(2) After being wound with self fusible tape, it is wound in 1 / 2 overlapping mode, and the self fusion is realized within 24 hours at normal temperature. After winding, each layer is fused into one layer, and the process is irreversible. It fits tightly with the wound part. Due to its good adhesion, it can fit tightly even in irregular bending parts without edge warping, so as to realize the sealing function;