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. 12, 1977
Filed:
Jun. 04, 1976
Theodore Robert Coburn, Coventry, RI (US);
James Edward Kilcoyne, East Providence, RI (US);
Marshall and Williams Company, Providence, RI (US);
Abstract
The invention comprises a process and apparatus for applying conductive heat to plastic film tapes in a stabilizing unit containing a plurality of rollers forming sets of rollers. Each roller in the set rotates progressively slower than the preceding adjacent roller. Some rollers have heated surfaces to reheat and heat soften the plastic film. Some rollers have cold surfaces to set the film. The progressively slower rotation of the rollers allows the film to release the stresses imparted to the film during the initial stretching operation. In so doing, the molecules rearrange themselves to provide an increased degree of tensile strength in the tapes. The reheating of the film causes shrinkage. However, the progressively slower rotation of adjacent rollers controls the degree of shrinkage and holds the shrinkage to a minimum.