JPS6063346A - High strength aluminum alloy plate for printing plate - Google Patents

Abstract

PURPOSE:To obtain a high strength Al alloy plate for a printing plate having improved handleability and electrolytically roughening characteristics by specifying the thickness and grain size of an Al-Mg-Fe alloy having a specified composition after cold rolling into a plate. CONSTITUTION:An Al alloy consisting of 1-6wt% Mg, 0.05-1.5wt% Fe and the balance Al with impurities is cold rolled into a plate of 0.05-0.3omega thickness so that the average width of the grains is adjusted to <=35mum. To the alloy may be added 0.1-0.7% Mn and 0.05-1% Cu. The grain size is adjusted by selecting conditions in cold rolling stages which are carried out while interposing a process annealing stage. The resulting Al alloy plate for a printing plate has superior etchability, high strength and superior handleability, so the thickness can be reduced without deteriorating the printing performance and printing resistance.

Description

[Detailed description of the invention]

The present invention relates to a high-strength aluminum alloy plate for printing plates, and more specifically, it can be used as a support for 98 plates used in off-cent printing. The present invention relates to a high-strength aluminum alloy plate for printing plates that provides a surface with excellent uniformity. Conventional aluminum for offset printing, as a shim plate (A1050, Al2O2, A3 for geometric roughening method)
003 is used, and in accordance with the electrolytic surface roughening method, 1\H)50 equivalent A is used from the viewpoint of ease of conversion. However, pure aluminum
When the plate is made thinner, problems such as folding during handling and elongation of the plate during printing are likely to occur.Furthermore, burning treatment (usually at a temperature of 200 to 300°C to 3 or 10
These problems will result in 11 nids when you do this for 1 minute). In addition, it has good electrolytic flattening properties (for l-phase 8i'14'A, even if the strength is increased by y1 due to cold rolling, the yield strength is 0.2% yield strength, hereinafter simply referred to as "force"). [at most] '5, /11111'', so
Particularly in the case of large-area plates, the above-mentioned problems tend to occur unless the printing plate support has a plate thickness of 0.24 mm or more, and this poses a problem when used as a printing plate. In recent years, there has been an increasing demand for thinner type 11 roughened supports, and as a result, handling has become difficult. In response to these demands, we first focused on ease of handling, paying particular attention to "bending" during handling, and investigating the relationship between the thickness and yield strength of aluminum plates. For evaluation, the evaluation method shown in Fig. f:51 is most suitable.This evaluation method involves fixing one end of an aluminum plate with a width of 15i11n horizontally, and placing it 100m from the fixed end.
The minimum load at which "bending" is observed when the load is applied and unloaded is placed at the tip of +n. In this evaluation method, the lowest f! ('vV[gl) and proof stress (σo, 2fKg/nun']) and plate thickness (L[+t
Considering the relationship of u111), we get ＼■No. This is the shaded area X. In other words, when comparing l~1050 korean and 0.24 m mouth 1 thickness, if the plate thickness is O,], 5b++n, the yield strength is 22 Kg.
/ If the thickness is 1+ m2 or more, the thickness of the two plates is 0. If the thickness is 12+ nm, the yield strength is 26 kg/mm or more. lom+n, the proof stress is 30Kg/mm or more, and the thickness of the two plates is 0.08m+
It is clear that if n is equal to or greater than i (force 35 K gl 111111"), the same "breakage" resistance performance can be obtained. As shown in this evaluation result, the strength value does not deteriorate handleability even if the wall is made thinner. In addition, we basically selected MH'(MH') as the contained element for strength, and in this system, we investigated electrolytic surface roughening and one unique condition of the printing plate material. Conventional During AC electrolysis surface roughening, pure aluminum was used as the element 4T4, and there were problems with strength and handling, so it was investigated whether various elements were added to improve the strength.
