Sintering device for blanks of foamable plastics with undercuts

Details Sintering device for blanks of foamable plastics with undercuts Sintering device for blanks of foamable plastics with undercuts

1988-04-28

1990-04-10

Housel, James C.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Including both heating and cooling means

249 79, 249116, 249135, 249141, 249152, 249180, 249184, 425817R, 425DIG58, B29C 3304

Patent

active

049156098

ABSTRACT:
A sintering device includes separable mould walls which together define a mould cavity and a mould core which is positioned within the cavity to define an undercut mould surface. The core includes a hollow frusto-pyramidal central support formed with guideways and a plurality of core segments mounted for slidable movement within the guideways whereby the core is radially expandable and contractable. The segments include a plurality of arc-surface segments alternating with trapezoidal segments. The mould walls and the core include passages for introducing steam and air into the cavity. The passages of the core place the hollow interior of the central support in communication with the mould cavity.

REFERENCES:
patent: 3712778 (1973-01-01), Lidl
patent: 3946981 (1976-03-01), Frank
patent: 4130264 (1978-12-01), Schroer
patent: 4362291 (1982-12-01), Fuke et al.
patent: 4533312 (1985-08-01), Von Holdt
patent: 4541605 (1985-09-01), Kubota et al.
patent: 4546951 (1985-10-01), Boschman
patent: 4731014 (1988-03-01), Von Holdt
patent: 4813859 (1989-03-01), Bullard et al.

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