EP0148763A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Moulded fibre reinforced plastics articles
Assignee: Wiggins Teape Group Ltd
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Filing: 1985-01-03
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Granted: —
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Expires: 2005-01-03
Abstract
Abstract A process for moulding articles of fibre reinforced plastics material which includes heating and moulding a sheet of consolidated thermoplastics material which has dispersed therein from 20 to 70% by weight of reinforcing fibres which have a high modulus of elasticity (as herein defined) and between about 7 and about 50 millimetres long so that the stresses embodied in the glass fibres cause the matrix to expand into the configuration of the mould and become porous.
Inventors
- 👤 Bronislaw Radvan
- 👤 William Terence Haley Skelding
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 23:11
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/28; B29C70/40; B29C70/42; B29C70/46; B29C67/00; B29C67/20; B29C70/06; B29C70/08; B29C70/10; B29C70/12; B29C70/54; B29C70/56; D; D21; D21H; D21H13/00; D21H13/36; D21H13/38; D21H13/40; B29K; B29K2105/00; B29K2105/04; B29K2105/06; B29K2105/12; B29K2995/00; B29K2995/0037; B29K2995/0046; B29K2995/0068; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/24995; Y10T428/249952; Y10T428/249953; Y10T428/249962; Y10T428/249964
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
A process for moulding articles of fibre reinforced plastics material which includes heating and moulding a sheet of consolidated thermoplastics material which has dispersed therein from 20% to 70% by weight of reinforcing fibres which have a high modulus of elasticity (as herein defined) and between about 7 and about 50 millimetres long so that the stresses embodied in the glass fibres cause the matrix to expand into the configuration of the mould and become porous.
Claim 2
Dependent Claim
76 words
A process for moulding articles of fibre reinforced plastics material which includes heating and moulding a sheet of consolidated thermoplastics material which has dispersed therein from 20% to 70% by weight of reinforcing fibres which have a high modulus of elasticity (as herein defined) and between about 7 and about 50 millimetres long so that the stresses embodied in the glass fibres cause the matrix to expand into the configuration of the mould and become porous.
Claim 3
Dependent Claim
39 words
A process as claimed in claim 1 in which the degree of expansion is controlled by setting the dimensions of the forming tool mould to clearances less than the final thickness which would be achieved by free unrestricted expansion.
Claim 4
Dependent Claim
23 words
A process as claimed in claim 1 or claim 2 in which the thermoplastics material has at least 30% by weight glass fibres.
Claim 5
Dependent Claim
18 words
A process as claimed in claim 3 in which the thermoplastics material has 50% by weight glass fibres.
Claim 6
Dependent Claim
34 words
A process as claimed in claims 1 to 4 in which the sheet is formed of two or more layers of plastics material of different compositions which are laminated together in the moulding process.
Claim 7
Dependent Claim
31 words
A process as claimed in claim 5 in which three or more layers are incorporated the outer layers having a lower fibre content by weight than the inner layer or layers.
Claim 8
Dependent Claim
70 words
A process as claimed in claims 1 to 6 in which the sheet is heated in an oven and then transferred to a mould having at least two parts, pressure is applied to the sheet in the mould and then released and at least two or the mould parts are separated to allow the fibre content of the moulded article to recover and expand the moulding to render it porous.
Claim 9
Dependent Claim
24 words
A process as claimed in claim 7 in which the mould parts are again closed after the moulding has expanded to partly consolidate it.
Claim 10
Dependent Claim
21 words
A process for moulding articles of fibre reinforced plastics material as set forth in any one of Examples 1 to 31.
Claim 11
Dependent Claim
21 words
A process for moulding articles of fibre reinforced plastics material as set forth in any one of Examples 1 to 31.
Claim 12
Dependent Claim
24 words
A process for moulding articles of fibre reinforced plastics material substantially as described herein with reference to and as shown in the accompanying drawings.
Claim 13
Dependent Claim
24 words
A process for moulding articles of fibre reinforced plastics material substantially as described herein with reference to and as shown in the accompanying drawings.
Claim 14
Dependent Claim
24 words
An article of moulded fibre reinforced plastics material made by the process set forth in any one of the preceding claims 1 to 8.
References Cited (Backward Citations)
No citation records indexed.
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