two-tie unit weaves

unit weaves with two tie-down ends that 'tie' a supplementary pattern weft float to a ground cloth (plain weave, twill, or satin). The other ends in the unit are often called pattern ends since they determine whether the float appears on the face or the back of the cloth. All of the ends in the unit weave the ground cloth. (The structural unit  must contain the complete threading sequence of the tie-down ends. The block, determined by the threading of the pattern shafts, can be smaller than the unit; see Bergman.) Two-tie unit weaves differ in: a) the ratio of tie-down ends to pattern ends, b) the number of threads in the unit, c) the number of pattern shafts required for each block, d) the location of the tie-down ends in the unit, e) and the order in which the tie-down ends are lifted to tie the supplementary weft float.