CN103060979B - Single-spinneret-plate binary skin-core-type composite-spinning multiple-different-yarn production process - Google Patents

Abstract

The present invention relates to the production process of multiple different yarns of the same board binary sheath-core composite spinning, which adopts composite spinning equipment including two sub-boxes and one main box, and two different components, SD semi-dull slices and CD cationic Slices, after drying, melting and metering treatment by their respective drying equipment, screw extruder and auxiliary box, then enter the main box for spinning through composite spinneret components to obtain mixed fiber MOY filaments; then The mixed fiber MOY yarn is finished after being wound and textured. By adopting this technical scheme, fabrics with novel hand feeling (mainly wool feeling, fluffy, plump, active, anti-wrinkle, excellent elasticity, crisp, body bone, etc.), good heat and humidity comfort, and easy maintenance can be produced.

Description

Production process of multi-differential yarns in binary sheath-core composite spinning on the same board

technical field

The invention relates to the technical field of spun fibers, in particular to a production process of same-plate binary sheath-core composite spinning multi-differential yarns.

Background technique

With the development of economy, the change of social awareness and lifestyle, people put forward more and higher requirements for the functionality and comfort of textiles and clothing. It started the transition from imitating natural fiber characteristics to the current super natural fiber performance. To meet these needs, various physical and chemical modifications of fibers and production of functional textiles have become research hotspots.

However, regardless of natural fibers or chemical fibers, there is no absolute ideal fiber at present, and any fiber has both advantages and disadvantages. Blended filaments emerged to solve this problem. On the one hand, its application can obtain the most suitable and optimal yarn for specific purposes; on the other hand, it also overcomes the disadvantages caused by the excessive uniformity of chemical fiber products in the past. Provide foundation and guarantee for the development of wool-like and silk-like simulation products. Mixed fiber yarn has better toughness than some ordinary fibers. The different denier, different shrinkage characteristics and acid-base treatment between the composite raw yarn can make the surface of the fabric soft and fluffy, and obtain a better wool-like effect.

The birth of chemical fiber wool-like technology not only solves the difficulties of shortage of wool fiber resources and high price, but also makes up for the shortage of wool fabrics, and opens up a wider field for the application of synthetic fibers. The general filament wool-like method is mainly to apply various deformation methods to deform the filament, so that the filament will produce more loops and curls on the surface, and the bulkiness will be enhanced; or the yarn with different cross-sections, different deniers and different shrinkages will be used. Carry out the development of wool-like products. Deformation processing methods include false twist deformation processing, air deformation processing, heat flow (nozzle) deformation processing and combined multiple deformation processing between them. The yarns they process have their own styles and characteristics, but they all need to be produced on specific machines. It is a relatively large investment for general enterprises to purchase such machines. How to make the production process of wool-like yarn break through and then process The limitation of the equipment has become a subject of research value.

Therefore, many domestic and foreign manufacturers have begun to focus on the improvement of spinning technology to produce filament wool-like raw materials. Representative is the development and production of shaped fibers. Special-shaped fibers can improve the luster of yarns, eliminate the waxy feel and aurora effect of ordinary filaments, and because the strength and elongation are properly reduced, the yarns have good anti-pilling properties, and the fibers have a longitudinal groove structure , it is beneficial to improve the wicking effect of the yarn, the moisture absorption and air permeability are good, and the comfort of the product is improved. But it is not enough fluffy when used alone. Some enterprises directly add a yarn feeding device to the original texturizing equipment, so that two kinds of yarns with different shrinkage rates can be combined into a yarn. After fabric heat treatment, the fibers with a large shrinkage rate are transferred to the inside of the yarn to become the core. Yarn, and the fiber with small shrinkage is covered in the surface layer of the yarn in a buckling wave shape, which also achieves the purpose of wool-like. But the feel of wool-like fabric is still lacking.

In view of this, the inventor combined his years of experience in the field of spinning fiber research to conduct long-term research on the defects in the above-mentioned technical field, and this case arose.

Contents of the invention

The purpose of the present invention is to provide the same board binary sheath-core composite spinning multi-differential yarn production process to overcome the existing technical defects.

In order to achieve the above object, the technical scheme of the present invention is as follows:

The same board binary sheath-core compound spinning multi-differential yarn production process adopts a compound spinning equipment including two sub-boxes and one main box. Two different components, SD semi-dull slices and CD cationic slices, are processed through After the respective drying equipment, screw extruder and sub-boxes are dried, melted and metered, they enter the main box for spinning through the composite spinning assembly to obtain mixed fiber MOY filaments; then the mixed fiber MOY Silk, after processing including winding and texturing, the finished product is obtained.

