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:
Nov. 09, 1993
Filed:
Aug. 23, 1991
Kintaro Aihara, Chiba, JP;
Tadashi Honda, Tokyo, JP;
Masashi Kobayashi, Kisarazu, JP;
Hideyo Rohyama, Yokohama, JP;
Kazuhiko Kurihara, Tokyo, JP;
Hiroshi Yazawa, Kunitachi, JP;
Toshikazu Ohishi, Kawaguchi, JP;
Nippon Petrochemicals Co., Ltd., Tokyo, JP;
Polymer Processing Research Institute, Ltd., Tokyo, JP;
Abstract
A pair of stretching pulleys are rotatably mounted on a pair of support plates within a housing. A belt is wound around the upper part of the stretching pulley and a number of turn pulleys. A film introduced onto the stretching pulley is held between the belt and the stretching pulley and is transferred. Air flow generated by a fan and heated with a heater is blown against the film through a louver and circulates through bellows mounted to the housing to return to the fan. The stretching pulley is partially cooled in a water bath. The support plates are rotatably connected to screw shafts, thereby changing a distance and angle between the plates. The stretch width or stretch ratio of the film is thus adjusted with the change of the distance and angle.