Medicine foil and rapid machining process thereof based on continuous casting and rolling

Abstract

The invention relates to a continuous casting and rolling rapid processing technology of a medicine foil. The process comprises the steps of raw material preparation, smelting and refining, continuous casting, cooling treatment, heating and rough rolling, finish rolling, annealing treatment, surface treatment, slitting and the like. By controlling the smelting temperature, the casting speed, the rolling speed, the roller surface roughness, the annealing parameters and other process conditions, efficient production of the aluminum foil is achieved, and the surface smoothness, the thickness precision, the tensile strength and the ductility of the medicine foil are guaranteed. The thickness of the finished medicine foil is 0.02-0.04 mm, the tensile strength is 80-120 MPa, the ductility is not lower than 1.5%, and the surface roughness Ra value is controlled to be 0.1-0.3 micron. The process can produce high-quality medicine foil meeting the medicine packaging requirement, has the advantages of being efficient, stable, energy-saving and environment-friendly, and is suitable for large-scale industrial production.

Description

Technical Field

[0001] The invention relates to the production field of medicine foil, and more particularly to a medicine foil and a rapid processing technology thereof based on continuous casting and continuous rolling. Background Art

[0002] In the field of modern packaging materials, aluminum foil has become one of the main choices for pharmaceutical packaging due to its excellent barrier properties, light weight and good forming ability. As a specific application of aluminum foil, pharmaceutical foil not only needs to have the excellent physical properties of general aluminum foil, but also needs to meet the higher requirements of pharmaceutical packaging for hygiene, safety and durability. With the development of the pharmaceutical industry and the continuous increase in market demand, the production process of pharmaceutical foil is also constantly innovating and improving to meet higher quality standards and production efficiency.

[0003] Traditional pharmaceutical foil production usually adopts a multi-pass cold rolling process. This traditional process has several significant problems:

[0004] (1) The multi-pass rolling process is cumbersome and has a long cycle. Especially during multiple rolling and annealing processes, the deformation recovery of the metal will be reduced, affecting the overall production efficiency.

[0005] (2) Due to the need for multiple heating and cooling processes, the traditional process performs poorly in terms of energy consumption, which not only increases production costs but also does not conform to the current trend of green manufacturing.

[0006] (3) The traditional rolling process is easily affected by changes in process parameters, such as temperature and speed, which may lead to uneven thickness, surface defects and unstable mechanical properties of the pharmaceutical foil products, making it difficult to meet the high standards of pharmaceutical packaging.

[0007] (4) During the multiple rolling processes, the generation of scraps is inevitable, which leads to a decrease in material utilization and further increases production costs.

[0008] Based on the above background, the present invention proposes a medicine foil and a rapid processing technology based on continuous casting and rolling, aiming to further optimize the production process of medicine foil, improve production efficiency, reduce energy consumption, and ensure the high quality and stability of medicine foil products to meet the increasingly stringent requirements in the field of modern pharmaceutical packaging. Summary of the invention

[0009] In order to solve the deficiencies of the prior art, a medicine foil and a rapid processing technology thereof based on continuous casting and rolling are provided, and the specific scheme is as follows:

[0010] A rapid processing technology for continuous casting and rolling of medicine foil, the process comprising the following steps:

[0011] S1. Raw material preparation: electrolytic aluminum with an aluminum content of not less than 99.8% is selected as the main raw material, and 0.3% to 0.6% manganese and 0.05% to 0.2% magnesium are added;

[0012] S2. Melting and refining: The melting temperature is controlled at 720℃~750℃, and stirring and degassing treatment are performed;

[0013] S3, continuous casting process: the casting temperature is controlled at 680℃~710℃, the casting speed is 50~80mm / min, and the ingot thickness is 8~12mm;

[0014] S4, cooling treatment: water cooling temperature is controlled at 15℃~20℃;

[0015] S5, heating and rough rolling: heating the ingot to 450℃~500℃, the rough rolling speed is 1.0~1.5m / s, the initial rolling temperature is 450℃~470℃, and the thickness of the aluminum strip after rough rolling is controlled at 3~5mm;

[0016] S6, finishing rolling: the finishing rolling temperature is 200℃~250℃, the finishing rolling speed is 2.0~2.5m / s, and the final aluminum foil thickness is 0.02~0.04mm;

[0017] S7, annealing treatment: annealing temperature is 300 ℃ ~ 350 ℃, annealing time is 2 ~ 3 hours;

[0018] S8. Surface treatment and slitting: slitting width is 50-300mm, winding tension is 2-5N.

[0019] Furthermore, the surface roughness Ra of the upper and lower rollers in S5 is controlled within a range of 0.6 to 1.2 μm.

[0020] Furthermore, the surface roughness Ra of the upper and lower rollers in S6 finishing rolling is controlled within a range of 0.2 to 0.6 μm.

[0021] Furthermore, the refining agent used in the refining process is a mixture of sodium chloride and potassium chloride in a ratio of 1:1.