] In particular, M8 does not change the distribution of eutectic compounds and precipitates and has a small effect on the electrochemical properties of aluminum elements 4 and 4, so
For example, as seen in Japanese Patent Publication No. 58-006635, 1, Te Kaisho 55- (128874), etc.
．． Attempts have already been made to include small amounts of about 4.0.5+uL%. However, inclusion of more than this content was not carried out because it would affect the electrolytic surface roughening situation. However, by containing M8 at least 1%, preferably at least 2...1%, the present inventor has created an electric f'+! which is uniformly fine and very suitable for printing plates. (8ru but 1i
] and that in commonly used Al-Mg alloys, heat generation and
AI-N, A1-Mg-Cu during stabilization treatment after rolling
It is well known that system precipitates precipitate, and that these precipitates occur to some extent at grain boundaries during annealing before cold rolling, and that these precipitates tend to become the nucleus of layer corrosion. Based on this fact, we believed that by adjusting the eutectic compound distribution and the above-mentioned precipitate distribution appropriately, we could obtain an electrolytically rough surface suitable for printing plates, and as a result of conducting research on the appropriate material condition, we completed the present invention. It is. The high-strength aluminum alloy plate for printing plates according to the present invention is (
1) Mg1-6u+L%, FeO,05-1,5Ll
The thickness of the aluminum alloy after cold-open rolling is 0.05 to 0.3 m+
A first invention provides a high-strength aluminum alloy plate for printing plates subjected to electrolytic roughening treatment, characterized in that the average width of crystal grains in the plate thickness is 35μIl+ or less, )Mg], -66%FeO,05-
An aluminum alloy containing 1.5 iuL%, MnO, 1 to 0.71%, and the remainder consisting of impurities and AI has a plate thickness of 0.05 to 0.3+nm after cold-open rolling, and A second invention provides a high-strength aluminum alloy plate for printing which is subjected to electrolytic roughening treatment, characterized in that the average width of crystal grains is 35 μI11 or less, (3) MH
I-6wL%, FeO,05-], 5uL%, Cu
Contains O,05-1u+1%, remaining impurities and A1
The thickness of the aluminum alloy after cold rolling is (1,
05. Invention of a high-strength aluminum alloy plate 3 for printing IUi, characterized in that the average width of crystal grains in the plate thickness is 35 μm or less, and (4 )Mg]-66wt%FeO,05
-], 5+u1%, C110, 05-11%, h4no
, 1-0.7 LI 11%, the remainder impurities and A
Aluminum laminated from 1, the plate thickness after cold rolling of the alloy is 0
．． A fourth invention is a high-strength aluminum alloy plate for printing plates, which is +11 m and has an average grain width of 135 μm or more in the plate thickness. The high-strength aluminum alloy plate for printing plates according to the present invention will be explained in detail below. First, the components and component ratios of the high-strength aluminum alloy plate for printing plates will be explained. It is an element that is included to uniformly refine the electrolytically roughened surface, improve strength, and improve handling properties, and the content is 1.
If the content is less than 6%, the electrolytically roughened surface will be non-uniform due to the lack of precipitates as described above, and the strength required for thinning the wall will not be maintained, and if the content exceeds 6%, M2C will not be produced during casting. Line defects are likely to occur when the surface of a rolled plate is roughened. Therefore, the M content is set to 1 to 61%. In order to make the electrolytically roughened surface more uniform and to obtain sufficient strength by tightening, it is desirable that the content be 2 L% or more. Fe is an element that is included to make recrystallization finer, to improve handleability, and to make the electrolytically roughened surface uniform.
It is an element that forms a eutectic compound of the Al-Fe system, and the Al-Fe-based eutectic compound is effective in refining recrystallized grains.
