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)
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.