Aluminium sheet for pilproof caps 3105 belongs to the 3000 series aluminum-manganese alloy, it has good rust resistance and good deep-drawing effect. The strength, elongation and processing performance of the 3105 aluminum closure sheet material can meet the production process of automatic high-strength bottle caps, and there will be no creases or cracking phenomenon during processing. In addition, the 3105 aluminum sheet for pp cap material has a flat shape, no roll marks, and no oil spots, which is convenient for later printing and makes the pattern clear and recognizable.
The producing characteristics of 3105 and 8011 aluminium sheet for pilproof caps are:
1, During smelting, casting and rolling, optimize the composition content of aluminum alloy in a small range: make the weight component content of Si account for 0.5-0.58% of the total weight of the alloy, and the weight component content of Fe account for the 0.6-0.68% of the total weight of the alloy, and the weight component content of Ti accounts for 0.015-0.025% of the total weight of the alloy; at the same time, the weight component content of the Mn, Mg, and Cu trace elements respectively account for the total weight of the alloy ≤0.03%.
2, During cold rolling, the above aluminum cast-rolled billet is cold-rolled in 9-10 passes on the cold rolling mill. The first four passes are rolled with a reduction of 10-25% of the thickness. The finished product The last pass is rolled with a reduction of 10-25% of the thickness, and the middle 45 passes are rolled with a reduction of 30-40% of the thickness. The final aluminum sheet for pp caps product thickness is 0.19-0.21mm.
3, Annealing During the production process of cold-rolled billets, two intermediate annealings are performed: the first selected high-temperature homogenization annealing with a thickness of 2.0-2.5mm, the annealing temperature is 530-550 degrees, and the constant temperature time is 16- Out of the furnace after 20 hours; the second intermediate annealing with a thickness of 0.4-0.6mm is selected, the annealing temperature is 430-450 degrees, and the rapid annealing method is adopted in which the empty furnace is heated to the set temperature and then the furnace is heated. The constant temperature time is After 10-12 hours, the furnace will be shut down and kept for 1 hour before being released. Finally, it will be cold rolled to the required thickness of the aluminium sheet for pilproof caps product.