Injection moulding method and apparatus with mould runner reserv

Details Injection moulding method and apparatus with mould runner reserv Injection moulding method and apparatus with mould runner reserv

1978-07-06

1981-03-17

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

425558, B29F 106

Patent

active

042566894

ABSTRACT:
Method and apparatus for injection moulding of thermoplastic materials in which a screw in a plasticizer acts as an injection ram to inject plasticized material through a heated runner system into a mould. Part of the injected shot of plasticized material is passed into a reservoir communicating with the runner system. Upon completion of the injection of the shot, the passage from the plasticizer is closed by a valve and the screw is returned to plasticizing position while a pressure is applied to the plasticized material in the reservoir to force it into the runner system to apply a positive pressure so that an article is formed in the mold free of sink marks or weak spots. The reservoir may be provided in series with the shot injecting passage from the screw plasticizer by a nozzle on the plasticizer acting as a piston movable in a cylinder communicating with the runner system of the mould, the valve acting to close the plasticizer from the end of the mould. In an improved arrangement, the mould and cylinder may also constitute a reservoir receiving additional plasticized material from the mould before a succeeding shot of plasticized material is injected by ram action of the screw. In that case, the total amount of plasticized material for the succeeding operation is increased by the amount in the reservoir.

REFERENCES:
patent: 3020591 (1962-02-01), Breher
patent: 3609817 (1971-10-01), Deerberg
patent: 3670066 (1972-06-01), Valyi
patent: 3677682 (1972-07-01), Putkowski
patent: 3709644 (1973-01-01), Farrell
patent: 3774811 (1973-11-01), Staerman
patent: 3813014 (1974-05-01), Guerin
patent: 3847525 (1974-11-01), Bielfeldt

Affiliated with

Also associated with

Rating

Injection moulding method and apparatus with mould runner reserv does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Injection moulding method and apparatus with mould runner reserv, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Injection moulding method and apparatus with mould runner reserv will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1645574