cannot fall short of a minimum pressure this minimum pressure is predetermined by adjustment the pressure adjusting screw 46 by which a minimum distance between the first surface 42 and second surface 44 is always maintained in operation a user sets on a suitable operation panel 48 the pressure gauge to e g 1 bar and then brings the pressure adjusting screw up by hand until hand tight then the pressure adjusting screw can be locked in that position once running a recommended pressure setting can be set under normal operating conditions this recommended pressure setting could be between 1 bar and 2 5 bar which the operator can read from the manometer display 50 therefore the pressure adjusting screw is used to preset a setting pressure whereas the running pressure is achieved via the pneumatic or hydraulic pressure system feeding the cushion 40 each embossing roller has normally but not exclusively two product roll widths the brackets of each neighbouring embossing roller unit abut each other so as to minimize the gap between each embossing roller imprint typically there will be a 30 mm gap between each emboss roller each embossing roller unit is on a flexible mount which can move laterally so as to accommodate uneven wear in the roller surface each unit can be hydraulically or pneumatically controlled so as to adjust pressure to each individual unit this means that wear and anvil roller flexing can be compensated for easily the embossing technique utilises an existing system of ply bonding wheels these are mounted on the machine between the normal emboss section and the perforation head instead of having a large steel embossing roller there are several small steel rollers engraved with.