Search

CN-122012995-A - Aluminum foil and preparation method and application thereof

CN122012995ACN 122012995 ACN122012995 ACN 122012995ACN-122012995-A

Abstract

The application discloses an aluminum foil, a preparation method and application thereof, and relates to the technical field of aluminum alloy foil and processing thereof. The foil disclosed by the application comprises, by mass, 0.20% -0.65% of Si, 1.32% -1.60% of Fe, 0.12% -0.15% of Cu, 0.004% -0.005% of Mn, 0% -0.002% of Cr and other than 0%, 0% -0.01% of Zn and other than 0%, 0% -0.012% of Ga and other than 0%, 0% -0.018% of Ti and other than 0%, and the balance of Al and unavoidable impurities. The aluminum foil provided by the application has good mechanical properties, wettability and processability, and is suitable for being applied to the field of aseptic packaging.

Inventors

  • YANG CHUNXIU
  • WANG XIUBIN
  • ZHAO QIANG
  • ZHOU YULI
  • ZHANG SHUAI
  • LI ZHONGZHENG
  • ZHAO PIZHI
  • CHEN WEI
  • LIANG JIAN
  • CHEN YUNAN
  • MA LI
  • Jin Zhishuai
  • MA BAOBAO

Assignees

  • 中铝材料应用研究院有限公司
  • 中铝铝箔(陇西)有限公司

Dates

Publication Date
20260512
Application Date
20260408

Claims (10)

  1. 1. The aluminum foil is characterized by comprising, by mass, 0.20% -0.65% of Si, 1.32% -1.60% of Fe, 0.12% -0.15% of Cu, 0.004% -0.005% of Mn, 0% -0.002% of Cr and other than 0, 0% -0.01% of Zn and other than 0, 0% -0.012% of Ga and other than 0, 0% -0.018% of Ti and other than 0, and the balance of Al and unavoidable impurities.
  2. 2. The aluminum foil according to claim 1, wherein an average grain size of a rolling surface of the aluminum foil is <35 μm, a transverse tensile strength and a longitudinal tensile strength of the aluminum foil are each independently 80mpa to 100mpa, a transverse elongation at break and a longitudinal elongation at break of the aluminum foil are each independently 2% -5%, and wettability of the aluminum foil is class a or higher.
  3. 3. The aluminum foil according to claim 1 or 2, wherein the thickness of the aluminum foil is 5.5-7.0 μm.
  4. 4. A method of producing an aluminum foil according to any one of claims 1 to 3, comprising the steps of: s1, preparing an aluminum foil blank with the conductivity of 29.5-31.5% IACS; s2, carrying out aluminum foil rolling on the aluminum foil blank to obtain an intermediate product; s3, carrying out oil removal annealing on the intermediate product to obtain the aluminum foil; The oil removal annealing method comprises the steps of heating to T 1 ℃ at a speed V 1 ℃ per hour, preserving heat for T 1 hours, heating to T 2 ℃ at a speed V 2 ℃ per hour, preserving heat for T 2 hours, heating to T 3 ℃ at a speed V 3 ℃ per hour, preserving heat for T 3 hours, cooling to T 4 ℃ at a speed V 4 ℃ per hour, preserving heat for T 4 hours, cooling to 100 ℃ at a speed V 5 ℃ per hour, and discharging and air cooling, wherein V 1 is 5-10, T 1 is 80-120, T 1 is 10-15, V 2 is 1-10, T 2 is 120-150, T 2 is 10-15, V 3 is 4-10, T 3 is 180-300, T 3 is 20-45, T 3 is 5-10, T 3 is 120-150, and T 3 is 10-15 and V 3 is 1-5.
  5. 5. The method of manufacturing aluminum foil according to claim 4, wherein S1 comprises the steps of: S11, melting and refining all metal raw materials except Ti to obtain a first melt; S12, adding a Ti-containing raw material into the first melt to obtain a second melt, and casting and rolling the second melt to obtain an aluminum alloy cast-rolled plate; and S13, cold rolling the aluminum alloy cast-rolled plate to obtain the aluminum foil blank.
  6. 6. The method of producing aluminum foil according to claim 5, wherein at least one of the following conditions is satisfied: (1) In the step S13, the cold rolling comprises N-pass cold rolling, and intermediate annealing is carried out on a product obtained by the N-1 th pass cold rolling after the N-1 th pass cold rolling is finished, wherein N is an integer greater than 1, the temperature of the intermediate annealing is 200-370 ℃, the temperature rising rate of the intermediate annealing is 30-65 ℃ per hour, and the heat preservation time of the intermediate annealing is 1.5-6 hours; (2) The thickness of the aluminum alloy cast-rolled plate is 6 mm-8 mm.
  7. 7. The method of producing an aluminum foil according to any one of claims 4 to 6, wherein at least one of the following conditions is satisfied: (1) The state of the aluminum foil blank is H14 state; (2) The intermediate product is in an H18 state; (3) The thickness of the aluminum foil blank is 0.2 mm-0.3 mm; (4) The thickness of the intermediate product is 5.5-7.0 mu m.
  8. 8. The method according to any one of claims 4 to 6, wherein in S2, the aluminum foil rolling comprises M-pass rolling, and the product of the M-1-pass rolling is subjected to stress relief annealing after the M-1-pass rolling is finished, wherein M is an integer greater than 1, and the temperature of the stress relief annealing is equal to or less than 180 ℃.
  9. 9. The method of producing an aluminum foil according to any one of claims 4 to 6, wherein at least one of the following conditions is satisfied: (1) The temperature of T 3 is 210-240 ℃; (2) In the step S2, rolling is carried out after aluminum foil rolling is finished, so that an intermediate product is obtained, the weight of the intermediate product is 0.8 ton-1.6 ton, and the width of the intermediate product is 1300 mm-160 mm.
  10. 10. Use of the aluminium foil of any one of claims 1 to 3 or produced by the method of producing an aluminium foil of any one of claims 4 to 9 in the field of aseptic packaging.

