Centralized process for the manufacture of a spunbonded fabric of thermobonded curled bicomponent fibers
AssigneeCorovin GmbH
InventorsAxel Nickel, Stefan Etzold
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Abstract
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.
Claims5
A process for the manufacture of a spunbonded fabric comprising the following steps:
- (a) drawing bicomponent fibers melt spun from two different polypropylene granulates with a first polypropylene granulate having an MFI viscosity range of 16 to 35 and a second polypropylene granulate having an MFI viscosity range which is 8 to 10 points below the MFI viscosity range of the first polypropylene granulate,
- (b) placing the bicomponent fibers on a sieve belt and thermobonding the bicomponent fibers to obtain a nonwoven fabric,
- (c) stretching the bicomponent fibers to be curled of the nonwoven fabric lengthwise and/or transversely and heating the bicomponent fibers during the stretching, and thereafter
- (d) relaxing the bicomponent fibers of the nonwoven fabric to obtain the spunbonded fabric with curled bicomponent fibers.
Dependencies are inferred from the claim text.