| 摘要 |
1,035,846. Seaming non-metallic sheet material. A. WINDMÍLLER and M. GENNERICH, [trading as WINDMÍLLER & HÍLSCHER]. April 5, 1963 [Nov. 24, 1962], No. 13649/63. Heading B5K. The edges of supported juxtaposed layers 5, 6 of thermoplastic material are welded together by applying heat in a direction substantially along the layers and substantially perpendicular to the edges which, while being heated, are unsupported externally for such a distance perpendicular to the edges that the material adjacent to the supports is never heated above its softening point. In one embodiment, Fig. 1, clamping jaws 1, 2 at room temperature and liquid cooled pressing jaws 7, 8 are provided. In use, the layers 5, 6 are positioned to abut a liquid-cooled stop rail 11, the jaws 1, 2 are closed, the rail 11 is lowered, a heating bar 13 is moved in the direction of the arrow 14 to heat the edges of the layers 5, 6 by radiation, Fig. 2 (not shown), the bar 13 is retracted, the jaws 7, 8 are closed to compress the seam whilst simultaneously the rail 11 returns to the position of Fig. 1 to assist in the cooling, Fig. 3 (not shown), and the jaws 1, 2 and 7, 8 are then retracted. In another embodiment, Figs. 4 and 7, to seam the edges of tubular web sections 101 moving continuously transversely to their longitudinal axes, the sections 101 are fed between two moving endless metallic bands 103, 104 so that the end of each section to be seamed projects beyond the side edges thereof. The projecting ends are trimmed to the desired length by a rotating knife 105 and as the sections move past the continuously heated, thermostatically controlled, sealing tool 106 a bead-like seam is formed. Cooling elements 107, 108 are resiliently urged towards each other so that the bands 103, 104 apply pressure to the seam. Cooling rollers 109, 110 and 111, 112 are provided and also apply pressure to the seam. Tensioning rollers 113 for the belts 103, 104 are provided. In a further embodiment, Figs. 8 and 9 (both not shown), also for sealing the ends of tubular webs, knives 115, 116 and welding tools 117, 118 are provided for trimming and sealing, respectively, both ends of a web. Steel belts 119, 120 and 121, 122, guided by rollers 136 and passing over cooling drums 126, 127, are provided for each end of the web and conveyers 123 and 125, both sets co-operating with conveyers 124, feed the webs to and from, respectively, the welding apparatus. Rollers 128, 130, 131 are also designed as cooling rollers. |