Coupled with the presence of U-based precipitates, it has the effect of forming a uniform and fine electrolytic surface, and if the content is less than 0.05+uL%, the recrystallized grains become finer and the electrolytic surface becomes uniform. The fineness effect is small, and if the content exceeds 1.51%, the electrolytically roughened surface becomes non-uniform due to the formation of coarse compounds. Therefore, the Fe content is set to 0.05-1.5u+j%. C1 is an element effective for enhancing the etching effect by electrolytic first L surface formation and for improving strength, and the content is 0. (If the content is less than 15u+L%, this effect will be small, and if the content exceeds 11%, the dissolution during 1.1-electrolytic surface roughening will be excessive, which is not preferable. Therefore, the CLI content is 0.05 ~1v+t%. MIT is an element that has almost the same effect as Fe, and is in the 1000s. In order to make the grains finer, improve handling, and make the electrolytically roughened surface uniform, the above-mentioned Fe-containing amount of Mn in aluminum alloy
These effects are small when the content is O, 1u+j% and less than 114, and when the content exceeds 0.711It%, AI
-'Fe-Mu system eutectic material is
The 1111-sided surface tends to become non-uniform. Therefore, Mn
The content is 0.1 to Q, "u+t%.In addition to the above-mentioned components, Ti may be included to refine the ingot structure, but Ti (gold content) \1-Ti particles and/or i' i - B particles tend to aggregate, and electrolytic surface roughening treatment tends to result in an uneven surface.
1 content is preferably 0.05+IIt% or less. In addition, there is no problem with impurities as long as they are within the range normally found in commercially available industrial pure aluminum.
If Sl exceeds 0.5+uL%, etched areas tend to appear due to electrolytic surface roughening treatment, so 0.5...t%
The following shall apply. Next, to briefly explain the manufacturing method of the high-strength aluminum alloy plate for printing according to the present invention, the above-mentioned molten aluminum alloy is formed into a die by a normal method, hot rolled, cold rolled, intermediate 0.05-0.3m by annealing and cold rolling
The plate is n+thick. In order to make the electrolytically grained surface finer, it is necessary that the recrystallized grains during intermediate annealing be as fine as 35 μm or less, and it is desirable that the cold rolling up to this intermediate annealing should be carried out by at least 30%. It is preferable that the grains are fine grains of 26 μm or less, and in this case, the cold rolling rate is 50% or more. Also, is there any practical problem with this intermediate annealing, whether it is a slow heating/slow cooling method or a rapid heating/quenching method?
In order to refine the recrystallized grains, a rapid heating/quenching method is preferable. Note that there is no problem as long as the annealing conditions are at a temperature sufficient for recrystallization, for example, 300' (::) or above. After this intermediate annealing, final cold rolling is performed at a cold rolling rate of 20% or more. Adjust the intensity to 22KH/+llm2 or more,
If the cold-opening rolling ratio is less than 20%, the required strength cannot be obtained, and the rolled plate will not be sufficiently distorted, and it will be difficult to obtain sufficient flatness as a supporting book. In addition, in the cold rolling of the thin plate described in -1-6, 4.
g or]\1-Since there is a Cu-based compound 411 in H1ll, the final tempering is Hllll, l-I211, IIJll.
However, in order to most effectively remove the precipitate, H or n is preferable. In this way, the electrolytic surface roughening treatment is applied to the aluminum alloy plate, which has a rough texture, because the surface of the aluminum alloy plate is contaminated with oils, fats, chains, dirt, etc.
Prior to electrolytic surface roughening, it is preferable to degrease and wash the aluminum alloy plate according to conventional methods, such as solvent degreasing using trichloride and thinner, emulsion degreasing using kerosene and triethanolamine, and concentration 1 to 10%.
Immerse in a caustic soda solution at a temperature of 20 to 70°C for 5 seconds to 10 minutes to remove dirt and natural oxide film that cannot be removed by degreasing alone. Immerse for 5 seconds to 5 minutes at a temperature of
Examples include a method of neutralizing and removing smut after alkali etching. Electrolytic etching is carried out in a hydrochloric acid or nitric acid solution, and if a hydrochloric acid solution is used, the concentration is 0.3 to 3% L%. , preferably 0.5-2
A range of u+1% is preferred. In addition, when using a nitric acid solution, the concentration is 0.5 to 5u+L%, preferably 1
~3+uL% is preferred. In this electrolytic solution, corrosion inhibitors or stabilizers such as chlorides such as ammonium chloride and sodium chloride, nitrates such as ammonium 11 nitrate and 1 lithium nitrate, trimethylamine, diethanolamine, ethylenediamine, hexamenalennoamine, etc. 0.05 to 3% of amines, aldehydes such as formaldehyde, phosphoric acid, chromic acid, sulfosalicylic acid, etc.
