Spinning process of polypropylene staple fiber: What should be paid attention to on roving and spun yarn?

The draft ratio of polypropylene staple fiber in the rear area of the roving spun yarn is the same as that of the draw frame, and it should be appropriately enlarged to reduce the draft force and adapt it to the holding force, thereby improving the level of the sliver.

Compared with 1.67 polypropylene, the twist factor of the roving spun yarn should be appropriately reduced and reduced. The roving is controlled at about 10% of the 8%-10% spun yarn. The twist of the roving and the spun yarn is appropriately reduced to avoid the phenomenon that the spun yarn is not stretched out and a "hard end" is produced, and the production efficiency and output of the spun yarn are improved. Another is that the roving weight is light and the strength is low. The diameter of the roving package can be appropriately reduced to reduce the tension during unwinding and prevent accidental drafting.

The spun yarn adopts measures such as low-speed light travellers to reduce spinning tension and tension fluctuations and reduce end breaks. The drafting multiple of the spun yarn should be enlarged as much as possible. Fully exerting the drafting capacity of the spinning machine can reduce the design weight of the roving to not be too light. Roving spinning is difficult for smooth production.

Haian Qinfeng Chemical Fiber Co., Ltd. specializes in the production and sales of polypropylene staple fiber, PP staple fiber, polyester staple fiber, functional polypropylene staple fiber, functional polyester staple fiber, and hydrophilic polyester staple fiber. Our company mainly produces polypropylene staple fiber and polyester staple fiber: specifications 1.5D to 200D, length 5-150mm, product color sky blue, red, yellow, black, etc., can be customized. Polypropylene staple fiber and polyester staple fiber are rich in variety, support color to map or sample customization, fully meet your individual needs.

If you want to know more product information, please contact: Mr. Qian 13962787918, 13813743991 Website: http://www.glory-fiber.com/