Preparation method of irregular bamboo joint drawn yarn

Abstract

The invention belongs to the technical field of textile, and particularly relates to a preparation method of irregular bamboo joint drawn yarn, which comprises an oiling process, a pre-interlacing process, a drawing and shaping process and a main interlacing process which are adjacent in sequence, the pre-interlacing adopts a pre-interlacing device, and the pre-interlacing device is provided with airflow spray holes which are horizontally arranged; the air supply device supplies air to the pre-interlacer; the air supply device comprises a driving mechanism, and an air inlet pipe, a first fixed plate, a variable-pressure turntable, a second fixed plate and an air outlet pipe which are arranged in sequence; an air inlet is formed in the first fixing plate, a plurality of vent holes distributed around the center circumference of the variable-pressure rotating disc are formed in the variable-pressure rotating disc, the hole diameters of the vent holes are not completely the same, and an air outlet is formed in the second fixing plate; the outlet end of the air inlet pipe is connected with the air inlet, the inlet end of the air outlet pipe is connected with the air outlet, and the air outlet end of the air outlet pipe is connected with the airflow spraying hole; the first fixing plate, the variable-voltage rotating disc and the second fixing plate are attached to one another, and the driving mechanism is used for driving the variable-voltage rotating disc to rotate around the center at a constant speed.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of textiles, and relates to a preparation method of irregular slubbing yarn. BACKGROUND

[0002] With the sustained growth of the domestic economy, the pursuit of high-quality life by the public is constantly improving, and consumers' requirements for fiber textiles are increasingly stringent, especially in terms of fabric texture and functionality, which promotes the rapid development of fiber products in the direction of differentiation, and various innovative products emerge in an endless stream. Among them, the colored stripes presented by the fabric woven by the slubbing yarn after dyeing treatment are unique and popular in the market and are widely used.

[0003] Slubbing yarn is a filament yarn with various change characteristics in length direction, such as thickness, crystalline orientation, dyeing depth, boiling water shrinkage, and initial modulus. Patent application CN109594137A discloses a production method of high-breathability polyester slubbing yarn, which has soft and delicate hand feeling and good breathability, and although it has a special "slubbing" style effect, the slubbing density is low, only about 10 / m.

[0004] To increase the slubbing density, the pre-network air pressure needs to be increased, but this will cause the following problems:

[0005] (1) Patent application CN109594137A first uses an oil truck to oil, and then performs pre-network bundling. On the one hand, the filaments are separated when the oil truck oils, and have not been bundled yet, so that the filaments are easily broken due to excessive tension after passing through the oil truck, and then enter the high-pressure pre-network air flow, which further aggravates the collision between the fibers and the inner wall of the filament channel of the pre-network device, resulting in fuzz and broken filaments. On the other hand, the distance from the filament bundle coming out of the spinneret to the bundling is very large, and the filament bundle is easily shaken greatly. Due to the large shaking of the filament bundle, the impact force of the vertical jet air flow on the filament bundle in the pre-network device is inconsistent, thereby causing uneven network points.

[0006] (2) Since the stretching of the nozzle is weak and the resistance of the filament bundle to air is small when it moves downward, the tension of the filament bundle is very small. The pre-network device of patent application CN109594137A is in C-shaped structure. When the pre-network air pressure is increased, the filament bundle with small tension will be blown out of the pre-network device directly, and cannot complete the starting. In view of the above situation, in the actual production process, the pre-network air pressure can only be adjusted to about 0.09 MPa when restarting, and the pre-network air pressure is increased after the starting is successful. This will cause the bottom layer of the product to have no slubbing effect, and the bottom layer of the product with no slubbing effect has to be cut off, increasing the loss.

[0007] Therefore, there is an urgent need for a preparation method of high-density slub drafting yarn that can effectively increase the slub density while avoiding the above problems. SUMMARY

[0008] The purpose of the present application is to solve the problems existing in the prior art and provide a preparation method of high-density slub drafting yarn.

[0009] To achieve the above-mentioned purpose, the technical solutions adopted by the present application are as follows:

[0010] A preparation method of high-density slub drafting yarn, comprising sequentially adjacent oiling process, pre-networking process, drafting and setting process and main networking process, oiling adopts oil nozzle;

[0011] The pre-networking air pressure is 0.38-0.45MPa, and the network point is increased before the drafting and setting process, because at this time the speed of the yarn is relatively slow, and the tension is relatively small, and the network point formed under this condition is more firm; in addition, higher air pressure will destroy the ordered arrangement of macromolecules in the fiber, resulting in a decrease in orientation and crystallinity, which is beneficial to improve the boiling water shrinkage of the fiber;

[0012] The pre-networking adopts a pre-networking device, which is an equal-section (i.e. the shape and size of the cross section remain unchanged in the length direction of the entire vertical plate) vertical plate, which is provided with a horizontal air flow jet hole, a certain cross section of the pre-networking device passes through the air flow jet hole, the cross section is an Archimedes spiral, the polar angle of the Archimedes spiral is greater than 360° and less than 450°, the air flow jet hole is located at a position with a polar angle of 180° on the Archimedes spiral, and the air flow jet hole faces the center of the Archimedes spiral;

[0013] The guide hook at the inlet and outlet of the pre-networking device is a groove-shaped guide hook, which is composed of a U-shaped guide hook and a limiting block, the U-shaped guide hook is horizontally arranged, the limiting block is connected with the inner wall of the U-shaped guide hook, and is used for limiting the yarn in the bottom area of the U-shaped guide hook; the yarn passes through the bottom area of the upper groove-shaped guide hook, the center position of the pre-networking device and the bottom area of the lower groove-shaped guide hook in sequence from top to bottom.

[0014] The present application sets the pre-networking air pressure to 0.38-0.45MPa (significantly higher than the pre-networking air pressure 2.8-3.0kgf / cm 2 ), which can increase the firmness and density of the network node, and further improve the density of the slub. In order to avoid the problems of hair, broken yarn, uneven network points and failure to complete the head due to the increase of pre-networking air pressure, the present application changes the oiling method of patent application CN109594137A from oiling on the oil wheel to oiling on the oil nozzle, and changes the pre-networking device of patent application CN109594137A (its cross section isFigure 2 The pre-networker shown in a is replaced by a pre-networker with an Archimedes spiral structure, and the U-shaped guide wire hooks before and after the pre-networker of patent application CN109594137A are replaced by groove-shaped guide wire hooks, which are specifically described as follows:

[0015] The present application adopts oiling on the oil nozzle, and after the fiber bundle enters the fiber channel of the oil nozzle, the oil agent is sprayed from the oil injection hole of the oil nozzle to oil the fiber bundle. The single filaments of the oiled fiber bundle also have good mutual adhesion, and the bundle can be completed. Compared with CN109594137A, the bundling distance is reduced.

[0016] The present application adopts a pre-networker with an Archimedes spiral structure, and the inner chamber is a relatively closed structure that can lock the fiber bundle so that it does not jump out of the pre-networker. At the same time, it can optimize the stress points of the fiber bundle after entering the pre-networker, so that the single filaments of the fiber bundle have better cohesion in the pre-networker, ensuring the network nodes, and the airflow in the pre-networker can be discharged after rotation, making the inner chamber pressure of the pre-networker more stable, and the fiber bundle is not easy to rub against the edge of the pre-networker, reducing the generation of broken ends and improving the breaking strength of the fiber.

[0017] The present application fixes the fiber bundle at the middle position of the pre-networker by two groove-shaped guide wire hooks, so that the stress points of the fiber bundle after entering the pre-networker are more consistent. If the conventional U-shaped guide wire hook is used, it is easy to cause the fiber bundle to have a large angle before and after the pre-networker, which leads to the fact that the fiber bundle cannot be fixed at the middle position of the pre-networker, resulting in inconsistent stress points and uneven network points.

[0018] As a preferred technical solution:

[0019] The Archimedes spiral coefficient (representing the increase or decrease of the polar radius per 1 degree of rotation) of the Archimedes spiral of the above-mentioned high-density slub drafting yarn preparation method is 1-2 mm / °, and the polar radius when the polar angle is 0° is 1.5-2 mm; the airflow injection hole is a circular hole with a diameter of 1.1-1.3 mm, and is located at the middle position of the pre-networker along the vertical direction; along the vertical direction, the length of the pre-networker is 23-27 mm.

[0020] The Archimedes spiral coefficient (representing the increase or decrease of the polar radius per 1 degree of rotation) of the above-mentioned high-density slub drafting yarn preparation method is 1-2 mm / °, and the polar radius when the polar angle is 0° is 1.5-2 mm; the airflow injection hole is a circular hole with a diameter of 1.1-1.3 mm, and is located at the middle position of the pre-networker along the vertical direction; along the vertical direction, the length of the pre-networker is 23-27 mm.

[0021] The airflow injection hole of each pre-networker of each spinning position is communicated with a branch pipe, all branch pipes are communicated with the same main pipe, and an automatic pressure regulating valve is arranged on the gas inlet end of the main pipe.

[0022] Because the high-density slubbing drawing yarn requires high uniformity of network air pressure, in actual production, in order to ensure that the air pressure is high enough, a configuration scheme of sharing one network main pipe for every 6 spinning positions is adopted. The pre-network pipe pressure needs to be maintained at 2.4-2.8 MPa, and after removing pressure loss, etc., the pre-network air pressure of each spinning position is set at 0.38-0.45 MPa. In the production process, once a special situation such as a broken end occurs and causes an individual spinning position to stop, the pre-networker electromagnetic valve of the spinning position will automatically close. At this time, if there is no automatic pressure regulating valve, the main pipe air pressure will rise due to the closure of part of the airflow channel, and then the pre-network air pressure of other spinning positions being produced will rise, exceeding the process set value. The instability of the air pressure will directly affect the formation of the network nodes, and ultimately destroy the uniformity of the slubbing effect. The present application is provided with an automatic pressure regulating valve at the air inlet end of the main pipe, which can adjust the main pipe air pressure in real time, ensure that the pre-network air pressure of other spinning positions always remains consistent with the process design range, and thus guarantee the production quality of the high-density slubbing drawing yarn.

[0023] The preparation method of the high-density slubbing drawing yarn as described above adopts GR1 hot roller group and GR2 hot roller group, the linear speed of the GR1 hot roller group is 1500-1640 m / min, the linear speed of the GR2 hot roller group is 2850-3000 m / min, and the draw ratio is 1.75-1.9 times.

