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Tin plated steel strip arrives as a coil, yet the can maker does not feed the whole coil at once. Consequently, the coil must unwind cleanly without telescoping, scratches, or edge damage. The coiling process at the mill sets the foundation for every downstream step. Here are the parameters that matter.

Parameter 1: Winding Tension

Too much tension and the coil telescopes (layers slide sideways). Too little and it loosens in transit. Consequently, mills control tension across the width. Furthermore, edge tension is slightly lower to avoid wrinkling. For 0.20 mm tinplate, typical winding tension is 30–50 N/mm strip width.

Parameter 2: Inner Diameter

Coil inner diameter (ID) must match the customer’s mandrel. Common IDs:

• 406 mm (16 inch): standard for can makers.
• 508 mm (20 inch): for large slitting lines.
• 200–300 mm: for narrow slitting to strip.

Consequently, specify the ID when ordering. A coil on the wrong ID does not fit your line.

Parameter 3: Slit Width Tolerance

Can makers slit wide coil into narrow strip for can bodies and ends. Consequently, width tolerance matters: ±0.05 mm for can stock. Furthermore, the slit edge must be burr-free. A burr catches on the die and causes scratches.

Parameter 4: Coil Weight

Coil weight affects line efficiency. Too heavy and the crane cannot handle it. Too light and you change coils often. Consequently, standard can-maker coils weigh 5–15 tons. Furthermore, smaller orders ship as cut sheets instead of coils.

Parameter 5: Eye Direction

Coils wind “eye to the sky” or “eye to the side.” Consequently, specify the eye direction on your PO. Furthermore, mark the outside wrap with grade, weight, and heat number.

Related Strip Products We Slit

We slit other strip materials to customer width:

• C26800 / H65 Brass Strip for terminals and springs, slit to ±0.05 mm.
• C11000 / T2 Copper Plate in slit strip for busbar applications.
• Non-oriented silicon steel coil in slit strip for motor laminations.

Specify Your Coil Requirements

A complete order reads: “T3, 0.20 mm × 800 mm, 2.8/2.8 g/m², ID 406 mm, eye-to-sky, 10 tons per coil, mill edge.” Leave out the ID and eye direction and the mill ships its standard.

Get Coiled Strip to Spec

Tell us your line mandrel diameter and required slit width. We will confirm coil dimensions and quote.

• Email: vera.liang@ztwysteel.com
• Location: Xishan District, Wuxi, Jiangsu, China
• Supply range: tinplate coil, brass strip, copper strip, silicon steel coil
• Slitting tolerance: ±0.05 mm on narrow strip
• Documentation: MTC with temper, tin weight, width, ID, and coil weight

We reply within one working day.