Method for applying afterpressure on injection molding compounds

Details Method for applying afterpressure on injection molding compounds Method for applying afterpressure on injection molding compounds

1995-05-31

1996-02-27

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

26432819, 425146, 425557, 425562, B29C 4557

Patent

active

054946328

ABSTRACT:
A method and an apparatus for applying afterpressure on injection molding compounds, particularly PET compounds in an injection molding machine including an injection mold and a screw connected to the injection mold through supply ducts. The injection molding material is conducted to the mold cavity by the screw in order to fill the injection mold. After the filling procedure has been concluded, the material flow is cutoff in the vicinity of the screw opening. During the phase of material shrinkage, the loss of volume is compensated by additionally conveying material present in the supply duct between the screw and the mold cavity. After cooling of the injection molding material, the continuous material flow of injection molding material into the mold cavity is separated from the material flow in the supply duct. After adjusting the pressure of the material in the supply duct to the pressure of the material in the screw, the separation from the screw is again opened and the material flow to the supply duct is released in order to once again form a continuous material flow. The material flow to the supply duct is again released without interruption of the material strand for an unimpaired injection procedure.

REFERENCES:
patent: 4695238 (1987-09-01), Taniguchi
patent: 5135701 (1992-08-01), Farrell
patent: 5219512 (1993-06-01), Tsutsumi

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