or the like.

  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.

  The container main body 10 may consist of a bottle with a full capacity of 100 mL to 2000 mL, for example. Alternatively, the container main body 10 may be a large bottle having a full capacity of, for example, 10L to 60L.

Plastic member 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 without being easily moved or rotated. As shown in FIG. 1, 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 by surrounding the outer side of the preform 10a as will be described later, closely contacting the outer side of the preform 10a, and then biaxially stretched and blow-molded together with the preform 10a. Can be obtained.

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

  Further, the plastic member 40 may be provided in the entire region or a partial region of the container body 10 other than the mouth portion 11. For example, the plastic member 40 may be provided so as to cover the neck portion 13, the shoulder portion 12, the trunk portion 20, and the bottom portion 30 of the container body 10 except for the mouth portion 11. Further, the number of plastic members 40 is not limited to one, and a plurality of plastic members 40 may be provided. For example, you may provide the two plastic members 40 in the outer surface of the shoulder part 12, and the outer surface of the bottom part 30, respectively.

The plastic member 40 is characterized in that a three-dimensional pattern is formed on the surface thereof (see FIG. 2).
The three-dimensional pattern on the surface of the plastic member 40 includes a variety of patterns, including various characters, floral patterns, animal patterns, streaks, dots, geometric shapes, graphics and other patterns, and braille. Character information etc. are included.
As one embodiment, as shown in FIG. 2, a flowering tree is formed by a three-dimensional pattern.
The three-dimensional pattern formed on the surface of the plastic member 40 has a fine part, and specifically, has a convex part with a height of 20 μm or more and 100 μm or less and / or a concave part with a depth of 100 μm or less. .
Further, in one embodiment, like a tree branch as shown in FIG. 2, a portion having a width h of 10 μm or more and 1000 μm or less, preferably a portion having a width of 10 μm or more and 500 μm or less can be provided.

The plastic member 40 preferably contains a resin material lower than the melting point of the resin material, which is the main component included in the container body 10, as the main component.
Surprisingly, when the plastic member 40 includes such a resin material as a main component, it is possible to form extremely fine irregularities on the surface of the plastic member 40 as compared with the prior art, and various designs. Can be expressed.
In the present invention, the “resin material which is a main constituent” refers to a 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 that is the main constituent component contained in the container body 10 and the melting point of the resin material that is the main constituent component contained in the plastic member 40 is preferably 30 ° C. or higher and 210 ° C. or lower. 50 ° C. or more and 200 ° C. or less is more preferable, and 100 ° C. or more and 180 ° C. or less is further preferable.

  The melting point of the resin material, which is the main component contained in the plastic member 40, is preferably 50 ° C. or higher and 120 ° C. or lower, and more preferably 65 ° C. or higher and 100 ° C. or lower. By setting the melting point of the resin material in the above numerical range, finer irregularities can be formed on the surface of the plastic member 40.

The resin material contained as the 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 (meth) acrylic resins such as polyacrylate, polymethacrylate and polymethylmethacrylate.
Among the resin materials described above, polyolefin resins are particularly preferable because finer concave portions and convex portions can be formed on the surface of the plastic member 40 after blow molding.

  The plastic member 40 can include 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 tree, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, diallyl phthalate, as long as the characteristics of the present invention are not impaired. Resin, fluorine resin, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, ethylene propylene rubber, butyl rubber, nitrile rubber, acrylic rubber, silicone rubber, fluoro rubber, nylon 6, nylon 6, 6, MXD6, aromatic polyamide, polycarbonate, poly (ethylene terephthalate), poly (butylene terephthalate), poly (ethylene naphthalate), U polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polyester Resin materials such as ether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulfide, polyethersulfone, silicone resin, polyurethane, phenol resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, epoxy resin, ionomer resin Can be included.

In one embodiment, the plastic member 40 may include a resin material having a gas barrier property such as an oxygen barrier property or a water vapor barrier property.
In this case, the container body 10 is not multi-layered, or the composite resin 10A is not used for the production of the container body 10 to improve the gas barrier property of the composite container 10A, prevent oxygen from entering the container, and deteriorate the content liquid. In addition, it is possible to prevent the evaporation of water vapor from the inside of the container to the outside, and to prevent the internal volume from decreasing.
Examples of such a material include polyethylene, polypropylene, nylon 6, nylon 6,6, a copolymer of nylon 6 and nylon 6,6, MXD-6, and EVOH (ethylene vinyl alcohol copolymer).