Among them, in the drying process, the pre-crystallization temperature of SD is 175°C, the drying temperature is 165°C, the drying time is 4-6 hours, and the dew point of dry air is -70°C; the pre-crystallization temperature of CD is 145°C, and the drying temperature is 150°C. ℃, drying time is 5-7 hours, and the dew point of dry air is -70℃; after the slices are dried, the moisture content of SD semi-dull slices is ≤0.002%, and the moisture content of CD cationic slices is ≤0.003%.

Among them, during the melting process, the screw extruder adopts multi-section zone heating, with a low-temperature mixing head at the front end, and the temperature of the fifth zone of the SD screw is 280°C/283°C/285°C/288°C/290°C, and the temperature of the fifth zone of the CD screw Zone temperatures are 270°C/275°C/280°C/285°C/288°C, respectively.

Among them, in the metering spinning process, a sub-box is used for SD components, and the temperature of biphenyl is set at 288°C. It enters the composite spinning assembly through its own melt pipe, and the melt is distributed in the high-precision distribution plate. The outer layer of the component, the other sub-box takes the CD component, the biphenyl temperature is set at 280°C, and enters the composite spinneret component through its own melt pipe, and the high-precision distribution plate makes the melt distributed in the component. layer, so that when the two components exit the spinneret, the SD fiber will cover the CD component evenly, forming a uniform sheath-core structure mixed fiber MOY filament; the same spinneret can be designed with holes of different components number. Among them, the side blowing temperature is 23-25°C, the side blowing humidity is 70°C, the side blowing wind speed is 0.55m/s, and the oiling rate is 0.5%;

Among them, in the winding process, the spinning speed is controlled at 2300-2600m/min, and the winding tension is controlled within the range of 0.05-0.10cn/dtex.

Among them, in the texturing process, the speed ratio of the false twister is 1.65, high temperature stretching (stretching temperature is 180-200 ℃), low temperature or room temperature setting (setting temperature is set at room temperature - 100 ℃ according to the needs of the product) ) control technology, the stretching ratio is between 1.3-1.8, and the stretching speed is between 300-500m/min; -200°C, the temperature of the second hot box is normal temperature - 100°C.

Further, in the texturing process, the intelligent pneumatic servo positioning control technology is added to the ordinary false twist deformation technology.

Further, adding the intelligent pneumatic servo positioning control technology to the ordinary false twist deformation technology refers to installing a wire hitting device between FR ₀ (that is, zero roller) and FR ₁ (that is, one roller), including cylinder, Straight rod and screw rod, the piston of the cylinder is fixedly connected with a straight rod, and the straight rod is fixed with a screw rod perpendicular to the axis of the straight rod; the cylinder is controlled by a pneumatic servo positioning system, so that the straight rod fixed on the cylinder piston follows the The piston of the cylinder moves as a piston, and drives the screw rod to move left and right, and the screw rod is pushed to beat the mixed fiber MOY wire. In this way, through the application of the pneumatic servo positioning control system, the rhythm frequency, time length, and stroke length of the cylinder piston movement can be controlled, so that different styles of products can be produced.

Further, the threading device can be installed one or more between FR ₀ (that is, zero roller) and FR ₁ (that is, one roller) according to processing needs; the number of threading rods is the same as that of the mixed fiber MOY on the machine. Silk corresponds.

Further, in the texturing process, the following special yarn path is used: mixed fiber MOY yarn→FR0→filament guide→filament beating device 1→filament guide→filament guide→filament beating device 2→filament guide→FR1→first Hot box→cooling plate→false twister→second roller→network nozzle→second hot box→third roller→winding→finished product.

The focus of the present invention is to develop a blended yarn with two components that have different deniers and different shrinkages on the same spinning pack and that the fibers gather in layers after heat treatment. After the heat treatment, the fibers of different raw materials Fibers with different shrinkage rates and different finenesses also have different thermal shrinkage rates due to differences in orientation and crystallinity, so the fibers will be distributed along the radial direction of the yarn due to different shrinkage rates, and at the same time controlled by a special post-processing process , so that the yarn not only has the proper wool-like bulkiness, but also the dye uptake rate of different raw materials causes the different color effect of the yarn, which further strengthens the wool-like effect of the yarn. Through the research and development of this project, a series of different varieties can be produced by changing different raw materials and different spinning component designs. Compared with other methods, direct spinning of mixed fiber different shrinkage yarn is more economical, convenient and better in effect , which can open up another path for the development and exploration of wool-like filaments.

