Patent Grant
11247381
The present invention relates to a blow molding method, a composite preform, a composite container, an inner label member, and a plastic member.
Recently, bottles made of plastic are more and more commonly used as the bottles for storing drink, food, etc. in the form of liquid. Such a plastic bottle stores a specified type of liquid (filling liquid).
Such a plastic bottle for storing a filling liquid is manufactured by inserting a preform in a mold (die) and performing the biaxially oriented blow molding on the preform.
In conventional biaxially oriented blow molding methods, the formation (molding) into the shape of the container is conducted by using a preform containing a single-layer material, multilayer material or blended material of PET, PP, etc., for example. However, it is common in the conventional biaxially oriented blow molding methods to just form (mold) the preform into the container shape. Thus, even when various functions and characteristics (barrier property, warm keeping property, etc.) have to be given to the container, only limited means (e.g., changing a material constituting the preform) can be employed for achieving the object. It is especially difficult to give different functions and characteristics respectively to different parts (trunk part, bottom part, etc.) of the container.
The object of the present invention, which has been made in consideration of the above-described situation, is to provide a blow molding method, a composite preform, a composite container, an inner label member and a plastic member with which various functions and characteristics can be given to the container.
According to an aspect of the present invention, there is provided a blow molding method for molding a composite container, including: preparing a preform which is made of plastic material; making a composite preform including the preform and a plastic member in close contact with, the outer surface of the preform by arranging the plastic member to surround the outer surface of the preform; heating the composite preform and inserting the composite preform in a blow molding die; and integrally inflating the preform and the plastic member of the composite preform by performing blow molding on the composite preform in the blow molding die.
Preferably, in the above blow molding method, the preform includes a mouth part, a trunk part and a bottom part. The plastic member is arranged to cover the trunk part and the bottom part of the preform.
Preferably, in the above blow molding method, the preform includes a mouth part, a trunk part and a bottom part. The plastic member is arranged to cover a part of the trunk part and bottom part of the preform.
Preferably, in the above blow molding method, the plastic member has a gas barrier property or a ray barrier property.
Preferably, in the above blow molding method, the plastic member has been provided with a design or printing.
Preferably, in the above blow molding method, the plastic member is made of material having a higher warm keeping property or cool keeping property than the plastic material forming the preform.
Preferably, in the above blow molding method, the plastic member is made of material that is less slippery than the plastic material forming the preform.
Preferably, in the above blow molding method, the plastic member is an outer contractive member having a function of contracting with respect to the preform.
Preferably, in the above blow molding method, the outer contractive member contracts with respect to the preform when heat is add to the outer contractive member.
Preferably, in the above blow molding method, the plastic member is an outer contractive member having a function of contracting with respect to the preform. The making of the composite preform includes arranging the outer contractive member outside the preform and heating the preform and the outer contractive member.
According to another aspect of the present invention, there is provided a blow molding method for molding a composite container, including: preparing a preform which is made of plastic material; arranging an outer contractive member outside the preform; heating the preform and the outer contractive member and inserting the preform and the outer contractive member in a blow molding die; and integrally inflating the preform and the outer contractive member by performing blow molding on the preform and the outer contractive member in the blow molding die.
According to another aspect of the present invention, there is provided a composite preform including: a preform which is made of plastic material; and a plastic member which is arranged to surround the outer surface of the preform. The plastic member is set in close contact with the outer surface of the preform.
Preferably, in the above composite preform, the preform includes a mouth part, a trunk part and a bottom part. The plastic member is arranged to cover the trunk part and the bottom part of the preform.
Preferably, in the above composite preform, the preform includes a mouth part, a trunk part and a bottom part. The plastic member is arranged to cover a part of the trunk part and bottom part of the preform.
Preferably, in the above composite preform, the plastic member has a gas barrier property or a ray barrier property.
Preferably, in the above composite preform, the plastic member has been provided with a design or printing.
Preferably, in the above composite preform, the plastic member is made of material having a higher warm keeping property or cool keeping property than the plastic material forming the preform.
Preferably, in the above composite preform, the plastic member is made of material that is less slippery than the plastic material forming the preform.
Preferably, in the above composite preform, the plastic member is an outer contractive member having a function of contracting with respect to the preform.
Preferably, in the above composite preform, the outer contractive member contracts with respect to the preform when heat is add to the outer contractive member.
According to another aspect of the present invention, there is provided a composite container including: a container body which is made of plastic material; and a plastic member which is arranged in close contact with the outer surface of the container body. The container body and the plastic member have been integrally inflated by means of blow molding.
Preferably, in the above composite container, the container body includes a mouth part, a neck part, a shoulder part, a trunk part and a bottom part. The plastic member is arranged to cover the neck part, the shoulder part, the trunk part and the bottom part of the container body.
Preferably, in the above composite container, the container body includes a mouth part, a neck part, a shoulder part, a trunk part and a bottom part. The plastic member is arranged to cover a part of the neck part, shoulder part, trunk part and bottom part of the container body.
Preferably, in the above composite container, the plastic member has a gas barrier property or a ray barrier property.
Preferably, in the above composite container, the plastic member has been provided with a design or printing.
Preferably, in the above composite container, the plastic member is made of material having a higher warm keeping property or cool keeping property than the plastic material forming the container body.
Preferably, in the above composite container, the plastic member is made of material that is less slippery than the plastic material forming the container body.
Preferably, in the above composite container, the plastic member is an outer contractive member having a function of contracting.
Preferably, in the above composite container, the outer contractive member contracts when heat is add thereto.
According to another aspect of the present invention, there is provided a plastic member which is used for making a composite container including a preform and the plastic member in close contact with the outer surface of the preform by arranging the plastic member to surround the outer surface of the preform and heating the plastic member integrally with the preform. The plastic member includes a trunk part in a tubular shape which covers at least a trunk part of the preform.
