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:
Dec. 13, 1983
Filed:
Mar. 23, 1982
Arden L Kunkel, Tacoma, WA (US);
Darrell E Pierson, Federal Way, WA (US);
Weyerhaeuser Company, Tacoma, WA (US);
Abstract
A method of uniformly applying a foamed adhesive to a normally moving substrate which is subject to stops and starts at irregular intervals. A uniform spread weight of adhesive is applied during a deceleration period and startups can be accomplished without causing puddles or gaps. The method is especially useful in conjunction with an automated plywood lay-up line. Foamed adhesive is supplied under pressure to an extrusion head. When a line stoppage is sensed a first valve above the extrusion head closes. Adhesive within the head continues to expand and fall onto the substrate, but does so at a descreasing rate during the deceleration time. As the substrate comes to a complete stop a second valve prevents further adhesive from being applied. Before a startup, the adhesive in the system is reconditioned by passing it into a recycle line until foam quality andpressure drop across the extrusion head have again assumed normal operating parameters. Only then is the substrate movement started. At that time application of adhesive is resumed.