In the process of use, we found that this technical solution has the following beneficial effects: First, by adopting this technical solution, it is possible to produce fabrics with a novel hand feel (mainly hairy, fluffy, plump, flexible, anti-wrinkle, excellent elasticity, crisp, and body-friendly). Bone, etc.), good heat and humidity comfort, easy maintenance and other excellent performance fabrics; second, using this technical solution, the composite spun multi-differential yarn has the characteristics of different deniers between the original filaments, which can make the fabric soft and smooth Not rotten, soft and crisp; thirdly, by adopting this technical scheme, the composite spun multi-differential yarn has the characteristic of different shrinkage, which can make the fabric have better bulkiness; fourthly, by adopting this technical scheme, The composite spun multi-differential yarn has a multi-layered structure between fibers, which can make the surface of the fabric have a concave-convex feeling, obtain a plush feel, and has good elasticity. After being indented by external force, it will produce Creep, easy to make indentation disappear, not easy to produce wrinkles.

In order to further explain the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Description of drawings

Figure 1 is a flow chart of the composite spinning multi-differential yarn production process, and the numbers of the attached drawings are as follows: slicing bin 1, slicing drying tower 2, screw extruder 3, auxiliary box 4, main box 5, upper godet 6, Lower godet 7, winding bobbin 8, friction roller 9, spinning tunnel 11;

Fig. 2 is a sectional view and a sectional view of the composite spinneret assembly, and the numbers of the drawings are as follows: distribution plate 1, distribution plate 2 and spinneret plate.

Fig. 3 is a drawing of the threading device, and the accompanying drawings are numbered as follows: cylinder 1, piston 11, straight rod 2, threading rod 3, mixed fiber MOY thread 4, sleeve pipe 5, frame 6 of texturing machine.

Figure 4 is a schematic diagram of the use of the threading device, and the numbers of the drawings are as follows: FR ₀ (ie zero roller) 1, threading device 2, threading device 3, threading rod 33, FR ₁ (ie one roller) 4, mixed fiber MOY Wire 40, wire guide 50;

Fig. 5 is the flow chart of composite spinning multi-differential yarn texturing process; FR ₀ (ie zero roller) 1, wire hitting device 1 2, wire hitting device 2 3, FR ₁ (ie one roller) 4, H ₁ (ie first roller) Hot box) 5, C _P (cooling plate) 6, Nip (false twister) 7, FR ₂ (second roller) 8, Jet (network nozzle) 9, H ₂ (second hot box) 10. FR ₃ (ie the third roller) 11. oil (ie oil tanker) 12. WR (ie winding roller) 13. Finished product 14.

Detailed ways

The implementation of the present invention will be further described in detail below in conjunction with the accompanying drawings. As shown in Figures 1 to 5, it is a preferred embodiment of the production process of the present invention.

(1) Main test equipment and main raw materials

Drying equipment: The production capacity of Beijing Dehoupu is 60kg/hr and 30kg/hr pilot drying equipment respectively.

Screw machine press: Shanghai JWELL Chemical Fiber Machinery Manufacturing Co., Ltd. manufactures two JWM-45 screw machine presses, horizontal L/D=25.

Spinning equipment: one set of 1-bit x 6-head composite spinning pilot equipment manufactured by Shanghai JWELL Chemical Fiber Machinery Manufacturing Co., Ltd.

Winding equipment: one set of 835 automatic winding machine manufactured by Shanghai JWELL Chemical Fiber Machinery Manufacturing Co., Ltd.

Texturing equipment: a 33H texturing machine from Murata Corporation of Japan.

One FK6-900 texturing machine of Jiangsu Hongyuan Textile Machinery Co., Ltd.

Cationic slices: Cationic slices produced by Zhejiang Chemical Fiber United Group Co., Ltd.; intrinsic viscosity [h]=0.56dL/g, melting point: 250°C, terminal carboxyl group≤35mol/t, w(TiO ₂ )≤0.4%.

Semi-dull slices: Semi-dull slices produced by Zhejiang Chemical Fiber United Group Co., Ltd.; intrinsic viscosity [h]=0.65 dL/g, melting point: 260°C, carboxyl end ≤27 mol/t, w(TiO ₂ )≤0.4%.

