Beam for weaving and sizing method

摘要

To provide a method for sizing polytrimethylene terephthalate fiber yarns and a warp beam improved in mutual stickiness of the yarns and excellent in weavability. The sizing method according to the present invention is characterized in that the yarns are dried while controlling a stretch ratio S (%) between a squeeze roll and a drying cylinder in a range from -9 to -3% or from -1 to +4%. From the sized yarns thus obtained, a warp beam is formed at a winding tension in a range from 0.09 to 0.22 cN/dtex to have hardness in a range from 65 to 90 degrees.