Double knit

In figure 9 we see an 80 microgram sample of Burlington polyester fabric (textured fiber cut from a pick on a pair of double-knit slacks). Even in this small sample the processing temperature is apparent, and the double peak on the initial run indicates the material as polyester. The rerun after program cooling reveals a single peak and a flat pretransition baseline. 

Figure 9. Burlington double-knit polyester fabric...

Because these yams are being made in one less step and also within the plants spinning the parent product, this latest development may be said to constitute another advance in the industrial chemical technology of manu-factured-textile products. This draw-texturing appears to be especially applicable to polyester yams intended for fabrics known as double knits and textured wovens. ... 

Blended nonionic surfactants. Extremely low foaming detergent systems for removal of oils, lubricants and foreign materials from polyester double knit fabrics. Low foaming characteristics make these products suited for equipment where high turbulence is present. Extremely efficient between 90F and 140F. COG-500 is a lower concentration of COG. 

INTEX SOLVENT 244 is suggested as a prescour in the removal of mill oils and greases during preparation. Its principal use to date has been in the scouring of double knits to assist in removal of the mineral oil based coning lubricants used on the yarns prior to knitting. It is felt that the combination of solvent action and emulsifiers is an efficient means of removal. 

Actually, elastomeric knitted fabrics account for the highest proportion of commercial sportswear. The knitting technology involves warp knitting and circular knitting. The former relates to tricot, raschel, and double-needle-bar raschel the latter involves single knit, interlock, double knit, and rib knits. 

Double jersey machines The elastomeric fabrics produced by double-knit machines show distinct face and back stmctures. The fabrics with double or triple layers in some end uses can also be produced by the machines. All double-knit stitches, including double jersey, pique, French pique, ottomans, twills, needle outs, and flat back rib stmctures can be produced using elastic yams. The stitches have width or both width and length stretches using lay in, knit in, or plaiting carrier systems as mentioned above for the elastic yams in bare and covered types. 

Nike implemented a similar concept into a clothing system—a double-knit textile composed of a hygroscopic layer next to the skin, and a less hygroscopic layer on the outer surface was constructed into a tennis dress worn by Maria Sharapova at the 2006 U.S. Open. The garment featured a fish scale pattern on the back panel that opened up as the athlete perspired to increase local ventilation and maintain comfort. 

The majority of acrylic fiber production is 3 5 denier staple and tow, furnished undyed in either bright or semidull luster. The major markets are in the apparel and home furnishings sectors. Within the apparel section, these fibers find extensive use in sweaters, and in singleknit jersey, double-knit, and warp-knit fabrics for a variety of knitted outerwear garments such as dresses, suits, and children s wear. Large markets for acrylics in the knit goods area are hand-knitting yarns, deep-pile fabrics, circular knit, fleece fabrics, half-hose, coarse-cut knitwear, and deep-pile fabrics for blankets. 

Textile materials can be produced by a whole series of processes, for example, by weaving, knitting, or by fleece formation. Knitted fabrics have stronger elasticity than weaves and this was first used in the manufacture of wool jerseys and later found extensive application in what are known as double knits from polyester yarns. Fibers and filaments can also be made more elastic by a whole series of mechanical procedures such as, for example, crimping or giving a false twist to the yarn. 

The stability of a weft knit can be improved by inserting threads within a double knit construction (Figure 21.19) or by plating threads on the reverse side of a single knit fabric (Figure 21.20). To insert threads in the length of a weft knit does, however, require special machine attachments. 

Figure 21.19 Warp Inserted tows within a double knit weft construction. Source Reprinted from Raz S, Industrial Knitted Fabric Design and International Trends, IFAl, Boston, Nov 1992.

Bourrelet A double-knit fabric with raised loops ruiming horizontally across the surface of the cloth giving a rippled or corded effect. 

Dial dl(-o)l [ME dyaly fr. ML dialis clock wheel revolving daily mfr. L dies day] (15c) n. In a circular-knitting machine, a circular steel plate with radically arranged slots for needles. A knitting machine equipped with both a dial and a cylinder can produce double-knit fabrics. Tortora PG, Merkel RS (2000) Fairchild s dictionary of textiles, 7th edn. Fairchield Publications, New York. 

Double knit fabric (1895) n. A fabric produced on a circular-knitting machine equipped with two sets of latch needles situated at right angles to each other (dial and cylinder). 

Gaiting n. The spacing of the needles in the dial and cylinder in relation to each other on rib (double-knit) and interlock knitting machines. In rib gaiting, the dial needles are midway between the cylinder needles. For interlock gaiting the dial and cylinder needles are in direct alignment. 

Pique pi- ka [F pique, fr. pp of piquer to pick, quilt] (1852) n. (1) A medium weight to heavyweight fabric with raised cords in the warp direction. (2) A double-knit fabric construction knit on multifeed circular machines. 

Rib knit n, A double-knit fabric in which the wales or vertical rows of stitches intermesh alternately on the face and the back. In other words, odd wales intermesh on one side of the cloth and even wales on the other. Ribknit fabrics of this type have good elasticity, especially in the width. 

Dynamic moisture uptake, as a function of time, measured on fabric-film-fabric assemblies. Source ref. 51. (VC = cotton/cotton double-knit assembly, P/P = polyester/polyester assembly. 

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