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US 6,416,452 B1Granted
Method of producing mutliwall plastic bags, especially tie bags
AssigneeLemo Maschinenbau GmbH
InventorArmin Meyer
Life of this patent
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Abstract
A method of making multiwall plastic bags wherein half-width foil webs are unwound from respective rolls below a segment of a path within which a multilayer full-width web is guided. The half-width webs can be slit and unfolded or simply unfolded to form full-width single-layer webs which are combined by superimposition to form the multilayer full-width web. The latter is folded and the folded multilayer width is formed into the bags.
Claims11
A method of making multiwall plastic bags comprising the steps of:
- (a) unwinding a plurality of double-layer substantially half-width foil webs from respective rolls and guiding the unwound double-layer substantially half-width foil webs along initial segments of a path;
- (b) splitting a wall of each of said half-width foil webs and unfolding the double-layer substantially half-width foil webs along said initial segments into substantially full-width single-layer webs so that outer edges of said single-layer webs correspond to edges formed on splitting the half-width foil webs;
- (c) superimposing one of said substantially full-width single-layer webs on at least one other of said substantially full-width single-layer webs coextensively to form a multilayer full-width web along a subsequent segment of said path;
- (d) folding said multilayer full-width web generally in a U shape along a further segment of said path to form a folded multilayer web;
- and
- (e) forming bags in said folded multilayer web.
3 more elements
Dependencies are inferred from the claim text.