US20160185488A1 - Synthetic resin container with window, preform, and method of injection molding preform - Google Patents

Synthetic resin container with window, preform, and method of injection molding preform Download PDF

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Publication number
US20160185488A1
US20160185488A1 US14/900,700 US201414900700A US2016185488A1 US 20160185488 A1 US20160185488 A1 US 20160185488A1 US 201414900700 A US201414900700 A US 201414900700A US 2016185488 A1 US2016185488 A1 US 2016185488A1
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US
United States
Prior art keywords
intermediate layer
flow path
resin
preform
laminated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/900,700
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English (en)
Inventor
Hiroshi Hosokoshiyama
Junichi Chiba
Seiji ISO
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yoshino Kogyosho Co Ltd
Original Assignee
Yoshino Kogyosho Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yoshino Kogyosho Co Ltd filed Critical Yoshino Kogyosho Co Ltd
Assigned to YOSHINO KOGYOSHO CO., LTD. reassignment YOSHINO KOGYOSHO CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHIBA, JUNICHI, HOSOKOSHIYAMA, HIROSHI, ISO, Seiji
Publication of US20160185488A1 publication Critical patent/US20160185488A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/54—Inspection openings or windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/06—Making preforms by moulding the material
    • B29B11/08—Injection moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00—Making preforms
    • B29B11/14—Making preforms characterised by structure or composition
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0046—Details relating to the filling pattern or flow paths or flow characteristics of moulding material in the mould cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1603—Multi-way nozzles specially adapted therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1603—Multi-way nozzles specially adapted therefor
    • B29C45/1607—Multi-way nozzles specially adapted therefor having at least three different ways
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/164—The moulding materials being injected simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • B29C45/1646—Injecting parison-like articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/071—Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/02—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
    • B65D1/0215—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features multilayered
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1603—Multi-way nozzles specially adapted therefor
    • B29C2045/1614—Multi-way nozzles specially adapted therefor side-by-side flow of materials in the same channel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/07—Preforms or parisons characterised by their configuration
    • B29C2949/0715—Preforms or parisons characterised by their configuration the preform having one end closed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3006—Preforms or parisons made of several components having tangentially different components within one layer, e.g. longitudinal stripes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3008—Preforms or parisons made of several components at neck portion
    • B29C2949/3009—Preforms or parisons made of several components at neck portion partially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3012—Preforms or parisons made of several components at flange portion
    • B29C2949/3014—Preforms or parisons made of several components at flange portion partially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3016—Preforms or parisons made of several components at body portion
    • B29C2949/3018—Preforms or parisons made of several components at body portion partially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/302—Preforms or parisons made of several components at bottom portion
    • B29C2949/3022—Preforms or parisons made of several components at bottom portion partially
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3032—Preforms or parisons made of several components having components being injected
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00—Indexing scheme relating to blow-moulding
    • B29C2949/30—Preforms or parisons made of several components
    • B29C2949/3032—Preforms or parisons made of several components having components being injected
    • B29C2949/3034—Preforms or parisons made of several components having components being injected having two or more components being injected
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/28—Closure devices therefor
    • B29C45/2806—Closure devices therefor consisting of needle valve systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B29K2067/003—PET, i.e. poylethylene terephthalate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/258—Tubular
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/0026—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7158—Bottles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/60—Bottles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2203/00—Decoration means, markings, information elements, contents indicators
    • B65D2203/04—Level indicators

Definitions

  • the disclosure relates to a synthetic resin container with a window made by biaxial stretch blow molding, which has a transparent or semitransparent window section through which residual quantity of contents can be observed from outside.
  • the disclosure also relates to a test tube-shaped preform being a precursor of the container and a method of injection molding the preform.
  • Blow molded containers made of synthetic resin have been conventionally used primarily for containing, for example, beverages, food, detergents, cosmetics, and medicine. They are in many cases given a light-blocking property to protect the contents from ultraviolet rays or the like, or configured such that the contents thereof becomes invisible to improve the appearance and design qualities.
  • Giving a light-blocking property or making the contents invisible from outside has been achieved for example by making the container itself opaque using a colored resin, by coating the outer surface of the container opaque, or by overcoating the outer surface of the container with an opaque shrink film or a shrink film having an opaque printing thereon.
  • a transparent or semitransparent container with a window section may be used.
  • the window section is formed by partially masking the container and then, after painting, removing the mask, or when a shrink film is used by leaving a part of the film transparent without putting any printing thereon. These permit observation of the residual quantity of the contents from outside.
  • JP2005153901A (PTL 1) describes a blow molded container made by direct blow molding.
