English to French Tech/Engineering Printing & Publishing presse

explanation: this is the description of the features of the surface of a roller used to contact the continuous paper as it passes through the machine. ‘Plain’ means a smooth finish, (sometimes we cut grooves – a little like tyre tread), ‘Parallel’ means the roller diameter is constant (sometimes they are very slightly smaller in the middle called double reverse taper – like some bobbins – to centralised the paper)