十年前, 世界杯足球买球 launched a revolutionary winding equipment that would significantly increase capacity. 第一个被送到了 Propapier. 在第一次启动之后, over 50 双重放松 solutions have been sold already to increase winding capacity. 双重放松ing makes it possible to get rid of additional reel spool storages at the winder. There is no need to pause the production due to parent roll change as earlier. 双Unwind序列是完全优化的，独立于起重机.
With conventional parent roll change solutions, fast manual changes are 5-6 minutes. However, typical measured 父卷更改时间s in the industry are on average some 9-12 minutes. With this in mind, a one-minute parent roll change with 双重放松 is very fast. 仅这一点就可以节省大量的资金，增加了卷取机的产能. 根据绕线机的不同，容量的增加可以是可观的.
The movements of parent rolls are arranged to happen simultaneously with the set changes, which is a robust solution to ensure there are no compromises to the roll structure and quality during winding. The second unwind stand is designed only for unwinding the last set from the parent roll. This allows the primary unwind stand to receive a new, prepared parent roll during winding.
双unwind可以通过两种不同的拼接技术来实现, 传统的飞行拼接或对接拼接, BJS, 哪一个会准备一个可出售的拼接.