JPS6274693A - Aluminum alloy support for offset print - Google Patents

Abstract

PURPOSE:To obtain excellent strength, burning resistance and grip resistance by containing specific rates of Si, Mg, Zr, and containing most residue of aluminum. CONSTITUTION:0.05-0.7wt% Si, 0.05-3wt% Mg, 0.01-0.25wt% Zr, and the residue of aluminum and unavoidable impurities are contained. Si, Mg provide supporting strength and grip resistance, and obtain uniform grains in electrochemical roughness. 0.01wt% or larger of Zr prevents Mg2Si from increasing to precipitate when a rolling material is finally heat-treated, provides uniformity in the roughness and printing adaptability and improves burning resistance. Further, if Zr exceeds the upper limit of 0.25wt%, it avoids the irregularity of crystal tissue at hot rolling time, thereby eliminating the generation of crystal grain streak.

Description

Detailed Description of the Invention ``Object of the Invention'' The invention relates to the creation of an aluminum alloy support for offset printing, which has adequate surface treatment properties and printability, as well as strength and burning resistance, as well as durability. It is an object of the present invention to provide an aluminum alloy support for offset printing that has excellent cutting properties and is excellent in falling.

Industrial applications: An aluminum alloy support for offset printing that is excellent in strength, burn resistance, and hoe cut resistance.

BACKGROUND OF THE INVENTION Aluminum alloy supports for offset printing are known in the art. In other words, in general, aluminum and aluminum alloys have excellent workability and good surface treatment properties, so they are suitable as supports for offset printing, and are particularly suitable for JIS
1050 (purity of 99.5- or higher), JISIloo
(Affi with purity of 99.0% or more), JIS3003 (
Aluminum or aluminum alloys (hereinafter simply referred to as aluminum alloys) such as At-0, 05-0.2% Cu-1, 0-1.5Mn alloy) are widely used.

After these aluminum alloys are made into plates, their surfaces are roughened by mechanical, chemical, or electrochemical methods, or by a process that combines one or more of these methods, and then anodized. Then, a photosensitive composition (generally a photosensitive resin) is applied to the plate surface, dried, and processed into a so-called 28 plate. Next, this 28 plate is subjected to plate-making processes such as image exposure, development, water washing, and gumming to produce a printing original plate, but this image exposure creates a subsequent layer between the light-reduced area and the unexposed area of the photosensitive resin layer. There is a difference in solubility in the developer solution during the development process, and during the development process, either the exposed area or the unexposed area dissolves in the developer solution or the film is removed, and the other one dissolves in the aluminum plate serving as the support. It remains on top and forms an image. The image area exhibits ink receptivity, and the non-1i1i+ image area where the photosensitive resin is dissolved and removed as described above exhibits water receptivity because the surface of the hydrophilic aluminum support is exposed.

Next, both ends of the printing original plate are bent to form a gripping part for the printing press, and fixed to the cylindrical plate cylinder of the printing press, and dampening water (water or aqueous liquid) is supplied to the plate surface. Because of K, it becomes a non-d+i image part! The film of dampening solution is retained, and the other 1 [! Printing is performed by repeating the steps of supplying ink to the image area II, transferring the ink adhering to the image area to a blanket cylinder, and then transferring it to a paper surface or the like. This printing is applied to a support and is applied to a photosensitive composition which is coated onto a support to suitably pass through the photosensitive composition.
It is possible to obtain as many as 10,000 good-quality prints, and in response to the desire to obtain even more prints (improvement of printing durability), 28 plates are exposed in the conventional manner in the plate-making process. After development, the m7 portion is strengthened by heat treatment at high temperature (referred to as burning treatment, commonly heated at 200 to 280° C. for 3 to 7 minutes).

However, with advances in printing technology in recent years, printing speeds have increased and the stress applied to the printing plate, which is mechanically fixed to both ends of the printing press cylinder, has increased, resulting in increased strength requirements for the support. If the support strength is insufficient, the fixed part may be deformed or damaged, causing problems such as printing misalignment. It is essential to improve heat resistance. As mentioned above, the bending grip part of the printing plate fixed to the plate cylinder is subjected to repeated stress due to contact with the blanket cylinder, resulting in a fatigue fracture phenomenon (referred to as grip breakage), and also due to the processing conditions during the burning process. It is necessary to have adequate durability, and if any one of these is insufficient, the durability will inevitably be lacking.

