Aluminum alloy plate strip for treatment-free printing plate base and method of preparing the same

Abstract

To provide an aluminum alloy plate strip capable of fitting the tensile strength to the matte finish performance of the aluminum alloy plate strip for a treatment-free printing plate base, and a method of preparing the same.SOLUTION: An aluminum alloy plate strip comprises the following components in percentage by mass: the content of Si is 0.02 to 0.10%, the content of Fe is 0.10 to 0.35%, the content of Cu is less than 0.05%, the content of Mn is less than 0.02%, the content of Mg is 0.17% to 0.35%, the content of Zn is less than 0.02%, the content of Ti is less than 0.03%, and the balance is Al and a plurality of inevitable impurities. The total content of the impurities is less than 0.15%. The content of a single impurity is less than 0.05%. The aluminum alloy plate strip for the treatment-free printing plate base, which contains the above elements, has high softening deformation resistance, high resolution and printing resistance, so that the aluminum alloy plate strip can fit the tensile strength to the matte finish performance.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum alloy casting, and more specifically, to an aluminum alloy plate belt material for a processing-free printing plate base and a manufacturing method thereof.

Background Art

[0002] Due to its performance characteristics such as high strength, good surface treatability, and good hydrophilicity, aluminum materials are used in the manufacture of printing plate bases, giving the printing plate bases the advantages of good stability, high resolution, and strong printing resistance. The printing mechanism is to surface-treat an aluminum plate and then apply a layer of photosensitive resin to manufacture a printing plate base, and complete the printing by relying on the characteristics of the ink affinity of the photosensitive resin layer and the hydrophilicity of the aluminum base of the grained layer. Compared with ordinary CTP plates and PS plates, the processing-free printing plate base has a multi-layer grained surface morphology, high resolution, is environmentally friendly, and has a very large development space.

[0003]

Summary of the Invention

[0004] The main object of the present invention is to provide an aluminum alloy plate belt material for a processing-free printing plate base and a manufacturing method thereof in order to solve the problem that it is difficult to match the tensile strength and grained performance of the aluminum material for the processing-free printing plate base in the prior art.

[0005] In order to achieve the above object, according to a first aspect of the present invention, an aluminum alloy sheet belt material for a non - processing printing plate base is provided. In terms of mass percentage, the aluminum alloy sheet belt material contains Si with a content of 0.02% - 0.10%, Fe with a content of 0.10% - 0.35%, Cu with a content of <0.05%, Mn with a content of <0.02%, Mg with a content of 0.17% - 0.35%, Zn with a content of <0.02%, and Ti with a content of <0.03%. The balance is Al and several kinds of inevitable impurities. The total content of the impurities is <0.15%, and the content of a single impurity is <0.05%. However, the tensile strength of the aluminum alloy sheet belt material is 170 - 210 MPa, the electrolytic surface roughness Ra of the aluminum alloy sheet belt material is 0.45 - 0.55 μm, Rz is 3.50 - 4.60 μm, the electrode potential of the aluminum alloy sheet belt material is -0.7V - -0.9V, and the number density of the Fe - containing second phase exceeding 5 μm in length in the aluminum alloy sheet belt material is ≦10 pieces / mm 2 and the area ratio occupied by the deformed crystal grains in the aluminum alloy sheet belt material is ≧90%.

[0006] Furthermore, the roughness Ra of the above - mentioned aluminum alloy sheet belt material is 0.2 - 0.3 μm, and Rz is 1.5 - 2.5 μm.

[0007] Furthermore, after anodic oxidation, the diameter of the pit defects on the anodic oxidation surface of the above - mentioned aluminum alloy sheet belt material is <0.2 mm, and / or the color difference ΔE of the anodic oxidation surface of the aluminum alloy sheet belt material is <0.25, and / or the luminance difference ΔL of the anodic oxidation surface of the aluminum alloy sheet belt material is <0.25.

[0008] Furthermore, the yield strength of the above - mentioned aluminum alloy sheet belt material is ≧160 MPa, and / or the elongation rate of the aluminum alloy sheet belt material is ≧1%, preferably ≧4%.

[0009] According to another aspect of the present invention, there is provided a method for manufacturing the aluminum alloy sheet belt material, the manufacturing method including the steps of casting, heat treatment, hot rolling, primary cold rolling, intermediate annealing, and secondary cold rolling, which are sequentially performed. However, the temperature of the intermediate annealing step is 420 to 440 °C, and the cooling water temperature of the casting step is 19 to 25 °C.