It can be included. Electrolysis and treatment conditions depend on the electrolyte used and lil'i ;!
! Since it changes depending on the degree of L surfaceization, -・
Although it cannot be determined in general terms, the temperature is generally between 10 and 40°C, preferably between 20 and 30°C, and the current density (
AC) (Sat 20-2 (10A/den2, preferably 50・i!50A/llb+", time is 2-12
It takes 0 seconds. The alternating current used when performing the electric MJIY surface processing using such an electric liquid is an alternating current waveform current with a waveform such as a rectangular wave or a trapezoidal wave, which is used by alternating the positive and negative polarities. It also includes ordinary commercial alternating current, ie, sinusoidal single-phase alternating current and 3,111 alternating current>A: light minutes. In this way, the aluminum alloy plate with the M811 surface is subsequently washed with water and then desmutted. Desmat by soaking for minutes. Then, when the electrolytically grained plate obtained is used as a support for a printing plate, it may be anodized according to a conventional method.
It is carried out by electrolyzing an aqueous solution of L% at a current density of 1 to 10 A/dm2. After this anodization, 11-hole or hydrophilic treatment may be performed using hot water, silicate, dichromate, acetate, hydrophilic polymer compound, etc., if necessary. The photosensitive material applied to the aluminum alloy plate obtained in this way is not particularly limited, and various well-known materials may be used, for example,
Composition consisting of hydrophilic polymer and noazonium salt, Ki7
Compositions of a diandic compound and an alkali-soluble resin, unsaturated carboxylic acids that trimerize when irradiated with actinic rays, such as cinnamic acid and phenylene diacrylic acid as their (1) acid component, actinic rays. Examples include compositions of a binder polymer and a compound that causes a polymerization reaction when irradiated with irradiation, and azide-based photosensitive composites. -1- A photosensitive lithographic printing plate is produced by applying the coating to the high strength aluminum alloy plate for printing according to the present invention and drying it. common law

[Thus, when exposed and developed, it has excellent hydrophilicity and water retention, and (the adhesion between the image area made of a luminescent substance and the aluminum alloy plate is extremely strong, making it excellent in reconnaissance and first printing). δ is calculated by moving the printing plate by 1υ.The high-strength aluminum alloy plate for printing according to the present invention is
Etching properties are limited, strength is high, and handling is uncertain.
Therefore, thinning, which was impossible with conventional pure aluminum plates such as A11.0 (1, Al050), can be achieved without reducing printability and printing durability of 4 fl. Examples of the high-strength aluminum alloy plate for printing plates according to the present invention will be described.Example 1 Regarding the high-strength aluminum alloy A for printing plates according to the present invention shown in the f51 table, after filter treatment, agglomeration, surface side, 5
10°(:X61) Hot rolled after soaking to a thickness of 411111
The final rolling temperature was 280°C. This was cold-rolled to a thickness of 0.75 noo, and the heating rate and cooling rate were both 500°C/++l; II.
Perform intermediate annealing at 00℃XOsee, 0.1511
1111 j! No. W rolled in Table 2,
It was set as 4. Further, after the hot rolling of the alloy A of the present invention, 0.
