| 摘要 |
PROBLEM TO BE SOLVED: To have required permeability and blocking of earth and sand particles, provide large rupture strength and strong stability for ultraviolet rays and contrive increase of durable years by making the outermost surface layer of multiple cloth layers comprising a plurality of layers to be the cloth layers having ultraviolet stability, and blocking an ultraviolet ray for the cloth layers of the lower layers than the layer. SOLUTION: For instance, the engineering sheet has three-structural multiple cloth layers having an outermost surface layer cloth 2 possessing ultraviolet stability and lower layer cloth layers 3, 4 not executing ultraviolet stability processing. Each cloth layer 2-4 is made the woven cloth of the multi-filament yarn of a synthetic fiber such as a nylon, polyester or vinylon of large chemical resistance, and the thickness of a filament and a multi-yarn is selected in accordance with application. The outermost surface layer cloth layer 2 is made a black raw liquid colored fiber, the whole fiber is made the black raw liquid colored fiber in a thread comprising the fiber or only a winding thread wound around a core thread is made a covering thread comprising the black raw liquid colored fiber, and the sleeve part of a core sleeve structural thread is made the black raw liquid colored fiber. |