In one embodiment, the plastic member 40 may include a resin material (a resin material having a low thermal conductivity) having higher heat retention or cold retention than the material constituting the container body 10.
In this case, it is possible to make it difficult for the temperature of the content liquid to be transmitted to the surface of the composite container 10A without increasing the thickness of the container body 10. Thereby, the heat retaining property or cold retaining property of the composite container 10A can be enhanced.
Examples of such materials include foamed polyurethane, polystyrene, polyethylene, polypropylene, phenol resin, polyvinyl chloride, urea resin, silicone, polyimide, and melamine resin.

  Further, the plastic member 40 can contain various additives in addition to the resin material as the main component as long as the characteristics are not impaired. Examples of additives include plasticizers, anti-coloring agents, matting agents, deodorants, flame retardants, weathering agents, antistatic agents, yarn friction reducing agents, slip agents, mold release agents, antioxidants, and ion exchange. An agent, a color pigment, and the like can be added. Also, by mixing an inert gas (nitrogen gas, argon gas) with a melt of a thermoplastic resin, a foam member having a foam cell diameter of 0.5 to 100 μm is used, and this foam preform is molded. , The light shielding property can be improved.

The plastic member 40 may be a single layer or a multilayer.
Moreover, the thickness of the plastic member 40 is not limited to this, but can be set to, for example, about 5 μm to 50 μm in a state of being attached to the container body 10.

Further, since the plastic member 40 is not welded or bonded to the container body 10, it can be separated (separated) from the container body 10 and removed.
As a method of separating (peeling) the plastic member 40 from the container body 10, for example, the plastic member 40 is cut using a blade or the like, or a cutting line is provided in advance in the plastic member 40, and the cutting line is followed. Thus, the plastic member 40 can be peeled off. Since the plastic member 40 can be separated and removed from the container body 10 by the method as described above, the colorless and transparent container body 10 can be recycled as in the conventional case.

  Further, the surface of the plastic member 40 may be designed or printed separately from the three-dimensional pattern. Printing can be performed in conformity with the three-dimensional pattern to further improve the design.

Composite preform 70
As shown in FIG. 3, a composite preform 70 of the present invention includes a preform 10a including a mouth portion 11a, a body portion 20a connected to the mouth portion 11a, and a bottom portion 30a connected to the body portion 20a. And a plastic member 40a provided so as to surround the outside of the preform 10a.

Preform 10a
As shown in FIG. 3, the preform 10a includes a mouth portion 11a, a body portion 20a connected to the mouth portion 11a, and a bottom portion 30a connected to the body portion 20a. Of these, the mouth portion 11 a corresponds to the mouth portion 11 of the container body 10 described later, and has substantially the same shape as the mouth portion 11. Moreover, the trunk | drum 20a respond | corresponds to the neck part 13, the shoulder part 12, and the trunk | drum 20 of the container main body 10, and has a substantially cylindrical shape. The bottom 30a corresponds to the bottom 30 of the container body 10 and has a substantially hemispherical shape.

  In one embodiment, the mouth portion 11a is crystallized by a heat treatment and is in a whitened state. Thus, by producing the composite container 10A using the preform 10a having the whitened mouth portion 11a, invasion of visible light and ultraviolet rays from the mouth portion 11a can be prevented, and the contents during storage Can be prevented.

Plastic member 40a
As shown in FIG. 3, the plastic member 40a is attached to the outer surface of the preform 10a without being adhered, and is in close contact with the preform 10a so as not to move or rotate, or falls by its own weight. Close enough not to touch. 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. 4A, the plastic member 40 a has a bottomed cylindrical shape, 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 trunk 20 of the composite container 10A.
As shown in FIG. 4B, the plastic member 40a may have a bottomless cylindrical shape as a whole and may have a cylindrical body portion 41.
Moreover, as shown in FIG.4 (c), the plastic member 40a may be a bottomless cylindrical shape produced by forming a film into a cylinder shape and bonding the edge part together.
In the case of the plastic member 40a shown in FIGS. 4B and 4C, the plastic member 40a is configured to have a blank portion 80a as described later, and the blank portion 80a can be thermocompression bonded. Thereby, even if it is the plastic member 40a shown by FIG.4 (b) and (c), it can be set as the plastic member 40a of a bottomed cylindrical shape. The shape of the blank portion 80 after thermocompression bonding is not particularly limited, and can be an arbitrary shape as shown in FIG.