  • the container has a longitudinal strip-shaped window section made of a transparent resin formed in the circumferential wall made of a colored resin.
  • the window section completely interrupts the circumferential wall.
  • This container is formed by extrusion molding a cylindrical parison 131 , which is a precursor, as shown in FIG. 12 .
  • the parison 131 is blow molded such that an uncolored transparent resin Rtr is flown, in the direction of extrusion, into a part of a cylindrical flow path of a dies used for the extrusion molding, through which a colored resin Rcol flows; and a circumferential wall composed of the colored resin Rcol is completely interrupted circumferentially by the transparent resin Rtr extruded as a longitudinal strip.
  • a longitudinal strip-shaped, transparent window section can be formed relatively easily in this container.
  • the containers made by direct blow molding can be provided with a longitudinal strip-shaped, transparent window section relatively easily.
  • the containers such as bottles obtained by biaxial stretch blow molding, or specifically containers obtained by subjecting test tube-shaped preforms made by injection molding to biaxial stretch blow molding, which are made for example of polyethylene terephthalate (hereinafter “PET”) resin, would have the following problem and the like if longitudinal strip-shaped, transparent window sections are formed in the same manner as the window section of the containers made by direct blow molding.
  • PET polyethylene terephthalate
  • the test tube-shaped preform is injection molded in the following manner.
  • an uncolored transparent resin Rtr is flown, in the direction of extrusion, into a part of a cylindrical flow path where a colored resin Rcol flows, thereby forming a laminated molten resin having a cylindrical shape with a laminated structure such as the one shown in FIG. 13A , where a circumferential wall formed of the colored resin Rcol is completely interrupted circumferentially by the transparent resin Rtr; and the cylindrical laminated molten resin is formed into a columnar shape having the laminated structure shown in FIG. 13B at the tip of the nozzle, thereby being injected and flown into a test tube-shaped cavity 4 through a gate 5 to fill the cavity 4 , as shown in FIG. 13C .
  • a part of the colored resin Rcol may enters into the inner circumferential surface side of the transparent resin Rtr as shown in FIG. 13C .
  • This may cause a part of the colored resin Rcol to be mixed into the inner circumferential surface side of the window section to thereby cause the above-mentioned problems such as spoiling of the appearance of the window section, which may further make a part of the window section opaque.
  • the above-described containers with a window made by direct blow molding or by biaxial stretch blow molding are each provided with a longitudinal strip-shaped section formed of a transparent resin that penetrates a circumferential wall formed of a colored resin.
  • the transparent, longitudinal strip-shaped section serves as a longitudinal strip-shaped window section of the container.
  • Most of the inner surface of the circumferential wall is thus formed of the colored resin, causing the contents accommodated by the container to directly contact the colored resin. This may result in a problem of quality change or the like in the contents depending on the type of contents or the type of pigment or filler dispersed for coloring or imparting light-blocking property.
  • the disclosure herein is intended to solve to the above-described problems, such as spoiling of appearance of the window section and the quality change or the like in the contents, associated with the synthetic resin container with a window made by biaxial stretch blow molding.
  • An object thereof is to provide a container made by biaxial stretch blow molding, which has a longitudinal strip-shaped, transparent window section clearly formed.
  • the disclosure relates to a synthetic resin container with a window made by biaxial stretch blow molding, a test tube-shaped preform being a precursor of the container, and a method of injection molding the preform.
  • a synthetic resin container with a window made by biaxial stretch blow molding a test tube-shaped preform being a precursor of the container
  • a method of injection molding the preform.
  • the descriptions will be made in the order of the preform, the container with a window, and the method of injection molding.
  • the features of the preform will be first described.
  • the preform with those features can be molded by the below-described injection molding method of the disclosure.
  • the preform disclosed herein is a test tube-shaped preform for biaxial stretch blow molding made by injection molding.
  • the main features of the preform include a transparent base layer; a circumferential wall formed of the transparent base layer; a light-blocking or opaque intermediate layer formed in the base layer in a laminated manner over an area of a predetermined height of the circumferential wall.
  • the intermediate layer is formed in a laminated manner over an area covering an entire circumference of the circumferential wall excluding a non-laminated section, where the intermediate layer is not formed, that extends in a shape of a longitudinal strip along a central axis direction on the circumferential wall of the preform.
  • the container with a window made by biaxial stretch blow molding described with reference to with FIG. 13 above has a longitudinal strip-shaped section formed of a transparent resin that penetrates a circumferential wall formed of a colored resin.
  • the transparent, longitudinal strip-shaped section serves as a longitudinal strip-shaped window section of the container.