(2) Production process

The present invention uses the current international advanced composite spinning equipment, through the high-precision spinneret design and unique process flow, to produce fibers with two components with different deniers and different shrinkages after heat treatment on the same spinning assembly. Blended yarn gathered in layers. The process flow is shown in Figure 1, and the brief table is as follows:

SD semi-dull slice→drying→melting→metering→sub-box↘

CD cation slicing→drying→melting→metering→sub-box ↗main box→complex

Spinning assembly→spinning→winding→balancing→POY composite yarn→texturing→finished product

Specifically, a composite spinning equipment including two sub-boxes and a main box is used. Two different components, SD semi-dull chips and CD cationic chips, are passed through their respective drying equipment, screw extruders and sub-boxes. After the body is dried, melted and metered, it enters the main box and is spun through the composite spinneret assembly to obtain (2) the production process

The present invention uses the current international advanced composite spinning equipment, through the high-precision spinneret design and unique process flow, to produce fibers with two components with different deniers and different shrinkages after heat treatment on the same spinning assembly. Blended yarn gathered in layers. The process flow is shown in Figure 1, and the brief table is as follows:

SD semi-dull slice→drying→melting→metering→sub-box↘

CD cation slicing→drying→melting→metering→sub-box ↗main box→complex

Spinning assembly→spinning→winding→balancing→POY composite yarn→texturing→finished product

Specifically, a composite spinning equipment including two sub-boxes and a main box is used. Two different components, SD semi-dull chips and CD cationic chips, are passed through their respective drying equipment, screw extruders and sub-boxes. After being dried, melted and metered separately, it enters the main box and is spun through the composite spinneret assembly to obtain the mixed fiber MOY yarn; then the mixed fiber MOY yarn is processed including winding and texturing , to get the finished product.

Mixed fiber MOY yarn; and then the mixed fiber MOY yarn is processed including winding and texturing to obtain a finished product.

In the drying process, the pre-crystallization temperature of SD is 175°C, the drying temperature is 165°C, the drying time is 4-6 hours, and the dry air dew point of SD is -70°C; the pre-crystallization temperature of CD is 145°C, and the drying temperature is 150°C ℃, drying time is 5-7 hours, and the dew point of dry air is -70℃; after the slices are dried, the moisture content of SD semi-dull slices is ≤0.002%, and the moisture content of cationic slices is ≤0.003%.

During the melting process, the screw extruder adopts multi-stage zoned heating, with a low-temperature mixing head at the front end, the temperature of the five zones of the SD screw is 280°C/283°C/285°C/288°C/290°C, and the temperature of the five zones of the CD screw is respectively They are 270°C/275°C/280°C/285°C/288°C respectively.

As shown in Figure 2, in the metering spinning process, a sub-box carries SD components, and the temperature of biphenyl is set at 288°C. The melt is distributed on the outer layer of the component, and the other auxiliary box takes the CD component. The biphenyl temperature is set at 280°C, and it enters the composite spinneret component through its own melt pipeline, and the melt is distributed through a high-precision distribution plate. In the inner layer of the component, so that when the two components come out of the spinneret, the SD fiber will cover the CD component evenly, forming a uniform skin-core mixed fiber MOY yarn; different designs can be made on the same spinneret. The number of holes in the component (the number of holes can be determined according to the process requirements). Among them, the side blowing temperature is 23-25°C, the side blowing humidity is 70°C, the side blowing wind speed is 0.55m/s, and the oiling rate is 0.5%;

In the texturing process, the speed ratio of the false twister is 1.65, high temperature stretching (stretching temperature is 180-200 ℃), low temperature or room temperature setting (setting temperature is set at room temperature - 100 ℃ according to the needs of the product) Control technology, the stretching ratio is between 1.3-1.8, and the stretching speed is between 300-500m/min; the polyester filament stretching and deformation heating box adopts the form of biphenyl ether heating, and the temperature of the first heating box is 180-200 °C, the temperature of the second hot box is normal temperature——100 °C.

In the texturing process, the intelligent pneumatic servo positioning control technology is added to the ordinary false twist deformation technology.

As shown in Figure 3, the intelligent pneumatic servo positioning control technology is added to the ordinary false twist deformation technology, which means that a wire hitting device is installed between FR ₀ (that is, zero roller) and FR ₁ (that is, one roller), including the cylinder , a straight rod and a screw rod, the piston 11 of the cylinder 1 is fixedly connected with a straight rod 2, and the straight rod is fixed with a screw rod 3 perpendicular to the axis of the straight rod 2; the cylinder 1 is controlled by a pneumatic servo positioning system, so that it is fixed on the The straight rod 2 on the cylinder 1 piston moves with the piston of the cylinder 1, and drives the screw rod 3 to move left and right, and the screw rod is pushed to beat the mixed fiber MOY wire 4. Specifically, the mixed-fiber MOY yarn passes between the adjacent beating rods during operation. When the beating rod moves to the left and hits the thread, the thread is subjected to a transverse force, which is equivalent to pulling the thread. stretch. Therefore, through the application of the pneumatic servo positioning control system, the rhythm frequency, time length, and stroke length of the cylinder piston movement can be controlled, so that different styles of products can be produced. In this embodiment, when the wire hitting device is used, the cylinder is fixed on the frame of the texturing machine, and the mixed fiber MOY wire is placed between adjacent striking rods. Without deformation during the movement, the casing 5 can be fixed on the frame 6 so that the straight rod 2 can be inserted into the casing 5 .

