Commingled yarns thermoplastic

Nonreactive thermoplastic pultrusion utilizes completely polymerized plastics in various preprocessed states such as powder, granulates, filaments, or solutions. The use of preimpregnated fibers is advised due to short flow paths. These preimpregnated fibers can be fed into the pultruder as commingled yarns, thermoplastically coated yarns or tapes. Since impregnation is already done, no impregnation device is needed. Instead, due to the low thermal conductivity of the matrix material and its limited deterioration temperature. 

Aramid fiber is also used in production of reinforced thermoplastics (RTPs), as commingled yarns or a hybrid yarn or fabric, suitable for high drapabihty and coping with very sharp fillet radii, and in specialty tires. 

Commingled yarn ko- mig-gol, ka- (ca. 1626) V. In aerospace textiles, two or more continuous multifilament yarns, the filaments of which have been intermixed with each other without adding twist or otherwise disturbing parallel relationship of the combined filaments. Usually consists of a reinforcing yam, such as graphite or glass, and a thermoplastic matrix yarn. 

Svensson, N., Shishoo, R. and Gilchrist, M. (1998) Manufacturing of thermoplastic composite from commingled yarns - a review, /. Thermoplast. Composite Mater., 11, 22-56. 

A complex shaped-reinforced thermoplastic composite part made of commingled yarns with an integrated sensor... 

Another important application of thermoplastic fibers such as poly ether ether ketone (PEEK), Poly etherimide(PEI), and VectranM andHS (Vectranis the trade mark of Hoechst liquid crystalline polymer) is in making thermoplastic matrix composites. Commingled yams of the reinforcement and matrix such as quartz/PEEK, glass/PEI, Vectran HS/M are used to make the composites wherein the matrix yarn fuses to form the continuous phase of the composite. 

Recently, new compounding methods have been investigated to produce long, natural fiber-reinforced thermoplastic pellets and improve composite mechanical properties [31, 32]. For example, pellets have been formed by melt impregnation of continuous natural fiber yarns by pultrusion followed by cooling and chopping. Another method involves commingling of continuous forms of natural and synthetic fibers that are then heated, consolidated, and chopped. 

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