METHOD AND DEVICE FOR SPREADING FIBER STRANDS

摘要

A method and a device for spreading a fiber strand to provide a strip-type fiber strand. In particular, the initial fiber strand is provided with an initial width and thickness, and is then spread to form the strip-type fiber strand having a greater final width and a smaller final thickness as compared to the initial width and thickness. The fiber strand consists of continuous multifilament fibers.

主权项

1. A method for spreading a fiber strand with an initial width and with an initial thickness to a strip-type fiber strand with a greater final width and with a smaller final thickness, wherein the fiber strand consists of continuous multifilament fibers, comprising;
moving the fiber strand from an unwinding unit to a winding unit in the longitudinal direction (x-direction); and passing the fiber strand through a spreader station between the unwinding unit and the winding unit, while holding the fiber strand under an adjustable tension wherein the fiber strand in the spreader station is placed under uniform tension during its entire passage; wherein in the spreader station the fiber strand contacts at least one sonotrode and by means of vibrations introduced into the fiber strand from above and/or from below (z-direction) by a front-side contact surface of the sonotrode, the fiber strand is uniformly spread transverse to the longitudinal direction; and and wherein the vibrations have a frequency is between 15 kHz and 80 kHz,