A method of temperature control of a proportioning of a filament bundle draft

By adaptively adjusting the washing and stretching ratio using a temperature sensor, the problems of poor fiber self-adaptability and high energy consumption in traditional washing and stretching are solved, achieving stable operation and energy-saving washing and stretching effects.

CN116536819BActive Publication Date: 2026-05-12ZHONGFU SHENYING CARBON FIBER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHONGFU SHENYING CARBON FIBER
Filing Date
2023-03-30
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

In the traditional water washing and stretching process, the fibers have poor self-adaptability, drive motor failures can cause the production line to stop operating, and energy consumption is high.

Method used

A temperature-controlled fiber bundle stretching ratio distribution method is adopted. The water washing stretching ratio is adaptively adjusted by a temperature sensor. Water stretching one and water stretching three are driven and controlled, while water stretching two is passive. The stretching ratio is automatically adjusted by water temperature changes to achieve stable operation and energy saving.

Benefits of technology

Stable operation of the washing and stretching process was achieved without motor control, reducing energy consumption, minimizing fiber damage, and improving fiber self-adaptability and production stability.

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Abstract

This invention discloses a method for temperature-controlled fiber tow drawing ratio allocation. The water washing and drawing section is divided into three stages: water drawing one, water drawing two, and water drawing three. Water drawing one and three are driven to control the drawing ratio, while water drawing two is fixed by bearings and its drawing ratio is adaptively adjusted by a temperature sensor. The fiber tow passes through rollers, water drawing tank one, and water drawing tank two to complete the water washing and drawing process. In the new water drawing section, the drawing ratios of water drawing one and three are adjusted by the water temperature, while water drawing two is passively drawn. When the temperature of water drawing tank one changes, water drawing tank two remains constant, and the drawing ratios of the two sections are b(1-k) / a and a, respectively. 2 c / 1-k; When the temperature of water-drawing tank two changes while water-drawing tank one remains constant, the draw ratios of the two sections are ab and b respectively. 2 (1-k), c / (1-k)b; When the temperature of water drawing tank one changes, water drawing tank two also changes, and the draw ratio is determined by the temperature of the two sections with the largest temperature changes. The method of temperature-controlled fiber bundle draw ratio distribution is beneficial for the fiber to autonomously adjust the draw ratio, save energy, and ensure stable operation of the water drawing section.
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Description

Technical Field

[0001] This invention relates to the field of carbon fiber precursor preparation, and specifically to a method for temperature-controlled distribution of the fiber tow stretching ratio. Background Technology

[0002] During the fiber spinning process, the rollers are mainly driven by motors and operate according to the specified draw ratio. The draw ratio of the fiber affects the final mechanical properties of the carbon fiber. At a certain draw ratio, the strength of the carbonized carbon fiber increases with increasing draw ratio. There are three main drawing processes in the fiber production process: air drawing, water washing drawing, and steam drawing.

[0003] Water-washed drafting refers to the continuous stretching of a fiber bundle in water at a certain temperature through a driving drafting mechanism. This stretching is typically controlled by adjusting the proportion of the active drive rollers. Water-washed drafting can improve fiber strength, fiber density, and orientation.

[0004] Traditional water washing and drafting methods control the drafting ratio via a drive, resulting in poor fiber adaptability. If the drive motor malfunctions, the entire production line will cease operation. Therefore, this invention designs an energy-saving, autonomous, and stable water washing and drafting device. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to provide a method for temperature-controlled distribution of the fiber tow stretching ratio. Changes in water temperature lead to changes in the stretchability of the fiber tow. When the water temperature increases, the stretchability of the fiber tow increases, and the two stretching stages are automatically adjusted to keep the total stretching constant.

[0006] A method for temperature-controlled fiber tow stretching ratio distribution, wherein the water washing and stretching section for implementing the method is divided into water stretching one 4, water stretching two 5, and water stretching three 7.

[0007] Water-drawing system 4, water-drawing system 5, and water-drawing system 7 are connected in series. The draw ratios of water-drawing system 4 and water-drawing system 7 are controlled by drive 3, while water-drawing system 2 is fixed by bearing 6. The yarn bundle 1 is driven by the roller 2 of drive 3 in water-drawing system 4, enters water-drawing system 7 along water-drawing system 2, and completes water washing and drawing after passing through bottom water-drawing groove 9 and water-drawing groove 10. Water-drawing system 2 is located between water-drawing groove 9 and water-drawing groove 10. Temperature sensors 8 are installed in water-drawing groove 9 and water-drawing groove 2, and the draw ratio is adaptively adjusted based on the temperature sensors 8. The temperature sensor is set to a fixed temperature t0 by the control room. When the temperature is higher than t0, the yarn bundle in this water-drawing groove softens due to the increased temperature, increasing its drawability, causing the roller of water-drawing system 2 to rotate faster in the corresponding water groove, while the roller in the other water-drawing groove needs to maintain a fixed tension and its rotation speed decreases; the opposite occurs when the temperature is lower than t0.