[0024] The preparation method of the high-density slubbing drawing yarn as described above, the GR1 hot roller group is composed of GR1 hot roller A and GR1 hot roller B, the temperature of the GR1 hot roller group (i.e. the temperature of the GR1 hot roller A and the GR1 hot roller B) is 55-65℃, the GR2 hot roller group is composed of GR2 hot roller A and GR2 roller B, the temperature of the GR2 hot roller A is 100-105℃, and the GR2 roller B is a splitting roller and is not heated.

[0025] The main network adopts a main networker.

[0026] The circumferential surface roughness of the GR1 hot roller A is uniform and has a value of 0.05 μm, the circumferential surface roughness of the GR1 hot roller B is uniform and has a value of 0.05 μm, the circumferential surface roughness of the GR2 hot roller A is uniform and has a value of 0.9±0.05 μm, and the circumferential surface roughness of the GR2 roller B is uniform and has a value of 0.9±0.05 μm.

[0027] The GR1 hot roller A, the GR1 hot roller B, the GR2 hot roller A and the GR2 roller B all have a cylindrical structure, the diameters of the GR1 hot roller A, the GR1 hot roller B and the GR2 hot roller A are all 220 mm, and the diameter of the GR2 roller B is 110 mm.

[0028] The winding turns of the yarn on the GR1 hot roller group and the GR2 hot roller group are both 4.5-5.5.

[0029] The temperature of the GR1 hot roller group is set to 55-65℃, which is mainly used to form a firm network node in the tow before the drawing process. When the tow passes through the hot roller, the part with the network node is not easy to be fully heated due to the structural characteristics, and then the drawing is not sufficient; while the part without the network node can be fully heated to achieve a greater degree of drawing. Moreover, as the temperature of the GR1 hot roller group decreases, the difference in heating and drawing degree caused by the presence or absence of the network node will be more significant, which helps to more accurately control the fiber structure to meet the specific production needs.

[0030] In the prior art of FDY production, the temperature of the GR2 hot roller A is usually set to 125-145℃, and under this temperature condition, the boiling water shrinkage of the detected fiber is 6.0-8.0%. The present application innovatively improves the temperature of the GR2 hot roller A to 100-105℃, so that the overall boiling water shrinkage of the fiber is increased to 30.1-34.3%.

[0031] The setting of the temperature of the GR2 hot roller A is the key to low-temperature setting, which directly affects the boiling water shrinkage of the fiber. The present application adopts low-temperature setting because, compared with high-temperature setting, the fiber produced under low-temperature setting will exhibit higher shrinkage during later heat treatment. In order to achieve the ideal slub effect, the fiber needs to have higher thermal shrinkage performance. If the setting temperature is too high, the network node on the tow is easy to be fully heated, which reduces the difference in thermal shrinkage performance between the network node and the non-network node area, and the slub effect is not obvious. In addition, reducing the temperature of the GR2 hot roller A is also to cooperate with the process of small one-stage drawing and sufficient one-stage drawing when passing through the GR1 hot roller group, so that inconsistent shrinkage is generated in different parts. Using low-temperature heating can further expand this shrinkage difference, so that the slub effect produced is more significant.

[0032] The main network air pressure is 0.38-0.42MPa, which aims to improve the cohesion and improve the efficiency of the later weaving.

[0033] The preparation method of the high-density slub drawn yarn as described above, the tow contains 0.21-0.23wt% of the matting agent, and the specification of the tow is 50-61dtex / 24f.

[0034] The present application adds a delustering agent to the bundle, on the one hand, the delustering agent can impart delustering function to the bundle, on the other hand, the delustering agent is beneficial to improve the network degree of high-density slub drawn yarn, the specific principle is: in the mechanism of the networker, the high-speed compressed air flow vertically sprays the bundle, through violent impact and collision, vortex parallel to the bundle is formed, these vortexes promote the bundle to fully open, rotate and twist, and then make the network structure between the filaments, it is worth noting that the opening, rotation and twisting of the filaments in the bundle are closely related to the friction between the fibers, that is, the greater the friction coefficient between the fibers, the higher the difficulty of relative sliding, rotation and twisting between the filaments, and finally the network degree is also lower, based on the above principle, the present application particularly adds 0.21-0.23wt% delustering agent to the bundle, the specification of the bundle is 50-61dtex / 24f, the friction coefficient between the filaments is stabilized at 0.20-0.30, thereby ensuring that the network degree reaches 26-30 / m, that is, the slub density is 26-30 / m.

[0035] The preparation method of the high-density slub drawn yarn as described above, the slub density of the high-density slub drawn yarn is 26-30 / m, the elongation at break is 84-86%, the breaking strength is above 3.2cN / dtex, the boiling water shrinkage (shrinkage after boiling in 100℃ boiling water for 30min) is 30.1-34.3%, the slub length before the boiling water shrinkage test is 0.45-0.95cm, the slub length after the boiling water shrinkage test is 0.30-0.66cm, the downgraded rate of the hair yarn is ≤0.05%, the number of broken ends is ≤6 times / 18 positions·24 hours, and the network degree deviation is ≤4 / m.

[0036] The present application sets the pre-network air pressure at 0.38-0.45MPa, the higher air pressure will destroy the ordered arrangement of the macromolecules inside the fiber, resulting in the decrease of the orientation degree and crystallinity, on this basis, combined with the low temperature setting of 100-105℃ of the GR2 hot roller A, the boiling water shrinkage of the fiber reaches 30.1-34.3%.

[0037] Compared with the breaking strength of about 2.8cN / dtex recorded in patent application CN109594137A, the breaking strength of the high-density slub drawn yarn of the present application can break through 3.2cN / dtex, showing more excellent mechanical properties.

[0038] In terms of fabric effect, the high-density gap slub effect is mainly produced by shrinkage after heat treatment of the fabric. Whether it is warp knitting, weft knitting or circular knitting process, using the high-density slub drawn yarn of the present application can achieve this effect. However, the presentation of this effect has certain requirements for the density of the knitted fabric, such as mesh fabric, mosquito net fabric and other fabrics that do not need slub effect are not suitable. For conventional fabrics, the high-density slub drawn yarn of the present application can also exhibit high-density gap slub effect.

[0039] The production mechanism of the high-density slubbing drawn yarn is as follows: after the oiling and bundling of the fibers, a pre-networking process is directly performed, the air pressure of the pre-networking process is controlled at 0.38-0.45 MPa, and the fibers can form firm network nodes. When the yarn is stretched by the heating roller, the part with the network nodes cannot be fully stretched due to the structural hindrance, the contact with the heating roller and the insufficient heating, and the breaking elongation of the part is relatively high; the part without the network nodes is in full contact with the heating roller and is fully heated, and the part is more easily stretched, and the breaking elongation of the part is relatively low. Subsequently, the low-temperature setting process is performed, and the fibers as a whole have a relatively high shrinkage. Since the stretching orientation degree of the fibers with the network nodes is lower than that of the fibers without the network nodes, the shrinkage of the part with the network nodes is greater in the subsequent shrinkage process. The difference causes the fibers to naturally shrink to form the high-gap slubbing effect after the heat treatment after weaving, and a unique high-gap slubbing style fabric surface is presented. In addition, the network point length is controlled at about 0.5 cm by adjusting the network air pressure, the heating temperature and the stretching multiple. On this basis, the slubbing length is more reasonable, the slubbing length before shrinkage is 0.45-0.95 cm, the slubbing length after shrinkage reaches 0.30-0.66 cm, the slubbing density reaches 26-30 per meter, and the boiling water shrinkage is 30.1-34.3%. Compared with the existing technology in which the heating roller is used for slitting to cause the long slubbing length and the low slubbing density, the high-density high-gap slubbing effect of the short slubbing length and the high slubbing density is successfully achieved.

[0040] The application further provides a preparation method of irregular slubbing drawn yarn (i.e. the slubbing drawn yarn with irregular changes in the length and pitch of the slubs).

[0041] The pre-networker is supplied with air by the air supply device.

[0042] The air supply device comprises a driving mechanism and an air inlet pipe, a first fixed plate, a pressure conversion disc, a second fixed plate and an air outlet pipe arranged in sequence.

[0043] The first fixed plate is provided with an air inlet hole, the pressure conversion disc is provided with a plurality of air holes distributed around the center circumference, the diameters of the plurality of air holes are not completely the same, and the second fixed plate is provided with an air outlet hole; the plurality of air holes are alternately arranged along the outer circle on the pressure conversion disc, and the center of each hole has a chance to be on the same axis with the center points of the air inlet pipe and the air outlet pipe when the pressure conversion disc rotates; when the largest air hole is aligned with the air inlet pipe, the air outlet pressure is the largest, and when the smallest air hole is aligned with the air inlet pipe, the air outlet pressure is the smallest.

[0044] The outlet end of the air inlet pipe is connected with the air inlet hole, the inlet end of the air outlet pipe is connected with the air outlet hole, and the air outlet end of the air outlet pipe is connected with the air flow nozzle.

[0045] The first fixed plate, the variable pressure turntable and the second fixed plate are attached to each other, and the driving mechanism is used to drive the variable pressure turntable to rotate around its center at a constant speed, so as to make the plurality of air holes alternately communicate with the air inlet hole and the air outlet hole.

[0046] The slub silk refers to a kind of fiber with uneven appearance similar to bamboo joints. The conventional slub silk is that the joint length and pitch of the slub change periodically, so that the fiber forms a regular arrangement on the fabric surface. However, with the increasing requirements of consumers for polyester fabrics, the thick joints of the irregular slub silk will absorb more dye than the thin joints during fabric dyeing, so that the sliver presents irregular color changes of dark and light dyeing. At the same time, the irregular slub can protrude on the fabric surface, so that the fabric surface forms a special texture, produces a special color-changing fabric style, and can meet the requirements of people for fabric style diversification.

[0047] The existing technology generally produces irregular slub filament by reducing the number of winding turns of the filament on the hot roller. For example, the patent with the publication number CN101748502B discloses an FDY polyester slub filament and a preparation method. The number of winding turns on the drafting roller is reduced from 7 to 2, so that it is easy to slip between the drafting roller and the setting roller and better produce uneven stretching. However, due to the low temperature of the drafting roller, the required heat during stretching cannot be achieved, and the use of fewer winding turns is prone to cause problems such as lint and winding on the roller, resulting in production difficulties, and even the filament cannot be wound into a shape.

