JPS62181190A - Production of aluminum alloy base for planographic plate - Google Patents

Abstract

PURPOSE:To obtain a high-grade aluminum alloy printing plate, by subjecting an ingot of an aluminum alloy containing predetermined amounts of Mf, Fe, Si and Cu to predetermined soaking, hot rolling, annealing, cold rolling and refining annealing. CONSTITUTION:An aluminum alloy containing 0.35-0.9% of Mg, 0.05-0.5% of Fe, up to 0.2% of Si and up to 0.05% of Cu, the remainder being Al and unavoidable impurities, is soaked, and is hot rolled. The hot-rolled plate is annealed at 300-520 deg.C for at least 30min, is cold rolled, is then heated in a continuous annealing surface at a temperature of not lower than 460 deg.C for not more than 10min, is cooled to or below 100 deg.C within 1min, is subjected to final cold rolling with a reduction of area of not less than 50%, and is subjected to refining annealing in a batch furnace or a continuous annealing furnace. A base for a planographic plate thus obtained has an excellent uniformity of a roughened surface, is less susceptible to contamination of non-printing areas, is capable of preventing generation of streaks, and has excellent fatigue strength and tensile strength. Accordingly, a planographic plate having excellent characteristics can be obtained.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an f-plate printing plate which is formed by roughening and anodizing, and further coating a photosensitive substance. More specifically, it is a lithographic printing plate that has excellent tensile strength and fatigue strength, has a uniformly roughened surface through electrochemical roughening treatment, and has a beautiful appearance with no streaks. The present invention relates to a method of manufacturing an aluminum alloy support for use in the present invention.

(Prior Art) Conventionally, aluminum plates or aluminum alloy plates (hereinafter referred to collectively as aluminum plates) have been widely used as supports for JI printing plates, and as typical examples of such printing plates. There is also a so-called PS board, which is made by coating a photosensitive material on an aluminum plate that has been subjected to surface treatments such as surface roughening treatment and anodic oxidation coating treatment, and then drying the coated aluminum plate.

As such an aluminum plate for 7th edition printing, JIS
1050 (Pure AL with purity of 99.5% by weight or more), J
IS 1100 (A view -0.05~0°'), Q
% Cu alloy), JIS 3003 [A 9.
-0,05~0,20% Clay%Cu-1,5 modified%Mn alloy (Hereinafter, when expressing the composition, weight% is expressed as tF%
(abbreviated as )] Aluminum plates with a cap thickness of 0.1 to 0.81 ul are commercially available. Also, JP-A-58-427
No. 45, No. 59-133355, 1ij160-58
There is an aluminum plate disclosed in No. 61 So, No. 60-63346, etc.

Among these, aluminum alloy plates are generally used as supports for printing on the 41st edition, as they have excellent surface treatment properties, hardness, and corrosion resistance, as well as a wood-friendly surface. It is a suitable material.

The surface of this aluminum alloy plate is roughened by a mechanical method, a chemical method, an electrochemical method, or a combined process on a tool, and then preferably anodized. The surface is then finished by applying a photosensitive agent. The aluminum alloy plate coated with this photosensitive agent is then subjected to plate-making processes such as exposure and development to form a printing plate on which the image area M is formed, which is then wrapped around the cylindrical plate cylinder of a printing machine and adhered to the non-image area. It is well known that the ink is applied to the printed area in the presence of dampening water, transferred to the rubber blanket, and printed on the paper surface.

Therefore, aluminum alloy plates for printing plates are required to have the following basic properties.

(1) To make the adhesion of the photosensitizer uniform and improve the adhesion,
In particular, a uniform roughened surface can be easily obtained by electrochemical roughening treatment.

(2) Electrochemical surface roughening treatment does not generate streak structures (streak-like unevenness) and provides a beautiful appearance.

(3) The plate is attached by bending both ends and wrapping it around the plate so that it is inserted into the groove of the cylindrical plate cylinder.Printing is performed by applying ink to the plate rotating at high speed and then pressing it against a rubber blanket to transfer the ink. , the bending part is constantly subjected to repeated stress, and it has excellent fatigue resistance that can withstand this stress.
Must have tensile strength.

(4) Surface water retention is sufficiently high to prevent staining of non-image areas.

(Problems to be Solved by the Invention) However, in recent years, there has been a demand for aluminum alloy printing plates with higher standards in terms of the above characteristics. In other words, as described in Japanese Patent Application Laid-Open No. 58-58-1, the stress applied to the printing plate has increased due to the high speed, long-run printing rim II, etc. in recent 47-plate printing, making it easier to print. I tend to get tired. If the strength of the printing plate is insufficient, the parts fixed to the plate cylinder may be deformed or damaged, causing problems such as printing misalignment, or the plate may break due to repeated stress, resulting in poor tensile strength and fatigue strength. Further improvement is expected in this respect. In addition, since large numbers of copies are printed, requirements are becoming stricter in terms of stains in non-image areas, and it is necessary to improve the corrosion resistance of aluminum plates to make stains less likely to occur (for example, it is necessary to improve the corrosion resistance of aluminum plates). 1986-
215727).

In addition, the above-mentioned electrochemical surface roughening treatment (e.g.,
63902), streak-like irregularities called streaks occur, impairing the aesthetic appearance and often lowering the commercial value of the printing plate. This is l between hot rolling buses.
Coarse recrystallized grains of oOpm or more are generated, and their outline remains even after the final cold rolling, and appears as a fibrous structure extending in the rolling direction by electrochemical roughening treatment. .

However, the conventional aluminum plate described in 1-1 has advantages and disadvantages as shown in the table below, and none of them satisfied the requirements described in 1-1.

(One step to solve the problem) The present inventors conducted extensive research to overcome the drawbacks of the conventional aluminum alloy printing plate supports, and found that Mg, Fe, Si , Cu (containing aluminum alloy ingots are subjected to predetermined soaking treatment, hot rolling, and annealing, followed by cold rolling, annealing and rapid cooling in a continuous annealing furnace, and then final cold rolling. It has been discovered that an aluminum alloy plate that satisfies all of the above required properties can be obtained by rolling or further temper annealing after final cold rolling.The present invention has been made based on this knowledge. It is something.

That is, the present invention provides Mg 0. :15-0.9%, F
e0905~0.5%, Si0.2% or less, Cu 0.
After soaking an aluminum alloy consisting of 0.05% or less, the balance being Al and unavoidable impurities, it is hot rolled, and the hot rolled plate is annealed at a temperature of 300 to 520"C for 30 minutes or more and then cold rolled. The material is heated in a continuous annealing furnace to a temperature of 460°C or higher within 10 minutes, cooled within 1 minute to a temperature of 100°C or higher, and then subjected to final cold rolling with an area reduction of 50% or higher. Manufacturing method of aluminum alloy support for 11th printing plate and M g 0. :15-11.9
%, F e 0-05~11.5%, 5i (1,2%
After soaking an aluminum alloy consisting of CuLl, 0.5% or more, and the balance Al and unavoidable impurities, it is hot-rolled, and the hot-rolled plate is annealed at a temperature of 300 to 520°C for 30 minutes or more, and then cooled. Inter-rolled.

Next, it is heated in a continuous annealing furnace at a temperature of 460"C or higher for less than 10 minutes, and then cooled to 100"C or less within 1 minute.
After final cold rolling with an area reduction rate of 50% or more, further cold rolling at a temperature of 120 to 250°C for 30 minutes or more in a Hatchi furnace.
Alternatively, the present invention provides a method for producing an aluminum alloy support for a printing plate in a printing section, which comprises performing temper annealing for 120 seconds or less at a temperature of 150 to 420° C. in a continuous annealing furnace.

First, each component in the aluminum alloy used in the present invention will be explained.

Mg is in the range of 0.35 to 0.9%. Mg is mostly dissolved in Al and improves tensile strength and fatigue strength without impairing the uniformity of the roughened surface due to electrochemical roughening treatment.

If it is less than 0.35%, the tensile strength will be as low as 1, and if it exceeds 0.9%, the uniformity of the rough surface will be impaired.

Fe is in the range of 0-05% to 0.5%. Fe has the effect of making the electrolytically roughened surface uniform. Fe combines with other elements in aluminum alloys, forming Al-Fe system or A-type
It is an element that forms Fe-Si-based eutectic compounds, and these eutectic compounds are effective in making recrystallized grains finer and forming uniformly fine electrolytically rough surfaces. If the Fe content is less than 0.05%, the WL refinement of recrystallized grains and the uniform fineness effect of the electrolytically roughened surface will be small, and if the Fe content exceeds 0.5%, the effect will be adversely affected due to the formation of coarse compounds. The electrolytically roughened surface becomes non-uniform.

The content of Si is 0.2% or more. Si is contained as a normal impurity, and if it exceeds 0.2%, the uniformity of the rough surface will be impaired and stains will easily occur in non-image areas.

The content of Cu is 0.05% or more. Cu is contained as a normal impurity, and if it exceeds 0.05%, the uniformity of the rough surface is impaired and stains in non-image areas are likely to occur.

The unavoidable impurities in the alloy used in the present invention are M
n, Cr, Zn, etc., and there is no problem if the content is 0.05% or less.

Furthermore, in the present invention, it is preferable to add Ti and B to refine the ingot structure. The amount added is Ti0.05%
Hereinafter, B 0.01% or less is suitable.

Next, a method of processing the above aluminum alloy will be explained.

First, the molten metal of the above composition is U-shaped and soaked (
(preferably at 450 to 600°C for 3 hours or more) and hot rolling is performed. It is preferable to perform hot rolling at a temperature of 500 to 200°C. This hot rolled plate is annealed at a temperature of 300 to 520°C for 30 minutes or more to completely recrystallize. At this time, if the temperature is less than 300°C or the time is less than 30 minutes, recrystallization will be insufficient, and if it exceeds 520°C, the crystal grains will become coarse, which is unsuitable. Then cold rolling (preferably 20
% or more), then heated to a temperature of 460°C or higher in a continuous annealing furnace, held for less than 10 minutes, and then rapidly cooled to a temperature of 100°C or less within 1 minute. By this heating, alloying elements such as Mg, Si, and Cu are re-dissolved, and the uniformity of the roughened surface in the electrochemical roughening treatment and the strength can be improved. At the same time, this heating causes fine (
Recrystallization with a grain size of 30 ILm or less) is generated. The +If crystal annealing treatment applied immediately after hot rolling, and the non-recrystallization treatment applied in a continuous furnace after cold rolling, are performed twice to completely eliminate the outline of coarse grains generated between hot rolling baths. This is to completely eliminate the streak structure in the cold-rolled sheet by eliminating the streak structure, that is, obtaining fine recrystallized grains with completely random orientation.

The reason why the heating conditions for continuous furnaces were specified as continuous is as follows. That is, at temperatures below 460° C., the Irg solid solution effect of the alloying element is not sufficient, and when held for more than 10 minutes, the recrystallized grains become coarse and elongated, impairing the uniformity of the rough surface. The purpose of cooling to a temperature of 100° C. or lower within 1 minute is to suppress the generation of precipitates such as elemental Si that impair the stain resistance of the non-image area as much as possible.

The plate obtained in this way has a reduced area of -(l) or more than 50%4-
It is cold rolled to become In the final cold rolling of y, the eutectic compounds of the A-cross-Fe system and the A-Fe-3i system are dispersed, and the crystal structure becomes uniform. If this area reduction rate is less than 50%, the compound will not be sufficiently dispersed and the crystal structure will be non-uniform.
A uniformly roughened surface cannot be obtained during surface roughening treatment. Is the cold-rolled plate obtained in this way sufficient to achieve the object 1.1 of the present invention as it is, or if the fatigue strength is to be further improved, it may be subjected to temper annealing as described below. It is effective to apply That is, at a temperature of 120 to 250 °C in a pouch furnace for 30 minutes or more, preferably 60 to 300 minutes, or for 150 minutes in a continuous annealing furnace.
The temperature is ~420℃.

Rapid temper annealing is performed for 120 seconds or less, preferably for 5 to 60 seconds.