  • the above-described test tube-shaped preform has a circumference wall having a laminated structure obtained by forming an opaque intermediate layer in a transparent base layer in a laminated manner. More specifically, the laminated structure is composed of the base layer, the intermediate layer, and the base layer arranged in this order from outside to inside.
  • a non-laminated section, where the intermediate layer is not formed, that extends in a shape of a longitudinal strip is also provided. This transparent non-laminated section serves as a longitudinal strip-shaped window section of the container made by biaxial stretch blow molding.
  • the transparent base layer herein also includes a colored, transparent base layer and a semitransparent base layer, in addition to the uncolored, transparent base layer.
  • a columnar laminated molten resin formed at a tip of a nozzle provided in an injection molding apparatus is injected or flown through a gate into a cavity having a test tube shape, maintaining the laminated structure of “base layer/intermediate layer/base layer”, as described in detail later with reference to the molding method of the disclosure.
  • the intermediate layer is formed in a laminated manner to cover a range of substantially a total height.
  • the intermediate layer may not be formed near an upper end surface of a mouth tube or over a bottom wall of a bottom. To cover such cases, this feature has been defined to recite “a range of substantially a total height”.
  • Still another feature of the disclosed preform is that, in the above main features, the intermediate layer is formed in a laminated manner over an entire area near the bottom that at least includes the bottom wall.
  • the intermediate layer may be formed in a laminated manner over a range of a total height as above, or may be formed over a range of a height excluding for example the mouth tube, the bottom, or the like.
  • the laminated range of the intermediate layer in the preform can be selected in accordance with the intended use of the container. According to the below-described molding method, the intermediate layer may be formed in a laminated manner over an entire area near the bottom that includes the bottom wall as described above.
  • the range to be covered by the non-laminated section formed within the range of the height where the intermediate layer is formed in a laminated manner can be also selected, as the laminated range of the intermediate layer in the preform, in accordance with the intended use of the container, such as light-blocking effect and the like.
  • the container with those features can be made by subjecting the above-described preform to biaxial stretch blow molding.
  • the container with a window disclosed herein is a synthetic resin container or bottle with a window made by subjecting a test tube-shaped preform being a precursor made by injection molding to biaxial stretch blow molding.
  • the main features of the container include a transparent base layer; a circumferential wall formed of the base layer; and
  • the intermediate layer is formed in a laminated manner over an area covering an entire circumference of the circumferential wall excluding a non-laminated section, where the intermediate layer is not formed, that extends in a shape of a longitudinal strip along a central axis direction of the container on the circumferential wall of the container, and the non-laminated section serves as a window section.
  • the container with a window having the above features has a longitudinal strip-shaped, transparent window section clearly formed by biaxial stretch blow molding, as previously described with reference to the preform.
  • the intermediate layer can be formed in a laminated manner over substantially an entire area of the circumferential wall of the container excluding the window section, and a major material resin may be for example a PET resin and an intermediate layer resin may be for example an ethylene vinyl alcohol copolymer (EVOH) resin or an MX nylon resin with high gas barrier performance, which are colored.
  • a major material resin may be for example a PET resin
  • an intermediate layer resin may be for example an ethylene vinyl alcohol copolymer (EVOH) resin or an MX nylon resin with high gas barrier performance, which are colored.
  • the above-mentioned resins such as an EVOH resin and an MX nylon resin may reduce their performance when the contents are composed principally of water.
  • the use of a PET resin or a polyolefinic resin for the base resin allows the use of this type of resin, which exhibits poor resistance to contents, as the intermediate layer without problems.
  • an intermediate layer composed of such resins being colored allows the container to exert light-blocking effect and functions such as gas barrier performance.
  • the intermediate layer is formed in the base layer in a laminated manner to provide a laminated structure of sandwich arrangement. This prevents the contents from directly contacting the intermediate layer in which pigment or filler is dispersed. Therefore, the problems such as quality change or the like in the contents can be also overcome.
  • the intermediate layer is formed in a laminated manner to cover a range of substantially a total height. This allows light-blocking effect to be sufficiently exerted.
  • Still another feature of the disclosed container with a window is that, in the above main features, the intermediate layer is formed in a laminated manner over an entire area near a bottom that at least includes a bottom wall.
  • the base layer is made of an uncolored PET resin and the intermediate layer is made of a colored, opaque PET resin.
  • the method is an injection molding method of the above-described test tube-shaped preform for biaxial stretch blow molding, in which an intermediate layer is formed in a base layer in a laminated manner.
