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:
Aug. 09, 2005
Filed:
Feb. 13, 2001
Juan C. Cardona, Lowell, MA (US);
Kevin J. Levesque, Andover, MA (US);
Theodore A. Burnham, Melrose, MA (US);
Alan F. Matthieu, Fitchburg, MA (US);
Roland Y. Kim, Andover, MA (US);
Juan C. Cardona, Lowell, MA (US);
Kevin J. Levesque, Andover, MA (US);
Theodore A. Burnham, Melrose, MA (US);
Alan F. Matthieu, Fitchburg, MA (US);
Roland Y. Kim, Andover, MA (US);
Trexel, Inc., Woburn, MA (US);
Abstract
The invention provides a blowing agent delivery system for introducing a blowing agent into a polymeric foam processing system. The delivery system is designed to discontinuously introduce blowing agent from a continuous source into polymeric material within an extruder. The system, thus, may improve control over blowing agent delivery in discontinuous polymer processing systems such as injection molding or blow molding. In some embodiments, the blowing agent delivery system selectively directs blowing agent flow from the source to the extruder barrel, or through a bypassing passageway. In this manner, blowing agent may be continuously supplied by the source but discontinuously injected into the extruder barrel. During use, the delivery system may cause blowing agent to flow through the bypassing passageway, for example, when the screw stops plasticating polymeric material.