Therefore, without considering this complicated relationship, the present applicant has proposed a technique as disclosed in Japanese Patent Application Laid-open No. 153861/1983. In other words, this technology reduces zirconium to 0.
．． The aluminum alloy support contains 0.02 to 0.20 wt%.

Also, apart from this, there is a British patent! No. 1421710 specification rose contains 0.4 to 1.2 wt% of magnesium, 0.5 to 1.5 wt% of silicon, and manganese o, o o
An aluminum alloy support containing s~0.4wt% and iron: 0.05~0.5wt% has been proposed and is considered preferable for improving support strength and breakage resistance. There is.

Although the invention aims to solve the trivial problem, the above-mentioned methods cannot adequately meet the above-mentioned requirements in the conventional methods. That is, the one according to JIS1050 is 'IV1. Although a uniform rough surface and appropriate surface roughness can be obtained through vapor chemical roughening treatment, and stains are less likely to occur in non-image areas during printing, the gi of the support is insufficient and the burn resistance is poor. Poor grip and cut resistance. In addition, those according to JIS 3003 have excessive support strength, burn resistance, and grip resistance, but uniform roughness cannot be obtained by electrochemical roughening treatment. Unfortunately, stains in non-image areas also tend to occur during printing.

To deal with these problems, 1538
Although the product according to Publication No. 61 had superior surface treatment properties and printability, and had improved burning resistance,
Regarding the strength level of the support, the JIS 1
It was confirmed that it can be used with something equivalent to 050.

In addition, although the product according to British Patent No. 1421710 has improved support strength and hoeing resistance, it has problems with printability, specifically, staining of non-image areas during printing. This stain in the non-image area is caused by the non-++!
Since this is a phenomenon in which ink is 41 attached to the 11 parts and transferred to the printed matter, this is a major disadvantage for offset printing purposes.

In other words, it is important for an aluminum alloy support for offset printing to have all of the above-mentioned properties in balance and maintain a high level of <4. Even if it has most of the characteristics, if it is inferior in some parts, the industrial value of this oak support, which can obtain clear printing and increase its durability, is due to its inferior characteristics.
However, there is no choice but to limit this, and overall problems still remain.

In particular, in order to prevent stains in non-image areas during printing, it is necessary to improve the water retention and corrosion resistance of non-image areas.
In order to achieve this, it is necessary to obtain the uniformity of the conventionally crushed rough surface and the appearance of a healthy anodized skin by means of surface roughening treatment, particularly pneumochemical deepening treatment.

Means for solving the problems of the invention Si: 0.05 to 0.7 wt% Mg: 0.05 to 3 wt% Zr: Ll, containing 01 to 0.25 wt%, the balance being aluminum Consisting of unavoidable impurities! Features: Aluminum alloy support for offset printing.

Action Sl: 0.05-0.7 wt%+Mg: 0
．． By containing 05-3 wt 4, the support strength and hoe breakage resistance 1r are ensured, and a uniform grain is obtained in electrochemical surface roughening treatment.

By containing 0.01wt% or more of Zrf, coarse precipitation of Mg and Si is prevented during final heat treatment of IE rolled metal, ensuring uniformity in surface roughening treatment and printability, and improving burning resistance. In addition, the total upper limit of 0.25 wt % is achieved by making the crystal structure unrestricted during hot rolling, and thereby preventing crystal grain distortion.

Real m? To explain the invention in more detail, first, the composition of the components contained in the alloy support of the present invention is as follows.