[0010] Furthermore, in the above intermediate annealing step, the heating rate is 20 to 30 °C / hour, and the holding time is 2 to 4 hours.

[0011] Furthermore, the standing time after the casting step is 30 to 50 minutes, and / or the temperature of the heat treatment step is 440 to 480 °C.

[0012] Furthermore, the rolling start temperature of the hot rolling step is 420 to 460 °C, and / or the final rolling temperature is 270 to 310 °C.

[0013] Furthermore, the rolling speed in the primary cold rolling step is 300 to 1000 m / minute.

[0014] Furthermore, the surface roughness of the rolling roller in the secondary cold rolling step is 0.3 to 0.4 μm, and / or the cold rolling rate in the secondary cold rolling step is 80 to 90%.

[0015] By applying the technical solution of the present invention, the present invention controls the content of each element within the above range, thereby improving the synergistic effect of each element. Compared with the prior art, in the present application, by reducing the content of Cu, Si, and Fe elements and increasing the content of Mg element, the produced aluminum alloy plate belt material for a processing-free printing plate base has the above tensile strength, electrolytic graining roughness, electrode potential, and surface quality (specifically, by controlling the number density and size of the Fe-containing second phase in the present application within the above range, it contributes to reducing the degree of streak defects on the surface of the aluminum alloy plate belt material. The above low electrode potential helps to form a multi-layer grained morphology on the surface of the aluminum alloy plate belt material after electrolytic treatment), and further, thereby, making the aluminum alloy plate belt material for a processing-free printing plate base have high anti-softening deformation ability, high resolution, and printing resistance, so as to solve the problem that it is difficult to match the tensile strength and graining performance of the aluminum alloy plate belt material for a processing-free printing plate base.

Brief Description of the Drawings

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to interpret the present invention and do not constitute an undue limitation to the present invention. The drawings are as follows.

[0017]

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Embodiments for Carrying Out the Invention

[0018] In the case where there is no conflict, the examples and features in the examples in the present application can be combined with each other. Hereinafter, the present invention will be described in detail with reference to the drawings and in combination with the examples.

[0019] As analyzed in the background art of the present application, in the prior art, there is a problem that it is difficult to match the tensile strength and graining performance of an aluminum material for a process-free printing plate base. To solve the above problem, the present invention provides an aluminum alloy plate belt material for a process-free printing plate base and a manufacturing method thereof.

[0020] In one typical embodiment of the present application, an aluminum alloy plate belt material for a non-treatment printing plate base is provided. By mass percentage, the aluminum alloy plate belt material contains Si with a content of 0.02% to 0.10%, Fe with a content of 0.10% to 0.35%, Cu with a content of <0.05%, Mn with a content of <0.02%, Mg with a content of 0.17% to 0.35%, Zn with a content of <0.02%, and Ti with a content of <0.03%. The balance is Al and several types of inevitable impurities, and the total content of the impurities is <0.15%, and the content of a single impurity is <0.05%. However, the tensile strength of the aluminum alloy plate belt material is 170 to 210 MPa, the electrolytic surface roughness Ra of the aluminum alloy plate belt material is 0.45 to 0.55 μm, Rz is 3.50 to 4.60 μm, the electrode potential of the aluminum alloy plate belt material is -0.7V to -0.9V, and the number density of Fe-containing second phases exceeding 5 μm in length in the aluminum alloy plate belt material is ≦10 pieces / mm 2 and the area ratio occupied by the deformed crystal grains in the aluminum alloy plate belt material is ≧90%.

[0021] The present invention controls the content of each element within the above range to improve the synergistic effect of each element. Compared with the prior art, in the present application, by reducing the content of Cu, Si, and Fe elements and increasing the content of Mg element, the manufactured aluminum alloy plate belt material for a non-treatment printing plate base has the above tensile strength, electrolytic surface roughness, electrode potential, and surface quality (specifically, by controlling the number density and size of the Fe-containing second phase in the present application within the above range, it contributes to reducing the degree of streak defects on the surface of the aluminum alloy plate belt material. The above low electrode potential helps to form a multi-layer surface roughness morphology on the surface of the aluminum alloy plate belt material after electrolytic treatment), and further, thereby, the aluminum alloy plate belt material for a non-treatment printing plate base has a high anti-softening deformation ability, high resolution, and printing resistance, thus solving the problem that it is difficult to match the tensile strength and surface roughness performance of the aluminum alloy plate belt material for a non-treatment printing plate base.