According to another aspect of the present invention, there is provided a blow molding method for molding a composite container, including: preparing a preform which is made of plastic material; making a composite preform including the preform, an inner label member in close contact with the outer surface of the preform, and a plastic member in close contact with the outer surface of the inner label member by arranging the inner label member to surround the outer surface of the preform and arranging the plastic member outside the inner label member; heating the composite preform and inserting the composite preform in a blow molding die; and integrally inflating the preform, the inner label member and the plastic member of the composite preform by performing blow molding on the composite preform in the blow molding die.
Preferably, in the above blow molding method, the preform includes a mouth part, a trunk part and a bottom part. The inner label member and the plastic member are arranged to cover the trunk part and the bottom part of the preform.
Preferably, in the above blow molding method, the preform includes a mouth part, a trunk part and a bottom part. The inner label member and the plastic member are arranged to cover a part of the trunk part and bottom part of the preform.
Preferably, in the above blow molding method, at least one of the plastic member and the inner label member has a gas barrier property or a ray barrier property.
Preferably, in the above blow molding method, at least one of the plastic member and the inner label member has been provided with a design or printing.
Preferably, in the above blow molding method, at least one of the plastic member and the inner, label member is made of material having a higher warm keeping property or cool keeping property than the plastic material forming the preform.
Preferably, in the above blow molding method, the plastic member is made of material that is less slippery than the plastic material forming the preform.
Preferably, in the above blow molding method, the plastic member is an outer contractive member having a function of contracting with respect to the preform.
Preferably, in the above blow molding method, the outer contractive member contracts with respect to the preform when heat is add to the outer contractive member.
Preferably, in the above blow molding method, the plastic member is an outer contractive member having a function of contracting with respect to the preform. The making of the composite preform includes: arranging the inner label member outside the preform and arranging the outer contractive member outside the inner label member; and heating the preform, the inner label member and the outer contractive member.
According to another aspect of the present invention, there is provided a blow molding method for molding a composite container, including: preparing a preform which is made of plastic material; arranging an inner label member outside the preform and arranging an outer contractive member outside the inner label member; heating the preform, the inner label member and the outer contractive member and inserting the preform, the inner label member and the outer contractive member in a blow molding die; and integrally inflating the preform, the inner label member and the outer contractive member by performing blow molding on the preform, the inner label member and the outer contractive member in the blow molding die.
According to another aspect of the present invention, there is provided a composite preform including: a preform which is made of plastic material; an inner label member which is arranged to surround and to be in close contact with the outer surface of the preform; and a plastic member which is arranged in close contact with the outer surface of the inner label member.
Preferably, in the above composite preform, the preform includes a mouth part, a trunk part and a bottom part. The inner label member and the plastic member are arranged to cover the trunk part and the bottom part of the preform.
Preferably, in the above composite preform, the preform includes a mouth part, a trunk part and a bottom part. The inner label member and the plastic member are arranged to cover a part of the trunk part and bottom part of the preform.
Preferably, in the above composite preform, at least one of the plastic member and the inner label member has a gas barrier property or a ray barrier property.
Preferably, in the above composite preform, at least one of the plastic member and the inner label member has been provided with a design or printing.
Preferably, in the above composite preform, at least one of the plastic member and the inner label member is made of material having a higher warm keeping property or cool keeping property than the plastic material forming the preform.
Preferably, in the above composite preform, the plastic member is made of material that is less slippery than the plastic material forming the preform.
Preferably, in the above composite preform, the plastic member is an outer contractive member having a function of contracting with respect to the preform.
Preferably, in the above composite preform, the outer contractive member contracts with respect to the preform when heat is add to the outer contractive member.
According to another aspect of the present invention, there is provided a composite container including: a container body which is made of plastic material; an inner label member which is arranged to surround and to be in close contact with the outer surface of the container body; and a plastic member which is arranged in close contact with the outer surface of the inner label member. The container body, the inner label member and the plastic member have been integrally inflated by means of blow molding.
Preferably, in the above composite container, the container body includes a mouth part, a neck part, a shoulder part, a trunk part and a bottom part. The inner label member and the plastic member are arranged to cover the neck part, the shoulder part, the trunk part and the bottom part of the container body.
Preferably, in the above composite container, the container body includes a mouth part, a neck part, a shoulder part, a trunk part and a bottom part. The inner label member and the plastic member are arranged to cover a part of the neck part, shoulder part, trunk part and bottom part of the container body.
Preferably, in the above composite container, at least one of the plastic member and the inner label member has a gas barrier property or a ray barrier property.
Preferably, in the above composite container, at least one of the plastic member and the inner label member has been provided with a design or printing.
Preferably, in the above composite container, at least one of the plastic member and the inner label member is made of material having a higher warm keeping property or cool keeping property than the plastic material forming the container body.
Preferably, in the above composite container, the plastic member is made of material that is less slippery than the plastic material forming the container body.
Preferably, in the above composite container, the plastic member is an outer contractive member having a function of contracting.
Preferably, in the above composite container, the outer contractive member contracts when heat is add thereto.
According to another aspect of the present invention, there is provided an inner label member which is used for making a composite preform including a preform, the inner label member in close contact with the outer surface of the preform, and a plastic member in close contact with the outer surface of the inner label member by arranging the inner label member on the inside of the plastic member to surround the outer surface of the preform and heating the inner label member integrally with the preform and the plastic member. The inner label member includes a trunk part in a tubular shape which covers a trunk part of the preform.
According to another aspect of the present invention, there is provided a plastic member which is used for making a composite preform including a preform, an inner label member in close contact with the outer surface of the preform, and the plastic member in close contact with the outer surface of the inner label member by arranging the plastic member outside the inner label member to surround the outer surface of the preform and heating the plastic member integrally with the preform and the inner label member. The plastic member includes a trunk part in a tubular shape which covers a trunk part of the preform.
