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:
Feb. 08, 2005
Filed:
Jan. 27, 2003
Yanping Qiu, Middleton, WI (US);
Johannes W. Van DE Camp, Hartsville, SC (US);
Mark P. Burns, Hartsville, SC (US);
Xiaokai Niu, Hartsville, SC (US);
Cliff A. Bellum, Hartsville, SC (US);
Yanping Qiu, Middleton, WI (US);
Johannes W. van de Camp, Hartsville, SC (US);
Mark P. Burns, Hartsville, SC (US);
Xiaokai Niu, Hartsville, SC (US);
Cliff A. Bellum, Hartsville, SC (US);
Sonoco Development, Inc., Hartsville, SC (US);
Abstract
Wide ply gaps are intentionally introduced into one or more plies in a radially intermediate zone of the wall of a spirally wound tube. Each ply having wide ply gaps is narrower than the width that would ordinarily be employed at a given spiral winding angle to achieve a butt joint between adjacent edges of consecutive turns of the ply, and the ply is wound at that given spiral winding angle in such a manner that gaps are defined between the adjacent edges of the consecutive turns of the ply. The wide ply gaps have the effect of increasing the compliance of the intermediate zone of the tube wall in the radial direction. Such increased radial compliance has been found to improve the ID stiffness of the tube relative to a tube constructed of the same materials but having no ply gaps in the intermediate zone.