Method for injection foam molding

Details Method for injection foam molding Method for injection foam molding

1977-10-25

1979-05-22

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 50, 264328, 264DIG83, B29D 2700

Patent

active

041559690

ABSTRACT:
A method for the manufacture by foam molding of plastic products by first injecting into a mold non-cellular plastic resin and then injecting a foamed plastic resin of the same basic composition as the non-cellular plastic resin. The process and apparatus consisting of a single extruder and single injection chamber wherein the non-cellular and foamed plastic resin are extruded from the same extruder and stored in an accumulator until shot into the mold by a hydraulic cylinder. Controls are provided for the correct amount of each type of resin to be extruded and stored and the process can be adapted so that the sprue portion of the final product will be solid resin. By a simple addition, coloring of the resin may be accomplished so that the basic resin, method or apparatus will not require changes.

REFERENCES:
patent: 3437722 (1969-04-01), Cronin et al.
patent: 3531553 (1970-09-01), Bodkins
patent: 3891362 (1975-06-01), DeVita
patent: 3906066 (1975-09-01), Barrie
patent: 3941529 (1976-03-01), Klingebiel
patent: 3950484 (1976-04-01), Egli
patent: 4017225 (1977-04-01), Hanning
Whittington, Lloyd R., "Whittington's Dictionary of Plastics", Stamford, Conn., Technomic, c1968, pp. 179-181.

Affiliated with

Also associated with

Rating

Method for injection foam molding 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 injection foam molding, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for injection foam molding will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1040400