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Jumbo Aluminum Foil 8011-O Household Alu Rolls Food Grade
The surface of the aluminum foil should be smooth and clean, and there should be no defects such as corrosion, oxidation, wrinkles, missing coating, roll marks, scratches, pinholes and scars, etc. Hand touch/wipe, and there should be no obvious aluminum powder or other dust on the surface of the aluminum foil; The surface is allowed to have scattered, slight waves and imprints;
Obvious emulsion marks, imprints, and oil spots formed after the burning of rolling lubricating oil are not allowed, and the width of one side is less than 4.5 mm.
The aluminum foil should not be broken, folded, clipped or torn.
Only one broken end is allowed in every 5 rolls, and the broken end shall be clearly marked. The inner and outer packaging of the roll shall be marked with the joint mark, and the joint shall be treated with a black circle.
Aluminum foil annealing method: Ordinary air resistance furnace: For general industrial aluminum foil, the common air resistance furnace is commonly used. There is an axial circulation fan in the furnace to ensure that the positive pressure cleaning fan in the furnace cavity blows outside air into the furnace. , With this annealing method, as long as the annealing process is selected reasonably, the residual oil on the surface of the aluminum foil can be completely eliminated, and the surface quality and performance of the aluminum foil are good. Protective gas annealing: The protective gas is usually nitrogen. The method of burning and decomposing liquefied gas can be adopted or the nitrogen can be directly introduced into the annealing furnace. The nitrogen content can reach more than 80%. Because there is no oxygen in this method, the rolling oil only evaporates without oxidation and combustion, so even if it is a high-viscosity rolling oil, oil spots and oil adhesion are not easy to appear. Negative pressure annealing: pressure annealing does not use the method of blowing air into the furnace, household foil, and maintaining the positive pressure in the furnace to exhaust the fumes, but the method of exhausting the air outside the furnace to maintain the negative pressure in the furnace. This method, rolling The oil volatilizes quickly, which can shorten the time for annealing and degreasing. Vacuum furnace annealing: Aluminum foil vacuum furnace annealing has a good degreasing effect. The surface quality is good, but the time is long and the cost is high. At present, only some electronic aluminum foils that must be annealed at high temperature and strictly required to prevent surface oxidation are annealed in a vacuum furnace.
Soft Temper Jumbo Roll Aluminum Foil 14 Micron We know that aluminum foil is divided into hard state and soft state.
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