Detection method for single-spindle-position tow tension force in Lyocell spinning production and abnormal spindle position screening method

Abstract

The invention belongs to the field of spinning, and particularly relates to a method for detecting tension of single-spindle-position tows produced through Lyocell spinning and a method for screening abnormal spindle positions. The detection method provided by the invention comprises the following steps: S1) preparing a tensile force detection device; s2) fixing a base of the tension detection device on the upper edge of a spinning bath at a certain spindle position of the Lyocell spinning machine; s3) calibrating the position of the base through a base position calibration unit of the tensile force detection device; s4) sleeving a tow limiting ring of the tension detection device on the tow; and S5) stretching a tensile force detection unit of the tensile force detection device to a specified position, and reading a reading to obtain a tensile force detection result of the tow. The detection method provided by the invention fills the blank of single-spindle-position tow tensile force testing of the Lyocell spinning machine, can be used for detecting the spinning state, can check abnormal spindle positions under the condition of no shutdown, and improves the spinning quality.

Description

Technical Field

[0001] The invention belongs to the field of spinning, and in particular relates to a method for detecting the tension of a single spindle position filament bundle in Lyocell spinning production and a method for screening abnormal spindle positions. Background Art

[0002] With the increase of Lyocell fiber production capacity and the development of various downstream customers, the application of Lyocell fiber is becoming more and more extensive, from coarse denier products to fine denier products, from spinning to non-woven products; while paying attention to product performance, customers and the market are shifting more attention to product quality. Spinning defects have a great impact on spinning efficiency and finished product quality. Reducing or even eliminating spinning defects is one of the goals that major manufacturers strive for.

[0003] Improving the stability of the spinning process is the most important means to reduce spinning defects. The use of tow tension as an indicator to evaluate the speed of tow formation has been proven to be feasible after many practical tests. If the tension of each spindle can be accurately tested, it can be used to evaluate the speed of tow formation in order to guide the direction of process adjustment, and to find the spindles in abnormal state through comparative analysis to make targeted adjustments. However, due to the later development of lyocell than other chemical fibers, the spinning methods are also very different, and the major manufacturers lack technical exchanges, resulting in no method for testing the tension of a single spindle of a Lyocell spinning machine until now. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a method for detecting the tension of a single-spindle yarn in Lyocell spinning production and a method for screening abnormal spindle positions. The detection method provided by the present invention fills the gap in the single-spindle tension test of the Lyocell spinning machine, and can be used for detecting the spinning state and discovering abnormal spindle positions, thereby improving the spinning quality.

[0005] The present invention provides a method for detecting the tension force of a single spindle yarn in Lyocell spinning production, comprising the following steps:

[0006] S1) preparing a tension force detection device, the tension force detection device comprising: a tow limit ring; a tension force detection unit, the tension force detection unit being connected to the tow limit ring; a base with a guide rail, the tension force detection unit being located on the base and being able to slide up and down along the guide rail of the base; a base position calibration unit for calibrating the position of the base;

[0007] S2) fixing the base of the tension force detection device on the upper edge of the spinning bath tank of a spindle position of the Lyocell spinning machine;

[0008] S3) calibrating the base position by a base position calibration unit of the tension force detection device;

[0009] S4) putting the tow limiting ring of the tension force detection device on the tow;

[0010] S5) stretching the tension detection unit of the tension detection device to a specified position, and reading the indication to obtain the tension detection result of the tow.

[0011] Preferably, in step S2), the Lyocell spinning machine is a Lyocell spinning machine with a rectangular spinneret.

[0012] Preferably, the detection method further comprises: repeating step S5) multiple times and taking an average value.

[0013] The present invention provides a method for screening abnormal spindle positions in Lyocell spinning production, comprising the following steps:

[0014] The yarn tension of different spindle positions of the Lyocell spinning machine is detected according to the detection method described in the above technical solution, and the spindle position with abnormal tension is found by comparing the test results.

