Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1996-07-17
1998-05-26
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
26432817, 425208, 425586, 425587, B29C 4552
Patent
active
057560374
ABSTRACT:
A method for injecting a molten resin by an injection machine comprises the steps of opening a ring valve mounted on an injection screw by the normal revolution of a injection screw thereof; metering the molten resin; stopping the revolution of said injection screw; moving said injection screw backward, performing the reverse revolution of the injection screw at the moved-back position for the required amount to generate a differential pressure; making the ring valve come in proximity to or into contact with a valve seat at the tip of a screw body of the injection screw by said differential pressure; and injecting the metered resin by the forward movement of the injection screw so as to complete the closure of the ring valve. According to the longer stroke of the injection screw, the ring valve is certainly closed by the backward, rotative and forward movements of the injection screw and thereby an injection operation is maintained more precisely in the dispersion of the injecting quantities than before.
REFERENCES:
patent: 4767306 (1988-08-01), Kawaguchi et al.
patent: 4879077 (1989-11-01), Shimizu et al.
patent: 5002717 (1991-03-01), Taniguchi
patent: 5112213 (1992-05-01), Oas
Heitbrink Jill L.
Nissei Plastic Industrial Co. Ltd.
LandOfFree
Method for injecting molten resin by injection machine does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for injecting molten resin by injection machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for injecting molten resin by injection machine will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1957012