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CN-116536819-B - Method for distributing temperature-controlled tow drafting proportion

CN116536819BCN 116536819 BCN116536819 BCN 116536819BCN-116536819-B

Abstract

The invention discloses a method for distributing temperature-controlled tow draft ratios, which comprises a water draft section I, a water draft section II and a water draft section III, wherein the water draft section I and the water draft section III are driven and controlled by a drive, the water draft section II is fixed by a bearing, and the draft ratio is self-adaptively adjusted by a temperature sensor. The silk bundle passes through the rolling shaft, and the water washing drafting is completed through the water drafting groove I and the water drafting groove II. The new water drawing section is used for adjusting the first drawing multiple and the third drawing multiple of water by water temperature, and the second drawing is passive drawing. When the temperature of the first water drawing tank is changed, the second water drawing tank is unchanged, the two sections of draft ratios are b (1-k)/a and a 2 c/1-k respectively, when the temperature of the second water drawing tank is changed, the first water drawing tank is unchanged, the two sections of draft ratios are ab 2 (1-k), c/(1-k) b respectively, when the temperature of the first water drawing tank is changed, the second water drawing tank is also changed, and the draft ratio is determined by the maximum temperature of the two sections of changes. The method for distributing the temperature control tow draft ratio is beneficial to the autonomous adjustment of draft multiple of the fiber, saves energy and ensures stable operation of a water drawing section.

Inventors

  • GAO BO
  • ZHANG JINYUAN
  • LIU DONG
  • LIN KANG
  • TANG YAFEI

Assignees

  • 中复神鹰碳纤维股份有限公司

Dates

Publication Date
20260512
Application Date
20230330

Claims (7)

  1. 1. A method for distributing a temperature-controlled tow draft ratio is characterized in that a water washing draft section is divided into a first water draft section (4), a second water draft section (5) and a third water draft section (7), the first water draft section and the third water draft section are controlled by a drive (3), the second water draft section is fixed by a bearing (6), the draft ratio is adaptively adjusted through a temperature sensor (8), and the tow (1) is subjected to water washing draft through a roller (2), a first water draft groove (9) and a second water draft groove (10).
  2. 2. The method of claim 1, wherein the water draw ratio is a, b, c, and the total draw ratio is abc.
  3. 3. The method of claim 2, wherein the first water tank (9) is at a temperature of 60-65 ℃ and the second water tank (10) is at a temperature of 66-70 ℃.
  4. 4. A method of controlling the draw ratio distribution of a tow according to claim 2, wherein the water wash draw section is water cooled by adjusting the water draw one and three draw times, and the water draw two is passive draw.
  5. 5. The method of claim 4, wherein when the temperature of the first water drawing tank (9) is changed and the second water drawing tank (10) is unchanged, the two-stage drawing ratios are b (1+k)/a, a 2 c/(1+k), and k is the temperature change of the first water drawing tank, (actual temperature t 1 -control value t 0 )/control value t 0 .
  6. 6. The method of claim 5, wherein the first water draw tank (9) is at a constant temperature and the second water draw tank (10) is at a constant temperature, and the two draw ratios are ab 2 (1+k), c/[ (1+k) b ].
  7. 7. The method of claim 4, wherein when the temperature of the first water tank (9) is changed and the second water tank (10) is changed, the draft ratio is determined by the maximum temperature of the two water tanks.

Description

Method for distributing temperature-controlled tow drafting proportion Technical Field The invention relates to the field of carbon fiber precursor preparation, in particular to a method for distributing a temperature-controlled tow drafting proportion. Background In the process of running and forming the carbon fiber precursor, each roller body is mainly driven by a driving motor and runs according to the drawing proportion specified by the process. The magnitude of the draft multiple of the fiber during the production of the precursor can affect the mechanical properties of the final carbon fiber. Under a certain stretching multiple, the strength of the carbonized carbon fiber precursor is improved along with the improvement of the stretching multiple. The production process of the precursor mainly comprises three major drafting steps of air drafting, water washing drafting and steam drafting. The water-washing drafting refers to continuous stretching of the filament bundle in water at a certain temperature through driving the drafting, and the control of the filament bundle stretching is formed usually through adjusting the proportion distribution of the active driving roller bodies. The strength and compactness of the fiber can be improved and the orientation degree can be improved by water washing and drafting. The traditional water washing drafting is poor in autonomous adaptability of fibers through driving control of drafting multiple, a driving motor breaks down, and the whole production line stops running. Therefore, the invention designs an energy-saving, autonomous and stable water washing drafting device. Disclosure of Invention In order to solve the above problems, the present invention aims to provide a method for controlling the distribution of the draft ratio of a filament bundle by temperature. The change of the water temperature can lead to the change of the drawability of the filament bundle, when the water temperature is increased, the drawability of the filament bundle is increased, and the two-section drawing is automatically adjusted so that the total drawing is unchanged. The method for distributing the drawing proportion of the temperature control filament bundle comprises a water washing drawing section for realizing the method, wherein the water washing drawing section comprises a water drawing section I4, a water drawing section II 5 and a water drawing section III 7; The first water stretch 4, the second water stretch 5 and the third water stretch 7 are connected in series. The first water drawing 4 and the third water drawing 7 are controlled by the drive 3, the second water drawing 5 is fixed by the bearing 6, the filament bundle 1 is driven by the roll shaft 2 of the drive 3 in the first water drawing 4, enters the third water drawing 7 along the second water drawing 5, and completes washing drawing through the first water drawing groove 9 and the second water drawing groove 10 at the bottom. The second water drawing device 5 is arranged between the first water drawing tank 9 and the second water drawing tank 10, a temperature sensor 8 is arranged in the first water drawing tank 9 and the second water drawing tank 10, and the drawing multiple is adjusted in a self-adaptive mode based on the temperature sensor 8. The temperature sensor is provided with a fixed temperature t 0 by a control room, when the temperature is higher than t 0, the water drawing groove filament bundle is softened due to the temperature rise, the drawability is increased, the rotation speed of the water drawing two 5 roll shafts in the corresponding water groove is increased, the rotation speed of the roll shaft in the other water drawing groove is reduced due to the fixed tension, and the temperature is lower than t 0 , and the opposite is the opposite. Further, the draft multiples of the first water drawing section 4, the second water drawing section 5 and the third water drawing section 7 are a, b and c respectively, and the total draft multiple of the water washing draft section is abc. Further, the temperature of the first water traction groove 9 is 60-65 ℃, and the temperature of the second water traction groove 10 is 66-70 ℃. Further, the water washing drafting section adjusts the drafting multiple of the first water drafting section 4 and the third water drafting section 7 by water temperature, and the second water drafting section 5 is the passive drafting section. Further, when the temperature of the first water drawing tank 9 changes, the second water drawing tank 10 is unchanged, and the two-section drawing ratios are b (1+k)/a, a 2 c/(1+k) respectively; Further, k refers to the water draw tank temperature change, (actual temperature t 1 -control value t 0)/control value t 0. Further, when the temperature of the first water drawing tank 9 is unchanged, the second water drawing tank 10 is changed, and the two-stage drawing ratios are ab 2 (1+k), and c/[ (1+k) b ]. Further, when the temperatur