According to the present invention, the preform and the plastic member of the composite preform are integrally inflated by performing the blow molding on the composite preform in the blow molding die. Therefore, the preform (container body) and the plastic member can be formed of different members (materials), and various functions and characteristics can be given to the composite container by properly selecting the type and shape of the plastic member.
A first embodiment of the present invention will be described below with reference to figures.
First, the outline of a composite container manufactured by a blow molding method according to this embodiment will be described below with reference to
The composite container 10A shown in
Such a composite container 10A includes an internally arranged container body 10 which is made of plastic material and a plastic member 40 which is arranged in close contact with the outer surface of the container body 10.
The container body 10 includes a mouth part 11, a neck part 13 formed below the mouth part 11, a shoulder part 12 formed below the neck part 13, a trunk part 20 formed below the shoulder part 12, and a bottom part 30 formed below the trunk part 20.
On the other hand, the plastic member 40 is thinly stretched and fixed on the outer surface of the container body 10 in close contact with the outer surface so that the plastic member 40 cannot easily move or rotate with respect to the container body 10.
Next, the container body 10 will be explained in detail. As explained above, the container body 10 includes the mouth part 11, the neck part 13, the shoulder part 12, the trunk part 20 and the bottom part 30.
The mouth part 11 includes a screw part 14 onto which a cap (unshown) will be screwed and a flange part 17 which is formed below the screw part 14. The mouth part 11 may be formed in a conventionally-known shape.
The neck part 13, situated between the flange part 17 and the shoulder part 12, has a substantially cylindrical shape that is virtually uniform in diameter. The shoulder part 12, situated between the neck part 13 and the trunk part 20, is in a shape whose diameter gradually increases from the side of the neck part 13 toward the side of the trunk part 20.
The trunk part 20 has a cylindrical shape that is substantially uniform in diameter as a whole. However, the shape of the trunk part 20 is not restricted to this example; the trunk part 20 may also be formed in a polygonal tube shape (quadrangle tube, octagonal tube, etc.), in a tubular shape whose horizontal cross sections are not uniform from top to bottom, and so forth. While the trunk part 20 in this embodiment has a substantially even surface with no concavity or convexity formed thereon, the trunk part 20 may be provided with a concavity or convexity (panel, groove, etc.), for example.
On the other hand, the bottom part 30 has a concave part 31 situated at the center and a grounding part 32 formed around the concave part 31. The shape of the bottom part 30 is also not particularly limited. The bottom part 30 may be formed in a conventionally-known shape (petaloid bottom shape, round bottom shape, etc.).
The thickness of the container body 10 in the trunk part 20 can be made as thin as approximately 50 μm to 250 μm, for example, although not limited to this example. The weight of the container body 10 can be set between 10 g and 20 g (also not limited to this example). Weight reduction of the container body 10 can be achieved by thinning down the wall thickness of the container body 10 as above.
Such a container body 10 can be made by performing the biaxially oriented blow molding on the preform 10a (explained later) made by injection molding of a synthetic resin material. Thermoplastic resin is desired to be used as the material of the preform 10a (i.e., the material of the container body 10). Especially, the use of PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate) or PC (polycarbonate) is desirable. It is also possible to blend some of the aforementioned resins together for the use for the container body 10. Further, a vapor deposited 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 in order to enhance the barrier property of the container.
The container body 10 can also be made as a multilayer molded bottle made up of two or more layers. Specifically, the container body 10 may be made as a multilayer bottle having a gas barrier property and a light blocking property by, for example, first forming a preform 10a made up of three or more layers including an intermediate layer made of resin having the gas barrier property and the light blocking property (e.g., MXD6, MXD6+fatty acid salt, PGA (polyglycolic acid), EVOH (ethylene vinyl alcohol copolymer) or PEN (polyethylene naphthalate)) by means of extrusion molding or injection molding and then performing the blow molding on the preform 10a. The intermediate layer may also be made by use of the blended resin made by blending some of the aforementioned resins together.
The container body 10 may also be made by first forming an expanded preform (foamed preform) having a foam cell diameter of 0.5 to 100 μm by mixing an inert gas (nitrogen gas, argon gas, etc.) into melted thermoplastic resin and then performing the blow molding on the expanded preform. Since such a container body 10 contains foam cells, the light blocking property of the whole container body 10 can be enhanced.
Such a container body 10 may be made up of a bottle having a full capacity of 150 ml to 1500 ml, for example.
Next, the plastic member 40 will be explained below. As will be explained later, the plastic member 40 (40a) is formed by being arranged to surround the outer surface of the preform 10a, being set in close contact with the outer surface of the preform 10a, and thereafter undergoing the biaxially oriented blow molding together with the preform 10a.
The plastic member 40 is attached to the outer surface of the container body 10 without using an adhesive, in such close contact that the plastic member 40 does not move or rotate with respect to the container body 10. The plastic member 40 covers the container body 10 while being thinly stretched on the outer surface of the container body 10. As shown in
In this example, the plastic member 40 is formed to cover parts of the container body 10 other than the mouth part 11 and the neck part 13, that is, to cover the shoulder part 12, the trunk part 20 and the bottom part 30. With such a plastic member 40, intended function and characteristic can be given to the shoulder part 12, the trunk part 20 and the bottom part 30 of the container body 10.
Incidentally, the plastic member 40 may also be formed on part or all of the surface of the container body 10 other than the mouth part 11. For example, the plastic member 40 may be formed to cover the container body 10 excluding the mouth part 11 (i.e., to totally cover the neck part 13, the shoulder part 12, the trunk part 20 and the bottom part 30). The plastic member 40 may either be formed as one member or two or more members. For example, the container body 10 may be provided with two plastic members 40: one on the outer surface of the shoulder part 12 and the other on the outer surface of the bottom part 30.
