US5424020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing molded article of fiber-reinforced thermoplastic resin
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1993-06-23
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Granted: 1995-06-13
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Expires: 2013-06-23
Abstract
Abstract A method for producing a molded article of a fiber-reinforced thermoplastic resin, which includes supplying a melt mass of a thermoplastic resin which is reinforced with fibers dispersed therein and having an average fiber length of not shorter than 1 mm and not longer than 50 mm as a reinforcing material in an unclosed mold in which a film or sheet made of a thermoplastic resin having adhesiveness to a thermoplastic resin is optionally placed, closing the mold and pressurizing and cooling it to obtain a molded article.
Inventors
- 👤 Takahisa Hara
- 👤 Masahito Matsumoto
- 👤 Nobuhiro Usui
- 👤 Shigeyoshi Matubara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:16
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/68; B29C70/78; B29C43/00; B29C43/02; B29C43/18; B29C43/183; B29C43/184; B29C43/20; B29C43/203; B29C43/206; B29C43/32; B29C43/34; B29C45/00; B29C45/0005; B29C45/17; B29C45/46; B29C45/56; B29C45/561; B29C48/00; B29C48/03; B29C48/07; B29C48/12; B29C48/25; B29C48/285; B29C48/288; B29C48/2886; B29C48/36; B29C48/375; B29C48/388; B29K; B29K2105/00; B29K2105/06; B29K2105/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
212 words
A method for producing a molded article of a fiber-reinforced thermoplastic resin, which comprises the steps of: (a) feeding a raw thermoplastic resin material into a first feed opening of a plasticator which has a ratio of screw length to screw diameter of at least 15 and comprises a second feed opening for supplying fibers at a center of a cylinder and an exhaust vent on a nozzle side; (b) heating said raw thermoplastic resin material fed in step (a) in said plasticator until said raw thermoplastic resin material is molten; (c) introducing fibers in said second feed opening of said plasticator downstream of said step (a); (d) removing entrained air from the mixture of said thermoplastic resin and said fibers downstream of said second feed opening; (e) uniformly kneading said fibers in said molten resin; (f) extruding said molten thermoplastic resin containing dispersed fibers having an average length of from 1 mm to 50 mm as a reinforcing material into an accumulator; (g) supplying said molten fiber-reinforced thermoplastic resin from said accumulator in an unclosed mold; (h) closing said mold during or after the supply of said molten fiber-reinforced thermoplastic resin; and (i) pressurizing and cooling said fiber-reinforced thermoplastic resin in said mold and removing a molded article from said mold.
Claim 2
Independent Claim
212 words
A method for producing a molded article of a fiber-reinforced thermoplastic resin, which comprises the steps of: (a) feeding a raw thermoplastic resin material into a first feed opening of a plasticator which has a ratio of screw length to screw diameter of at least 15 and comprises a second feed opening for supplying fibers at a center of a cylinder and an exhaust vent on a nozzle side; (b) heating said raw thermoplastic resin material fed in step (a) in said plasticator until said raw thermoplastic resin material is molten; (c) introducing fibers in said second feed opening of said plasticator downstream of said step (a); (d) removing entrained air from the mixture of said thermoplastic resin and said fibers downstream of said second feed opening; (e) uniformly kneading said fibers in said molten resin; (f) extruding said molten thermoplastic resin containing dispersed fibers having an average length of from 1 mm to 50 mm as a reinforcing material into an accumulator; (g) supplying said molten fiber-reinforced thermoplastic resin from said accumulator in an unclosed mold; (h) closing said mold during or after the supply of said molten fiber-reinforced thermoplastic resin; and (i) pressurizing and cooling said fiber-reinforced thermoplastic resin in said mold and removing a molded article from said mold.
Claim 3
Dependent Claim
31 words
The method according to claim 1, wherein the fiber reinforced thermoplastic resin has a mold shrinkage factor of 10/1000 or less and a flexural modulus of 24,000 kg/cm 2 or larger.
Claim 4
Dependent Claim
22 words
The method according to claim 1, wherein a pressure for supplying the resin melt is from 100 to 300 kg/cm 2 .
Claim 5
Dependent Claim
19 words
The method according to claim 1, wherein a mold clamping pressure is from 30 to 150 kg/cm 2 .
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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) | 1998-06-12 | 1998-12-12 | 1999-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-06-12 | 2002-12-12 | 2003-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-06-12 | 2006-12-12 | 2007-06-13 | $7700.00 | Window Closed / Lapsed |