How to choose tonnage for hydraulic uncoiler?

Tonnage selection is the core parameter when ordering a hydraulic uncoiler, mainly determined by the maximum single coil weight customers process in daily production. First of all, calculate the actual coil weight: coil weight = coil density × coil cross-sectional area × coil outer diameter. Common low-capacity hydraulic uncoilers with 3T–5T load are suitable for thin PPGI, galvanized and stainless steel coils used in small stamping and light-gauge roof panel roll forming lines, which feature small outer diameter and lightweight raw materials.

Medium specification 6T–10T hydraulic uncoiler is the most popular standard model for C purlin, floor deck and wall panel roll forming manufacturers, matching conventional full-size steel coils from steel mills. For thick hot rolled coils, automotive steel and large aluminum coils, customers need 12T–20T heavy-duty hydraulic uncoiler, usually equipped with a matched hydraulic coil car to complete automatic loading.

To avoid overload damage, the selected rated tonnage should reserve 15%–20% safety margin above the maximum actual coil weight. Special oversized coils for slitting and cut-to-length lines need customized over-20T shaftless hydraulic uncoiler. Meanwhile, raw material thickness, inner diameter and outer diameter of steel strip will indirectly affect bearing capacity, which shall be fully considered before final tonnage confirmation.

1. GB/T 7714-2015

[1] Zhang Y. Tonnage Matching and Selection Principle of Hydraulic Uncoiler for Metal Coil Processing[J]. Metal Processing Machinery,2025,19(4):38-45.

2. APA 7th

Zhang, Y. (2025). Tonnage matching and selection principle of hydraulic uncoiler for metal coil processing. Metal Processing Machinery, 19(4), 38–45. 

3. MLA 9th

Zhang, Yang. "Tonnage Matching and Selection Principle of Hydraulic Uncoiler for Metal Coil Processing." Metal Processing Machinery, vol.19, no.4, 2025, pp.38-45