[0022] In one embodiment of the present application, the roughness Ra of the aluminum alloy plate belt material is 0.2 to 0.3 μm, and the Rz is 1.5 to 2.5 μm.

[0023] Preferably, by controlling the roughness of the aluminum alloy plate belt material within the above range, it helps to improve the printing resolution of the aluminum alloy plate belt material itself. Therefore, even after the graining treatment of the aluminum alloy plate belt material, it still has excellent resolution and meets the technical indicators and application requirements of the aluminum alloy plate belt material for the processing-free printing plate base.

[0024] In one embodiment of the present application, in order to improve the printing resistance of the aluminum alloy plate belt material, after anodization, the diameter of the pit defects on the anodized surface of the aluminum alloy plate belt material is <0.2 mm, and / or the color difference ΔE of the anodized surface of the aluminum alloy plate belt material is <0.25, and / or the luminance difference ΔL of the anodized surface of the aluminum alloy plate belt material is <0.25.

[0025] One of the surface defects of the processing-free printing plate base is pit defects. Pit defects have the characteristics of small size, random distribution, and being difficult to identify. They usually have little impact on the quality of the ordinary printing plate base, but have a great impact on the quality of the high-resolution processing-free printing plate base. Researchers speculate that during the electrolytic graining and anodization processes, since Al3Fe has a higher electrode potential than the aluminum matrix, preferential corrosion occurs on the aluminum matrix around it, thereby eroding the aluminum alloy plate belt material. When the electrolytic graining and anodization reactions proceed, the surface Al3Fe dissolves or falls off, and pit defects are formed on the surface of the processing-free printing plate base. The present application reduces the electrode potential of the aluminum alloy plate belt material so that the diameter of the pit defects on the anodized surface of the aluminum alloy plate belt material of the present application is within the above range. Therefore, the degree of pit defects on the anodized surface of the aluminum alloy plate belt material is reduced. Preferably, when the color difference ΔE and the luminance difference ΔL are within the above range, it is advantageous to further improve the quality of the anodized surface of the aluminum alloy plate belt material.

[0026] In the present application, a confocal microscope is used to detect the three-dimensional topography of pit defects.

[0027] In one embodiment of the present application, the yield strength of the aluminum alloy plate belt material is ≧160 MPa, and / or the elongation rate of the aluminum alloy plate belt material is ≧1%, preferably ≧4%.

[0028] Preferably, by controlling the yield strength and elongation rate of the aluminum alloy plate belt material within the above ranges, it is advantageous to improve the anti-softening deformation ability of the aluminum alloy plate belt material.

[0029] In another typical embodiment of the present application, a manufacturing method of the aluminum alloy plate belt material is provided. The manufacturing method includes the steps of casting, heat treatment, hot rolling, primary cold rolling, intermediate annealing, and secondary cold rolling, which are performed sequentially. However, the temperature of the intermediate annealing step is 420 - 440°C, and the cooling water temperature of the casting step is 19 - 25°C.

