An aluminum foil for a 0.05 mm specification light string label and a method of manufacturing the same

Abstract

The present application relates to a kind of 0.05mm specification lamp strip label aluminum foil and its preparation method, it relates to aluminum foil material processing field, the present application uses 8011-H14 aluminum alloy as blank, by optimized rolling process and heat treatment process preparation super-soft high-strength performance aluminum foil.Specifically includes: blank selection-rough rolling-coil-precision rolling-dicing-gradient annealing, the present application significantly improves the flexibility and tensile strength of aluminum foil by optimizing element ratio and preparation process;By gradient annealing process effectively improves the mechanical properties and surface quality of aluminum foil;The thickness of the obtained aluminum foil product is uniform, the surface finish is high, suitable for high-precision etching and repeated bending electronic label application;And dynamic bending life is long, meet the long-term use demand of lamp strip label.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of aluminum foil material processing, in particular to a 0.05mm-specification aluminum foil for lamp strip labels and a preparation method thereof. BACKGROUND

[0002] In the field of electronic labels, the thickness of the aluminum foil for lamp strip labels needs to be strictly controlled at 0.05mm±1.5% to ensure that the etched lines are clear and the line width is not less than 0.05mm; at the same time, it also needs to have good flexibility and be able to withstand repeated bending; in addition, the electrical conductivity and corrosion resistance are also crucial, and the material needs to ensure stable transmission of circuit signals.

[0003] In the prior art, 1235, 1060 and other pure aluminum alloys are generally selected as materials for lamp strip labels, but pure aluminum alloys have low strength and are prone to edge cracking during rolling, which is difficult to meet the requirements of high-precision rolling. SUMMARY

[0004] In view of the above technical problems, the present application provides a 0.05mm-specification aluminum foil for lamp strip labels and a preparation method thereof.

[0005] In order to achieve the above purpose, the technical scheme of the present application is as follows:

[0006] A 0.05mm-specification aluminum foil for lamp strip labels and a preparation method thereof, the raw material is composed of the following weight percentage of elements: Si: 0.4-0.6%, Fe: 0.5-0.7%, Cu: 0.08%-0.10%, Mn: 0.03%-0.05%, total amount of other unavoidable impurities ≤0.15%, and the balance is Al, the preparation method comprises the following steps:

[0007] S1, material preparation:

[0008] Prepare the material according to the raw material ratio as the rolling blank, the blank thickness is 0.24mm and the width is 1000mm;

[0009] S2, rolling:

[0010] S2.1 rough rolling: the blank with a thickness of 0.24mm is rolled to a thickness of 0.128mm×1000mm in one pass, the rolling speed is 700-800m / min, and the rolling force is controlled at 1400-1700kN;

[0011] S2.2 coiling: two 0.128mm×1000mm thick aluminum foils are coiled by high-purity 80# base rolling oil, and then cut to 2×0.128mm×980mm composite material coils after coiling;

[0012] S2.3 Finishing: the composite material roll is rolled to 2x0.05mmx980mm at a rolling speed of 750-1050m / min, and the last pass reduction rate is 18%;

[0013] S3, slitting:

[0014] The rolled aluminum foil is slitted;

[0015] S4, the final product is obtained after heat treatment, and the heat treatment method adopts gradient annealing process, including:

[0016] S4.1, the temperature is raised from 100℃ to 260℃ at a rate of 25℃ / h, and the temperature is kept for 4 hours;

[0017] S4.2, keep the temperature at 260℃ for 25 hours;

[0018] S4.3, the temperature is lowered from 260℃ to 240℃ at a rate of 1.5℃ / h, and the temperature is kept for 13 hours;

[0019] S4.4, natural cooling to 80℃.

[0020] Further, in the rough rolling process of step S2.1, the roughness of the work roll is 0.295-0.305μm, the crown is 0.039-0.041mm, the rolling oil temperature is controlled at 35±2℃, and the flow rate is 1200L / min.

[0021] Further, in the finishing process of step S2.3, the roughness of the work roll is 0.248-0.252μm, the crown is 0.041-0.043mm, and the roll surface temperature is ≤45℃.

[0022] Further, in step S2.2, the transmittance of high-purity 80# base rolling oil is 91%-92%, the kinematic viscosity at 40℃ is 1.5-1.7mm² / s, and the acid value is ≤0.0035mgKOH / g.

[0023] Further, after steps S1-S4, the tensile strength of the produced aluminum foil is 85 MPa-89 MPa, the elongation is 20%-23%, the surface roughness is 0.18≤Ra≤0.2μm, and the reflectivity is 88%-89.2%.