When the temperature of the above-mentioned temper annealing conditions is 120 when using a batch furnace
If the temperature is less than 250°C or the treatment time is less than 30 minutes, a sufficient effect of improving fatigue strength will not be obtained, and if the temperature exceeds 250°C, a 1rg crystal phenomenon will occur, resulting in a decrease in tensile strength and fatigue strength. When performing temper annealing in a continuous annealing furnace, 1
If the temperature is less than 50℃, sufficient fatigue strength cannot be obtained from several pieces.
If the temperature exceeds 420°C or the treatment time exceeds 120 seconds, the tensile strength and fatigue strength will decrease.

The aluminum alloy plate for lithographic printing plates of the present invention produced as described in 1- below has a uniform pit shape and appropriate surface roughness equivalent to JIS 1050 aluminum alloy by surface roughening treatment, and has improved water retention in non-image areas. It has excellent strength and stain resistance, has tensile strength and fatigue strength equal to or higher than JIS 3003 aluminum alloy, and has a beautiful appearance with no streaks at all.

Next, a method for surface treating a lithographic printing plate support according to the present invention will be explained in detail.

The method of sand in the present invention is electrochemical sand in hydrochloric acid or nitric acid electrolyte 11. & Electrochemical sand II☆:
method, and scratch the aluminum surface with a metal wire.
Mechanical sanding methods such as the wire brush grain method, the pole grain method in which the aluminum surface is grained with an abrasive ball and an abrasive, and the brush grain method in which the surface is sanded with a nylon brush and an abrasive can be used. , any of the above-mentioned sand methods can be used alone or in combination.

The grained aluminum is chemically etched with acid or alkali. When an acid is used as an etching agent, it takes a long time to destroy the fine structure, which is disadvantageous in industrially applying the present invention, or the etching process can be improved by using an alkali as an etching agent.

The alkaline agents suitably used in the present invention are: 1. Y
sodium hydroxide, sodium carbonate, sodium aluminate, sodium metasilicate, sodium phosphate, potassium hydroxide, lithium hydroxide, etc., and the preferred range of concentration and temperature is 1 to 1, respectively.
50%, 20~Zoo℃, and the amount of dissolved Al is 5~2
Preferably, the conditions are such that 0 z / m'.

After etching, the surface is washed with alcohol to remove any remaining dirt (smut). The acids used include nitric acid, sulfuric acid, phosphoric acid, chromic acid, hydrofluoric acid, and porhydrofluoric acid. In particular, for smut removal treatment after electrochemical surface roughening treatment, JP-A-33-12739T is preferable.
; 1 at a temperature of 50 to 90°C as described in the publication
These are a method of contacting with sulfuric acid of 5 to 651 Tj +1'L% and a method of alkali etching as described in Japanese Patent Publication No. 48-28123 t;-.

1. Can the aluminum plate treated as described above be used as a support for the printing plate? Is it preferable to further perform treatments such as anodic butyric coating treatment and chemical conversion treatment as necessary? .

The anodic oxidation treatment can be performed by a method conventionally used in this field. Specifically sulfuric acid.

When direct or alternating current is passed through aluminum in an aqueous or non-aqueous solution containing phosphoric acid, chromic acid, oxalic acid, sulfamic acid, benzenesulfonic acid, etc. or a combination of these two types, positive JAM formation occurs on the surface of the aluminum support. It can also form a film.

The processing conditions for anodic oxidation vary depending on the electrolyte used.
Generally speaking, the electrolyte concentration is 1-80%, the liquid temperature is 5-70°C, the current density is 0.5-60 ampere/dm', and the voltage is 1-80%. 100V
, an appropriate electrolysis time range of 10 to 100 seconds.

Among these anodic oxide coating treatments, the British Patent No. 1,
It is used in the invention described in No. 412,768. Preferred methods include anodic oxidation in sulfuric acid at high current density and anodic butylation using phosphoric acid as an electrolytic bath as described in US Pat. No. 3,511.661 III.

The anodized aluminum plate is further described in U.S. Patent No. 2,
No. 714,066 and US Pat. No. 3,181.461, the treatment may be carried out by dipping in an aqueous solution of an alkali metal silicate, such as sodium silicate, or as described in US Pat. No. 3,860,426. A coating layer of hydrophilic cellulose (eg, carboxymethyl cellulose, etc.) containing a water-soluble metal salt (eg, zinc acetate, etc.) can also be provided, as described in the literature.

