US 2004/0166442 A1Published application

Support for lithographic printing plate and presensitized plate

AssigneeFuji Photo Film Co., Ltd.

InventorsHirokazu Sawada, Akio Uesugi

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Abstract

The support for a lithographic printing plate obtained by performing graining treatment including electrochemical graining treatment on an aluminum plate, the aluminum plate is an aluminum plate which contains Fe of 0.02 to 0.29 wt %, Si of 0.03 to 0.15 wt %, Cu of 0.020 to 0.040 wt % and Ti of 0.050 wt % or less and whose remaining portion is composed of Al and unavoidable impurities. In addition, the support for a lithographic printing plate where surface area ratio and steepness obtained from three-dimensional data found with an atomic force microscope (AFM) each satisfies the specified conditions is excellent in printing performance (press life, scum resistance, sensitivity and cleaner press life or the like) and handling property (scratch resistance, fatigue fracture strength or the like) when the lithographic printing plate is prepared.

Claims21

Dependent claims

A support for a lithographic printing plate obtained by performing graining treatment including electrochemical graining treatment on an aluminum plate,

wherein said aluminum plate is an aluminum plate which contains Fe of 0.20 to 0.29 wt %, Si of 0.03 to 0.15 wt %, Cu of 0.020 to 0.040 wt % and Ti of 0.050 wt % or less and whose remaining portion is composed of Al and unavoidable impurities,
and wherein surface area ratio and steepness obtained from three-dimensional data by measuring 512×512 points in 5 μm×5 μm on the surface with an atomic force microscope each satisfies the following conditions (i) to (vi):
(i) Surface area ratio ΔS5 is 30 to 70%;
(ii) Surface area ratio ΔS5(0.2-5) is 10 to 30%;
(iii) Surface area ratio ΔS5(0.02-0.2) is 30 to 70%;
(iv) Steepness a455 is 20 to 50%;
(v) Steepness a455(0.2-5) is 5 to 20%;
and
(vi) Steepness a455(0.02-0.2) is 20 to 60%,
wherein ΔS5 which is found by the following equation from actual area Sx5 found by approximation three-point method from said three-dimensional data and geometrically measured area S05 is surface area ratio expressed by ΔS5=[(Sx5−S05)/S05]×100 (%)
ΔS5(0.2-5) which is found by the following equation from actual area Sx5(0.2-5) obtained by extracting a component with wavelength of 0.2 μm or longer and 5 μm or shorter from said three-dimensional data and geometrically measured area S05 is surface area ratio expressed by ΔS5(0.2-5)=[(Sx5(0.2-5)−S05)/S05]×100 (%);
ΔS5(0.02-0.2) which is found by the following equation from actual area Sx5(0.02-0.2) obtained by extracting a component with wavelength of 0.02 μm or longer and 0.2 μm or shorter from said three-dimensional data and geometrically measured area So5 is surface area ratio expressed by ΔS5(0.02-0.2)=[(Sx5(0.02-0.2)−S05)/S05]×100 (%);
steepness a455 is an area rate of a portion (area) having a slant with size of angle of 45° or bigger (gradient of 45° or bigger) to actual area Sx5 found by approximation three-point method from said three-dimensional data;
steepness a455(0.2-5) is an area rate of a portion (area) having a slant with size of angle of 45° or bigger (gradient of 45° or bigger) to actual area Sx5(0.2-5) found by extracting a component with wavelength of 0.2 μm or longer and 5 μm or shorter from said three-dimensional data;
and
steepness a455(0.02-0.2) is an area rate of a portion (area) having a slant with size of angle of 45° or bigger (gradient of 45° or bigger) to actual area Sx5(0.02-0.2) found by extracting a component with wavelength of 0.02 μm or longer and 0.2 μm or shorter from said three-dimensional data.

13 more elements

A support for a lithographic printing plate obtained by performing graining treatment including electrochemical graining treatment on an aluminum plate,

wherein said aluminum plate is an aluminum plate which contains Fe of 0.20 to 0.29 wt %, Si of 0.03 to 0.15 wt %, Cu of 0.020 to 0.040 wt % and Ti of 0.050 wt % or less and whose remaining portion is composed of Al and unavoidable impurities,
and wherein surface area ratio and steepness obtained from three-dimensional data by measuring 512×512 points in 50 μm×50 μm on the surface with an atomic force microscope each satisfies the following conditions (xi) to (xvi):
(xi) Surface area ratio ΔS50 is 30 to 70%;
(xii) Surface area ratio ΔS50(2-50) is 5 to 10%;
(xiii) Surface area ratio ΔS50(0.2-2) is 15 to 40%;
(iv) Steepness a4550 is 25 to 60%;
(xv) Steepness a4550(2-50) is 0 to 3.0%;
and
(xvi) Steepness a4550(0.2-2) is 10 to 40%,
wherein ΔS50 which is found by the following equation from actual area Sx50 found by approximation three-point method from said three-dimensional data and geometrically measured area S050 is surface area ratio expressed by ΔS50=[(S50−S050)/S050]×100 (%);
ΔS50(2-50) which is found by the following equation from actual area Sx50(2-50) obtained by extracting a component with wavelength of 2 μm or longer and 50 μm or shorter from said three-dimensional data and geometrically measured area S050 is surface area ratio expressed by ΔS50(2-50)=(Sx50(2-50)−S050)/S050]×100 (%)
ΔS50(0.2-2) which is found by the following equation from actual area Sx50(0.2-2) obtained by extracting a component with wavelength of 0.2 μm or longer and 2 μm or shorter from said three-dimensional data and geometrically measured area S050 is surface area ratio expressed by ΔS50(0.2-2)=[(Sx50(0.2-2)−S050)/S050]×100 (%);
steepness a4550 is an area rate of a portion (area) having a slant with size of angle of 45° or bigger (gradient of 45° or bigger) to actual area Sx50 found by approximation three-point method from said three-dimensional data;
steepness a4550(2-50) is an area rate of a portion (area) having a slant with size of angle of 45° or bigger (gradient of 45° or bigger) to actual area Sx50(2-50) found by extracting a component with wavelength of 2 μm or longer and 50 μm or shorter from said three-dimensional data;
and
steepness a4550(0.2-2) is the area rate of a portion (area) having a slant with size of angle of 45° or bigger (gradient of 45° or bigger) to actual area Sx50(0.2-2) found by extracting a component with wavelength of 0.2 μm or longer and 2 μm or shorter from said three-dimensional data.

13 more elements

Dependencies are inferred from the claim text.