That is, Si: 0.05 to 0.7 wt%, Mg: 0.0
The reason for containing 5 to 3 wt% is to develop the support strength and gripping resistance necessary for the bound state or the Mg, Si phase, and when Sl is O.
If the Mg content is less than 0.01vt%, it will not be possible to obtain an excessive strength level and resistance to hoe cutting, and the problem of plate breakage occurring when mounting the plate as a printing plate or during printing may occur. be. Also, Sl is 0.7vrt%, Mg is 3w
If the content exceeds t%, although the strength will be increased, staining of non-image areas is likely to occur during printing, and furthermore, it may become difficult to control the flatness of the rolled plate, which is not preferable.

In particular, when the required quality is high for the stain resistance of non-image areas during printing, Fe and Mn as unavoidable impurities in the above-mentioned Sl and Mg processing are determined experimentally, and the Mg amount is ≧1.73.
It is desirable to add 770 so as to satisfy the quantitative relationship of the formula:
n) Substantially prevents Si, which is present in an amount greater than that necessary to form a Si phase, from existing in the matrix or in the 14-pole oxide film as a simple substance S1, ensuring a predetermined level of surface roughness and preventing ++! a 11
This is to prevent stains during printing due to a decrease in the durability of the copy.

Zr is used to prevent coarse precipitation of Mg and Si when the rolled material is subjected to final heat treatment, to ensure uniformity and printability in surface roughening treatment, and to significantly improve burning resistance. At 0.01wt, this improvement effect is insufficient, and at over 0.25wt5, the crystal structure becomes non-uniform during hot rolling, resulting in grain streaks, despite having the above-mentioned improvement effect. This is not preferable, and more preferably 0.01 to 0.15 wt%.

F@ and Mn, which are unavoidable impurities in the uninvented association support, have the effect of refining the crystals of the alloy and preventing recrystallization from coarsening, but if any of them exceeds 0.40 wt%, it may cause problems during fishing. Since the Fe-treated Mn-containing gold bridge compound that is formed becomes coarse and completely deteriorates printing performance, it is desirable that each of them is 0.4 wt % or less and the total content is 0.5 vt To or less. Further, it is preferable that Cu and Zn as impurities are both 0.05 wt% or less, and in particular, when the required quality is high for the stain resistance of non-circular image areas during printing, the Cu content is 0.004 to 0.020 wt%. It is necessary to keep it within the range of . Furthermore, Ti and B used as crystal refining agents in the manufacture of slabs have a T1 of 0.
05 wt% or less, B is 0. It is desirable that the OI weight be less than or equal to the OI Wt ratio.

To explain the plate-making and plate-making process of the aluminum alloy support for offset printing of the present invention having the above-mentioned composition, after face-cutting the soaked slab obtained from the molten alloy having the above-mentioned composition, Equalization treatment is carried out by holding at a temperature of ~600°C for 2 hours or more. Next, after passing through the steps of hot rolling and cold rolling, targetization is carried out to obtain a recrystallized structure and to dissolve the Mg and Si phases formed during hot rolling and cold rolling. Perform processing.

Specifically, Gae is 400 ~ in slow ffci #dusouho
Heat to a temperature of 600℃, and after reaching this predetermined temperature, heat to 30℃
Air-cooled to 100℃ or less at a cooling rate of /min or more,
Rapid cooling is preferably performed by water cooling. Continue processing rate 10
% or more, preferably 20% or more cold rolled 0.1-0
．． The plate thickness is 5fi. In addition, before the final cold rolling to be carried out on the day, a tempering treatment is performed by heating and holding at 140°C or less for 2 hours or less using a Kutsuchi type or continuous type annealing device, and then cold rolling is performed at a working degree that provides the specified strength. Rolling can be performed.

Furthermore, if necessary, after the final cold rolling, a tempering treatment may be performed by heating and holding at a temperature of 50 to 350° C. for 2 hours or less using a batch type or continuous annealing device (a). The temperature range when performing the tempering treatment after the final cold rolling is:
(Al-Fe system existing in the plate under the conditions of
)-Si-based compounds are finely dispersed, and the Mg-based Si in the Loe composition is treated so that it is uniformly and finely precipitated as a solid bath or (Mg, Si) phase. It is desired that a given support strength,
It is possible to obtain resistance to hoe cutting, and to ensure uniformity of the grain in the roughened α-filling, and to reduce non-uui 1 during printing.
Two-part staining can be appropriately prevented.