  • the method is performed with a use of an injection molding apparatus including a nozzle, the nozzle comprising:
  • the three cylindrical flow paths for layer formation disposed concentrically about the same axis, the three cylindrical flow paths including an inner flow path and an outer flow path for forming the base layer composed of a major material resin, and a middle flow path for forming the intermediate layer composed of an intermediate layer resin, the middle flow path being disposed between the inner flow path and the outer flow path;
  • a columnar combined flow path disposed downstream from the three cylindrical flow paths for layer formation, at the columnar combined flow path, the three flow paths being combined;
  • shut-off longitudinal rib piece disposed at a downstream end of the middle flow path, the shut-off longitudinal rib piece traversing the middle flow path relative to the circumferential direction and circumferentially interrupting the middle flow path, the method comprising:
  • the columnar laminated molten resin being composed of the major material resin and the intermediate layer resin formed in the major material resin in a laminated manner that are combined into a columnar shape at the combined flow path, and the gate being disposed at a position in the cavity that corresponds to a center of a bottom wall of a bottom of a preform;
  • Another feature of the disclosed method of injection molding the preform includes, in the above main features, configuring the injection molding apparatus to be used such that an opening end of the inner flow path into the combined flow path is shut off or released and further such that an opening degree of the opening end is adjusted, by controlling the position of a tip of a columnar shut-off pin that is slidably inserted into or disposed in a space inward of the inner flow path;
  • shutting off the opening end by controlling the position of the tip of the shut-off pin, during the period from when a predetermined time has passed after the supply of the intermediate layer resin is started to at least when the supply of the intermediate layer resin is finished;
  • the intermediate layer in a laminated manner over an entire area near the bottom of the preform that at least includes the bottom wall.
  • the disclosed preform has a circumferential wall with a laminated structure obtained by forming an opaque intermediate layer in a transparent base layer in a laminated manner. More specifically, the laminated structure is composed of the base layer, the intermediate layer, and the base layer arranged in this order from outside to inside. A non-laminated section, where the intermediate layer is not formed, that extends in a shape of a longitudinal strip is also provided. This transparent non-laminated section serves as a longitudinal strip-shaped window section of the container made by biaxial stretch blow molding. With these features, a colored resin will not be mixed into a portion of a transparent window section to spoil the appearance of the window section, or a part of the window section will not be made opaque. It becomes thus possible to provide a container made by biaxial stretch blow molding which has a transparent, clear window section.
  • the intermediate layer is formed in the base layer in a laminated layer to provide a laminated structure of sandwich arrangement. This prevents the contents from directly contacting the intermediate layer in which pigment or filler is dispersed. Therefore, the problems such as quality change or the like in the contents can be also overcome.
  • FIG. 1 is a perspective view illustrating one example of a container with a window according to the disclosure
  • FIG. 2 is a plane cross-sectional view taken along the line A-A of the container of FIG. 1 ;
  • FIG. 3 is a perspective view illustrating one example of a preform according to the disclosure.
  • FIG. 4A is a side view of the preform of FIG. 3 with a part thereof being cut longitudinally
  • FIG. 4B is a plane cross-sectional view taken along the line B-B of FIG. 4A
  • FIG. 4C is a bottom view
  • FIG. 5A is a side view of another example of a preform according to the disclosure, with a part thereof being cut longitudinally,
  • FIG. 5B is a plane cross-sectional view taken along the line C-C of FIG. 5A , and
  • FIG. 5C is a bottom view;
  • FIG. 6 schematically illustrates an example of an injection molding apparatus used for injection molding according to the disclosure, with essential part thereof being cut longitudinally;
  • FIG. 7 illustrates movement positions of a shut-off pin in the apparatus of FIG. 6 ;
  • FIG. 8A is a side view of a first mandrel forming a middle flow path of a nozzle shown in FIG. 6
  • FIG. 8B is a bottom view
  • FIG. 8C is a perspective view seen from below obliquely;
  • FIG. 9 illustrates an example of injection patterns used in an injection molding method according to the disclosure.
  • FIGS. 10A and 10B schematically illustrate a filling process of a metal mold cavity with a molten resin, demonstrated in accordance with one of the injection patterns shown in FIG. 9 ;
  • FIGS. 11A, 11B, and 11C schematically illustrate a filling process of a metal mold cavity with a molten resin, demonstrated in accordance with another injection pattern shown in FIG. 9 ;
  • FIGS. 12A and 12B schematically illustrate an extrusion process of a parison performed in direct blow molding
  • FIGS. 13A, 13B, and 13C schematically illustrate an example of a conventional filling process of a metal mold cavity with a laminated molten resin.
  • FIGS. 1 and 2 illustrate one example of a container with a window of the disclosure, where FIG. 1 is an overall perspective view and FIG. 2 is a plane cross-sectional view taken along the line A-A of FIG. 1 .
