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:
Oct. 22, 1991
Filed:
Sep. 08, 1989
Bruno Kagi, Uezwil, CH;
Strapex AG, Wohlen, CH;
Abstract
A tensioning and sealing apparatus, for tensioning and sealing a strap made of a plastic passed around a packaged item, is disclosed. The apparatus includes a clamping device for securing a lower starting section of a plastic strap. The apparatus of the invention further includes a tensioning device for both tensioning the strap and for acting upon an upper section thereof. Upstream from the tensioning device, a friction welding device is provided which preferably includes two welding dies, which are movable relative to one another, for joining mutually overlapping regions of the strap. A cutting member is further provided, preferably arranged between the friction welding device and the tensioning device, for cutting through the upper section of the strap after the strap has been welded. A clean cut of the strap is accomplished by a strap tension holding device, which acts upon a section of the strap downstream of the friction welding device, after completion of the tensioning operation, which is used for maintaining a residual tensile stress (.sigma..sub.2) of the portion of the strap downstream of the welding device. This residual tensile stress (.sigma..sub.2) is to be less than the tensile stress (.sigma..sub.1) in the plastic strap at the end of the tensioning operation.