[0022] Furthermore, the casting mold used in the continuous casting process is a double-roller casting mold, and the mold gap is controlled at 8 to 12 mm.

[0023] Furthermore, a four-roll rolling mill is used in the rough rolling process, and the rolling pressure is controlled at 100-150 MPa.

[0024] Furthermore, the working temperature of the rollers during the finishing rolling process is controlled at 150°C to 200°C.

[0025] Furthermore, the annealing process is carried out in an annealing furnace, and the protective atmosphere in the annealing furnace is nitrogen.

[0026] The medicine foil prepared by the processing technology has a thickness of 0.02-0.04 mm, a tensile strength of 80-120 MPa, an elongation of not less than 1.5%, and a surface roughness Ra value controlled at 0.1-0.3 μm.

[0027] Beneficial effects:

[0028] This patent provides a rapid processing technology for continuous casting and rolling of medicine foil, which has the following beneficial effects:

[0029] (1) By optimizing the continuous casting and rolling process parameters, such as casting temperature, casting speed, rolling speed, etc., efficient production of aluminum foil is achieved, the processing time is shortened, and it is suitable for large-scale production of aluminum foil for pharmaceutical packaging.

[0030] (2) The precise control of the surface roughness of the upper and lower rollers (0.6-1.2 μm in the rough rolling stage and 0.2-0.6 μm in the fine rolling stage) ensures the smoothness and flatness of the surface of the medicine foil, effectively avoids surface defects, and improves the appearance quality of the medicine foil.

[0031] (3) By optimizing the finishing speed, temperature and rolling pressure, the final aluminum foil thickness can be ensured to be within the range of 0.02 to 0.04 mm, meeting the strict requirements of the thickness accuracy of the medicine foil and ensuring the consistency and uniformity of the finished product.

[0032] (4) This process ensures that the medicine foil has excellent tensile strength (80-120 MPa) and elongation (≥1.5%) through reasonable alloy ratio and annealing treatment process, meeting the requirements of medicine packaging for aluminum foil strength and toughness.

[0033] (5) The oxidation treatment and annealing steps in this process optimize the surface properties of the drug foil, giving it excellent barrier properties and corrosion resistance, ensuring that the drugs are well protected during storage and transportation. DETAILED DESCRIPTION

[0034] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with examples. The examples are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0035] Embodiment 1:

[0036] (1) Raw material preparation: Electrolytic aluminum with an aluminum content of 99.8% is selected, and 0.5% manganese and 0.1% magnesium are added as the main raw materials.

[0037] (2) Melting and refining: The aluminum alloy was melted to 740°C, and a refining agent of 1:1 sodium chloride and potassium chloride was added for refining, and the mixture was stirred to degas and kept for 10 minutes.

[0038] (3) Continuous casting process: The aluminum liquid temperature is maintained at 700°C and is cast through a double-roll casting mold (gap 10 mm). The casting speed is 60 mm / min and the ingot thickness is 10 mm.

[0039] (4) Cooling treatment: A water cooling system is used, the water temperature is controlled at 18°C, and the flow rate is 30L / min.

[0040] (5) Heating and rough rolling: The ingot is heated to 480°C, the rough rolling speed is 1.2 m / s, the initial rolling temperature is 460°C, the thickness of the aluminum strip after rolling is 4 mm, and the surface roughness Ra of the rolling roller is 0.8 μm.

[0041] (6) Finishing rolling: The finishing rolling temperature of the aluminum strip is 220°C, the rolling speed is 2.3 m / s, the final aluminum foil thickness is 0.03 mm, and the roller surface roughness Ra is 0.4 μm.

[0042] (7) Annealing: anneal at 330°C for 2 hours with nitrogen protection.

[0043] (8) Surface treatment and slitting: The surface of the aluminum foil is oxidized, the thickness of the oxide layer is 0.03 mm, the slitting width is 100 mm, and the winding tension is 3N.

[0044] Embodiment 2:

[0045] (1) Raw material preparation: Select electrolytic aluminum with an aluminum content of 99.85%, add 0.3% manganese and 0.05% magnesium.

[0046] (2) Melting and refining: The melting temperature is 730°C, and a 1:1 mixed refining agent of sodium chloride and potassium chloride is added, and the refining is carried out for 10 minutes.

[0047] (3) Continuous casting process: The aluminum liquid temperature is 690°C, a double-roll casting mold is used, the gap is 8 mm, the casting speed is 55 mm / min, and the ingot thickness is 9 mm.

[0048] (4) Cooling treatment: The water cooling system temperature is maintained at 16°C and the water flow rate is 25 L / min.

[0049] (5) Heating and rough rolling: The ingot is heated to 470°C, the rough rolling speed is 1.0 m / s, the initial rolling temperature is 450°C, the thickness of the aluminum strip after rolling is 3.5 mm, and the surface roughness Ra of the rolling roller is 1.0 μm.