  • This container 201 is a bottle of PET resin, which is made by subjecting a test tube-shaped preform 101 , which will be described below, to biaxial stretch blow molding.
  • the container 201 includes a mouth tube 202 , a tapered-tube shoulder 204 , a cylindrical body 205 , and a bottom 206 .
  • the mouth tube 202 has a circumferential neck ring 203 .
  • the body 205 has a diameter of 55 mm and a total height of 190 mm.
  • the circumferential wall of the container 201 has a laminated structure composed of three layers. Specifically, an intermediate layer 212 is formed in a base layer 211 in a laminated manner to cover a range of substantially a total height, excluding an upper edge of the mouth tube 202 and a bottom wall 206 w of the bottom 206 .
  • the base layer 211 is made of a major material resin Ra, which is an uncolored PET resin forming the entire circumferential wall
  • the intermediate layer 212 is made of an intermediate layer resin Rb which is a white-colored PET resin.
  • the circumferential wall has a laminated structure composed of a base layer 211 a , the intermediate layer 212 , and a base layer 211 b arranged in this order from the outer surface to the inner surface as shown in FIG. 2 .
  • the base layer 211 is shown such that it is separated into the base layer 211 a , positioned on the outer surface side, and the base layer 211 b , positioned on the inner surface side.
  • the circumferential wall has, on its side surface, a longitudinal strip-shaped non-laminated section 213 , where the longitudinal intermediate layer 212 is not formed, or specifically the circumferential wall consists exclusively of the base layer 211 .
  • the longitudinal strip-shaped non-laminated section 213 serves as a window section 213 w through which the inside of the container 201 can be observed to permit monitoring of the residual quantity of the liquid inside.
  • the intermediate layer 212 functions as a light-blocking layer.
  • the plane cross-sectional view of FIG. 2 shows a laminate arrangement composed of the base layer 211 and the intermediate layer 212 formed in the base layer 211 .
  • the resins Ra and Rb apparently do not mix with each other, allowing the boundary of the window section 213 w to exhibit clear and good appearance.
  • the part on the circumference wall of the container 201 or a preform 101 that displays white-colored appearance given by the intermediate layer is painted pale black as necessary.
  • FIGS. 3 and 4 show one example of a preform of the disclosure.
  • This preform 101 is a precursor of the container 201 shown in FIGS. 1 and 2 .
  • FIG. 3 is an overall perspective view
  • FIG. 4A is a side view, with a portion of the preform being cut out longitudinally
  • FIG. 4B is a plane cross-sectional view taken along the line B-B of FIG. 4A
  • FIG. 4C is a bottom view.
  • the preform 101 has a test tube shape made by injection molding a PET resin.
  • the preform has a mouth tube 102 , a cylindrical boy 105 , a bottom 106 , wherein the mouth tube 102 has a circumferential neck ring 103 .
  • the circumferential wall of the preform 101 has a laminated structure composed of three layers. Specifically, an intermediate layer 112 is formed in a base layer 111 in a laminated manner to cover a range of substantially a total height, excluding an upper edge of the mouth tube 102 and a bottom wall 106 w of the bottom 106 .
  • the base layer 111 is made of a major material resin Ra, which is an uncolored PET resin forming the entire circumferential wall
  • the intermediate layer 112 is made of an intermediate layer resin Rb, which is a white-colored PET resin.
  • the circumferential wall has a laminated structure composed of a base layer 111 a , the intermediate layer 112 , and a base layer 111 b arranged in this order from the outer surface to the inner circumference surface as shown in FIG. 4B .
  • the circumferential wall has, on its side surface, a longitudinal strip-shaped non-laminated section 113 , where the longitudinal intermediate layer 112 is not formed, or specifically the circumferential wall consists exclusively of the base layer 111 .
  • the bottom wall 106 w of the bottom 106 is not provided with the intermediate layer 112 , so that the bottom wall 106 w is transparent.
  • the plane cross-sectional view of FIG. 4B shows a laminate arrangement composed of the base layer 111 and the intermediate layer 112 formed in the base layer 111 .
  • the resins Ra and Rb apparently do not mix with each other, allowing the boundary to be clearly formed.
  • FIG. 5 shows another example of a preform of the disclosure.
  • FIG. 5A is a side view, with a portion of the preform being cut longitudinally
  • FIG. 5B is a plane cross-sectional view taken along the line C-C of FIG. 5A
  • FIG. 5C is a bottom view.
  • This preform 101 is generally similar to the preform 101 of FIG. 4 except that the intermediate layer 112 is formed in a laminated manner over the entire area of the bottom wall 106 w of the bottom 106 and thus the non-laminated area 113 is extended to the lower end of the body 105 .
