KR101365344B1 - Aluminum alloy plate for printing plate and manufacturing method thereof - Google Patents

Abstract

Provided is an aluminum alloy plate for a printing plate which is excellent in electrolytic roughening properties and tensile strength and which reduces manufacturing costs and surface scratches.
As an aluminum alloy plate for a printing plate subjected to electrolytic roughening treatment and used as a support for a printing plate, Si: 0.03 to 0.15 mass%, Fe: 0.2 to 0.6 mass%, Ti: 0.005 to 0.05 mass%, Ni: 0.005 to 0.10 mass And at least one selected from Mn: 0.005 to 0.05% by mass, Mg: 0.005 to 0.05% by mass and Cu: 0.005 to 0.05% by mass, and the balance has a composition consisting of Al and inevitable impurities, Further, the number density of Ni-containing intermetallic compounds produced by cold rolling without performing intermediate annealing and having a maximum length of 1 to 10 µm among the intermetallic compounds present on the plate surface is 200 to 4000 pieces / mm ^2. It is characterized by that.

Description

Aluminum alloy plate for printing plate and manufacturing method thereof {ALUMINUM ALLOY PLATE FOR PRINTING PLATE AND MANUFACTURING METHOD THEREOF}

TECHNICAL FIELD This invention relates to the aluminum alloy plate for printing plates especially used as a support body of printing, especially a flat printing plate, and its manufacturing method.

Generally, what provided the photosensitive layer on the support body is used as a photosensitive flat plate of a flat plate printing. As the support, an aluminum alloy plate is often used. The surface of such a support body is roughened in order to improve the adhesiveness of the photosensitive layer with respect to a support body, and the water retention property of a non-image part. As the method of the roughening treatment, electrochemically roughening the surface of the aluminum alloy plate using a mechanical treatment method such as a ball polishing method or a brush polishing method, an electrolytic solution mainly containing hydrochloric acid or nitric acid, or an electrolyte solution mainly containing nitric acid The electrolytic roughening treatment method, the treatment method which combined these mechanical treatment methods, and the electrolytic roughening treatment method, etc. are mentioned. Among these roughening treatment methods, the obtained roughening plate exhibits high plate making titration and printing performance, and is suitable for continuous treatment with a coil material, and thus an electrolytic roughening treatment method is suitably used. Therefore, the aluminum alloy plate used as a support body is required to be excellent in what is called electrolytic roughening characteristic and tensile strength, such as the unetch rate by electrolytic roughening process and the uniformity of the surface after electrolytic roughening process.

As an aluminum alloy plate suitable for the electrolytic roughening method, there exist some described in patent document 1, for example. Patent Document 1 contains 0.20 to 0.6 mass% of Fe, 0.03 to 0.15 mass% of Si, 0.005 to 0.05 mass% of Ti, 0.005 to 0.20 mass% of Ni, and 0.005 to 0.05 mass% of Mg. At least one element selected from the group consisting of Mn, Cr, and Zr contains 0.005 to 0.030 mass% per element, the content of Mn, Cr, and Zr is 0.005 to 0.030 mass% in total, and the balance is Al and inevitable. An aluminum alloy plate for a printing plate, which is made of an impurity, is described.

In addition, Patent Literature 1 discloses a method for producing such an aluminum alloy plate for printing plates, in which the aluminum alloy ingot having the composition described above is subjected to homogenization heat treatment at a temperature of 500 to 630 ° C, and then the starting temperature is 400 to 450 ° C. After performing a hot rolling, the manufacturing method of the aluminum alloy plate for printing plates which has a cold rolling process and an intermediate annealing process is described.

According to the technique of patent document 1, even if it is a short time electrolytic roughening process, it is described that roughening pit is distributed uniformly on the surface, and the size of each pit becomes substantially constant.

Japanese Patent No. 2778662

However, in order to manufacture the aluminum alloy plate of patent document 1 suitably, since the intermediate annealing needs to be performed, it was difficult to reduce manufacturing cost. In addition, when performing intermediate annealing by continuous annealing, since it contacted many rolls further, the surface was easy to be damaged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and is excellent in electrolytic roughening properties and tensile strength, which are naturally required as a supporting plate of a printing plate, and also reduces manufacturing costs and surface scratches, and an aluminum alloy plate for a printing plate and a manufacturing method thereof. The task is to provide.

In order to solve the said subject, the aluminum alloy plate for printing plates which concerns on this invention is an aluminum alloy plate for printing plates in which electrolytic roughening process is performed and used as a support body of a printing plate, Si: 0.03-0.15 mass%, Fe: 0.2- 0.6% by mass, Ti: 0.005 to 0.05% by mass, Ni: 0.005 to 0.10% by mass, and Mn: 0.005 to 0.05% by mass, Mg: 0.005 to 0.05% by mass and Cu: 0.005 to 0.05% by mass The maximum length is 1-10 micrometers among the intermetallic compounds which contain at least one, and remain by the cold rolling which has a composition which consists of Al and an unavoidable impurity, and does not perform intermediate annealing, and exists in a board surface. The number density of the phosphorus Ni-containing intermetallic compound is characterized by being 200 to 4000 pieces / mm ² .

