| 摘要 |
PURPOSE:To keep a draining characteristic for long periods by using a draining material made of a composite consisting of a plastic sheet having through holes in the tops of its cross section where hollow recessions and projections are alternately continued and a hydrophilic cloth. CONSTITUTION:A draining material is made of a composite material formed by covering a hydrophilic cloth 6 on a perforated uneven sheet 1, where the cloth 6 is bonded at a joint portion 7. For the sheet 1, the shape, positional form, and dimensions of the projection are freely selected, cavities 5 and 5' and tops 2 and 2' are formed, and through holes 4 and 4' are formed to connect the surface and back sides. By setting the holes 4 and 4', the cross-sectional area of the upper and lower cavities 5 and 5' can effectively be used as water paths. A draining material having high pressure resistance and filtering characteristics and also having good draining characteristics for long periods can be obtained.
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