How to choose alloy for laminated aluminum foil

A rolled non-ferrous metal with good mechanical, processability, and barrier qualities is Aluminum Foil . There are a few distinctions between the hot rolling and cast rolling techniques used to produce aluminum foil in terms of their mechanics and end products. hot rolling process Aluminum foil is often hot rolled at temperatures exceeding 400 °C. The term "hot rolling" refers to the process of rolling at a higher temperature.

The preparation of the raw materials, heating, homogenization treatment, rolling, quenching and tempering, as well as other steps, are included in the primary technical process.

1.Preparation of raw materials: Aluminum alloy billet, which is typically formed from aluminum ingots by smelting, recrystallization, and other processes, serves as the raw material for hot-rolled aluminum foil. This billet of aluminum alloy has a highly pure and homogenous composition.

2. Heating: Place the billet of aluminum alloy in the furnace for a consistent heating procedure to get the proper rolling temperature.

3.Homogenization treatment: Make the structure of the heated aluminum alloy billet more consistent and minimize internal tension in the billet by regulating treatment duration and temperature.

4. Rolling: Use a hot rolling machine to roll the homogenized aluminum alloy billet. Hot rolling mills often have many rollers that repeatedly pass the material to produce the appropriate foil thickness.

5. Quenching and tempering: Quenching and tempering are necessary to remove the tension created during the rolling process and to increase the hardness and strength of the aluminum foil after hot rolling is complete. Casting technique The process of casting molten aluminum into billets and rolling those billets on a roller mill is referred to as casting and rolling.

Cast rolling, which is appropriate for the manufacturing of thinner aluminum foil, is more flexible in the management of temperature and rolling thickness than hot rolling.

1. Raw material preparation: Molten aluminum, often acquired through electrolysis or other smelting processes, serves as the raw material for cast-rolled aluminum foil.

2. Casting: Melt aluminum is poured into a mold to be formed into a billet. The finished aluminum foil's morphology and characteristics will depend on the size and form of the casting mold. Send the aluminum alloy billet into the rolling machine with a roller table for rolling in step three. In roller mills, the billet is often passed through many pairs of rolls in order to achieve the necessary foil thickness. Cast rolling often uses a lower rolling temperature than hot rolling, typically less than 200°C.

3. Quenching and tempering: To reduce stress and increase the hardness and tensile strength of aluminum foil, quenching and tempering are also necessary after casting and rolling.

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Hot Rolled and Cast Rolled Comparison

1. The method is more simpler for casting and rolling since they are made immediately from molten aluminum, whereas hot rolling requires several processes such as heating and homogenization.

2. Mechanical characteristics: The hot-rolled aluminum foil has a generally homogeneous structure and reasonably acceptable mechanical properties as a result of the high temperature heating and homogeneity treatment.

Cast-rolled aluminum foil has a rather uneven microstructure and a variety of mechanical characteristics.

1. Product characteristics: Cast-rolled aluminum foil has relatively poor surface quality and flatness while hot-rolled aluminum foil has good surface quality and flatness, making it appropriate for situations requiring high surface requirements, such as the packaging industry. It is appropriate for some situations with laxer surface requirements.

For laminate aluminum foils with thickness over 30 mic ,choose hot-rolled alloy or cast-rolled alloy?

Answer： cast- rolled alloy Casting and rolling processes work well for producing aluminum foil alloys for composite materials with a thickness of more than 30 micrometers. The following benefits of the casting-rolling method over hot-rolling are: 1. Lower process temperature: The rolling and casting operations are typically performed at temperatures below 200°C. Casting and rolling can better control the thickness and form than hot rolling at temperatures exceeding 400°C. In order to prevent peeling between the aluminum foil and the composite layer and the distortion of the composite layer, a lower process temperature is advantageous for the manufacturing of composite aluminum foil.

2. A more uniform raw material structure: The molten aluminum will develop a homogeneous structure throughout the casting process, resulting in a cast-rolling aluminum foil with a uniform distribution of hardness and strength. Due to the high temperature heating and homogenization process used to produce hot-rolled aluminum foil, the raw material structure may become uneven.

Superior ductility: Cast-rolled aluminum foil has a homogenous structure and a lower process temperature, which allows the tiny grains in the raw material to be maintained, leading to superior ductility. Good ductility can enhance the stability and performance of stamping composite aluminum foil during production.

For thin laminated aluminum foil, it is better to choose hot-rolled alloy or cast-rolled alloy?

Answer: More customer choose hot-rolling alloy . In addition to other uses, composite aluminum foil with a thickness of 9 to 15 m is frequently employed in food packaging. There are adequate alloy possibilities for both hot rolling and cast rolling for this thickness range. Specific selection views can be formed, nevertheless, depending on the requirements for a certain product, the nature of the production process, the associated costs, and other variables.

The following features and benefits of the hot rolling technique for producing aluminum foil:

1.High-quality surface quality: The hot rolling method may produce an aluminum foil surface that is comparatively flat and smooth, which has certain benefits when dealing with situations where the product has strict surface requirements. Unquestionably, food and pharmaceutical packaging needs to be sanitary, odor-free, and moisture-proof. Hot rolling may produce greater surface flatness, which helps to assure product quality.

2. Accurate thickness control: The hot rolling technique allows for a more accurate control of aluminum foil thickness to fulfill product specifications. The rolling technique, in particular for the thickness range of 9-15 m, may provide robust and compliant products while allowing for more accurate thickness control at a lower temperature.

The cast-rolling procedure, however, also has various qualities and benefits that make it suited for particular applications:

1. Cost-effectiveness: Compared to hot rolling, the cast rolling technique often results in cheaper manufacturing costs. Casting and rolling have low process temperatures, which allows for quick cooling to occur during the operation, saving time and energy.

2. Flexibility: During manufacturing, the casting and rolling processes may swiftly change the width and thickness of aluminum foil to accommodate products with various thickness needs. The casting and rolling process offers a more adaptable manufacturing approach for companies with a variety of and quickly shifting market needs.

3. Ductility: The casting and rolling process can keep the raw material structure reasonably homogeneous and the process temperature low, which results in high ductility. Good ductility enhances the stamping performance and stability of the 9–15 mm composite aluminum foil during production. In summary, both hot rolling and casting rolling techniques provide adequate alloy possibilities for composite aluminum foil with a thickness of 9–15 m. Hot rolling offers superior surface quality and accurate thickness control, making it ideal for items with strict surface requirements.

On the other side, cast-rolling provides affordability, manufacturing flexibility, and high ductility. As a result, choosing an appropriate method should take into account both individual production demands and product requirements.