Process for preparing extruded foam bodies

Details Process for preparing extruded foam bodies Process for preparing extruded foam bodies

B - Operations, Transporting

29

C

18/664

B29C 44/50 (2006.01) B29C 47/78 (2006.01) C08J 9/14 (2006.01)

Patent

CA 2011023

A process for preparing an extruded thermoplastic resin elongate foam body comprising an alkenyl-substituted aromatic resin characterized as having a density of between about 0.9 to about 3.5 pounds per cubic foot is described. The process comprises the steps of (A) heat plastifying the thermoplastic resin; (B) adding at least one fluid blowing agent comprising at least one of 1-chloro-1,1-difluoroethane, 1,1,1,2-tetrafluoroethane and 2-chloro-1,1,1,2-tetra- fluoroethane; (C) uniformly mixing the blowing agent in the resin under a pressure sufficient to prevent blowing of the resin thereby forming a blowable resin mixture; (D) extruding the mixture into a region of reduced pressure which is less than atmospheric pressure wherein the blowable resin mixture expands into a foam body; and (E) cooling the foam body. In one embodiment, the region of less than atmospheric pressure is formed by an elongated chamber (15) with the blowable resin mixture passing through a die (20) at one end of such chamber and such foam body passing through a pool of water (17) at the opposite end of the chamber. The process results in the formation of extruded expanded thermoplastic resins such as polystyrene resins characterized as having relatively small average cell sizes such as from about 0.2 to about 0.5 mm., improved and higher compressive strengths, and higher cell volumes.

Affiliated with

Also associated with

Rating

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

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1999126