[0050] (6) Finishing rolling: The finishing rolling temperature is 230°C, the speed is 2.1 m / s, the aluminum foil thickness is 0.025 mm, and the roller surface roughness Ra is 0.3 μm.

[0051] (7) Annealing: annealing at 320°C for 3 hours.

[0052] (8) Surface treatment and slitting: After oxidation treatment, the thickness of the aluminum foil oxide layer is 0.02 mm, the slitting width is 150 mm, and the winding tension is 4 N.

[0053] Embodiment 3:

[0054] (1) Raw material preparation: Select electrolytic aluminum with an aluminum content of 99.9%, add 0.4% manganese and 0.2% magnesium.

[0055] (2) Melting and refining: The melting temperature is 750°C, and a 1:1 ratio of sodium chloride and potassium chloride refining agent is added, and the refining is carried out for 15 minutes.

[0056] (3) Continuous casting process: The aluminum liquid temperature is controlled at 705°C, the casting speed is 75 mm / min, the mold gap is 12 mm, and the ingot thickness is 12 mm.

[0057] (4) Cooling treatment: The water cooling temperature is 17°C and the flow rate is 40L / min.

[0058] (5) Heating and rough rolling: The ingot is heated to 490°C, the rough rolling speed is 1.3 m / s, the initial rolling temperature is 470°C, the aluminum strip thickness is 5 mm, and the roller surface roughness Ra is 0.6 μm.

[0059] (6) Finishing rolling: The finishing rolling temperature is 210°C, the speed is 2.5 m / s, the aluminum foil thickness is 0.02 mm, and the roller surface roughness Ra is 0.2 μm.

[0060] (7) Annealing treatment: annealing at 340°C for 2.5 hours.

[0061] (8) Surface treatment and slitting: The oxide layer thickness is 0.01 mm, the slitting width is 200 mm, and the winding tension is 5 N.

[0062] As a further improvement, the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rapid processing technology for continuous casting and rolling of medicine foil, characterized in that: The process comprises the following steps: S1. Raw material preparation: electrolytic aluminum with an aluminum content of not less than 99.8% is selected as the main raw material, and 0.3% to 0.6% manganese and 0.05% to 0.2% magnesium are added; S2. Melting and refining: The melting temperature is controlled at 720℃~750℃, and stirring and degassing treatment are performed; S3, continuous casting process: the casting temperature is controlled at 680℃~710℃, the casting speed is 50~80mm / min, and the ingot thickness is 8~12mm; S4, cooling treatment: water cooling temperature is controlled at 15℃~20℃; S5, heating and rough rolling: heating the ingot to 450℃~500℃, the rough rolling speed is 1.0~1.5m / s, the initial rolling temperature is 450℃~470℃, and the thickness of the aluminum strip after rough rolling is controlled at 3~5mm; S6, finishing rolling: the finishing rolling temperature is 200℃~250℃, the finishing rolling speed is 2.0~2.5m / s, and the final aluminum foil thickness is 0.02~0.04mm; S7, annealing treatment: annealing temperature is 300 ℃ ~ 350 ℃, annealing time is 2 ~ 3 hours; S8. Surface treatment and slitting: slitting width is 50-300mm, winding tension is 2-5N.

2. The rapid processing technology of continuous casting and rolling of medicine foil according to claim 1 is characterized in that: The surface roughness Ra of the upper and lower rollers in S5 is controlled at 0.6 to 1.2 μm.

3. The rapid processing technology of continuous casting and rolling of medicine foil according to claim 1 is characterized in that: The surface roughness Ra of the upper and lower rolls in S6 finishing rolling is controlled at 0.2 to 0.6 μm.

4. The rapid processing technology of continuous casting and rolling of medicine foil according to claim 1 is characterized in that: The refining agent used in the refining process is a mixture of sodium chloride and potassium chloride in a ratio of 1:

1.

5. The rapid processing technology of continuous casting and rolling of medicine foil according to claim 1 is characterized in that: The casting mold used in the continuous casting process is a double-roller casting mold, and the mold gap is controlled at 8-12 mm.

6. The rapid processing technology of continuous casting and rolling of medicine foil according to claim 1, characterized in that: A four-roll rolling mill is used in the rough rolling process, and the rolling pressure is controlled at 100-150 MPa.

7. The rapid processing technology of continuous casting and rolling of medicine foil according to claim 1, characterized in that: The working temperature of the rollers during the finishing rolling process is controlled at 150°C to 200°C.

8. The rapid processing technology of continuous casting and rolling of medicine foil according to claim 1, characterized in that: The annealing process is carried out in an annealing furnace, and the protective atmosphere in the annealing furnace is nitrogen.

9. The medicine foil prepared by the processing technology according to any one of claims 1 to 8, characterized in that: The medicine foil has a thickness of 0.02-0.04 mm, a tensile strength of 80-120 MPa, an elongation of not less than 1.5%, and a surface roughness Ra value controlled at 0.1-0.3 μm.