√ The insulated heating elements are cast into semi-circular or flat aluminum blocks, which are machined to match the surface to be heated.
Breaker Plate - 1. This is performed metal disk, with a multitude of small diameter holes. 2. The breaker plate is placed in between the screw and the die assembly. 3. It's principal function is to provide support for the screen pack . 4. The breaker plate helps also to convert the spiral flow of the polymer melts leaving the screw into a linear, axial one. Screen Pack - 1. Screen Pack is usually a multilayered, nearly symmetrical sandwich of metallic wire screens. 2. It is placed between the screw and the breaker plate, using the latter for physical support. It's role is to eliminate the particulate contaminants. 3. The screen pack composition is always based on trade-offs, there is need to eliminate particulates using screens with high mesh, but at the same time this create flow restriction, it reduced the throughput, thus low mesh would be preferred. 4. Decision should be made as for as the maximum tolerable size of the particulate contaminan