IPC 2013 : D06F 51/02 : by twisting.

IPC2013 > D > D06 > D06F > D06F 51/00 > D06F 51/02[1] > by twisting.
Notes[t] D01 - D07: TEXTILES OR FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
D SECTION D — TEXTILES; PAPER.
D06 TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR.
D06F LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES (apparatus for blocking, pressing, steaming, or stretching hats A42C; treating textile materials by liquids, gases or vapors D06B; chemical matters, see D06L, D06M).
D06F 51/00 Apparatus for expelling or draining water from the linen, not provided for in groups D06F 45/00 - D06F 49/00.
D06F 51/02 · by twisting.