Cotton fiber properties

Definition Soft white cellulosic substance composed of fibers surrounding the seeds of various plants (Genus Gossypium) It. powder of ground cotton fibers Properties Sp.gr. 1.6... 

Integration of PSD functions gives the textural characteristics of the samples (Table 8.9). The specific surface area (5 uw = 51.7 m /g. Table 8.9) of bleached flax fibers in contact with unfrozen bound water at 273 K is close to the specific surface area determined from the water sorption isotherm (5bexv,=46 m /g. Table 8.9). However, 5 bet,w for Ih incubated cotton. This difference in the bleached flax and cotton fiber properties can be explained by features in the fibers... 

Relationship of Cotton Fiber Properties to Yarn Tenacity... 

Improved Com fort Properties. Wear comfort generally means cotton-like properties. The abiUty to absorb moisture from the skin and the softness of cotton fabrics are considered to be the two key properties for comfort. The extremely fine denier of cotton fibers accounts for its softness. 

An important chemical finishing process for cotton fabrics is that of mercerization, which improves strength, luster, and dye receptivity. Mercerization iavolves brief exposure of the fabric under tension to concentrated (20—25 wt %) NaOH solution (14). In this treatment, the cotton fibers become more circular ia cross-section and smoother ia surface appearance, which iacreases their luster. At the molecular level, mercerization causes a decrease ia the degree of crystallinity and a transformation of the cellulose crystal form. These fine stmctural changes iacrease the moisture and dye absorption properties of the fiber. Biopolishing is a relatively new treatment of cotton fabrics, involving ceUulase enzymes, to produce special surface effects (15). 

Currently, HVI systems are providing rehable information on six characteristics of quaUty from a cotton sample in approximately 30 s that are highly related to the spinning quaUty and market value of the cotton. As of the 1991 crop year, cotton must be tested by HVI to be eligible for price supports in the United States. Information on every bale of cotton should gready improve the marketing of cotton and encourage the production of cotton with fiber properties desired by users. 

Most of the pectin ia the cotton fiber is ia the primary wad. Removal of the pectic substances is accompHshed by scouting, which does not change the properties of the cotton greatiy. 

Sugar(S), 23 435-492, 24 224. See also Specialty sugars bulk density of, 23 439t chemical properties of, 23 441—444 composition of, 23 443t, 449t, 4 696. See also Carbohydrates in cotton fiber, 8 19t crystallization, 23 449 determination of components in, 23 477-478... 

Fiber properties of the unwashed and washed cottons were similar, as determined by standard methods (Table II). 

Fiber Properties of Cottons Washed by Batch Process ( 3) Fibrograph... 

Fiber Properties of Cottons Washed on Rayon Wash Line,... 

Fiber Properties of Mississippi, California, and Texas Cottons — Rayon Wash Line, Second Experiment... 

The dyeing of polypropylene fibers, being an item of research for decades, is successfully accomplished with partially stearate-modified hyperbranched polyesteramides. The long alkyl chains ensure compatibility with the polypropylene matrix. The mixing-in of hyperbranched polyesteramides via extrusion affected neither the melt spinning process nor the final polypropylene fiber properties. The modified fibers are dyeable under standard conditions as are, e.g., polyesters or cotton. They can even be used for printing for example a picture pattern on a polypropylene carpet. 

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