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The DWI (drawn and wall ironed) canmaking process is highly demanding and requires perfect packaging steels. The steel must be free of any detrimental inclusions which can cause short cans and split flanges. Consistent mechanical properties must be utilised during the steel production process to ensure drawability (yield stress, r-Lankford coefficient) and low-earring (anisotropy). Lastly, the thickness of the steel strip must be tightly controlled to ensure a smooth and efficient manufacturing process, and expected can performance.
The exact pressure resistance of a DWI beverage can (dome reversal pressure and dome growth) comes from a combination of the packaging steel’s thickness and hardness. However, if ironing and necking steps are required, softer grades must be used.
The packaging steel must have a high level of cleanliness.
Metallic coating: Tin coating (ECCS is not suitable for ironing) which is not re-melted and does not have passivation. A differential tin coating with a higher tin coating rate outside the can is recommended for the ironing step.