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:
Jul. 20, 1999
Filed:
Jun. 25, 1997
Applicant:
Inventors:
Masao Fukuda, Shiga, JP;
Yukio Nakagawa, Shiga, JP;
Assignee:
Ishida Co., Ltd., Shiga-Ken, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B65B / ;
U.S. Cl.
CPC ...
53550 ; 53551 ; 533759 ;
Abstract
As a cylindrically formed web of thermoplastic bag-making material is transported longitudinally along a path at a specified speed, a longitudinal sealer with a heater is compressed against and over portions of the material parallel to the path to effect longitudinal sealing. The longitudinal sealer is moved in the meantime along the path at a greater speed in the range of 1.05 to 1.30 times the specified speed of motion of the material such that generation of V-shaped wrinkles known as the chevrons on both sides of the sealed area can be prevented.