Abstract: In a method for winding round the button stem of a button sewn by a sewing thread to an article of clothing, in which a winding thread made from an elastomeric plastic is wound on under tension onto the thread bundle formed from sewing thread between the button and the article of clothing, in a simpler manner a reliable fixing of the winding thread end is brought about in that the winding thread, following the wrapping of the thread bundle, is drawn off the stem in a direction roughly at right angles to the axis with a tension increased to beyond its yield point, before the separation thereof at the button stem. The thread end extending over several coil turns is firmly fixed between the previously placed coil turn as a result of its diameter greatly reduced by complete elongation. Two embodiments of an apparatus for performing the method are also described and the apparatus is constructed as a compact, esily handleable hand-operated device.

Abstract: The method of manufacturing a composite pipe includes extruding an inner pipe from a polyethylene or polyethylene copolymer mix having a cross-linking agent such as peroxide homogeneously dispersed therein. The extrusion takes place below the decomposition temperature of the agent to prevent cross-linking. Thereafter, an outer jacket is positioned over the inner pipe and the composite pipe is heat treated, usually in coil form, at a temperature to cause cross-linking of the inner pipe. A positive gas pressure is maintained in the pipe during heat treating at least until the cross-linking has progressed sufficiently to prevent the pipe from collapsing. The outer jacket acts as the reinforcement and maintains the shape and inside diameter of the inner pipe during processing under pressure.