[0024] Further, the thickness tolerance of the aluminum foil is 98.5%-101.5%, the dynamic bending life is 520-550 thousand times, the bending radius R=1mm, and the bending frequency is 2 times / sec.

[0025] The beneficial effects of the present application are: the present application significantly improves the flexibility and tensile strength of the aluminum foil by optimizing the element ratio and the preparation process; the gradient annealing process effectively improves the mechanical properties and surface quality of the aluminum foil; the obtained aluminum foil product has uniform thickness and high surface smoothness, and is suitable for high-precision etching and repeated bending of electronic label applications; and the dynamic bending life is long, meeting the long-term use requirements of the lamp strip label.

[0026] The aluminum foil product obtained by the process has the following advantages:

[0027] The tensile strength is 87 MPa, which is significantly higher than the existing 8021 alloy of 75 MPa and the 1235 alloy of 70 MPa;

[0028] The elongation is 22%, which is significantly higher than the existing 8021 alloy of 18% and the 1235 alloy of 15%;

[0029] The dynamic bending life is 530,000 times, which is significantly higher than the existing 8021 alloy of 400,000 times and the 1235 alloy of 300,000 times;

[0030] The reflectivity is 88.5%, which is significantly higher than the existing 8021 alloy of 85% and the 1235 alloy of 82%. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The process flowchart of the present application. DETAILED DESCRIPTION

[0032] To make the purpose, technical scheme and advantages of the present application clearer and more explicit, the present application will be further described in detail below in combination with specific embodiments. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0033] Example 1:

[0034] A 0.05mm specification aluminum foil for lamp strip label, the raw material is composed of the following weight percentage of elements: Si: 0.4%, Fe: 0.5%, Cu: 0.08%, Mn: 0.03%, total amount of other unavoidable impurities and ≤0.15%, and the balance is Al.

[0035] A 0.05mm specification aluminum foil for lamp strip label and a preparation method thereof, comprising the following steps:

[0036] S1, material preparation:

[0037] The material is prepared according to the raw material ratio as the rolling blank, the blank thickness is 0.24mm, and the width is 1000mm;

[0038] S2, rolling:

[0039] S2.1 rough rolling: the blank with a thickness of 0.24 mm is rolled to a thickness of 0.128 mm by one pass, the rolling speed is 700 m / min, the rolling force is controlled at 1400 kN, the roughness of the work roll is 0.295 μm, the crown is 0.039 mm, the rolling oil temperature is controlled at 33℃, and the flow rate is 1200 L / min;

[0040] S2.2 coiling: two coils of aluminum foil with a thickness of 0.128 mm and a width of 1000 mm are coiled by high-purity 80# base rolling oil, and then cut to 2x0.128 mm x 980 mm composite material coils after cutting, the light transmittance of high-purity 80# base rolling oil is 91%, the kinematic viscosity at 40℃ is 1.5 mm² / s, and the acid value is 0.0032 mgKOH / g;

[0041] S2.3 finish rolling: the 2x0.128 mm x 980 mm composite material coil is rolled to 2x0.05 mm x 980 mm finished aluminum foil at a rolling speed of 750 m / min, the roughness of the work roll is 0.248 μm, the crown is 0.041 mm, the roll surface temperature is 45℃, and the final pass reduction rate is 18%;

[0042] S3, slitting:

[0043] The 2x0.05 mm x 980 mm aluminum foil after rolling is slitted into 12000 m (L) x 454 mm (b) x 0.05 mm (h) finished product specifications, and the unit tension is controlled at 36 N.

[0044] S4, the final product is obtained after heat treatment, and the heat treatment method adopts gradient annealing process, including:

[0045] S4.1, the temperature is raised from 100℃ to 260℃ at a rate of 25℃ / h, and the temperature is kept for 4 hours;

[0046] S4.2, the temperature is kept at 260℃ for 25 hours;

[0047] S4.3, the temperature is lowered from 260℃ to 240℃ at a rate of 1.5℃ / h, and the temperature is kept for 13 hours;

[0048] S4.4, natural cooling to 80℃.

[0049] The aluminum foil obtained by the above process has a tensile strength of 87 MPa, an elongation of 21%, a surface roughness of 0.18≤Ra≤0.2 μm, and a reflectivity of 88%.

[0050] The aluminum foil thickness tolerance is 98.5%-101.5%, the dynamic bending life is 530,000 cycles, the bending radius R=1mm, and the bending frequency is 2 times / second.

[0051] Example 2:

[0052] A 0.05mm specification aluminum foil for LED strip labels is made of the following elements by weight percentage: Si: 0.5%, Fe: 0.6%, Cu: 0.09%, Mn: 0.04%, other unavoidable impurities totaling ≤0.15%, with the balance being Al.