  • the bottom wall 206 w When the preform 101 is formed into the bottle-shaped container 201 by biaxial stretch blow molding, the bottom wall 206 w will be also provided with the intermediate layer 212 formed in a laminated manner, thereby allowing the bottom wall 206 w to exhibit white, opaque appearance.
  • FIGS. 6, 7, and 8 schematically show one example of an injection molding apparatus used in the injection molding method of the disclosure.
  • FIG. 6 is a longitudinal cross-sectional view of an area near a nozzle 11 , with a metal mold 1 being installed downstream.
  • FIG. 7 is a diagram for illustrating the position of a tip 20 p of a shut-off pin 20 in the apparatus of FIG. 6 .
  • FIG. 8A is a side view of a first mandrel forming a middle flow path 15 b of the nozzle 11
  • FIG. 8B is a bottom view
  • FIG. 8C is a perspective view seen from below obliquely.
  • the nozzle 11 has a cylindrical first, second, and third mandrels 21 , 22 , and 23 , which are arranged about the same central axis in the above order from the inner side.
  • a columnar shut-off pin 20 is slidably inserted into or disposed in the space inward of the first mandrel 21 .
  • each mandrel has a tapered tube shape with the diameter being reduced toward downstream.
  • the third mandrel 23 and the second mandrel 22 define therebetween a cylindrical outer flow path 15 a through which the major material resin Ra flows; the second mandrel 22 and the first mandrel 21 define therebetween a cylindrical middle flow path 15 b through which a second resin Rb flows; and the first mandrel 21 and the shut-off pin 20 define therebetween a cylindrical inner flow path 15 c through which the major material resin Ra flows similarly to the outer flow path 15 a.
  • a shut-off rib piece 16 R that traverses the middle flow path 15 b is provided such that the middle flow path 15 b is circumferentially interrupted.
  • FIG. 8 shows the shape of the first mandrel 21 serving as the inner circumferential wall of the middle flow path 15 b .
  • a groove flow path manifold 14 b is disposed in a bilaterally symmetric manner, which distributes a molten resin to a cylindrical flow path from an inlet 13 b for the molten intermediate layer resin Rb.
  • the shut-off longitudinal rib piece 16 R is disposed at a tapered portion, which is the downstream end, in the circumferential direction opposite the inlet 13 b.
  • the major material resin Ra is supplied from a first supplier Sa, such as a screw extruder or an accumulator with a plunger attached to a tip of an extruder, and through a lead-in path 12 a and via a manifold 14 a 1 and a manifold 14 a 2 , the major material resin Ra is guided into the outer flow path 15 a and the inner flow path 15 c.
  • a first supplier Sa such as a screw extruder or an accumulator with a plunger attached to a tip of an extruder
  • the intermediate layer resin Rb is supplied from a second supplier Sb, and through a lead-in path 12 b and via the manifold 14 b , the intermediate layer resin Rb is guided into the middle flow path 15 b.
  • the major material resin Ra is supplied to a columnar combined flow path 19 from a reduced-diameter flow path 15 as disposed at the tip of the outer flow path 15 a and a reduced-diameter flow path 15 cs disposed at the tip of the inner flow path 15 c , and
  • the second resin Rb is supplied to the columnar combined flow path 19 from a reduced-diameter flow path 15 bs disposed at the tip of the middle flow path 15 b .
  • the major material resin Ra and the second resin Rb are combined to form a columnar laminated molten resin.
  • the laminated molten resin is injected into a cavity 4 formed of a cavity metal mold and a core metal mold of the metal mold 1 through a gate 5 to fill the cavity 4 .
  • the gate 5 is disposed at the position in the cavity 4 that corresponds to the center of the bottom wall 106 w of the bottom 106 of the preform 101 .
  • the intermediate layer resin Rb formed into a cylindrical layer within the middle flow path 15 b is circumferentially interrupted by the shut-off longitudinal rib piece 16 R disposed at the downstream end.
  • the intermediate layer resin Rb is incorporated into the major material resin Ra in a laminated manner, with a longitudinal strip-shaped slit being formed by the division. Into this slit part, the major material resin Ra flows. In this way, a longitudinal strip-shaped non-laminated section 113 without the intermediate layer is formed on the circumferential wall of the above-described preform 101 .
  • the shut-off pin 20 is configured to slide along the inner circumferential surface of the reduced-diameter tip of the first mandrel 21 that defines the inner flow path 15 c together with the shut-off pin 20 .
  • the shut-off pin 20 not only demonstrates a common function of shutting off or releasing the tip of the nozzle 11 , but also demonstrates a function of adjusting the supply amount of the major material resin Ra to the combined flow path 19 from the inner flow path 15 c .