Thus, since Si, Fe, and Ti are contained in content of a specific range, the formation of the initial pit at the time of electrolytic roughening process can be promoted, and uniformity of a rough surface can be improved. In addition, since Ni is contained in a specific range of content, the chemical solubility of the aluminum alloy plate is improved, the amount of etching during the electrolytic roughening treatment increases, and uniform electrolytic roughening (by electrolytic roughening treatment in a short time). The roughened surface, which is the same below, can be formed. In particular, in the present invention, since it is produced by cold rolling without performing intermediate annealing, solid solution of Ni-containing intermetallic compound having a maximum length precipitated on the surface of 1 to 10 µm is suppressed and the number of the intermetallic compounds is suppressed. The uniformity of density and precipitation distribution is maintained. Therefore, the chemical solubility of an aluminum alloy plate improves and the etching amount at the time of electrolytic roughening process increases. Thereby, it is possible to further promote the formation of the initial pit at the time of the electrolytic roughening treatment, to form a uniform electrolytic roughening surface in a short time, and to have excellent electrolytic roughening characteristics. And since Mn, Mg, and Cu are contained in content of a specific range, sufficient strength can be obtained.

The manufacturing method of the aluminum alloy plate for printing plates which concerns on this invention is a manufacturing method for manufacturing the said aluminum alloy plate for printing plates, The casting process of casting the ingot of the aluminum alloy which has the said composition, and the said ingot 380-550 A homogenization heat treatment step of performing a homogenization heat treatment at 0 ° C., a hot rolling step of producing a rolled plate by hot rolling the ingot subjected to homogenization heat treatment to a rolling end temperature of 300 to 370 ° C., and an intermediate annealing with respect to the rolled plate. It is characterized by including the cold rolling process of performing cold rolling which does not carry out.

Thus, by casting the ingot of the aluminum alloy having the above-mentioned composition in the casting step, and performing a homogenization heat treatment of a specific temperature range in the homogenizing heat treatment step, the number density of the intermetallic compound on the surface of the ingot of the aluminum alloy having the composition Precipitation distribution can be made uniform. The ingot subjected to homogenization heat treatment in the subsequent hot rolling step can be subjected to hot rolling in which the rolling end temperature is within a specific range, thereby maintaining the uniformity of the number density and precipitation distribution of the intermetallic compound. And since an intermediate annealing is not performed in the cold rolling process performed subsequently, manufacturing cost can be reduced. In addition, since no intermediate annealing is performed, contact with a large number of rolls is eliminated, and as a result, surface scratches can be reduced.

According to the present invention, such as unetching rate according to the electrolytic roughening treatment and uniformity of the surface after electrolytic roughening treatment, it is excellent in electrolytic roughening characteristics and tensile strength, which are naturally required as a support of the printing plate, The aluminum alloy plate for printing plates which reduced the wound can be provided.

Further, according to the present invention, such as the non-etching rate according to the electrolytic roughening treatment and the uniformity of the surface after the electrolytic roughening treatment, the electrolytic roughening characteristics and tensile strength naturally required as the support of the printing plate are excellent, and the manufacturing cost and The manufacturing method for manufacturing the aluminum alloy plate for printing plates which reduced the surface wound can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a flowchart explaining the process of the manufacturing method of the aluminum alloy plate for printing plates which concerns on this invention.

Next, the form for implementing the aluminum alloy plate for printing plates which concerns on this invention, and its manufacturing method is demonstrated in detail.

[Aluminum alloy plate for printing plate]

First, the aluminum alloy plate for printing plates which concerns on one Embodiment of this invention is demonstrated. The aluminum alloy plate for printing plates according to one embodiment of the present invention is subjected to electrolytic roughening treatment and used as a support for the printing plate.

Such an aluminum alloy sheet for printing plate contains Si: 0.03 to 0.15 mass%, Fe: 0.2 to 0.6 mass%, Ti: 0.005 to 0.05 mass%, Ni: 0.005 to 0.10 mass%, and Mn: 0.005 to 0.05 mass %, Mg: 0.005 to 0.05 mass% and Cu: at least one selected from 0.005 to 0.05 mass%, the remainder having a composition consisting of Al and unavoidable impurities, by performing cold rolling without performing intermediate annealing Among the intermetallic compounds produced and present on the plate surface, the number density of Ni-containing intermetallic compounds having a maximum length of 1 to 10 µm is 200 to 4000 pieces / mm ² .

(Si: 0.03-0.15 mass%)

Si forms an Al-Fe-Si-based intermetallic compound to promote the formation of initial pits during the electrolytic roughening treatment, thereby suppressing the occurrence of unetched portions and improving the uniformity of the electrolytic roughening surface. It also has the effect of improving the strength of the aluminum alloy plate.

If the amount of Si is less than 0.03 mass%, the formation of the initial pit is insufficient because the intermetallic compound is insufficient. As a result, the unetched portion (rate) increases and the electrolytic roughness becomes nonuniform. In addition, the strength of the aluminum alloy plate is also insufficient.

On the other hand, when Si amount exceeds 0.15 mass%, a crude intermetallic compound is formed. As a result, the electrolytic roughness becomes nonuniform.

The amount of Si is preferably 0.05 to 0.13 mass%, more preferably 0.05 to 0.10 mass%.

(Fe: 0.2 to 0.6 mass%)

Fe forms an Al-Fe-based intermetallic compound to promote the formation of initial pits during the electrolytic roughening treatment, suppresses the occurrence of unetched portions, and improves the uniformity of the electrolytic roughening surface. It also has the effect of improving the strength of the aluminum alloy plate.

If the amount of Fe is less than 0.2% by mass, the formation of initial pits is insufficient because of the lack of intermetallic compounds. As a result, the non-etching portion increases and the electrolytic roughness becomes uneven. In addition, the strength of the aluminum alloy plate is also insufficient.

On the other hand, when Fe amount exceeds 0.6 mass%, a crude intermetallic compound is formed. As a result, the number density of Ni-containing intermetallic compounds having a maximum length of 1 to 10 µm increases, and the electrolytic roughness becomes uneven.

The amount of Fe is preferably 0.3 to 0.5 mass%.

(Ti: 0.005 to 0.05 mass%)

Ti has the effect of refining ingot tissue. In general, when Ti is added, ingot refiner (TiB) having a ratio of Ti: B = 5: 1 is melted in the form of waffles or rods (by melting, inclusion filter, degassing apparatus, melt flow rate). Molten metal before slab solidification, which is introduced into either of the control devices. Therefore, B in accordance with the content ratio is inevitably added.

If the amount of Ti is less than 0.005% by mass, the miniaturization effect is insufficient, which also adversely affects the uniformity of the electrolytic roughening.

On the other hand, when the Ti amount exceeds 0.05% by mass, the miniaturization effect is saturated, and coarse intermetallic compounds are formed. As a result, the electrolytic roughness becomes nonuniform.

The amount of Ti is preferably 0.008 to 0.04 mass%, more preferably 0.008 to 0.02 mass%.

(Ni: 0.005 to 0.10 mass%)

Ni improves the chemical solubility of an aluminum alloy plate, and increases the etching amount at the time of electrolytic roughening process. In addition, an Al-Fe-Si-Ni-based intermetallic compound is formed. Since the intermetallic compound has a higher electrochemical potential than that of the Al-Fe-Si-based intermetallic compound, the formation of initial pits during electrolytic roughening can be further promoted. Therefore, it becomes possible to form a uniform electrolytic roughening surface in a short time.

If the amount of Ni is less than 0.005% by mass, the improvement of chemical solubility is insufficient and the ability to form the initial pit is insufficient. As a result, the electrolytic roughness becomes nonuniform and the non-etching rate increases. Moreover, the number density of Ni containing intermetallic compound whose maximum length is 1-10 micrometers becomes small.

On the other hand, if the amount of Ni exceeds 0.10 mass%, the chemical solubility is excessively promoted, so that the uniformity of the pits on the electrolytic rough surface is impaired. In addition, since many Al-Fe-Si-Ni-based intermetallic compounds are formed, the strength of the aluminum alloy plate is also insufficient.

It is preferable to make Ni amount into 0.007-0.08 mass%. The upper limit of Ni may be 0.03 mass%, 0.02 mass%, or the like.

(Mn: 0.005 to 0.05% by mass, Mg: 0.005 to 0.05% by mass and Cu: at least one selected from 0.005 to 0.05% by mass)

Either Mn, Mg, and Cu have an effect of improving strength by solid solution in an aluminum alloy plate.

If the amount of Mn, Mg and Cu is less than 0.005% by mass, the effect is small.

On the other hand, when Mn amount, Mg amount, and Cu amount exceed 0.05 mass%, respectively, a crude intermetallic compound is formed. As a result, the electrolytic roughness becomes nonuniform.

In addition, the upper limit of Mn can be made into 0.04 mass%, 0.02 mass%, 0.01 mass%, etc.

The upper limit of Mg can be 0.03 mass%, 0.02 mass%, 0.01 mass%, or the like.

Although the upper limit amount of Cu can be 0.03 mass%, 0.01 mass%, etc., there exists a tendency for a non-etching part to increase as content increases.

(The balance is Al and unavoidable impurities)

The balance is Al and inevitable impurities. Examples of unavoidable impurities in the present invention include Zn, Cr, Zr, Ga, V and the like. Since these unavoidable impurities do not impair the desired effect of this invention in total content of 0.05 mass% or less, it can be allowed to contain in a composition until the said content.