[0053] An aluminum foil for LED strip labels with a specification of 0.05mm and its preparation method thereof, comprising the following steps:

[0054] S1. Material preparation:

[0055] Prepare the raw materials according to the proportions to form the rolling blank. The blank thickness is 0.24 mm and the width is 1000 mm.

[0056] S2, Rolling:

[0057] S2.1 Rough rolling: The billet with a thickness of 0.24 mm is rolled in one pass to a thickness of 0.128 mm and a width of 1000 mm. The rolling speed is 750 m / min, the rolling force is controlled at 1550 kN, the roughness of the work roll is 0.300 μm, the crown is 0.040 mm, the rolling oil temperature is controlled at 35℃, and the flow rate is 1200 L / min.

[0058] S2.2 Coiling: Two rolls of aluminum foil with a thickness of 0.128mm and a width of 1000mm are double-jointed using high-purity 80# base rolling oil and then cut into a composite roll with edges of 2×0.128mm×980mm. The high-purity 80# base rolling oil has a light transmittance of 91.5%, a kinematic viscosity of 1.59mm² / s at 40℃, and an acid value of 0.0034mgKOH / g.

[0059] S2.3 Finishing Rolling: The composite coil of 2×0.128mm×980mm is rolled into finished aluminum foil of 2×0.05mm×980mm at a rolling speed of 900m / min. The surface roughness of the work roll is 0.250μm, the crown is 0.042mm, the roll surface temperature is 47℃, and the final pass reduction is 18%.

[0060] S3, Slicing:

[0061] The rolled aluminum foil (2×0.05mm×980mm) is cut into finished product specifications of 12000m (L)×454mm (b)×0.05mm (h), with the unit tension controlled at 36N.

[0062] S4, obtaining the final product after heat treatment, the heat treatment method adopts gradient annealing process, including:

[0063] S4.1, increasing from 100℃ to 260℃ at a heating rate of 25℃ / h, and keeping for 4 hours;

[0064] S4.2, keeping at 260℃ for 25 hours;

[0065] S4.3, decreasing from 260℃ to 240℃ at a cooling rate of 1.5℃ / h, and keeping for 13 hours;

[0066] S4.4, naturally cooling to 80℃.

[0067] The aluminum foil obtained through the above process has a tensile strength of 88MPa, an elongation of 22%, a surface roughness of 0.18≤Ra≤0.2μm, and a reflectivity of 89%.

[0068] The aluminum foil has a thickness tolerance of 98.5%-101.5%, a dynamic bending life of 540,000 times, a bending radius R=1mm, and a bending frequency of 2 times / s.

[0069] Example 3:

[0070] An aluminum foil with a specification of 0.05mm for lamp strip labels, the raw material is composed of the following weight percentage of elements: Si: 0.6%, Fe: 0.7%, Cu: 0.10%, Mn: 0.05%, and other unavoidable impurities totaling ≤0.15%, and the balance being Al.

[0071] An aluminum foil with a specification of 0.05mm for lamp strip labels and a preparation method thereof, including the following steps:

[0072] S1, preparing materials:

[0073] Prepare materials according to the raw material ratio as a rolling blank, the blank thickness is 0.24mm, and the width is 1000mm;

[0074] S2, rolling:

[0075] S2.1 rough rolling: the blank with a thickness of 0.24mm is rolled to a thickness of 0.128mm and a width of 1000mm in one pass, the rolling speed is 700-800m / min, the rolling force is controlled at 1400-1700kN, the roughness of the work roll is 0.305μm, the crown is 0.041mm, the rolling oil temperature is controlled at 37℃, and the flow rate is 1200L / min;

[0076] S2.2 Laminating: two 0.128 mm thick and 1000 mm wide aluminum foils are laminated by high-purity 80# base rolling oil, and then cut to 2 x 0.128 mm x 980 mm composite material rolls, the light transmittance of the high-purity 80# base rolling oil is 92%, the kinematic viscosity at 40℃ is 1.7 mm² / s, and the acid value is 0.0035 mgKOH / g;

[0077] S2.3 Finishing rolling: the 2 x 0.128 mm x 980 mm composite material rolls are rolled to 2 x 0.05 mm x 980 mm finished aluminum foils at a rolling speed of 1050 m / min, the roughness of the work roll is 0.252 μm, the crown is 0.043 mm, the roll surface temperature is 47℃, and the final pass reduction is 18%;

[0078] S3, Slitting:

[0079] The rolled 2 x 0.05 mm x 980 mm aluminum foils are slitted into 12000 m (L) x 454 mm (b) x 0.05 mm (h) finished specifications, and the unit tension is controlled at 36 N.

