Method and apparatus for dry lubrication of a thin slitting blade

摘要

A block of a solid lubricant material, such as PTFE, is biased continuously or intermittently against the cutting edge of a rotary slitting blade for corrugated paperboard. The solid lubricant block prevents the build up of starch adhesive and biasing movement compensates for wear of the block and wear of the cutting blade edge.

主权项

1. In an apparatus for slitting a running corrugated paperboard web including an annular rotary slitting blade mounted on a blade head on one side of the web for slitting engagement of the web supported on the other side by an anvil, a dry lubrication system for the blade cutting edge comprising:
a unitary block of a solid plastic lubricant supported on the blade head and biased radially inwardly into slitting contact with opposite blade faces defining the blade edge, wherein the solid plastic lubricant block is maintained in substantially uniform contact with the blade edge faces to compensate for wear of the block during slitting and wear of the blade edge from sharpening; a rectangular box housing that holds the block and that is pivotally attached to the blade head via a pivot shaft extending from the blade head to the housing, the housing being biased with respect to the blade head and pivotable about the pivot shaft with respect to the slitting blade independently of any pivotal movement of the blade head itself; and a biasing mechanism having a first end seated on the blade head and a second end seated on the housing, and providing a force to continually advance the housing and the block held therein radially inwardly toward the slitting blade to guide the blade edge in a planar path into and across the block and to maintain contact of the blade edge with the block as the block is penetrated by the slitting blade.