As shown in Figure 4, the thread-hitting device can be equipped with one or more tracks between FR ₀ (that is, zero roller) and FR ₁ (that is, one roller) according to processing requirements; The upper mixed fiber MOY silk corresponds. Because the threading device must hit every thread, that is to say, how many threading rods must be added as many threads as there are in the machine.

As shown in Figure 5, in the texturing process, the following special yarn path is used: mixed fiber MOY yarn → FR0 → yarn guide → wire beating device 1 → wire guide → wire guide → wire beating device 2 → wire guide → FR1→1st hot box→cooling plate→false twister→2nd roller→network nozzle→2nd hot box→3rd roller→winding→finished product.

(3) Specific production process (take the specification of 240dtex/68f as an example)

1. Spinning assembly design

On the basis of the original composite spinneret assembly, this topic redesigns and manufactures the five internal distribution plates. According to the design requirements of the product, the number of holes of different components on the same spinneret plate is designed to be 42f and 26f respectively. In order to obtain For the best effect, we asked Changzhou Fangxing Precision Machinery Co., Ltd., the best component manufacturer in China, to design and manufacture the mixed fiber component of the present invention, as shown in Figure 2:

It can be seen from the figure that the same spinneret assembly has two spinning components with different components, which is the definition of the same spinneret binary. Taking the specification of 240dtex/68f as an example, the same spinneret assembly has two different components of 168dtex/42f cationic and 148dtex/26f semi-dull.

2. Process conditions (see the table below)

3. Discussion on the main process technology

(1) slice dry

① Slicing quality requirements

Chip drying is an important link in spinning, and its drying quality directly affects the spinnability of the fiber and the physical properties of the product. The moisture content of the slice is high, and the moisture is easy to vaporize during the spinning process, forming "bubble yarn", resulting in wool and broken ends, severe roll wrapping, and a decrease in the strength of the finished yarn. When cationic chips are used for spinning, the chips are easy to soften under higher temperature drying conditions due to the different internal structures, so that they will stick to other chips and cause the clogging of the feeding tube. The two different raw materials of the product are spun at the same component temperature, and the temperature-sensitive components of the raw materials are prone to degradation, or their rheological properties change greatly, which is not conducive to spinning and forming.

② Chip drying process and process parameters

Wet slicing→bag opening→screening→iron removal→pulse conveying→wet slicing silo→pre-crystallization→drying→dry slicing→dry slicing silo

Take the yarn with a specification of 240dtex/68f as an example, SD means semi-dull, and CD means cationic. During the drying process, the pre-crystallization temperature of SD is about 175°C, the pre-crystallization temperature of CD is about 145°C; the drying temperature of SD is about 165°C, and the drying temperature of CD is about 150°C; the drying time of SD is about 4- 6h, CD drying time is about 5-7h; SD dry air dew point is about -70 ℃, CD dry air dew point is about -70 ℃.

(2) spinning

① Spinning temperature

The change of spinning temperature significantly affects the surface tension and viscoelastic properties of the spinning stock solution. The relaxation time of the melt decreases with the increase of temperature, which reduces the expansion phenomenon of the melt after it exits the spinneret hole. In addition, the surface tension of the melt also decreases with temperature. With the increase of temperature, the viscosity of the melt decreases gradually, which reduces the resistance of extruding from the shape of the spinneret hole, but increasing the spinning temperature will cause the fiber forming to be too intense, and the fiber cross-section is likely to cause cracks or grooves, which will affect the strength of the filament . The screw extruder adopts multi-section heating method, and the front end is equipped with a low-temperature mixing head to ensure that the extruded melt is uniform. In order to improve the flexibility of the production line, the sleeve design of the secondary screw extruder adopts bimetallic spraying technology to meet the requirements of flexible production. When using cationic slices, in order to make the slices melt and mix evenly, reduce the influence of the laminar flow phenomenon of the melt in the pipeline during the flow, and increase the melting temperature of the screw appropriately. Take the yarn with a specification of 240dtex/68f as an example, SD means semi-dull, and CD means cationic. During the spinning process, the temperature in zone I of the screw, SD is about 280°C, CD is about 278°C; the temperature in zone II of the screw, SD is about 283°C, CD is about 280°C; the temperature in zone III of the screw, SD is about 285°C, CD is about 283°C; temperature in zone IV of screw, SD is about 288°C, CD is about 285°C; temperature in zone V of screw, SD is about 290°C, CD is about 288°C; SD component biphenyl temperature is about 288°C , CD component biphenyl temperature is about 280 ℃.

