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US4876052A
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US
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Method of extruding and compression molding a multilayered article
Assignee: Toyo Seikan Group Holdings Ltd
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Filing: 1988-06-20
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Granted: 1989-10-24
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Expires: 2008-06-20
Abstract
Abstract A multilayer compression-molded article produced by compression-molding a composite plastic material. The composite plastic material comprises a first synthetic resin and a second synthetic resin in which the first synthetic resin surrounds substantially the entire second synthetic resin. The compression-molded article comprises a first resin layer molded from the first synthetic resin and a second resin layer molded from the second synthetic resin in which the first resin layer surrounds substantially the entire second resin layer. The composite plastic material is obtained by an extrusion apparatus which intermittently extrudes the second synthetic resin via a subsidiary extrusion flow passage into a main extrusion flow passage in which the first synthetic resin flows.
Inventors
- 👤 Muneki Yamada
- 👤 Kiyoshi Kawaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:49
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/32; B29C43/34; B29B; B29B11/00; B29B11/06; B29B11/10; B29B11/14; B29C43/02; B29C43/20; B29C43/203; B29C48/00; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/30; B29C48/304; B29C48/36; B29C48/49; B29C49/00; B29C49/071; B29D; B29D22/00; B29D22/003; B29C2043/3433; B29C2949/00; B29C2949/07; B29C2949/0715; B29C48/07; B29C48/12; B29K; B29K2995/00; B29K2995/0037; B29K2995/0065; B29K2995/0067; B29L; B29L2031/00; B29L2031/56; B29L2031/565; B29L2031/712; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/1383; Y10T428/31504; Y10T428/31507; Y10T428/31725; Y10T428/31736; Y10T428/31739; Y10T428/31743; Y10T428/31746; Y10T428/3175; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
200 words
A method for producing a compression-molded article having a multilayer structure comprising a first resin layer molded from a first synthetic resin and a second resin layer molded from a second synthetic resin and wherein the first and second resin layers are dissimilar and the first resin layer substantially surrounds the entire second resin layer, said method comprising the steps of: introducing the first synthetic resin into a main extrusion flow passage, permitting the first synthetic resin to flow in a heated, molten state in the main extrusion flow passage, intermittently extruding the second synthetic resin in a heated, molten state into the main extrusion flow passage to provide extruded second synthetic resin which is substantially surrounded, in the main extrusion flow passage, by the first synthetic resin, extruding the second synthetic resin and the first synthetic resin from an extrusion opening in the main extrusion flow passage to provide extruded second and first synthetic resins forming a composite plastic material comprising the second synthetic resin substantially surrounded by the first synthetic resin and, compression-molding the composite plastic material to mold the first resin layer from the first synthetic resin and the second resin layer from the second synthetic resin.
Claim 2
Independent Claim
200 words
A method for producing a compression-molded article having a multilayer structure comprising a first resin layer molded from a first synthetic resin and a second resin layer molded from a second synthetic resin and wherein the first and second resin layers are dissimilar and the first resin layer substantially surrounds the entire second resin layer, said method comprising the steps of: introducing the first synthetic resin into a main extrusion flow passage, permitting the first synthetic resin to flow in a heated, molten state in the main extrusion flow passage, intermittently extruding the second synthetic resin in a heated, molten state into the main extrusion flow passage to provide extruded second synthetic resin which is substantially surrounded, in the main extrusion flow passage, by the first synthetic resin, extruding the second synthetic resin and the first synthetic resin from an extrusion opening in the main extrusion flow passage to provide extruded second and first synthetic resins forming a composite plastic material comprising the second synthetic resin substantially surrounded by the first synthetic resin and, compression-molding the composite plastic material to mold the first resin layer from the first synthetic resin and the second resin layer from the second synthetic resin.
Claim 3
Dependent Claim
62 words
The method of claim 1 comprising the steps of: introducing the second synthetic resin into the main extrusion flow passage through an extrusion opening means in a subsidiary extrusion flow passage which is disposed within the main extrusion flow passage, and selectively opening and closing the extrusion opening means to intermittently extrude the second synthetic resin into the main extrusion flow passage.
Claim 4
Dependent Claim
35 words
The method of claim 1 comprising the step of: cutting through only the first synthetic resin of the extruded second and first synthetic resins to obtain the composite plastic material from the main flow passage.
Claim 5
Dependent Claim
32 words
The method of claim 1 wherein the first synthetic resin is an olefinic resin, and the second synthetic resin is anethylene/vinyl alcohol copolymer resin, nylon 6/6.6 copolymer or a finylidene choloride-type resin.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein the compression-molded article having a multilayer structure is a container closure, a container closure liner or a container.
Claim 7
Dependent Claim
30 words
The method of claim 1 wherein the first synthetic resin is an olefinic resin, a styrene-type resin, an acrylic resin, a methacrylic resin, a polyester-type resin or a polycarbonate resin.
Claim 8
Dependent Claim
34 words
The method of claim 6 wherein the second synthetic resin is an olefin/vinyl alcohol copolymer, a polyamide resin, a high-barrier polyester-type resin, a nitrile-type resin, a vinyl chloride-type resin or a vinylidene chloride-type resin.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |