JPS605861A - Production of base for lithographic printing plate - Google Patents

Abstract

PURPOSE:To obtain a base for lithographic printing having substantial resistance to fatigue and resistance to thermal softening as a printing plate by subjecting a casting Al alloy ingot having a prescribed compsn. to a soaking treatment then to hot rolling or further cold rolling and intermediate annealing and subjecting the rolled alloy to a final cold rolling at a specific reduction rate of area or above followed by temper annealing and forming the same. CONSTITUTION:An Al alloy contg., by weight, 0.05-0.30% Mg, 0.15-0.40% Si and <=0.05% Cu is subjected to a soaking treatment then to hot rolling or further cold rolling and intermediate annealing. Said soaking treatment is accomplished for three hours at 450-600 deg.C and the hot rolling at 550-200 deg.C; further the intermediate annealing after hot rolling is accomplished for 2-5hr at 300- 400 deg.C. The alloy plate formed in such a way is subjected to a final cold rolling to >=70% reduction rate of area followed by quick temper annealing for <=120sec at 250-350 deg.C in a continuous annealing furnace. As a result, a base for Al alloy lithographic printing which provides a uniform rough surface when electrochemically roughened and has excellent resistance to fatigue, thermal softening characteristic and printability is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a support used in a lithographic printing plate, which is formed by subjecting the surface of an 11-sided aluminum alloy plate to an anodic grain coating and further coating a photosensitive substance. The present invention relates to a method for manufacturing an aluminum alloy lithographic printing support that has a uniform rough surface obtained by electrochemical roughening treatment and has excellent fatigue strength, thermal softening properties, and printability. −・.

Conventionally, what has been widely used as a lithographic printing plate is a so-called PS plate in which a photosensitive material is spread on an aluminum plate that has been subjected to surface treatments such as roughening treatment and anodic oxidation coating treatment, and then dried. This is a printing plate obtained through plate-making processes such as image exposure, development, and washing with lacquer. The undissolved photosensitive layer resulting from this development process forms an image area, and the area where the photosensitive layer is removed and the underlying aluminum surface is exposed is hydrophilic, so it becomes a water receiving area and does not form a non-image area. This is a well-known fact.

As a support for such a lithographic printing plate, an aluminum plate is generally used, which has an excellent eaves surface treatment property, processability, and p-resistance. Conventional materials used for this purpose include JIS
1050 (purity Δbu with purity 99.5% by weight or more),
J I 5ITOO(Δ , (-0.05~0.20
jr point 171% Cu alloy), JIS 3003
(A i -0.05~0.204fi amount %cu -
1,5ii%M 11 alloy) etc. (7) Jt 0.1-0
．． It is an 8 mm aluminum alloy plate, and its surface is processed by any of the mechanical, chemical, and electrochemical dino methods.
The surface is roughened by a surface roughening method using one or two steps combined, and then preferably anodized to IJ color.

Specifically, it is described in Japanese Patent Application Laid-Open No. 11ti 48-495 (No. Aluminum lithographic printing plate subjected to chemical etching treatment and anodized film treatment described in Japanese Patent Application Laid-open No. 51-61304, JP-A-54-1462
Electrochemical treatment and post-treatment described in Publication No. 34,
An aluminum lithographic printing plate treated with an anodized film, an aluminum lithographic printing plate subjected to the electrochemical treatment, chemical etching treatment, and anodized film treatment described in Japanese Patent Publication No. 48-28123, or mechanical Aluminum lithographic printing plates are known which have been subjected to the treatment described in Japanese Patent Publication No. 4828123 after surface roughening treatment. By appropriately selecting the photosensitive layer coated on such a support, it is possible to obtain up to 100,000 sheets of clear printed matter.

However, there is a desire to obtain a large number of prints from a single printing plate (improvement of printing durability).

In such cases, PS using an aluminum alloy plate as a support
An effective method is to expose and develop the plate in the usual way, and then heat it at high temperatures (so-called burning treatment) to strengthen the image area.This method is described in Japanese Patent Publication No. 44-27243 and Kosho 44-27244
The heating temperature for such a burning process and 11) described in detail in the above publication depends on the type of resin forming the image, but the heating temperature is 3 to 7 in the range of 200 to 280°C.
Minute ranges were customary.

In recent years, there has been a desire for a burning process with a higher level of 1α and between short poems due to the need to increase printing durability and shorten the burning process time.

However, the conventionally used aluminum alloy plate is 28
If heated at a high temperature of 0°C or higher, aluminum will recrystallize, resulting in an extremely low strength and loss of stiffness, making it extremely difficult to handle and making it impossible to set the plate in the printing machine. There is a drawback that only the color registration of J5 (blue plate) cannot be achieved in multi-color printing, and a stable aluminum alloy plate with high heat resistance is desired.

On the other hand, as printing speeds have increased with advances in printing technology, the stress applied to the printing plate, which is mechanically fixed to both ends of the printing plate cylinder, has increased, resulting in a lack of strong electricity. This fixed part may become deformed or damaged, causing problems such as printing misalignment, or the plate may break due to repeated stress on the folded part of the printing plate (grip breakage), EIJ i6! I often find myself unable to do anything.

The conventional J) 31050 aluminum alloy plate is subjected to electrochemical roughening treatment] 111°C with a uniform surface or an appropriate surface [
ijA+1, and the non-images during printing (82 parts) are not easily stained or have poor fatigue resistance and heat softening resistance.Furthermore, conventional JIS 3003 aluminum alloy plates have sufficient fatigue strength and heat softening resistance. The electrochemical surface roughening treatment did not provide a uniform rough surface or an appropriate surface roughness, and there were also defects in that non-image areas were smudged during printing.

As described in Japanese Patent Application Laid-Open No. 58-42743, the present inventor has developed a method to obtain a uniform rough surface b'X1ff by roughening treatment.
We discovered an aluminum 3-mm alloy plate for printing with a fatigue strength of 1 and a manufacturing method thereof, and found that MuO,05~0.3
0 weight ■%, Si 0.03-0.30gm m%, F
e0015 to 0.40% by weight, the balance being A-button impurities l]
Soak N] 1! It is then hot rolled and has an area reduction of 70%.
The above cold rolling is carried out at 110℃ and then at 150~250℃.
We proposed a method for manufacturing aluminum alloy plates for printing, which is characterized by low-humidity annealing at a temperature of 1 hour or more.

However, in recent years, the required quality of printing plates has improved, and specifically, it is desired that non-image areas become less likely to get dirty during printing, and further improvements in this point are required. There is. In order to prevent staining of non-image areas during printing, it is important to improve the water retention of non-image f+IX, and for this purpose roughening treatment] A, especially electrochemically roughened surface It is necessary to obtain more uniformity of the immersed rough surface than before through chemical treatment.

Therefore, the object of the present invention is to have sufficient 1J1 stress resistance and heat softening resistance as a printing plate, and to obtain a uniform rough surface and appropriate surface roughness by 11th surface treatment, especially electrochemical roughening treatment. The purpose of this invention is to provide an aluminum alloy lithographic printing plate support that is less likely to cause stains in the non-IK+ areas during printing.The name of the present invention is based on the results of various studies.
10.05-0.30% by weight, 3i0.03-0.30
Weight ω%, F e O, 15-0.40ffi amount%, Cu
After soaking an aluminum alloy ingot consisting of impurities of 0.05% or less and the balance being A (7i), hot rolling or hot rolling followed by cold rolling and intermediate baking is performed. A final cold rolling with a surface area of 70% is applied, followed by annealing in a continuous annealing furnace at a temperature of 250 to 350°C for 120 seconds or more.
It has been found that the C-C aluminum alloy plate has the ability to achieve the objectives listed in item 1 above. The reason why the composition of the aluminum alloy ingot is limited as described above in the third aspect of the present invention is as follows.

M (I is added for the purpose of improving the strength and heat fatigue resistance without adversely affecting the 11th surface treatment and printing suitability of the printing plate, and is mostly dissolved in Af!, to improve the strength. Although it improves fatigue resistance, the effect is small when the content is less than 0.05% by weight (hereinafter, type φ% is simply expressed as %), and the effect is small.
．． This is because if it exceeds 30%, the uniformity of the roughened surface during the surface roughening treatment will deteriorate. "e" is added for the purpose of further improving the fatigue strength. It forms an intermetallic compound, refines the crystal grains and makes the structure uniform, but if it is less than 0.15%, the effect is small, and This is because if it exceeds .40%, the uniformity of the rough surface in the roughening treatment and printability will deteriorate.

