Societa Cavi Pirelli S.p.a.

Andrea Borroni

Gianmario Lanfranconi

Carlo Marin

A granulator for forming granules of cross-linkable plastic compounds in which a screw extruder extrudes the compound into the smaller diameter end of a funnel-shaped, annular conduit, the other end of the conduit facing a die with circular arrays of through-holes. The compound which passes through the through-holes is cut into granules by rotating blades having air nozzles which remove particles of the compound from the blades. The granules are received in a chamber from which they are removed pneumatically. Where the annular conduit meets the die, there are channels within and outside of the arrays of through-holes which lead to the outside of the granulator and which provide conduits for removal of compound which does not directly impinge on the entrances of the through-holes which are specially shaped to avoid accumulation of the compound between the through-holes.

Granulator for cross-linkable plastic

In the laying-up of the cores of a multiple core cable in which the cores travel from a plurality of auxiliary platforms rotatably mounted on a main, rotatable platform to a laying-up member, the platforms are rotatable by separate motor drives, one for each platform, and the cores operate position sensors intermediate the auxiliary platforms and the laying-up member so as to speed up or slow down the motor drives for the auxiliary platforms dependent upon the positions of the cores as they pass from the auxiliary platforms to the laying-up member thereby eliminating residual torsion in the cores of the cable.

Growing community of inventors

Carimate, Italy

Andrea Borroni