Description

Aluminum foil and preparation method and application thereof Technical Field The application relates to the technical field of aluminum alloy foil and processing thereof, in particular to an aluminum foil and a preparation method and application thereof. Background The aseptic package is a mainstream package mode of modern dairy products and drinks, and is formed by compounding a plurality of layers of materials such as base paper, aluminum foil, polyethylene (PE) and the like. The aluminum foil is a core material of the aseptic package by virtue of the advantages of low density, moisture resistance, oxygen resistance, innocuity, light shielding, heat insulation and the like, namely, the aluminum foil takes over the oxygen resistance of more than 98 percent and the light shielding function of 100 percent although the weight of the aluminum foil in the composite structure is relatively low, and directly determines whether the quality guarantee period and the qualification rate of the terminal product can be realized for more than 6 months. The product specification of the sterile packaging aluminum foil is generally 6-7 mu m, the state is O state, and the finished aluminum foil has excellent mechanical property and wettability, so that the low needle hole rate and the low breakage rate are ensured. However, the existing aluminum foil has either good wettability but low tensile strength and elongation at break, or high tensile strength and elongation at break but poor wettability, so that the existing sterile packaging aluminum foil cannot fully meet the market demand. Disclosure of Invention The application mainly aims to provide an aluminum foil, a preparation method and application thereof, so as to solve the problem that the aluminum foil is difficult to have excellent mechanical property and wettability in the prior art. In order to achieve the above object, according to a first aspect of the present application, there is provided an aluminum foil comprising, by mass, 0.20% -0.65% of Si, 1.32% -1.60% of Fe, 0.12% -0.15% of Cu, 0.004% -0.005% of Mn, 0% -0.002% of Cr and other than 0, 0% -0.01% of Zn and other than 0, 0% -0.012% of Ga and other than 0, 0% -0.018% of Ti and other than 0, and the balance of Al and unavoidable impurities. Further, the average grain size of the rolling surface of the aluminum foil is less than 35 mu m, the transverse (TD, perpendicular to the rolling direction) tensile strength and the longitudinal (RD, rolling direction) tensile strength of the aluminum foil are respectively and independently 80-100 MPa, the transverse elongation at break and the longitudinal elongation at break of the aluminum foil are respectively and independently 2-5%, and the wettability of the aluminum foil is above grade A. Further, the thickness of the aluminum foil is 5.5 μm to 7.0 μm. According to another aspect of the present application, there is provided a method for preparing an aluminum foil, comprising the steps of: s1, preparing an aluminum foil blank with the conductivity of 29.5-31.5% IACS; S2, aluminum foil rolling is carried out on the aluminum foil blank, and an intermediate product is obtained; s3, carrying out oil removal annealing on the intermediate product to obtain an aluminum foil; The oil removal annealing method comprises the steps of heating to T 1 ℃ at a rate V 1 ℃ per hour, preserving heat for T 1 hours, heating to T 2 ℃ at a rate V 2 ℃ per hour, preserving heat for T 2 hours, heating to T 3 ℃ at a rate V 3 ℃ per hour, preserving heat for T 3 hours, cooling to T 4 ℃ at a rate V 4 ℃ per hour, preserving heat for T 4 hours, and finally cooling to 100 ℃ at a rate V 5 ℃ per hour, and discharging and air cooling, wherein V 1 is 5-10, T 1 is 80-120, T 1 is 10-15, V 2 is 1-10, T 2 is 120-150, T 2 is 10-15, V 3 is 4-10, T 3 is 180-300, T 3 is 20-45, T 4 is 5-10, T 4 is 120-150, and T 4 is 1-15, and V 5 is 1-5. T 3 is preferably 210 to 240. Further, S1 includes the following steps: S11, melting and refining all metal raw materials except Ti to obtain a first melt; s12, adding a Ti-containing raw material into the first melt to obtain a second melt, and casting and rolling the second melt to obtain an aluminum alloy cast-rolled plate; S13, cold rolling the aluminum alloy cast-rolled plate to obtain an aluminum foil blank. Further, in S13, the cold rolling comprises N-pass cold rolling, and after the N-1-pass cold rolling is finished, intermediate annealing is carried out on a product obtained by the N-1-pass cold rolling, wherein N is an integer greater than 1, the temperature of the intermediate annealing is 200-370 ℃, the temperature rising rate of the intermediate annealing is 30-65 ℃ per hour, and the heat preservation time of the intermediate annealing is 1.5-6 hours. Further, the thickness of the aluminum alloy cast-rolled plate is 6 mm-8 mm. Further, the state of the aluminum foil blank is H14 state. Further, the intermediate product is in the H18 state. Further, the thickness