Process Description (exemplary With The Power-Heat-Set Process)
In the Power-Heat-Set process yarn is heat set with superheated steam in an open system at atmospheric pressure. All the materials normally used in the carpet industry such as polyamide 6, polyamide 6.6, polypropylene, Acrylic, PET, polyester and wool can be processed.
The unprocessed yarn is provided on packages in a creel (up to 48 packages). At a speed of up to 700 m/min, the yarn is pulled off the packages and entered into the heat setting process. There are two basic ways of transportation of the yarn through the process. One way is to place the yarn in coils or a “figure 8 pattern on a belt or to wrap it onto ropes arranged as a polygon in order to convey it through the process. With Frieze yarns only belt conveying is utilized. Frieze is produced by a special stuffer box, the so-called Twinroll-Box (TRB). The heat setting process takes place at temperatures between 110 °C and 200 °C in a steam-air-mix. After heat setting, the yarn is cooled and wound onto packages again at the winder. In general a heat setting machine consists of six lines at eight ends (fibers) each. A daily production of up to 10.5 tons is possible.
Read more about this topic: Heatsetting
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