Method and apparatus for forming stacks of sacks
AssigneeWindmoller & Holscher
InventorFritz Achelpohl
Life of this patent
Estimating the term…
Abstract
In a method of stacking sacks of thermoplastic film, the sacks are successively deposited on each other and formed with internested loops of progressively shallower depth.
Claims19
A method of forming stacks from sacks each having at one end a base closed by a transverse weld seam, wherein the leading end of a tubular web of thermoplastic film provided with a transverse weld seam at the end is intermittently moved over the support for the stack, severed from the web by a transverse cut at the spacing of the sack length, and the new web end formed by the cut is closed by a transverse weld seam, and wherein the following sacks likewise formed by transverse weld seams and transverse cuts are deposited on each other up to the desired stack height and the deposited sacks are held at their superposed open sides, characterised in that, starting with the first sack, the individually deposited sacks are at a zone intermediate their ends successively pulled into internested loops of which the depth decreases from sack to sack.
Apparatus for forming stacks of sacks each having at one end a base closed by a transverse weld seam, comprising a pair of feed rollers for the web of tubular film, means for advancing the web end over a support or conveyor means forming the stacking station, parallel means for transversely welding and transversely severing the web, of which the transverse welding means are behind the transverse cutting means in the direction of movement, and means for holding the stack-forming superposed sacks near their open edges, characterised in that the stacking station comprises a transverse gap into which there can be inserted, after depositing each sack, an insert element which extends thereabove and which is provided with control means which, after each bag or sack is deposited, reduce the amount of its insertion by a distance corresponding to the length by which its leading end projects beyond the underlying sack.
Dependencies are inferred from the claim text.