Such a plastic member 40a may either be a member not having or having a function of contracting with respect to the preform 10a.
In cases where the plastic member 40a has the function of contracting with respect to the preform 10a, the plastic member (outer contractive member) 40a is formed by being arranged outside the preform 10a and undergoing the heating and the biaxially oriented blow molding integrally with the preform 10a. Materials having the function of contracting with respect to the preform 10a can be used for such a plastic member (outer contractive member) 40a. The plastic member (outer contractive member) 40a may either be a member having its own contractility or elasticity and being capable of contracting without needing an external effect exerted thereon or a member that contracts (e.g., heat shrinkage) with respect to the preform 10a when an external effect (e.g., heat) is exerted thereon.
The thickness of the plastic member 40 after being attached to the container body 10 can be set at approximately 5 μm to 50 μm, for example, although not limited to this example.
Next, the configuration of the composite preform according to this embodiment will be described below with reference to
As shown in
The preform 10a includes a mouth part 11a, a trunk part 20a connected to the mouth part 11a, and a bottom part 30a connected to the trunk part 20a. The mouth part 11a, as a part corresponding to the aforementioned mouth part 11 of the container body 10, has substantially the same shape as the mouth part 11. The trunk part 20a, as a part corresponding to the aforementioned neck part 13, shoulder part 12 and trunk part 20 of the container body 10, has a substantially cylindrical shape. The bottom part 30a, as a part corresponding to the aforementioned bottom part 30 of the container body 10, has a substantially semispherical shape.
The plastic member 40a is attached to the outer surface of the preform 10a without using an adhesive, in such close contact that the plastic member 40a does not move or rotate with respect to the preform 10a. The plastic member 40a is arranged in the entire range in regard to the circumferential direction of the preform 10a to surround the preform 10a and to have a circular horizontal section.
In this case, the plastic member 40a is formed to cover the most of the trunk part 20a, excluding a part 13a corresponding to the neck part 13 of the container body 10, and to totally cover the bottom part 30a.
Incidentally, the plastic member 40a may also be formed on part or all of the surface of the preform 10a other than the mouth part 11a. For example, the plastic member 40a may be formed to cover the preform 10a excluding the mouth part 11a, that is, to totally cover the trunk part 20a and the bottom part 30a. The plastic member 40a may either be formed as one member or two or more members. For example, two plastic members 40a may be arranged respectively on different parts of the outer surface of the trunk part 20a.
Such a plastic member 40a may either be a member not having or having the function of contracting with respect to the preform 10a.
In the latter case, a member that contracts (e.g., heat shrinkage) with respect to the preform 10a when an external effect (e.g., heat) is exerted thereon may be used as the plastic member (outer contractive member) 40a.
Possible materials of the plastic member 40 include polyethylene, polypropylene, polyethylene terephthalate, polyethylene naphthalate, poly-4-methyl-pentene-1, polystyrene, acrylonitrile-styrene resin, acrylonitrile-butadiene-styrene resin, polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, diallyl phthalate resin, fluorine-based resin, polymethyl methacrylate, polyacrylic acid, polymethyl acrylate, polyacrylonitrile, polyacrylamide, polybutadiene, polybutene-1, polyisoprene, polychloroprene, ethylene propylene rubber, isobutylene-isoprene rubber, nitrile rubber, acrylic rubber, silicone rubber, fluororubber, nylon 6, nylon 6.6, nylon MXD6, aromatic polyamide, polycarbonate, polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, U polymer, liquid crystal polymer, modified polyphenylene ether, polyether ketone, polyether ether ketone, unsaturated polyester, alkyd resin, polyimide, polysulfone, polyphenylene sulphide, polyethersulfone, silicone resin, polyurethane, phenolic resin, urea resin, polyethylene oxide, polypropylene oxide, polyacetal, and epoxy resin, for example. Among the above materials, the use of thermoplastic inelastic resin such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) is desirable. Blended material, multilayer structure and partial multilayer structure of some of the above materials are also possible. Further, the light blocking property can be enhanced by using an expanded member (foamed member) having a foam cell diameter of 0.5 to 100 μm (obtained by mixing an inert gas (nitrogen gas, argon gas, etc.) into melted thermoplastic resin) and performing the molding on the expanded preform.
The plastic member 40a may also be made of the same material as the container body 10 (preform 10a). In this case, it is possible to arrange the plastic member 40 preferentially on a part of the composite container 10A needing reinforcement and thereby selectively increase the strength of the part. For example, the plastic member 40 may be arranged on parts of the container body 10 around the shoulder part 12 and the bottom part 30 so as to increase the strength of the parts. Such a plastic member 40 (40a) may be made of thermoplastic resin such as PE (polyethylene), PP (polypropylene), PET (polyethylene terephthalate), PEN (polyethylene naphthalate) or PC (polycarbonate).
The plastic member 40a may also be made of material having the gas barrier property (oxygen barrier property, water vapor barrier property, etc.). In this case, the gas barrier property of the composite container 10A can be enhanced and the deterioration of the liquid in the bottle by oxygen and water vapor can be prevented without the need of using a multilayer preform, a preform including blended material, or the like as the preform 10a. For example, it is possible to arrange the plastic member 40 (made of such material) to totally cover the shoulder part 12, the neck part 13, the trunk part 20 and the bottom part 30 of the container body 10 and thereby enhance the gas barrier property of these parts. Such material can be PE (polyethylene), PP (polypropylene), MXD-6 (nylon) or EVOH (ethylene vinyl alcohol copolymer), for example. It is also possible to mix an oxygen absorbent (e.g., fatty acid salt) with one or more of these materials.
