US 9,809,354 B2
Method of making a woven plastic bag
Jochen Brauer, Lohne (DE); Sabine Scheele, Steinfeld (DE); and Jens Koesters, Wallenhorst (DE)
Assigned to MONDI CONSUMER PACKAGING TECHNOLOGIES GMBH, Gronau (DE)
Filed by MONDI Consumer Packaging Technologies GmbH, Gronau (DE)
Filed on Dec. 21, 2015, as Appl. No. 14/975,934.
Claims priority of application No. 14200207 (EP), filed on Dec. 23, 2014.
Prior Publication US 2016/0176579 A1, Jun. 23, 2016
Int. Cl. B31B 21/60 (2006.01); B65D 30/00 (2006.01); B65D 30/20 (2006.01); B65D 33/08 (2006.01); B31B 37/00 (2006.01); B31B 19/00 (2006.01)
CPC B65D 29/00 (2013.01) [B31B 19/00 (2013.01); B31B 37/00 (2013.01); B65D 31/10 (2013.01); B65D 33/08 (2013.01); B31B 2219/23 (2013.01); B31B 2219/269 (2013.01); B31B 2219/2681 (2013.01); B31B 2219/603 (2013.01); B31B 2219/6007 (2013.01); B31B 2219/6061 (2013.01); B31B 2219/62 (2013.01); B31B 2237/05 (2013.01); B31B 2237/20 (2013.01); B31B 2237/403 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of making a woven plastic bag, the method comprising the steps of:
feeding in a longitudinal production direction a flat-lying fabric web having a layer of woven-together plastic attachment strips on a first face, opposite longitudinal edge regions spaced from each other perpendicular to the production direction along a transverse direction and each extending over only part of a transverse width of the fabric web, and a middle section between the longitudinal edge regions;
applying to the first face of the fabric web a pattern that repeats along the production direction only locally with a coating in the form of a film or in the form of a liquid plastic of a width or shape that varies in a transverse direction;
shaping the fabric web into a fabric tube;
in order to form individual woven plastic bags, cutting the fabric tube transversely into pieces of the fabric tube suitable for subsequent filling and sealing;
connecting together mutually opposite surfaces of the bag wall with the coating along at least one joint seam that extends transversely; and
forming the joint seam with at least one step in the transverse direction such that a dimension of the joint seam determined in a longitudinal direction changes at the step.