L of the printing plate support for the printing plate section according to the present invention.

A photosensitive f-plate printing plate can be obtained by providing a conventionally known photosensitive layer as a 28-plate photosensitive layer.

The f-plate printing plate obtained by plate-making processing has excellent performance.

The composition used in the photosensitive layer L includes the following.

■A photosensitive layer consisting of a diazo resin and a binder containing a diazonium salt and a reactive carbonyl group such as aldol or acetal as disclosed in U.S. Pat. Nos. 2,063,631 and 1,667,415!
l? Diphenylamine-p, which is a reaction product with mixture i
- Condensation product of diazonium salt and formaldehyde (
A so-called photosensitive diazo resin) is preferably used. Other useful condensed diazo compounds are listed in Japanese Patent Publication No. 49-48001.
No. 49-45322-1, No. 49-45323, etc.

These types of photosensitive diazo compounds are usually obtained in the form of water-soluble inorganic salts and can therefore be coated from aqueous solution.

Or these water-soluble diazo compounds are
By the method disclosed in Publication No. 7, the reaction product is reacted with an aromatic or resinous compound having one or more phenolic water groups, sulfonic acid groups, or both. Water-insoluble photosensitive diazo resins can also be used. It can also be used as a reaction product #&,S with hexafluorophosphate or tetraroborate as described in JP-A-56-121031. Other British Patent No. 1312925
Also preferred are the diazo resins described in the patent specification.

<Photosensitive layer comprising a 10-quinonediazide compound Particularly preferred 0-quinonediazide compounds are 0-naf1 to quinonediazide compounds, for example, US 4 yen 1; 1 2'yea
txs+-3, same No. 2767092 So, same No. 27729
No. 72, No. 2859112t), No. 2907665
-3-1 Same No. 3046110, same No. 3046111 Gin, same No. 3046115 Gin, same No. 3046118 So, same No. 3046119, same No. 3046120, same No. 304
No. 6121, No. 3046122, No. 304612
No. 3, No. 3061430, No. 3102809,
Same No. 3106465, Same No. 3635709, Same No. 3
It is described in numerous 111-line publications, including the specifications of No. 647443, and these can be suitably used.

■Azide compound and binder (photosensitive layer consisting of a polymer compound) For example, British Patent No. 1235281, British Patent No. 149586
In addition to the compositions comprising the Ashi 1 compound and a water-soluble or alkali IIf-soluble polymer compound described in the specifications of No. 1 and JP-A-51-32331 and JP-A-51-36128, JP-A No. No. 50-5102, No. 50-8
4 3 0 2 -3, il 5 0 - 8
4303-1 and 53-12984-2, the compositions include a polymer containing 1 to acyl groups and a polymer compound as a binder.

(4) Other photosensitive resin layers, such as polyester compounds disclosed in Japanese Patent Application Laid-Open No. 2-96696, British Patent No. 112277
No. 1313309.

Polyvinyl cinnamate resins described in U.S. Pat. No. 1,341,004 and U.S. Pat. Includes sets L&, II. The amount of photosensitive layer provided on the support is about 001 to about 71 g/rrr, preferably 0.5
~4 g/rn'.

After image exposure on the 28th plate, a resin image is formed by conventional processing including development.

For example, the photosensitive layer consisting of a diazo resin and a binder
In the case of the 28th printing plate, after image exposure, the unexposed portions of the photosensitive layer are removed by development to obtain a 41st printing plate.

In the case of the 28th plate having the photosensitive layer (2), after image exposure, the exposed portion is removed by developing with an alkaline aqueous solution to obtain a 11i printing plate portion.

(Example) Hereinafter, Unreleased II will be described in more detail based on Examples.

Example 1 Aluminum alloys No. 1 to No. 1 with the composition shown in Table 1
12 was melted and cast, and both sides were milled to a thickness of 350III.
l: An ingot with a length of 2000+i■ is heated at 550°C.
It was scorched for 10 hours at a temperature of . This is 450-250
After hot rolling to a thickness of 4.5n+m at a temperature of
It was pre-crystallized (temperature rate 50°C/hour, cooling rate 20°C).
°C/hour). This was cold rolled to a plate thickness of 1.8 mm (area reduction rate: 60%).

