Warp beam

Metap weave-knit process n. A technique combining weaving and knitting in one operation with two independent yarn systems wound on warp beams. In the fabrics produced, woven strips are linked together with wales of stitches. Generally the fabrics have 75-85% woven and 25-15% knitted structure. 

Section beam n. (1) A large, flanged roll upon which warp yarn is wound at the beam warper in preparation for slashing. (2) Small flanged or unflanged beams assembled side-by-side on the shaft of a warp beam for further processing. 

Tight or loose end n. A taut or slack warp end caused by too much or too little tension on an individual end while weaving, by ridgy section or warp beams, by incorrect tensions in beaming or sizing, or as a result of faulty fabric design. 

Knitted fabrics are categorized as either weft or warp . Weft fabric is faster and more economical to produce and the process can be accomplished with a single yarn package. The warp knitting process, on the other hand, requires a warp beam, that is, a running sheet of yarns, similarly to weaving. Loops are formed transversely in the weft process and essentially vertically in the warp process (Fig. 1.14). Simplest or plain weft knits tend... 

In 1899 Friedrich Wever and Carl Seel, both located in Barmen, Germany, suggested a loom to weave shaped fabrics for human busts or corsets (Wever and Seel, 1899). The usual warp beam was replaced by a creel for feeding warp ends with individual length. Key components were a curvilinear reed and a shaped breast beam, which could be replaced by alternative beams having other shapes. 

Many thousands of ends are needed to weave a thick wide panel. Creels that can accommodate such a large number of ends are very expensive and occupy a lot of space. In these cases, warp beams are used for the X or 0° fibers, and a creel is used for the Z fibers. A combination of beams and creels can be used for tapered and complex structures. 

II = warp beam connector 12 = gas outlet 13 = water 14 = acid ... 

The 100m functions in the following manner. The warp beam is connected to a let-off mechanism that meters the warp yarns off the beam as fill insertion proceeds. Each yarn in the warp passes through metal warp stop mechanisms that can detect broken warp yarns, through the eyes of heddles that are contained in the various harnesses used to lift the warp yarns, through the reed used to beat-up the filling yarn, and finally onto... 

A woven fabric consists of two or more thread systems that are perpendicular to each other warp threads and weft threads. The warp threads run in the machine direction and are wound on the warp beam in the desired number and thread density (Section 4.4). 

All of these principles use a bobbin creel from which the warp threads are drawn. Weaving from the creel or direct beaming of the warp is used less frequently, as the total number of warp threads Is restricted by the capacity of the bobbin creel. With warping or section warping, the warp beam is obtained after several production steps, and only a small number of bobbins are required. 

For warping, a portion of the total number of threads is wound on a warp beam across the entire width (partial warp beam). Several warp beams are rewound together onto the final warp beam. This procedure is called assembling. It is often combined with a sizing process. This procedure is preferably used for large lots with simple designs because the number of patterns produced by the warp is restricted. 

After section warping, the warp threads are rewound from the warping drum onto the warp beam. The potential for patterns is unlimited, which makes this procedure suitable for smaller lots and for complicated warp designs. 

Figure 4.13 shows the principle of a weaving loom valid for hand looms as well as modern weaving machines. The warp threads are drawn off the warp beam and redirected into the weaving plane at the back rail. Functions of the back rail (back rest) are... 

Warp stoppers are positioned between the warp beam and the shafts. 

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