| 摘要 |
PURPOSE:To prevent the lowering in a treatment amount by water passing resistance by making a weft yarn hard to raise even if the back surface of filter cloth is slid with each part of an apparatus, by forming raised extremely fine fibers with a thickness of 0.1-10mum to the surface of a satin fabric base material by directly raising said base material. CONSTITUTION:The surface of a base material comprising a satin fabric made of a synthetic fiber is covered with extremely fine fibers with a thickness of 0.1-10mum obtained by directly raising the weft yarn of said base material mainly to the warp yarn direction to form a filter layer by said raised fiber. The satin fabric is pref. formed by levitating 3-8 weft yarns per one warp yarn. Further, it is necessary that the stratified degree of the base material shown by formula I is 1-2. The weft yarn comprising a multifilament formed by collecting 200-50,000 extremely fine fibers with a monofilament thickness of 0.1-10mum and the warp yarn comprises a multifilament formed by collecting 10-100 temporary twisted processed yarns or modified cross-section yarns with a monofilament thickness of 10-25mum.
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