The application of wax to a warp sheet so as to improve its weaving performance. The wax, in emulsion or molten form, is usually applied by a trough and lick roller. The point of application may be between the swift and warp beam in section warping , or between the creel and beaming head in beam warping or immediately after drying in slasher sizing. Normally waxes must be readily removable in the subsequent finishing operation.
Note: Alternatively wax is sometimes applied to a warp by means of a wax rod placed in the nip between the warp sheet and the weaver’s beam at the point where the yarn leaves the latter.
Textile Resource (http://www.textile.org.uk)