| 摘要 |
PURPOSE:To fully exhibit antistatic performance by a method wherein after laminating polyethylene sheet like raw fabric or tubular raw fabric sheet which does not contain an antistatic agent in both surface layers, the crosslinking extent thereof is decreased toward the center in a thickness direction of the raw fabric, and it is strectched in one direction. CONSTITUTION:A polyethlene sheet like raw fabric or a tubular raw fabric which contains an antistatic agent in a middle layer and, however, does not contain the antistatic agent in both surface layers, which consists of a homopolymer of ethylene or a copolymer of ethylene and alpha-olefin, is used. For those fabrics, a method in which the sheet like raw fabric is made by extrusion from a T-die, a method in which the tubular raw fabric is made by extrusion from a ring die, etc., are used. Then, after lamination to three layers, crosslinking is performed so that the extent of crosslinking decreases to the center from both sides in a thickness direction of the raw fabric. Thereafter, though it is stretched at least in one direction, corona discharge treatment and or ageing treatment are performed after stretching. |
