原丝加捻的目的是增加其紧密性，合股加捻的目的除了增加紧密性外，还可改变其卷装形式和线密度，以满足后加工和使用要求，瑞青丝绸从德国、意大利引进先进设备，生产出符合国外高端客户需要的捻线丝。

The primary objective is to increase the wire twisting tightness, twisting purpose in addition to close, also can change the package form and line density, in order to meet the requirements after the processing and use of green silk, Rui introduced advanced equipment from Germany, Italy, produced with foreign high-end customers with the need of twisted silk.