Method of manufacture of reinforced sheet plastics material and

Details Method of manufacture of reinforced sheet plastics material and Method of manufacture of reinforced sheet plastics material and

1980-08-19

1983-11-08

Weston, Caleb

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

156242, 15624411, 156245, 428411, 428430, B32B 2736

Patent

active

044142668

ABSTRACT:
Polyethylene terephthalate (PET) sheet material incorporating fibrous reinforcement, e.g. 20 to 60% glass fibre, is holding superimposing layers of reinforcement and molten PET in contact under pressure and then cooling the layers to below the glass transition temperature of PET at a rate sufficient to avoid crystallization of the PET. The resulting sheet material contains PET in its amorphous phase and can be moulded to form articles such as motor vehicle body panels by heating the sheet in a mould to a temperature above its glass transition temperature but below its melting point and holding the sheet at that temperature until the PET undergoes crystallization.

REFERENCES:
patent: 3765998 (1973-10-01), Oswald et al.
patent: 4263364 (1981-04-01), Seymour et al.
patent: 4269884 (1981-05-01), Della Vecchia et al.

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