  • the latter function is enabled by controlling the tip 20 p such that the position thereof is set to a predetermined position near an end 17 c which opens into the combined flow path 19 of the inner flow path 15 c to thereby adjust the opening degree of the opening end 17 c between a fully open state and a shut-off state.
  • FIG. 7 is a diagram illustrating the position of the tip 20 p of the shut-off pin 20 in the apparatus of FIG. 6 .
  • the position P 0 corresponds to the tip of the nozzle 11
  • the position P 3 corresponds to the upstream end of the reduced-diameter flow path 15 cs
  • the position P 2 corresponds to the area near the bottom end of the reduced-diameter flow path 15 cs
  • the position P 1 corresponds to the lower end of the inner flow path 15 c.
  • the opening degree of the opening end 17 c enters into a fully open state; when the tip 20 p is at set the position P 2 , it enters into a half open state, and when the tip 20 p is set at the position P 1 , it enters into a shut-off state.
  • the opening degree of the opening end 17 c can be adjusted between the fully open state to the shut-off state, which allows for the adjustment of the supply amount of the major material resin Ra to the combined flow path 19 from the inner flow path 15 c.
  • FIG. 9 schematically illustrates injection patterns demonstrated for injection molding the preform 101 shown in FIG. 3, 4 , or 5 , using the injection molding apparatus shown in FIGS. 6 to 8 .
  • the horizontal axis indicates time, and the vertical axis indicates supplying rate of the molten resin.
  • the injection pattern of the major material resin Ra is shown by a solid line and that of the intermediate layer resin Rb is shown by a dashed line.
  • These injection patterns basically corresponds to the injection patterns of what is called simultaneous injection molding, in which the major material resin Ra is supplied from the outer flow path 15 a and the inner flow path 15 c to the combined flow path 19 for a predetermined time period at a predetermined supplying rate Va, and for a certain period of time within a range of the predetermined time period during which the major material resin Ra is supplied, the intermediate layer resin Rb is simultaneously supplied from the middle flow path 15 b to the combined flow path 19 at a predetermined supplying rate.
  • FIG. 9 also shows control patterns of the position of the tip 20 p of two kinds of shut-off pin 20 , in combination with the above injection patterns of the molten resins.
  • the preform 101 shown in FIGS. 3 and 4 is molded by combining the above-described injection patterns of the major material resin Ra and the intermediate layer resin Rb and the control pattern Sp 1 indicated by a two-dot chain line.
  • the preform 101 shown in FIG. 5 is molded by combining the above-described injection patterns and the control pattern Sp 2 indicated by a single-dot chain line.
  • the control pattern Sp 1 of the shut-off pin 20 indicated in FIG. 9 is a pattern in which the tip 20 p is fixed at the position P 3 shown in FIG. 7 over the entire time period to allow the opening end 17 c of the inner flow path 15 c to be in the fully open state.
  • the injection molding process along the time course for this pattern is described below:
  • FIG. 10 schematically illustrates a filling process of the cavity 4 of the metal mold 1 with the major material resin Ra and the intermediate layer resin Rb in the above-described process.
  • FIG. 10A shows a state observed between the time tb 1 to the time tb 2 in FIG. 9
  • FIG. 10B shows a state observed at the time Ta 3 .
  • FIGS. 10A and 10B each have on the right side a cross-sectional view of the columnar laminated molten resin at the gate 5 , taken along the line K 1 -K 1 and the line K 2 -K 2 , respectively.
  • the major material resin Ra is separately shown by denoting the major material resin supplied from the outer flow path 15 a as “Ra 1 ”, and the major material resin supplied from the inner flow path 15 c as “Ra 2 ”.
  • the position where the longitudinal strip-shaped non-laminated section 113 is formed is shown by a single-dot chain line, and the area where the intermediate layer 112 is formed in a laminated manner is painted pale black.
  • the flow path of the intermediate layer resin Rb is interrupted, at the gate 5 , by the shut-off longitudinal rib piece 16 R provided in the middle flow path 15 b .
  • This causes a slit S to be formed and the intermediate layer resin Rb to indicate a C-letter shape in a laminated manner between the major material resins Ra 1 and Ra 2 .
  • a laminate arrangement shown in FIG. 10B is eventually obtained, providing the preform 101 that has the longitudinal strip-shaped non-laminated section 113 formed by the slit S as shown in FIG. 4 , where the bottom wall 106 w of the bottom 106 does not have the intermediate layer 112 therein.
  • control pattern Sp 2 of the shut-off pin 20 shown in FIG. 9 is a pattern where the tip 20 p is moved from the position P 3 to the position P 1 during the period between the time ts 1 and the time ts 2 to shut-off the opening end 17 c for that period.
