Fiber slitting

Activated Carbon Fibers (Slit-Shaped Pores)... 

Novoien . [BASF AG] Folyprt ylene for inj. molding and extrusion, automotive parts, elec, engineering, pkg., pharmaceuticals, medical technology, fibers, slit film yams, monofilaments. 

MAJOR APPLICATIONS Fiber, slit tape, cast and biaxially oriented film, containers and closures, automotive interior trim, appliance housings and components, component in elastomeric blends with polyethylene and olefinic rubbers. 

Film-fiber method Split fiber (or split-film fiber) Slit fiber (or slit-film fiber) Fibrillated film fibers... 

X-Ray Fiber slit, a Fraunhofer diffraction pattern will be observed through... 

Slit-Film Fiber. A substantial volume of olefin fiber is produced by slit-film or film-to-fiber technology (29). For producing filaments with high linear density, above 0.7 tex (6.6 den), the production economics ate more favorable than monofilament spinning (29). The fibers are used primarily for carpet backing and rope or cordage appHcations. The processes used to make slit-film fibers are versatile and economical. 

The equipment for the slit-film fiber process is shown in Figure 15 (29). An olefin film is cast, and as in melt spinning, the morphology and composition of the film determine the processing characteristics. Fibers may be produced by cutting or slitting the film, or by chemomechanical fibrillation. 

The film is fibrillated mechanically by mbbing or bmshing. Immiscible polymers, such as polyethylene or polystyrene (PS), may be added to polypropylene to promote fibrillation. Many common fiber-texturing techniques such as stuffer-box, false-twist, or knife-edge treatments improve the textile characteristics of slit-film fibers. 

Figure 18.14 The diffraction pattern of helices in fiber crystallites can be simulated by the diffraction pattern of a single slit with the shape of a sine curve (representing the projection of a helix). Two such simulations are given in (a) and (b), with the helix shown to the left of its diffraction pattern. The spacing between the layer lines is inversely related to the helix pitch, P and the angle of the cross arms in the diffraction pattern is related to the angle of climb of the helix, 6. The helix in (b) has a smaller pitch and angle of climb than the helix in (a). (Courtesy of W. Fuller.)...

A particularly simple case is the study of a fiber in the slit-focus camera, if the fiber is stretched out along the slit direction [31,62,63]. In this case the transversal structure according to Bonart [16] (cf. Sect. 8.4.3) is directly measured, as is established by change of variables S —> s, (fiber parallel to the slit) s2,s —> S 2 (fiber symmetry assumed)... 

Thus, information concerning size and arrangement of domains in the cross-sectional plane of the fiber are accessible with classical laboratory equipment. Moreover, since the projection /(s) 2 (sn) is complete and a normalization /(s) 2 (sn) —> /(s) 2 (S12)/V to absolute intensity units is readily established by employment of the moving slit device2 without the need to resort to a secondary standard, the invariant... 

Materials PP fabric prepared from highly oriented film-slit fibers. 

Fibers are commercially made from uniaxially drawn film. The film is extruded, slit into tapelike strips, drawn, fibrillated, and wound. As in the case of spinning, the drawing produces preferred alignment of the polymer chains along the axis of pull. If the drawing precedes slitting, the fiber gives some cross orientation and is less apt to split. 

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