The plastic member 40a may also be made of material having a ray barrier property against ultraviolet rays, etc. In this case, the ray barrier property of the composite container 10A can be enhanced and the deterioration of the liquid in the bottle by ultraviolet rays, etc. can be prevented without the need of using a multilayer preform, a preform including blended material, or the like as the preform 10a. For example, it is possible to arrange such a plastic member 40a to totally cover the shoulder part 12, the neck part 13, the trunk part 20 and the bottom part 30 of the container body 10 and thereby enhance the ultraviolet ray barrier property of these parts. Such material can be blended material or material made by adding light blocking resin to PET, PE or PP. It is also possible to use an expanded member (foamed member) having a foam cell diameter of 0.5 to 100 μm made by mixing an inert gas (nitrogen gas, argon gas, etc.) into melted thermoplastic resin.
The plastic member 40a may also be made of material having a higher warm keeping property or cool keeping property (i.e., lower thermal conductivity) than the plastic material forming the container body 10 (preform 10a). In this case, the conduction of the temperature of the liquid in the composite container 10A to the surface of the composite container 10A can be reduced without the need of increasing the thickness of the container body 10 itself. Consequently, the warm keeping property or cool keeping property of the composite container 10A is enhanced. For example, it is possible to arrange the plastic member 40 (made of such material) on part or all of the trunk part 20 of the container body 10 and thereby enhance the warm keeping property or cool keeping property of the trunk part 20. Further, the composite container 10A is prevented from becoming too hot or cold for the user to hold. Such material can be foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenolic resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin, etc. It is also possible to use an expanded member (foamed member) having a foam cell diameter of 0.5 to 100 μm made by mixing an inert gas (nitrogen gas, argon gas, etc.) into melted thermoplastic resin.
The plastic member 40a may also be made of material that is less slippery than the plastic material forming the container body 10 (preform 10a). In this case, the composite container 10A can be made easy to hold for the user without the need of changing the material of the container body 10. For example, it is possible to arrange the plastic member 40 (made of such material) on part or all of the trunk part 20 of the container body 10 and thereby make the trunk part 20 easy to hold.
The plastic member 40a may also be provided with a design or printing. In this case, it becomes possible to display images and/or letters on the composite container 10A without the need of specially attaching a label or the like to the container body 10 after the blow molding. For example, it is possible to arrange the plastic member 40 (provided with a design or printing) on part or all of the trunk part 20 of the container body 10 and thereby display images and/or letters on the trunk part 20. In this case, the material of the plastic member 40 may either be the same as that of the container body 10 or different from that of the container body 10.
Next, the shape of the plastic member 40a will be explained below.
As shown in
As shown in
As shown in
Next, the blow molding method (manufacturing method of the composite container 10A) according to this embodiment will be explained below with reference to
First, the preform 10a made of plastic material is prepared (see
Subsequently, the composite preform 70, including the preform 10a and the plastic member 40a in close contact with the outer surface of the preform 10a, is made (see
In this case, the plastic member 40a may be set in close contact with the outer surface of the preform 10a by preparing the plastic member 40a as a member having an inner diameter equal to or slightly smaller than the outer diameter of the preform 10a and pressing and sliding the plastic member 40a onto the preform 10a. Alternatively, as will be explained later, the plastic member 40a may be set in close contact with the outer surface of the preform 10a also by preparing the plastic member 40a as a member having heat shrinkability, arranging the plastic member 40a on the outer surface of the preform 10a, and heating the plastic member 40a at 50° C. to 100° C. to cause the heat shrinkage.
With this method previously making the composite preform 70 by setting the plastic member 40a in close contact with the outer surface of the preform 10a as above, it becomes possible to carry out the sequence of steps for making the composite preform 70 (
Subsequently, the composite preform 70 is heated by a heating device 51 (see
Subsequently, the composite preform 70 heated by the heating device 51 is fed to a blow molding die 50 (see
The composite container 10A is formed (molded) by using the blow molding die 50. In this example, the blow molding die 50 is made up of a pair of trunk part dies 50a and 50b and a bottom part die 50c which are separate from one another (see
Subsequently, as shown in
By the blow molding, the container body 10 is obtained from the preform 10a in the blow molding die 50. Meanwhile, the trunk part dies 50a and 50b are heated up to 30° C. to 80° C. and the bottom part die 50c is cooled down to 5° C. to 25° C. In this step, the preform 10a and the plastic member 40a of the composite preform 70 are integrally inflated in the blow molding die 50. By the inflation, the preform 10a and the plastic member 40a are integrally formed into a shape corresponding to the inner surface of the blow molding die 50.
By the above process, the composite container 10A, including the container body 10 and the plastic member 40 arranged on the outer surface of the container body 10, is obtained.
