Adopting high-quality engineering plastics ABS, PP and other composite materials refined, large digital injection molding machine processing production, so that the roving tube product density is higher. Surface lines and the unique design of the raw head flannel, a complete solution to the textile mill coarse “accidental elongation” problem, to ensure uniformity of the roving stem, in the supporting speed of 1800r/min with the host computer, the overall amplitude of the roving tube is not more than 0.3mm, relative to the bottom of the plane of the perpendicularity is not more than 1.0mmm, and the wing spindle rod with the use of high-quality plastics wear-resistant lubrication materials, effective protection of spindle rod and the spindle tube wear. Yarn tube wear.