The production process of this foil is generally divided into the following steps.
Step 1 Aluminum Foil Production
Aluminum smelting: Aluminum ingots are melted in special furnaces and become liquid.
Casting: Molten aluminum in the form of large sheets. It is poured.
Hot rolling: Aluminum sheets are passed under high pressure between two rollers to reduce their thickness. This process is repeated several times until the thickness of the sheet reaches the desired size.
Cold rolling: After hot rolling, the sheets are rolled at a lower temperature to improve their mechanical properties. .
Annealing: To soften the foil and reduce internal stresses, it is heated at a high temperature and then cooled slowly.
Final rolling: < /b> At this stage, the foil is rolled to a very thin and uniform thickness.
Step 2 Cover with polyethylene
Extrusion: Molten polyethylene is passed through a narrow orifice under pressure and is placed as a thin layer on the surface of aluminum foil.
Bonding: Using heat and pressure, the polyethylene layer is completely attached to the aluminum foil and forms a single layer.
Step 3 Quality Control
Thickness measurement: The thickness of aluminum foil with polyethylene is measured accurately to meet the set standards.
Mechanical properties test: Strength Tensile, tear resistance and other mechanical properties of the foil are tested.
Testing of barrier properties: The ability of the foil to prevent the penetration of moisture, gases and light is checked.
Step 4 Cut and Package
Cutting: The foil is cut to the desired sizes.
Packaging: The cut foils are packed in rolls or sheets and for Use are sent.
Factors affecting the quality of this aluminum foil
Aluminum purity: The higher the aluminum purity, the better the quality of the foil.
Thickness of aluminum and polyethylene layers: Suitable thickness of this layer. affects the mechanical and barrier properties of the foil.
Rolling and annealing temperature: The appropriate temperature in these stages affects the mechanical and structural properties of the foil.
Type of polyethylene: The type of polyethylene used in coating affects the chemical and thermal properties of the foil.