Then, as shown in
Modification of Blow Molding Method
Next, a modification of the blow molding method (manufacturing method of the composite container 10A) according to this embodiment will be described below with reference to
First, the preform 10a made of plastic material is prepared (see
Subsequently, the plastic member (outer contractive member) 40a is arranged outside the preform 10a (see
Subsequently, the preform 10a and the plastic member (outer contractive member) 40a are heated by the heating device 51 (see
The plastic member (outer contractive member) 40a heated as above contracts (heat shrinkage) and is set in close contact with the outer surface of the preform 10a (see
Subsequently, the preform 10a and the plastic member (outer contractive member) 40a heated by the heating device 51 are fed to a blow molding die 50 (see
The preform 10a and the plastic member (outer contractive member) 40a are formed (molded) by using the blow molding die 50. Similarly to the above-described example of
Next, another modification of the blow molding method (manufacturing method of the composite container 10A) according to this embodiment will be described below with reference to
First, the preform 10a made of plastic material is prepared (see
Subsequently, the plastic member (outer contractive member) 40a is arranged outside the preform 10a (see
Subsequently, the preform 10a and the plastic member (outer contractive member) 40a are heated by a first heating device 55 (see
The heated plastic member (outer contractive member) 40a contracts (heat shrinkage) and is set in close contact with the outer surface of the preform 10a, by which the composite preform 70 including the preform 10a and the plastic member (outer contractive member) 40a in close contact with the outer surface of the preform 10a is obtained (see
With this method previously making the composite preform 70 by heating the plastic member (outer contractive member) 40a by use of the first heating device 55 and setting the plastic member 40a in close contact with the outer surface of the preform 10a as above, it becomes possible to carry out the sequence of steps for making the composite preform 70 (
Subsequently, the composite preform 70 is heated by a second heating device 51 (see
Subsequently, the composite preform 70 heated by the second heating device 51 is fed to a blow molding die 50 (see
The composite preform 70 is formed (molded) by using the blow molding die 50. Similarly to the above-described example of
As described above, according to this embodiment, the composite container 10A including the container body 10 and the plastic member 40 is made by integrally inflating the preform 10a and the plastic member 40a of the composite preform 70 through the blow molding of the composite preform 70 in the blow molding die 50. Accordingly, the preform 10a (container body 10) and the plastic member 40a (plastic member 40) can be formed of different members (materials). Therefore, various functions and characteristics can be given to the composite container 10A in a flexible manner by properly selecting the type and shape of the plastic member 40.
Further, according to this embodiment, there arises no need for preparing new molding equipment for the manufacture of the composite containers 10A since a standard type of blow molding apparatus can directly be used for the manufacture of the composite containers 10A.
Next, a modification of the first embodiment of the present invention will be described below with reference to
In the modification shown in
In the composite container 10A shown in
The rest of the configuration in
Besides, the rest of the configuration and the manufacturing method of the composite container 10A and the rest of the configuration and the manufacturing method of the composite preform 70 are substantially equivalent to those in the embodiment shown in
Next, a second embodiment of the present invention will be described below with reference to figures.
First, the outline of a composite container manufactured by a blow molding method according to this embodiment will be explained below with reference to
The composite container 10A shown in
Such a composite container 10A includes an internally arranged container body 10 which is made of plastic material, an inner label member 60 which is arranged in close contact with the outer surface of the container body 10, and a plastic member 40 which is arranged in close contact with the outer surface of the inner label member 60.
The container body 10 includes a mouth part 11, a neck part 13 formed below the mouth part 11, a shoulder part 12 formed below the neck part 13, a trunk part 20 formed below the shoulder part 12, and a bottom part 30 formed below the trunk part 20.
The inner label member 60 is thinly stretched on the outer surface of the container body 10 in close contact with the outer surface so that the inner label member 60 cannot easily move or rotate with respect to the container body 10.
The plastic member 40 is thinly stretched on the outer surface of the inner label member 60 and the container body 10 in close contact with the outer surface so that the plastic member 40 cannot easily move or rotate with respect to the container body 10.
There can be cases where at least part of the plastic member 40 is transparent or semitransparent. In such cases, the inner label member 60 is visible from the outside through the transparent/semitransparent part. The plastic member 40 may either be formed so that the entire plastic member 40 is transparent/semitransparent or so as to have a nontransparent part and a transparent/semitransparent part (e.g., window part). In this embodiment, a case where the entire plastic member 40 is transparent will be explained as an example.
Next, the inner label member 60 will be explained below. As will be explained later, the inner label member 60 (60a) is formed by being arranged to surround the outer surface of the preform 10a and undergoing the biaxially oriented blow molding integrally with the preform 10a and the plastic member 40a.
The inner label member 60 is attached to the outer surface of the container body 10 without using an adhesive, in such close contact that the inner label member 60 does not move or rotate with respect to the container body 10. The inner label member 60 covers the container body 10 while being thinly stretched on the outer surface of the container body 10. As shown in
In this example, the inner label member 60 is formed to cover parts of the container body 10 other than the mouth part 11 or the neck part 13, that is, to cover the shoulder part 12, the trunk part 20 and the bottom part 30. With such an inner label member 60, it is possible to add intended letters, images, etc. to the shoulder part 12, the trunk part 20 and the bottom part 30 of the container body 10, give decorativeness to the composite container 10A, make the composite container 10A display information, and so forth.
Incidentally, the inner label member 60 may also be formed on part or all of the surface of the container body 10 other than the mouth part 11. For example, the inner label member 60 may be formed to cover the container body 10 excluding the mouth part 11, that is, to totally cover the neck part 13, the shoulder part 12, the trunk part 20 and the bottom part 30. In addition, the inner label member 60 may either be formed as one member or two or more members. The inner label member 60 may either be formed in the same region as the plastic member 40 or in a region smaller than the plastic member 40. In the latter case, it is desirable that the inner label member 60 be totally covered by the plastic member 40.
The thickness of the inner label member 60 after being attached to the container body 10 can be set at approximately 5 μm to 50 μm, for example, although not limited to this example.
Next, the plastic member 40 will be explained below. As will be explained later, the plastic member 40 (40a) is formed by being arranged to surround the outer surface of the inner label member 60a and undergoing the biaxially oriented blow molding integrally with the preform 10a and the inner label member 60a.
The plastic member 40 is attached to the outer surface of the inner label member 60 without using an adhesive, in such close contact that the plastic member 40 does not move or rotate with respect to the container body 10. The plastic member 40 covers the inner label member 60 while being thinly stretched on the outer surface of the inner label member 60. As shown in
The rest of the configuration of the container body 10 and the plastic member 40 is substantially equivalent to that in the above-described first embodiment, and thus detailed explanation thereof is omitted here.
Next, the configuration of the composite preform according to this embodiment will be described below with reference to
As shown in
The inner label member 60a is set in close contact with the outer surface of the preform 10a so that the inner label member 60a cannot easily move or rotate with respect to the preform 10a. The inner label member 60a is arranged in the entire range in regard to the circumferential direction of the preform 10a to surround the preform 10a and to have a substantially circular horizontal section.