② Side blowing

The fiber bundles are distributed in thickness along the radial direction, and the cooling of the side blowing can make the performance of the multi-filaments more different, which is beneficial to the effect. Therefore, the cooling conditions of the fibers are properly strengthened to make the crystallinity of the inner and outer fibers greater. difference. In addition, the side blowing filter material (non-woven fabric) should be cleaned in time to shorten the replacement cycle to effectively reduce the unevenness of POY raw silk. During the cooling process, the temperature and speed of the side blowing have a great influence on the formation and performance of the fiber. When the temperature of the side blowing is too low, the strong cooling will easily cause the outer layer orientation on the entire spinning line to be high and the core layer to be low. Part of the molecular orientation and crystallinity orientation are different, which affects the fiber strength, and it is easy to cause mesh on the side during winding forming. When the side blowing temperature is too high, it is easy to cause changes in the degree of fiber irregularity, and the spun fibers are relatively elongated, and there is velvet on the side during winding and forming. As the wind speed increases, the molecular orientation and crystallographic orientation of the fibers increase, resulting in a decrease in elongation at break and an improvement in strength. As long as the spinneret zone is not too cold, increasing the cooling rate will not have a major impact on spinnability. Taking the yarn with a specification of 240dtex/68f as an example, during the spinning process, the side blowing temperature is about 25°C, the side blowing humidity is about 70°C, and the side blowing wind speed is about 0.55m/s.

③ Component process

Appropriate component pressure can make the melt more uniformly mixed in the component, which is beneficial to the uniformity of fiber quality. When the melt passes through the filter medium, the shearing effect will cause the temperature of the melt to rise to a certain extent. Therefore, in order to avoid the large degradation caused by the raw material staying in the high temperature pipeline for a long time, a lower tank can be used. Body temperature, and a higher filtration pressure is used to make the melt reach the temperature required for spinning.

④ Oiling

In the hot drawing stage, due to the different thermodynamic states of polymers (different glass transition temperatures), in order to make the thermal shrinkage rate of each fiber different, the same multifilament bundle can be coated with oil unevenly, so that some fibers are oiled and some fibers are oiled. Fibers are rarely or unoiled. Taking the yarn with a specification of 240dtex/68f as an example, the oiling rate is 0.5% during the spinning process.

(3) Winding

① Winding speed

A constant winding speed is a necessary condition for uniform winding. If the initial speed is too fast, the diameter of the wire tube will increase, and the rotation speed will decrease to achieve a constant line speed. If the speed is too fast, a large air circle will be formed, and it is easy to collide with each other and cause broken ends. It can be compensated by reducing the winding speed. After testing, the spinning speed can be controlled at 2500-2800m/min to meet the requirements. Taking the yarn with a specification of 240dtex/68f as an example, during the spinning process, the yarn winding speed is about 2600m/min.

② Winding tension

The winding tension is high, and the silk layers are embedded, and it is not easy to withdraw and break when unwinding. If the winding tension is too small, the coil will be stripped off during unwinding and the end will be broken, or even the edge will collapse. In general, the tension control should be slightly larger to reduce the occurrence of stripping. The key to the winding of multi-filament is to control the spinning tension. We install the godet and use the speed difference between the godet and the winding roller to control the tension of the fiber. After many tests, the winding tension is controlled at The range of 0.05－0.10cn/dtex is ideal.

(4) Bombing

In order to perfectly reflect the style of the product, unconventional texturing technology is adopted in the texturing process research.

① Control program:

We have designed and adopted the intelligent airflow servo positioning control technology and added it to the ordinary false twist deformation technology. The combined use of the two has realized a control completely different from the conventional texturing process. The key technology is the length of the timing pulse time in the airflow servo control, The size control of the cylinder pressure and the control of the position distance, the control of the tension of the yarn path, and the relationship between the false twisting process and the style of the multi-dimensional wool-like fiber, etc. In the specific implementation process, we will comprehensively study the main factors of the following aspects, including: (A) effective use of frequency conversion closed-loop control technology, variable program control technology, and intelligent servo positioning control technology; (B) control software The impact on product quality, performance and operability, etc. Establish a relationship model between product performance and each main factor, through continuous feedback, optimize each main joint point, and realize the perfect embodiment of product performance. Taking the yarn with the specification of 240dtex/68f as an example, the speed ratio of the false twister is 1.65.