The aluminum alloy plate thus plate-made is subjected to processing as a 28-plate and plate-making processing before being used for actual printing work. That is, first, the surface is roughened by a mechanical graining method or an air chemical graining method, followed by a chemical etching treatment using IS2 or alkali, and a desmutting treatment by pickling. (If necessary, an oxide film is formed by anodizing or chemical conversion treatment, and then an undercoat of alkali metal silicate, hydrophilic cellulose, etc.
Zeng formation treatment is performed. Subsequently, a suitable photosensitive composition is coated and R-analyzed to give a desired grain size, thereby obtaining a 28th plate.

In this PS version-A11!1111! The plate is exposed to light, developed, washed with water, burned, and then plate-made for the gumming number.

After the plate-made printing original plate is bent at both ends to form a gripping portion for the printing press, it is fixed to the cylindrical plate cylinder of the printing press and used for printing work. In this printing work, the handling of the plate is good, there is little deformation when the plate is bent %f, and the gripping resistance of each plate is stable at a high level even when subjected to repeated stress at the bending gripping part.VAj For example 2
Stably achieves excellent printing durability of 0,000 sheets or more.

A specific manufacturing example of the non-inventive product is as follows: a<.

Production example 1 Nine types of aluminum alloys (as shown in Figure 1)
A-K) 'CF611 was used, and because we neglected to use a microporous filter, we produced a 0-thickness slab of 560 mm at DC Futazo, and homogenized the alloy at 560 °C for 4 hours. After the treatment, it was hot-rolled to a thickness of 6 ms, then cold-rolled (temporarily 1.5 m thick for alloy A on the opposite side, and 0.6 m thick for alloys B to J, and then Magnetic Flux I
150 by nd++etion Heating)
Continuous solution treatment by holding at 550°C x 5so = and cooling with water at 500°C/sec at temperature A of Rolled at 180°C using a batch type Sakai blunt furnace in both cases.
After 30 minutes of tempering, the desired aluminum plate for offset ink paulownia was manufactured.

Alloy K was homogenized at 560°C for 4 hours, then hot rolled (6 thick) and cold rolled.
．． 5-thick roots and then at 400°C for 1 hour + i (
After finishing the final rolling process, it was made into a tentative 0.3 mm thickness. In addition, commercially available JISlosO-
H1s2! Four 0.3 gourd plates of JIS-3003-Hlb were used as test materials.

For each of the aluminum pieces obtained as above, the strength of 0.2 pieces per cup was measured by a conventional method, and after crushing the aluminum plate for 7 minutes in a salt bath kept at 270℃ as a heat-resistant finger float. 0 due to the tensile theory of
, 2-inch yield strength was measured.

I used a 1-star rating for slenderness and fatigue strength to evaluate the sharpness of the grip, but from the aluminum cost, the corner was 32mm and the length was 60mm.
Cut out a piece of +ma wiping scissors, pre-bend it to an angle of 90'' using a printing board assembly bender with a bending radius of 1.5frR, then fix one end with a jig and give a constant amplitude to the other end. The number of times it took for the bent part to break was measured.

-10,000, above 131! A similar alloy plate was treated as a printing support, and the roughness and the soundness of the anodic oxide film were evaluated. That is, these aluminum alloy plates were grained with a rotating nylon brush in a solution of pumice stone and water, etched with a caustic solder in a 20 wt% water bath, then washed with water, and etched in a 25 wt% nitric acid water bath. After pickling and washing with water, 0.5 to 2.5 w of nitric acid is added.
AC electrolysis was carried out at a current density of 20 A/c/- or higher in an electrolytic bath containing 20 wt% sulfuric acid, followed by immersion in a 50°C aqueous solution of 15 wt sulfuric acid for 3 minutes to clean the surface. Anodic and arctic treatment was carried out at a bath temperature of 30° C. while dissolving t as the main component.