The inner label member 60a can previously be provided with a design or printing. For example, textual information such as the names of the liquid in the bottle, the manufacturer, the raw materials, and so forth may be described on the inner label member 60a in addition to a design (pattern), the name of the item (merchandise), etc. In this case, it becomes possible to display images and/or letters on the composite container 10A without the need of specially attaching a label or the like to the container body 10 after the blow molding. For example, it is possible to arrange the inner label member 60a on part or all of the trunk part 20a of the preform 10a so that images and/or letters are displayed on the trunk part 20 of the container body 10 after the molding. Accordingly, the process for adding a label to the container by use of a labeler after the container is capped tightly becomes unnecessary. Consequently, the manufacturing cost can be reduced and the manufacturing yield can be prevented from dropping.
A film made of polyester-based resin, polyamide-based resin, polyaramide-based resin, polypropylene-based resin, polycarbonate-based resin, polyacetal-based resin, fluorine-based resin, or the like can be used as such an inner label member 60a. The inner label member 60a may either be made of a material the same as or different from that of the container body 10 (preform 10a) and/or the plastic member 40a.
The following various materials may also be used for the inner label member 60a:
For example, the inner label member 60a may also be made of material having the gas barrier property (oxygen barrier property, water vapor barrier property, etc.). In this case, the gas barrier property of the composite container 10A can be enhanced and the deterioration of the liquid in the bottle by oxygen and water vapor can be prevented without the need of using a multilayer preform, a preform including blended material, or the like as the preform 10a. Such material can be PE (polyethylene), PP (polypropylene), MXD-6 (nylon) or EVOH (ethylene vinyl alcohol copolymer), for example. It is also possible to mix an oxygen absorbent (e.g., fatty acid salt) with one or more of these materials.
The inner label member 60a may also be made of material having a ray barrier property against ultraviolet rays, etc. In this case, the ray barrier property of the composite container 10A can be enhanced and the deterioration of the liquid in the bottle by ultraviolet rays, etc. can be prevented without the need of using a multilayer preform, a preform including blended material, or the like as the preform 10a. Such material can be blended material or material made by adding light blocking resin to PET, PE or PP.
The inner label member 60a may also be made of material having a higher warm keeping property or cool keeping property (i.e., lower thermal conductivity) than the plastic material forming the container body 10 (preform 10a). In this case, the conduction of the temperature of the liquid in the composite container 10A to the surface of the composite container 10A can be reduced without the need of increasing the thickness of the container body 10 itself. Consequently, the warm keeping property or cool keeping property of the composite container 10A is enhanced. Such material can be foamed polyurethane, polystyrene, PE (polyethylene), PP (polypropylene), phenolic resin, polyvinyl chloride, urea resin, silicone, polyimide, melamine resin, etc.
On the other hand, the plastic member 40a is attached to the outer surface of the inner label member 60a without using an adhesive, in such close contact that the plastic member 40a does not move or rotate with respect to the preform 10a. The plastic member 40a is arranged in the entire range in regard to the circumferential direction of the preform 10a to surround the preform 10a and to have a substantially circular horizontal section.
In this case, the inner label member 60a and the plastic member 40a are formed to cover the most of the trunk part 20a, excluding the part 13a corresponding to the neck part 13 of the container body 10, and to totally cover the bottom part 30a.
Incidentally, the inner label member 60a and the plastic member 40a may also be formed on part or all of the surface of the preform 10a other than the mouth part 11a. For example, the inner label member 60a and the plastic member 40a may be formed to cover the preform 10a excluding the mouth part 11a, that is, to totally cover the trunk part 20a and the bottom part 30a. Each of the inner label member 60a and the plastic member 40a may either be formed as one member or two or more members. For example, two inner label members 60a (two plastic members 40a) may be arranged respectively on different parts of the outer surface of the trunk part 20a.
Such a plastic member 40a may either be a member not having or having the function of contracting with respect to the preform 10a.
In the latter case, materials having the function of contracting with respect to the preform 10a can be used for the plastic member (outer contractive member) 40a. For the plastic member (outer contractive member) 40a, it is desirable to use a member that contracts (e.g., heat shrinkage) with respect to the preform 10a when an external effect (e.g., heat) is exerted thereon.
The rest of the configuration of the preform 10a and the plastic member 40a is substantially equivalent to that in the above-described first embodiment, and thus detailed explanation thereof is omitted here.
Next, the shape of the plastic member 40a and/or the inner label member 60a will be described below.
As shown in
As shown in
As shown in
Next, the blow molding method (manufacturing method of the composite container 10A) according to this embodiment will be explained below with reference to
First, the preform 10a made of plastic material is prepared (see
Subsequently, the inner label member 60a is arranged outside the preform 10a and the plastic member 40a is arranged outside the inner label member 60a, by which the composite preform 70 including the preform 10a, the inner label member 60a in close contact with the outer surface of the preform 10a and the plastic member 40a in close contact with the outer surface of the inner label member 60a is made (see
In this case, the inner label member 60a and the plastic member 40a may be set in close contact with the outer surface of the preform 10a by preparing the inner label member 60a and the plastic member 40a as members having inner diameters equal to or slightly smaller than the outer diameter of the preform 10a and pressing and sliding the inner label member 60a and the plastic member 40a onto the preform 10a. Alternatively, the inner label member 60a and the plastic member. 40a may be set in close contact with the outer surface of the preform 10a also by preparing the inner label member 60a and the plastic member 40a as members having heat shrinkability, arranging the inner label member 60a and the plastic member 40a on the outer surface of the preform 10a, and heating the inner label member 60a and the plastic member 40a at 50° C. to 100° C. to cause the heat shrinkage.