The plastic member 40a may have a function of contracting with respect to the preform 10a, or may not have a function of contracting.
After blow molding, the plastic member 40a has a function of contracting with respect to the preform 10a from the viewpoint of less air entering between the container body and the plastic member 40, that is, high adhesion. It is preferable.
When the plastic member 40a has a contracting action, for example, a plastic member 40a that contracts (for example, heat shrinks) with respect to the preform 10a when an external action (for example, heat) is applied is used. May be. Alternatively, the plastic member 40 itself may be contractible or elastic and can be contracted without applying an external action.

Manufacturing method of composite container 10A The manufacturing method of the composite container 10A of the present invention includes:
Preparing a composite preform 70 including a preform 10a and a plastic member 40a provided so as to surround the outside of the preform 10a;
A step of blow molding the composite preform 70 in a blow mold to obtain a composite container 10A comprising a container body 10 made of plastic material and a plastic member 40 provided in close contact with the outside of the container body 10; , Comprising.

Step of Preparing the Composite Preform 70 The method of the present invention includes the step of preparing the composite preform 70 including the preform 10a and the 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 using a conventionally known apparatus.
Moreover, the container main body 10 can be made into the multilayer molding bottle of 2 layers or more by producing the multilayer preform 10a of 2 layers or more by injection molding.
For example, the intermediate layer includes a resin (intermediate layer) 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) A multilayer molded bottle having gas barrier properties, light-shielding properties, and the like can be obtained by forming a preform 10a consisting of three or more layers as a layer and then blow-molding. As the intermediate layer, a resin blended with the various resins described above may be used.

  Further, by mixing an inert gas (nitrogen gas, argon gas) with the thermoplastic resin melt, 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 contains the foam cell, the light shielding property of the container main body 10 whole can be improved.

  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 resin material described above.
Examples of the molding method include deep-drawing molding, or a method of molding a resin sheet into a tube shape and fusing or bonding the end portions thereof.
Moreover, the plastic member 40a composed of multiple layers can be obtained by molding a laminated resin sheet obtained by laminating two or more resin sheets via the above-described adhesive.
A commercial item may be used for the said resin sheet, and it can manufacture it by a conventionally well-known method. In this invention, it is preferable to manufacture by extrusion molding, and it is preferable that extrusion molding is performed by the T-die method or the inflation method.

In one embodiment, the plastic member 40a is, as shown in FIG.
(1) First, the resin material 51 is heated and melted and extruded from the die 52 into a tube shape to form a tube-shaped parison 53.
(2) Next, as shown in FIG. 6B, for example, the tubular parison 53 is sandwiched by a two-part mold 54,
(3) Next, as shown in FIG. 6 (c), air is blown into the tubular parison 53 from the blow nozzle 55, the tubular parison 53 is molded in accordance with the mold 54, cooled, opened, and taken out. By performing sequentially, a bottomed cylindrical plastic member 40a as shown in FIG. 6D can be obtained (direct blow molding).
According to this method, the design of the plastic member 40a obtained can be changed by changing the design of the mold, and the plastic member 40a having high adhesion to the preform 10a can be produced. .

In one embodiment, the heat-shrinkable plastic member 40a can be produced by the following method.
First, the above-described resin material or the like is heated and melted in an extrusion apparatus, and the molten resin material or the like is continuously extruded from a ring die and cooled to be formed into an unstretched extruded tube 1 (FIG. 7A )reference). The multilayer plastic member 40a can be manufactured by co-extruding two or more resin materials.
Next, one end of the extruded tube is closed by welding or bonding one end of the unstretched extruded tube.
Further, the extruded tube 1 whose one end is closed is disposed in a mold 2 having an inner diameter larger than the outer diameter of the extruded tube 1 (see FIG. 7B).
Next, the blow device 3 is disposed (attached) to the other end of the extruded tube 1 (see FIG. 7C). At this time, it is preferable that the blower 3 is in close contact with the extruded tube 1 so that air does not leak between them.
Subsequently, the extruded tube 1, the mold 2, and the blow device 3 are sent to the heating furnace 4 in this arrangement and heated to 70 to 150 ° C. inside the heating furnace 4 (see FIG. 7D). As the heating furnace 4, a hot-air circulating heating furnace may be used in order to make the inside uniform. Or you may heat these by passing the extrusion tube 1, the metal mold | die 2, and the blow apparatus 3 in the heated liquid.
Next, the extruded tube 1, the mold 2 and the blow device 3 are taken out from the heating furnace 4, and air is blown into the extruded tube 1 from the blow device 3, whereby the inner surface of the extruded tube 1 is stretched under pressure. As a result, the extruded tube 1 expands and expands along the inner shape of the mold 2 (see FIG. 7E).
Thereafter, the extruded tube 1 is cooled in cold water while air is blown from the blower 3, and the extruded tube is taken out from the mold 2 (see FIG. 7 (f)). By cutting this into a desired size, a heat-shrinkable plastic member 40a can be obtained (see FIG. 7 (g)).