[0080] S4, After heat treatment, the final product is obtained, and the heat treatment method adopts gradient annealing process, including:

[0081] S4.1, the temperature is raised from 100℃ to 260℃ at a rate of 25℃ / h, and the temperature is kept for 4 hours;

[0082] S4.2, the temperature is kept at 260℃ for 25 hours;

[0083] S4.3, the temperature is lowered from 260℃ to 240℃ at a rate of 1.5℃ / h, and the temperature is kept for 13 hours;

[0084] S4.4, natural cooling to 80℃.

[0085] The aluminum foil obtained by the above process has a tensile strength of 89 MPa, an elongation of 23%, a surface roughness of 0.18≤Ra≤0.2 μm, and a reflectivity of 89.2%.

[0086] The aluminum foil thickness tolerance is 101.5%, the dynamic bending life is 550,000 times, the bending radius R is 1 mm, and the bending frequency is 2 times / s.

[0087] Comparative Example 1:

[0088] The blank selected in this comparative example is a blank made of common 8011 alloy, the Fe content is adjusted to 0.49wt%, forming a dispersedly distributed Al-Fe-Si intermetallic compound with Si; the Si content is adjusted to 0.4wt%; other impurity elements remain unchanged, and the blank with a specification of 8011-H14, 0.24mm*L is prepared, and the rolling and gradient annealing process is the same as that in Example 1, to obtain an aluminum foil product with a thickness of 0.05mm. The obtained aluminum foil product has a thickness of 0.05mm, a width of 510mm, a thickness deviation of 1.5%, a tensile strength of 73MPa, an unqualified tensile strength, an elongation of 23%, an oil removal effect of A+, and an unqualified SI-Fe alloy ratio.

[0089] Comparative Example 2:

[0090] The blank selected in this comparative example is the same as that in Example 2, and the overall steps are the same, except that the annealing process parameters in this comparative example are adjusted as follows:

[0091] First stage (ramp heating): 8 hours from room temperature to 240℃, the first 4 hours from room temperature to 100℃, and the last 4 hours from 100℃ to 240℃;

[0092] Second stage (holding): holding at 240℃ for 25 hours;

[0093] Third stage (slow cooling): cooling from 240℃ to 220℃ at a rate of 1.5℃ / h, holding for 13 hours;

[0094] Fourth stage (final cooling): 7 hours from 220℃ to 80℃, and the product is discharged after natural cooling.

[0095] Through this process, an aluminum foil product with a thickness of 0.05mm is obtained. The obtained aluminum foil product has a thickness of 0.05mm, a width of 510mm, a thickness deviation of 1.5%, a tensile strength of 93MPa, an elongation of 18%, a shrinkage of 10 seconds of water brushing at the middle 150mm, and unclean oil removal, an oil removal effect of A+ is not reached, the oil removal effect is unqualified, and the SI-Fe alloy ratio is qualified.

[0096] Comparative Example 3:

[0097] The blank selected in this comparative example is the same as that in Example 3, and the overall steps are the same, except that the annealing process parameters in this comparative example are adjusted as follows:

[0098] First stage (ramp heating): 8 hours from room temperature to 270℃, the first 4 hours from room temperature to 100℃, and the last 4 hours from 100℃ to 270℃;

[0099] Second stage (holding): holding at 270℃ for 25 hours;

[0100] Third stage (slow cooling): cooling from 270℃ to 240℃ at a rate of 1.5℃ / h, holding for 13 hours;

[0101] Fourth stage (final cooling): 8 hours from 240℃ to 80℃, natural cooling after furnace.

[0102] Through the process, the thickness of the obtained aluminum foil product is 0.05mm, the width is 510mm, the thickness deviation is 1.5%, the tensile strength is 80MPa, the tensile strength is unqualified, the elongation is 25%, the oil removal effect is A+, and the SI-Fe alloy ratio is qualified.

[0103] Comparative Example 4:

[0104] The billet selected in this comparative example is the same as that in Example 1, and the overall steps are the same, except that only the inlet thickness and outlet thickness in the rolling process are changed. The thickness deviation of the obtained aluminum foil product is ±1.6%, which is large and unqualified, the tensile strength is 92MPa, the elongation is 24.5%, the oil removal effect is A+, and the SI-Fe alloy ratio is qualified.

