1. Appearance, the aluminized surface should be clean, bright, flat, without lamination, crack indentation. No corrosion marks and rough surfaces left by burning oil.
2. Remove oil stains. The aluminum foil bag for composite packaging should have a grade of AB. The test method is as follows: the unstained and damaged aluminum foil sample is placed on a 45-degree pallet, and the test liquid is dropped on both sides and in the middle of the sample, and the flattening is left in accordance with the standard.
A: Tested with distilled water
B: Tested in distilled water containing 10% alcohol.
3. Pinhole: In theory. Aluminum foil is a completely barrier material, but aluminum foil can cause pinholes due to its own defects, calendering process and dust in the air of the processing workshop, thus affecting its moisture resistance and gas barrier properties. Therefore, the barrier property of the aluminum foil depends on the size of the pinhole per unit area, and the pinhole is an important indicator of the quality of the aluminum foil.
The above is the technique introduced for you. It should be noted that Mingtai Aluminum is a famous manufacturer of aluminum foil and foil in China. The
foil paper for food packaging and
aluminum foil for pharmaceutical packaging have a good reputation both at home and abroad. Welcome to purchase our aluminum foil and other products.