(Production by cold rolling without performing intermediate annealing)

By performing cold rolling without performing an intermediate annealing, manufacturing cost can be reduced. In addition, since intermediate annealing by continuous annealing is not performed, it does not contact with many rolls. Therefore, the wound of the board | plate material surface can be reduced. As a result, it is possible to easily determine whether or not intermediate annealing has been performed by examining the presence or absence of the wound.

(The number density of Ni-containing intermetallic compounds having a maximum length of 1 to 10 µm among the intermetallic compounds present on the surface of the plate is 200 to 4000 pieces / mm ² )

The intermetallic compound containing Ni, such as an Al-Fe-Si-Ni-based intermetallic compound, acts as a starting point of the initial pit during the electrolytic roughening treatment, and significantly affects the etching property and roughness uniformity. As described above, the Al-Fe-Si-Ni-based intermetallic compound, which is an intermetallic compound containing Ni, has a higher electrochemical potential than the Al-Fe-Si-based intermetallic compound, which is another intermetallic compound. The formation of the initial pit at the time of electrolytic roughening treatment is further promoted. As a result, a uniform electrolytic roughening surface can be formed in a short time.

If the number density of the Ni-containing intermetallic compound having a maximum length of 1 to 10 µm is less than 200 pieces / mm ² , the formation of initial pits will be insufficient, resulting in deterioration of etching properties and roughness.

On the other hand, when the number density of Ni containing intermetallic compound whose maximum length is 1-10 micrometers exceeds 40OO piece / mm < ² >, coarse pits will be easy to form. As a result, the electrolytic roughness becomes nonuniform.

On the other hand, it is preferable that this number density shall be 670-2830 pieces / mm <^2> .

The measurement of the number density of such an intermetallic compound is, for example, polishing the surface of an aluminum alloy plate with a buff or the like to make a mirror surface, and the mirror surface is 500 times the reflection electron image of a scanning electron microscope (SEM). It can carry out by observing at the magnification of, and calculating the number density (piece / mm <^2> ) of an intermetallic compound by image analysis from the photograph of 50 views in total. On the other hand, even by the measurement by SEM, it is difficult to accurately count the intermetallic compound having a maximum length of less than 1 μm, and the intermetallic compound having a maximum length of less than 1 μm is substantially dependent on etching properties and roughness uniformity. There is no significant effect. Therefore, the maximum length was made into 1 micrometer or more corresponding to the measurement of the number density of the said intermetallic compound. Further, from the composition and manufacturing conditions of the aluminum alloy plate for printing plate according to the present invention, the maximum length of the intermetallic compound rarely exceeds 10 mu m, and it is insufficient to consider this. Therefore, the maximum length was set to 10 micrometers or less corresponding to the measurement of the number density of the said intermetallic compound.

[Manufacturing method of aluminum alloy plate for printing plate]

Next, the manufacturing method of the aluminum alloy plate for printing plates which concerns on one Embodiment of this invention is demonstrated.

The manufacturing method of the aluminum alloy plate for printing plates which concerns on one Embodiment of this invention is a manufacturing method for manufacturing said aluminum alloy plate for printing plates, A casting process (S1), a homogenization heat treatment process (S2), a hot rolling process ( S3) and cold rolling process (S4).

(Casting process)

Casting process S1 is a process of casting the ingot of the aluminum alloy which has said composition.

(Homogenization Heat Treatment Process)

Homogenization heat processing process S2 is a process of homogenizing heat processing of the ingot cast at the casting process S1 at 380-550 degreeC.

By performing the homogenization heat treatment, in addition to the intermetallic compound precipitated at the time of casting of the ingot, the intermetallic compound precipitated at the time of homogenization heat treatment of the ingot can also act as an initial pit. Therefore, a uniform electrolytic roughening surface can be obtained.

When the temperature of the homogenization heat treatment is less than 380 ° C, in addition to insufficient homogenization, the amount of precipitation of the intermetallic compound containing Ni is small and the number density after cold rolling is insufficient, so that formation of the initial pit becomes difficult to be promoted. As a result, inferior etching property and uniformity are inferior. In addition, dynamic recrystallization during rolling is insufficient, resulting in uneven crystal structure of the rolled sheet.

On the other hand, when the temperature of homogenization heat treatment exceeds 550 degreeC, since the subsequent hot rolling temperature will become high and crystal grain will grow too much, the uniformity of an electrolytic roughening surface will be impaired. Therefore, what is necessary is just to perform the temperature of homogenization heat processing at 380-550 degreeC, and to set it as 380-530 degreeC.

By the way, when the temperature of homogenization heat processing exceeds 505 degreeC, Ni-containing intermetallic compound whose maximum length which precipitated at 380 degreeC or more is 1-10 micrometers redistributes, and a non-etching rate will become slightly high. Therefore, the more preferable range of the homogenization heat treatment temperature is 380-505 degreeC, and the more preferable range is 420-505 degreeC. Homogenization heat processing time should just be able to fully homogenize, and can be set suitably. Although it does not specifically limit, For example, it can be made into about 4 hours. On the other hand, economically, within 24 hours is preferable.

