Weave Patterns and Weave Types
Weave Patterns
The way the warp and weft threads interlace with each other is known as the weave pattern. The basic weave patterns are plain weave, twill weave, and satin weave, and the majority of woven products are created using one of these three.
The Plain Weave is the simplest weave pattern. Each weft is alternately placed above and below a warp thread, creating the characteristic cross (or checkerboard) pattern. Each unit cell contains two warp and two weft threads.
Twill Weave has a characteristic pattern with a diagonal rib. The weft thread runs (floats) over at least one, and then under at least one warp thread. The characteristic pattern is created by the offset (or weft shift) between successive weft threads.
In a Satin (or atlas) Weave, the weft thread runs (floats) over at least four warp threads before it passes under one. This leads to a very smooth structure whose appearance is dominated by the weft threads. Usually, an offset (weft shift) greater than 1 is chosen between the individual weft threads, so that no binding points lie next to each other.
Weave Types
In WeaveGeo, all three basic weaves can be generated according to three weave types: Regular, Dutch weave, and Reverse Dutch weave.
Regular
In the Regular (or square) weave, warp, and weft are bent around each other, resulting in a characteristic structure with rectangular meshes. Examples for all three weave patterns using the regular weave type are shown above.
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Dutch Weave
In a Dutch Weave, the warp threads are straight and do not deform. The weft threads bend around the warp threads. In this way, they can be placed close together giving a very dense, firm mesh with great strength in the weft direction. Usually, the warp threads are thicker than the weft threads.
Generally, Twill Dutch Weaves are more rigid than Plain Dutch Weaves and can carry higher loads. This weave type has smaller pores and lower permeability (flow velocity) than other Dutch weaves and allows to filter particles of fine diameter. It is thus widely used for industrial filtration.
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Reverse Dutch Weave
In the Reverse Dutch Weave, the warp threads bend around the straight weft threads. The pattern is reversed compared to Dutch weaves. The result is a strong weave in the warp direction. Due to the differences in the manufacturing processes, different technical properties can be achieved. Accurate and uniform pore sizes can be realized. It is used in applications requiring specific acoustic properties, mechanical robustness (petroleum industry) and high throughput for filtration (chemical, food, and pharmaceutical industry).
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