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Polypropylene high-strength yarn production line The current production line of polypropylene high-strength yarn is mainly one-step and two-step.
The one-step method includes short-range spinning and direct multi-section drafting. The two-step method includes horizontal bundling and vertical single-stretch drawing.
The main difference between the one-step method and the two-step method is that the one-step method is spinning the tow directly into the drafting system after the tow is oiled, and then winding on the bobbin: two-step spinning, tow After the oil is applied, it is wound into a bobbin and fed into the drafting system by a draft bobbin.
Both process routes have their own characteristics.
The advantage of the one-step method is that it saves intermediate equipment (winder and drafting creel), and the equipment has a small footprint and less labor. The final product index has fast feedback and low energy consumption. The advantage of the two-step method is that spinning and drafting are separated, and the two-step processing does not affect each other, which facilitates the adjustment of the process, especially when the raw materials and colors are changed. The wound yarn spool can be rotated for a period of time to relax the inside. The stress makes it easier to obtain a higher orientation, so that a high-strength, high-quality polypropylene high-strength yarn can be obtained; due to the low feed roller speed in the two-step drafting method, it is easy to increase the draft multiple and thus obtain a higher strength.