Limiting Si to 0.03% to 0.30% is 0.03%
This is because the strength decreases when the amount exceeds 0.30%, and the electrochemical '! This is because the uniformity of the roughened surface after forming the 11-sided surface deteriorates, and the corrosion resistance also decreases.

The reason why Cu is limited to 0.05% or less is because C is an impurity.
If u exceeds 0.05%, electrochemical surface roughening treatment]1! This is because the pits tend to become coarse and the stain resistance of the non-image area of the printing plate is reduced.

The impurities contained in the aluminum alloy constituting the aluminum alloy plate for lithographic printing in the method of the present invention are usually commercially available A. et Vlllo
, 05% or less, Oro, 05% or more F1Z 110.05
% or less, there is no particular problem.

In addition, Ti and B, which are commonly used as crystal fine acclimation agents in the production of ingots, have a 1-! 0.0. ')% or less, 80101% or less is effective for uniformly refining the alloy structure.

As described above, the aluminum alloy plate for use in planographic printing according to the present invention is manufactured by subjecting a single-grade aluminum alloy ingot to a uniform treatment to dissolve lvlg and impurities. A part of c is dissolved as a solid solution, and a part of the 1:0 intermetallic compound is uniformly dispersed in a fine 1) III.

It is preferable that this soaking treatment J11 be carried out at a temperature of 450 to 600°C for three or more sides. Next, this is hot rolled by a conventional method, or after hot rolling, cold rolling and intermediate annealing are performed. Hot rolling 1 + rolling temperature is suitable to be carried out at 50 to 200'C, and if necessary, intermediate annealing after hot rolling is 300 to 400'C for 2 to 5 cycles or jt. It is desirable to perform the annealing at 400 to 550° C. for 120 seconds or less in a subsequent annealing furnace.

The plate thus obtained is finally cold rolled so that the reduction in area is 70% or less. In this final cold rolling, l
:The intermetallic compound of e is minute ti! (L/, crystallization 11 texture becomes uniform. If this area reduction rate is less than 10%, the dispersion of intermetallic compounds is insufficient and the crystal structure is non-uniform.41 However, it becomes uniform in surface roughening treatment<;'A'There are no 1q cards on page 11, 1
The rolled plate thus obtained is placed in a continuous furnace 111! Place in a third furnace at 250~350℃, preferably 270~350'
Rapid annealing for 120 seconds or more at temperature C. This J
, Temperature annealing with eel strip A'1 gives the rolled plate moderately low mechanical properties'C1, that is, strength and elongation when energized, and heat resistance softening 1;
'it! At the same time, I improved my score and at the same time got a slightly better A (
By suppressing the precipitation of intermetallic compounds of e as much as possible,
This is because the formation of 111i allows a uniform shape and appropriate surface roughness to be obtained, and as a result, improves water retention and stain resistance of non-image areas during printing. Temperature annealing strip 1'1 or 250' (:, lower than or over 350℃,
Also, the IJ processing time exceeds 120 seconds! ,: If the fatigue resistance 'HjN degree and heat softening resistance are not 111 or A
(Pit shape due to roughening of the surface due to the precipitation of O's private compounds: 1 becomes non-uniform, and the Il x aqueous and smudge resistance of the non-image area deteriorates.Produced in this way The aluminum alloy plate for lithographic printing of the present invention has a Jl
31050 aluminum base metal 1:) Furthermore, a uniform pitch shape and appropriate surface roughness are obtained, which improves water retention and stain resistance in non-image areas, as well as fatigue strength and heat resistance. It has excellent healing properties and is worth 1 yen.

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

The method of the present invention is to use folic acid or nitric acid.
Electrochemically grainy in a electric awakening i1W~°! -C-riru electrochemical graining method, and the Soi 1 Hoop Graining method in which the aluminum surface is scratched with a metal wire, fiJl
Ball-Frain method of graining the aluminum surface with l = 9 balls and tIJ + I'l'' agent, nylon flan polishing 1
5 (method can be used with geometric graining
It can also be used as

Aluminum treated with sand in this way is chemically etched with acid or alkali.

