Cold-rolled steel coil winding temperatures typically range from 40 to 150°C. This heat is transferred to various components of the reel, and then conveyed to the surrounding space through convection and radiation. If the winding time is prolonged, causing the strip to cool and contract, the reel will heat up and expand. This results in increased radial pressure on the reel. By using a controllable expansion and contraction winding machine, adjusting the oil supply pressure to the expansion and contraction hydraulic cylinder during the winding process can maintain the reel's radial pressure at a certain constant value.

During the operation of the coiler, a common issue is the sliding between layers. This sliding results in surface scratches on the steel strip, particularly for strips with high surface quality requirements, such as stainless steel strips, which should be given special attention. Practice has shown that adjusting the oil supply pressure of the expansion and winding hydraulic cylinders can prevent the sudden drop in radial pressure after unwinding, thereby avoiding sliding between the layers of the steel strip during winding.

Most rolling machines currently use the same opening and winding tension, the same oil supply pressure for the opening and winding expansion cylinders, and also employ methods such as placing lining paper between the coils to prevent slippage.

Field tests have shown that significant variations in the non-roundness of the reel can lead to slippage between layers of the rolled product. Consequently, using a conical winding machine on the rolling mill is superior to a sector block winding machine. This is due to the smaller non-roundness error in the conical winding machine's reel.