[0015] Preferably, the abnormal spindle position screening method further comprises: repairing the spindle position with abnormal tensioning force.

[0016] Compared with the prior art, the present invention provides a method for detecting the tension of a single spindle position of a Lyocell spinning machine and a method for screening abnormal spindle positions. The detection method provided by the present invention includes the following steps: S1) preparing a tension detection device, the tension detection device including: a tow limit ring; a tension detection unit, the tension detection unit being connected to the tow limit ring; a base with a guide rail, the tension detection unit being located on the base and being able to slide up and down along the guide rail of the base; a base position calibration unit for calibrating the base position; S2) fixing the base of the tension detection device on the upper edge of the spinning bath tank of a spindle position of a Lyocell spinning machine; S3) calibrating the base position by the base position calibration unit of the tension detection device; S4) putting the tow limit ring of the tension detection device on the tow; S5) stretching the tension detection unit of the tension detection device to a specified position, and reading the indication to obtain the tension detection result of the tow. The detection method provided by the present invention fills the gap in the tension test of a single spindle position of a Lyocell spinning machine, can be used for the detection of the spinning state, can check abnormal spindle positions without stopping the machine, and improve the spinning quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 is a structural schematic diagram of a tension force detection device provided by an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of detecting the tension force of a single-spindle yarn bundle of a Lyocell spinning machine provided by an embodiment of the present invention.

[0020] Explanation of the reference numerals: 1 is a yarn bundle limiting ring, 2 is a tensioning force detection unit, 3 is a base with a guide rail, 4 is a base position calibration unit, 5 is a spinneret, 6 is a single yarn, 7 is a transverse wire guide rod, 8 is a vertical total wire guide rod, 9 is a vertical wire guide rod, 10 is an initial position of the yarn bundle, and 11 is an end position of the yarn bundle stretching. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The present invention provides a method for detecting the tension force of a single spindle yarn in Lyocell spinning production, comprising the following steps:

[0023] S1) prepare a tension force detection device, the structure of which is as follows Figure 1 As shown, it includes: a tow limit ring 1; a tension force detection unit 2, which is connected to the tow limit ring 1; a base 3 with a guide rail, the tension force detection unit 2 is located on the base 3 and can slide up and down along the guide rail of the base 3; a base position calibration unit 4 for calibrating the position of the base;

[0024] S2) fixing the base 3 of the tension force detection device on the upper edge of the spinning bath tank of a spindle position of the Lyocell spinning machine;

[0025] S3) calibrating the position of the base 3 by the base position calibration unit 4 of the tension force detection device;

[0026] S4) putting the tow limiting ring 1 of the tension force detection device on the tow;

[0027] S5) stretching the tension detection unit 2 of the tension detection device to a specified position, and reading the indication to obtain the tension detection result of the tow.

[0028] In the detection method provided by the present invention, in step S2), the Lyocell spinning machine is preferably a rectangular spinneret Lyocell spinning machine.

[0029] The detection method provided by the present invention preferably further comprises: repeating step S5) multiple times and taking an average value, wherein the number of repetitions may specifically be 3 times.

[0030] The present invention also provides a method for screening abnormal spindle positions in Lyocell spinning production, comprising the following steps:

[0031] The yarn tension of different spindle positions of the Lyocell spinning machine is detected according to the detection method described in the above technical solution, and the spindle position with abnormal tension is found by comparing the test results.

[0032] In the screening method provided by the present invention, it is preferred that the method further includes: repairing the spindle position with abnormal tension.

[0033] The method provided by the present invention fills the gap in the tension test of a single spindle position of a Lyocell spinning machine, can be used for detecting the spinning state, can check abnormal spindle positions without stopping the machine, and improve the spinning quality.

[0034] For the purpose of greater clarity, the invention is described in detail through the following examples.

