An apparatus and method for improving fiber dispersion

Abstract

The application relates to the technical field of polyvinyl alcohol wet spinning production, and discloses a device and method for improving fiber dispersity, which comprises a rotating guide rod arranged at the outlet of a heat treatment machine, the rotating guide rod is used for adjusting the position of fiber tows, and the tows are directly opposite to the next equipment; the rotating guide rod comprises a guide rod assembly and a mounting assembly, the guide rod assembly is rotationally arranged on the mounting assembly, the mounting assembly is used for adjusting the inclination angle of the guide rod assembly, the guide rod assembly is in rolling contact with the fiber tows, and the included angle between the guide rod assembly and a horizontal plane is 0 DEG-90 DEG. The device exerts an acting force on the tows through the rotating guide rod, effectively ensures the advancing position of the tows, the tows and the rotating guide rod are in rolling friction, the friction between the tows and the rotating guide rod is small, the tows are not scratched, the dispersity of the vinylon fiber is obviously improved, and the one-grade rate of fiber dispersity is increased from 30%-50% to more than 90%.

Description

Technical Field

[0001] This invention relates to the field of polyvinyl alcohol wet spinning production technology, specifically to an apparatus and method for improving fiber dispersibility. Background Technology

[0002] Vinylon is a widely used synthetic fiber. It is a synthetic fiber (also known as polyvinyl alcohol fiber) manufactured by wet spinning using polyvinyl alcohol as the raw material and water as the solvent. Polyvinyl alcohol fiber has a wide range of applications. In the industrial field, it can be used to make canvas, waterproof cloth, filter cloth, conveyor belts, packaging materials, work clothes, fishing nets, and marine operation ropes. High-strength, high-modulus filaments can be used as the skeleton material for conveyor belts, lining materials for various rubber hoses, rubber sheets, and rubber shoes, and can also be used to make bicycle tire cords. It also has applications in non-woven fabrics and papermaking. The manufacturing process of vinylon fiber is as follows: a polyvinyl alcohol spinning solution with a concentration of about 15% to 16% (wt) is extruded from the micro-holes of the spinneret into a saturated sodium sulfate coagulation bath. After dehydration and coagulation, it forms a nascent fiber bundle. The nascent fiber bundle undergoes multiple heat treatment processes, including drying, preheating, stretching, and cooling, to orient and crystallize the fibers, resulting in vinylon filament bundles with certain mechanical properties, water solubility, and thickness. The vinylon filament bundles are then cut into short fibers by a cutting machine, followed by post-processing steps such as hot water crimping, non-essential acetalization, washing, oiling, drying, and packaging, to become short fibers that can be used by textile mills.

[0003] Currently, some of the vinylon fibers produced by our company are used to manufacture filter paper. Low-end applications include using them as filter materials to remove impurities from air or liquids, while high-end applications include using them as battery separator materials, such as battery separator paper, to separate the positive and negative electrodes of a battery, preventing electrons from passing through while allowing ions in the electrolyte to pass freely. To ensure the separator paper's isolation and ion-passing effects, the paper's uniformity and flatness are crucial. These properties are related to the dispersibility of the vinylon fiber raw material; the better the fiber's dispersibility in water, the better the quality of the separator paper. Furthermore, the fibers used for battery separator paper must meet a Class 1 dispersibility requirement. However, in actual production, the dispersibility of vinylon fibers is affected by many factors, including raw materials, processing conditions, and equipment. Each factor contains several influencing elements. Therefore, improving the dispersibility of vinylon fibers has always been a major challenge for enterprises. In order to provide vinylon fibers that meet customer needs, our company has conducted long-term research and improvement on this issue, and has provided a device and method to improve fiber dispersibility. This has effectively reduced the production costs of enterprises and significantly improved the dispersibility of vinylon fibers, increasing the first-grade fiber dispersion rate from 30%-50% to over 90%. Summary of the Invention

[0004] The present invention aims to provide an apparatus and method for improving fiber dispersion, which can significantly improve fiber dispersion while reducing enterprise production costs, so that the first-grade fiber dispersion rate reaches more than 90%.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An apparatus for improving fiber dispersion includes a rotating guide rod disposed at the outlet of a heat treatment machine. The rotating guide rod is used to adjust the position of the fiber bundle so that the fiber bundle is facing the next device. The rotating guide rod includes a guide rod assembly and a mounting assembly. The guide rod assembly is rotatably disposed on the mounting assembly. The tilt angle of the guide rod assembly is adjusted by the mounting assembly. The guide rod assembly is in rolling contact with the fiber bundle. The angle between the guide rod assembly and the horizontal plane is 0°-90°.

