James C Nissel

US Patent:

6575726, Jun 10, 2003

Filed:

Sep 6, 2000

Appl. No.:

09/655554

Inventors:

James C. Nissel - Malvern PA

Assignee:

Welex Incorporated - Blue Bell PA

International Classification:

B29C 4790

US Classification:

425327, 428363, 428367, 428DIG 235

Abstract:

Accurately and uniformly cooling a preformed plastic sheet that is formed at elevated temperature in an elongated plastic sheet die, using upper, middle and lower vertically arranged cylindrical cooling rolls closely spaced to one another to engage the sheet between them, and providing one or more auxiliary cooling rolls connected to provide additional cooling for the sheet.