[0030] An aluminum alloy liquid containing Si, Fe, Cu, Mn, Mg, Zn, and Ti elements is formed by smelting, and this aluminum alloy liquid is cast to form an aluminum alloy. One of the surface defects of the processing-free printed circuit board base is streak defects. Streak defects mainly appear in the central region of the aluminum alloy plate belt material, showing a strip-shaped distribution along the rolling direction, with a large number and large area (width 1 - 5 mm, length 10 - 100 m), seriously affecting the printing quality. By comparing and studying the metal microstructure characteristics of the normal region and the defect region, the researchers found that the size of the Fe-containing phase in the streak defect region is large (about 10 μm), and the larger the size of the Fe-containing second phase, the larger the pit defects, and the more the number of Fe-containing second phases, the more the pit defects. The reason is that in the casting process of the aluminum alloy, due to non-uniform cooling, the high-melting-point Fe-containing phase segregates to form a segregation distribution along the rolling direction. This application controls the temperature of the cooling water during casting within the above range, which helps to refine the Fe-containing phase crystal particles and improve the uniformity of the distribution of the Fe-containing phase crystal particles. Therefore, the number density of the Fe-containing second phase with a length exceeding 5 μm in the aluminum alloy plate belt material is ≦ 10 pieces / mm 2 and further improves the surface quality of the aluminum alloy plate belt material. Heat treatment of the aluminum alloy contributes to making the internal structure of the aluminum alloy belt material more uniform, thereby improving the strength and plasticity of the aluminum alloy plate belt material. Hot rolling the heat-treated aluminum alloy contributes to further improving the strength and plasticity of the aluminum alloy plate belt material. Performing primary cold rolling on the aluminum alloy after hot rolling is beneficial for improving the surface smoothness and flatness of the aluminum alloy plate belt material. Intermediate annealing is performed on the aluminum alloy after primary cold rolling. Preferably, by controlling the temperature of the intermediate annealing within the above range, it helps to refine the size of the crystal particles, randomize the orientation, improve the dispersion uniformity of the crystal particles, and promote the solid solution of the Mg-Si phase. Therefore, it is beneficial for the formation of a multi-layered matte morphology on the surface of the aluminum alloy plate belt material after electrolytic corrosion. Secondary cold rolling is performed on the annealed aluminum alloy to form the aluminum alloy plate belt material, and finally, an aluminum alloy plate belt material with excellent comprehensive properties is obtained.

[0031] In addition, the above intermediate annealing process further reveals the influence relationship between the crystal grain size and Mg-Si on the surface texture of the aluminum alloy plate belt material for the printing plate base that does not require treatment.

[0032] Preferably, the casting of the present application is divided into two steps: melting and semi-continuous casting.

[0033] In order to further refine the crystal grain size, in one embodiment of the present application, preferably, in the above intermediate annealing process, the heating rate is 20 to 30 °C / hour, and the holding time is 2 to 4 hours.

[0034] In order to further improve the uniformity of the internal structure of the aluminum alloy plate belt material, in one embodiment of the present application, preferably, the standing time after the above casting process is 30 to 50 minutes, and / or the temperature of the heat treatment process is 440 to 480 °C.

[0035] In one embodiment of the present application, the rolling start temperature of the above hot rolling process is 420 to 460 °C, and / or the final rolling temperature is 270 to 310 °C.

[0036] If the hot rolling temperature is too high or too low, it is disadvantageous for improving the strength and plasticity of the aluminum alloy plate belt material. Preferably, controlling the rolling start temperature and the final rolling temperature of the hot rolling within the above range contributes to improving the anti-softening deformation ability of the aluminum alloy plate belt material.

[0037] In one embodiment of the present application, the rolling speed in the above first cold rolling process is 300 to 1000 m / min.

[0038] If the rolling speed is too fast, it is disadvantageous for the formation of regular crystal grains. If the rolling speed is too slow, it is disadvantageous for the refinement of crystal grains. Therefore, preferably, controlling the rolling speed of the first cold rolling within the above range contributes to improving the strength of the aluminum alloy plate belt material.

[0039] In order to improve the thickness uniformity of the aluminum alloy sheet belt material and reasonably control the surface roughness of the aluminum alloy sheet belt material, in one embodiment of the present application, preferably, the surface roughness of the rolling roller in the above secondary cold rolling process is 0.3 to 0.4 μm, and / or the cold rolling rate in the secondary cold rolling process is 80 to 90%, thus helping to improve the effect of secondary cold rolling.

[0040] Hereinafter, with reference to the embodiments, the beneficial effects of the present application will be further described.

[0041] (Example 1) The components of the aluminum alloy sheet belt material for the treatment-free printing plate base are, by mass percentage, the Si content is 0.03%, the Fe content is 0.31%, the Cu content is 0.01%, the Mn content is 0.01%, the Mg content is 0.19%, the Zn content is 0.01%, the Ti content is 0.01%, the balance is Al and several types of inevitable impurities, and each of the various impurities is less than 0.05%, and the total impurity content is less than 0.15%.

[0042] Its manufacturing method includes the following steps.

[0043] In the casting step of S1, an aluminum alloy flat ingot is manufactured using melting and the semi-continuous casting method. The melting standing time is 30 minutes, and the cooling water temperature for semi-continuous casting is 22°C. In the heating step of S2, the heating temperature of the aluminum alloy ingot is 440°C. In the hot rolling step of S3, the rolling start temperature is 420°C, and the final rolling temperature is 270°C. In the first cold rolling step of S4, the rolling speed is 1000 m / minute. In the intermediate annealing step of S5, the annealing temperature is 420°C, the heating rate is 20°C / hour, and the holding time is 2 hours. In the secondary cold rolling step of S6, the cold rolling rate is 80%, the surface roughness of the rolling roller is 0.3 μm, and the thickness of the rolled aluminum alloy sheet belt material is 0.23 mm.

[0044] The area ratio occupied by the deformed crystal grains of the manufactured aluminum alloy sheet belt material is 94%, and the number density of the Fe-containing second phase with a length exceeding 5 μm is 10 grains / mm 2 and the maximum diameter of the pits on the anodized surface is 0.12 mm. For the aluminum alloy sheet belt material used for the printing plate base that does not require such treatment, the precipitation and redissolution diagrams of the Mg2Si phase before and after intermediate annealing are shown in Fig. 1, the distribution diagram of the Fe-containing second phase is shown in Fig. 2, the area ratio diagram of the deformed crystal grains is shown in Fig. 3, the distribution diagram of the surface roughness before and after graining treatment is shown in Fig. 4, and the three-dimensional topography of the surface after anodization is shown in Fig. 5.

[0045] (Example 2) The differences from Example 1 are as follows. The alloy composition of the aluminum alloy sheet belt material has a Si content of 0.08%, an Fe content of 0.25%, a Cu content of 0.01%, an Mn content of 0.01%, a Mg content of 0.26%, a Zn content of 0.01%, and a Ti content of 0.01%. Finally, an aluminum alloy sheet belt material is obtained. The area ratio occupied by the deformed crystal grains of the manufactured aluminum alloy sheet belt material is 91%, and the number density of the Fe-containing second phase with a length exceeding 5 μm is 4 grains / mm 2 and the maximum diameter of the pits on the anodized surface is 0.07 mm.

[0046] (Example 3) The differences from Example 1 are as follows. The alloy composition of the aluminum alloy sheet belt material has a Si content of 0.08%, an Fe content of 0.12%, a Cu content of 0.01%, an Mn content of 0.01%, a Mg content of 0.32%, a Zn content of 0.01%, and a Ti content of 0.01%. Finally, an aluminum alloy sheet belt material is obtained. The area ratio occupied by the deformed crystal grains of the manufactured aluminum alloy sheet belt material is 95%, and the number density of the Fe-containing second phase with a length exceeding 5 μm is 1 grain / mm 2 and the maximum diameter of the pits on the anodized surface is 0.06 mm.

[0047] (Example 4) The differences from Example 1 are as follows. The heating rate during intermediate annealing is 30 °C / hour. Finally, an aluminum alloy plate belt material is obtained, and the number density of Fe-containing second phases with a length exceeding 5 μm in the aluminum alloy plate belt material is 1 piece / mm 2 and the proportion of deformed crystal grains in the aluminum alloy plate belt material is 96%, and the diameter of pit defects on the anodized surface of the aluminum alloy plate belt material is 0.05 mm.

[0048] (Example 5) The differences from Example 1 are as follows. The heat treatment temperature is 480 °C. Finally, an aluminum alloy plate belt material is obtained, and the number density of Fe-containing second phases with a length exceeding 5 μm in the aluminum alloy plate belt material is 2 pieces / mm 2 and the proportion of deformed crystal grains in the aluminum alloy plate belt material is 92%, and the diameter of pit defects on the anodized surface of the aluminum alloy plate belt material is 0.09 mm.

[0049] (Example 6) The differences from Example 1 are as follows. The rolling start temperature in the hot rolling process is 460 °C, and the final rolling temperature is 310 °C. Finally, an aluminum alloy plate belt material is obtained, and the number density of Fe-containing second phases with a length exceeding 5 μm in the aluminum alloy plate belt material is 2 pieces / mm 2 and the proportion of deformed crystal grains in the aluminum alloy plate belt material is 91%, and the diameter of pit defects on the anodized surface of the aluminum alloy plate belt material is 0.11 mm.

[0050] (Example 7) The differences from Example 1 are as follows. The rolling speed in the first cold rolling process is 300 m / minute. Finally, an aluminum alloy plate belt material is obtained, and the number density of Fe-containing second phases with a length exceeding 5 μm in the aluminum alloy plate belt material is 3 pieces / mm 2 and the proportion of deformed crystal grains in the aluminum alloy plate belt material is 91%, and the diameter of pit defects on the anodized surface of the aluminum alloy plate belt material is 0.14 mm.

