IMPROVEMENTS IN OR RELATING TO THE PRODUCTION OF LINES OF SEPARATION IN A SHEET OR OTHER MEMBER

摘要

At least one line of separation is formed in a sheet or other member (44) by moving a heated point ( 4a) of a tool (1a) in contact with the surface of the member (44). The tool (1a) may be mounted in a mounting arrangement (40) for use in supporting the tool ( 1a) on a head (41) of an apparatus for moving the tool. By means of the heated point, smooth clean lines of separation can be formed in the sheet or other member, in particular in the photographically opaque layer of a bilaminated plastics sheet for enabling part of the opaque layer to be removed to produce a mask for selective exposure, for example in the making of a printing plate and for contacting film.