When acid is used as an etching agent, slight adaptation II l+
Although it takes a very long time to destroy the etchant, which is disadvantageous when applying the present invention industrially, it can be improved by using an alkali as an etching agent.

Alkali agents i, L, caustic soda, soda carbonate, alumin M soak, metasilicon u2 preferably used in the present invention
Using soda, phosphoric acid sorter, potassium hydroxide, lithium hydroxide, etc.) The preferred range of agricultural degree and temperature is 1.
~50%, at 20~100℃, the amount of dissolved
Preferably, the condition is 0 g/γn2.

After etching, pickling is performed to remove dirt (smut) remaining on the surface. Acids used in ITJ are 4+'l acids, sulfuric acid, phosphoric acid, rimic acid, fu-)ic acid,
Hydrofluoric acid and the like are used. In particular, for smut removal treatment after electrochemical surface roughening treatment, tit 9r or 5
Contact with 15-65% sulfuric acid at a temperature of 0-90℃
The alkaline etching method described in '12r Publication No. 48-28123) is very important.

J: sea urchin C%]! ! ′! The Ic aluminum plate can be used as a support for the lithographic printing plate, but if necessary, the anode D! It is preferable to perform a treatment such as a bicarbonate treatment or a chemical conversion treatment.

1 (,1,j) Polar oxidation treatment can be carried out using conventional methods in this field.
Hen (aqueous sulfonic acid, etc. or a mixture of two or more of these) 1 s or non-aqueous & 1 i + h
When a direct current or alternating current is applied to the aluminum, an anode can be formed on the surface of the aluminum.

yen (~0 s conversion place 1111 condition is used electric IIJ?
Since it varies depending on the liquid, −(12(J determined i′
1, but generally electrolyzed (Z) melon has 1 to 80%
, ) 1, temperature 5-70℃, electric (I'felk O, 5
~G O ampere j'/dm2, electric low 1~100V, 7
L 8Y IL7 Interval 1 (1 to 100 seconds (7) fQ
fiJl is appropriate.

Among these anodic oxide coating treatments, the British 'l':i
8'F No. 141276 No. 1 Ro 12768 is used,
The method of anodizing in sulfuric acid at a high iR flow density and the method of anodizing using phosphoric acid as an electrolytic bath as described in US Pat. No. 3,511,661 are preferred.

The anodized aluminum plate has been immersed in an alkali metal silica 1, for example, by dipping in an aqueous solution of sodium silicate, as described in the specifications of US Pat. The method described in US Pat. No. 3,860/126
A subbing layer of hydrophilic lululose (eg, carboxymethyl cellulose, etc.) containing a water-soluble metal salt (eg, bent lead acetate, etc.) can also be provided, as described in .

On the lithographic printing plate support according to the present invention, a photosensitive layer conventionally known as a photosensitive layer for [)8 plates is provided to obtain photosensitive planographic printing)&, which is then plate-made. The processed lithographic printing plate has excellent performance.

The composition of the photosensitive layer includes the following Jζ.

■Diazo) Photosensitive layer with 4f of casual wear and banhku U.S. time 8'F M 2063631 f'j and same No. 1 G6
74 't5 No. (7) In each town III FD; j What is the reaction product of the indicated diazonium j, j, i and a large condensing agent containing a reactive carbonyl group such as aldol or acecool? An acid compound of diphenylamine-〇-diazonium salt and formaldehyde (diazo resin) is preferably used. Other useful 41-store cyanide compounds are equity [7]
(No. 49-48001, No. 49-45322, No. 49
It is disclosed in various publications such as -45323.

These photosensitive 11-diazotized compounds of w'1 are generally prepared in the form of water-soluble inorganic salts, and therefore can be coated from an aqueous solution. Alternatively, these water-soluble diazo compounds may be added to the method disclosed in Japanese Patent Publication No. 47-11 [i7].
11^1 or its twin phenolic hydroxyl group, sulfone QQM, or both are reacted with the aromatic or aliphatic n/I group compound, and the reaction product is substantially water-based)
It is also possible to use a photosensitive quediazo resin.

