Process for preparation of discontinuous filament bundles and sharp-ended filaments
AssigneeAsahi Kasei Kogyo Kabushiki Kaisha
InventorsYasuo Tango, Makoto Kanazaki
Life of this patent
Estimating the term…
Abstract
A process for the preparation of discontinuous filament bundles, which comprises applying a drawing force and/or a shearing force to a bundle of continuous filaments while or immediately after contacting the bundle of continuous filaments with a medium maintained at a temperature lower than -5.degree. C. to cut the respective single filaments constituting the bundle. The individual filaments of the resultant bundle may have on at least one terminal thereof a sharp end cut obliquely and an inclination angle .alpha. of the cut top end to the filament axis of less than 70.degree..
Claims1
In a process for the preparation of discontinuous filament bundles composed of synthetic fibers by applying a drawing force or a drawing force and supplementary shearing force to a bundle of continuous filaments, the improvement which comprises feeding the bundle in the crimp-retained state, made of crimped acrylic type filaments, into a cooling zone maintained at a temperature from -20.degree. C. to -195.degree. C. before applying the drawing force, whereby the discontinuous filaments of the resisting bundle retain their crimp and the shrinkage is controlled.
Dependencies are inferred from the claim text.