Cold rolled to a thickness of 3+t) II) at 340°C x 2
After intermediate annealing using Hr heat removal and slow cooling method, 0.111II
The thickness of Il+ was determined by rolling and No. 2 in Table 2. Note that the fill-up crystallinity of both No. 1 and No. 2 after cold rolling was about 80'C. Also, A 1050 paulownia'B's 0.24m+n in Table 1
We use Welfare for comparison (No. 3 in Table 2), and furthermore, A1
050 with a thickness of 0.24 was rolled to a thickness of 0.11+nm and used for comparison with No. 2 (No. 4 in Table 2)
. As is clear from Table 2, the high-strength aluminum alloy plate for printing plates according to the present invention has a thin wall ratio of 4fj 92 compared to the 0.24+nm thickness of A1050IJ in terms of handling properties.
Shiko is excellent. Next, these aluminum 911 alloy plates were treated with the steps described below to improve surface roughening and printing. ′
We investigated the nature of 1.Iij-treated aluminum alloy plate was heated to 5+lI in 1% caustic soda aqueous solution at 65°C. : i' was alkaline etched for 1 minute at 30°C, washed with water, and etched in 10U + 1% nitric acid aqueous solution
After neutralization at a temperature of °C for 1 minute, it was washed with water. 2. In the case of hydrochloric acid treatment/etching, the pretreated aluminum alloy plate was heated in an electrolytic aqueous solution containing 1.51% hydrochloric acid at a temperature of 125°C. Electrical current density 80 A / (1111", treatment If, 'llB 120 seconds f!1) Alloy plate in nitric acid 2+++1%
Electrolytic surface roughening was carried out in a bath temperature of 30° C. with an alternating current density of 80 A/(1111") and a processing time of 20 seconds. 3. Grained plate with electrolytic roughening was then desmutted in a 15+U1% caustic soda solution at a temperature of 60°C for 10 seconds and then neutralized and washed with water. 4. In the case of anodized 1-12SO, system; Desman 1, aluminum washed with neutralized water The alloy plate was further heated in a 20+uL% sulfuric acid solution at a temperature of 25°C using lead as the main electrode,
Anodic oxidation is performed for 30 seconds using a current density 6A/cb meter. In the case of 83PO, system; Desma), the neutralized and water-washed aluminum alloy plate was further heated at 25°C in a 421% phosphoric acid solution.
Anodic oxidation treatment was carried out at a current density of 2.6 A for 6 minutes using lead as a monthly electrode at a temperature of 2.0 C. 5. Post-treatment After anodizing treatment, jIS3i3' sodium silicate 11
% aqueous solution at a temperature of 85° C. for 1 minute, washed with water, and then dried. 6. Photosensitive layer (1) In case of O-quinone diand type photosensitive layer, the composition of the photosensitive liquid is shown below. 7) Condensate of '4-non-1,2-and-5-sulfonylchloride IS and -21-cresol formaldehyde novolak resin (condensation rate 25% mole)...
... 4. 8゜・111-Cresol・Formaldehyde/Bolac resin (manufactured by Susumu-Duress Co., Ltd.) 9.028・Naphtoki 7-Nanoano F-4 Chloride・0.19g・Victoria Viewer Flue Boll (Hot) made by Mitani Chemical Co., Ltd.・
・・・・・・ o, 1g8 ・Ethyl cellosolve ・・・・・・・ if, 'l
f', l (The amount of coating after drying of the H photosensitive layer is 2S11)H
/ tln'. The photosensitive lithographic printing plate IJ made in this way,
A resolution chart (manufactured by Ugler) and a 7-let stencil for sensitivity measurement were brought into close contact with each other, and exposure was carried out using a metal halide lamp as a light source. Next, this is 1 lium metasilicate 4u + L%
It was developed with an aqueous solution at a temperature of 25° C. and under the conditions of 45 sheets. (2) E) In case of azonium salt photosensitive layer The composition of the photosensitive liquid is shown below.・F,, salt of a condensate of P-noazinophenylamine and formaldehyde...0.42゜・Copolymer of P-hydroxyphenylmethacrylamide, acrylonitrile, ethyl acrylate, and methacrylic acid...
・・・・6.0゜・Victoria Viewer Blue B O
H (manufactured by Hodogaya Chemical) (50% methanol solution)...
