Abstract: A method for producing matrix material from thermoplastic wastes originating from communal and industrial rubbish. According to the method: a) the base material plastic waste is primary cleaned if necessary, depending on its solid contamination; b) after the possible primary cleaning step if necessary, the plastic waste is inputted into a recovering machine, where due to the pressure in the recovering machine and the heat transmitted to the material, the waste becomes a largely melted, nearly homogeneous and mostly fused mixture; c) the largely melted mixture is transferred into a heated internal mixing machine where the material is intensively mixed while adding heat; and d) if required, the melted material is transferred into a making-up machine, where matrix material blocks or matrix material products are produced. The invention relates also to the matrix material and the composite material produced from the matrix material.

Abstract: A flight distance of a competition javelin is improved and the tendency of the javelin to strike the ground leading point first by providing the javelin body so that it conforms to the competitive standards and by providing the body with surface roughening with a density of roughening points of at least 30 points/cm.sup.2 with a point height of substantially 0.1 to 0.5 mm. For men's competition the roughened surface is provided over a length of the body extending substantially 180 cm rearwardly of the grip. For women's competition, the entire surface of the javelin can be so roughened or the roughening can be provided only over a length of the body corresponding to the last 40 to 70 cm rearwardly of the grip.