PROCEDURES AND PROCEDURE FOR THE PREPARATION OF CONVENTIONS

摘要

A tool for producing convexities in a plate, comprising a first (12) and a second (13) roller, where at least one roller (12, 13) has a plurality of raised parts (17) arranged in a row along a straight line and at least one roller has a plurality of recesses (16), the raised parts (17) on the first roller (12) fitting into the recesses (16) on the second roller (13). The rollers are designed to roll the plate to be thinner in areas outside of the convexities.