A welt seaming lace assembly, for forming welted seams for upholstered furniture, formed of a thin, flexible, thermoplastic core covered with an open braided mesh formed of thread, and a heat reactable adhesive coating the thread and core, and a thin, thermoplastic, outer covering, including an integral sewing flange, hot extruded around the adhesive coated mesh covered core. The adhesive coating is applied hot to momentarily soften the core for both adhesively bonding to and partially embedding the thread in the surface of the core. Later, after cooling, the extrusion of the outer covering reactivates the adhesive for adhesively bonding the core and threads to and partially embedding the threads in the outer covering.
A finishing welt, comprised of a reinforcing polyethylene rod surrounded by a fabric scrim and an outer encasing layer of polyvinyl chloride, is formed in an extrusion-embossment method and apparatus. The method includes feeding a composite preform, consisting of the polyethylene rod and the scrim, first through an essentially key-hole shaped passageway in a core pin of an extruder crosshead and then into a chamber within the crosshead where plastic material under pressure flows onto the preform. Immediately thereafter, the preform is conveyed through an essentially key-hole shaped orifice, where the welt is formed by extrusion. Next, the opposed sides of the welt are sequentially embossed as the welt is conveyed over external peripheral embossing surfaces of two spaced rollers. The resultant welt is essentially key-hole shaped in cross-section, with the scrim surrounding the rod within the enlarged head portion of the welt and extending into the smaller depending flange portion. As a result of the extrusion step, the outer encasing layer of polyvinyl chloride is bonded through the scrim in the welt flange; and as a result of the sequential embossment, the outer surface of the welt is free of any significant longitudinal rib.
A method and apparatus are disclosed for manufacturing electrical connectors of the type comprising cylindrical elastomeric body having a flexible film wrapped therearound,the film having circumferentially extending conductors on its external surface. The manufacturing method includes the steps of feeding an endless length of body material and an endless length of film along paths which converge so that the film is against, and travels with, the body material. The film is progressively wrapped around the body material and the marginal edge portions of the film are bonded to each other. The endless length of film and body material is cut to produce the connectors seriation. The apparatus comprises a feeding means for feeding the film and body material through forming surfaces, a bonding means, and finally to a cutting means.
A finishing welt, comprised of a reinforcing polyethylene rod surrounded by a fabric scrim and an outer encasing layer of polyvinyl chloride, is formed in an extrusion-embossment method and apparatus. The method includes feeding a composite preform, consisting of the polyethylene rod and the scrim, first through an essentially key-hole shaped passageway in a core pin of an extruder crosshead and then into a chamber within the crosshead where plastic material under pressure flows onto the preform. Immediately thereafter, the preform is conveyed through an essentially key-hole shaped orifice, where the welt is formed by extrusion. Next, the opposed sides of the welt are sequentially embossed as the welt is conveyed over external peripheral embossing surfaces of two spaced rollers. The resultant welt is essentially key-hole shaped in cross-section, with the scrim surrounding the rod within the enlarged head portion of the welt and extending into the smaller depending flange portion. As a result of the extrusion step, the outer encasing layer of polyvinyl chloride is bonded through the scrim in the welt flange; and as a result of the sequential embossment, the outer surface of the welt is free of any significant longitudinal rib.