  • FIG. 11 schematically illustrates a filling process of the cavity 4 of the metal mold 1 with the major material resin Ra and the intermediate layer resin Rb in the injection molding process demonstrated based on the control pattern Sp 2 .
  • FIG. 11A shows a state observed between the time tb 1 to the time ts 1 in FIG. 9
  • FIG. 11B shows a state observed between the time ts 2 to the time ta 2
  • the FIG. 11C shows a state observed at the time ta 3 .
  • FIGS. 11A and 11C each have on the right side a cross-sectional view of the columnar laminated molten resin at the gate 5 , taken along the line J 1 -J 1 and the line J 3 -J 3 , respectively, and FIG. 11B has on the right side cross-sectional views taken along the lines J 2 a -J 2 a and J 2 b -J 2 b.
  • the flow path of the intermediate layer resin Rb is interrupted, at the gate 5 , by the shut-off longitudinal rib piece 16 R provided in the middle flow path 15 b , as shown in the cross-sectional view on the right side.
  • This causes a slit S to be formed and the intermediate layer resin Rb to indicate a C-letter shape in a laminated manner between the major material resin layers Ra 1 and Ra 2 .
  • the position of the tip 20 p of the shut-off pin 20 is set to P 1 to shut off the supply of the major material resin Ra 2 from the inner flow path 15 c .
  • the intermediate layer resin Rb which has indicated the C-letter shape in FIG. 11A , collects about the center of the gate 5 as shown in the J 2 b -J 2 b cross section.
  • the slit S accordingly disappears and the intermediate layer resin Rb is formed in a laminated manner in the form of a thin columnar tail.
  • the position of the tip 20 p is returned to P 3 to resume supply of the major material resin Ra 2 from the inner flow path 15 c .
  • the predetermined pressure is kept from the time ta 2 to the time ta 3 .
  • the major material resin Ra is flown and subjected to pressure toward the cavity 4 from the gate 5 .
  • the intermediate layer 112 made of the intermediate layer resin Rb takes the laminate arrangement as shown in FIG. 11C .
  • the preform 101 is provided with the longitudinal strip-shaped non-laminated section 113 formed by the slit S as shown in FIG. 5 , which also allows the bottom wall 106 w of the bottom 106 to be provided with the intermediate layer 112 formed in a laminated manner.
  • Embodiments of the synthetic resin container with a window, the preform, and the injection molding apparatus of the preform have been described with reference to the examples. However, the disclosed products and method are not limited to the above examples.
  • the container in the above example has been described as a cylindrical bottle made of a PET resin, yet any other synthetic resin that can be subjected to biaxial stretch blow molding, such as polypropylene (PP) resin, can be used.
  • the shape of the container can also be any shape such as rectangular and the like.
  • the molecular weight or the like of the resins can be varied based on the flow behaviors of the resins.
  • the same type of resin is not necessarily used for major material resin and the intermediate layer resin.
  • the major material resin may be a PET resin and the intermediate layer resin may be an EVOH resin or an MX nylon resin with high gas barrier performance, which are colored.
  • the intermediate layer resin may be an EVOH resin or an MX nylon resin with high gas barrier performance, which are colored.
  • nearly the entire area of the circumferential wall excluding the window section can be provided with the intermediate layer formed in a laminated manner, which imparts This allows the container to exhibit both a window function and a high gas barrier function.
  • the window section 213 w may be formed over an extremely limited range of the body 205 by for example adjusting the time period during which the intermediate layer resin Rb is supplied based on the injection pattern shown in FIG. 9 .
  • the range of providing the window section 213 w can be appropriately selected in accordance with the intended use of the container.
  • the base layer 211 may be a colored transparent layer or a semitransparent layer.
  • the disclosed synthetic resin container with a window has a longitudinal strip-shaped, transparent window section clearly formed by biaxial stretch blow molding.
  • the container is expected to be widely used and developed in the field of light-blocking container or the like.

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JP2013136737A JP6061250B2 (ja) 2013-06-28 2013-06-28 合成樹脂製窓付き容器、プリフォーム及びプリフォームの射出成形方法
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WO2018017530A1 (en) * 2016-07-19 2018-01-25 Mylan Inc. View window medication packaging
CN113524495A (zh) * 2017-06-23 2021-10-22 赫斯基注塑系统有限公司 适合于随后吹塑成最终成形容器的模制品
WO2023285413A1 (en) * 2021-07-16 2023-01-19 Société des Produits Nestlé S.A. Bottle-forming preform with a multilayered wall, and gaseous beverage bottle obtained with such a preform

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US20230211925A1 (en) 2023-07-06
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