| 摘要 |
1,000,261. Embossing. DUNBEE-ELM Ltd. Oct. 31, 1961 [Oct. 31, 1960], No. 38988/61. Heading B5A. [Also in Division B6] A thermoplastic material is embossed to give a suede-like finish by pressing it against a hard embossing surface, the surface to be embossed and the other surface being wetted with liquid which is respectively relatively hot and relatively cold. As shown, vinyl plastic film or sheet 12 is fed between a heated, engraved embossing roller 10 and an unheated, rubber-surfaced impression roller 11. Troughs 14, 15 are mounted adjacent to the nip of the rollers and water is fed into the troughs through pipes 19, 20 respectively so that the water overflows from the troughs and wets both sides of the film 12 as it enters the nip of the rollers. The embossing roller is maintained at 325‹ F., the water in the trough 14 is heated to 85‹ F. and the water in the trough 15 has a temperature of 35‹ to 40‹ F. The temperature of the heated water may range from 70‹ to 150‹ F. and the difference in temperature between the two lots of water may range from 10‹ to 110‹ F. The liquid may be any, preferably volatile, liquid which is substantially inert with respect to and a non-solvent of the material being embossed, e.g. water, aqueous solutions containing surface-active organic materials which serve as " wetting agents," kerosene, the relatively high-boiling, non-viscous light lubricating oil fractions, alcohols, esters and fusel oils. A hydrophobic, surface-active material, e.g. silicon, may be coated on the embossing surface before use. The liquid may be applied to selected portions only of the material to be embossed with the result that the improved embossing effect is obtained at these areas only. Two embossing operations may be effected on the material to be embossed, the first embossing being so effected as to have a layer or film of the liquid in certain depressed portions of the design and the second embossing being particularly directed towards these depressed portions. Alternatively, the first embossing may be " dry," the liquid being applied between the two operations. In a modification the machine may be of the platen-type. |