It can be used as a reaction product with hexafluorophosphate or tetrafluoroVlIII as described in JP-A No. 11G5 (i-121031). The diazo resins mentioned are also preferred.

(1) Photosensitive layer consisting of an O-quinonediazide compound Particularly preferred O-quinonediazide compounds are O-natoquinonediazide compounds, such as U.S. Pat.
No. 59112, No. 2907665, No. 304f3
No. 110, No. 3046111, No. 30467'1
No. 5, same No. 3046118? i, IE] No. 3046
119 g, Ii! I 0i3046120, same No. 3
046121 bow, same No. 304Ci122, same No. 304
No. 6123, No. 3061430, No. 31028
(No. 19, No. 3106465, No. 3635709
No. 3647443 Each town of the bow! 11ft (described in many publications including Q, and these can be used suitably.

■Azide compound and binder (photosensitive layer made of a polymer compound) For example, British special i+Q No. 123!1281, same No. 149
'IW I'ijl Ilc+ 5
0-5102 p"7.1rjJ50-84302 No.1.l1j150 84303';j, lil 53
-Acid! described in each publication of No. 12984! The composition includes a polymer containing j and a single molecule compound of l as a binder.

■Other photosensitive 4δ4 oil layer polishing
No. 12277, No. 1313309 Bow Publication, No. 13/
Publications No. 11004, No. 1377747, etc. 1
Polyvinyl cinnamate resin described in the book, Yoneda Toku: 4
Included are the photopolymerizable 7711-polymer compositions described in the specifications of F4072528 and F4072527.

The amount of photosensitive layer provided on the support ranges from about 0.1 to about 70
/m2, preferably 0.5-4 (J/rrt2
is within the range of

After the PS plate is exposed to an image, a 1 + 1 resin image is formed by a conventional process including development.

For example, in the case of a PS plate having a photosensitive layer (1) consisting of a diazo resin and a binder, after image exposure, the unexposed portion of the photosensitive layer is removed by development (a flat-back printing plate is obtained. Is the alkali water soluble after image exposure in the case of the 8th edition? By developing in one step, the exposed portion is removed and a lithographic printing plate is obtained.

Hereinafter, it will be explained in more detail based on Examples.

Example 1 Aluminum alloy No. 1 to No. 1 with the composition shown in Table 1
, 12 was melted and cast, both sides facing each other, H 350mm,
An ingot with a length of 2000 mm was prepared and soaked at a temperature of 550° C. for 10 hours. This was hot rolled at a temperature of 450 to 250°C to a plate thickness of 4.5 mm, and then further thickened to 0.5 mm.
It was cold rolled to 3n+y+ (area reduction rate 93.3%). These were subjected to continuous annealing at 300° C. for 30 seconds through an annealing furnace to produce an aluminum alloy plate for lithographic printing.

Next, an aluminum alloy rolled plate of N 0.1 to N0.12 and N O,13 (plate thickness 0.30 mm) IS 10
50- @ 18 aluminum alloy), No, 14
(Plate thickness 0.30mm LJ I S 1100-111
6 aluminum alloy), No. 15 (plate thickness 0.30 mm
JIS 3003-H14 aluminum alloy) was grained with a rotating nylon brush in a suspension of bumstone water, and then etched using a 20% caustic sorter solution so that the aluminum dissolution rate was 5 g/m2. . After thoroughly washing with running water, pickling with a 25% nitric acid aqueous solution and washing with water, a substrate was prepared. The substrate thus prepared was subjected to alternating current electrolysis at a current density of 20 A/(+1112 or higher) in an electrolytic bath containing 0.5 to 2.5% nitric acid as described in JP-A-54-146234. Subsequently, the surface was cleaned by immersion in an aqueous solution of 15% sulfuric acid at 50°C for 3 minutes, and then an oxide film of 3 g/11 m2 was formed at a bath temperature of 30°C in an electrolytic solution containing 20% sulfuric acid as the main component.

A photographic photosensitive layer was provided on the thus prepared ZAMBLE so that the dry coating amount was 2-50/m<2>.

