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Closure sheet, which is used in the manufacture of screw cap systems for bottles and other containers, is one of the main products in the aluminium packaging market.Aluminium’s property of being impermeable to gases and light, as well as the fact that it can be easily formed and decorated, make it a material of choice for closure applications.
Dos lubricated aluminum sheet is used for the bottle cap market. Using a unique rolling technology, Haomei supplies aluminium sheets ideally suited to manufacture the caps for long neck wine bottles, extremely deep drawn and decorated closures, plus a range of pilfer proof caps for beverage bottles, soft drink, juice, isotonic beverage, energy beverage, and other products, such as the 30x60 mm specifications are often used in the wine and spirits segment.
Features of Dos oil coated Aluminum Sheet: Lightweight, easy and economical to recycle, excellent barrier properties, good formability provides a glossy finish for decoration.
The main function of DOS oil coated treatment is to prevent oxidation and scratches. Corrosion resistance of DOS lubricated aluminum cover plate and bonding force with coating. Aluminum plate for bottle cap material has excellent moisture resistance, light shading and high barrier properties, strong mechanical properties, high blast resistance, strong puncture resistance and tear resistance.
Aluminum bottle caps are usually processed on production lines with a high degree of automation, so there are strict requirements on the strength, elongation and dimensional deviation of the material, otherwise breaks or creases will occur during the processing.
- Material requirements: Aluminum cover sealing sheet
- Material surface: smooth, no roll marks, scratches or stains.
- Alloy:8011-H14 bottle cap material, 3003-H16 bottle cap material, etc.
- Specifications: thickness 0.20mm-0.23mm, width 449mm-796mm.
- Production method: Aluminum bottle cap materials can be produced by hot rolling or continuous casting and rolling, and then cold rolling. At present, the multi-purpose continuous casting and rolling billet is better than the casting and rolling billet of the national ROPP cover material production plant.
Surface types of aluminum closure sheets:
- 1.Ordinary calendered aluminum strip;
- 2.DOS oil lubricated surface treatment;
- 3.Chrome plated surface;
- 4.One side is gold/white/red/blue/black and other colors, and the other side is protective paint;
- 5.Both sides are coated with varnish/transparent paint;
Aluminium closure sheet printing process
Foundation processing(Known as a “size coat,” foundation processing is conducted to help the paint adhere better. Products that are processed using phosphoric acid chromate or zirconium are often cut.)
Exterior (interior) paint Either the public side or the product side surface may be painted first, depending on the product.
Exterior printing (The number of printing passes depends on the image to be printed on the cap).-Topcoat varnish Glossy varnish
Cutting (A single slitter method is used to cut the sheet into three equal strips. For some products, both edges are trimmed at this time).
Aluminium closure sheet pressing process
First pressing
The cut printing plate is run through the press to create the cap shape (straight side walls).
Second pressing
The bottom edge of the formed cap is trimmed off (broken off) or curled.
Attaching the liner to the inner surface
Adhesive joining
Knurl forming
Protrusions are formed on the sides of the cap, near the top, to prevent slippage when twisting the lid open.
Perforations
Perforations are added to ensure that when the lid is twisted open, the TE band (ring) remains behind.
Fig. 1st Pressing
1st Pressing
Leave a hat-like shape at the base of the pressing.
Fig. 2nd Pressing
2nd Pressing
At the same time as the first pressing, the hat-shaped edge is trimmed away.
Fig. Knurling
Knurling
Knurls are added as the cap rotates.
Fig. Perforation Perforation
Technical Parameters
Technical Parameters
| Alloy | Temper | Thickness | Width | Rolling process | Surface treatment | Application | Delivery date | Package | Sample |
| 1060, 3003, 3105, 5052, 8011 | H18, H19, H22, H24, H26,H14,H16 | 0.15-0.5mm | 500~2500mm | CC/DC | Aluminum surface treated with phosphochromate and dos | Bottle caps, aluminum liquid caps, red wine caps, anti-theft caps, perfume caps, skin care caps, cosmetic caps, oil caps, aluminum-plastic composite caps for oral liquid, aluminum-plastic caps for infusion bottles, etc. | 20~25 days | Mutton | Able to provide |
Chemical composition Wt (%)
| Alloy | Si | Fe | Cu | Mn | Mg | Zn | Ti | Other | Al |
| A1060 | ≤0.25 | ≤0.35 | ≤0.05 | ≤0.03 | ≤0.03 | ≤0.05 | ≤0.03 | 0.03 | Remainer |
| A3003 | ≤0.6 | ≤0.4 | 0.05~0.2 | 1.0~1.5 | - | ≤0.10 | ≤0.10 | ≤0.15 | Remainer |
| A3105 | ≤0.6 | ≤0.7 | ≤0.3 | 0.3~0.8 | 0.2~0.8 | ≤0.40 | ≤0.10 | ≤0.15 | Remainer |
| A5052 | ≤0.25 | ≤0.4 | ≤0.1 | ≤0.1 | 2.2~2.8 | 0.1 | - | ≤0.15 | Remainer |
Mechanical Properties
| Alloy | Temper | Thickness(mm) | Tensile strength(Rm/Mpa) | Elongation (%) | Ear rate (%) |
| 1060 | O | 0.15~0.5 | 55~95 | 15 | 6 |
| 1060 | H22 | 0.4~0.5 | 75~110 | 6 | 5 |
| 8011 | H14 | 0.15~0.5 | 125~165 | 2 | 3 |
| 8011 | H16 | 0.15~0.5 | 130~165 | 1 | 3 |
| 8011 | H18 | 0.2~0.5 | ≥165 | 1 | 3 |
| 3003 | H14,H24 | 0.2~0.5 | 145~185 | 2 | 4 |
| 3003 | H16,H26 | 0.2~0.5 | 170~210 | 1 | 4 |
| 3003 | H18 | 0.15~0.5 | ≥185 | 1 | 4 |
| 3105 | H14,H24 | 0.2~0.5 | 150~200 | 2 | 4 |
| 3105 | H16,H26 | 0.2~0.5 | 175~225 | 1 | 4 |
| 3105 | H18 | 0.2~0.5 | ≥195 | 1 | 4 |
| 5052 | H18 | 0.2~0.5 | 280~320 | 3 | 4 |
| 5052 | H19 | 0.2~0.5 | ≥285 | 2 | 4 |
