INFLUENECE OF PROCESSING CONDITIONS ON ABRASION AND HEAT RESISTANCE OF SCRIM REINFORCED NEEDLE PUNCHED NONWOVEN FOR BAG FILTER

摘要

In this study, the nonwoven fabrics were used as bag filter, which was fabricated by polyester fibers. The nonwoven fabrics for surface layers were manufactured by the polyester fibers of 2.22 dtex (2.0 denier), 1.67 dtex (1.5 denier), 1.33 dtex (1.2 denier), 0. 89 dtex (0. 8 denier), and 2. 22 dtex (2. 0 denier) polyester fibers, of low melting temperature. The nonwoven fabrics for surface layers were lapped with polyester nonwoven fabrics made of 2. 22 dtex polyester fibers and polyester scrim to form a sandwich structure. The basic weight of entire sandwich structural nonwoven was a constant for 500 g/m~2, but the fiber count, contents of low melting temperature fibers, basic weight, and thickness for surface layers nonwoven were altered. A sandwich structure was needle pouched at first and then thermal calendered to form a filter. The physical properties of the filter at different conditions were discussed. When the thermal pressing temperature was less than 130℃, the heat shrinkage ratio of the filter was less than 2%, and its shrinkage ratio of machine direction (MD) was lower than that of cross machine direction (CD) at the same time. The abrasion resistance of the nonwoven fabrics for surface layers was increased with the increased basic weight and thickness. When the basic weight of the nonwoven fabrics for surface layers was 100 g/m~2, the abrasion resistance increased about 10 ～70% compared with the basic weight of 50 g/m~2. As the thickness of the filter was 1.8 mm, the degree of abrasion resistance increased about 20 ～30% compared with the thickness of 1.2 mm.