After annealing at 500°C for 10 hours in a continuous annealing furnace to completely crystallize 111, it was rapidly air cooled to 100°C for 12 seconds. This is then further cold-rolled to a thickness of 0.31 (
The area reduction rate was 83.3%), and an aluminum alloy plate for lithographic printing was obtained.

Next, aluminum alloy rolled plates of No. l to No. 0.12 and No. 13 (plate thickness 0.30 mm JIS1050-H1
B aluminum alloy plate), No.

14 (plate thickness 0.30+mm JIS 1100-H16
aluminum alloy plate), No. 15 (plate thickness 0.30mm
JIs 3003-H14 aluminum alloy plate) was sanded with a rotating nylon brush in a suspension of pumice stone and water.
After vertical treatment, etching was performed using a 20% aqueous solution of L/Y sorter so that the dissolution of aluminum was 5 g/m''.The paste was thoroughly washed with running water, pickled with a 25% nitric acid aqueous solution, and then washed with water. The thus prepared substrate was heated at a current density of 20% in an electrolytic bath containing 0.5 to 2.5% nitric acid as described in Japanese Patent Application Laid-Open No. 146234/1983. AC electrolysis was carried out at A/d m'.Subsequently, the surface was cleaned by immersing it in an aqueous solution of 15% sulfuric acid at 50°C for 3 minutes, and then 20% sulfuric acid was added to the IE acid component. An oxide film of 3g/rrf was formed at a bath temperature of 300C.

The photosensitive layer described in F is applied to the sample prepared in this manner. ? The amount of coating i7k was 2.5 g/go.

Naphthoquinone-1,2-diazide-5=ester compound of sulfonyl chloride, pyrogallol, and acetone resin (described in the Examples of US Pat. No. 3,635,709)...0.75g Cresol novolac resin... ...2.00g Oil Zulu #603 (manufactured by Orient Chemical Co., Ltd.) ...0.04g Ethylene dichloride ...16g 2-methoxyethyl acetate ...12g The photosensitive lithographic printing plate thus obtained was transparentized. PS light (Toshiba metal halide lamp MU2000-2-OL type 3K) from a distance of 1m closely attached to the positive image.
After exposure for 30 seconds using a Furisha 3'' (sold by Film ■) with a V light source, it was immersed in an aqueous solution of 5% lithium silicate for about 1 minute. Develop,
Samples No. 1 to No. 15 were prepared by washing with water and drying.

Sample No. 0 created in this way. Tests were conducted on the uniformity of electrolytically etched rough surfaces, stains in non-image areas, fatigue strength, and static strength of 1 to N0.15. The test method is as follows. The results are shown in Table 1.

(Test method) (1) The uniformity of the electrolytically etched rough surface was measured using a scanning electron microscope. The uniformity of the pits was evaluated, and excellent results were marked with ◯, good results with △ marks, and poor results with × marks.

(2) Contamination of non-image areas After printing 10,000 copies using aKOR, the contamination of non-image areas was evaluated and excellent results were marked with an O mark, good results with a Δ mark, and poor results with an × mark. .

(3) Fatigue strength Cut a test piece of 1020mm and length 100+xm from each sample, fix one end to a jig, bend the other end upward at an angle of 30', return it to its original position, and 1
The number of times until breakage was measured.

(4) JIS No. 5 test pieces were prepared from the static strength samples, and tensile strength, 0.2% yield strength, and elongation were measured by a tensile test.

(5) Occurrence of streaks: Visually observe the surface after electrolytic etching. If streaks have not occurred at all, mark O. If streaks have occurred partially, mark Δ. Objects are represented by x marks.

As is clear from Table 1, the aluminum alloy plates No. 1 to No. 7 for printing plates obtained by the method of the present invention have uniformity of the electrolytically etched rough surface, streak resistance, stain resistance of non-image areas during printing, It can be seen that both properties in terms of fatigue strength and tensile strength are satisfied and are superior to the conventional J-Natsu S 1050.1100 and 3003.