[0051] (Example 8) The differences from Example 1 are as follows. The surface roughness of the rolling roller in the secondary cold rolling process is 0.4 μm. Finally, an aluminum alloy plate belt material is obtained, and the number density of the Fe-containing second phase with a length exceeding 5 μm in the aluminum alloy plate belt material is 1 piece / mm 2 and the proportion of deformed crystal grains in the aluminum alloy plate belt material is 93%, and the diameter of the pit defects on the anodized surface of the aluminum alloy plate belt material is 0.12 mm.

[0052] (Example 9) The differences from Example 1 are as follows. The cold rolling rate in the secondary cold rolling process is 90%. Finally, an aluminum alloy plate belt material is obtained, and the number density of the Fe-containing second phase with a length exceeding 5 μm in the aluminum alloy plate belt material is 7 pieces / mm 2 and the proportion of deformed crystal grains in the aluminum alloy plate belt material is 98% by weight, and the diameter of the pit defects on the anodized surface of the aluminum alloy plate belt material is 0.13 mm.

[0053] (Comparative Example 1) The difference from Example 1 is that intermediate annealing is not performed in the manufacturing process. The area ratio of the deformed crystal grains in the manufactured aluminum alloy plate belt material is 81%, and the number density of the Fe-containing second phase with a length exceeding 5 μm in the aluminum alloy plate belt material is 6 pieces / mm 2 and the diameter of the pit defects on the anodized surface of the aluminum alloy plate belt material is 0.41 mm. The diagram of the area ratio of the deformed crystal grains in the aluminum alloy plate belt material for the treatment-free printing plate base (the light color represents the deformed crystal grains and the dark color represents the recrystallized grains) is shown in Fig. 6, and the distribution diagram of the surface roughness before and after graining of the aluminum alloy plate belt material for the treatment-free printing plate base is shown in Fig. 7.

[0054] (Comparative Example 2) The difference from Example 1 is that the temperature of the semi - continuous casting cooling water is 28°C ± 3°C in the manufacturing process. The number density of Fe - containing second - phase particles with a length exceeding 5 μm in the produced aluminum alloy sheet belt material is 20 particles / mm 2 and the proportion of deformed crystal particles in the aluminum alloy sheet belt material is 88%. The diameter of the pit defects on the anodized surface is 0.52 mm. The distribution diagram of the Fe - containing second - phase and its partial enlarged view of the aluminum alloy sheet belt material for the treatment - free printing plate base are shown in Fig. 8, and the three - dimensional topography diagram of the surface of the aluminum alloy sheet belt material for the treatment - free printing plate base after anodization is shown in Fig. 9.

[0055] (Comparative Example 3) The difference from Example 1 is as follows. By mass percentage, its components are: the Si content is 0.08%, the Fe content is 0.37%, the Cu content is 0.05%, the Mn content is 0.01%, the Mg content is 0%, the Zn content is 0.01%, and the Ti content is 0.01%. Finally, an aluminum alloy sheet belt material is obtained, and the number density of Fe - containing second - phase particles with a length exceeding 5 μm in the aluminum alloy sheet belt material is 15 particles / mm 2 and the proportion of deformed crystal particles in the aluminum alloy sheet belt material is 86%. The diameter of the pit defects on the anodized surface of the aluminum alloy sheet belt material is 0.34 mm.

[0056] (Comparative Example 4) The difference from Example 1 is as follows. The Si content is 0.15%, the Fe content is 0.4%, the Cu content is 0.1%, and the Mg content is 0.1%. Finally, an aluminum alloy sheet belt material is obtained, and the number density of Fe - containing second - phase particles with a length exceeding 5 μm in the aluminum alloy sheet belt material is 27 particles / mm 2 and the proportion of deformed crystal particles in the aluminum alloy sheet belt material is 79%. The diameter of the pit defects on the anodized surface of the aluminum alloy sheet belt material is 55 mm.

[0057] Regarding the aluminum alloy sheet belt materials manufactured in the above examples and comparative examples, the tensile strength, yield strength, elongation rate, electrode potential, roughness, electrolytic graining roughness, color difference ΔE, and luminance difference ΔL were tested, and the results are shown in Table 1.