[0105] Through detection of the aluminum foil prepared in Examples 1-3 and Comparative Examples 1-4, the detection results are as follows in Table 1:

[0106] Table 1 Comparison table of aluminum foil product detection results

[0107]

[0108] Result analysis: As can be seen from Table 1, the aluminum foil produced by the rolling and annealing process of Examples 1-3 meets the predetermined requirements in thickness deviation, tensile strength, elongation, oil removal effect, and SI-Fe alloy ratio, and excellent mechanical property combination is obtained, which meets the requirements of lamp strip label on material flexibility and surface finish.

[0109] It is shown by Comparative Example 1 that slight differences in trace elements cause fluctuations in metallurgical quality, and the rolling and gradient annealing process is the same as that of Example 1, and the obtained aluminum foil product has a tensile strength of 73MPa, which is unqualified.

[0110] It is shown by Comparative Example 2 that by adjusting the annealing process, the elongation of the obtained aluminum foil product is 18%, which is unqualified, the middle 150mm part shrinks after brushing water for 10 seconds, and cannot reach A+, and the aluminum foil elongation is unqualified.

[0111] It is shown by Comparative Example 3 that by adjusting the annealing process, the tensile strength of the obtained aluminum foil product is 80MPa, which is unqualified.

[0112] By the comparative example 4, it is shown that other processes are not changed, only the entry thickness and the exit thickness in the rolling process are changed, the thickness deviation of the obtained aluminum foil product is in ±1.6%, the thickness deviation is large, unqualified.

[0113] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation on the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all variations and modifications falling within the scope and boundary of the appended claims, or the equivalent forms of such scope and boundary.

Claims

1. A method for preparing aluminum foil for 0.05mm specification LED strip labels, characterized in that: The raw materials contain the following elements by weight percentage Composition: Si: 0.4-0.6%, Fe: 0.5-0.7%, Cu: 0.08%-0.10%, Mn: 0.03%-0.05%, other unavoidable impurities ≤0.15%, balance Al. The preparation method includes the following steps: S1. Material preparation: Prepare the raw materials according to the proportions to form the rolling blank. The blank thickness is 0.24 mm and the width is 1000 mm. S2, Rolling: S2.1 Rough rolling: The billet with a thickness of 0.24mm is rolled to 0.128mm×1000mm in one pass at a rolling speed of 700-800m / min and a rolling force controlled at 1400-1700kN. S2.2 Coiling: Two rolls of 0.128mm×1000mm thick aluminum foil are double-jointed using high-purity 80# base rolling oil, and the cut edges are 2×0.128mm×980mm composite rolls. S2.3 Finish rolling: The composite coil is rolled to 2×0.05mm×980mm at a rolling speed of 750-1050m / min, with a final pass reduction of 18%; S3, Slicing: The rolled aluminum foil is then cut into sections. S4. The final product is obtained after heat treatment, which adopts a gradient annealing process, including: S4.

1. Increase the temperature from 100℃ to 260℃ at a rate of 25℃ / h and hold for 4 hours; S4.2, Keep warm at 260℃ for 25 hours; S4.3, Cool from 260℃ to 240℃ at a cooling rate of 1.5℃ / h, and hold for 13 hours; S4.4, allow to cool naturally to 80℃.

2. The method for preparing aluminum foil for 0.05mm specification LED strip labels according to claim 1, characterized in that: In step S2.1, the roughness of the work roll is 0.295-0.305μm, the crown is 0.039-0.041mm, the rolling oil temperature is controlled at 35±2℃, and the flow rate is 1200L / min.

3. The method for preparing aluminum foil for 0.05mm specification LED strip labels according to claim 1, characterized in that: In step S2.3, the finishing rolling process, the roughness of the work roll is 0.248-0.252μm, the crown is 0.041-0.043mm, and the roll surface temperature is ≤45℃.

4. The method for preparing aluminum foil for 0.05mm specification LED strip labels according to claim 1, characterized in that: In step S2.2, the high-purity 80# base rolling oil has a transmittance of 91%-92% and a kinematic viscosity of 1.5-1.7 mm at 40℃. 2 / s, acid value ≤0.0035mgKOH / g.

5. The method for preparing aluminum foil for 0.05mm specification LED strip labels according to claim 1, characterized in that: After steps S1-S4, the produced aluminum foil has a tensile strength of 85 MPa-89 MPa, an elongation of 20%-23%, a surface roughness of 0.18≤Ra≤0.2μm, and a reflectivity of 88%-89.2%.

6. The method for preparing aluminum foil for 0.05mm specification LED strip labels according to claim 5, characterized in that: The aluminum foil thickness tolerance is 98.5%-101.5%, the dynamic bending life is 520,000-550,000 times, the bending radius R=1mm, and the bending frequency is 2 times / second.

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