Dummy plate precursor for planographic printing and method for producing printed plate and dummy plate
View Patent ↗The present invention provides a method for producing a planographic printing plate and a dummy plate for planographic printing in a CTP plate-making system, the method including: taking one product out of a pile of multiple planographic printing plate precursors piled up on a base substrate and a pile of multiple dummy plate precursors for planographic printing piled up on another base substrate, distinguishing the kind of the one product, exposing the one product to an infrared ray when the one product is a planographic printing plate precursor, and developing the one product when the one product is other than the base substrate, wherein the base substrate surface, the planographic printing plate precursor, and the dummy plate precursor for planographic printing each have a different absorption maximum in a range of 350 to 700 nm and an absorbance at the absorption maximum of 0.2 or more.
1. A method for producing a planographic printing plate and a dummy plate for planographic printing in a CTP plate-making system, the method comprising:
taking one product out of a pile of multiple planographic printing plate precursors piled up on a base substrate and a pile of multiple dummy plate precursors for planographic printing piled up on another base substrate,
distinguishing the kind of the one product with a color sensor,
when the one product is a planographic printing plate precursor, exposing the one product to an infrared ray, and subsequently developing the exposed one product, and
when the one product is a dummy plate precursor, developing the one product,
wherein a colored surface of the base substrate on which the pile of multiple planographic printing plate precursors is piled up, a colored surface of the base substrate on which the pile of multiple dummy plate precursors for planographic printing is piled up, the planographic printing plate precursor, and the dummy plate precursor for planographic printing each have a different absorption maximum in a range of 350 to 700 nm and an absorbance at the absorption maximum of 0.2 or more so that the presence or absence of the photographic printing plate precursor or the dummy plate precursor can be recognized, and
wherein an interleaving paper that is different from the base substrate is placed between plates of the pile(s) of the planographic printing plate precursors and/or the dummy plate precursors.
2. The method according to claim 1 , wherein the absorption maximum of the planographic printing plate precursor is in a range of 500 to 600 nm, the absorption maximum of the dummy plate precursor for planographic printing is in a range of 350 to 450 nm, and the absorption maximum of the surface of the base substrate on which the pile of multiple planographic printing plate precursors is piled up and the absorption maximum of the surface of the base substrate on which the pile of multiple dummy plate precursors for planographic printing is piled up are in a range of 400 to 550 nm.
3. The method according to claim 1 , wherein the base substrate on which the pile of multiple planographic printing plate precursors is piled up and the base substrate on which the pile of multiple dummy plate precursors for planographic printing is piled up comprise a colored cardboard.
4. The method according to claim 2 , wherein the base substrate on which the pile of multiple planographic printing plate precursors is piled up and the base substrate on which the pile of multiple dummy plate precursors for planographic printing is piled up comprise a colored cardboard.
5. The method according to claim 1 , wherein the dummy plate precursor has an absorption maximum in a range of 350 to 450 nm.
6. The method according to claim 5 , wherein each dummy plate has a non-photosensitive layer that includes a dye having an absorption maximum at 350 to 450 nm.
7. The method according to claim 6 , wherein the dye is selected from the following S-1 to S-6:
8. A method for producing a planographic printing plate and a dummy plate for planographic printing in a CTP plate-making system, the method comprising:
taking one product out of a pile of multiple planographic printing plate precursors piled up on a base substrate and a pile of multiple dummy plate precursors for planographic printing piled up on another base substrate,
distinguishing the kind of the one product with a color sensor,
when the one product is a planographic printing plate precursor, exposing the one product to an infrared ray, and subsequently developing the exposed one product, and
when the one product is a dummy plate precursor, developing the one product,
wherein the entire base substrate on which the pile of multiple planographic printing plate precursors is piled up the entire base substrate on which the pile of multiple dummy plate precursors for planographic printing is piled up, the planographic printing plate precursor, and the dummy plate precursor for planographic printing each have a different absorption maximum in a range of 350 to 700 nm and an absorbance at the absorption maximum of 0.2 or more so that the presence or absence of the photographic printing plate precursor or the dummy plate precursor can be recognized, and
wherein an interleaving paper that is different from the base substrate is placed between plates of the pile(s) of the planographic printing plate precursors and/or the dummy plate precursors.