Printer Friendly

Extrude Foamed Wood Composites Without Drying.

A new two-stage extruder system devolatilizes and extrudes wood-filled compounds in one extrusion pass without needing a dryer or a second extruder. The first stage of the system is a preheating and drying section with two short, heated screws and a passive vent. It feeds vertically into a longer twin-screw plasticating and mixing section with three vacuum vents. This is the first extrusion system developed by Coronado Engineering Inc. in Salina, Kan., which typically designs and installs blending and compounding plants. Coronado delivered its first extruder system in May and has five more on order. The first is of 4-in. diam. and makes plastic lumber. Coronado is now designing 5-in. and 6.2-in. versions.

The new system increases the volume of melt exposed to devolatilizing by using screws with deeper roots for longer residence time. The system has 34:1 L/D, including both sections, but devolatilizes as effectively as a 42:1 conventional extruder, Coronado says. It can extrude foamed or unfoamed wood-filled PVC, PP, and PE at rates up to 1200 lb/hr.
COPYRIGHT 2001 Gardner Publications, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2001, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

Article Details
Printer friendly Cite/link Email Feedback
Title Annotation:new system from Coronado Engineering Inc.
Comment:Extrude Foamed Wood Composites Without Drying.(new system from Coronado Engineering Inc.)
Publication:Plastics Technology
Article Type:Brief Article
Geographic Code:1USA
Date:Sep 1, 2001
Previous Article:Novel Process Makes Cascade Of Clear Optical Film.
Next Article:Check PET Bottle Quality in Real-Time.

Related Articles
Microcells Lift Output Of PVC Foam Profiles.
Kenaf natural fiber stiffens lumber profiles. (Extrusion).
Blowing agents. (Product Lines Reviewed).
PVDF latex foam composites provide high flame resistance. (Materials: Close-Up).
Disposable packaging goes 'natural'. (Packaging: Close-Up).
'Self-reinforcing' thermoplastic is harder, stronger, stiffer without added fibers. (Materials: Close-Up).
NPE highlights compounding's growth niches: show exhibitors say long-fiber wood composites, direct extrusion/compounding, and reactive compounding...

Terms of use | Privacy policy | Copyright © 2019 Farlex, Inc. | Feedback | For webmasters