US 2001/0023569 A1 · Method and apparatus for manufacturing packaging bags, and bags obtained thereby

Abstract

The present invention relates to a method of manufacturing packaging bags having lateral bellows, the method being characterized by the fact that it comprises the steps consisting in: forming respective cutouts (150, 160) in each of the two lateral, bellows-forming zones of a packaging bag sheet (100) so that the bag has only two thicknesses superposed at the mouth of said bellows, at least over a portion of its width; and heat-sealing (184, 186) the adjacent edges of the sheet to the peripheries of the cutouts (150, 160) to close the bag. The invention also provides apparatus for implementing the method and bags obtained thereby.

Claims33

Dependent claims

A method of manufacturing packaging bags having lateral bellows, the method being characterized by the fact that it comprises the steps consisting in:

forming respective cutouts (150, 160) in each of the two lateral, bellows-forming zones of a packaging bag sheet (100) so that the bag has only two thicknesses superposed at the mouth of said bellows, at least over a portion of its width;
and
heat-sealing (184, 186) the adjacent edges of the sheet to the peripheries of the cutouts (150, 160) to close the bag.

Dependencies are inferred from the claim text.

Facts

Application

09/871,613Filed 4 Jun 2001

Priority

FR 97 0093629 Jan 1997

Published

27 Sep 2001

Term ends

Not estimatedThe source records don’t support an estimate.

Classification6 codes

B65D 31/10
Bags or like containers made of paper and having structural provision for thickness of contents: with gusseted sides
B31B 70/266
Involving longitudinally folding, i.e. along a line parallel to the direction of movement: involving gusset-forming
B31B 70/36
Folding sheets, blanks or webs: by continuously feeding them to stationary members, e.g. plates, ploughs or cores
B31B 70/8131
Applying closures: making bags having interengaging closure elements

Method and apparatus for manufacturing packaging bags, and bags obtained thereby

Life of this patent

Method and apparatus for manufacturing packaging bags, and bags obtained thereby

Life of this patent

Abstract

Claims33