Vacuum moulding techniques

Details Vacuum moulding techniques Vacuum moulding techniques

1975-06-16

1976-06-22

Baldwin, Robert D.

Plastic article or earthenware shaping or treating: apparatus

Preform assembly means and means for bonding of plural...

Reshaping means utilizing fluid pressure directly contacting...

425387R, 425521, B29C 1704

Patent

active

039648567

ABSTRACT:
Apparatus and method for thermoforming two or more plastics sheets simultaneously, to form in one operation a double-walled cup, or a composite walled cup, or a plurality of single-walled cups. The sheets are moved and heated simultaneously, the portion not being thermoformed being kept apart, permitting economy of scrap remelting. The thermoformed portions can be kept apart by pressure between the sheets, which can serve to hotform the sheets against respective mould surfaces, or air pressure can bond the sheets together. Existing machines need substantially only an additional clamping plate, heater, and compressed air passing through a radial port in a clamping plate, to incorporate the invention.

REFERENCES:
patent: 3250660 (1966-05-01), Greig et al.
patent: 3338997 (1967-08-01), Tigner
patent: 3357053 (1967-12-01), Lyon et al.
patent: 3709967 (1973-01-01), Held

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