② Silk Road:

The products in this subject use modified raw materials, and use frequency conversion closed-loop control, variable program control, intelligent servo positioning control and other technologies to control feeding, so as to produce products of different styles. Therefore, a reasonable thread path not only affects the operability of production, but also affects the style of the product. Through a large number of tests, we adopted the thread path of the special texturizing process flow chart shown in Figure 2, and achieved satisfactory results.

③ Temperature control:

The temperature control of this topic mainly depends on the selection of raw materials. Since we use special raw materials with low crystallization and high orientation, we cannot use conventional process temperature control. Control Technology.

④ Stretch ratio:

Since the product in this subject reflects different macromolecular structures in the vertical direction, it presents multiple different hygroscopic effects macroscopically, so the remaining stretching ratio of the product is larger than that of conventional products, and it is controlled between 38% and 70% according to different styles. . Therefore, in the specific implementation process, it will be adjusted according to the style of the product. Experiments have proved that the general stretching ratio is between 1.3 and 1.8, which can meet the requirements and maintain good operability. Taking the yarn with a specification of 240dtex/68f as an example, the draw ratio of the yarn is about 1.55.

⑤ Stretching speed:

In the production process of the subject product, the stretching speed is a very important parameter. If the speed is too fast, due to the presence of highly oriented segments in the longitudinal direction of the fiber, it is easy to produce wool and other phenomena, which will cause broken ends and abnormal production in severe cases; In addition, due to the multi-speed and different wire feeding speeds controlled by the expected program, in order to achieve a good effect, the speed of the machine should be low, otherwise there will be many ends broken and the operation will be difficult. But the speed is too low, which affects the production efficiency and high production cost. Therefore, under the premise of ensuring product quality, the stretching speed should be as high as possible. For this reason, through repeated tests, the tensile speed is finally selected between 300-500m/min, which can obtain good results and ensure the quality of the product. Taking the yarn whose specification is 240dtex/68f as an example, the silk speed of the yarn is about 400m/min.

⑥ Heating temperature:

The polyester filament stretching deformation heating box adopts the heating form of diphenyl ether. In the deformation process of using MOY raw silk to process multi-differential filaments, increasing the temperature of the first hot box can enhance the movement ability of the fiber macromolecular segments, and improve the perfection of the formed crystal lattice. Under the action of tensile force , the chain segments in the amorphous region and the crystal grains in the crystalline region are easy to be oriented and deformed, and the bulkiness becomes better; but when the temperature is too high, the thermal movement of molecules is intensified, it is difficult to form crystals, the tendency of disorientation increases, the degree of orientation decreases, and the fiber The strength is reduced, it is easy to produce wool and stiff silk, and the curling performance is reduced. The function of the second hot box is to shape the deformation of the fiber in the first hot box, which determines the crimp and feel of the fiber. In order to obtain fibers with better bulkiness, it is found through experiments that the temperature of the second hot box is slightly lower than that of conventional products, and the bulkiness of the filament appearance is improved. If the temperature is too high, the fibers will feel rough and hard. At the same time, it can increase the overfeeding of the setting, and the fluffiness of the fiber will be further improved. Taking the yarn whose specification is 240dtex/68f as an example, the temperature of the first hot box is 180°C, and the temperature of the second hot box is 100°C.

Blended filaments emerged to solve the deficiencies in some specific aspects of natural fibers and chemical fibers, providing the possibility to obtain the most suitable and optimal performance yarns, and also overcoming some of the past drawbacks. As mentioned above, the main raw materials of multi-differential yarns for binary sheath-core composite spinning on the same board are: cationic slices and semi-dull slices. Select the appropriate drying temperature and humidity, spinning speed, cooling conditions and component technology, control the winding speed and winding tension, as well as the texturing technology, so as to obtain the following beneficial effects:.

Using composite spinning equipment, through the selection of raw materials and the adjustment of process conditions, fibers with different characteristics such as different shrinkage, different fineness and different cross-sections can be developed, which helps to improve the grade of fabrics and make fabrics have more and more superior properties. It caters to the needs of consumers very well.

All raw materials etc. used in the present invention are all conventionally used unless otherwise specified, and can be purchased from the market; used equipment or other parts in special equipment, unless otherwise specified, are all conventional equipment or specific equipment The conventionally known parts in the method can be purchased from the market; the process methods used, if not specifically stated, all refer to conventional process methods, so they will not be described in detail. In the present invention, unless otherwise specified, all amounts and percentages are in weight units.

