Split film yarns

Filling yarn See split-film yarn and weft. 

From market point of view and from the structure of the fiber industry, the future for film fiber products may lie in the careful choice of application area, choosing applications where cheap fibrous materials or small-volume specialities are involved. In the tex range > 1, there is a huge application potential for split film yarns. Table 2 gives a selection of various applications. 

Table 1 Properties of monoaxial and biaxial warp knits of split-film and commingled yarns compared to woven fabrics of commingled yarns [5]...

Keywords use, application, chemical fiber, polypropylene fiber, monofilament, multifilament, staple fiber, tapes, spunbond, melt blown, split film, textile yarn, knitted fabrics, clothing, nonwoven fabric, home textiles, upholstery, geotextiles, agrotextiles, composites, medical textiles, automotive textiles, bulk continuous filaments (BCF), Eco-textiles, integrated fabric. 

The tape yarn and film method (initially called the split-film method or fibrillation of plastic films) consists of extruding or casting thin films or tapes of thermoplastic crystalline POs, followed by their stretching to obtain a substantially parallel orientation of the fiber-forming crystallites embedded in an amorphous matrix. Because the interchain bonds are missing, lateral cohesion is low and the films or tapes can be spliced very easily into a network of interconnected fibers (fibrillation). 

The production figures of polypropylene show impressive growth. The volume, which was less than 10 million lb in 1965, reached over 1.5 billion lb in 1990. This included approximately 17 percent filament yarn, 23 percent staple fiber, 18 percent spunbonded fabrics, and 38 percent split film products. 

The spinnability and spinning properties of a polymer are of the highest importance in the manufacturing of staple fibers and filaments. There are many analogies to the production of films, where breaks or splits are concerned. The frequency of yarn breaks determines the economic viability of the production process, as well as the competitiveness and the reputation of the manufacturer. Today, in the age of automation, it would be theoretically possible to manage the processing of the polymer with a minimum of staff if no yam breaks disturbed the processing. 

PBS is a typical thermoplastic and can be processed via various methods, such as extrusion, injection molding, film blowing, fiber spinning, and thermoforming. It has been reported that PBS can be processed into melt-blown, multifilament, monofilament, nonwoven, flat and split yarn, injection-molded products, film, paper laminate, sheet, and tape for applications in the textile and plastic industries. 

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