Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Opposed registering coacting female molds
Patent
1989-10-31
1991-12-10
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Opposed registering coacting female molds
4251261, 425127, 425233, 425236, 425261, 425361, 425437, 425577, 425588, 425809, B29C 3910, B29C 4514
Patent
active
050713396
ABSTRACT:
A compression molding apparatus includes a rotatable supporting member and circumferentially spaced molds mounted on the rotatable supporting member. The molds are conveyed successively through a plastic material feed zone, a compression molding zone and a discharge zone by the rotation of the rotatable supporting member. A plastic material in a heat softened state is fed into the molds which are disposed within the plastic material feed zone. Each of the molds include a first mold portion and a second mold portion which defines a mold cavity. The mold is opened and closed by moving the mold portions relative to each other in a predetermined direction. A conduit hole extending from the mold cavity is formed in the second mold portion. Each mold includes a compression rod which slides in the conduit hole. The conduit hole has a plastic receiving portion opened frontwardly in the rotating direction of the rotatable supporting member. The plastic material feeder includes an extruder which has an opening opposite to a passage for conveying the plastic. The extruder is constructed such that the heat softened plastic material extruded from the extrusion opening is received in the plastic receiving portion of the conduit hole and cut. The extrusion opening is elongated in the conveying direction of the plastic receiving portion and has a portion progressively wider downstream as viewed in the conveying direction.
REFERENCES:
patent: 695507 (1902-03-01), Strang
patent: 1262385 (1918-04-01), Penza
patent: 3458907 (1969-08-01), Shannon
patent: 4312687 (1982-01-01), Sigworth, Jr.
patent: 4424015 (1984-01-01), Black
Murayama Kashiwa
Tatsuta Masakazu
Matney, Jr. William J.
Toyo Seikan Kaisha Ltd.
Woo Jay H.
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