(Hot rolling process)

The hot rolling step (S3) starts hot rolling immediately without performing in-furnace cooling and reheating of the ingot at the temperature at which the homogenization heat treatment step (S2) has been performed in the homogenization heat treatment step (S2), and the rolling finish temperature (winding temperature of the rolled sheet) It is a process of manufacturing a rolled board so that it may become 300-370 degreeC.

As described later, in the present invention, the rolled sheet produced by hot rolling is subjected to cold rolling without performing intermediate annealing, thereby forming an aluminum alloy sheet for printing plate. Therefore, in order to ensure the uniformity of an electrolytic roughening surface, it is required for a board | plate material to have a uniform metal structure as much as possible. Therefore, the rolled sheet needs to be recrystallized when the hot rolling is finished.

If the rolling finish temperature of hot rolling is less than 300 degreeC, since a rolling plate does not recrystallize after winding, the uniformity of an electrolytic roughening surface will be inferior.

On the other hand, when the rolling finish temperature of hot rolling exceeds 370 degreeC, a grain size will become coarse and a large structure will be coarse, and the uniformity of an electrolytic roughening surface will be inferior.

(Cold rolling process)

Cold rolling process S4 is a process of manufacturing the aluminum alloy plate for printing plates by performing cold rolling which does not perform intermediate annealing with respect to the rolling board hot-rolled in hot rolling process S3.

By performing cold rolling process S4, it adjusts to the thickness required as an aluminum alloy plate for printing plates. As described several times so far, in the present invention, no intermediate annealing is performed in cold rolling. The reason for this is that the intermetallic compound is not dissolved or refined by intermediate annealing. In addition, by not performing intermediate annealing, reduction of the manufacturing cost and wound reduction of the surface by contact with many rollers are aimed at.

The aluminum alloy plate manufactured by the manufacturing method described above contains Si: 0.03 to 0.15 mass%, Fe: 0.2 to 0.6 mass%, Ti: 0.005 to 0.05 mass%, Ni: 0.005 to 0.10 mass%, and Mn. : 0.005 to 0.05 mass%, Mg: 0.005 to 0.05 mass% and Cu: at least one selected from 0.005 to 0.05 mass%, the remainder having a composition consisting of Al and unavoidable impurities, and cold not subjected to intermediate annealing Among the intermetallic compounds produced by rolling and present on the plate surface, the number density of Ni-containing intermetallic compounds having a maximum length of 1 to 10 µm is 200 to 4000 pieces / mm ² . This aluminum alloy sheet is excellent in electrolytic roughening characteristics, which are naturally required as a support of a printing plate, such as unetching rate by electrolytic roughening treatment and uniformity of surface after electrolytic roughening treatment, and also provides manufacturing cost and surface scratches. It is very effective as an aluminum alloy plate for printing plates.

On the other hand, the manufacturing method of the aluminum alloy plate for printing plates which concerns on this invention is as having demonstrated above, Although the aluminum alloy plate for printing plates which concerns on this invention mentioned above can be manufactured suitably already, In each of the said processes in performing this invention, Other processes may be included between or before and after each of the above steps in a range that does not adversely affect.

As such another step, for example, the surface of the ingot obtained in the casting step (S1) is faced to a certain thickness dimension to remove segregation, and an aluminum alloy plate or a linear defect in which hot rolling cracks are formed. The process of detecting this produced aluminum alloy plate and removing it from a production line, the process of unwinding from a coil after a cold rolling process (S4), and cutting | disconnecting to predetermined length, etc. are mentioned.

Example

Next, the Example which confirmed the effect of this invention is demonstrated.

[1] About composition

The aluminum alloy which concerns on Examples 1-10 and Comparative Examples 1-13 of the composition shown in Table 1 was prepared. In addition, the aluminum alloy which concerns on Examples 1-10 and Comparative Examples 1-13 is shown in Table 1 as Alloy 1-23.

Examples 1 to 10 and Comparative Examples 1 to 13 of the compositions shown in Table 1 were faced after casting the ingot to have a thickness of 550 mm. Immediately after performing the homogenization heat treatment of the chamfered ingot for 480 degreeC x 4 hours, hot rolling was started, hot rolling was complete | finished so that rolling end temperature might be 330 degreeC, and the rolled plate of thickness 3mm was produced. And the cold rolling which does not perform an intermediate annealing with respect to this rolled sheet was performed, and the aluminum alloy plate of thickness 0.3mm was manufactured. In addition, the annealing was not performed also before and after cold rolling.

For the aluminum alloy plates according to Examples 1 to 10 and Comparative Examples 1 to 13 thus produced, the number density of Ni-containing intermetallic compounds having a maximum length of 1 to 10 µm was measured to evaluate tensile strength and hydrochloric acid. Evaluation was carried out for the roughening treatment.