・0.168 Diurimer-AC-] (', 11
- (Polyacrylic acid, manufactured by Nippon Pure Chemical Industries) ・・・・・・ 0
．． 18゜Methyl cellosolve... The coating amount after drying of 100g photosensitive layer is 191□1ε/dm''.The thus obtained photosensitive lithographic printing plate was marked with a resolution chart (manufactured by Ugler) and A step tablet for sensitivity measurement was placed in close contact with the tablet and exposed using a metal halide lamp as a light source.Next, it was immersed in the developer shown below at a temperature of 25°C for 1 minute, and then the surface was lightly rubbed with a degreasing sieve to remove the unexposed areas. Removed.Developer/Benzyl alcohol 3011] 1 ・Sodium carbonate 5g ・Lium sulfite 5g ・Sodium isopropylnaphthalene sulfonate 1 (1B ・Water 11) (3) In the case of an unsaturated carboxylic acid photosensitive layer that causes diarsenization! 11411 is shown below: - Photosensitive polyester made by condensation of 100 mol% of diethyl 1)-7-enylenenoacrylate and 100 mol of 1,4-di-β-hydroxyethoxycyclohexane...・-l, +3,. ・(2-benzoylmethylene)-1-methyl-β-su7
Tothiazoline...+3,328 ・Cheap 2. Fragrance acid...0,16ε Hydroquinone...0.08B Monochlorobenzene...100.0ml Pigment (Heliogen Blue, C, I, Pigment Blue)...f
), 8B The coating amount of the photosensitive layer is 14B/(II□12).
An image cutcher (manufactured by NGLER) and a stamp table for measuring sensitivity were brought into close contact and exposed using a metal halide lamp as a light source. Then, it was developed by wiping with a developer having the composition shown below. Developer・4-butyrolactone・・・・500.0+nl・
Triethanolamine ・・・50.0ml・Glycerol・・・・50.0ml・Methyl abinitate・・・・5. O+nl/Hydrogenated Undron (Stabelite resin from Vercules Powder Co., Ltd.)...
・・0.58・Wetting agent (DuPont's Zonyl A)・・
The 4.5+nl electrolytic crude electrolyte properties are shown in Table 3, and the printing properties are shown in Table 4. Example 2 Regarding the high-strength aluminum alloy for printing IUi according to the present invention shown in Table 5, after filter treatment, the agglomerated side was
After soaking at 10°CXGHr, perform hot rolling to a thickness of 4+n.
+n and waist final rolling temperature were: +oo°c. This was cold rolled to a thickness of 0.40 IM and 0.4+nm thick.
Intermediate annealing at l°I: 15 f) °C Rolling was performed.In addition, in the case of heat removal and slow cooling, the IJ was approximately 4
350'CX' at a heating/cooling rate of 0℃/l-1r,
(Tl r annealing is performed, and further furnace cooling is performed by 11 degrees to 200℃, and in the case of rapid heating and cooling, 500℃/+
500°CX (
The annealing was performed as follows. The fill-up temperature after the final cold rolling finish was about 80°C in all cases. These 0. A plate with a surface thickness of 1+ was heated at 50°CX30 in a 3u+L% caustic soda aqueous solution as it was after rolling-1-9.
! ;(Washing with water after performing alkaline etching of C) Ou
Neutralize in +L% nitric acid aqueous solution at 25°C for 30 seconds,
, 5U+F% hydrochloric acid solution at a temperature of 25°C, alternating current density SoA/dm'', and treatment time 15 seconds.
After desmutting with O'CX for 10 seconds, it was washed with neutralized water. Table 7 and FIG. 3 show the surface roughness and microscopic evaluation results of these Den-Isho roughened plates. These results show that the high-strength aluminum alloy for printing plates according to the present invention is extremely uniform.
It is clear that a strong peer) is being formed. The strength and handling properties of these materials are shown in Table 8, and it is clear that they are superior to pure aluminum. JIS 105044' 0.
