# US 10,870,245 B2 · Preform extrusion molding apparatus, method for extrusion molding, and preform

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- Number: US 10,870,245 B2
- Document ID: US10870245B2
- Status: Granted
- Kind: B2
- Application number: 16/558,381
- Filed: 2019-09-03
- Published: 2019-12-19
- Granted: 2020-12-22
- Earliest claimed: 2011-11-17
- Assignees: Yoshino Kogyosho Co., Ltd.
- Applicants: Junichi Chiba; Kazuhiko Shimizu; Hiroshi Hosokoshiyama
- Inventors: Junichi Chiba; Kazuhiko Shimizu; Hiroshi Hosokoshiyama
- Web page: https://patentgrep.com/patent/US10870245B2

## CPC

- B29D 22/00: Producing hollow articles (tubular articles B29D23/00; pneumatic tyres B29D30/00)
- B29B 11/08: Injection moulding
- B29C 45/1603: {Multi-way nozzles specially adapted therefor}
- B29C 45/1646: {Injecting parison-like articles (B29C45/1643 takes precedence)}
- B29C 49/12: Stretching rods
- B29C 49/22: using multilayered preforms or parisons
- B65D 23/02: Linings or internal coatings
- B29C 45/77: of velocity or pressure of moulding material
- B29C 49/06: Injection blow-moulding
- B29C 2045/1648: {the parison core layer being a barrier material}
- B29C 2049/023: {using inherent heat of the preform, i.e. 1 step blow moulding}
- B29C 2945/76568: Position
- B29C 2945/76755: nozzles
- B29C 2949/0715: the preform having one end closed
- B29C 2949/0773: Threads
- B29C 2949/0777: Tamper-evident band retaining ring
- B29C 2949/0778: characterised by the flange
- B29C 2949/3009: partially
- B29C 2949/3012: at flange portion
- B29C 2949/3016: at body portion
- B29C 2949/302: at bottom portion
- B29C 2949/3022: partially
- B29K 2105/258: {Tubular}
- B29L 2009/00: Layered products
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- 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
- 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 (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- 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
- 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
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

A process includes: supplying a main resin from outer and inner flow channel, to a joined flow channel at a predetermined supply velocity for a predetermined time; supplying a second resin from a middle flow channel to the joined flow channel simultaneously with the main resin at a predetermined supply velocity for a certain time within the predetermined time; and sliding a shut-off pin to bring the pin forefront to a predetermined position near an outlet of the inner flow channel, open to the joined flow channel, before the second resin is supplied, or during a time starting after a time from the start of the second resin supply and ending with the termination of the supply, so that the velocity of main resin supply from the inner flow channel to the joined flow channel is reduced to a predetermined level by adjusting the degree of aperture for the outlet.

## Claims

### Claim 1

A preform in a test tube shape for biaxial stretching and blow molding use, in which a second-resin layer serving as an intermediate layer is laminated with main-resin layers that make up a shape of the preform,
wherein a trailing edge of the second-resin layer is located (1) within a range from outside of an outer peripheral edge of a circular gate vestige formed in a center of a bottom plate of a bottom of the preform to a lower end of a corresponding inner peripheral surface of a body of the preform, and (2) at a distance of an average of 5 mm from the center of the bottom plate of the bottom of the preform, and
wherein the second-resin layer is located closer to the inner peripheral surface of the preform than to the outer peripheral surface of the preform.