[0048] As a preferred technical solution:

[0049] The preparation method of the irregular slub drafting filament as described above, the inlet hole, the outlet hole and the air hole are all round holes; the hole diameter of the inlet hole and the outlet hole is 25mm, the maximum hole diameter of the plurality of air holes is 25mm, the minimum hole diameter is 6.25mm, and the other hole diameters are 12.5mm or 18.75mm.

[0050] The preparation method of the irregular slub drafting filament as described above, the first fixed plate, the variable pressure turntable and the second fixed plate are all round plates, and the center axes of the three are coincident.

[0051] The preparation method of the irregular slub drafting filament as described above, the gas supply device further comprises a turntable shell, the turntable shell is a circular tubular structure, the first fixed plate and the second fixed plate are respectively fixedly connected with both ends of the turntable shell, and the variable pressure turntable is located in the interior of the turntable shell and gap-fitted therewith.

[0052] The preparation method of the irregular slub drafting filament as described above, the driving mechanism comprises a turntable shaft and simultaneously located driving gears, driving gears, a gearbox, a motor and a frequency converter outside the turntable shell, and a turntable shaft sealing ring is installed between the turntable shaft and the turntable shell;

[0053] One end of the rotating disc shaft passes through the first fixed plate and is fixedly connected with the variable pressure rotating disc, the driven gear is fixedly sleeved on the rotating disc shaft and is engaged with the driving gear, the driving gear is fixedly sleeved on the output shaft of the gearbox, the gearbox, the motor and the frequency converter are sequentially connected, and the frequency converter is electrically connected with the motor; the frequency converter outputs a certain current, the motor rotates, the driving gear is driven to rotate through the gearbox, the driving gear drives the driven gear to rotate, since the variable pressure rotating disc is connected with the driven gear through the rotating disc shaft, the variable pressure rotating disc and the driven gear rotate synchronously, the air holes of different sizes on the variable pressure rotating disc alternately align with the shaft centers of the air inlet pipe and the air outlet pipe, when air pressure enters, the air outlet pipe will cause the air outlet pressure to change due to the air holes of different sizes alternately rotating.

[0054] The preparation method of the irregular slubbing drafting yarn as described above, the oiling adopts an oil nozzle;

[0055] The air inlet pressure of the air inlet pipe is constant, and the value range is 0.38-0.45 MPa;

[0056] The pre-networker is an equal-section vertical plate, a certain cross section of the pre-networker passes through the airflow nozzle, the cross section is an Archimedes spiral, the polar angle of the Archimedes spiral is greater than 360° and less than 450°, the airflow nozzle is located at a position with a polar angle of 180° on the Archimedes spiral, and the airflow nozzle faces the center of the Archimedes spiral;

[0057] The guide hooks at the inlet and outlet of the pre-networker are groove-shaped guide hooks, the groove-shaped guide hook is composed of a U-shaped guide hook and a limiting block, the U-shaped guide hook is horizontally arranged, the limiting block is connected with the inner wall of the U-shaped guide hook, and is used for limiting the fiber bundle in the bottom region of the U-shaped guide hook; the fiber bundle passes through the bottom region of the upper groove-shaped guide hook, the center position of the pre-networker and the bottom region of the lower groove-shaped guide hook in sequence from top to bottom.

[0058] The preparation method of the irregular slubbing drafting yarn as described above, the Archimedes spiral coefficient of the Archimedes spiral is 1-2 mm / °, the polar radius when the polar angle is 0° is 1.5-2 mm; the airflow nozzle is a circular hole with a diameter of 1.1-1.3 mm, the airflow nozzle is located at the middle position of the pre-networker along the vertical direction; along the vertical direction, the length of the pre-networker is 23-27 mm.

[0059] The preparation method of the irregular slubbing drafting yarn as described above, the distance between each groove-shaped guide hook and the pre-networker along the vertical direction is 13-17 mm; the angle a between the fiber bundle at the upper groove-shaped guide hook and the vertical direction is 5-10°; the angle β between the fiber bundle at the lower groove-shaped guide hook and the vertical direction is 5-10°.

[0060] The preparation method of the irregular slubbing drawn yarn as described above, the air flow injection holes of the pre-networkers of each spinning position are connected with the air outlet ends of the air outlet pipes of a gas supply device, the inlet ends of the air inlet pipes of all the gas supply devices are communicated with the same main pipeline, and an automatic pressure regulating valve is arranged on the air inlet end of the main pipeline.

[0061] The preparation method of the irregular slubbing drawn yarn as described above, the drawing setting adopts a GR1 hot roller group and a GR2 hot roller group, the linear speed of the GR1 hot roller group is 1500-1640 m / min, the linear speed of the GR2 hot roller group is 2850-3000 m / min, and the draw ratio is 1.75-1.9 times.

[0062] The preparation method of the irregular slubbing drawn yarn as described above, the GR1 hot roller group is composed of a GR1 hot roller A and a GR1 hot roller B, the temperature of the GR1 hot roller group is 55-65℃, the GR2 hot roller group is composed of a GR2 hot roller A and a GR2 roller B, and the temperature of the GR2 hot roller A is 100-105℃.

[0063] The main network adopts a main networker.

[0064] The surface roughness of the GR1 hot roller A is uniform and is 0.05 μm; the surface roughness of the GR1 hot roller B is uniform and is 0.05 μm; the surface roughness of the GR2 hot roller A is uniform and is 0.9±0.05 μm; and the surface roughness of the GR2 roller B is uniform and is 0.9±0.05 μm.

[0065] The GR1 hot roller A, the GR1 hot roller B, the GR2 hot roller A and the GR2 roller B are all cylindrical structures, the diameters of the GR1 hot roller A, the GR1 hot roller B and the GR2 hot roller A are all 220 mm, and the diameter of the GR2 roller B is 110 mm.

[0066] The winding turns of the yarn on the GR1 hot roller group and the GR2 hot roller group are both 4.5-5.5.

[0067] The preparation method of the irregular slubbing drawn yarn as described above, the air pressure of the main network is 0.38-0.42 MPa.

[0068] The preparation method of the irregular slubbing drawn yarn as described above, the yarn contains 0.21-0.23 wt% of a matting agent, and the specification of the yarn is 50-61 dtex / 24 f.

[0069] The preparation method of the irregular slubbing drawn yarn as described above, the breakage frequency of the irregular slubbing drawn yarn is 3.5-4.6 times / 18 positions·24 hours, and the downgrading rate of the hairiness is 0.02-0.03%.

[0070] Beneficial effects:

[0071] (1) In terms of air pressure control, the pre-network air pressure is set to 0.38-0.45 MPa, effectively increasing the firmness and density of the network nodes, and further improving the slub density; at the same time, an automatic pressure regulating valve is arranged at the air inlet end of the main pipeline to adjust the air pressure of the main pipeline in real time, ensuring that the pre-network air pressure of each spinning position is stable within the process design range and ensuring production quality.

[0072] (2) In the fiber treatment link, the oil nozzle oiling method is adopted, so that the oiling fiber filaments have good mutual adhesion, and the bundling and oiling operations are completed synchronously, avoiding problems such as hairiness, broken ends, uneven network points and difficult to start, etc. caused by the increase of pre-network air pressure; the pre-networker with an Archimedes spiral structure is used to enhance the cohesion of the fiber filaments in the pre-networker, stabilize the network nodes, reduce hairiness and broken ends, and improve the fiber breaking strength; the fiber bundle is fixed at the middle position of the pre-networker by two recessed guide hooks, ensuring that the fiber bundle is evenly stressed after entering the pre-networker.

[0073] (3) In terms of temperature control, the temperature of the GR1 hot roller group is set to 55-65℃, which cooperates with the operation before the drawing process to promote the formation of firm network nodes; the temperature of the GR2 hot roller A is reduced to 100-105℃, so that the overall fiber boiling water shrinkage is increased to 30.1-34.3%, and the slub effect is more significant.

[0074] (4) The high-density slub drawn yarn produced by the present application has a slub density of 26-30 / m, a breaking strength of more than 3.2 cN / dtex, excellent mechanical properties, and when applied to conventional fabrics, it can exhibit high-density gap slub effect. BRIEF DESCRIPTION OF DRAWINGS

[0075] Figure 1 is a schematic diagram of the pre-networker of the present application; in the figure, the dashed circle is an air flow jet hole;

[0076] Figure 2 is a schematic diagram of the cross section of the conventional pre-networker in the prior art, and b is a schematic diagram of the cross section of the pre-networker of the present application; the black bold arrow in the figure indicates the pre-network air flow direction;

[0077] Figure 3 is a schematic diagram of the recessed guide hook of the present application;

[0078] Figure 4 is a schematic diagram of the preparation device of the high-density slub drawn yarn of the present application;

[0079] Figure 5 is a schematic diagram of the gas supply device of the present application;

[0080] Figure 6 is a schematic diagram of the position between the first fixed plate, the pressure changing turntable and the second fixed plate of the present application; in the figure, A represents the center axis;

[0081] Figure 7 Schematic diagram of the gas inlet pipe, gas outlet pipe and rotating disc shell of the present application;

[0082] Figure 8 Schematic diagram of the first fixed plate of the present application;

[0083] Figure 9 Schematic diagram of the variable-pressure rotating disc of the present application, embodiment B1 and embodiment B2;

[0084] Figure 10 Schematic diagram of the hole diameter and arrangement of the air holes in embodiment B1 of the present application;

[0085] Figure 11 Schematic diagram of the variable-pressure rotating disc of the present application, embodiment B3 and embodiment B4;

[0086] Figure 12 Schematic diagram of the variable-pressure rotating disc of the present application, embodiment B5; Figures 9-12 In the figure, d1 represents an air hole with a diameter of 6.25 mm, d2 represents an air hole with a diameter of 12.5 mm, d3 represents an air hole with a diameter of 18.75 mm, and d4 represents an air hole with a diameter of 25 mm;

[0087] In the figure, 1 is the gas outlet pipe, 2 is the gas inlet pipe, 3 is the rotating disc shell, 4 is the driven gear, 5 is the rotating disc shaft, 6 is the gearbox, 7 is the motor, 8 is the frequency converter, 9 is the driving gear, 10 is the gas outlet hole, 11 is the gas inlet hole, 12 is the variable-pressure rotating disc, 13 is the shaft hole, 14 is the air hole, 15 is the spinning duct, 16 is the oil nozzle, 17 is the recessed groove-shaped guide hook located on the upper side, 17.1 is the U-shaped guide hook, 17.2 is the limiting block, 18 is the pre-networker, 19 is the recessed groove-shaped guide hook located on the lower side, 20 is the GR1 hot roller A, 21 is the GR1 hot roller B, 22 is the GR2 hot roller A, 23 is the GR2 hot roller B, 24 is the main networker, and 25 is the tow. DETAILED DESCRIPTION

[0088] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. Furthermore, it should be understood that those skilled in the art can make various modifications or changes to the present application after reading the content taught by the present application, and these equivalent forms also fall within the scope defined by the claims of the present application.

