Analysis and measures of influencing factors on compact spinning production quality

Our company produces compact spinning varieties and uses a four-roller negative pressure compact spinning device. In order to explore the factors affecting the quality of compact yarn in the production of compact spinning varieties, the following tests, tracking and analysis were carried out. According to the production principle of negative pressure compact spinning, the drafted whiskers are in the position of the negative pressure accumulation groove formed by the mesh ring and the special-shaped tube, so that the fiber whiskers have a better aggregation state, thereby reducing yarn hairiness and improving yield. Yarn strength. If the fiber strands at the negative pressure accumulation groove are not dense enough or the fibers are loose, the yarn quality of the compact yarn will be affected to a certain extent. To determine the specific impact on yarn quality, we need to follow up and do the following detailed work. After inspection on the machine, it was found that the fiber whiskers at the position of the negative pressure accumulation tank were either loose, or swimming left and right, or wavy, or thick or thin, etc., and they were sampled, inspected, processed, tested, and wound. The influencing factors causing differences in compact yarn quality were found. If the pagoda yarn can be accepted by Ziluo, there will be differences in the quality of compact yarn between spindles, and may even cause quality complaints from customers; if it is not accepted by Ziluo, it will form waste yarn and cause waste. It is summarized below for reference.

The normal quality indicators of this compact yarn variety are: evenness CV% 12.45, kilometer details (-50%) 2, kilometer thick places (+50%) 10, kilometer neps (+200%) 18, Hairiness index H2.88.

Factors affecting the quality of compact spinning production are as follows:

1. There is serious accumulation of flowers on the mesh circle and tension rod

In the collection tank, the fiber strands are either loose or wavy.

The sampling test indicators of this ingot are as follows: evenness CV% 14.91, kilometer details (-50%) 5.0, kilometer thick place (+50%) 152.5, kilometer neps (+200%) 1562.5, hairiness index 2.67.

Analysis of test results: Evenness CV%, thousand-meter thick places, thousand-meter thick places, and thousand-meter neps all deteriorated to varying degrees. Among them, evenness CV%, thousand-meter thick places, and thousand-meter neps deteriorated seriously. Black slat dry: many neps.

Winding situation: The winding is not accepted, the electronic clearer shows C, short and thick defects.

Take measures: combine periodic cleaning and centralized cleaning to deal with accumulated waste.

2. The main drafting rubber roller is worn and grooved

In the gathering tank, the output fiber strands may be thick or thin, which may easily cause yarn breakage.

The sampling test indicators of the ingot are as follows: evenness CV% 25.47, kilometer details (-50%) 2270.0, kilometer thick place (+50%) 2045.0, kilometer neps (+200%) 52.5, hairiness index ,1.47.

Analysis of test results: Evenness CV%, thousand-meter details, thousand-meter thick places, and thousand-meter neps all deteriorated to varying degrees. Among them, evenness CV%, thousand-meter details, and thousand-meter thick places deteriorated seriously. Mechanical waves are shown on the spectrogram. The black slats have thick details, similar to the thicker and smaller bamboo style.

Winding situation: The winding is not accepted, the electronic clearer shows C, short and thick defects.

Take measures: Replace new rubber rollers or put newly sharpened rubber rollers on the machine.

3. Improper position of the output rubber roller

In the gathering tank, the output fiber whiskers are very loose, wavy, or snowflake-shaped. The grid circle is not flexible in rotation.

The sampling test indicators of the ingot are as follows: evenness CV% 15.43, kilometer details (-50%) 2.5, kilometer thick place (+50%) 200.0, kilometer neps (+200%) 3942.5, hairiness index 4.40.

Analysis of test results: Evenness CV%, thousand-meter thick places, and thousand-meter neps deteriorated seriously, and the hairiness H value deteriorated slightly. There is an abnormality in the spectrogram. Black slat dry: lots of neps.

Winding situation: The winding is not accepted, the electronic clearer shows C, short and thick defects.

Take measures: correct the position of the output rubber roller so that the jaws formed by the output rubber roller and the small roller drive the grid ring to operate flexibly.

