The operation of putting lines on blank or preprinted sheets

'Squareness' of trimmed paper is obtained by utilizing the ------------- component of the cutting machine.

Breaking of the fibers in paper or board to facilitate folding or bending 

In binding, the stitch at the top and bottom of the spine which connects each signature to the following one.

------------- involve the selective charging of a dielectric surface by exposure to an electron beam or discharging of a photo conductive surface by exposure to light 

--------------------- is the ink metering roll in flexographic process and is made of either steel or ceramic materials.