Naphthoquinone-1,2-diazido-5-sulfonyl chloride and pyrogallol, acetone resin Which ester compound (as described in the old examples of US Patent No. 3F335709)' 0.75!1 Cresol novolak resin 2.00 ( 1 Oil Blue #603 (manufactured by Orient Chemical Co., Ltd.) 0.04 (1 ethylene dichloride IG! + 2-methoxyethyl acetate 12 g) The photosensitive lithographic printing plate thus obtained was brought into close contact with a transparency and 1'IrL
From a distance of
Products sold by Fuji Photo Film Co., Ltd.] and 3
After exposure for 0 seconds, it was developed by immersing it in a 5% by weight sodium silicate aqueous solution for about 1 minute, washed with water, and dried to obtain sample No. 081.
~N0.15 was created.

The uniformity of the electrolytically etched rough surface of the samples No. 1 to No. 15 prepared in this way, the stains in the non-image area, the fatigue strength,
Heat softening! :i M was tested and the results are shown in Table 1.

(Test method) (1) Uniformity of the electrolytic Eppunk rough surface The surface condition was observed using a scanning electron microscope, and the uniformity of the pitch 1'l was evaluated. 0 mark was given for P, and △ mark was given for good. Inferior.

(2) Non-image (gH7) 11 stains Evaluate the stains in the non-image area using the offset printing machine KOR
Poor results are indicated by ◯, good results by △, and poor results by ×. .

(3) Fatigue strength 1a Each muj (from the material to the middle 20 mm, length 100 u
Cut out a test piece of In, fix one end to a jig, bend the other end upward into a 30' square melon, return it to its original position,
Taking this as one time, measure the number of times of Ill and LRi/l-+1 (4) Thermal softening properties of Hahnigbroselli 1300r 12K W Film (+1)”)
The sample was heated to 300°C in a 17°C oven. After cooling, the JIS No. 5 test piece was measured for 0.2% proof stress 1ift using (Tensile test 119).

As is clear from Table 1, the printing aluminum alloy plates No. 081 to No. 097 obtained by the method of the present invention have electrolytic etching uniformity on the A11 surface of 19, stain resistance and fatigue resistance of the non-image area of the stamp. , which satisfies all the requirements of I11 in terms of heat softening resistance and conventional J]S 1050.1.
It can be seen that this is better than 100 and 3003.

On the other hand, aluminum alloy sheet N whose comparative alloy composition is outside the composition range of the aluminum alloy sheet according to the method of the present invention.
It can be seen that in O and E'S~12, the following properties were inferior: uniformity on the 'A11 surface (11), staining of the non-image area during printing, fatigue strength, and heat softening resistance. That is, N with low Mg content
In 018, the uniformity of the rough surface and the staining of the non-image area during printing were good, but the fatigue strength [α, hardness was poor, and M! J,S
i, No.9 to No.11 with high Fc content + have good fatigue strength T; heat resistance is good. ing.

In addition, No. 12, which has a large amount of CLl, has poor uniformity on the 211 side and poor stain resistance in non-image areas during printing.

Example 2 Using alloy ingots No. 2 in Table 1 in J5 in Example 1, soaking treatment was carried out at a temperature of 560°C for 8 hours (1. After hot rolling 11-1 to 0-8.5 mm, cold IJ-rolling with various strips 1'1 shown in Table 2 (○ marks in the table indicate intermediate annealing) ('U
H! ! Annealed C printing aluminum alloy 11 alloy was produced.

Regarding the aluminum base metal plate for printing manufactured in this way, the first experiment was carried out. Samples N0916 to 27 were prepared by surface treatment in the same manner as l 1 and plate making under the same conditions.
,.

Also, for comparison, the conventional JIS1050 (N011 in Table 1)
Regarding component (3), 171 plates were manufactured in the same manner as above under the conditions shown in Table 2, and sample No. 28 was prepared.

These samples were subjected to the same 4XI test as in Example 1 (the results are shown in Table 2).