[0089] The test methods of the relevant performance indicators in the following examples and comparative examples are as follows:

[0090] Bamboo joint density: the number of bamboo joints of the high-density bamboo joint drawn yarn within one meter is observed by appearance.

[0091] Elongation at break, breaking strength: the high-density slub drawn yarns prepared in each example were taken as samples, and then the samples were measured by a full-automatic single yarn strength machine (model YG023B-II) according to the standard GB / T 14344-2022 “Chemical fiber filament tensile property test method”, the specific process was as follows: first, the sample was placed in an environment with a temperature of 20 ℃ and a humidity of 65% for 4 h, then it was clamped by upper and lower clamps (the clamping length was 500 mm), and a pre-tension of 0.05 cN / dtex was applied by a mechanical hand to stabilize the sample, when starting the test, the lower clamp stretched the sample at a speed of 500 mm / min, until the sample broke, while recording the real-time data of the force sensor during the stretching process, and drawing the relationship curve between the strength and the elongation by the data collection system, finally, the breaking strength and the elongation at break of the sample were obtained by data processing and analysis.

[0092] Boiling water shrinkage: the boiling water shrinkage of the sample was tested by the skein method according to the standard GB / T 6505-2017 “Chemical fiber filament heat shrinkage test method (after treatment)”, the sample was treated by boiling water, and the sample length before boiling water treatment and the sample length after boiling water treatment were measured, and the boiling water shrinkage was calculated according to the following formula:

[0093] Boiling water shrinkage = (sample length before boiling water treatment - sample length after boiling water treatment) x 100% / sample length before boiling water treatment.

[0094] Slub length before boiling water shrinkage test: the slub length within 1 meter was measured by a ruler, and the average value was taken.

[0095] Slub length after boiling water shrinkage test: after the boiling water shrinkage test, the slub length within 1 meter was measured by a ruler, and the average value was taken.

[0096] Fluff downgrading rate: the high-density slub drawn yarns prepared in each example were wound to obtain a cake, and the cake was taken as a sample, the downgrading of the cake was determined according to whether the number of broken filament defects on the surface of the cake was more than 2, and the cake was downgraded if the number of broken filament defects was more than 2, then the fluff downgrading rate was obtained by the calculation formula, the calculation formula was: fluff downgrading rate = fluff downgrading number x 100% / total number.

[0097] Network density deviation: Network density deviation = |Measured network density - Standard network density value|. The measured network density is determined according to the standard "Test Method for Network Density of Synthetic Fiber Filaments" (FZ / T 50001-2016). The sample is adjusted to a suitable tension through a pre-tensioning system, and the splitting needle is slowly moved in the filament of a specified length. When the network node hits the splitting needle, the needle stops moving. The number of network nodes calculated at this time is the measured network density. The standard network density value refers to the target reference value of the number of network nodes per unit length (per meter) that is set in advance according to product requirements, industry specifications or enterprise standards.

[0098] Example A1

[0099] A method for preparing high-density bamboo-joint drawn fibers, the specific process of which is as follows:

[0100] A matting agent (titanium dioxide) was added to a PET melt with an intrinsic viscosity of 0.62 dL / g (PET is obtained from PTA and EG through esterification and polycondensation, with PTA content in the reactants being 69 wt%). The melt was then extruded from the spinneret's orifice (circular cross-section) and cooled to obtain a filament bundle with a specification of 50 dtex / 24f (the filament bundle contained 0.21 wt% matting agent). Subsequently, as... Figure 4 As shown, the obtained filament bundle 25 is sequentially passed through the oil nozzle 16, the spinning channel 15 (which serves to resist interference and stabilize airflow), the bottom area of ​​the upper grooved guide hook 17, the center of the pre-networker 18, and the bottom area of ​​the lower grooved guide hook 19, and then sequentially undergoes drawing and shaping, main networking, and winding to obtain high-density slub-joint drawn filament; wherein:

[0101] like Figure 1 , Figure 2 As shown in Figure b, the pre-networker 18 is a vertical plate with a uniform cross-section, on which horizontally arranged airflow nozzles are provided. The airflow nozzles are circular holes with a diameter of 1.1 mm. In the vertical direction, the airflow nozzles are located in the middle position of the pre-networker 18.

[0102] A certain cross section of the pre-networker 18 passes through the airflow nozzle. The cross section is an Archimedean spiral with a polar angle of 360°. The airflow nozzle is located at a position on the Archimedean spiral with a polar angle of 180° and faces the center of the Archimedean spiral.

[0103] The Archimedean spiral has an Archimedean spiral coefficient of 1 mm / ° and a polar diameter of 1.5 mm when the polar angle is 0°.

[0104] The upper grooved guide hook 17 and the lower grooved guide hook 19 have the same structure and dimensions, such as... Figure 3 , Figure 4As shown, the upper recess-shaped guide wire hook 17 is composed of a U-shaped guide wire hook 17.1 and a limiting block 17.2, the U-shaped guide wire hook 17.1 is horizontally arranged, and the limiting block 17.2 is connected with the inner wall of the U-shaped guide wire hook 17.1, for limiting the fiber bundle 25 in the bottom area of the U-shaped guide wire hook 17.1;

[0105] In the vertical direction, the distance between the upper recess-shaped guide wire hook 17 and the pre-networker 18 is 13 mm, and the length of the pre-networker 18 is 23 mm;

[0106] The angle α between the fiber bundle 25 and the vertical direction at the upper recess-shaped guide wire hook 17 is 5°, and the angle β between the fiber bundle 25 and the vertical direction at the lower recess-shaped guide wire hook 19 is 5°;

[0107] The airflow injection hole of each pre-networker 18 is communicated with a branch pipe, all the branch pipes are communicated with the same main pipe, and an automatic pressure regulating valve is arranged on the air inlet end of the main pipe;

[0108] The pre-networking air pressure is constant at 0.38 MPa;

[0109] As shown, Figure 4 the drafting and setting adopts a GR1 hot roller group and a GR2 hot roller group, the GR1 hot roller group is composed of a GR1 hot roller A 20 and a GR1 hot roller B 21, and the GR2 hot roller group is composed of a GR2 hot roller A 22 and a GR2 roller B 23; the surface roughness of the GR1 hot roller A 20 is uniform, and the value is 0.05 μm; the surface roughness of the GR1 hot roller B 21 is uniform, and the value is 0.05 μm; the surface roughness of the GR2 hot roller A 22 is uniform, and the value is 0.85 μm; and the surface roughness of the GR2 roller B 23 is uniform, and the value is 0.85 μm;

[0110] The GR1 hot roller A 20, the GR1 hot roller B 21, the GR2 hot roller A 22 and the GR2 roller B 23 all have a cylindrical structure, the diameters of the GR1 hot roller A 20, the GR1 hot roller B 21 and the GR2 hot roller A 22 are all 220 mm, and the diameter of the GR2 roller B 23 is 110 mm;

[0111] The temperature of the GR1 hot roller A 20 and the GR1 hot roller B 21 is both 55℃, and the linear speed is both 1500 m / min; the temperature of the GR2 hot roller A 22 is 100℃, the linear speed of the GR2 hot roller A 22 and the GR2 roller B 23 is both 2850 m / min, and the drafting multiple is 1.9 times;

[0112] The winding number of the fiber bundle 25 on the GR1 hot roller group and the GR2 hot roller group is both 5.5;

[0113] The main network adopts a main network device 24, and the main network pressure is 0.38 MPa.

[0114] The finally prepared high-density slubbing drawn yarn has a slub density of 26 / m, an elongation at break of 84%, a breaking strength of 3.45 cN / dtex, a boiling water shrinkage of 30.1%, a slub length before the boiling water shrinkage test of 0.95 cm, a slub length after the boiling water shrinkage test of 0.66 cm, a downgrading rate of 0.05%, a number of broken ends of 6 times / 18 positions·24 hours, and a network degree deviation of 3 / m (a network degree standard value is 29 / m).

[0115] Comparative Example 1

[0116] A method for preparing a slubbing drawn yarn, which is basically the same as that of Example 1, except that the polar angle of the Archimedes spiral is 350°.

[0117] The finally prepared slubbing drawn yarn has a slub density of 23 / m, a downgrading rate of 0.08%, and a number of broken ends of 7.1 times / 18 positions·24 hours.

[0118] Comparing Comparative Example 1 with Example 1, it can be seen that the slub density of the slubbing drawn yarn prepared in the former is reduced, and the downgrading rate and the number of broken ends are increased. This is because when the polar angle of the Archimedes spiral is 350°, a larger network pressure is discharged from the network device earlier, thereby reducing the network degree, and further affecting the slub density. In addition, since the air pressure is discharged earlier, the air pressure in the inner chamber is unstable, and the yarn is prone to rubbing against the edge of the pre-network device, thereby increasing the downgrading rate and the number of broken ends.

[0119] Comparative Example 2

[0120] A method for preparing a slubbing drawn yarn, which is basically the same as that of Example 1, except that the polar angle of the Archimedes spiral is 460°.

[0121] The finally prepared slubbing drawn yarn has a downgrading rate of 0.09% and a number of broken ends of 9.6 times / 18 positions·24 hours.

[0122] Comparing Comparative Example 2 with Example 1, it can be seen that the downgrading rate and the number of broken ends of the slubbing drawn yarn prepared in the former are increased. This is because when the polar angle of the Archimedes spiral is 460°, a larger network pressure cannot be discharged from the network device in time, so that the airflow in the network device is turbulent, thereby increasing the downgrading rate and the number of broken ends.

[0123] Comparative Example 3

[0124] A method for preparing a slubbing drawn yarn, which is basically the same as that of Example 1, except that the airflow nozzle is located at a position with a polar angle of 170° on the Archimedes spiral.

[0125] The slub density of the slub drawn yarn finally prepared is 24 / m, the down grade rate of hairiness is 0.07%, and the number of broken ends is 7.3 times / 18 positions·24 hours.

