Method of press forming of plastic material

Details Method of press forming of plastic material Method of press forming of plastic material

1981-04-02

1983-09-06

Czaja, Donald E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Plural sequential shaping or molding steps on same workpiece

264319, 26433111, B29B 302, B29B 506

Patent

active

044029012

ABSTRACT:
A method of press forming plastic material by a press having upper and lower moulds, in which melt plastic material is extruded from an extruder and is supplied to a metering chamber. The metering chamber supplies a metered amount of material into a movable arm which moves over the mould surface area of the lower mould and injects the material from an injection port of the arm, while the arm is moving. By suitably controlling the movement of the arm and material supply from the metering chamber, a desired charge pattern formed by a parapet shaped injected material can be formed. Automatic programming by a microprocessing unit is also easy.

REFERENCES:
patent: 3434821 (1969-03-01), Wiley
patent: 3670066 (1972-06-01), Valyi
patent: 3736201 (1973-05-01), Teraoka
patent: 3822794 (1974-07-01), Fougea
patent: 4089926 (1978-05-01), Taylor

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