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US5108530A
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Method of producing a deep-drawn formed plastic piece
Assignee: Bayer AG
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Filing: 1989-12-01
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Granted: 1992-04-28
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Expires: 2009-12-01
Abstract
Abstract A method of manufacturing a deep-drawn formed plastic piece comprises providing a cold-stretchable sheet material with a coating selected from a group of an ink film, an ink imprint, a vacuum evaporated metallic thin film, and an electrically conductive varnish film. The coated sheet is heated with a fluid pressure medium which has a fluid medium pressure of more than 20 bars, and at an operating temperature lower than the softening temperature of the sheet material, in order to deform the sheet material isostatically to obtain the deep-drawn formed coated plastic piece.
Inventors
- 👤 Curt Niebling, Jr.
- 👤 Joachim Wank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:03
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; B29C45/1418; B29C51/00; B29C51/10; B29C51/14; B29C67/00; B29C67/0029; B60; B60K; B60K37/00; B60K37/20; B29C70/00; B29C70/68; B29C70/78; B29L; B29L2031/00; B29L2031/30; B29L2031/3005; B29L2031/3008; B29L2031/722; B29L2031/747; F; F21; F21W; F21W2111/00
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
94 words
A method of manufacturing a deep-drawn formed plastic piece comprising the steps of: providing a cold-stretchable sheet material with a coating selected from the group of an ink film, an ink imprint, a vacuum evaporated metallic thin film, and an electrically conductive varnish film; and treating said coated sheet with a fluid pressure medium having a fluid medium pressure of more than 20 bars, and at an operating temperature lower than the softening temperature of the sheet material, to deform the sheet material isostatically in order to obtain the deep-drawn formed coated plastic piece.
Claim 2
Independent Claim
94 words
A method of manufacturing a deep-drawn formed plastic piece comprising the steps of: providing a cold-stretchable sheet material with a coating selected from the group of an ink film, an ink imprint, a vacuum evaporated metallic thin film, and an electrically conductive varnish film; and treating said coated sheet with a fluid pressure medium having a fluid medium pressure of more than 20 bars, and at an operating temperature lower than the softening temperature of the sheet material, to deform the sheet material isostatically in order to obtain the deep-drawn formed coated plastic piece.
Claim 3
Dependent Claim
24 words
A method according to claim 1, wherein treating of the sheet material is conducted during a period of time of less than 5 seconds.
Claim 4
Dependent Claim
15 words
A method according to claim 1, wherein treating of the sheet material is conducted abruptly.
Claim 5
Dependent Claim
32 words
A method according to claim 1, wherein a dual-layer sheet material is formed in a single step, and wherein the coating is provided on an inner surface of the dual-layer sheet material.
Claim 6
Dependent Claim
20 words
A method according to claim 1, wherein the cold-stretchable sheet material has a thickness of between 40 and 2000 μm.
Claim 7
Dependent Claim
28 words
A method according to claim 1, wherein a cold-stretchable sheet material comprising plastic materials based on polycarbonates, polyamides, polyimides, polyesters, organic cellulose esters, polyarylates or polyfluorohydrocarbons is formed.
Claim 8
Dependent Claim
20 words
A method according to claim 1, wherein treating takes place against a resiliently supported wall portion of a mold cavity.
Claim 9
Dependent Claim
25 words
A method according to claim 1, wherein a thin-walled deep-drawn piece is obtained after forming and that piece is subsequently injection-reinforced with a plastic composition.
Claim 10
Dependent Claim
21 words
A method according to claim 1, wherein the operating temperature is above the glass transition temperature of the coated sheet material.
Claim 11
Dependent Claim
19 words
A method according to claim 9, wherein the operating temperature is above the softening temperature of the coating material.
Claim 12
Dependent Claim
15 words
A method according to claim 10, wherein treating of the sheet material is conducted abruptly.
Claim 13
Dependent Claim
16 words
A method according to claim 1, wherein the operating temperature is between 80° and 130° C.
Claim 14
Dependent Claim
17 words
A method according to claim 12, wherein the fluid medium pressure is between 50 and 300 bars.
Claim 15
Dependent Claim
20 words
A method according to claim 13, wherein the cold-stretchable sheet material has a thickness of between 40 and 2000 μm.
Claim 16
Dependent Claim
20 words
A method according to claim 13, wherein treating takes place against a resiliently supported wall portion of a mold cavity.
Claim 17
Independent Claim
90 words
A method of manufacturing a deep-drawn formed plastic piece, comprising: providing a cold-stretchable substantially flat sheet material with a coating, with at least a portion of said coating forming a graphic representation; and applying a fluid pressure medium to said coated cold-stretchable sheet material at an operating temperature below the softening temperature of the sheet material and at a fluid medium pressure of more than 20 bars whereby deforming the sheet material isostatically in order to obtain said deep-drawn formed plastic piece without any significant distortion to said graphic representation.
Claim 18
Independent Claim
90 words
A method of manufacturing a deep-drawn formed plastic piece, comprising: providing a cold-stretchable substantially flat sheet material with a coating, with at least a portion of said coating forming a graphic representation; and applying a fluid pressure medium to said coated cold-stretchable sheet material at an operating temperature below the softening temperature of the sheet material and at a fluid medium pressure of more than 20 bars whereby deforming the sheet material isostatically in order to obtain said deep-drawn formed plastic piece without any significant distortion to said graphic representation.
Claim 19
Dependent Claim
17 words
A method according to claim 16, wherein the fluid medium pressure is between 60 and 250 bars.
Claim 20
Dependent Claim
22 words
A method according to claim 16, wherein treating of the sheet material is conducted during a period of less than 2 seconds.
Claim 21
Dependent Claim
20 words
A method according to claim 16, wherein treating takes place against a resiliently supported wall portion of a mold cavity.
Claim 22
Dependent Claim
36 words
A method according to claim 16, wherein coating is selected from one of the following group of coatings, an ink film, an ink imprint, a vacuum evaporated metallic thin film and an electrically conductive varnish film.
References Cited (Backward Citations)
US1857034A
Cited
US4931325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-28 | 1995-10-28 | 1996-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-28 | 1999-10-28 | 2000-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-28 | 2003-10-28 | 2004-04-28 | $7700.00 | Window Closed / Lapsed |