Method of making an intaglio halftone gravure printing plate
AssigneeDai Nippon Insatsu Kabushiki Kaisha
InventorKatsusuke Nagano
Life of this patent
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Abstract
An intaglio halftone gravure printing plate is made by contact-printing onto a sensitized carbon tissue a contact screen including a grid-like arrangement of minute dark dots each having the shape of a square rounded off at the four corners with the peripheries vignetted and having densities tapering from a maximum value of 3.0 at the center to a minimum value of 0.1 at the periphery, contact-printing a halftone positive onto the carbon tissue, contact-printing a light diffusion sheet and the halftone positive combinedly onto the carbon tissue, and developing the treated carbon tissue on a printing plate for subsequent etching of the cylinder.
Claims12
A method of making an intaglio halftone gravure printing plate comprising the steps of:
- contact-printing onto a sensitized carbon tissue a contact screen including a grid-like arrangement of minute dark dots each having the shape of a square rounded off at the four corners with a vignetted periphery and having densities tapering from a maximum value of 3.0 at the central part to a minimum value of 0.1 at the periphery;
- contact-printing in registration a halftone positive onto the carbon tissue;
- superposing a light diffusion sheet and the halftone positive on the carbon tissue in the order named, and contact-printing in registration the light diffusion sheet and the halftone positive combinedly onto the carbon tissue;
- said steps being carried out in any desired order;
- applying the thus treated carbon tissue to a printing plate to develop the tissue thereon;
- and
- etching the printing plate to obtain the halftone gravure printing plate.
Dependencies are inferred from the claim text.