In contrast, aluminum alloy plate N with a comparative alloy composition outside the composition range of the aluminum alloy plate in the method of the present invention
It can be seen that in the case of No. 8 to No. 12, the uniformity of the rough surface, the staining of the non-image area during printing, the fatigue strength, and the tensile strength are poor. That is, No. 8, which has a small Mg content, has good uniformity of the rough surface and good staining in non-image areas during printing, but has poor tensile strength, and No. 9, which has a large Mg, Si, and Fe content.
At No. 11, the fatigue strength and tensile strength were good, but the uniformity of the rough surface and the staining of non-image areas during printing were poor.

Further, No. 12, which contains a large amount of Cu, is inferior in the uniformity of the rough surface and the stain resistance of the non-image area during printing.

Example 2 The alloy ingots No. and 2 in Table 1 in Example 1 were subjected to soaking treatment at a temperature of 560°C for 8 hours, and then heated to a thickness of 5.0-1 at 480 to 300°C. Hot rolled.

Furthermore, annealing, cold rolling, annealing/cooling in a continuous furnace, final cold rolling, and temper annealing were performed under various conditions shown in Table 2.

The thus produced aluminum alloy plate for printing plates was surface treated in the same manner as in Example 1.

Plate making was performed under the same conditions to create samples Nos. 16 to 28.

The same tests as in Example 1 were conducted on these samples, and the results are shown in Table 2.

As is clear from Table 2, the aluminum alloy plates for printing plates No. 16 to No. 21 prepared by the method of the present invention have good uniformity of the electrolytically etched rough surface, streak resistance, and stain resistance of non-image areas. , excellent fatigue strength and tensile strength.

On the other hand, No. which is not annealed after hot rolling.

In No. 22, No. 23 where the annealing conditions are different, streaks occur. In addition, samples No. 24, No. 25, No. 26, which have different heating and cooling conditions using a continuous furnace, are inferior in either the uniformity of the rough surface or the staining of the non-image area.

Further, No. 27, which has poor temper annealing conditions, has poor fatigue and tensile strength, and No. 28, which has a low area reduction rate, has poor strength and rough surface uniformity.

(Effects of the Invention) As described above, the lithographic printing plate support obtained by the method of the present invention has excellent rough surface uniformity, is less likely to cause stains on non-image fi1, and can prevent streaks from occurring.
Furthermore, since it has excellent fatigue strength and tensile strength, it has the WJ'A effect of being able to function as a lithographic printing plate that has both of these properties.

Also, in the present invention, after final cold rolling.

Furthermore, a support for a lithographic printing plate with particularly high fatigue strength can be obtained by applying annealing to a predetermined temperature.

Patent applicant Furukawa Aluminum Industries Co., Ltd. Patent applicant Fuji Photo Film Co., Ltd. Agent Patent attorney Ii 1)
Toshi San I",,), :'l'l"i

Claims (2)

[Claims] (1) Mg0.35-0.9%, Fe0.05-0.5
%, Si0.2% or less, Cu0.05% or more (% of
(indicates weight %), an aluminum alloy consisting of the remainder Al and unavoidable impurities is soaked and then hot rolled, and the hot rolled sheet is annealed at a temperature of 300 to 520°C for 30 minutes or more and then cold rolled. , then heated in a continuous annealing furnace at a temperature of 460° C. or higher for less than 10 minutes, cooled to 100° C. or lower within 1 minute, and further subjected to final cold rolling with an area reduction of 50% or more. A method for manufacturing an aluminum alloy support for printing plates. (2) Mg0.35-0.9%, Fe0.05-0.5
%, Si0.2% or less, Cu0.05% or more (% of
(indicates weight %), an aluminum alloy consisting of the remainder Al and unavoidable impurities is soaked and then hot rolled, and the hot rolled sheet is annealed at a temperature of 300 to 520°C for 30 minutes or more and then cold rolled. , then heated in a continuous annealing furnace at a temperature of 460°C or higher for less than 10 minutes, cooled to 100°C or lower within 1 minute, and subjected to final cold rolling with an area reduction of 50% or more,
Further, in a batch furnace at a temperature of 120 to 250 °C
Minutes or more, or 150-420℃ in a continuous annealing furnace
1. A method for producing an aluminum alloy support for a lithographic printing plate, which comprises performing temper annealing at a temperature of 120 seconds or less.