[0007] The inventive concept of this application is as follows:

[0008] As described in the background section, fiber dispersibility is affected by multiple factors, including raw materials, processing conditions, and equipment. Polyvinyl alcohol (PVA) is the foundation of wet spinning and plays a crucial role in fiber performance. Our company changed PVA raw materials of different purities to address this issue, but the first-grade fiber dispersion rate only reached 30%-50%, failing to meet the demands of high-end papermaking. Based on this, the inventors conducted experimental research on easily modifiable processing conditions. Analysis revealed that the difficulty in fiber dispersion might be due to adhesion and poor coagulation during spinning. An improvement method to address this problem was to increase the coagulation concentration (from the lower limit to the upper limit) to ensure sufficient dehydration when the raw material transitioned from a liquid to a solid phase. Simultaneously, spinning conditions were modified to increase the spacing between spinnerets, preventing adjacent fiber bundles from agglomerating. However, the final sampling results showed little improvement in fiber dispersibility. The inventors continued to improve the process under the influence of processing conditions, adjusting the heating temperature after fiber drying to mitigate adhesion caused by uneven heating, and then performing stretching to improve fiber strength. However, the results were still minimal, with the first-grade fiber dispersion rate remaining below 50%.

[0009] The factors influencing the equipment are often more difficult to control and adjust. The inventors conducted extensive research, adjusting the parameters of multiple machines. The fiber has the most contact with the rollers in each machine, but the parallelism between the rollers of multiple machines is difficult to control precisely during actual installation. Therefore, during roller conveying, the fiber bundle usually deviates and comes into contact with and rubs against the edge of the machine. Even if the direction of the fiber bundle can be adjusted by the passive roller, the fiber bundle will still deviate when other parameters change. Therefore, U-shaped guide rods are usually set at the outlet of the heat treatment machine. When the fiber bundle is not deviated, it is located between the U-shaped guide rods and does not come into contact with either side of the U-shaped guide rod. When one of the operating conditions changes, the fiber bundle will deviate in a certain direction and come into contact with one side of the U-shaped guide rod. When the direction of the fiber bundle changes, there is a risk of it detaching from the roller. At this time, manual adjustment of the passive roller angle is required for intervention.

[0010] To address the issue of frequent adjustments required due to fiber misalignment, the inventors replaced the existing metal guide rods with smooth glass guide rods. This reduced friction between the fiber bundle and the guide rod even after contact, unexpectedly improving fiber dispersion and significantly reducing the number of undispersible clumps. Analysis revealed that continuous friction caused fiber breakage, which was the primary source of clumps. High-powered microscopy allowed for detailed observation of these clumps, showing dozens to hundreds of fiber bundles wrapped around several other fibers. This entanglement hindered dispersion, thus identifying the key factor hindering effective improvement in fiber dispersion grade 1.

[0011] Inspired by this, the inventors improved the structure of the guide rod, changing the fixed guide rod to a rotating guide rod, which causes rolling friction between the filament bundle and the guide rod. At the same time, the rotating guide rod applies an opposite force in the offset direction of the filament bundle, guiding and limiting the filament bundle. This not only solved the problem of needing to frequently adjust the roller to ensure the direction of the filament bundle, but also improved the fiber dispersion, achieving a first-class fiber dispersion rate of over 95%. Compared with previous research and improvements focusing on raw materials and processing conditions, the production cost was significantly reduced, resulting in unexpected technical effects.

[0012] Beneficial effects:

[0013] 1. By setting a rotating guide rod on one side of the wire bundle offset direction, the rotating guide rod contacts the wire bundle, preventing the wire bundle from deviating and aligning the wire bundle with the inlet of the next device. This solves the problem of frequently adjusting the passive roller to avoid interference and friction with the device housing after the wire bundle deviates.