[0008] Furthermore, the draw ratios of water-drawing section 1 (4), water-drawing section 2 (5), and water-drawing section 3 (7) are a, b, and c, respectively, and the total draw ratio of the water washing and drawing section is abc.

[0009] Furthermore, the temperature of water-pulling tank 19 is 60~65℃, and the temperature of water-pulling tank 20 is 66~70℃.

[0010] Furthermore, the water washing and stretching section adjusts the stretching ratio of water stretching 4 and water stretching 3 7 by adjusting the water temperature, while water stretching 5 is a passive stretching process.

[0011] Furthermore, when the temperature of water-drawing tank 9 changes while the temperature of water-drawing tank 10 remains constant, the draw ratios of the two sections are b(1+k) / a and a, respectively. 2 c / (1+k);

[0012] Furthermore, k refers to the temperature change of the water tank, (actual temperature t1 - control value t0) / control value t0.

[0013] Furthermore, when the temperature of water-drawing tank 9 remains constant, while the temperature of water-drawing tank 10 changes, the draw ratios of the two sections are ab and b, respectively. 2 (1+k), c / [(1+k)b].

[0014] Furthermore, when the temperature of water-drawing tank 9 changes and water-drawing tank 10 changes, the draw ratio is determined by the temperature of the two sections with the largest temperature changes.

[0015] Due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows:

[0016] (1) Compared with the traditional water-pulling motors controlling each motor at the same time, the present invention can make the process run stably even when there is no motor in the water-pulling process. The water-pulling one and water-pulling three drives the water-pulling two to continue to move, so that the water-pulling process of the yarn bundle continues to run stably.

[0017] (2) Compared with traditional water-pulling equipment, this method eliminates the need for two water-pulling motors, thus reducing energy consumption.

[0018] (3) Compared with the traditional water washing and stretching, the water stretching of the first, second and third stages relies on the setting of the stretching ratio control and the water temperature to achieve the self-adjustment of the water stretching ratio, which is more conducive to the reasonable stretching of the filament bundle. The active stretching of the filament bundle by the roller shaft results in less damage compared with passive stretching. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention.

[0020] In the diagram: 1. Fiber bundle; 2. Roller shaft; 3. Drive; 4. Water pull one; 5. Water pull two; 6. Bearing; 7. Water pull three; 8. Temperature sensor; 9. Water pull trough one; 10. Water pull trough two. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0022] The washing and drawing section is divided into three stages: Water Drawing 1 (4), Water Drawing 2 (5), and Water Drawing 3 (7). The drawing ratios of Water Drawing 1 (4) and Water Drawing 3 (7) are controlled by drive 3, while Water Drawing 2 is fixed by bearing 6 and its drawing ratio is adaptively adjusted by temperature sensor 8. The yarn bundle 1 passes through roller 2, and then through Water Drawing 1 (9) and Water Drawing 2 (10) to complete the washing and drawing process. The drawing ratios of Water Drawing 1, Water Drawing 2, and Water Drawing 3 are a, b, and c, respectively, with a total drawing ratio of abc. Since the drawing ratios of Water Drawing 1 (4) and Water Drawing 3 (7) are adjusted by water temperature in the washing and drawing section, Water Drawing 2 (5) is passively drawn. When the temperature of Water Drawing 1 (9) changes, the temperature of Water Drawing 2 (10) remains constant, and the drawing ratios of the two stages are b(1+k) / a and a, respectively. 2 c / 1+k; When the temperature of water-drawing tank two changes while water-drawing tank one remains constant, the draw ratios of the two sections are ab respectively. 2 (1+k), c / (1+k)b; When the temperature of water drawing tank one changes, water drawing tank two also changes. The draw ratio is determined by the maximum temperature change in the two sections, where k[(actual temperature t1 - control value t0) / control value t0] refers to the temperature variable. The method of temperature-controlled fiber bundle draw ratio allocation is beneficial for the fiber to autonomously adjust the draw ratio, save energy, and ensure stable operation of the water drawing section.