Table 2
! ('1 (tnm) (am> (%) crystallinity ('
C) Time (seconds) Temperature ('C) Time (seconds) Wood f and light printing 11Z+6 4.5 - 0.3 93 300 15
- -1!17 4.5 - 0.1 98 270
120 - -,, 1n 4,5 - 0.4 9
1 320 10 --,! i94.5-0.58!1
3FIO4o--1,204,500,3933006
0--I・21 11. ! i→4,5 0 0,3
n 280 60 - -ratio (1 11 + 6:lltn 223.0 - 1.056530040--1I23 A
, 5- 0.3 93 20 (160--1124II
IllI38010-1,, 25,, ,, n 300 300 -- Horn 2G,, -1] +, -2207200! ! 27 Ij
Ol1rr --2! io 3[i00? +E:jTl
qllv2Q rr ○ n n --2007200
JIS iO! in Rai Vi? L-touching Non-fatigue strength during printing
17i Softening special issue (102 times) (For strength!
r, /a+l++2) Uniformity of rough surface Image 1fl+'/
) f1 nohit Vertical and horizontal removal 300°Cx before heating
After heating 7m1n ○ ○ G25 436 M, 8 +2.80 0 6
42 440 14.4i 42,20 0 G+8
422 14,6 12. ci00flll'141!
L 44,5 +2J0 0 643 113tl +
4.7 12. [io 0 64! i 423 M, 6
12,8△ △ 602 11111 44.6 1
2.00 0, 4110 307 15.0 13.
00 0 605 1114 418 10.20 0
610 418+0.0 8,3△ △', +88
407 +3.5 12.4△ △ 5! +7 40
3 14.7 12.00 0 275 22 (114
, 37, 8 As is clear from Table 2, after hot working, final cold pressing with an area reduction rate of 70% or more is performed, and then in a continuous annealing furnace at a temperature of 250 to -350'C for 1120 seconds or less. The printing aluminum alloy plates N0.16 to NO, 21, which were thermally annealed by the method of the present invention, had uniformity on the 211th surface, dirt in the non-image area during printing, and annealing in a batch furnace under conventional thermal annealing conditions. ) manufactured printing plate (NO
, 26, No, 27) and
No. 28) The fatigue strength is even better, and the fatigue strength is 1 (more than 960,000 cycles, and the heat softening property after burning at 300℃ for 7 minutes is also good (:) proof stress is 121).
f /' mm 2 or more [-.

A3 N Oo”16~N0.1!lli intermediate annealing (
7) f, ), IJE is No, 20, No,
21 is the case when intermediate annealing is included, and the lifting platform is good.

On the other hand, No. 22, which has a low area reduction rate, has good fatigue strength and heat resistance, but the uniformity of 1'l on 111 surfaces is poor, and the staining of non-image areas during printing is poor. temperature,
111 is outside the scope of the method of the present invention.
For No. 3 to No. 25, the uniformity of the rough surface and the staining of the non-image area during printing are equivalent to the conventional printing plate JIS 1050, but either the fatigue strength or the stain resistance is inferior.

As described above, the aluminum alloy sheet produced by the method of the present invention has superior two-to-one uniformity equivalent to (or even better than) the conventional 1050 aluminum sheet, and is less likely to cause stains in non-Iji image areas during printing. Fatigue strength and heat transfer!1
It has sufficient characteristics and has all the characteristics.517
It has a significant effect as a printing plate.

I4j Continued from page 1 0 Author: Takizawa-Nari 4000 Kawajiri, Yoshida-cho, Haibara-gun, Shizuoka Prefecture Fuji Photo Film Co., Ltd., Yoshida Minami Factory ■Applicant: Fuji Photo Film Co., Ltd. 210 Nakanuma, Minamiashigara City

Claims (1)

[Claims] IVI (10.05~0.30% by weight, S: 0.03~
0430 tonne weight%, F e 0.15-0.40 weight p%,
Ctl Q, 95 city Q% or less, the balance is A (and after soaking an aluminum alloy ingot consisting of ordinary impurities, hot rolling or cold rolling after hot rolling and intermediate furnace '3)li, This is subjected to final cold rolling with an area reduction of 1"870% or more, and then) in a subsequent annealing furnace at 250 to 350°C.
'(7) Method 2 for producing an aluminum alloy lithographic printing plate support, characterized by annealing at a temperature of 120 seconds or less
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