Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Female mold type means
Patent
1989-06-12
1990-11-06
Chiesa, Richard L.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Female mold type means
425468, 425542, B29C 4514
Patent
active
049682377
ABSTRACT:
Moulding tool (21), including an upper (22) and a lower (23) mound half, each with its recess, these recesses together forming a cavity (24) of the tool. The upper half (22) has a diaphragm (27) defining the cavity (24), on the rear side of which there is a space (31). Cores (25, 26) are fixed in the lower half (23), the ends (36) of theses cores engaging against the diaphragm (27). Raw material, e.g. plastics, is injected through a sprue (33) under high pressure into the cavity (24). Oil under pressure is pumped (34) through a duct (32) into the space (31) to keep the diaphragm (27) into engagement against the ends (36) of the cores. The plastics is thus prevented from penetrating between the ends (36) of the cores and the diaphragm (27), and friction forces between the diaphragm (27) and core (26) prevents the latter from being deflected laterally by the injected plastics. The manufactured products are free from flash, and disturbances in production and repair costs due to spoiled cores are small.
REFERENCES:
patent: 2575734 (1951-11-01), Schulman
patent: 2658237 (1953-11-01), Cuppett et al.
patent: 4330250 (1982-05-01), Pinkas
patent: 4658618 (1987-04-01), Hellgren
Chiesa Richard L.
Telefonaktiebolaget L M Ericsson
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