It is possible to previously arrange the plastic member 40a around the inner label member 60a and thereafter attach the inner label member 60a and the plastic member 40a integrally to the outer surface of the preform 10a. It is also possible to first arrange the inner label member 60a outside the preform 10a and thereafter arrange the plastic member 40a outside the inner label member 60a.
With this method previously making the composite preform 70 by setting the plastic member 40a in close contact with the outer surface of the inner label member 60a and the preform 10a as above, it becomes possible to carry out the sequence of steps for making the composite preform 70 (
Subsequently, the composite preform 70 is heated by a heating device 51 (see
Subsequently, the composite preform 70 heated by the heating device 51 is fed to a blow molding die 50. The composite container 10A is formed (molded) by using the blow molding die 50. Similarly to the above-described first embodiment, the composite container 10A, including the container body 10, the inner label member 60 arranged on the outer surface of the container body 10 and the plastic member 40 arranged on the outer surface of the inner label member 60, is obtained (see
The rest of the blow molding method (manufacturing method of the composite container 10A) according to this embodiment is substantially equivalent to that in the above-described first embodiment, and thus detailed explanation thereof is omitted here.
Modification of Blow Molding Method
Next, a modification of the blow molding method (manufacturing method of the composite container 10A) according to this embodiment will be described below with reference to
First, the preform 10a made of plastic material is prepared (see
Subsequently, the inner label member 60 is arranged outside the preform 10a, and the plastic member (outer contractive member) 40a is arranged outside the inner label member 60 (see
In this case, it is possible to previously arrange the plastic member (outer contractive member) 40a around the inner label member 60 and thereafter attach the inner label member 60 and the plastic member (outer contractive member) 40a integrally to the outer surface of the preform 10a. It is also possible to first arrange the inner label member 60 outside the preform 10a and thereafter arrange the plastic member (outer contractive member) 40a outside the inner label member 60.
Subsequently, the preform 10a, the inner label member 60 and the plastic member (outer contractive member) 40a are heated by a heating device 51 (see
The plastic member (outer contractive member) 40a heated as above contracts (heat shrinkage) and is set in close contact with the outer surface of the preform 10a (see
Subsequently, the preform 10a, the inner label member 60 and the plastic member (outer contractive member) 40a heated by the heating device 51 are fed to a blow molding die 50 (see
The preform 10a, the inner label member 60 and the plastic member (outer contractive member) 40a are formed (molded) by using the blow molding die 50. Similarly to the above-described example of
Next, another modification of the blow molding method (manufacturing method of the composite container 10A) according to this embodiment will be described below with reference to
First, the preform 10a made of plastic material is prepared (see
Subsequently, the inner label member 60 is arranged outside the preform 10a, and the plastic member (outer contractive member) 40a is arranged outside the inner label member 60 (see
In this case, it is possible to previously arrange the plastic member (outer contractive member) 40a around the inner label member 60 and thereafter attach the inner label member 60 and the plastic member (outer contractive member) 40a integrally to the outer surface of the preform 10a. Alternatively, it is also possible to first arrange the inner label member 60 outside the preform 10a and thereafter arrange the plastic member (outer contractive member) 40a outside the inner label member 60.
Subsequently, the preform 10a, the inner label member 60 and the plastic member (outer contractive member) 40a are heated by a first heating device 55 (see
The heated plastic member (outer contractive member) 40a contracts (heat shrinkage) and is set in close contact with the outer surface of the preform 10a, by which the composite preform 70, including the preform 10a, the inner label member 60 in close contact with the outer surface of the preform 10a and the plastic member (outer contractive member) 40a in close contact with the outer surface of the inner label member 60, is obtained (see
With this method previously making the composite preform 70 by heating the plastic member (outer contractive member) 40a by use of the first heating device 55 and setting the plastic member 40a in close contact with the outer surface of the inner label member 60 and the preform 10a as above, it becomes possible to carry out the sequence of steps for making the composite preform 70 (
Subsequently, the composite preform 70 is heated by a second heating device 51 (see
Subsequently, the composite preform 70 heated by the second heating device 51 is fed to a blow molding die 50 (see
The composite preform 70 is formed (molded) by using the blow molding die 50. Similarly to the above-described example of
As described above, according to this embodiment, the composite container 10A including the container body 10, the inner label member 60 and the plastic member 40 is made by integrally inflating the preform 10a, the inner label member 60a and the plastic member 40a of the composite preform 70 through the blow molding of the composite preform 70 in the blow molding die 50. Accordingly, the composite container 10A can be provided with the inner label member 60 at the stage when the composite container 10A is made by using the preform 10a. Therefore, the process for adding a label to the container by use of a labeler after the composite container 10A is filled with the liquid and capped tightly is unnecessary. Consequently, the manufacturing cost for the manufacture of the end products can be reduced.
Further, the manufacturing yield in the manufacture of the end products can be prevented from being dropped by malfunction of the labeler or the like.
Furthermore, according to this embodiment, the preform 10a (container body 10) and the plastic member 40a (plastic member 40) can be formed of different members (materials). Therefore, various functions and characteristics can be given to the composite container 10A in a flexible manner by properly selecting the type and shape of the plastic member 40.
Moreover, according to this embodiment, there arises no need for preparing new molding equipment for the manufacture of the composite containers 10A since a standard type of blow molding apparatus can directly be used for the manufacture of the composite containers 10A.
Next, a modification according to the present invention will be described below with reference to
In the modification shown in
In the composite container 10A shown in
The rest of the configuration in
Besides, the rest of the configuration and the manufacturing method of the composite container 10A and the rest of the configuration and the manufacturing method of the composite preform 70 are substantially equivalent to those in the embodiment shown in
| Number | Date | Country | Kind |
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| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2014/067230 | 6/27/2014 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2014/208746 | 12/31/2014 | WO | A |
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