The roughness of the support obtained as described above was evaluated by performing SEN rupture on the surface, and the uniformity of the grain was evaluated.Also, the base aluminum was dissolved in a bromine-methanol solution to remove only the oxide film. It was taken out and subjected to TEM and imaging to evaluate the second phase particles remaining in the film.

The results of these measurements and observations are shown in Table 2 below. Note that the mechanical properties were all measured in a direction parallel to the rolling direction (L direction).

That is, alloy A-G, which is an uninvented material, has a support strength (0.2%
In terms of yield strength), burning resistance (0.2% yield strength after heating), and gripping resistance (pre-bending fatigue strength), it is equivalent to or better than comparative materials and high-level conventional materials. The level is improving. Furthermore, the surface roughening properties and anodic oxidation film properties were as good as JIS 1050-H18.

Although comparative materials H, I, and J have good mechanical properties, H and! In this case, many unnecessary second phase particles of 0.1μ or more were found in the anodic oxide film, and 81 elements were detected from these particles by EDX analysis. Also, comparison material J is Z
Because r is below the specified value, the 0.2% yield strength after heating at 270°C x 7 min is inferior, and the comparative material is JIS1
Even though it has the same roughening properties and the soundness of the anodic oxide film as 050-Hl8, the support strength is significantly inferior. Conventional material JIS1050-Hl8 machining JIS 30
03-Hl 6 remains at a low level in support strength, burning resistance, surface roughening properties, and anodic oxide film integrity.

Production Example 2 Inventive material C obtained in Production Example 1 and comparative materials I and J were continuously rolled under the same conditions as Production U11 using 0.6 as thick cold-rolled plates before static treatment. After being subjected to solidification and water quenching, and then left at room temperature for about one day, only the final cold rolling was performed as shown in Table 3 below. An alloy plate with a thickness of 0.3 m was obtained by combining either or both of them with a return of φ.

The obtained seven types of alloy plates and conventional materials JIS1050
-Hl8 (0.3m thick) and JIS3003H16 (0.3m thick)
3 mm thick) was further subjected to a plate-making process as a printing plate, and evaluated as a printing plate. That is, the following photosensitive layer was applied to a support prepared by the same method as described in Production Example 1, with a dry coating amount of 2.5 f/lt? It was formed into a shape.

Compound of naphthoquinone-1,2-diazido-5-sulfonyl chloride with topyrogallol acetone resin (US Pat. No. 365709 No. 0.75f)
Cresol novolak resin 1oot Oil Blue #603 (manufactured by Orient Chemical Co., Ltd.) o, 04 y Ethylene dichloride 16t 2-methoxyethyl acetate 12f Obtained photosensitive lithographic printing plate t
- Ps light (Toshiba metal halide lamp MU2000-2-OLm, 3
After exposure for 30 seconds with a light source of KW (with a KW light source), the plate was immersed in a sodium silicate SW wt aqueous ice solution for about 1 minute to form a gap, washed with water and dried to obtain a printing original plate.

These printing original plates were subjected to the same tests as in Production Example 1, and were also installed in an offset printing machine KOH to observe stains in the non-image area. The results are shown in Table 3 below.

In other words, it is clear from these three results that the material of the present invention remains cold-pressed after solution treatment, or is subjected to I & final cold fltl rolling.
It has the advantage of being able to freely vibrate the support strength at a higher level than conventional materials that are later subjected to resetting treatment, and also has JIS 1050 in terms of rough surface resistance and printability.
- It has the same level of performance as H2O.

``Effects of the Invention'' When using the uninvented aluminum alloy support for offset printing as explained above, the specific yield, roughening property and impression properties are equal to or higher than that of the pressing rice fang, and the support strength is also higher. Craftsmanship: Since it has an excellent cutting edge, it can appropriately eliminate problems caused by deformation when installing the plate and unremarkable slippage during printing, and also improves burning resistance. , it is possible to provide a highly durable product, and this is a highly effective defense in terms of confectionery.

Claims (1)

[Claims] Si: 0.05 to 0.7wt. % Mg: 0.05-3wt. % Zr: 0.01-0.25wt. %, with the remainder consisting of aluminum and unavoidable impurities.