Extruder screw for use in foam plastic extruder

Details Extruder screw for use in foam plastic extruder Extruder screw for use in foam plastic extruder

1992-09-24

1994-03-29

Simmons, David A.

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

Within pressurizing chamber

366 75, 366 76, 425207, B29C 4700

Patent

active

052979482

ABSTRACT:
In the production of foamed plastic articles using a screw extruder, it is known to introduce a gaseous foaming agent into the plastic while the latter is passing through the extruder. It has been found that a foamed thermoplastic with pores or cells of uniform size and distribution can be produced by passing a gaseous foaming agent, e.g. nitrogen gas through a central passage extending substantially the entire length of the extruder screw, discharging the agent into the thermoplastic proximate the discharge end of the extruder, and mixing the foaming agent with the plastic immediately prior to discharge of the mixture into a mold.

REFERENCES:
patent: 2622469 (1952-12-01), Gray
patent: 2754542 (1956-07-01), Henning et al.
patent: 3110060 (1963-11-01), Rengert
patent: 3121914 (1964-02-01), Olson et al.
patent: 3371379 (1968-03-01), Reifenhauser
patent: 3689182 (1972-09-01), Kovacs
patent: 3712594 (1973-01-01), Schippers et al.
patent: 4094946 (1978-06-01), Finkensiep et al.
patent: 4558954 (1985-12-01), Barr
patent: 4859068 (1989-08-01), Sironi
patent: 4877568 (1989-10-01), Austin
patent: 4966539 (1990-10-01), Pena

Affiliated with

Also associated with

Rating

Extruder screw for use in foam plastic extruder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Extruder screw for use in foam plastic extruder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extruder screw for use in foam plastic extruder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-787692