| 摘要 |
Microspheres are incorporated into a mechanically-consolidated fleece material (1) from an aqueous liquor (3) in a foulard coating bath (2). The consolidated fleece comprises staple fibers. The material is stitch-bonded fleece or water-jetted fleece. It is made from polyethylene terephthalate, optionally mixed with viscose. The weight of the fleece is 100-600 g/m 2>. The aqueous liquor includes a dispersant, microspheres and a binder. The liquor is based on texturizing oil or coning oil. The binder is a thermoplastic. It is a phenolic resin dispersion binder. The mass ratio of binder to microspheres is 1:1. Fire-retardant and hydrophobic additives are included. The solids content of the aqueous composition is 15-25%. The mechanically pre-consolidated fleece material is fed into a bath (2). The fleece (6), now uniformly-coated, is passed through rollers (4). It then enters a continuous dryer (5). The rollers are under a pressure of 1.75 - 2.2 bar. The continuous dryer operates at 170-190[deg] C. On meeting hot air in the drying process, the microspheres are caused to expand. The dryer includes a stage of pre-drying by infra red radiation. |