4. The collecting tank is partially blocked

In the gathering tank, the output fiber strips are loosened at the blockage of the gathering tank.

The sampling test indicators of the ingot are as follows: evenness CV% 12.56, kilometer details (-50%) 0.0, kilometer thick place (+50%) 5.0, kilometer neps (+200%) 12.5, hairiness index 4.10.

Test result analysis: Evenness CV% and hairiness H value deteriorated slightly.

Winding status: Winding accepted.

5. The coating of the main drafting rubber roller is uneven

In the expression of the gathering tank: there is no obvious abnormality in the output fiber whiskers.

The sampling test indicators of this ingot are as follows: evenness CV% 13.61, kilometer details (-50%) 2.5, kilometer thick place (+50%) 35.0, kilometer neps (+200%) 22.5, hairiness index 1.63.

Analysis of test results: CV% of backbone, deterioration of thousand-meter thick places, and mechanical waves on the spectrum.

Winding status: Winding accepted.

Take measures: When handling the gathering rubber roller, it is required to handle it evenly. Replace the gathering rubber roller with a intact one.

6. The interface between the negative pressure pipe and the special-shaped pipe is blocked

In the aggregation tank, the output fibers are loose and have poor aggregation.

The sampling test indicators of the ingot are as follows: evenness CV% 12.57, kilometer details (-50%) 0, kilometer thick place (+50%) 12.5, kilometer neps (+200%) 17.5, hairiness index 7.50.

Test result analysis: Evenness CV% has deteriorated slightly, and hairiness H value has deteriorated seriously.

Winding status: Winding accepted.

Take measures: clear the clogged area in time.

7. The collection tank is completely blocked

In the aggregation tank, the output fibers are loose and have poor aggregation.

The sampling test indicators of the ingot are as follows: evenness CV% 13.36, kilometer details (-50%) 35, kilometer thick place (+50%) 25, kilometer neps (+200%) 30, hairiness index 9.03.

Analysis of test results: Evenness CV%, kilometers of details, kilometers of thick places, kilometers of neps, and hairiness H values ​​all deteriorated to varying degrees, among which the hairiness H value deteriorated very seriously.

Winding status: Winding accepted.

Take measures: clear the clogged area in time.

The collection tank is completely blocked

8. The bell mouth is not correct

In the expression of the gathering tank: the output fiber strips swim left and right in the position of the gathering tank, sometimes being gathered and sometimes not being gathered.

The sampling test indicators of this ingot are as follows: evenness CV% 13.56, kilometer details (-50%) 0, kilometer thick place (+50%) 60, kilometer neps (+200%) 260, hairiness index 4.50.

Analysis of test results: Evenness CV%, thousand-meter thick places, thousand-meter neps, and hairiness H values ​​all deteriorated to varying degrees, among which the thousand-meter neps deteriorated seriously. Black slat dry: more neps.

Winding status: Winding accepted.

Action to take: Correct the flare.

The trumpet mouth is not correct

Conclusion:

Through inspection findings, sampling tests, result analysis, winding conditions, measures taken, etc., a total of 8 factors affecting the quality of compact yarn were summarized. Among them, there are three situations: serious accumulation of flowers on the grid ring and tension rod, grooves caused by wear and tear of the main drafting rubber roller, and improper position of the output rubber roller. Ziluo will not accept it., it can only be disposed of as waste yarn, forming yarn waste and causing waste. Five conditions, including partial blockage of the gathering trough, uneven coating of the main drafting rubber roller, blockage at the interface between the negative pressure tube and the special-shaped tube, total blockage of the gathering trough, and incorrect bell mouth, will cause differences in the quality of compact yarn between spindles to varying degrees. In the production of compact yarn, inspections should be strengthened to detect and deal with them in time. A common phenomenon during inspection is to check the condition of the fiber whiskers in the gathering tank one spindle at a time to see if it is normal. Only when the fiber whiskers are in a good gathering state at the edge of the gathering groove and are approximately straight lines can it be considered normal. If there is an abnormality, find the cause in time and deal with it in time to prevent the occurrence of defective yarn and yarn with different quality.