[0035] Example 1

[0036] The spinning quality of the rectangular spinneret Lyocell spinning machine deteriorated, and the defects increased from an average of 0.7mg / 100g to 1.2mg / 100g. Analysis of the reasons revealed that the average torque of all spindles in each line was relatively stable, the viscosity of the glue was stable and unchanged, the water temperature of the heat exchanger and the spinneret insulation water temperature were controlled normally, and other process parameters were also controlled normally; and on-site observations found that there was no obvious change in the breakage and glue coating on the board surface, confirming that the change in defects was not caused by changes in process parameters. It is speculated that a small number of spindles were blocked by the spinneret insulation water pipe, resulting in low board temperature and increased torque, resulting in increased defects; or because the position of the measuring and blowing air duct was not adjusted in place during the production change, resulting in high or low torque on a single spindle, causing an increase in defects. It is necessary to find the problematic spindles and make adjustments.

[0037] Therefore, adopt Figure 1 The tension force detection device shown in the figure is Figure 2 The method shown is used to detect the tension of the tow at all spindle positions on the production line. The specific process is as follows:

[0038] (1) Fixing the base 3 of the tension force detection device on the upper edge of the spinning bath tank of a spindle position of a rectangular spinneret Lyocell spinning machine;

[0039] (2) calibrating the position of the base 3 by the base position calibration unit 4 of the tension force detection device;

[0040] (3) Put the tow limiting ring 1 of the tension force detection device on the tow;

[0041] (4) The tension force detection unit 2 of the tension force detection device is stretched to a specified position. At this time, the position of the tow is stretched from the initial position 10 of the tow to the end position 11 of the tow stretching, and the reading of the tension force detection unit 2 is read;

[0042] (5) Repeat step (4) 3 times and take the average value, which is the tension test result of the tow;

[0043] (6) According to steps (1) to (5), the tension of the yarn bundles at different spindle positions of the Lyocell spinning machine is tested, and the spindle positions with abnormal tension are found by comparing the test results.

[0044] Through the above tests, it was found that 6 spindles with torques above 1.5kg and 3 spindles with torques below 1.0kg had large deviations from the average torque of all spindles of 1.2kg. Further detailed inspections revealed that 4 of the 9 spindles with abnormal torques were due to the high position of the air duct, 2 were due to the low position of the air duct, and 2 were due to the blockage of the spinneret insulation water pipes. After adjusting the abnormal spindles, the defect dropped to 0.8mg / 100g and the quality returned to normal.

[0045] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for detecting the tension of a single spindle in Lyocell spinning production, characterized in that: The following steps are involved: S1) preparing a tension force detection device, wherein the tension force detection device comprises: a tow limiting ring; A tension force detection unit, the tension force detection unit is connected to the tow limiting ring; a base with a guide rail, the tension force detection unit is located on the base and can slide up and down along the guide rail of the base; a base position calibration unit for calibrating the position of the base; S2) fixing the base of the tension force detection device on the upper edge of the spinning bath tank of a spindle position of the Lyocell spinning machine; S3) calibrating the base position by a base position calibration unit of the tension force detection device; S4) putting the tow limiting ring of the tension force detection device on the tow; S5) stretching the tension detection unit of the tension detection device to a specified position, and reading the indication to obtain the tension detection result of the tow.

2. The detection method according to claim 1, characterized in that: In step S2), the Lyocell spinning machine is a Lyocell spinning machine with a rectangular spinneret.

3. The detection method according to claim 1, characterized in that: Also includes: Repeat step S5) multiple times and take the average value.

4. A method for screening abnormal spindle positions in Lyocell spinning production, characterized in that: The following steps are involved: The yarn tension of different spindle positions of the Lyocell spinning machine is detected by the detection method according to any one of claims 1 to 3, and the spindle position with abnormal tension is found by comparing the test results.

5. The abnormal ingot position screening method according to claim 4, characterized in that: Also includes: Repair the spindle position with abnormal tension.

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