In most cases, when materials are formed, a continuous material flow is required, and system downtime is not desirable, whether from an economic or a technical standpoint. To eliminate this interruption during material or coil changeover, material accumulators are implemented to guarantee continuous operation. Plant lines with decoilers, joining stations, straighteners and material accumulators complete the feeding process. For the production of bar material and rods, straighteners and/or feed units can be put in place. Adding cut-to-length units and decoilers completes the production line.