Extruder screw and method for the extrusion of thermally sensiti

Details Extruder screw and method for the extrusion of thermally sensiti Extruder screw and method for the extrusion of thermally sensiti

1989-06-16

1991-02-19

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264349, 366 81, 366 89, 366 90, 366319, 366323, 366324, 425207, 425208, 425209, B29C 4700, B29C 4760, B29C 4764

Patent

active

049942239

ABSTRACT:
An extruder screw and a method for extrusion to achieve high output rates with thermally sensitive plastic materials and without thermal degradation problems involving the use of a single flight metering type extruder screw having an initial feed zone, distal metering zone, and a transition zone interconnecting the feed and metering zones. In particular, improvements in the extrusion of thermally sensitive plastics such as PVC are achieved through use of a compression ratio of approximately 2:1, a constant lead and pitch, and a proportioning of the length of the feed zone, transition zone, and metering zone relative to the total length of the zones of 27-33%, 23-25%, and 45-48%, respectively. To achieve cooler and more uniform mixing with rigid PVC, polyethylene and like materials, an improved arrangement for using rings of mixing pins is provided.

REFERENCES:
patent: 3676034 (1972-07-01), Wendricks
patent: 3762693 (1973-10-01), DeBoo et al.
patent: 3767754 (1973-10-01), Manning et al.
patent: 4243629 (1981-01-01), Tramezzani
patent: 4280802 (1981-07-01), Lang et al.
patent: 4321229 (1982-03-01), Blakeslee, III et al.
patent: 4367190 (1983-01-01), Beach
patent: 4867927 (1989-09-01), Funaki et al.

Affiliated with

Also associated with

Rating

Extruder screw and method for the extrusion of thermally sensiti 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 and method for the extrusion of thermally sensiti, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Extruder screw and method for the extrusion of thermally sensiti will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1141966