| 摘要 |
PURPOSE:To prevent breakage of a base fabric, by a method wherein plural lines of reinforcing materials are disposed along the longitudinal direction of the base fabric, and the reinforcing materials on both sides are more densely arranged in the direction of width than those at a central part. CONSTITUTION:Reinforcing materials 6, made of thread bundle, such as polyester multifilament, are disposed parallel to each other at given intervals on a base cloth 2, consisting of fabric such as polyetylene monofilament, along a longitudinal direction. The reinforcing materials 6-1, disposed on the side part subsequent to an overlapping margin part 7 of the base fabric 2 and on the side opposite to said side are more densely arranged than the reinforcing materials 6-2 disposed on both inner sides and reinforcing materials 6-3 disposed at a central part. This causes the side parts to have higher tensile strength than that at the central part, resulting in the possibility to endure to a tension, strongly exerted on the side parts during lifting, and prevent breakage of the base fabric. |
