US4897233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making reinforced material
Assignee: Bayer AG
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Filing: 1988-04-14
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Granted: 1990-01-30
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Expires: 2008-04-14
Abstract
Abstract The invention relates to a fibre-reinforced thermoplastic semi-finished product includes a thermoplastically processible polymer and long individual reinforcing fibres which form a coherent skeleton, which product can be processed in stamping presses to give moulded articles having a very high surface quality and very good physical properties, and a process for producing this product.
Inventors
- 👤 Peter Bier
- 👤 Karl-dieter Loehr
- 👤 Dieter Titze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:48
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/12; B29B; B29B11/00; B29B11/06; B29B11/10; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/52; B29C48/625; B29C48/76; B29C48/765; B29C48/766; B29C70/02; B29C70/021; B29C70/025; B29C48/03; B29C48/05; B29K; B29K2105/00; B29K2105/06; B29K2105/12; B29K2105/16; B29K2705/00; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
Process for the production of materials containing filling elements sensitive to shearing forces comprising the steps of adding the filling elements to an at least kneadable plastic in the first section of a screw machine, operating all subsequent screw sections of the machine with a high degree of filling (ε=1) with a kinematic operating parameter Λ, which indicates the ratio of the quantity q conveyed through a filled screw section at a prevailing operating state to the maximum quantity q max to be conveyed through the screw at a back pressure of Δp=0, of greater than Λ max.
Claim 2
Dependent Claim
98 words
Process for the production of materials containing filling elements sensitive to shearing forces comprising the steps of adding the filling elements to an at least kneadable plastic in the first section of a screw machine, operating all subsequent screw sections of the machine with a high degree of filling (ε=1) with a kinematic operating parameter Λ, which indicates the ratio of the quantity q conveyed through a filled screw section at a prevailing operating state to the maximum quantity q max to be conveyed through the screw at a back pressure of Δp=0, of greater than Λ max.
Claim 3
Dependent Claim
37 words
Process according to claim 1, characterised in that the screw sections are operated with a kinematic operating parameter of Λ≧1/3 after the addition of filling elements consisting of hollow balls and/or individual fibres to a thermoplastic material.
Claim 4
Dependent Claim
37 words
Process according to claim 1, characterised in that the screw sections following the addition of filling elements consisting of metal platelets and/or individual fibres to a thermoplastic material, are operated with a kinematic operating parameter of Λ≧1/3.
Claim 5
Dependent Claim
18 words
Process according to claim 1 including utilizing a conveying apparatus for transportation at the end of the screw.
Claim 6
Dependent Claim
26 words
Process according to claim 1, including the further step of introducing at least one reinforcing filling element into the composition after the end of the screw.
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) | 1993-01-29 | 1993-07-31 | 1994-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-29 | 1997-07-31 | 1998-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-29 | 2001-07-31 | 2002-01-30 | $7700.00 | Window Closed / Lapsed |