The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 28, 2009
Filed:
Nov. 24, 2004
Manfred A. A. Lupke, Thornhill, Ontario, CA;
Stefan A. Lupke, Thornhill, Ontario, CA;
Manfred A. A. Lupke, Thornhill, Ontario, CA;
Stefan A. Lupke, Thornhill, Ontario, CA;
Other;
Abstract
A pipe mold () produces plastic pipe with an internal wall having a first wall portion () and a second wall portion (). The pipe mold () includes a two stage cooling plug () to assist in setting the pipe wall. The first cooling stage () is controlled to remove heat from the pipe wall to partially set the plastic without excessive cooling. The partially set plastic pipe then passes over a second stage () where less precision in the cooling of the pipe occurs. The partially set plastic is more tolerant and subject to less damage. Preferably both the first and second stages () include separate temperature sensors () and control arrangements () for varying the cooling medium of each stage. In a preferred embodiment a cooling medium is circulated through a first stage at a temperature and at a flow rate to maintain the first stage () within a narrow temperature range about the temperature of the cooling medium. The staged cooling plug () allows better control at initial startups and with varying operating conditions.