IPC 2013 : D02J 3/08 : by compressing, e.g. by calendering or ironing.

IPC2013 > D > D02 > D02J > D02J 3/00 > D02J 3/08[2] > by compressing, e.g. by calendering or ironing.
Notes[t] D01 - D07: TEXTILES OR FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
D SECTION D — TEXTILES; PAPER.
D02 YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING.
D02J FINISHING OR DRESSING OF FILAMENTS, YARNS, THREADS, CORDS, ROPES, OR THE LIKE (curling or crimping D02G; by treatment with liquids, gases or vapours D06B; finishing other than by liquid treatment, of yarns in warp or sheet form D06C; for chemical matters, see D06L, D06M, D06P, D06Q; treatment during rope-making, apparatus for treating ropes auxiliary to rope-making D07B).
D02J 3/00 Modifying the surface.
D02J 3/08 · · by compressing, e.g. by calendering or ironing.