[0126] Comparing the comparative example 3 with the example 1, it can be found that the slub density of the slub drawn yarn prepared in the comparative example 3 is reduced, and the down grade rate of hairiness and the number of broken ends are increased. This is because the air flow nozzle is located at the position of 170° of the polar angle on the Archimedes spiral, which is easy to cause the pre-network air flow to directly enter another spiral after being blown to the yarn bundle, thereby causing the instability of the air pressure in the inner chamber, reducing the slub density, and also causing the yarn bundle to easily rub against the edge of the pre-networker, thereby increasing the number of hairiness and broken ends.

[0127] Comparative example 4

[0128] A method for preparing a slub drawn yarn, which is basically the same as the example 1, except that the air flow nozzle is located at the position of 190° of the polar angle on the Archimedes spiral.

[0129] The down grade rate of hairiness of the slub drawn yarn finally prepared is 0.09%, and the number of broken ends is 8.9 times / 18 positions·24 hours.

[0130] Comparing the comparative example 4 with the example 1, it can be found that the down grade rate of hairiness and the number of broken ends of the slub drawn yarn prepared in the comparative example 4 are increased. This is because the air flow nozzle is located at the position of 190° of the polar angle on the Archimedes spiral, i.e. at the left side of the center of the Archimedes spiral, which is easy to cause the larger network air pressure to not be discharged in time in the networker, causing the air flow in the networker to be turbulent, thereby increasing the number of hairiness and broken ends.

[0131] Comparative example 5

[0132] A method for preparing a slub drawn yarn, which is basically the same as the example 1, except that the recess-shaped guide hook located above and the recess-shaped guide hook located below are both replaced by a U-shaped guide hook.

[0133] The down grade rate of hairiness of the slub drawn yarn finally prepared is 0.09%, the number of broken ends is 9.1 times / 18 positions·24 hours, and the network degree deviation is 5 / m (the standard value of network degree is 29 / m).

[0134] Comparing the comparative example 5 with the example 1, it can be found that the down grade rate of hairiness, the number of broken ends, and the network degree deviation of the slub drawn yarn prepared in the comparative example 5 are increased. This is because the angle of the yarn bundle before and after the pre-networker is large, and the use of the U-shaped guide hook will cause the yarn bundle to not be locked at the middle position of the pre-networker under the larger pre-network air pressure, thereby causing the inconsistent stress points and uneven network points. In addition, the inconsistent stress points will also cause the yarn bundle to more easily rub against the edge of the pre-networker, thereby increasing the number of hairiness and broken ends.

[0135] Example A2

[0136] A method for preparing high-density slubbing drawn yarn, the specific process is as follows:

[0137] PET melt (PET is prepared from PTA and EG through esterification and polycondensation reaction, the content of PTA in the reaction raw material is 70wt%) with intrinsic viscosity of 0.623dL / g is added with matting agent (titanium dioxide), and then is sprayed from the spinneret hole (cross section is circular) of the spinneret, and after cooling and setting, a 55dtex / 24f yarn is obtained (the content of matting agent in the yarn is 0.22wt%), then the yarn passes through oil nozzle, spinning duct, the bottom area of the recess-shaped guide hook located at the upper side, the central position of the pre-networker and the bottom area of the recess-shaped guide hook located at the lower side in sequence, and after the processes of drawing and setting, main network and winding in sequence, high-density slubbing drawn yarn is obtained; wherein:

[0138] The pre-networker is an equal cross-section vertical plate, and airflow nozzles are arranged horizontally on the plate, the airflow nozzles are circular holes with a diameter of 1.2mm, and along the vertical direction, the airflow nozzles are located at the middle position of the pre-networker;

[0139] A certain cross section of the pre-networker passes through the airflow nozzles, the cross section is an Archimedes spiral, the polar angle of the Archimedes spiral is 400°, the airflow nozzles are located at the position with a polar angle of 180° on the Archimedes spiral, and the airflow nozzles are directed to the center of the Archimedes spiral;

[0140] The Archimedes helix coefficient of the Archimedes spiral is 1.5mm / °, and the polar radius at the polar angle of 0° is 1.8mm;

[0141] The recess-shaped guide hook located at the upper side and the recess-shaped guide hook located at the lower side are completely the same in structure and size, the recess-shaped guide hook located at the upper side is composed of a U-shaped guide hook and a limiting block, the U-shaped guide hook is horizontally arranged, and the limiting block is connected with the inner wall of the U-shaped guide hook and is used for limiting the yarn in the bottom area of the U-shaped guide hook;

[0142] Along the vertical direction, the distance between the recess-shaped guide hook located at the upper side and the recess-shaped guide hook located at the lower side and the pre-networker is 15mm, and the length of the pre-networker is 25mm;

[0143] The included angle α between the yarn and the vertical direction at the recess-shaped guide hook located at the upper side is 8°, and the included angle β between the yarn and the vertical direction at the recess-shaped guide hook located at the lower side is 8°;

[0144] The airflow nozzles of the pre-networkers of all spinning positions are communicated with a branch pipe respectively, all the branch pipes are communicated with a same main pipe, and an automatic pressure regulating valve is arranged on the gas inlet end of the main pipe;

[0145] The pre-network air pressure is constant at 0.4 MPa;

[0146] The drafting and setting adopts a GR1 hot roller set and a GR2 hot roller set, the GR1 hot roller set is composed of a GR1 hot roller A and a GR1 hot roller B, and the GR2 hot roller set is composed of a GR2 hot roller A and a GR2 roller B; the circumferential surface roughness of the GR1 hot roller A is uniform and has a value of 0.05 μm; the circumferential surface roughness of the GR1 hot roller B is uniform and has a value of 0.05 μm; the circumferential surface roughness of the GR2 hot roller A is uniform and has a value of 0.9 μm; and the circumferential surface roughness of the GR2 roller B is uniform and has a value of 0.9 μm;

[0147] The GR1 hot roller A, the GR1 hot roller B, the GR2 hot roller A and the GR2 roller B all have a cylindrical structure, the diameters of the GR1 hot roller A, the GR1 hot roller B and the GR2 hot roller A are all 220 mm, and the diameter of the GR2 roller B is 110 mm;

[0148] The temperatures of the GR1 hot roller A and the GR1 hot roller B are both 58 ℃, the linear speeds of the GR1 hot roller A and the GR1 hot roller B are both 1550 m / min, the temperature of the GR2 hot roller A is 103 ℃, and the linear speeds of the GR2 hot roller A and the GR2 roller B are both 2900 m / min; the drafting multiple is 1.87 times;

[0149] The winding turns of the filament on the GR1 hot roller set and the GR2 hot roller set are both 5.5;

[0150] The main network adopts a main network device, and the main network air pressure is 0.4 MPa.

[0151] The finally prepared high-density slubbing drafting filament has a slub density of 28 / m, an elongation at break of 84.3%, a breaking strength of 3.37 cN / dtex, a boiling water shrinkage of 32.5%, a slub length before the boiling water shrinkage test of 0.53 cm, a slub length after the boiling water shrinkage test of 0.36 cm, a downgrading rate of 0.04%, a number of breakages of 5.9 times / 18 positions·24 hours, and a network degree deviation of 2 / m (the standard value of the network degree is 30 / m).

[0152] Example A3

[0153] A method for preparing a high-density slubbing drafting filament, and the specific process is as follows:

[0154] After adding matting agent (titanium dioxide) into PET melt (PET is prepared from PTA and EG through esterification and polycondensation reaction, the content of PTA in reaction raw materials is 71wt%), the PET melt is extruded from the spinneret hole (cross section is circular) of the spinneret, and the 59dtex / 24f yarn is obtained after cooling and setting, then the yarn passes through oil nozzle, spinning duct, the bottom area of the recessed guide hook located at the upper side, the central position of the pre-networker and the bottom area of the recessed guide hook located at the lower side in turn, and high-density slubbing drawn yarn is obtained after drafting and setting, main network and winding in turn; wherein:

[0155] The pre-networker is an equal cross-section vertical plate, and airflow nozzles are arranged horizontally on the pre-networker, the airflow nozzles are circular holes with a diameter of 1.3mm, and the airflow nozzles are located at the middle position of the pre-networker in the vertical direction;

[0156] A certain cross section of the pre-networker passes through the airflow nozzles, the cross section is an Archimedes spiral, the polar angle of the Archimedes spiral is 450°, the airflow nozzles are located at the position with a polar angle of 180° on the Archimedes spiral, and the airflow nozzles are directed to the center of the Archimedes spiral;

[0157] The Archimedes helix coefficient of the Archimedes spiral is 2mm / °, and the polar radius at the polar angle of 0° is 2mm;

[0158] The recessed guide hook located at the upper side and the recessed guide hook located at the lower side are completely the same in structure and size, the recessed guide hook located at the upper side is composed of a U-shaped guide hook and a limiting block, the U-shaped guide hook is horizontally arranged, and the limiting block is connected with the inner wall of the U-shaped guide hook and is used for limiting the yarn in the bottom area of the U-shaped guide hook;

[0159] In the vertical direction, the distance between the recessed guide hook located at the upper side and the recessed guide hook located at the lower side and the pre-networker is 17mm, and the length of the pre-networker is 27mm;

[0160] The included angle α between the yarn and the vertical direction at the recessed guide hook located at the upper side is 10°, and the included angle β between the yarn and the vertical direction at the recessed guide hook located at the lower side is 10°;

[0161] The airflow nozzles of the pre-networker of each spinning position are communicated with a branch pipe respectively, all the branch pipes are communicated with the same main pipe, and an automatic pressure regulating valve is arranged on the gas inlet end of the main pipe;

[0162] The pre-networking air pressure is constant at 0.45MPa;

[0163] The drafting and setting adopts a GR1 hot roller set and a GR2 hot roller set, the GR1 hot roller set is composed of a GR1 hot roller A and a GR1 hot roller B, and the GR2 hot roller set is composed of a GR2 hot roller A and a GR2 roller B; the peripheral roughness of the GR1 hot roller A is uniform and has a value of 0.05 μm; the peripheral roughness of the GR1 hot roller B is uniform and has a value of 0.05 μm; the peripheral roughness of the GR2 hot roller A is uniform and has a value of 0.95 μm; and the peripheral roughness of the GR2 roller B is uniform and has a value of 0.95 μm;

[0164] The GR1 hot roller A, the GR1 hot roller B, the GR2 hot roller A and the GR2 roller B all have a cylindrical structure, the diameter of the GR1 hot roller A, the GR1 hot roller B and the GR2 hot roller A is 220 mm, and the diameter of the GR2 roller B is 110 mm;

[0165] The temperature of the GR1 hot roller A and the GR1 hot roller B is 60 °C, the linear speed of the GR1 hot roller A and the GR1 hot roller B is 1600 m / min, the temperature of the GR2 hot roller A is 105 °C, and the linear speed of the GR2 hot roller A and the GR2 roller B is 3000 m / min, and the drafting multiple is 1.88 times;

[0166] The main network adopts a main network device, and the air pressure of the main network is 0.42 MPa;

[0167] The winding turns of the filament on the GR1 hot roller set and the GR2 hot roller set are both 5.5.

