A procedure for manufacturing tubes with plastic materials and metal soul and variants to introduce in injectors for their application (Machine-translation by Google Translate, not legally binding)

摘要

Process for the manufacture of tubes with plastic materials and metallic core and variants to be introduced in the injectors, for their application that consists essentially of advancing a metallic spiral through the central part of the injector of plastic materials, so that it goes out through the mouthpiece of the same, at the same speed as the tube is formed, which will be achieved by placing it on an axis whose surface has been carved a groove that forms a spiral of the same step with which to rotate the shaft, the spiral will be pushed by the mechanical effect of the screw pitch. (Machine-translation by Google Translate, not legally binding)