[0014] 2. The filament bundle is in contact with the rotating guide rod, and the rotating guide rod always applies a force to the filament bundle, which effectively ensures the filament bundle's travel position; and the filament bundle and the rotating guide rod undergo rolling friction, with low frictional force between the filament bundle and the rotating guide rod, so that the filament bundle is not scratched; in addition, the heat generated by the friction between the filament bundle and the rotating guide rod is small, which will not cause the filament bundle to stick together, and significantly improves the fiber dispersion.

[0015] 3. The guide rod assembly has an adjustable tilt angle, which facilitates the adjustment of the filament bundle position with minimal force, ensuring that the offset force of the filament bundle is balanced with the force applied by the guide rod, thereby guaranteeing that the filament bundle travels in a balanced state. An appropriate tilt angle ensures that the filament bundle is aligned with the inlet of the next device.

[0016] Preferably, as an improvement, the guide rod assembly includes a guide rod, a guide rod shaft, and a bearing, with the guide rod rotatably connected to the guide rod shaft via the bearing; the mounting assembly includes a support rod, an adjusting rod, and a mounting base, with the support rod and adjusting rod vertically mounted on the mounting base via a connector, and the guide rod shaft movably connected to the top of the support rod and adjusting rod, with the tilt angle of the guide rod shaft controlled by adjusting the length of the adjusting rod.

[0017] Preferably, as an improvement, the mounting base is provided with a long strip-shaped mounting groove, the support rod is fixed to the mounting groove by a connector, and the adjusting rod passes through the mounting groove and is fixed by a connector.

[0018] Preferably, as an improvement, the guide rod is made of stainless steel with a polished surface and a roughness of Ra0.8-1.2μm.

[0019] Beneficial effects: It can reduce the friction between the guide rod and the filament bundle without causing the filament bundle to slip on the guide rod.

[0020] The present invention also provides a method for improving fiber dispersion. The method involves setting the position and angle of a rotating guide rod to improve fiber dispersion. The heat treatment machine includes a dryer, a preheater, an extension machine, and a cooler connected in sequence. The rotating guide rod is inclinedly positioned at the outlet of the dryer, preheater, and extension machine. This rotating guide rod is called the first guide rod. The first guide rod makes rolling contact with one side of the fiber bundle, ensuring the position of the fiber bundle and preventing it from deviating. The cooler includes a cooling roller and a traction roller. The axis of the traction roller is higher than that of the cooling roller. The rotating guide rod is inclinedly positioned between the cooling roller and the traction roller. This rotating guide rod is called the second guide rod, and the fiber bundle passes over the second guide rod.

[0021] Beneficial effects: The first guide rod is installed at the outlet of the dryer, preheater, and stretching machine to adjust the outlet position of the filament bundle, ensuring that the filament bundle is aligned with the inlet of the next piece of equipment and preventing the filament bundle from deviating. Because the first guide rod can rotate, the friction between the filament bundle and the guide rod is small, resulting in minimal abrasion to the filament bundle. The second guide rod is positioned between the cooling roller and the traction roller to adjust the position of the filament bundle, ensuring that the filament bundle passes through the center of the traction roller surface, preventing the filament bundle from deviating and avoiding friction with the convex edge of the traction roller. Because the second guide rod can rotate, the friction generated when the filament bundle turns after passing over the second guide rod is small, resulting in no abrasion to the filament bundle.

[0022] Preferably, as an improvement, the first guide rod is inclined, and its inclination direction is the same as the offset direction of the fiber bundle.

[0023] Beneficial effects: It can limit the deviation of the filament bundle and reduce the squeezing effect of the first guide rod on the filament bundle.

[0024] Preferably, as an improvement, the inclination angle of the first guide rod to the horizontal plane is 20°-40°.

[0025] Beneficial effects: An inclination angle of 20°-40° for the first guide rod ensures contact between the rotating guide rod and the lower surface of the yarn bundle, applying appropriate force to balance the yarn bundle's offset force and maintain its direction of travel, always facing the inlet of the next piece of equipment. When the inclination angle is greater than 40°, the force applied to the yarn bundle on one side of the guide rod's inclination direction is greater than the force applied to the other side, causing the yarn bundle on the inclination side to be compressed and contracted. This indicates that the force applied by the guide rod to the yarn bundle is too large. At this time, the friction between the yarn bundle and the guide rod also increases significantly, damaging the yarn bundle. When the inclination angle is less than 20°, the force applied to the yarn bundle is small, unable to balance the yarn bundle's offset force, and the effect of correcting the yarn bundle's offset is small, making it difficult to ensure that the yarn bundle faces the inlet of the next piece of equipment.