The number density of the Ni-containing intermetallic compound having a maximum length of 1 to 10 µm is mirror surface by polishing the surface of the aluminum alloy plate according to Examples 1 to 10 and Comparative Examples 1 to 13 with buffing or the like, and the mirror surface is mainly It observed with the magnification of 500 times with the reflection electron image of a dead electron microscope (SEM). The number density (piece / mm <^2> ) of an intermetallic compound was computed by image analysis from the photograph of 50 views in total.

Tensile strength is produced by cutting out JIS No. 5 test piece (according to JIS Z 2201) from the aluminum alloy sheet according to Examples 1 to 10 and Comparative Examples 1 to 13 so that the direction parallel to the rolling direction becomes the longitudinal direction. The tensile test was done based on Z 2241, and the tensile strength was measured. The measurement of tensile strength was performed about the case of the board | substrate raw material which does not carry out the burning process, and the case after baking process a test piece.

The baking process was performed by inserting a test piece into the air furnace set to the atmospheric temperature of 250 degreeC, taking out from a furnace after 10 minutes passed after the atmosphere temperature reached 250 degreeC again after closing a furnace cover. In the case of the board | plate material as it is (the "alloy plate material" in Table 1), the tensile strength according to the tensile test made it preferable that tensile strength is 170 MPa or more, and made it the defect that tensile strength was less than 170 MPa. In addition, in the case after the baking treatment, the tensile strength was preferably 130 MPa or more, and the tensile strength was less than 130 MPa. In view of the above criteria, the evaluation of the tensile strength of the good material in the case of the sheet material as it is or the case after the firing treatment is referred to as "○", and the evaluation of the tensile strength of at least one of the defective ones is "x" in Table 1 Listed.

Evaluation of the roughening process by hydrochloric acid was performed based on non-etching part evaluation and uniformity evaluation.

First, in making these evaluations, the roughening process by hydrochloric acid was performed on condition of the following.

The roughening process by hydrochloric acid neutralized and wash | cleaned the aluminum alloy plate in 5 mass% sodium hydroxide aqueous solution for 50 second, and temperature for 30 second, and room temperature and 30 second in 1 mass% nitric acid. The alternating electrolytic roughening process was performed by the method of electrolytically treating the neutralized wash | cleaned aluminum alloy plate for 10 second in electrolytic conditions of the current density of 120 A / dm <^2> , the frequency of 50 Hz, and the temperature of 25 degreeC in 2 mass% hydrochloric acid.

The electrolytic roughening-treated aluminum alloy plate was treated with a death mat at a temperature of 50 ° C. for 10 seconds in a 5 mass% sodium hydroxide aqueous solution, and neutralized and washed for 30 seconds at room temperature in 30 mass% nitric acid. And water washing and drying were performed and this was made into the evaluation sample.

In the non-etching part evaluation, the surface of the above-mentioned evaluation sample was subjected to surface observation using a scanning electron microscope (SEM) at 50,000 times to take a picture so that the viewing area becomes 1 mm ² as a whole, and based on this picture, The non-etching rate [%] was calculated | required from the method shown by following formula (1).

Unetched part evaluation was performed from the obtained non-etching rate [%]. In the non-etching part evaluation, the non-etching rate is 0 to 3%, and the non-etching rate is 3 to 5%. It was set as x (defect). In this specification, (circle) or (circle) was made pass and x was rejected.

Uniformity evaluation was performed as follows. First, the surface roughness of the said evaluation sample was observed 2000 times using SEM, and this was photographed. All of these photographs were drawn three parallel lines of 100 cm in total length, and uniformity was evaluated by finding the difference between the maximum and minimum pit sizes (maximum length) under the line. For uniformity evaluation, the difference in the size of the pit is 1 µm or less, ◎ (very good), and the difference in the size of the pit is 1 (good), which is 2 µm or less, and more than 2 µm × It was (bad). In this specification, (circle) or (circle) was made pass and x was rejected.

The tensile strength of the aluminum alloy compositions according to Examples 1 to 10 and Comparative Examples 1 to 13 and the number density of Ni-containing intermetallic compounds having a maximum length of 1 to 10 µm are shown in Table 1 below. The measurement result and the evaluation result about the roughening process by hydrochloric acid are also shown.

On the other hand, the aluminum alloys according to Examples 1 to 10 and Comparative Examples 1 to 13, that is, the alloys 1 to 23 contain unavoidable impurities in addition to the components of the contents shown in Table 1. The sum total of each component and an unavoidable impurity becomes 100 mass%. "-" In Table 1 shows that the corresponding component is not added, and the underline in Table 1 shows that it does not satisfy the requirements of the present invention.

As shown in Table 1, in Examples 1 to 16, since the composition of the aluminum alloy satisfies the requirements of the present invention and the manufacturing conditions are also suitable, the evaluation of the tensile strength and the roughening treatment by hydrochloric acid are performed. Evaluation (ie, non-etching part evaluation and uniformity evaluation) was excellent. In particular, Examples 1 to 4, 6, 8, and 9 had very good non-etching part evaluation and uniformity evaluation.