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

  When 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 heat-shrinkable, the composite preform 70 can be obtained by fitting the preform 10a into the plastic member 40a and then heating 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 higher and 250 ° C. or lower, and more preferably 80 ° C. or higher and 150 ° C. or lower. 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 or warm air.

Moreover, in one embodiment, when the plastic member 40a has a tubular shape as shown in FIGS. 2B and 2C, as shown in FIG. A portion (blank portion 80a) longer than the length of the body portion 30a excluding the mouth portion 11a is provided, and the 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 blank portion heated by infrared rays or warm air, for example, metal or heat resistant These resin-made instruments (hereinafter, sometimes referred to as “crimping instruments”) may be used, or they may be combined.

  The surface of the crimping device may be flat or partially or entirely uneven.

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

The pressure during pressure bonding is preferably 50 N / cm ² or more and 1000 N / cm ² or less, 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 higher and 200 ° C. or lower, although it depends on the material.

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

The composite preform 70 is biaxially stretched and blow molded in a blow mold in which a pattern corresponding to the three-dimensional pattern formed on the surface of the plastic member 40 is formed on the inner surface of the blow molding process by engraving or the like. The composite container 10A shown in FIG. 1 can be obtained by inflating the preform 10a of the reform 70 and the plastic member 40a together.

  Hereinafter, based on FIG. 9 (a)-(d), it demonstrates in detail about the manufacturing method of 10 A of composite containers of this invention.

First, the composite preform 70 is heated by the heating device 51 (see FIG. 9A). At this time, the composite preform 70 is evenly heated in the circumferential direction by the heating device 51 while rotating with the mouth portion 11a facing downward.
The heating temperature of the preform 10a and the plastic member 40a in this heating step is, for example, preferably 90 ° C. or higher and 130 ° C. or lower, and more preferably 95 ° C. or higher and 120 ° C. or lower.
By setting the heating temperature within the above numerical range, it is possible to form favorable irregularities on the surface of the plastic member 40a while preventing defects such as whitening of the plastic member 40a from occurring.
Moreover, this heating can be suitably performed using an apparatus that generates infrared rays, hot air, or the like.
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 or warm air.

  Subsequently, the composite preform 70 heated by the heating device 51 is sent to the blow molding die 50 (see FIG. 9B).

In one embodiment, a three-dimensional pattern on the surface of the plastic member 40 is molded using the blow molding die 50.
In the periphery of the blow molding die 50, there are formed a concave portion provided on the surface of the plastic member 40, and a convex portion and a concave portion corresponding to the three-dimensional pattern having the convex portion. By blow-molding the preform 70, a three-dimensional pattern having concave and convex portions is formed on the surface of the plastic member 40a.
Moreover, the recessed part and convex part in a metal mold | die can be formed by cutting etc.

  In one embodiment, the blow mold 50 includes a pair of body molds 50a and 50b and a bottom mold 50c that are divided from each other (see FIG. 9B). In FIG. 9B, the pair of body molds 50a and 50b are open to each other, 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. 9C, after the bottom mold 50c is lowered, the pair of body molds 50a and 50b are closed, and the pair of body molds 50a and 50b and the bottom mold 50c are used. A sealed blow molding die 50 is configured. Next, air is press-fitted into the preform 10a, and biaxial stretch blow molding is performed on the composite preform 70. At the same time, on the surface of the plastic member 40a, the concave and convex portions formed in the mold are formed. A three-dimensional pattern having corresponding convex portions and concave portions is formed, and a composite container 10A is obtained.
During this time, the body molds 50a and 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 mold 50, the preform 10a of the composite preform 70 and the plastic member 40a are expanded as a unit. Thereby, the preform 10a and the plastic member 40a are integrally formed into a shape corresponding to the inner surface of the blow mold 50.

