Yarns extrusion

DOFF A set of full bobbins produced by one machine (a roving frame, a spinning frame, or a manufactured filament-yarn extrusion machine). 

In particular, it has been shown that the most important factor determining the drawing conditions of fibers and films of i-PP is the structure (a or mesomorphic) which characterize the yarn or the film obtained by extrusion. The drawing from mesomorphic samples requires, indeed, a lower tension and, generally, higher draw ratios are obtained [125,126],... 

Nylon blends, dyeing, 9 204 Nylon block copolymer, 19 762 Nylon carpet fibers, stain-resistant, 19 764 Nylon-clay nanocomposites, 11 313-314 Nylon extrusion, temperatures for, 19 789t Nylon feed yarns, spin-oriented, 19 752 Nylon fiber(s), 24 61 production of, 19 740 world production of, 19 7654 Nylon fiber surfaces, grafting of polymers on, 19 763-764... 

Spinnerets, for olefin fiber extrusion, 22 627, 630-631, 11 231-232 Spinner flasks, 15 691-692 Spinning. See also Solution spinning Yarn spinning technologies air gap, 11 209 of continuous-filament yarns,... 

The drying unit can be extended to a solid-state postcondensation, i.e., drying and solid-state postcondensation occurs in one process stage. Thus, high viscosity chips for industrial yarns, films and extrusion molded parts can be produced. 

Another important class of extruded materials consist of filaments and yarns. These are produced by spinning, which is the extrusion of molten material through fine holes in a spinneret. After passing through the spinneret the filaments cool, either in air or in water. If single-filament material is required, as for instance with nylon fishing line, the different filaments are wound up separately. If a textile yarn is required finer filaments produced simultaneously are twisted together before wind-up. 

There are variations of the spinning process that have not been mentioned here, e.g., bicomponent spinning. Usually, this operation is carried out by employing two extrusion systems that keep the resins separate until just before the streams exit the spinneret. Sheath-core or side-by-side yarns can be spun by this process. Simpler bicomponent yarns are spun with mixed incompatible resins from mixed-pellet blends. 

The steps beyond filament extrusion are diverse and are usually proprietary. The yarns are pulled from the spinneret, perhaps by air jets, given an electric charge, and are then laid down on a moving screen. Alternatively, the yarns may be pulled away by rolls and drawn between a set of rolls before they are fed to the air jets. In the former case, the yarns are usually only partially oriented, even though they are stretched at very high speeds. After they are formed, the fabrics are thermally bonded by calendering, or needle-punched, or chemically bonded. For information in the patent literature, the reader should see Gillies [181]. 

Besides dull yarn, black fiber is also produced. It is produced in a similar manner to that of dull-yarn production by adding 2% (based on the weight of cellulose acetate) of very finely dispersed carbon black with an average particle size of 12 pm to the extrusion dope [35]. 

The deaerated dope is metered by positive displacement pumps to hundreds of individual yam extrusion positions from the manifold. It is necessary to have a separate pump for each spinneret position to ensure uniform fiber formation and denier. Good control and maintenance of the metering pumps are necessary to produce uniform, high-quality yarn products. Moelter and Steele [35] commented that, although the principal of extrusion is simple in conception, the precision of the operation reflects the ingenuity of its engineering. 

Chem. Descrip. Tridecyl stearate CAS 31556-45-3 EINECS/ELINCS 250-696-7 Uses Drawing and heat-setting lubricant fortextile/industrial filament yarns, plastic extrusion, magnetic tapes, metalworking, coatings and inks (mar and slip agent)... 

Uses Emollient for cosmetics, creams/lotions, pharmaceuticals thickener, vise, control agent, pigment dispersant for cosmetic creams/lotions, bath preps. dye carrier, lubricant for textile/industrial filament yarns, fiber finishes textile surfactant lubricant for plastics processing and extrusion magnetic tapes Manuf./Distrib. DelCon St. Lawrence Trade Names Lexolube B-109... 

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. 

The first development toward a continuous process was the combining of extrusion and drawing for melt-spun fiber. This became possible with the development of high-speed take-up of up to 4000 m/min. Extrusion occurs at about 1000 m/min, and yarn then runs directly into a 1 4 draw zone with the fully drawn output wound at the new 4000 m/min speed. This yarn is then conventionally textured using one of the methods presented earlier. 

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