Method and machine for forming articles from a plastic material

Details Method and machine for forming articles from a plastic material Method and machine for forming articles from a plastic material

1985-11-18

1986-12-02

Hart, Charles

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

425147, 425377, 425360, 425576, 425594, 264 405, B29B 1106

Patent

active

046261893

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: 2375955 (1945-05-01), Smith
patent: 3500541 (1970-03-01), Hammerlund et al.
patent: 3663139 (1972-05-01), Robbins et al.
patent: 4187352 (1980-02-01), Klobbie

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