  After blow molding, as shown in FIG. 9 (d), the pair of body molds 50 a, 50 b and the bottom mold 50 c are separated from each other, and the composite container 10 </ b> A is taken out from the blow mold 50.

Other Steps Printing on the plastic member 40 can be performed by a printing method such as an inkjet method, a gravure printing method, an offset printing method, or a flexographic printing method.
For example, when the ink jet method is used, a printing layer can be formed by applying UV curable ink to the plastic member 40a (40), irradiating it with UV, and curing it. This printing may be performed on the plastic member 40a before being fitted into the preform 10a, or may be performed in a state where the plastic member 40a is provided outside the preform 10a. Furthermore, the plastic member 40 of the composite container 10A after blow molding may be printed.

<Example 1>
(Process for preparing composite preform 70)
Using an injection molding machine, a polyethylene terephthalate preform 10a (melting point: 260 ° C.) having a length of 105 mm (the length of the body portion 30a excluding the mouth portion 11a) shown in FIG. 3 was produced. The weight of this preform 10a was 30 g.

Polyethylene (melting point: 80 ° C.) was melted and extruded from a ring-shaped die. Next, after pressurizing the extruded tube inner surface or making the tube outer surface negative pressure from the inner surface, the diameter was expanded to produce a heat-shrinkable plastic member 40a shown in FIG. The content of the colorant contained in the plastic member 40a was 0.5 parts by mass with respect to 100 parts by mass of polyethylene (polyolefin resin).
Moreover, the length of the plastic member 40a was 95 mm, and the margin 80a was 10 mm.

  Next, the preform 10a was fitted by hand from the end opposite to the blank portion 80a of the heat-shrinkable plastic member 40a.

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

(Blow molding process of composite preform 70)
The composite preform 70 obtained as described above is heated to 110 ° C. using an infrared heater, and a blow molding die in which a pattern corresponding to a three-dimensional pattern to be formed on the plastic member 40 is carved on the inner surface thereof. Conveyed.
In this blow mold, the composite preform 70 is blow-molded, the full capacity is 500 mL, and the surface of the plastic member 40 is 300 μm deep and 500 μm wide formed in the blow mold 50. A composite container 10A was obtained in which the portion corresponding to the concave pattern was clearly formed as a three-dimensional pattern consisting of convex portions having a height of 24 μm and a width of 500 μm.
When the surface of the formed three-dimensional pattern was observed in the width direction with a shape analysis laser microscope (trade name: VK-X160, manufactured by Keyence Corporation), the three-dimensional pattern was clearly displayed without being crushed. . An analysis image by the shape analysis laser microscope is shown in FIG.

<Comparative Example 1>
Without providing the plastic member 40a, a polyethylene terephthalate preform 10a was blow-molded in the same mold to produce a container.
The resulting three-dimensional pattern on the container surface was crushed, and it could not be said that the three-dimensional pattern was properly represented. An analysis image by a shape analysis laser microscope is shown in FIG.

Claims (6)

A container body;
A plastic member provided in close contact with the outside of the container body,
The plastic member has a three-dimensional pattern formed on its surface,
The composite container, wherein the three-dimensional pattern has convex portions and / or concave portions having a height (depth) of 20 μm or more and 100 μm or less.   The composite container according to claim 1, wherein a melting point of a resin material that is a main component of the container body is higher than a melting point of a resin material that is a main component of the plastic member.   The composite container according to claim 1, wherein a melting point of a resin material that is a main component of the plastic member is 50 ° C. or higher and 120 ° C. or lower.   The composite container as described in any one of Claims 1-3 whose resin material which is a main structural component of the said plastic members is polyolefin resin.   The difference between the melting point of the resin material that is the main constituent component contained in the container body and the melting point of the resin material that is the main constituent component contained in the plastic member is 30 ° C or higher and 210 ° C or lower. The composite container as described in any one of 1-4.   The composite container according to claim 1, wherein the three-dimensional pattern has a portion having a width h of 10 μm or more and 1000 μm.