[0026] Preferably, the first guide rod is tilted at an angle of 30° to the horizontal plane.

[0027] Preferably, as an improvement, the second guide rod is inclined, and its inclination direction is opposite to that of the traction roller.

[0028] Beneficial effect: The tilt direction is opposite to the position of the traction roller, which means that when the traction roller is to the left of the second guide rod, the tilt direction of the second guide rod is to the right. This can guide and limit the yarn bundle, preventing the yarn bundle from shifting to one side of the traction roller and rubbing against the edge of the traction roller.

[0029] Preferably, as an improvement, the inclination angle of the second guide rod to the horizontal plane is 30°-60°.

[0030] Beneficial effects: When the yarn bundle passes over the second guide rod, the lateral force on the yarn bundle is inconsistent. The greater the inclination angle with the horizontal plane, the greater the difference in force on the two sides of the yarn bundle. When the inclination angle is greater than 60°, the force on the upper side of the yarn bundle is greater than that on the lower side. The upper yarn bundle will deflect downward on the second guide rod, causing the yarn bundle to contract. This indicates that the second guide rod applies too much force to the yarn bundle. At this time, the friction between the yarn bundle and the second guide rod increases accordingly. When the inclination angle of the second guide rod with the horizontal plane is less than 30°, although the friction between the yarn bundle and the guide rod decreases, the corrective and steering effect of the guide rod on the yarn bundle is small, making it difficult to ensure that the yarn bundle passes through the center of the traction roller surface.

[0031] Preferably, the second guide rod is tilted at an angle of 45° to the horizontal plane.

[0032] Beneficial effects: When the tilt angle is 45°, the force on both sides of the filament bundle is relatively uniform, the second guide rod applies a moderate force to the filament bundle, and the frictional damage to the filament bundle is minimized. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the rotating guide rod of the present invention;

[0034] Figure 2 This is a side view of the rotating guide rod of the present invention;

[0035] Figure 3 This is a top view of the mounting plate of the present invention;

[0036] Figure 4 This is a schematic diagram of the rotating guide rod of the present invention installed on a heat treatment machine;

[0037] Figure 5 This is a schematic diagram of the rotating guide rod of the present invention installed on a cooling machine;

[0038] Figure 6 The first guide rod (U-shaped guide rod) in the fixed guide rod;

[0039] Figure 7 The second guide rod (a straight guide rod) is fixed in the guide rod system;

[0040] Figure 8 This is a sample image of Example 1;

[0041] Figure 9 This is a sample image of Example 2;

[0042] Figure 10 This is a sample image of Example 3;

[0043] Figure 11 This is a sample image of Example 4;

[0044] Figure 12 This is a sample image for Comparative Example 1;

[0045] Figure 13 This is a sample image for Comparative Example 2;

[0046] Figure 14 This is a sample image for Comparative Example 3;

[0047] Figure 15 This is a sample image for Comparative Example 4. Detailed Implementation

[0048] The following detailed description illustrates the specific implementation method:

[0049] The reference numerals in the accompanying drawings include: guide rod assembly 1, guide rod 11, bearing 12, guide rod shaft 13, support rod 131, mounting assembly 2, support rod 21, adjusting rod 22, mounting base 23, mounting groove 231, mounting hole 232, fastening bolt 3, pin 4, dryer 5, preheater 6, stretcher 7, cooler 8, passive cooling roller 81, active cooling roller 82, traction roller 83, yarn bundle 100, first guide rod 101, and second guide rod 102.