[0168] The final prepared high-density slubbing drafting filament has a slub density of 30 per meter, an elongation at break of 84.9%, a breaking strength of 3.41 cN / dtex, a boiling water shrinkage of 33.7%, a slub length before the boiling water shrinkage test of 0.52 cm, a slub length after the boiling water shrinkage test of 0.34 cm, a downgrading rate of 0.03%, a number of broken ends of 4.8 times per 18 positions per 24 hours, and a network degree deviation of 1 per meter (the standard value of the network degree is 29 per meter).

[0169] Example A4

[0170] A method for preparing a high-density slubbing drafting filament, and the specific process is as follows:

[0171] After adding a matting agent (titanium dioxide) into a PET melt (PET is prepared from PTA and EG through esterification and polycondensation reaction, the content of PTA in the reaction raw materials is 70.5wt%) with an intrinsic viscosity of 0.633dL / g, the PET melt is extruded from the spinneret holes (cross section is circular) of a spinneret, and is cooled and set to obtain a 60dtex / 24f yarn (the content of the matting agent in the yarn is 0.21wt%) which is then subjected to an oil nozzle, a spinning duct, the bottom region of the recess-shaped guide hook located at the upper side, the central position of the pre-networking device and the bottom region of the recess-shaped guide hook located at the lower side in sequence, and is then subjected to drafting and setting, main networking and winding in sequence to obtain a high-density slubbing drawn yarn; wherein:

[0172] The pre-networking device is an equal cross-section vertical plate, and a gas flow jet hole arranged horizontally is arranged on the pre-networking device, the gas flow jet hole is a circular hole with a diameter of 1.3mm, and in the vertical direction, the gas flow jet hole is located at the middle position of the pre-networking device;

[0173] A certain cross section of the pre-networking device passes through the gas flow jet hole, the cross section is an Archimedes spiral, the polar angle of the Archimedes spiral is 450°, the gas flow jet hole is located at the position with a polar angle of 180° on the Archimedes spiral, and the gas flow jet hole faces the center of the Archimedes spiral;

[0174] The Archimedes helix coefficient of the Archimedes spiral is 1.8mm / °, and the polar radius at a polar angle of 0° is 1.7mm;

[0175] The recess-shaped guide hook located at the upper side and the recess-shaped guide hook located at the lower side are completely the same in structure and size, the recess-shaped guide hook located at the upper side is composed of a U-shaped guide hook and a limiting block, the U-shaped guide hook is arranged horizontally, the limiting block is connected with the inner wall of the U-shaped guide hook, and is used for limiting the yarn in the bottom region of the U-shaped guide hook;

[0176] In the vertical direction, the distance between the recess-shaped guide hook located at the upper side and the recess-shaped guide hook located at the lower side and the pre-networking device is 15mm, and the length of the pre-networking device is 25mm;

[0177] The included angle α between the yarn and the vertical direction at the recess-shaped guide hook located at the upper side is 8°, and the included angle β between the yarn and the vertical direction at the recess-shaped guide hook located at the lower side is 8°;

[0178] The gas flow jet hole of each pre-networking device is communicated with a branch pipe, all the branch pipes are communicated with a same main pipe, and an automatic pressure regulating valve is arranged on the gas inlet end of the main pipe;

[0179] The pre-networking gas pressure is constant at 0.43MPa;

[0180] The draft setting is adopted by GR1 hot roller group and GR2 hot roller group, the GR1 hot roller group is composed of GR1 hot roller A and GR1 hot roller B, and the GR2 hot roller group is composed of GR2 hot roller A and GR2 roller B; the peripheral roughness of the GR1 hot roller A is uniform, and the value is 0.05 μm; the peripheral roughness of the GR1 hot roller B is uniform, and the value is 0.05 μm; the peripheral roughness of the GR2 hot roller A is uniform, and the value is 0.9 μm; the peripheral roughness of the GR2 roller B is uniform, and the value is 0.9 μm;

[0181] The GR1 hot roller A, the GR1 hot roller B, the GR2 hot roller A and the GR2 roller B are all cylindrical structures, the diameters of the GR1 hot roller A, the GR1 hot roller B and the GR2 hot roller A are all 220 mm, and the diameter of the GR2 roller B is 110 mm;

[0182] The temperatures of the GR1 hot roller A and the GR1 hot roller B are both 61 ℃, the linear speeds of the GR1 hot roller A and the GR1 hot roller B are both 1640 m / min, the temperature of the GR2 hot roller A is 104 ℃, and the linear speeds of the GR2 hot roller A and the GR2 roller B are both 2870 m / min, and the draft multiple is 1.75 times;

[0183] The main network adopts a main network device, and the air pressure of the main network is 0.41 MPa;

[0184] The winding turns of the filament on the GR1 hot roller group and the GR2 hot roller group are both 4.5.

[0185] The final prepared high-density slub draft yarn has a slub density of 28 / m, an elongation at break of 86%, a breaking strength of 3.25 cN / dtex, a boiling water shrinkage of 34.1%, a slub length of 0.45 cm before the boiling water shrinkage test, a slub length of 0.3 cm after the boiling water shrinkage test, a downgraded hair rate of 0.04%, a number of broken ends of 3.9 times / 18 positions·24 hours, and a network degree deviation of 2 / m (the standard value of the network degree is 30 / m).

[0186] Example A5

[0187] A preparation method of high-density slub draft yarn, and the specific process is as follows:

[0188] After adding a matting agent (titanium dioxide) into a PET melt (PET is prepared from PTA and EG through esterification and polycondensation reaction, the content of PTA in the reaction raw materials is 70wt%) with an intrinsic viscosity of 0.635dL / g, the PET melt is extruded from the spinneret holes (the cross section is circular) of a spinneret, and is cooled and set to obtain a 61dtex / 24f yarn (the content of the matting agent in the yarn is 0.22wt%), then the yarn passes through an oil nozzle, a spinning duct, the bottom region of an upper recess-shaped guide hook, the central position of a pre-networker and the bottom region of a lower recess-shaped guide hook in sequence, and is subjected to drafting and setting, main network and winding in sequence to obtain a high-density slubbing drawn yarn; wherein:

[0189] The pre-networker is an equal cross-section vertical plate, and a gas flow jet hole arranged horizontally is arranged on the pre-networker, the gas flow jet hole is a circular hole with a diameter of 1.3mm, and in the vertical direction, the gas flow jet hole is located at the middle position of the pre-networker;

[0190] A certain cross section of the pre-networker passes through the gas flow jet hole, the cross section is an Archimedes spiral, the polar angle of the Archimedes spiral is 430°, the gas flow jet hole is located at the position with a polar angle of 180° on the Archimedes spiral, and the gas flow jet hole faces the center of the Archimedes spiral;

[0191] The Archimedes helix coefficient of the Archimedes spiral is 1.5mm / °, and the polar radius at a polar angle of 0° is 1.9mm;

[0192] The upper recess-shaped guide hook and the lower recess-shaped guide hook are completely the same in structure and size, the upper recess-shaped guide hook is composed of a U-shaped guide hook and a limiting block, the U-shaped guide hook is horizontally arranged, the limiting block is connected with the inner wall of the U-shaped guide hook, and is used for limiting the yarn in the bottom region of the U-shaped guide hook;

[0193] In the vertical direction, the distance between the upper recess-shaped guide hook and the lower recess-shaped guide hook and the pre-networker is 16mm, and the length of the pre-networker is 26mm;

[0194] The included angle α between the yarn and the vertical direction at the upper recess-shaped guide hook is 9°, and the included angle β between the yarn and the vertical direction at the lower recess-shaped guide hook is 9°;

[0195] The gas flow jet hole of each pre-networker is communicated with a branch pipe, all the branch pipes are communicated with a same main pipe, and an automatic pressure regulating valve is arranged on the gas inlet end of the main pipe;

[0196] The pre-networking gas pressure is constant at 0.41MPa;

[0197] The drafting and setting adopts a GR1 hot roller set and a GR2 hot roller set, the GR1 hot roller set is composed of a GR1 hot roller A and a GR1 hot roller B, and the GR2 hot roller set is composed of a GR2 hot roller A and a GR2 roller B; the peripheral roughness of the GR1 hot roller A is uniform and has a value of 0.05 μm; the peripheral roughness of the GR1 hot roller B is uniform and has a value of 0.05 μm; the peripheral roughness of the GR2 hot roller A is uniform and has a value of 0.9 μm; and the peripheral roughness of the GR2 roller B is uniform and has a value of 0.9 μm;

[0198] The GR1 hot roller A, the GR1 hot roller B, the GR2 hot roller A and the GR2 roller B all have a cylindrical structure, the diameter of the GR1 hot roller A, the GR1 hot roller B and the GR2 hot roller A is 220 mm, and the diameter of the GR2 roller B is 110 mm;

[0199] The temperature of the GR1 hot roller A and the GR1 hot roller B is 65 ℃, the linear speed of the GR1 hot roller A and the GR1 hot roller B is 1620 m / min, the temperature of the GR2 hot roller A is 105 ℃, the linear speed of the GR2 hot roller A and the GR2 roller B is 2950 m / min, and the drafting multiple is 1.82 times;

[0200] The main network adopts a main network device, and the air pressure of the main network is 0.42 MPa;

[0201] The winding turns of the filament on the GR1 hot roller set and the GR2 hot roller set are both 5.5.

[0202] The final prepared high-density slubbing drafting filament has a slub density of 27 per meter, an elongation at break of 85.1%, a breaking strength of 3.34 cN / dtex, a boiling water shrinkage of 32.3%, a slub length before the boiling water shrinkage test of 0.65 cm, a slub length after the boiling water shrinkage test of 0.44 cm, a downgrading rate of 0.03%, a number of breakages of 4.2 times per 18 positions per 24 hours, and a network degree deviation of 3 per meter (the standard value of the network degree is 30 per meter).

