Method and apparatus for rotational molding with evacuated guard

Details Method and apparatus for rotational molding with evacuated guard Method and apparatus for rotational molding with evacuated guard

1976-07-07

1978-08-29

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Shaping against interior of a forming surface by rotation of...

264102, 264126, 264310, 425429, 425812, 264526, 264573, B29C 504, B29D 2308

Patent

active

041103890

ABSTRACT:
The apparatus comprises a double walled mould interior divided into two halves, a heat exchange exterior hollow envelope and a pressure-exchange compartment within the envelope surrounding the adjacent abutting surfaces of the rims of the two mould halves, heat-exchanges and pressure-exchanges producing means to rotate the apparatus on two axes, means to introduce a protective gas into the mould to avoid combustion of vapors and optional means cooperating between the heat-exchange and pressure-exchange means in the heating and cooling phases.
The method includes controls of pressure and heat-exchange steps during the heating and cooling stages to avoid formation of bubbles, deformities and combustions, particularly when transparent plastic materials difficult to mould are used.

REFERENCES:
patent: 2441097 (1948-05-01), Hicks
patent: 3351983 (1967-11-01), Grigull
patent: 3473192 (1969-10-01), Martelli
patent: 3514508 (1970-05-01), Schott et al.
patent: 3683062 (1972-08-01), Von Der Heide
patent: 3692457 (1972-09-01), Pekor
patent: 3773454 (1973-11-01), Horve et al.

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