[0050] like Figure 1-3 As shown, this embodiment provides a device for improving fiber dispersion, including a rotating guide rod disposed at the outlet of a heat treatment machine. The rotating guide rod is used to adjust the position of the fiber bundle 100. The rotating guide rod includes a guide rod assembly 1 and a mounting assembly 2. The guide rod assembly 1 is rotatably disposed on the mounting assembly 2. The tilt angle of the guide rod assembly 1 is adjusted by the mounting assembly 2. The guide rod assembly 1 makes rolling contact with the fiber bundle 100. The angle between the guide rod assembly 1 and the horizontal plane is 0-90°, preferably 30°-60°. Specifically, the guide rod assembly 1 includes a guide rod 11, a guide rod shaft 13, and a bearing 12. The guide rod 11 is rotatably connected to the guide rod shaft 13 through the bearing 12. In this embodiment, the guide rod 11 is made of stainless steel and its surface is polished, with a roughness of Ra0.8-1.2μm. Mounting assembly 2 includes a support rod 21, an adjusting rod 22, and a mounting base 23. The support rod 21 and the adjusting rod 22 are vertically mounted on the mounting base 23 via connectors. The guide rod shaft 13 is movably connected to the top of the support rod 21 and the adjusting rod 22. The tilt angle of the guide rod shaft 13 is controlled by adjusting the length of the adjusting rod 22.

[0051] In this embodiment, the mounting base 23 is made of angle steel and includes a base plate and a side plate. The base plate is provided with a long strip-shaped mounting groove 231, and the side plate is provided with mounting holes 232. The mounting base 23 is fixed to the required equipment through the mounting holes 232. Specifically, the connecting component is a fastening bolt 3. The bottom of the support rod 21 is provided with a base. The base is fixed to the base plate of the mounting base 23 by the fastening bolt 3. The fastening bolt 3 passes through the mounting groove 231. By moving the support rod 21 horizontally, the position of the support rod 21 on the mounting base 23 can be adjusted. The adjusting rod 22 passes through the mounting groove 231 and is locked by the fastening bolt 3. One end of the guide rod shaft 13 is connected to the top of the support rod 21 through a pin 4. The guide rod shaft 13 is connected to the top of the adjusting rod 22 through a support rod 131. Specifically, the support rod 131 and the adjusting rod 22 are connected by a pin 4. The adjusting rod 22 is located between the support rod 21 and the guide rod 11. The tilt angle of the guide rod shaft 13 is controlled by adjusting the height of the adjusting rod 22.

[0052] This embodiment also provides a method for improving fiber dispersion, which involves adjusting the position and angle of a rotating guide rod to improve fiber dispersion, such as... Figure 4 As shown, the heat treatment machine includes a dryer 5, a preheater 6, an extension machine 7, and a cooler 8 connected in sequence. A rotating guide rod is inclinedly disposed at the outlet of the dryer 5, the preheater 6, and the extension machine 7. For easy distinction, this rotating guide rod is referred to as the first guide rod 101. The side of the fiber bundle 100 that is deviated makes rolling contact with the first guide rod 101. The first guide rod 101 ensures the position of the fiber bundle 100 and prevents the fiber bundle 100 from deviating, so that the outlet of the previous fiber bundle is directly opposite the inlet of the next device. Specifically, the tilt direction of the first guide rod 101 is the same as the deviation direction of the fiber bundle. The tilt angle of the first guide rod 101 with respect to the horizontal plane can be 20°, 30°, or 40°. In this embodiment, the optimal tilt angle is 30°.

[0053] like Figure 5 As shown, the cooling machine 8 includes a cooling roller and a traction roller 83. The cooling roller includes an active cooling roller 82 and a passive cooling roller 81. The axis of the traction roller 83 is higher than that of the cooling roller. A rotating guide rod is inclined between the cooling roller and the traction roller 83. This rotating guide rod is called the second guide rod 102, and the inclination direction of the second guide rod 102 is opposite to the position of the traction roller (that is, when the traction roller is on the left side of the second guide rod, the inclination direction of the second guide rod is to the right). The fiber bundle 100 passes over the second guide rod 102. The inclination angle of the second guide rod 102 with the horizontal plane is 30°, 45° or 60°, preferably 45°.

[0054] To address the aforementioned improvements, this invention underwent multiple experimental verifications, the results of which are as follows:

[0055] Experimental Example 1: Verifying the effect of different types of guide rods 11 and guide rod tilt angle on fiber dispersion.

