| 摘要 |
<p>A process for dyeing composite synthetic material having a porous polyurethane matrix and a fiber reinforcement (e.g. nonwoven fabric, polyamide, polyethylene or polyester fibers) embedded in the matrix, and from which to produce a sheet product similar to natural leather. The entire section of the material, consisting of the porous matrix and reinforcement, is treated with dyeing substances (hot-polymerizable plastic resins with a water or organic base, pigments, premetallized azoic dyes) by alternately winding the composite material, in strip form, on and off two opposed rollers and through a tank containing a bath of the dyeing substances in solution or emulsion form, so as to feed the strip of composite material reciprocatingly through the bath. The rollers and tank may be housed in a pressurized container for operating at temperatures of over 100 DEG C. <IMAGE></p> |