[0023] Example 1

[0024] The filament bundle is driven by roller 2 and passes through water-drawing grooves 9 and 10 to complete the washing and drawing process. The washing and drawing section is divided into three stages: water-drawing one (4), water-drawing two (5), and water-drawing three (7). The drawing ratios of water-drawing one and three are controlled by drive 3, while water-drawing two is fixed by bearing 6 and its drawing ratio is adaptively adjusted by temperature sensor 8. The original drawing ratios of water-drawing one, two, and three are 1, 1.1, and 1.2, respectively, with a total drawing ratio of 1.32. The temperature of water-drawing groove 9 is 62℃, and the temperature of water-drawing groove 10 is 67℃. The water-washing and drawing section adjusts the drawing ratios of water-drawing one and three by water temperature, while water-drawing two is passively drawn. When the temperature of water-drawing groove 9 is 64℃ and water-drawing groove 10 remains unchanged, the total drawing ratio of the two stages is 1.1(1+1 / 31) / 1×1 2 ×1.2 / (1+1 / 31)=1.32.

[0025] Example 2

[0026] The initial, second, and third water-drawing stages have draw ratios of 1.1, 1.2, and 1.3 respectively, with a total draw ratio of 1.716. The temperature in water-drawing tank 9 is 65℃, and the temperature in water-drawing tank 10 is 68℃. The water washing and drawing section regulates the draw ratios of water-drawing stages one and three by adjusting the water temperature, while water-drawing stage two is passively drawn. When the temperature in water-drawing tank 9 is 65℃ and the temperature in water-drawing tank 10 is 70℃, the total draw ratio of the two sections is 1.1 × 1.2. 2(1+1 / 68)×1.3 / [(1+1 / 68)1.2]=1.716.

[0027] Example 3

[0028] The draft ratios for the first, second, and third stages of the water-based drafting process are 1.1, 1.2, and 1.3, respectively, with a total draft ratio of 1.716. The temperature in water-based drafting tank 9 is 65℃, and the temperature in water-based drafting tank 10 is 68℃. The water washing and drafting section regulates the draft ratios for the first and third stages of water-based drafting by adjusting the water temperature, while water-based drafting stage 2 is passively drafted. When the temperature in water-based drafting tank 9 is 65℃ and the temperature in water-based drafting tank 10 is 66℃, the draft ratio between the two stages is 1.1 × 1.2. 2 (1+1 / 68)×1.3 / [(1+1 / 68)1.2]=1.716.

[0029] Example 4

[0030] The initial, second, and third draw ratios for the raw water drawing process are 1.1, 1.2, and 1.3, respectively, with a total draw ratio of 1.716. The temperature in water drawing tank 9 is 60℃, and the temperature in water drawing tank 10 is 66℃. The water washing and drawing section regulates the draw ratios of water drawing processes one and three by adjusting the water temperature, while water drawing process two is passive. When the temperature in water drawing tank 9 is 65℃ and the temperature in water drawing tank 10 is 70℃, the draw ratio between the two sections is 1.2(1+1 / 12) / 1.1×1.1. 2 ×1.3 / (1+1 / 12)=1.716.

Claims

1. A method for temperature-controlled fiber tow draw ratio distribution, characterized in that, The water washing and stretching section is divided into water stretching one (4), water stretching two (5), and water stretching three (7). The stretching ratio of water stretching one and water stretching three is controlled by the drive (3), while water stretching two is fixed by the bearing (6) and the stretching ratio is adaptively adjusted by the temperature sensor (8). The filament bundle (1) passes through the roller (2) and water stretching groove one (9) and water stretching groove two (10) to complete the water washing and stretching.

2. The method for temperature-controlled fiber tow stretching ratio distribution according to claim 1, characterized in that, The draw ratios for water-based first, second, and third stages are a, b, and c, respectively, and the total draw ratio is abc.

3. The method for temperature-controlled fiber tow stretching ratio distribution according to claim 2, characterized in that, The temperature of water-pulling tank 1 (9) is 60~65℃, and the temperature of water-pulling tank 2 (10) is 66~70℃.

4. The method for temperature-controlled fiber tow stretching ratio distribution according to claim 2, characterized in that, The water washing and stretching section uses water temperature to regulate the stretching ratios of water stretching one and three, while water stretching two is a passive stretching process.

5. The method for temperature-controlled fiber tow stretching ratio distribution according to claim 4, characterized in that, When the temperature of water-drawing tank one (9) changes, while the temperature of water-drawing tank two (10) remains constant, the drawing ratios of the two sections are b(1+k) / a and a, respectively. 2 c / (1+k); k refers to the temperature change of the water tank, (actual temperature t1-control value t0) / control value t0.

6. The method for temperature-controlled fiber tow drawing ratio distribution according to claim 5, characterized in that, When the temperature of water-drawing tank one (9) remains constant, while the temperature of water-drawing tank two (10) changes, the draw ratios of the two sections are ab and b, respectively. 2 (1+k), c / [(1+k)b].

7. The method for temperature-controlled fiber tow stretching ratio distribution according to claim 4, characterized in that, When the temperature of water-drawing tank 1 (9) changes, the temperature of water-drawing tank 2 (10) changes, and the draw ratio is determined by the two water-drawing tanks with the largest temperature changes.