Abstract
This paper reports a method for producing high bulk polyethylene terephthalate (PET) filament yarns composed of shrink and nonshrink filament yarns. Normally, high bulk yarns are mainly made out of shrink and nonshrink staple fibers especially polyacrylonitrile through semi-worsted spinning process. The method described in this paper involves blending two PET filament yarns, one acting as shrink component and the other as nonshrink one, followed by a relaxation process. The amount of shrinkage of the shrink component can be regulated by the drawing ratio employed during the drawing of partially oriented PET yarn. Depending on the shrinkage of shrink component, a variety of high bulk PET continuous filament yarns can be produced. The method described in this paper has the advantage of a much shorter production route and production cost, when compared with the traditional semi-worsted spinning process. Some of the produced yarns showed a high similarity with the fancy boucle yarns.
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