[0203] Example B1

[0204] A preparation method of a random slubbing drafting filament, which is basically the same as that of Example A1, except that:

[0205] The used pre-networking device is supplied with air by an air supply device;

[0206] As shown in Figures 5-10 , the air supply device includes a driving mechanism and, in sequence, an air inlet pipe 2, a first fixed plate, a pressure changing turntable 12, a second fixed plate, an air outlet pipe 1 and a turntable shell 3;

[0207] The air inlet pressure of the air inlet pipe 2 is constant at 0.38 MPa;

[0208] As shown in Figure 6、 Figure 10 As shown in the drawings, the first fixed plate is provided with an air inlet hole 11, the pressure changing turntable 12 is provided with a plurality of air holes 14 which are distributed around the central circumference, the diameters of the plurality of air holes 14 are not completely the same, and the second fixed plate is provided with an air outlet hole 10;

[0209] The air inlet hole 11, the air outlet hole 10 and the air holes 14 are all circular holes; the diameters of the air inlet hole 11 and the air outlet hole 10 are 25 mm, and the number, the diameters and the positions of the plurality of air holes 14 are as shown in the drawings; Figure 9

[0210] As shown in the drawings, the outlet end of the air inlet pipe 2 is connected with the air inlet hole 11, the inlet end of the air outlet pipe 1 is connected with the air outlet hole 10, and the air outlet end of the air outlet pipe 1 is connected with the air flow injection hole; Figure 6 、 Figure 7 As shown in the drawings, the outlet end of the air inlet pipe 2 is connected with the air inlet hole 11, the inlet end of the air outlet pipe 1 is connected with the air outlet hole 10, and the air outlet end of the air outlet pipe 1 is connected with the air flow injection hole;

[0211] The first fixed plate, the pressure changing turntable 12 and the second fixed plate are all circular plates, the central axes of the three plates coincide and are mutually attached;

[0212] As shown in the drawings, the driving mechanism is used to drive the pressure changing turntable 12 to rotate at a uniform speed around the center thereof, so as to make the plurality of air holes 14 alternately communicate with the air inlet hole 11 and the air outlet hole 10; Figure 5 、 Figure 6 、 Figure 10 The driving mechanism includes a turntable shaft 5 and a driven gear 4, a driving gear 9, a gearbox 6, a motor 7 and a frequency converter 8 which are simultaneously located outside the turntable shell 3;

[0213] One end of the turntable shaft 5 penetrates through the shaft hole 13 of the first fixed plate and is fixedly connected with the pressure changing turntable 12, the driven gear 4 is fixedly sleeved on the turntable shaft 5 and is engaged with the driving gear 9, the driving gear 9 is fixedly sleeved on the output shaft of the gearbox 6, and the gearbox 6, the motor 7 and the frequency converter 8 are sequentially connected;

[0214] The air flow injection hole of each pre-networking device is connected with the air outlet end of the air outlet pipe 1 of one air supply device, the inlet ends of the air inlet pipes 2 of all the air supply devices are communicated with one common pipeline, and an automatic pressure regulating valve is arranged on the air inlet end of the common pipeline. The breakage frequency of the irregular slubbing drawn yarn prepared finally is 4.2 times per 18 positions per 24 hours, and the downgrading rate of the hairiness is 0.03%.

[0215] A method for preparing irregular slubbing drawn yarn, which is basically the same as that of the embodiment A2, except that:

[0216] The air flow injection hole of each pre-networking device is connected with the air outlet end of the air outlet pipe 1 of one air supply device, the inlet ends of the air inlet pipes 2 of all the air supply devices are communicated with one common pipeline, and an automatic pressure regulating valve is arranged on the air inlet end of the common pipeline. The breakage frequency of the irregular slubbing drawn yarn prepared finally is 4.2 times per 18 positions per 24 hours, and the downgrading rate of the hairiness is 0.03%.

[0217] Example B2

[0218] A method for preparing irregular slubbing drawn yarn, which is basically the same as that of the embodiment A2, except that:​

[0219] The pre-networker used is supplied with air by the air supply device;

[0220] The air supply device comprises a driving mechanism and, in sequence, an air inlet pipe, a first fixed plate, a pressure-changing turntable, a second fixed plate, an air outlet pipe and a turntable shell;

[0221] The air inlet pipe has a constant air inlet pressure of 0.4 MPa;

[0222] The first fixed plate is provided with an air inlet hole, the pressure-changing turntable is provided with a plurality of air holes distributed around the central circumference thereof, the diameters of the plurality of air holes are not completely the same, and the second fixed plate is provided with an air outlet hole;

[0223] The air inlet hole, the air outlet hole and the air holes are all circular holes; the diameters of the air inlet hole and the air outlet hole are 25 mm, and the number, diameters and positions of the plurality of air holes are as shown in Figure 9 ;

[0224] The outlet end of the air inlet pipe is connected with the air inlet hole, the inlet end of the air outlet pipe is connected with the air outlet hole, and the air outlet end of the air outlet pipe is connected with the airflow injection hole;

[0225] The first fixed plate, the pressure-changing turntable and the second fixed plate are all circular plates, the central axes of the three plates coincide and are in close contact with each other;

[0226] The driving mechanism is used to drive the pressure-changing turntable to rotate at a uniform speed around the center thereof, so as to alternately connect the plurality of air holes with the air inlet hole and the air outlet hole;

[0227] The turntable shell has a circular tube structure, the first fixed plate and the second fixed plate are respectively fixedly connected with the two ends of the turntable shell, and the pressure-changing turntable is located inside the turntable shell and is in gap cooperation with the turntable shell;

[0228] The driving mechanism comprises a turntable shaft and, simultaneously, a driven gear, a driving gear, a gearbox, a motor and a frequency converter which are located outside the turntable shell;

[0229] One end of the turntable shaft is fixedly connected with the pressure-changing turntable through the first fixed plate, the driven gear is fixedly sleeved on the turntable shaft and is in meshing connection with the driving gear, the driving gear is fixedly sleeved on the output shaft of the gearbox, and the gearbox, the motor and the frequency converter are connected in sequence;

[0230] The airflow injection holes of the pre-networkers of the respective spinning positions are respectively connected with the air outlet ends of the air outlet pipes of the air supply devices, the inlet ends of the air inlet pipes of all the air supply devices are in communication with a same main pipeline, and an automatic pressure regulating valve is arranged on the air inlet end of the main pipeline.

[0231] The number of broken ends of the irregularly slubbing drawn yarn prepared finally is 4.4 times per 18 positions per 24 hours, and the downgrading rate of the slubs is 0.03%.

[0232] Example B3

[0233] A method for preparing irregular slubbing drafting yarn, substantially the same as example A3, except that:

[0234] The pre-networker used is supplied with air by an air supply device;

[0235] The air supply device comprises a driving mechanism and, in sequence, an air inlet pipe, a first fixed plate, a pressure changing turntable, a second fixed plate, an air outlet pipe, and a turntable shell;

[0236] The air inlet pipe has a constant air inlet pressure of 0.45 MPa;

[0237] The first fixed plate is provided with an air inlet hole, the pressure changing turntable is provided with a plurality of air holes distributed around the central circumference, the diameters of the plurality of air holes are not completely the same, and the second fixed plate is provided with an air outlet hole;

[0238] The air inlet hole, the air outlet hole, and the air holes are all circular holes; the diameters of the air inlet hole and the air outlet hole are 25 mm, and the number, diameters, and positions of the plurality of air holes are as shown in Figure 11 ;

[0239] The outlet end of the air inlet pipe is connected with the air inlet hole, the inlet end of the air outlet pipe is connected with the air outlet hole, and the air outlet end of the air outlet pipe is connected with the air flow injection hole;

[0240] The first fixed plate, the pressure changing turntable, and the second fixed plate are all circular plates, the central axes of the three plates coincide and are in close contact with each other;

[0241] The driving mechanism is used to drive the pressure changing turntable to rotate at a uniform speed around the center thereof, so as to alternately connect the plurality of air holes with the air inlet hole and the air outlet hole;

[0242] The turntable shell has a circular tube structure, the first fixed plate and the second fixed plate are respectively fixedly connected with the two ends of the turntable shell, and the pressure changing turntable is located inside the turntable shell and is in gap cooperation with the turntable shell;

[0243] The driving mechanism comprises a turntable shaft and, simultaneously, a driven gear, a driving gear, a gearbox, a motor, and a frequency converter located outside the turntable shell;

[0244] One end of the turntable shaft is fixedly connected with the pressure changing turntable through the first fixed plate, the driven gear is fixedly sleeved on the turntable shaft and is in meshing connection with the driving gear, the driving gear is fixedly sleeved on the output shaft of the gearbox, and the gearbox, the motor, and the frequency converter are connected in sequence;

[0245] The air flow injection holes of the pre-networkers of each spinning position are respectively connected with the air outlet ends of the air outlet pipes of one air supply device, the inlet ends of the air inlet pipes of all the air supply devices are in communication with one common pipeline, and an automatic pressure regulating valve is arranged on the air inlet end of the common pipeline.

[0246] The final prepared irregular slubbing drafting yarn has a broken end frequency of 4.6 times / 18 positions·24 hours and a downgraded rate of 0.03%.

