US4649004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of multi-layer pipes for draw-forming
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1984-12-26
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Granted: 1987-03-10
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Expires: 2004-12-26
Abstract
Abstract A process for the production of a multi-layer pipe to be used for formation of a bottle by drawblow-forming, comprising forming by co-extrusion a pipe having inner and outer layers of a polyester composed mainly of ethylene terephthalate units and an intermediate layer of an oxygen-barrier resin interposed between the inner and outer layers. An adhesive resin layer is preferable interposed between every two adjacent layers. The co-extruded multi-layer pipe is sized in the molten state so that the diameter of the pipe is uniform. The process continues by cooling the outer portion of the molten multi-layer pipe by contact with water and simultaneously introducing an inert gas or an inert gas containing a water mist into the interior of the pipe to thereby cool the inner portion of the pipe and prevent oxidation in the pipe. A multi-layer pipe prepared according to this process is excellent in the transparency and the draw-formability into a multi-layer drawn bottle.
Inventors
- 👤 Shigezo Nohara
- 👤 Takeshi Sugimoto
- 👤 Kozaburo Sakano
- 👤 Yoshimichi Ohkubo
- 👤 Junichi Matsuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:34
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/32; B29C48/335; B29C48/336; B29C48/3366; B29C48/88; B29C48/90; B29C48/908; B29C48/91; B29C48/911; B29C48/9115; B29C48/919; B29C49/00; B29C49/02; B29C49/04; B29C49/071; B29C49/22; B29D; B29D22/00; B29D22/003; B29D23/00; B32; B32B; B32B1/00; B32B1/08; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/306; B32B27/36; B29C2949/00; B29C2949/07; B29C2949/072; B29C2949/0722; B29C2949/0723; B29C2949/0724; B29C2949/073; B29C2949/0731; B29C2949/0732; B29C2949/0733; B29C2949/076; B29C2949/0768; B29C2949/077; B29C2949/0772; B29C2949/0773; B29C2949/0777; B29C2949/078; B29C2949/081; B29C2949/0811; B29C2949/082; B29C2949/0861; B29C2949/0862; B29C2949/0872; B29C2949/30; B29C2949/3008; B29C2949/3012; B29C2949/3016; B29C2949/302; B29C2949/3024; B29C2949/3026; B29C2949/3028; B29C2949/303; B29C2949/3032; B29C2949/3034; B29C2949/3036; B29C2949/3038; B29C2949/3041; B29C2949/3042; B29C2949/3044; B29C2949/3046; B29C2949/3086; B29C2949/3088; B29C2949/3092; B29K; B29K2067/00; B29K2995/00; B29K2995/0037; B29K2995/0068; B29K2995/0069; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; B32B2310/00; B32B2310/04; B32B2310/0445; B32B2310/0463; B32B2310/0472; B32B2367/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/31504; Y10T428/31786; Y10T428/31797
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
153 words
A process for the production of a multi-layer pipe to be used for formation of a bottle by draw-blow-forming, which comprises forming by co-extrusion a pipe comprising inner and outer layers of polyester composed mainly of ethylene terephtahalate units and an intermediate layer of oxygen-barrier resin interposed between the inner and outer layers, if necessary with an adhesive resin layer interposed between every two adjacent layers, sizing the co-extruded multi-layer pipe in the molten state so that the diameter of the pipe is uniform, and cooling the outer portion of the molten multi-layer pipe by contact with water and simultaneously introducing an inert gas containing a water mist into the interior of the pipe to thereby cool the inner portion of the pipe and prevent oxidation in the pipe without crystallization, thereby forming a solidified pipe wherein both of the outer portion and the inner portion thereof are maintained in an amorphous state.