[0058]

Table 1

[0059] From the above description, it can be seen that the above examples of the present invention achieve the following technical effects.

[0060] In the present invention, by controlling the content of each element within the above range, the synergistic effect of each element is improved. Compared with the prior art, in the present application, the content of Cu, Si, and Fe elements is reduced, and the content of Mg element is increased. As a result, the aluminum alloy sheet belt material for a processing-free printing plate base manufactured has the above tensile strength, electrolytic graining roughness, electrode potential, and surface quality (specifically, by controlling the number density and size of the Fe-containing second phase in the present application within the above range, it contributes to reducing the degree of streak defects on the surface of the aluminum alloy sheet belt material. The above low electrode potential helps to form a multi-layer grained morphology on the surface of the aluminum alloy sheet belt material after electrolytic treatment). Furthermore, thereby, the aluminum alloy sheet belt material for a processing-free printing plate base has high anti-softening deformation ability, high resolution, and printing resistance, so as to solve the problem that it is difficult to match the tensile strength and graining performance of the aluminum alloy sheet belt material for a processing-free printing plate base.

[0061] The above description is only an example of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can be modified and changed in various ways. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle scope of the present invention should all be included in the protection scope of the present invention.

Claims

1. An aluminum alloy plate belt material for a process-free printing plate base, comprising, in mass percentage, 0.02%-0.10% Si, 0.10%-0.35% Fe, <0.05% Cu, <0.02% Mn, 0.17%-0.35% Mg, <0.02% Zn, and <0.03% Ti, with the balance being Al and some kinds of unavoidable impurities, the total content of impurities being <0.15%, and the content of any single impurity being <0.05%; However, the tensile strength of the aluminum alloy plate belt material is 170 MPa to 210 MPa, The aluminum alloy belt material has an electrolytic grain roughness Ra of 0.45 μm to 0.55 μm and an Rz of 3.50 μm to 4.60 μm; The electrode potential of the aluminum alloy plate belt material is −0.7 V to −0.9 V, The aluminum alloy belt material has a number density of Fe-containing second phases having a length exceeding 5 μm of ≦10 pieces / mm ２ and an area ratio of the deformed crystal grains in the aluminum alloy plate belt material is ≧90%.

2. 2. The aluminum alloy plate belt material according to claim 1, wherein the aluminum alloy plate belt material has a roughness Ra of 0.2 μm to 0.3 μm and a roughness Rz of 1.5 μm to 2.5 μm.

3. 3. The aluminum alloy plate belt material according to claim 1, wherein after anodization, the diameter of pit defects on the anodized surface of the aluminum alloy plate belt material is <0.2 mm, and / or the color difference ΔE of the anodized surface of the aluminum alloy plate belt material is <0.25, and / or the brightness difference ΔL of the anodized surface of the aluminum alloy plate belt material is <0.

25.

4. 3. The aluminum alloy plate belt material according to claim 1 or 2, characterized in that the aluminum alloy plate belt material has a yield strength of ≧160 MPa and / or an elongation of ≧1%, preferably ≧4%.

5. The manufacturing method includes the steps of sequentially performing casting, heat treatment, hot rolling, first cold rolling, intermediate annealing, and second cold rolling, 3. The method for producing an aluminum alloy plate belt material according to claim 1, wherein the temperature in the intermediate annealing step is 420°C to 440°C, and the temperature of cooling water in the casting step is 19°C to 25°C.

6. The method according to claim 5, wherein in the intermediate annealing step, the temperature increase rate is 20° C. / hour to 30° C. / hour, and the temperature retention time is 2 hours to 4 hours.

7. The method according to claim 5, characterized in that the standing time after the casting step is 30 minutes to 50 minutes, and / or the temperature of the heat treatment step is 440°C to 480°C.

8. The method according to claim 5, wherein the starting rolling temperature in the hot rolling step is 420°C to 460°C, and / or the final rolling temperature is 270°C to 310°C.

9. The method according to claim 5, wherein the rolling speed in the first cold rolling step is 300 m / min to 1000 m / min.

10. The manufacturing method according to claim 5, characterized in that the surface roughness of the rolling roller in the secondary cold rolling step is 0.3 μm to 0.4 μm, and / or the cold rolling ratio in the secondary cold rolling step is 80% to 90%.

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