Process for hydrodynamic inclusion of a multitude of three-dimensional products of finite dimensions by water jets
AssigneeFleissner GmbH
InventorAlfred Watzl
Life of this patent
Estimating the term…
Abstract
Finite goods are continuously packed between two non-wovens by means of hydrodynamic needling and are fully sealed. When used, said wovens should not nap and should not become linked to the goods during packing. When packed, the volume of the goods should, wherever possible, remain unchanged. In order to achieve said aims, the covering non-wovens are prefixed by means of hydrodynamic needling. Particularly good results are achieved if perforated non-wovens are used to cover the finite products, the number of said perforations being approximately 5-20 perforations per inch, and when said non-wovens are joined to each other by means of water needling.
Claims9
A method for hydrodynamic inclusion of a layer comprising a plurality of three-dimensional finite products of at least two, in some cases three or more nonwovens, tissue, possibly additional woven fabrics or knitted fabrics by means of liquid jets merging continuously and uniformly over a working width of a nozzle bar, by spraying a liquid under pressure from fine nozzle openings arranged in a row from at least one nozzle strip extending over the working width of at least one nozzle bar towards the material web which is moving ahead of the nozzle bar, characterised in that a nonwoven which subsequently covers the middle layer is initially consolidated over the entire surface using water jets, the middle layer to be included, the finite three-dimensional material to be applied thereto, is laid on this consolidated nonwoven, these two layer are then covered with a further nonwoven which has been prefixed in the same way and everything together is again subject to hydrodynamic needling uniformly over the working width to join the two superimposed covering nonwovens together.
A sandwich nonwoven comprising a middle layer of finite three-dimensional goods and water-needled nonwovens covering said layer on both sides, characterised in that the nonwovens are provided with fine holes having a spacing of about 5 to 20, preferably 10 hpi and the nonwovens adhere fixedly to one another around the middle layer whilst the goods of the middle layer remain substantially unchanged three-dimensionally.
Dependencies are inferred from the claim text.