[0056] Using a 16WT% polyvinyl alcohol stock solution with a polyvinyl alcohol purity of 95.6%, a corrugated spinneret with an orifice diameter of 0.07 mm and an orifice spacing of 0.42 mm, and a sodium sulfate concentration of 406-416 g / L, the drying temperature was 260-280℃, the preheating temperature was 240-260℃, and the extension temperature was 220-240℃. Under these unchanged basic conditions, the following method was adopted... Figure 6-7 The stainless steel fixed guide rod shown includes a U-shaped guide rod (first guide rod 101), a straight guide rod (second guide rod 102), a glass guide rod, and the rotating guide rod of this application, which are set at the outlet of the heat treatment machine. The specific experimental procedure is as follows:

[0057] like Figure 4 As shown, the first guide rod 101 is installed at the outlet of the dryer 5, preheater 6, and stretcher 7. The position of the filament bundle 100 is adjusted so that it is aligned with the inlet of the next piece of equipment to prevent the filament bundle 100 from deviating. Figure 5 As shown, the second guide rod 102 is installed at a certain angle between the active cooling roller 82 and the passive cooling roller 81 of the cooler 8. It is used to adjust the position of the filament bundle 100, so that the filament bundle 100 passes through the center of the traction roller 83 of the cooler 8, preventing the filament bundle 100 from deviating and rubbing against the edge of the traction roller 83. The initial production of vinylon fibers is processed by the dryer 5, the preheater 6, the stretching machine 7 and the cooler 8 to obtain a vinylon semi-finished product. The semi-finished product is wound on a yarn spool in the form of filament bundle 100. The semi-finished product wound on the yarn spool is then cut into a certain length by a cutting machine to obtain vinylon short fibers (fiber length of 3-6 mm) with a certain linear density, water solubility temperature and dispersibility grade.

[0058] Table 1: Measurement of fiber dispersion grade when producing short fibers with different linear densities and water-soluble temperatures using different guide rods.

[0059]

[0060] The method for measuring fiber dispersion grade is as follows:

[0061] 1. Randomly sample from the upper, middle and lower parts of each package of finished fiber.

[0062] 2. Add 4L of water to a 5L plastic measuring container.

[0063] 3. Weigh 4g of the sample and pour it into a measuring container filled with water.

[0064] 4. Stir with an electric mixer for 3 minutes.

[0065] 5. Use a 100ml beaker to scoop one cup of sample from the bottom of the measuring cylinder upwards.

[0066] 6. Pour the scooped sample into a beaker containing 2000ml of water and stir manually for 30 seconds.

[0067] 7. Pour the mixed sample into a round bucket covered with a black cloth to filter out the water.

[0068] 8. Remove the black cloth, dry and shape it into a sheet.

[0069] 9. The grade is determined by comparing the finished sample image with the standard sample; the standard sample is formulated based on the grade of our company's products.

[0070] Specifically, such as Figure 8-11 The image shows samples obtained in Examples 1-4. Figure 12-15 This is the sample obtained from comparative examples 1-4. Based on Table 1 and... Figure 8-15 We can obtain:

[0071] (1) The fiber dispersion first-order rate of the fiber manufactured using the stainless steel rotating guide rod of this application is greater than 90%, and can reach up to 96%; the fiber dispersion first-order rate of the fiber manufactured using the stainless steel fixed guide rod is less than 55%, while the fiber dispersion first-order rate of the fiber manufactured using the glass fixed guide rod is improved compared with the stainless steel guide rod, with a maximum of 90%; but the effect is still lower than that of the stainless steel rotating guide rod of this application.

[0072] (2) According to Examples 1-4, when the inclination angle between the first guide rod and the horizontal plane is 30° and the inclination angle between the second guide rod and the horizontal plane is 45°, the first-order fiber dispersion rate can reach 96%; and when the inclination angle of the second guide rod is in the range of 30-60°, the first-order fiber dispersion rate is greater than 90% for producing fiber types with different linear densities and water solubility temperatures. However, according to Comparative Examples 6-7, when the inclination angle of the first guide rod is greater than 40°, or when the inclination angle of the second guide rod is greater than 60°, during the process of guiding the fiber bundle, due to the large applied force, the limiting fiber bundle will shrink to a certain extent, and the frictional extrusion pressure will increase, and the fibers will also adhere, thereby reducing the fiber dispersion.

