Method of forming articles from a plastic material

Details Method of forming articles from a plastic material Method of forming articles from a plastic material

1986-07-28

1988-04-19

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 404, 264 405, 264 407, 264161, 264169, 26421121, 2642973, 264323, 26432811, 264DIG69, 425145, 425147, 425150, 425215, 425218, 425576, B29C 3334, B29C 4792

Patent

active

047388080

ABSTRACT:
The molding machine of the present invention comprises a screw extruder for extruding plastic material. A plurality of molds are moved one at a time to the outlet end of the extruder for receiving the plastic material therefrom, One end of the mold is open for receiving the plastic material and the opposite end of the mold includes a closure plate covering the end of the mold. The closure plate has a small fill sensing aperture therein. A sensing switch is mounted adjacent the fill sensing aperture and is adapted to sense when molded plastic exits from the fill sensing aperture so as to shut off the extruder and cause the mold to move away from the extruder so that an additional mold can be filled. A cylinder operated closure device clamps the opposite ends of the mold after the mold has moved away from the filling station so as to contain the plastic material within the mold while the plastic material cools and hardens. A trimming knife trims the ends of the mold as it is moving from its fill station to the clamping station.

REFERENCES:
patent: 2026439 (1935-12-01), Sanial
patent: 2375955 (1945-05-01), Smith
patent: 2702408 (1955-02-01), Hartland
patent: 3500541 (1970-03-01), Hammerlund, Jr. et al.
patent: 3593374 (1971-07-01), Sierd
patent: 3814777 (1974-06-01), Schmidt
patent: 4187352 (1980-02-01), Klobbie
patent: 4490315 (1984-12-01), Charlebois et al.

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