Process for injection molding with incremental initial ejection

Details Process for injection molding with incremental initial ejection Process for injection molding with incremental initial ejection

1996-12-31

1999-08-03

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

264334, 264335, 425556, 425577, 425438, B29C 4540

Patent

active

059321644

ABSTRACT:
A method of molding plastic parts, particularly those with low draft angles, textured surfaces or other mold release challenges, comprising the steps of placing a cavity substantially defining the exterior of the plastic part and a core substantially defining the interior of the plastic part into position defining the plastic part therebetween and injecting heated thermoplastic between the cavity and the core to form the plastic part. The molding machine is then operated to simultaneously withdraw the core and incrementally eject the plastic part from the core by an incremental ejection distance insufficient to disengage the plastic part from the core, wherein the plastic part is supported by the cavity during the incremental ejection from the core. The molding machine is next operated to withdraw the core and the part engaged thereon from the cavity, and fully eject the part from the core. The incremental ejection breaks the adhesion between the part and the core while the part is supported in the cavity, making full ejection of the part easier.

REFERENCES:
patent: 4756865 (1988-07-01), Von Holdt
patent: 4777004 (1988-10-01), Galer
patent: 4935187 (1990-06-01), Vente et al.
patent: 4935188 (1990-06-01), Sorensen
patent: 5145630 (1992-09-01), Schad
patent: 5171585 (1992-12-01), Onisawa et al.
patent: 5281385 (1994-01-01), Julian
patent: 5419865 (1995-05-01), Ogata et al.
patent: 5490966 (1996-02-01), Peterson et al.
patent: 5716582 (1998-02-01), Brown et al.
patent: 5824256 (1998-10-01), Ballester

Affiliated with

Also associated with

Rating

Process for injection molding with incremental initial ejection does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for injection molding with incremental initial ejection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for injection molding with incremental initial ejection will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-847120