Method for molding reinforced polymeric articles
US4207282A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 1, 1978 |
| Grant date | Jun 10, 1980 |
| Priority date | — |
| Expiry date | Jun 1, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2260/046
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The formation of a composite formed by spreading a liquid thermosetting resin over a continuously moving plastic film or sheet is disclosed. Chopped fiber is added and a fabric or veil, such as a dacron polyester cloth, is continuously laid over the top to form a reinforced composite. This continuously produced thermosetting resin composite is rolled into a coil. After a maturation period, the plastic film or sheet may be removed from the SMC composite and sections of appropriate size and weight are cut from the coil and placed over the die of a compression molding machine, veil side down, up or both. The material is then compression molded at a pressure of 500-3000 p.s.i (35 to 210 kg. per sq. cm.) and a temperature of 100.degree.-165.degree. C., and cured into an article. In another embodiment, the fabric or veil may be first placed on one of the die elements, e.g., the bottom die. SMC is then placed over the fabric to make up the total charge. The charge is then compression molded under the conditions previously described. The fabric used has a grab break strength of at least 10 lbs. (4.5 kg.) in both longitudinal and transverse directions, and a tensile elongation of at least 1…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.