On the other hand, in Comparative Examples 1 to 13, since the composition of the aluminum alloy does not satisfy the requirements of the present invention, the evaluation of the tensile strength and the roughening treatment by hydrochloric acid (that is, the unetched portion evaluation and / or At least one of uniformity evaluation) was inferior.

Specifically, in Comparative Example 1, since the amount of Si was less than the lower limit, the tensile strength after the firing treatment was poor, and evaluation of the tensile strength failed. In addition, the non-etching part evaluation and the uniformity evaluation became poor, and the evaluation about the roughening process by hydrochloric acid failed.

In Comparative Example 2, since the amount of Si exceeded the upper limit, the tensile strength of the sheet material as it was and after the firing treatment became poor, and evaluation of the tensile strength failed. In addition, uniformity evaluation was poor, and evaluation of the roughening process by hydrochloric acid failed.

In Comparative Example 3, since the Fe content was less than the lower limit, the tensile strength of the sheet material as it was and after the firing treatment became poor, and evaluation of the tensile strength failed. In addition, unetched part evaluation and uniformity evaluation became poor, and evaluation about the roughening process by hydrochloric acid failed.

Since the amount of Fe exceeded the upper limit in the comparative example 4, uniformity evaluation became bad and evaluation about the roughening process by hydrochloric acid failed.

In the comparative example 5, since Ti amount was less than a lower limit, uniformity evaluation became bad, and evaluation about the roughening process by hydrochloric acid failed.

In the comparative example 6, since Ti amount exceeded the upper limit, uniformity evaluation became bad, and evaluation about the roughening process by hydrochloric acid failed.

In Comparative Example 7, since the amount of Ni was less than the lower limit, the unetched portion evaluation and the uniformity evaluation were poor, and the evaluation on the roughening treatment by hydrochloric acid was failed.

In Comparative Example 8, since the amount of Ni exceeded the upper limit, the tensile strength after the sintering treatment became poor, and evaluation of the tensile strength failed. In addition, uniformity evaluation was poor, and evaluation of the roughening process by hydrochloric acid failed.

In Comparative Examples 9-11, since Mn amount, Mg amount, or Cu amount were less than a lower limit, the tensile strength as it is as a raw material of a board | substrate and after baking processing became poor, and evaluation of tensile strength failed.

Since the amount of Mn exceeded the upper limit in Comparative Example 12, and the amount of Mg exceeded the upper limit in Comparative Example 13, uniformity evaluation was also poor, and evaluation of the roughening treatment by hydrochloric acid failed.

On the other hand, since Examples 1-10 and Comparative Examples 1-13 manufactured the aluminum alloy plate by cold rolling which does not perform an intermediate annealing, as a result of visual observation, neither the wound of the board | plate material surface was confirmed. Moreover, since the aluminum alloy plate was manufactured by cold rolling which does not perform such intermediate annealing, manufacturing cost was reduced.

[2] Manufacturing conditions

Next, alloy 2 and alloy 5 were selected from the Example, these were melted and cast, and the ingot was manufactured. The produced ingot was chamfered to a thickness of 550 mm, the ingot was subjected to homogenization heat treatment for 4 hours at the temperature shown in Table 2, and hot rolling was started immediately after the homogenization heat treatment as it was at that temperature, and at the rolling end temperature shown in Table 2 Hot rolling was complete | finished and the rolled plate of thickness 3mm was produced. And the cold rolling which does not perform an intermediate annealing with respect to this rolled sheet was performed, and the aluminum alloy plate concerning Examples 11-17 and Comparative Examples 14-19 of thickness 0.3mm was manufactured. On the other hand, annealing was not performed before or after cold rolling.

For Examples 11 to 17 and Comparative Examples 14 to 19, the number density of Ni-containing intermetallic compounds having a maximum length of 1 to 10 µm was measured to evaluate the evaluation of tensile strength and the roughening treatment by hydrochloric acid. It was done as follows.

In Table 2, the measurement conditions of the manufacturing conditions of Examples 11-17 and Comparative Examples 14-19 and the number density of Ni containing intermetallic compound whose maximum length is 1-10 micrometers, the measurement result of tensile strength, and the roughening process by hydrochloric acid The evaluation result about is shown together. On the other hand, in Example 12, the composition and manufacturing conditions of the alloy are the same as in Example 2 described above.

In addition, the underline in Table 2 shows that it does not satisfy the requirements of the present invention.

As shown in Table 2, in Examples 11 to 17, since the composition of the aluminum alloy satisfies the requirements of the present invention and the manufacturing conditions were suitable, the evaluation of the tensile strength and the roughening treatment by hydrochloric acid were evaluated. (Ie, non-etching part evaluation and uniformity evaluation) were excellent.

In particular, in Examples 11, 12, and 17, unetched part evaluation and uniformity evaluation were very favorable.

On the other hand, in Comparative Examples 14 to 19, the production conditions did not satisfy the requirements of the present invention, and the evaluation (ie, non-etching part evaluation and / or uniformity evaluation) for the roughening treatment with hydrochloric acid was inferior. .