[0247] Example B4

[0248] A method for preparing irregular slubbing yarn is substantially the same as that of Example A4, except that:

[0249] The pre-networker used is supplied with air by an air supply device;

[0250] The air supply device comprises a driving mechanism and, in sequence, an air inlet pipe, a first fixed plate, a pressure-changing turntable, a second fixed plate, an air outlet pipe and a turntable shell;

[0251] The air inlet pipe has a constant air inlet pressure of 0.43 MPa;

[0252] The first fixed plate is provided with an air inlet hole, the pressure-changing turntable is provided with a plurality of air holes distributed around the central circumference thereof, the diameters of the plurality of air holes are not completely the same, and the second fixed plate is provided with an air outlet hole;

[0253] The air inlet hole, the air outlet hole and the air holes are all circular holes; the diameters of the air inlet hole and the air outlet hole are 25 mm, and the number, diameters and positions of the plurality of air holes are as shown in Figure 11 ;

[0254] The outlet end of the air inlet pipe is connected with the air inlet hole, the inlet end of the air outlet pipe is connected with the air outlet hole, and the air outlet end of the air outlet pipe is connected with the air flow injection hole;

[0255] The first fixed plate, the pressure-changing turntable and the second fixed plate are all circular plates, the central axes of the three plates coincide and are in close contact with each other;

[0256] The driving mechanism is used to drive the pressure-changing turntable to rotate at a constant speed around the center thereof, so as to alternately connect the plurality of air holes with the air inlet hole and the air outlet hole;

[0257] The turntable shell has a circular tube structure, the first fixed plate and the second fixed plate are respectively fixedly connected with the two ends of the turntable shell, and the pressure-changing turntable is located inside the turntable shell and is in gap cooperation with the turntable shell;

[0258] The driving mechanism comprises a turntable shaft and, simultaneously, a driven gear, a driving gear, a gearbox, a motor and a frequency converter located outside the turntable shell;

[0259] One end of the turntable shaft is fixedly connected with the pressure-changing turntable through the first fixed plate, the driven gear is fixedly sleeved on the turntable shaft and is in meshing connection with the driving gear, the driving gear is fixedly sleeved on the output shaft of the gearbox, and the gearbox, the motor and the frequency converter are connected in sequence;

[0260] The air flow injection holes of the pre-networkers of each spinning position are respectively connected with the air outlet ends of the air outlet pipes of one air supply device, the inlet ends of the air inlet pipes of all the air supply devices are in communication with one common pipeline, and an automatic pressure regulating valve is arranged on the air inlet end of the common pipeline.

[0261] The breakage frequency of the irregular slubbing drawn yarn is 3.5 times per 18 positions per 24 hours, and the downgrading rate of the slubbing drawn yarn is 0.03%.

[0262] Example B5

[0263] A method for preparing irregular slubbing drawn yarn, which is basically the same as that in Example A5, except that:

[0264] The pre-networker used is supplied with air by an air supply device;

[0265] The air supply device comprises a driving mechanism and, in sequence, an air inlet pipe, a first fixed plate, a pressure-changing turntable, a second fixed plate, an air outlet pipe and a turntable shell;

[0266] The air inlet pipe has a constant air inlet pressure of 0.41 MPa;

[0267] The first fixed plate is provided with an air inlet hole, the pressure-changing turntable is provided with a plurality of air holes distributed around the central circumference thereof, the diameters of the plurality of air holes are not completely the same, and the second fixed plate is provided with an air outlet hole;

[0268] The air inlet hole, the air outlet hole and the air holes are all circular holes; the diameters of the air inlet hole and the air outlet hole are 25 mm, and the number, diameters and positions of the plurality of air holes are as shown in Figure 12 ;

[0269] The outlet end of the air inlet pipe is connected with the air inlet hole, the inlet end of the air outlet pipe is connected with the air outlet hole, and the air outlet end of the air outlet pipe is connected with the air flow injection hole;

[0270] The first fixed plate, the pressure-changing turntable and the second fixed plate are all circular plates, the central axes of the three plates coincide and are in close contact with each other;

[0271] The driving mechanism is used to drive the pressure-changing turntable to rotate at a constant speed around the center thereof, so as to alternately connect the plurality of air holes with the air inlet hole and the air outlet hole;

[0272] The turntable shell has a circular tube structure, the first fixed plate and the second fixed plate are respectively fixedly connected with the two ends of the turntable shell, and the pressure-changing turntable is located inside the turntable shell and is in gap cooperation with the turntable shell;

[0273] The driving mechanism comprises a turntable shaft and, simultaneously, a driven gear, a driving gear, a gearbox, a motor and a frequency converter which are located outside the turntable shell;

[0274] One end of the turntable shaft is fixedly connected with the pressure-changing turntable through the first fixed plate, the driven gear is fixedly sleeved on the turntable shaft and is in meshing connection with the driving gear, the driving gear is fixedly sleeved on the output shaft of the gearbox, and the gearbox, the motor and the frequency converter are connected in sequence;

[0275] The air flow injection hole of the pre-networker of each spinning position is connected with the air outlet end of the air outlet pipe of a gas supply device, the inlet end of the air inlet pipe of all the gas supply devices is communicated with the same main pipe, and an automatic pressure regulating valve is arranged on the air inlet end of the main pipe.

[0276] The broken end frequency of the finally prepared irregular slub draft yarn is 4.1 times / 18 positions·24 hours, and the downgrading rate of the hairiness is 0.02%.

Claims

1. A method for manufacturing irregular slubbing yarn, comprising sequentially adjacent oiling process, pre-networking process, draft setting process and main networking process, characterized in that, The pre-network adopts a pre-networker, which is provided with air flow injection holes arranged horizontally; The pre-networker is supplied with air by an air supply device; The air supply device comprises a driving mechanism and an air inlet pipe (2), a first fixed plate, a pressure changing turntable (12), a second fixed plate and an air outlet pipe (1) arranged in sequence; The first fixed plate is provided with an air inlet hole (11), the pressure changing turntable (12) is provided with a plurality of air holes (14) distributed around the central circumference, the diameters of the plurality of air holes (14) are not completely the same, and the second fixed plate is provided with an air outlet hole (10); The outlet end of the air inlet pipe (2) is connected with the air inlet hole (11), the inlet end of the air outlet pipe (1) is connected with the air outlet hole (10), and the air outlet end of the air outlet pipe (1) is connected with the air flow injection hole; The first fixed plate, the pressure changing turntable (12) and the second fixed plate are mutually adhered, the driving mechanism is used for driving the pressure changing turntable (12) to rotate at a uniform speed around the center thereof, so as to make the plurality of air holes (14) alternately communicate with the air inlet hole (11) and the air outlet hole (10).

2. A method of making an irregularly slubbed drawn yarn according to claim 1, characterized in that, The air inlet hole (11), the air outlet hole (10) and the air hole (14) are all circular holes; the diameters of the air inlet hole (11) and the air outlet hole (10) are 25 mm, the maximum diameter of the plurality of air holes (14) is 25 mm, the minimum diameter is 6.25 mm, and the other diameters are 12.5 mm or 18.75 mm.

3. The method for preparing irregular bamboo node drawn fibers according to claim 1, characterized in that, The first fixed plate, the pressure changing turntable (12) and the second fixed plate are all circular plates, and the central axes of the three plates coincide.

4. A method of making an irregularly textured filament according to claim 3, wherein, The air supply device further comprises a turntable shell (3), which is a circular tubular structure, the first fixed plate and the second fixed plate are fixedly connected with the two ends of the turntable shell (3) respectively, and the pressure changing turntable (12) is located in the interior of the turntable shell (3) and is in gap cooperation with the turntable shell (3).

5. A method of making an irregularly textured filament according to claim 4, wherein, The driving mechanism comprises a turntable shaft (5) and a driven gear (4), a driving gear (9), a gearbox (6), a motor (7) and a frequency converter (8) which are located outside the turntable shell (3) simultaneously; One end of the turntable shaft (5) is fixedly connected with the pressure changing turntable (12) through the first fixed plate, the driven gear (4) is fixedly sleeved on the turntable shaft (5) and is in meshing with the driving gear (9), the driving gear (9) is fixedly sleeved on the output shaft of the gearbox (6), and the gearbox (6), the motor (7) and the frequency converter (8) are connected in sequence.

6. The method for preparing irregular bamboo node drawn fibers according to claim 1, characterized in that, The oiling adopts an oil nozzle; The air inlet pressure of the air inlet pipe (2) is constant, and the value range is 0.38-0.45 MPa; The pre-networker is an equal cross-section vertical plate, a certain cross section of the pre-networker passes through the air flow injection hole, the cross section is an Archimedes spiral, the polar angle of the Archimedes spiral is greater than 360° and less than 450°, the air flow injection hole is located at a position with a polar angle of 180° on the Archimedes spiral, and the air flow injection hole faces the center of the Archimedes spiral; The wire guide hooks at the inlet and outlet of the pre-networker are groove-shaped wire guide hooks, which are composed of U-shaped wire guide hooks and limiting blocks, the U-shaped wire guide hooks are horizontally arranged, the limiting blocks are connected with the inner walls of the U-shaped wire guide hooks, and are used for limiting the wire bundle in the bottom region of the U-shaped wire guide hooks; the wire bundle passes through the bottom region of the upper groove-shaped wire guide hook, the central position of the pre-networker and the bottom region of the lower groove-shaped wire guide hook in sequence from top to bottom.

7. A method of making an irregularly textured filament according to claim 6, wherein, The Archimedes helix coefficient of the Archimedes spiral is 1-2 mm / °, and the polar radius when the polar angle is 0° is 1.5-2 mm; the air flow injection hole is a circular hole with a diameter of 1.1-1.3 mm, and is located at the middle position of the pre-networker in the vertical direction; the length of the pre-networker in the vertical direction is 23-27 mm.

8. A method of making an irregularly textured filament according to claim 6, wherein, The distance between each groove-shaped guide hook and the pre-networker in the vertical direction is 13-17 mm; the angle between the fiber bundle and the vertical direction at the groove-shaped guide hook located above is 5-10°; the angle between the fiber bundle and the vertical direction at the groove-shaped guide hook located below is 5-10°.

9. The method for preparing irregular bamboo node drawn fibers according to claim 1, characterized in that, The air flow injection hole of each pre-networker is connected with the air outlet end of the air outlet pipe (1) of a gas supply device, and the air inlet end of the air inlet pipe (2) of all gas supply devices is communicated with the same main pipeline, and an automatic pressure regulating valve is arranged on the air inlet end of the main pipeline.

10. The method of claim 1, wherein the method further comprises the step of: The drafting and setting adopts ​ The line speed of the GR1 hot roller group is 1500-1640 m / min, and the line speed of the GR2 hot roller group is 2850-3000 m / min, and the drafting multiple is 1.75-1.9 times; The GR1 hot roller group is composed of GR1 hot roller A and GR1 hot roller B, and the temperature of the GR1 hot roller group is 55-65 ℃, and the GR2 hot roller group is composed of GR2 hot roller A and GR2 hot roller B, and the temperature of the GR2 hot roller A is 100-105 ℃; The main network adopts a main networker, and the main network air pressure is 0.38-0.42 MPa; The surface roughness of the GR1 hot roller A is uniform, and the value is 0.05 μm; the surface roughness of the GR1 hot roller B is uniform, and the value is 0.05 μm; the surface roughness of the GR2 hot roller A is uniform, and the value is 0.9±0.05 μm; the surface roughness of the GR2 hot roller B is uniform, and the value is 0.9±0.05 μm; The winding number of the fiber bundle on the GR1 hot roller group and the GR2 hot roller group is 4.5-5.5.

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