Staple fiber acetate

Synonyms cas 7783-47-3 hnflouride fluoristan stannous flouride tin bifluoride tin difluoride Staple Fiber Acetate... 

A feed roU appHes tension to the bundle of fibers to withdraw them from the extmsion cabinet. The product of one extmsion position is caUed a continuous-filament yam, as distinguished from staple. CeUulose acetate yams are generaUy produced in a weight range of 5—100 tex (45—900 den). 

Staple is produced by cutting a crimped tow into short lengths (usually 4—5 cm) resembling short, natural fibers. Acetate and triacetate staple are shipped in 180—366 kg bales, but production is quite limited. Conventional staple-processing technology appHed to natural fibers is used to process acetate and triacetate staple into spun yam. 

Acetic Acid. Methanol carbonylation has become the process of choice for production of this staple of the organic chemical industry, which is used in the manufacture of acetate fibers, acetic anhydride [108-24-7] and terephthaUc acid, and for fermentation (see Acetic acid and derivatives). 

Triacetate (filament I Acetate (fi lament and staple I See also Fibers Acetate. 

The purpose of acetalization in the manufacture of PVA fiber is to improve hot-water resistance of the heat-treated fiber further. In the production of monofilament, acetalization is somewhat omitted because the denier of monofilament is low and it can be heat-treated homogeneously at sufficiently high temperature. In the case of staple-fiber production, the total denier of the fiber bundle is high, so it is difficult to realize the homogeneous effect of heat treatment, and the process temperature has to be rather low to avoid local overheating. In most cases, consequently, acetalization is necessary. The conditions for acetalization are as follows ... 

Staple fibers contain many loose and broken ends which can be maintained low for weaving by what is known as sizing. The cheq>est and most effective sizing material is starch. However, starch must be used in relatively large amounts. In addition, it gels and so, produces high viscosities. As well as this, it can only be removed by enzymatic treatment. For these reasons, starch derivatives such as starch acetate or hydroxyethyl starch are now also used. 

Regenerated cellulosic fibers are made out of cellulose from wood or cotton lint. The most used fibers are viscose, acetate, cupro (very small quantity), and lyocell. These fibers are produced in various titers as filament (endless fiber) or staple fiber. 

Yarns and Fibers. Many different acetate and triacetate continuous filament yams, staples, and tows are manufactured. The variable properties are tex (wt in g of a 1000-m filament) or denier (wt in g of a 9000-m filament), cross-sectional shape, and number of filaments. Individual filament fineness (tex per filament or denier per filament, dpf) is usually in the range of 0.2—0.4 tex per filament (2—4 dpf). Common continuous filament yams have 6.1, 6.7, 8.3, and 16.7 tex (55, 60, 75, and 150 den, respectively). However, different fabric properties can be obtained by varying the filament count (tex per filament or dpf) to reach the total tex (denier). 

For staple, the heat-treated filaments in the form of tow are cut to prescribed lengths and then acetalized to develop crimp on individual cut fibers. A suitable finish is selected from conventional ones and appHed to the acetalized fibers to improve their spinnabiUty and other properties required for the intended use. 

Nonwoven Fabric. Crimped PVA staple is being used for the manufacture of dry-laid nonwoven. Also, as an example utilising the uniqueness of the fiber, a soft sheet is prepared by shrinking and pardy dissolving in hot water a nonwoven from water-soluble PVA fiber and then insoliibili ing the fabric by acetalization or similar processes. This sheet is used as car wipers, wipers for high grade furniture, and for similar purposes. 

Cellulose acetate Silica gel Scoured wool Sawdust Rayon waste Fluorspar Tapioca Breakfast food Asbestos fiber Cotton linters Rayon staple Starch Aluminum hydrate Kaolin Cryolite Lead arsenate Cornstarch Cellulose acetate Dye intermediates Calcium carbonate White lead Lithopone Titanium dioxide Magnesium carbonate Aluminum stearate Zinc stearate Lithopone Zinc yellow Calcium carbonate Magnesium carbonate Soap flakes Soda ash Cornstarch Synthetic rubber... 

Yarns and Fibers. Many different acetate and triacetate continuous filament yams, staples, and lows are manufactured. The variable properties are tex (wt in g of a 1000-m filamenit or denier [wt in g of a 9000-m filament), cross-sectional shape, and number of filaments. Individual... 

Establishments primarily engaged in manufacturing cellulosic fibers (including cellulose acetate and regenerated cellulose such as rayon by the viscose or cuprammonium process) in the form of monofilament, yarn, staple, or tow suitable for further manufacturing on spindles, looms, knitting machines, or other textile processing equipment. 

Cellulose acetate monofilament, yarn, staple, or tow Cellulose fibers, manmade Cigarette tow, cellulosic fiber Cuprammonium fibers Fibers, rayon Horeshair, artificial rayon Nitrocellulose fibers Rayon primary products fibers, straw, strips, and yarn... 

Fiber, rayon The generic term for fibers, staples, and continuous filament yarns composed of regenerated cellulose but also frequently used to describe fibers obtained from cellulose acetate or cellulose triacetate. Rayon fibers are similar in chemical structure to natural cellulose fibers (cotton) except that the synthetic fiber contains short plastic units. Most rayon is made using the viscose process. 

Other large volume applications for cellulose acetate fibers are filament yarns for ribbons for decorative packaging and tows for ink dispensers for felt tip pens. Cellulose acetate is used in nonwovens and in paper processes as staple and short-cut [87,88]. 

Triacetate fiber n. A manufactured fiber produced from cellulose triacetate in the forms of filament yarn, staple, and tow. Cellulose triacetate fiber differs from acetate fiber in that during its manufacture the cellulose is completely acetylated whereas acetate, which is diacetate, is only partially acetylated. A fiber may be called triacetate when not less than 92% of the hydroxyl groups are acetylated. Fabrics of triacetate have higher heat resistance than acetate fabrics and can be safely ironed at higher temperatures. Triacetate fabrics that have been properly heat-set (usually after dyeing) have improved ease-of-care characteristics because of a change in the crystalline structure of the fiber. Complete textile glossary. Celanese Acetate EEC, New York, 2000. Also see acetate fiber. 

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