| 摘要 |
888,369. Laminating. REEVES BROS. Inc. Jan. 14, 1958, No. 36091/61. Divided out of 888,367. Class 140. [Also in Group XI] Apparatus for laminating a layer or web of polyurethane foam to a layer or web of flexible backing material, e.g. fabric, canvas or paper, comprises means for feeding the layer or web of polyurethane foam into contact with and partially around the periphery of a rotatable drum, an elongated heater constructed to produce a heating zone of ribbon form and serving to render adhesive a surface of the polyurethane foam at a first point arcuately spaced in the direction of rotation of the drum from the point of contact of the layer or web of polyurethane foam with the drum, means for feeding the layer or web of backing material into contact with the adhesive surface of the polyurethane foam at a second point arcuately spaced from the first point in the direction of rotation of the drum, means for maintaining the polyurethane foam and the backing material on the periphery of the drum so that the layers or webs are caused to adhere and adjust to each other during the period of setting of the adhesive surface as they travel around the drum, and means for guiding the laminated product away from the drum. As shown, a web 215 of polyurethane from supply roll 219 passes over a braked roller 221 and through an edge-guiding and lateral tensioning device 233 to the drum 229. The backing web 216 from the roll 244 passes round the braked roller 246 and the idler roller 254 to the drum 229. The polyurethane is heated on its surface by impingement of a flame from the gas burner 262. The drum 229 is preferably cooled, e.g. by circulating water within it. The web 216 may be preheated by a heater 271 e.g. of the electrically-operated air-blast type, and may be spread and laterally tensioned in the same way as the polyurethane layer. The laminated product travels round a substantial arc of the drum 229, and then over the guide roll 255, to the winding-up roll 256. The product is tensioned on the drum 229 by driving the roll 256 to have a higher peripheral speed than the drum. Instead of the flame from the gas burner 262, the surface of the polyurethane foam may be heated by an electrically-heated rod or blade in contact with it. Specification 888,368 also is referred to. |