The above descriptions are only specific embodiments of the present invention, and are not limitations to the design of this case. All equivalent changes made according to the design key of this case all fall within the scope of protection of this case.

Claims (1)

1. with the how different yarn production technology of plate binary core-skin type Compound spinning, it is characterized in that: adopt the composite spinning equipment comprising two auxiliary box bodies and a main box, two kinds of different components, SD semi-dulling chips and the section of CD CATION, carry out after drying, melting and metering process respectively through respective drying equipment, screw extruder and auxiliary box body, enter main box again and carry out spinning process by composite spinneret pack, obtain mixed fine MOY silk; Then to this mixed fine MOY silk, after carrying out the process comprising winding and add bullet, finished product is obtained;

Wherein, in dry process, the pre-crystallization temperature of SD is 175 DEG C, baking temperature is 165 DEG C, drying time is 4-6 hour, dry air dew point is-70 DEG C; The pre-crystallization temperature of CD is 145 DEG C, baking temperature is 150 DEG C, drying time is 5-7 hour, dry air dew point is-70 DEG C; After chip drying, moisture content≤0.002% of SD semi-dulling chips, moisture content≤0.003% of CD CATION section;

Wherein, in melt process, screw extruder adopts the mode of multi-section partition heating, and front end is with low temperature mixing refining head, SD screw rod five district temperature is respectively 280 DEG C/283 DEG C/285 DEG C/288 DEG C/290 DEG C, and CD screw rod five district temperature is respectively 270 DEG C/275 DEG C/280 DEG C/285 DEG C/288 DEG C;

Wherein, in metering spinning process, an auxiliary box body walks SD component, biphenyl temperature is set as 288 DEG C, composite spinneret pack is entered by the melt pipe of oneself, the distribution plate made through high accuracy makes melt be distributed in the skin of assembly, another auxiliary box body walks CD component, biphenyl temperature sets 280 DEG C, composite spinneret pack is entered by the melt pipe of oneself, the distribution plate made through high accuracy makes melt be distributed in the internal layer of assembly, thus when making two components go out spinnerets, SD fiber, very equably by coated for CD component, forms the mixed fine MOY silk of uniform skin-core structure; Same spinnerets can design the hole count of different component;

Wherein, lateral blowing temperature is 23-25 DEG C, and lateral blowing humidity is 70 DEG C, and lateral blowing wind speed is 0.55m/s, and oil applying rate is 0.5%;

Wherein, in winding process, spinning speed controls at 2300-2600m/min, and Winding Tension Controlling is within the scope of 0.05-0.10cn/dtex;

Wherein, add in bullet process, false twister speed ratio is 1.65, (setting temperature is according to the needs of product to adopt the sizing of drawing by high temperature (draft temperature is 180-200 DEG C), low temperature or normal temperature, be set in normal temperature---100 DEG C) control technology, draw ratio is between 1.3-1.8, and draw speed is between 300-500m/min; Polyester filament adds bullet deformation hot box and adopts Biphenyl Ether heat form, and the temperature of the first hot case is 180-200 DEG C, and the second heater temperature is normal temperature---and 100 DEG C;

Describedly add in bullet process, intelligent pneumatic power Position servo control technology is joined in common false twist texturing technology;

Described intelligent pneumatic power Position servo control technology is joined in common false twist texturing technology, refer at FR0(i.e. zero roller) and a FR1(i.e. roller) between install blow silk device additional, comprise cylinder, straight-bar and hit screw mandrel, the piston of cylinder is fixedly connected with straight-bar, straight-bar is fixed with straight-bar axis perpendicular and hits screw mandrel; Cylinder is controlled by pneumatic position servo system, makes to be fixed on the straight-bar on cylinder piston and does piston movement with the piston of cylinder, and drives and hit screw mandrel side-to-side movement, hits screw mandrel and can beat mixed fine MOY silk by promotion;

Describedly hit silk device, can need at FR0(i.e. zero roller according to processing) and a FR1(i.e. roller) between install additional one or multi-channel; Wherein hit the quantity of screw mandrel, corresponding with fine MOY silk mixed on machine;

Describedly to add in bullet process, adopt following special silk road: mixed fine MOY silk → FR0 → thread guide → hit silk device one → thread guide → thread guide → hit silk device two → thread guide → FR1 → the first hot case → coldplate → false twister → the second roller → the nozzle of interlace → the second hot case → three roller → winding → finished product.