Aluminum is used as a substrate, generally with an organic coating on both sides. This is necessary to facilitate the forming of the metal and/or to protect the metal against corrosion during the shelf life of the can or can end. It is often externally printed. Aluminum substrates are alloys. There are two major families of alloys depending on the main alloying element: magnesium or manganese. The rolling process is driven to obtain the required mechanical properties. It is for instance possible to obtain harder metal and thereby allowing reduced thickness. There is a surface treatment to increase adhesion of organic coatings.
Varnished aluminum strip coil
Varnished aluminum strip coil for aluminium easy open end lid top normally was made by 5052 H19 and 5182 H19 , which is normally use for making ring pull can lid, which is for beverage can, such as beer can, soft drinking can, soda can. Aluminum beverage can ends lids tops are made exclusively from clear lacquer aluminum strip coil. Beverage can ends lids tops are stamped from coils in a reciprocating press. After stamping, the ends are scored in an oval pattern and a tab is attached to form an "easy open" end. These steps are performed after the end piece has been coated and therefore damage the coating. Repair coatings are applied after these steps to restore the integrity of the coatings. Because they are flat, can ends must be thicker than bodies to resist pressure. Aluminum beverage cans are usually necked down to reduce the amount of material used to make a can by reducing the diameter of the ends.
After stamping, scoring, and tab attachment, the ends are transported to a curler which forms a trough or "curl" on the perimeter of the can end. A bead of a liquid polymer dispersion called an end seal compound is applied in the curl to create a hermetic seal when the end is attached to a can by the double seamer. Solvent-based end seal compounds are usually air dried and water-based compounds are dried in electric or gas-fired ovens at approximately 110 °F. The oven exhaust rate is about 300 scfm. The ovens can be part of a coating line or stand-alone installations, depending on the facility.
A. 5182 Varnished Aluminum Strip Coil for Ring Pull
Thickness: 0.25: 0.5mm; width: 1280mm; alloy temper: 5182 H19
1, Product Features
(1) Ring Pull stock generally adopts 5182 aluminum alloy processing, the Ring Pull Can Lid material generally use 5052 and 5182 aluminum alloys processed;
(2) flexible, stamping deformation is not easy to crack;
(3) small density, light weight, smooth surface, feel good; environmental protection is easy to recycle and reuse.
2. Production Control
(1) strict control of good width tolerance.
Thickness tolerance: + 0.01mm (preferably 0.005mm)
Width tolerance: + 1mm
Flatness requirements: height less than 3mm, within 1 meters of the wave number is less than 3;
(2). Mechanical properties:
Yield strength: 295-380Mpa;
Tensile strength: 355-420 Mpa;
Extension rate: 5.5%;
After baking: yield strength: 320MPa; tensile strength: more than 360MPa; the elongation rate: = 5.5%
(3). plate shape control:
Combined with roll, bending roll, spray the use of control good flatness, ensure hot machine convex degree control between 0.1 ~ 0.8%, hot online visual without obvious wave.
(4). appearance quality:
No end edge crack, roll end neat, no staggered pyramid.
B. 5052 Varnished Aluminum Strip Coil for ring pull can lid :
thickness: 0.22 - 0.5mm; width: 1280mm; 5052 H19 alloy
1, Product Features
(1) Ring Pull stock generally adopts 5182 aluminum alloy processing, the Ring Pull Can Lid material generally use 5052 aluminum alloys processed;
(2) flexible, stamping deformation is not easy to crack;
(3) small density, light weight, smooth surface, feel good;
(4) environmental protection is easy to recycle and reuse.
2. Production Control
(1) strict control of good width tolerance.
Thickness tolerance: + 0.01mm (preferably 0.005mm)
Width tolerance: + 1mm
Flatness requirements: height less than 3mm, within 1 meters of the wave number is less than 3;
(2). Mechanical properties:
Yield strength: 295-380Mpa;
Tensile strength: 355-420 Mpa;
Extension rate: 5.5%;
After baking: yield strength: 320MPa; tensile strength: more than 360MPa; the elongation rate: = 5.5%
(3). plate shape control:
Combined with roll, bending roll, spray the use of control good flatness, ensure hot machine convex degree control between 0.1 ~ 0.8%, hot online visual without obvious wave.
(4). appearance quality:
No end edge crack, roll end neat, no staggered pyramid.
Varnished Aluminum sheet for aluminium easy open end lid top
Varnished aluminum sheet for aluminium easy open end lid top also used in food can, such as milk powder can, food can etc.
Aluminium easy open end lid top for food cans are typically coated on aluminum sheets rather than coils. Varnished aluminum sheet for aluminium easy open end lid top coatings are applied by direct-roll coaters similar to those used in sheet coating operations for 3-piece can bodies, and some facilities use the same coating lines to coat can bodies and ends. Because both the interior and exterior surfaces are usually coated, each sheet is subjected to two separate application and drying steps. If UV-cured exterior coatings are used, these coatings are applied first. The UV coating is set by passing the sheets under a bank of UV drying lamps. Clear lacquer Aluminum sheets are then collected and turned over by wickets in preparation for the interior coating application, which is applied by a direct-roll coater. The sheets then pass through a drying oven to cure the interior coatings and complete the cure of the exterior UV-cured coating. Can ends are then formed in processes similar to those used to produce aluminum beverage can ends. The end seal compound application step is also similar to that used in aluminum beverage can manufacturing.
Sheet-coated easy-open can ends require additional fabrication steps such as when the
metal is scored and when a tab is attached. These steps are performed after the end piece has been coated and therefore damage the coating. Repair coatings are applied after these steps to restore the integrity of the coatings
Nowadays varnished aluminum strip sheet for food EOE end lid is normally use 8011 H16/H14 to make it, lacquered by epoxy clear varnish, or lacquered in different colors, normally in yellow color, golden color.
Varnished Aluminum sheet Specification:
8011 H16/H14 Thickness 0.20--0.30mm, Width: 800mm ---1000mm
Length: 800-1000mm
Packing: Wooden case, wooden pallet if request.
Varnished Aluminum sheet Coating: 1. Both sides clear epoxy varnish 2. One side clear epoxy varnish, the other side color coated.
Varnished Aluminum sheet Coating thickness:
Golden color /yellow color: both sides coating 5-6g/m2, one side coating 2-3g/m2.
White/red/black/blue color: Both sides coating 10-13g/m2.
Varnished Aluminum sheet Coating quality:
1. Boiling Resistant: Boiling 121 degrees for half an hour, the paint does not fall off, do not change color.
2. Resistance to acetone and mercuric chloride: repeatedly wiping 20 times without significant stripping
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