| 摘要 |
PURPOSE: To obtain paper for filter bags by calendering a non-woven paper of laminated structure comprising a layer based on synthetic fibers and a layer of cellulose fibers between a heated cylinder having projections and a smooth cylinder. CONSTITUTION: A non-woven paper 112, which is superposed a layer based on synthetic fibers such as polyethylene and a layer of cellulose fibers, is introduced between a support structure 130 comprising a heated cylinder 140 made of a metal having projections and a smooth cylinder having a flexible surface wound rubber around, and to perform to a calendering finish at a temp. of the prescribed heated cylinder 140 of a range of 140-300 deg.C and under a pressure between the heated cylinder 140 and the prescribed support structure 130 per 1 mm width of a range of 15-45 N. By this calendering, a width of the region of the prescribed synthetic fibers become 0.1-5 mm, preferably 0.1-2 mm, more preferably about 1 mm to prepare paper suitable for filter bags. |