Data for 3+n+n thickness are also shown. Example 3 Comparative examples shown in Table 9 and high-strength aluminum alloys for printing according to the present invention E, F, (9 after ingot formation, 5H)'
CX6Hr was soaked, hot rolled at a temperature of about 0°C to a thickness of h+m, and then rolled to a thickness of 0.7511I+11, resulting in a thickness of 0.75+nb+l! 500'C/m at J
Annealing was carried out at 500° CX Osee at a temperature increase rate of 0.5 in, and the thickness was further finished to 0.15 m+n. In each example, the coil-up temperature after cold opening was about 80°C. These 0.15m+n thick plates were heated at 65°C for 60s in an L% caustic soda solution as I
After performing ec al-etching, wash with water and loLI
After diluting in a thin solution (IL% nitric acid) at 25° C. for 60 seconds, it was washed with water. Furthermore, electrolysis was carried out in a 1.51% hydrochloric acid aqueous solution at 25°C under the conditions of a first-flow current density So A /den2X 20 sec, and then in a 1 volume solution of 5IIIt% caustic soda at 1°C After the desmat treatment, it is neutralized and washed with water. Evaluations of the strength and handleability of these examples are shown in Table 1 ( ), and Table 11 shows the negative surface performance. As can be seen from the results of Tables 10 and 11,
Comparative Example D (Mg O, 24 iuL%) had problems in terms of strength, handling, and electrolytic surface ratio.
In G, the M8 content is greater than +t%, so it is clear that these points have been completely resolved. As explained above, the high-strength aluminum alloy plate for printing IUii according to the present invention has the above-mentioned 1111 properties, excellent etching properties, high strength, ++y, +
It has excellent spreadability, and printability even when made thin.):
This has the effect of not impairing printing durability and printing durability. .

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the method for evaluating bending resistance. Figure 2 is a diagram showing the area where 'breaking-1' does not occur based on the relationship between plate thickness and yield strength. Figure 3 is an illustration of the average grain size and surface phase. Diagram showing the relationship with degree,
FIG. 4 is an explanatory diagram of the repeated bending test method. Sweet 1 Figure W Spear 4m Sai 2 Figure 0 0.1 0.2 0.3 0.4 0.5 Itakai (
m system) 8o4 Continuation of 1st page 0 Inventor Masahiro Kawaguchi 8 Oyadai-cho, Moka City [Phase] Inventor Akira Hoshino 8 Oyadai-cho, Moka City

Claims (1)

[Claims] (1Ngl-611,%, Pe0.05-1.5I
The thickness of the aluminum alloy after cold rolling is 0j15 to 0.3 m
An electrolytic film E characterized in that the average width of crystal grains in the plate thickness is 35 μm or more.
High-strength aluminum alloy plate for printing plates. (2) N4B 1-6u+L%, Fe 0.05□-
The plate thickness after cold rolling of an aluminum alloy containing 1,5u+1%, Mn0.1~0.7III%, and the remainder consisting of impurities and A1 is 1,(15~0.3ann, and the plate A high-strength aluminum alloy plate for printing plates subjected to the electrolytic surface roughening method, which is characterized by the fact that the average width of i is 35 μm or less. (3) MHl- 6u+L%, FeO, [)5・-1,5
u+1%, Cu0.05.~]u+L%, and the remaining impurities S3 and A1 have a plate thickness after cold-open rolling of 0.05 to 0,311+111, and at that plate thickness. A high-strength aluminum alloy plate for printing plates, characterized in that the average width of crystal grains is 35 μm or less. (4) MFl 1-6u+L%, FeO, 05-1.
5+++L%, C110005~11%, Mn0.1
The plate thickness after cold rolling of an aluminum alloy containing ~0.7u+t% and the remainder consisting of impurities and A1 is (1.05
~Q, 3+n+n, and an average width of crystal grains (5 μIll or less) in the thickness of the plate.