Method and device for producing bags from tubular bag bodies

Abstract

A device (1) for producing bags from tubular bag bodies (10) comprises a transport device (2) which transports the bag bodies in a flat manner transversely to the longitudinal extent (L) thereof in a transporting direction (T) at a transport rate (V). While being transported, the bag bodies pass through processing stations (30, 40, 50, 60, 70, 80) by way of which at least one end region (13) of each bag body is formed into a cross bottom and optionally a cover sheet (19) is applied to the cross bottom. A transfer device (4) moves the bag bodies (10) to be transported by the transport device at a transfer rate (U), with respect to bag bodies conveyed at a transport rate (V), by a feeding distance ([Delta]y) in the transporting direction (T) and then transfers them to the transport device (2). The feeding distance ([Delta]y) is selected such that successive bag bodies overlap one another, wherein the overlapping width preferably corresponds to once or twice the height (h) of the triangular corner fold (14) which is produced when the bottom side flaps (15, 16) are folded over.

Description

technical field [0001] The present invention relates to a method and a device for producing a bag from a tubular bag body, wherein the bag body is preferably made of a fabric of plastic strips or a non-woven plastic material (such as a plastic non-woven fabric), or of a fabric of plastic strips and Composite material of non-woven plastic material or made of plastic film connected in a web-like structure, wherein said material is optionally coated on at least one side with at least one plastic layer and / or at least one plastic film ( such as oriented polypropylene film). The bags are conveyed on the conveying device in a direction of conveyance at a conveying speed, in a plane transverse to their longitudinal extent, wherein said bags pass a processing station during conveying, by means of which at least one end of each bag The lower region is formed as a cross-bottom, and optionally a cover sheet is applied to said cross-bottom. Background technique [0002] Box bags, also...

AI Technical Summary

Problems solved by technology

[0009] Another disadvantage of the fixed set relationship is that the hot air welding device required to apply the bottom cover sheet is idling between successive bags or successive bottom cover sheets, respectively, so that a large amount of energy is discharged into the environment in the form of hot air. Not utilized because closing and opening the hot-air welding unit between successive bags is not feasible for process-technical reasons

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