Section Warping

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. 

With section warping, narrow warp sections of the desired length are wound parallel to each other onto a warping drum with the final thread density (Fig. 4.5). The slide-off of the warp sections is prevented by a conical arrangement. Many sections are deposited next to each other, until the whole width of the warping drum is filled. 

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. 

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Non-splashing lubricant for sectional warping of spun yarns, e.g. for Raschel/terry cloth. 

From the preceding information, it will be appreciated that in the production of woven filter fabrics, which are predominant in solid-liquid separation processes, there is a demand for a wide range of qualities. Because of this, the fabrics will be required in a variety of lengths and widths, therefore, the flexibility provided by section warping makes this the preferred warp preparation technique. 

Therefore, the thickness of a wafer can be deduced. Beyond this, and more importantly, the tool enables the roughness, referencing to the upper and lower probes, to be measured, which can be converted to the so-called flatness, bow, and warp. Flatness, warp, and bow are defined in the following sections. 

The circular cross-section of the warped potential energy surface (a) three wells of equal energy (b) tu wells of equal energy (c) one low energy well... 

Dry grit or sandblasting tends to warp thin-sheet materials these methods are suited only for thick section parts. 

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