Specifically, in Comparative Example 14, the homogenization heat treatment temperature was less than the lower limit, and the rolling end temperature of hot rolling was less than the lower limit. Therefore, the non-etching part evaluation and the uniformity evaluation became poor, and the evaluation about the roughening process by hydrochloric acid failed.

In Comparative Example 15, since the homogenization heat treatment temperature exceeded the upper limit, uniformity evaluation became poor, and evaluation of the roughening treatment by hydrochloric acid failed.

In the comparative example 16, since the rolling finish temperature of hot rolling was less than a lower limit, uniformity evaluation became bad, and evaluation about the roughening process by hydrochloric acid failed.

In Comparative Example 17, the homogenization heat treatment temperature was less than the lower limit, and the rolling end temperature of hot rolling was less than the lower limit. Therefore, the non-etching part evaluation and the uniformity evaluation became poor, and the evaluation about the roughening process by hydrochloric acid failed.

In Comparative Example 18, the homogenization heat treatment temperature exceeded the upper limit, and the rolling end temperature of hot rolling exceeded the upper limit. Therefore, evaluation of uniformity became poor, and evaluation of the roughening process by hydrochloric acid failed.

In Comparative Example 19, since the rolling finish temperature of the hot rolling was lower than the lower limit, uniformity evaluation became poor, and evaluation of the roughening treatment by hydrochloric acid failed.

On the other hand, in Examples 11-17 and Comparative Examples 14-19, since the aluminum alloy plate was manufactured by cold rolling which does not perform intermediate annealing, as a result of visual observation, neither the wound of the board | plate material surface was confirmed. Moreover, since the aluminum alloy plate was manufactured by cold rolling which does not perform such intermediate annealing, manufacturing cost was reduced.

[3] About intermediate annealing

Next, in order to investigate the fragility of the surface of the aluminum alloy plate by intermediate annealing, the ingot was produced as mentioned above using alloy 2 and the alloy 5. The produced ingot is faced to a thickness of 550 mm, the ingot is subjected to a homogenization heat treatment at the temperature shown in Table 3, and immediately after the temperature, the hot rolling is finished at the rolling end temperature shown in Table 3, and the thickness of 3 mm is rolled. The plate was manufactured. Then, the rolled sheet was cold rolled to prepare an aluminum alloy sheet according to Examples 18 and 19 and Comparative Examples 20 and 21 having a thickness of 0.3 mm. On the other hand, in Comparative Examples 20 and 21, intermediate annealing was performed by a continuous annealing line corresponding to 450 ° C. × 0 second at a thickness of 2.0 mm.

In Examples 18 and 19 and Comparative Examples 20 and 21, visual observation evaluated whether or not the surface of the plate material had a wound having a level at which the printing performance was poor as a printing plate material. As a result of visual observation, the thing which did not have such a wound on the board surface was made into (circle) (good), and that such a wound appeared as x (defect).

In addition to the manufacturing conditions of Example 18, 19 and Comparative Examples 20, 21 in Table 3, the presence or absence of intermediate annealing and the wound evaluation of a board surface are shown. On the other hand, Examples 18 and 19 have the same composition and manufacturing conditions as those of Examples 2 and 5, respectively.

As shown in Table 3, since Examples 18 and 19 did not perform intermediate annealing, the board | plate material surface was not damaged.

On the other hand, since the comparative examples 20 and 21 performed intermediate annealing, either of them was wound on the surface of a board | plate material.

S1: casting process
S2: Homogenization Heat Treatment Process
S3: hot rolling process
S4: cold rolling process

Claims (2)

As an aluminum alloy plate for printing plates which is subjected to an electrolytic roughening treatment and used as a support of a printing plate,
Si: 0.03 to 0.15 mass%, Fe: 0.2 to 0.6 mass%, Ti: 0.005 to 0.05 mass%, Ni: 0.005 to 0.10 mass%
Mn: 0.005 to 0.05% by mass, Mg: 0.005 to 0.05% by mass and Cu: at least one selected from 0.005 to 0.05% by mass,
The balance has a composition composed of Al and unavoidable impurities, and
It is produced by cold rolling without performing intermediate annealing,
The number density of Ni-containing intermetallic compound whose maximum length is 1-10 micrometers among the intermetallic compounds which exist in a board surface is 200-4000 pieces / mm <^2> , The aluminum alloy plate for printing plates. As a manufacturing method for manufacturing the aluminum alloy plate for printing plates of Claim 1,
A casting step of casting an ingot of an aluminum alloy having the composition according to claim 1,
A homogenization heat treatment step of homogenizing heat treatment of the ingot at 380 to 550 ° C.,
A hot rolling step of producing a rolled plate by hot rolling the ingot subjected to the homogenization heat treatment to a rolling end temperature of 300 to 370 ° C .;
Cold rolling step of performing cold rolling without performing an intermediate annealing on the rolled plate
The manufacturing method of the aluminum alloy plate for printing plates characterized by including.

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