Problems in the production of polyester spun yarn and their solutions

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With the growth of market demand for chemical fiber, polyester production and sales are also increasing, and occupy a large proportion. At present, cotton-type equipment is mostly used in spinning production to process chemical fiber yarn, and there are still many problems in the spinning process.


Polyester fiber is a macromolecular polymer with high crystallinity, poor moisture absorption capacity, easy to generate static electricity, and difficult to dye. Due to various factors in the processing process, it is easy to cause bundle yarn, parallel yarn, hard yarn, rubber block, super long, and double Long fiber, during the spinning process, it is easy to cause uneven yarn evenness, undrafting, small braid yarn, rubber yarn, etc.; if the oil agent is not selected properly, it is easy to generate static electricity, causing sticking, entanglement, and card clothing. Stuffing, blockage of drawing bell mouth, entanglement of roller top roller, etc. The factors that cause the super-long and double-length of the polyester fiber are:

(1) Uneven tension during bundling;
(2) The stretching ratio is too high during the stretching process and the stretching speed is improper;
(3) The tension is uneven during cutting, the knife edge is not sharp, etc.

In the spinning process, taking appropriate measures to address the above problems can improve product quality and labor productivity.

1. Reasonable collocation of raw materials
According to the spinning requirements, the use of reasonable raw material collocation and the mixing and collocation of chemical fibers from different origins and batches are conducive to the smooth progress of spinning, which not only improves the fiber cohesion, but also reduces the adhesion phenomenon in the spinning process. On the other hand, it can fully reflect the excellent characteristics and good appearance characteristics of chemical fiber fabrics.

2. Choose a proper amount of polyester finish
The appropriate amount of oil agent is one of the methods to solve the adhesion and entanglement phenomenon in the production and processing process. However, there must be certain restrictions on the oil standard:

(1) Good hygroscopicity. Used to eliminate static electricity generated during chemical fiber processing.
(2) The adhesion is small. Otherwise, the phenomenon of tangling cylinders and licker rollers will be caused during carding, the bell mouth and the inclined tube of the guide bar in the drawing roving are not smooth, and the phenomenon of winding rollers and top rollers will occur in each process, which will affect the quality of the yarn.

3. Reasonable process configuration and good equipment condition
To shorten the process flow in the blow-out process, generally adopt a short process of two opening points and two cotton boxes, and the cotton conveying pipeline is as short as possible.

4. Treatment methods for the bulking and sticking phenomenon of cotton laps produced in the cleaning process
(1) A positively rotating concave-convex anti-adhesion roller is installed to press and engrave the impression on the cotton layer to prevent adhesion.
(2) A single dust cage is used to absorb cotton. Closing the lower dust cage can reduce the adhesion of the sticky layer and the single dust cage absorbs cotton. On both sides of the passage between the beater and the dust stick, right-angled triangle wooden blocks with a side length of 50mm and a 190mm outer iron sheet are added to solve the phenomenon of thick sides on both sides of the cotton layer.
(3) Increase the pressure of the pressing roller to make the fibers gather tightly.
(4) Shorten the lap length and increase the lap ration. The lap length should be 25~30mm, and the lap weight should be 350g/m.
(5) Use 5~7 rovings to clamp the outer layer of the flower roll.

5. Phenomena and solutions are easy to occur in the drawing process
The following phenomena are prone to occur in the drawing process: adhesion, white powder; winding rollers, winding rollers; sliver breaks, winding phenomenon when driving and parking; polyester blocking inclined pipes and bell mouths. The solution is as follows.

(1) Solve the adhesion problem. In addition to adding an appropriate amount of oil to the raw materials, the temperature and humidity of the workshop should also be controlled. The temperature is generally below 25℃, and the relative humidity is about 65%, which can eliminate electrostatic interference.
(2) Solve the problem of wrapping rollers and wrapping rollers. Adopt a nitrile rubber roller with a hardness of 80, and use it on the car after treatment with drugs. The surface of the rubber roller can also be carburized to eliminate static electricity to reduce the phenomenon of winding rollers and rollers.
(3) Solve the blockage of oblique pipe and bell mouth. The use of compressed bell mouth has better effect than ordinary bell mouth and can reduce clogging; appropriately increasing the tension draft between the pressure roller and the coil can also reduce the oblique pipe and the bell mouth clogging.

In terms of process configuration, the sliver quantitative should not be too heavy to prevent the sliver from breaking and entanglement.

The above are some of the problems and solutions in polyester spun yarn. For more information about polyester spun yarn, please contact us. We mainly provide a large number of polyester virgin spun yarn. It is available in Raw white polyester spun yarn and Dyed colors polyester spun yarn.

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