[0073] In summary, whether rolling friction occurs between the fiber bundle and the guide rod, as well as the tilt angle of the fiber bundle and the guide rod, together affect the first-order dispersion rate of the fiber.

[0074] Experimental Example 2:

[0075] The difference between this experiment and Experiment 1 is that other production conditions remain unchanged. This experiment is an attempt to improve the purity of the raw materials by using stainless steel fixed guide rods. The angle between the first guide rod and the horizontal plane is 90°, and the angle between the second guide rod and the horizontal plane is 45°. The results are shown in Table 2 below:

[0076] Table 2: Effect of raw materials of different purities on fiber dispersibility first-order rate

[0077] Test case Raw material purity / % Fiber dispersion first grade rate / % Linear density / dtex Water solubility temperature / ℃ Comparative Example 8 94 41 1.06 109 Comparative Example 9 95 38 1.06 109 Comparative Example 10 96 35 1.06 109

[0078] According to Comparative Examples 8-9, increasing the purity of the raw materials does not significantly change the first-order fiber dispersibility rate, and all of them are below 50%.

[0079] Experimental Example 3

[0080] The difference between this test example and Test Example 1 is that, with other production conditions remaining unchanged, this test example is an improvement attempt made by changing the spinneret spacing under the condition of using stainless steel fixed guide rods, in order to avoid adhesion between adjacent filament bundles; the angle between the first guide rod and the horizontal plane is 90°, and the angle between the second guide rod and the horizontal plane is 45°. The results are shown in Table 3 below:

[0081] Table 3: Effect of different spinneret spacings on fiber dispersion first-order rate

[0082]

[0083] According to Comparative Examples 11-12, increasing the spinneret spacing does not significantly change the fiber dispersion first-order rate, and all of them are below 50%.

[0084] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An apparatus for improving fiber dispersion, characterized by: The application relates to a rotating guide rod arranged at the outlet of a heat treatment machine, which is used to adjust the position of a fiber tow, the rotating guide rod comprising a guide rod assembly and a mounting assembly, the guide rod assembly being rotatably arranged on the mounting assembly, the mounting assembly being used to adjust the inclination angle of the guide rod assembly, the guide rod assembly being in rolling contact with the fiber tow, and the included angle between the guide rod assembly and the horizontal plane being 0-90 degrees. The guide rod assembly comprises a guide rod, a guide rod shaft and a bearing, the guide rod being rotatably connected with the guide rod shaft through the bearing; the guide rod is made of stainless steel with polished surface, and the roughness is Ra 0.8-1.2 mu m; the mounting assembly comprises a supporting rod, an adjusting rod and a mounting base, the supporting rod and the adjusting rod being vertically arranged on the mounting base through a connecting piece, the guide rod shaft being movably connected with the top of the supporting rod and the adjusting rod, and the inclination angle of the guide rod shaft being controlled by adjusting the length of the adjusting rod. The heat treatment machine comprises a drying machine, a preheating machine, an extending machine and a cooling machine which are connected in sequence, the rotating guide rod being arranged at the outlet of the drying machine, the preheating machine and the extending machine, and being called a first rotating guide rod, the first rotating guide rod being in rolling contact with one side of the fiber tow, and the position of the fiber tow being ensured by the first rotating guide rod to prevent the fiber tow from deviating; the cooling machine comprises a cooling roller and a traction roller, the axis of the traction roller being higher than that of the cooling roller, and the rotating guide rod being arranged between the cooling roller and the traction roller, and being called a second rotating guide rod, the fiber tow passing through the second rotating guide rod. The inclination angle between the first rotating guide rod and the horizontal plane is 20-40 degrees, and the inclination angle between the second rotating guide rod and the horizontal plane is 30-60 degrees.

2. A device for improving the dispersibility of fibres according to claim 1 characterised in that: The mounting base is provided with a long strip-shaped mounting groove, the supporting rod being fixed on the mounting groove through a connecting piece, and the adjusting rod being fixed after passing through the mounting groove through a connecting piece.

3. The apparatus for improving fiber dispersion of claim 1, wherein: The inclination direction of the first rotating guide rod is the same as the deviation direction of the fiber tow.

4. The apparatus for improving fiber dispersion of claim 1, wherein: The inclination direction of the second rotating guide rod is opposite to the position of the traction roller.

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