Abstract: The invention pertains to a composite panel comprising a foamed thermoplastic core layer which is joined on both sides without adhesive to thermoplastic outer layers reinforced by fiberglass mats. The composite panel is used to make molded parts for motor vehicles.

Abstract: A continuous process is disclosed for producing a strip of decorated ski coating material from ultra-high molecular weight polyethylene. A 0.5 to 1.5 mm thick strip of ski coating material produced in a screw-type or piston-type extruding machine or by sintering followed by peeling and printed with thermodiffusion dyes continuously runs through a heating zone in which it is uniformly heated up to a temperature above 140.degree. C., so that the crystalline structure of the ultra-high molecular weight polyethylene is partially decomposed and the thermodiffusion dye diffuses into the molten ski coating material without the need for an intermediate carrier.

Abstract: A process and device are disclosed for producing glass fiber mat reinforced thermoplastic boards, as well as their advantageous use. Glass fiber mats are impregnated with molten thermoplastics and the composite glass fiber mat is then pressed. At least one of the glass fiber mats runs through the aperture of an impregnation nozzle controllably supplied with molten thermoplastics by extruders, forming two streams of molten mass that are applied at the outlet of the nozzle aperture on the top and on the bottom of the glass mats, pre-impregnating the glass fiber mat. These glass fiber mats thus pre-impregnated with thermoplastics runs through a gap between feeding rollers of a double belt press, are pre-calibrated then pressed by cooling plates into glass fiber mat reinforced thermoplastic board.

Abstract: A process is disclosed for transfer printing thermoplastic materials with thermal diffusion inks. An image is transferred in a heatable press from a paper substrate colored with thermal diffusion inks onto an intermittently moved, fiber-containing carrier material into which the thermal diffusion inks can at first be sublimated then diffused. This fiber-containing carrier material provided with thermal diffusion inks is then transported into the gap between the calender rollers, where it is continuously brought into contact with a thermoplastic melt at an increased temperature so that the thermal diffusion inks penetrate into the thermoplastic melt and at the same time a composite strip made of the fiber-containing carrier material and the thermoplastic melt is formed. The products obtained by this process are suitable for producing a decorative layer on parts of skis or snowboards and on composite materials made of fiber-reinforced plastics.

Abstract: The invention concerns a process for manufacturing a strip of ski-coating material made of polyethylene of ultra high molecular weight, wherein a ski-coating strip material 4 manufactured to a thickness of 0.5 to 1.5 mm by a screw extruder, a ram extruder or press sintering with subsequent peeling is made to pass continuously first through a heating zone 1 in which it is heated to temperature above 140.degree. C. and then through a cooling zone consisting of two sizing plates 2, 2' in which it is cooled to a temperature equal to or lower than ambient. This process produces a ski coating of which the crystalline proportion can be adjusted within a range of 25 and 60%, as a result of which improved gliding by the ski coating on snow and improved wax acceptance is assured in comparison with the known methods.

Abstract: The invention concerns a polyethylene-based ski coating containing up to 5%-wt of a fluorinated additive. This ski coating is especially suitable for making downhill and cross-country skis.

Abstract: A method for conditioning a racquet string which is tensioned to an elongation between 5 and 15% and in this state is wound on a spool. To implement this process, an untreated string segment is drawn off a supply drum and the end of the untreated string segment is affixed to the periphery of the spool. Thereupon the spool is moved away from the supply drum such that a specified winding length corresponding to the untreated string segment is tensioned to produce a predetermined elongation. While the tension is maintained, the elongated string segment, with simultaneous motion of the spool toward the supply drum, is then wound on the supply spool and lastly the second end of this string segment is affixed to the periphery of the spool.