A metal member according to the present invention is a metal member having a surface in contact with a rubber material, wherein at least a portion of the surface of the metal member in contact with the rubber material is formed from an alloy containing cobalt and chromium, and the metal member comprises a fluid passage for adjusting a temperature of the at least a portion of the surface of the metal member in contact with the rubber material.

A method for preparing direct melt-spun high-viscosity PBAT/low-viscosity PET two-component elastic fiber and a high-viscosity PBAT polymerization reactor. This method uses two production lines respectively used to produce a high-viscosity PBT melt and a low-viscosity PET melt, which are then spun. The high-viscosity PBAT production line comprises a first esterification reactor, a second esterification reactor, a first prepolymerization reactor, a second prepolymerization reactor, and a high-viscosity PBAT polymerization reactor. The polymerization reactor is designed with a special disc structure in a parallel two-shaft disc reactor, and the two shafts are rotated in opposite directions, improving the devolatilization effect and self-cleaning, significantly increasing the viscosity. By using this method, the cost is low and the production capacity is high, the process flow is shortened, the fiber strength can reach 2.552.85 cN/dtex, the crimp shrinkage rate can reach 25%60%, and the crimp stability can reach 58%70%.