Abstract: The carbon fiber preform mainly adopts the woven molding method for the large thickness and multi-layer variable structure. The principle and characteristics of the let-off system of carbon fiber preform weaving method are introduced. Based on the characteristics of the let-off system, the analysis of the warp let-off compensation amount in the continuous let-off process is carried out. In addition, different single yarn tension control devices for large-capacity dense layout are proposed based on the requirements of the woven equipment. In doing so, a new electronic single yarn tension control device is designed, and its electronically adjustable state is tested to meet the requirements of the weaving equipment and forming process, which has been undergone preliminary test verification.

Key words: carbon fiber; preform; large-capacity let-off; electronic; tension control