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:
Jun. 19, 1979
Filed:
Apr. 04, 1977
Ingvar E Nilsson, Akarp, SE;
Tetra Pak Developpement SA, Lausanne, CH;
Abstract
A method and an apparatus for treating mouth areas of rigid plastic containers in order to prevent cracking during the capping of the containers. The width of the mouth opening of the container is prior to capping temporarily increased by means of a mandrel, which at a relatively low speed is introduced into the mouth opening. This results in a cold working and stretching of the plastic material adjacent to the opening and when the mandrel after a short while is with-drawn from the mouth opening the plastic material around the same is given a molecular orientation in the circumferential direction. The preferred apparatus includes fixing elements for holding a container so that its mouth opening is aligned with the mandrel, which is cylindrical with a somewhat greater diameter than the mouth opening and axially displaceable into the mouth opening.