pen for compressed in a form for the manufacture of a kunststoffteils, form and process technology using such a pen and the other composite.

摘要

The injector (20) is constituted by a tubular sleeve (24) is fixed in a wall (5) of the mold and by a needle valve (32) is engaged in a fixed position in the internal bore of the sleeve (24). The needle valve (32) is provided with a duct for supplying pressurized gas (37) communicating with an annular injection chamber (40) which is delimited between the inner surface of the sleeve (24) and the external surface of the needle valve (32). The end part (24a) of the injector projects inside the recess (8) of the mold. In this end portion of the injector, the annular injection chamber (40) has a very small width corresponding to the radial clearance between the sleeve (24) and the needle valve (32). The diametrical clearance between the sheath and the needle in the end part of which is close to 0,050 mm. The mould may comprise at least one injector (20) whose end part projects into a cavity (27) of an embodiment of a reinforcing rib of the part. The gas under pressure can be injected during the phase of injecting the plastic material in the recess (8). The piece of plastics material may comprise reinforcing ribs hollow.