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:
Sep. 08, 1992
Filed:
Jun. 28, 1989
Jean-Pierre Varlet, Le Neubourg, FR;
Valois S.A., , FR;
Abstract
A method of packaging a liquid or a paste in a flexible tube comprising a bottom (14) and a head provided with a dispensing valve (10), comprises at least the following steps: 1) the liquid or paste (13) is inserted into the tube via its bottom (14); and 2) an air vacuum is established inside the tube, and the tube is the closed in sealed manner by welding its bottom (14). Advantageously there is an intermediate step of initially welding the bottom of the paste-filled up-side-down tube only in part. Then, during step 2), after the air has been evacuated, the weld is immediately finished off. In this preferred implementation of the present invention, step 2) is preferably entirely performed by means of apparatus (50) comprising two groups of parts slidably mounted relative to each other and mounted on a press (90) which is connected to a vacuum pump (91). When the bottom notch (51) of the apparatus presses down on the partially-welded bottom (14) of an up-side-down tube (12) in a support (20) which also serves as an abutment for the bottom group (52) of parts, continued downwards displacement of the top group constituted by cylinders (70, 75, and 80), causes a cam (72) and balls (63) to open a valve (57) through which air is sucked out, and then rapidly clamps together jaws (54).