Corovin Gmbh

Stefan Etzold

Axel Nickel

Joachim Bauer

Disclosed is a method for producing a non-woven fiber fabric comprising a plurality of perforated structures extending along the entire cross-section of said fabric. The inventive method consists of the following steps: in a first step, the matted fibers are placed on a belt screen to form a web of fibers; in a second step, the web of fibers is conveyed to a perforated-structure manufacturing unit, in a third step, the perforated structures are manufactured by mechanically impinging upon the fibers, whereby the mechanical impingement upon said fibers does not affect the mechanical and chemical structure thereof; and in a fourth step, the web of fibers provided with said perforated structures is compacted in a compaction unit for form a non-woven fabric.

Method for producing a non-woven fibre fabric

A process is disclosed for the manufacture of a spunbonded fabric consisting of thermobonded curled bicomponent fibers where the bicomponent fibers consist of two plastic materials with different properties. The process according to the invention consist of three steps: the fibers spun from the two plastic materials are drawn off uncurled and stretched in a first step. In a second step the fibers are placed on a sieve belt and thermobonded. In a third step the bicomponent fibers of the obtained nonwoven fabric are finally curled by lengthwise and/or transverse stretching and heat treatment.

Centralized process for the manufacture of a spunbonded fabric of thermobonded curled bicomponent fibers

A process is disclosed for the manufacture of a spunbonded fabric consisting of thermobonded curled bicomponent fibers where the bicomponent fibers consist of two plastic materials with different properties. The process according to the invention consists of three steps: the fibers spun from the two plastic materials are drawn off uncurled and stretched in a first step. In a second step the fibers are placed on a sieve belt and thermobonded. In a third step the bicomponent fibers of the obtained nonwoven fabric are finally curled by lengthwise and/or transverse stretching and heat treatment.

Method for producing a spunbonded fabric from thermobonded crimped bicomponent fibers

A waterproof multi-layered non-woven fabric having good vapor permeability and method for its production are provided. At least one layer of coarse melt-spun filaments of a thermoplastic polymer is thermally bonded at intermittent points to at least one layer of fine melt-blown microfibers. The bonded layers next are subjected while heated to a force in at least one direction in the absence of tearing so as to accomplish the permanent elongation of coarse melt-spun filaments and the straightening of fine melt-blown microfibers in the direction of the force in the substantial absence of drawing. Fine melt-blown microfibers when straightened in this manner form a less thick and denser array within the resulting fabric. The resulting product is capable of deterring the passage of liquid water, exhibits substantial vapor permeability, and exhibits a reduced basis weight. According, the product is suitable for use as a filter to remove solid particles from a gas, as a diaper component, to form protective clothing for medical applications, in the production of a roofing material, etc. The resulting product provides significant economic advantages since a reduced quantity of thermoplastic polymer is required per unit area of product while retaining desired service characteristics.

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Langenhagen, Germany

Stefan Etzold