Machine rolling hot plastic extrudate to sharply-defined linear optical prism-grooved strip, has low thermal inertia cylinder-matrix working against thin metal pressure band, with air nozzles for excellent tempering control

摘要

The cylindrical forming-matrix is mounted on roller end plates turning on a roller axis (4). The internal backing roller (5), smaller in diameter than the cylinder matrix, provides it with support near the feed (25) roller. Thus the matrix runs eccentrically with respect to the backing roller Preferred features: The matrix may be considered to comprise in two parts, a carrier cylinder which need not be metal, and the actual matrix around it. Hot or cold compressed air is blown from nozzles, to control temperature in relevant zones of the matrix cylinder. They also blow against the steel band, in the space behind it. Roller axes are mounted in a stand, with adjustments. Transverse thermal expansion of the cylinder matrix is accommodated by conical surfaces on the fixed- and spring-loaded end plates