Process for producing a nonwoven material, plant for implementing it and nonwoven thus obtained
AssigneeRieter Perfojet
InventorsAndre Vuillaume, Frederic Noelle
Life of this patent
Estimating the term…
Abstract
This invention concerns a method and an installation for producing a spunbonded fabric, characterized in that it consists in: producing a spunbonded lap (5) against the surface of which is delivered at least a web (V1 and/or V2) of discontinuous fibers, obtained by carding. The formed complex is compacted by pressing and is continuously transferred onto a line (10) for water jet binding treatment, driving the fibers in the direction of thickness, the fibers which are bound together like a splice between and around the continuous filaments while remaining visible at the surface. After drying, the final product is obtained.
Claims6
A process for the production of a nonwoven of “spunbond” type having mechanical properties equivalent to spunbond webs consolidated by hot calendering and having the appearance, the handle and the pliancy of a conventional textile, which consists in continuously:
- producing a web (S) of “spunbond” type, the bundle of continuous filaments, which is extruded and drawn, being collected in the form of a nonbonded web on a moving conveyor belt;
- delivering, against at least one face of the “spunbond” web thus formed, a sheet (V1 and/or V2) consisting of natural and/or artificial and/or synthetic, discontinuous fibers, obtained by carding and having a grammage of between 10 g/m2 and 50 g/m2;
- compacting the complex thus formed by cold pressing it;
- transferring, still continuously, said complex onto a treatment line (10) for bonding it by means of water jets which act against the surface or surfaces of the complex consisting of discontinuous fibers and entrain said fibers in the thickness direction, which fibers bond together in the manner of a splice between and around the continuous filaments, while still remaining visible on the surface;
- carrying out a drying treatment;
- and then collecting the finished product.
A plant for producing a nonwoven of “spunbond” type, comprising, arranged in line:
- a unit (1) for forming, on a conveyor belt (5), a web (S) of continuous filaments of “spunbond”type;
- at least one carding machine (6 and/or 9) for delivering, against at least one face of the “spunbond” web produced, a sheet (V1 and/or V2) of discontinuous fibers and having a grammage of between 10 g/m2 and 50 g/m2;
- means for cold pressing the complex formed, followed by a zone (10) for treatment by means of fluid jets, which act at least against the surface covered with discontinuous fibers and entrain said fibers in the thickness direction, which fibers bond together in the manner of a splice between and around the continuous fibers, while still being visible on the surface;
- means for drying and collecting the bonded web, characterized in that it includes, between the water-jet bonding means (10) and the drying means, a textiling unit delivering a coarse fabric (22) which is intended to support the bonded complex and is associated with a perforated rotary drum inside which an injector (23) fed with pressurized water is placed, this unit producing jets which reorient the fibers, a suction unit (25) for removing the water being placed beneath the conveyor.
Dependencies are inferred from the claim text.