Claim 2
Dependent Claim
153 words
A process for the production of a multi-layer pipe to be used for formation of a bottle by draw-blow-forming, which comprises forming by co-extrusion a pipe comprising inner and outer layers of polyester composed mainly of ethylene terephtahalate units and an intermediate layer of oxygen-barrier resin interposed between the inner and outer layers, if necessary with an adhesive resin layer interposed between every two adjacent layers, sizing the co-extruded multi-layer pipe in the molten state so that the diameter of the pipe is uniform, and cooling the outer portion of the molten multi-layer pipe by contact with water and simultaneously introducing an inert gas containing a water mist into the interior of the pipe to thereby cool the inner portion of the pipe and prevent oxidation in the pipe without crystallization, thereby forming a solidified pipe wherein both of the outer portion and the inner portion thereof are maintained in an amorphous state.
Claim 3
Dependent Claim
36 words
A process according to claim 1, wherein the coextrusion is carried out so that the thickness ratio of the inner polyester layer to the outer polyester layer is within a range of from 1/1.1 to 1/5.
Claim 4
Dependent Claim
15 words
A process according to claim 1, wherein the oxygen-barrier resin is in ethylene/vinyl alcohol copolymer.
Claim 5
Dependent Claim
31 words
A process according to claim 3, wherein the ethylene/vinyl alcohol copolymer is one having an ethylene content of 15 to 50 mole % and a saponification degree of at least 96%.
Claim 6
Dependent Claim
14 words
A process according to claim 1, wherein the inert gas is a nitrogen gas.
Claim 7
Dependent Claim
28 words
A process according to claim 1, wherein the thickness ratio of the polyester layer to the oxygen-barrier resin layer is within a range of from 2/1 to 30/1.
Claim 8
Dependent Claim
225 words
A process for the preparation of a multi-layer polyester vessel which comprises forming by co-extrusion of pipe comprising inner and outer layers of a polyester composed mainly of ethylene terephtahalate units and an intermediate layer of an oxygen-barrier resin interposed between the inner and outer layers, if necessary with an adhesive resin layer interposed between every two adjacent layers, sizing the co-extruded multi-layer pipe in the molten state so that the diameter of the pipe is uniform, cooling the outer portion of the molten multi-layer pipe by contact with water and simultaneously introducing an inert gas containing a water mist into the interior of the pipe to thereby cool the inner portion of the pipe and prevent oxidation in the pipe without crystallization, thereby forming a solidified pipe wherein both of the outer portion and the inner portion thereof are maintained in an amorphous state, cutting the solidified pipe into a predetermined size, forming a closed bottom on one end of the cut pipe and a portion to be engaged with a lid member on the other end of the cut pipe, preliminarily heating the so-formed preform at a drawing temperature of 85° to 120° C., and stretching and drawing the preliminarily heated bottomed preform in the axial direction and simultaneously expanding and drawing the preform in the circumferential direction by blowing of a fluid.
Claim 9
Dependent Claim
225 words
A process for the preparation of a multi-layer polyester vessel which comprises forming by co-extrusion of pipe comprising inner and outer layers of a polyester composed mainly of ethylene terephtahalate units and an intermediate layer of an oxygen-barrier resin interposed between the inner and outer layers, if necessary with an adhesive resin layer interposed between every two adjacent layers, sizing the co-extruded multi-layer pipe in the molten state so that the diameter of the pipe is uniform, cooling the outer portion of the molten multi-layer pipe by contact with water and simultaneously introducing an inert gas containing a water mist into the interior of the pipe to thereby cool the inner portion of the pipe and prevent oxidation in the pipe without crystallization, thereby forming a solidified pipe wherein both of the outer portion and the inner portion thereof are maintained in an amorphous state, cutting the solidified pipe into a predetermined size, forming a closed bottom on one end of the cut pipe and a portion to be engaged with a lid member on the other end of the cut pipe, preliminarily heating the so-formed preform at a drawing temperature of 85° to 120° C., and stretching and drawing the preliminarily heated bottomed preform in the axial direction and simultaneously expanding and drawing the preform in the circumferential direction by blowing of a fluid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |