CN115140615A

CN115140615A - Process control method for improving winding and spinning-in efficiency of spandex fiber

Info

Publication number: CN115140615A
Application number: CN202210740140.7A
Authority: CN
Inventors: 季玉栋; 朱胜涛; 孙湘东; 杜春树; 刘书岳; 康许科; 吴华山; 贾舰; 王光星; 张亚飞
Original assignee: Xinxiang Chemical Fiber Co Ltd
Current assignee: Xinxiang Chemical Fiber Co Ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-10-04

Abstract

The invention provides a process control method for improving the winding and spinning-in efficiency of spandex fiber, which is characterized in that when the spandex fiber is wound and spun-in, the speed of a specific godet roller is set when the spandex fiber is wound and spun-in; after the spandex fiber is wound to the winding device, the speed of the godet is switched to the process speed of the godet during normal winding through a winding program control system in spinning, wherein the speed of the godet during winding and threading is lower than the process speed of the godet during normal winding. The process control method can improve the winding and spinning-in efficiency of the spandex fiber, and can control the winding tension of the spandex fiber, reduce the pre-drafting and further improve the product quality of the spandex fiber.

Description

Process control method for improving winding and spinning-in efficiency of spandex fiber

Technical Field

The invention belongs to the technical field of spandex fiber production, and particularly relates to a process control method for improving the winding and spinning-in efficiency of spandex fibers.

Background

The spandex fiber has great elasticity, can be stretched to 4-7 times of the original length under the general condition, has the elastic recovery rate of 100 percent under the stretching of 2 times or so, and has the elastic recovery rate of 95-99 percent when being stretched to 500 percent, which cannot be achieved by other fibers. Meanwhile, the tensile modulus of the spandex fiber is very small, about 0.1 cn/dtex. The low tensile modulus makes the spandex fiber inevitably generate certain drafting under the condition of extremely small winding tension, so that pre-drafting is inevitably generated when the spandex fiber is wound and is in the end.

Patent CN102190211A provides a spinning-in method in a spinning winding device, which reduces the waste silk amount generated in the spinning-in process by adjusting the rotating speed of the bobbin in the winding device. The winding device and the spinning-in process are completed by adjusting the rotating speed of the winding device, the godet roller is mainly used for stretching and tempering, and the godet roller is mainly used for winding fibers with high tensile modulus, such as terylene and the like, because the drawing process exists in the godet process. If the tensile modulus of the fiber is low, the yarn is easily broken in the yarn guiding process, and winding and threading cannot be smoothly carried out, and the process is obviously not suitable for the winding and threading process control of spandex fibers. The performance difference between the spandex fiber and the polyester fiber is very large, the elasticity of the spandex fiber is very large, and a godet roller is not needed for stretching in the production process. However, the spandex fiber has a low tensile modulus and a high elongation at break, which requires precise control of the winding tension of the spandex fiber during winding and spinning-in of the spandex fiber, and if the winding tension is too high, the fiber is easily broken, and the yarn breakage rate is high, which causes spinning-in failure, whereas if the winding tension is too low, the fiber is loose, and is easily wound around a roll.

Disclosure of Invention

In order to solve the technical problems, the invention creatively sets the speed of the godet roller at the beginning of the winding and the spinning-in of the spandex fiber, and leads the speed of the godet roller at the spinning-in of the spandex fiber to be different from the process speed of the godet roller at the normal winding after the spinning-in is finished through process control, thereby improving the spinning-in efficiency of the winding and the spinning-in of the spandex fiber, simultaneously controlling the winding tension of the spandex fiber, reducing pre-drafting and further improving the product quality of the spandex fiber.

The specific scheme of the invention is as follows:

a technological control method for improving the winding and spinning-in efficiency of spandex fiber is characterized in that when the spandex fiber is wound and spun-in, the speed of a specific godet roller is set when the spandex fiber is wound and spun-in;

after the spandex fiber is wound to the winding device, the speed of the godet is switched to the process speed of the godet during normal winding, wherein the speed of the godet during winding and spinning is lower than the process speed of the godet during normal winding.

Further, the process speed of the godet roller during normal winding is 600-1500m/min, preferably 800-1200m/min.

Further, the speed of the godet roller during winding is 400-800m/min, preferably 500-700m/min.

Further, the speed of the godet roller during winding is 40-95%, preferably 60-80% of the process speed during normal winding.

Further, the speed difference between the speed of the godet roller during winding and the process speed during normal winding is 100-600m/min, preferably 150-400m/min.

Further, the speed of the godet roller can be switched by a winding program control system in spinning.

For ease of description, spandex fiber and spandex filament are the same concept herein.

The invention provides a process control method for improving the winding and spinning-in efficiency of spandex fiber, which comprises the following steps: in the production process of spandex fibers, spandex filaments coming out of a spinning channel are hung on a filament divider by an operator, then pass through a godet roller, the speed of the godet roller is set to be a specific speed when the spandex fibers are wound around a yarn, and then the spandex filaments are sucked by a yarn feeding suction gun and sent into a winding device, after the spandex fibers are wound on the winding device, the speed of the godet roller is switched by a winding program control system in spinning to be a process speed when the yarn guide roller is normally produced, and the whole process is a spandex winding yarn feeding process control process. The time taken to complete the process control process of winding the yarn is the yarn start time. In the spandex winding and spinning-in process, the speed control of the godet roller directly influences the winding and spinning-in efficiency of spandex fibers and the final product quality of the spandex fibers. The invention provides a process control method for improving the reeling and spinning-in efficiency of spandex fibers, which is characterized in that the speed of a specific godet roller during reeling and spinning-in of spandex fibers is set, and the speed difference between the speed of the godet roller during reeling and the process speed of the godet roller during normal reeling is 100-600m/min, so that the fiber breakage rate is low in the operation process that an operator sucks spandex fibers by a spinning-in suction gun, the times of repeating the operation are reduced, the spinning-in time is short, and the reeling and spinning-in efficiency of the spandex fibers is improved. The process control method of the invention can even realize no broken spandex filament in the spinning-in process, and operators do not need to repeatedly operate, thereby greatly improving the spinning-in efficiency of winding spandex fibers.

The technical process of winding and spinning-in the spandex fiber needs workshop workers to operate a spinning-in suction gun. The pressure range of the compressed air in the suction gun is 0.4MPa-1MPa, preferably 0.6MPa-0.8MPa. The pressure is too low, the suction force of the suction gun is insufficient, and the spandex yarn cannot be sucked up; if the pressure is too high, the yarn is easy to be sucked and broken, the energy consumption is high, and meanwhile, potential safety hazards are caused. Too high or too low pressure is not beneficial to the completion of the spinning-in operation, so that in the spinning-in process, proper pressure needs to be set to complete the spinning-in operation.

Here, the winding tension of the spandex fiber is the mutual traction force which exists in the fiber and is perpendicular to the contact surface of two adjacent parts when the spandex fiber is wound on a spinning cake, the winding tension of the spandex fiber is affected by the traction force applied after the spandex fiber comes out of a spinning channel and before the spandex fiber is wound on the spinning cake, and in order to maintain the continuous and stable winding and the product quality of the spandex fiber, the winding tension needs to be kept in a proper range, preferably constantly. The spandex fiber spinning-in process is most likely to cause winding tension fluctuation, and because the spinning speed, the speed of the godet roller, the speed of the manually operated suction gun and the matching and connection of the speed of the winding device are involved, if the control process in the spinning-in process is not appropriate, spinning-in is difficult, the fiber breakage rate is high, the whole spinning-in process cannot be completed, and the spinning-in efficiency is reduced. According to the winding and threading process control method in the technical scheme, the speed of the specific godet roller during winding and threading is set; after the spandex fiber is wound to the winding device, the speed of the godet is switched to the process speed of the godet during normal winding, and the speed of the godet during winding and threading is lower than the process speed of the godet during normal winding, so that the problem is solved.

Specifically, the method comprises the following steps:

when the spandex fiber is wound and pieced together, the pressure range of a piecing suction gun and the operation limit difficulty of workers are limited, if the speed of the godet roller is set to be too high, the spandex fiber is not enough in winding tension in the process of winding and piecing together, the spandex fiber is easy to wind the roller, break silk and the like, and the smooth completion of piecing operation is influenced; if set up the speed of lower godet roller, though can improve the end-piecing operation degree of difficulty, the godet roller speed that is low relatively has directly led to spandex fibre to convolute the tension and has promoted, causes spandex spinning cake internal stress to increase, and draft grow in advance influences spandex fibre's final product quality. Therefore, in the spandex fiber spinning-in process, the speed of the specific godet roller during the spinning-in process is very important, and the specific godet roller process speed can also be used for adjusting the winding tension and the pre-drafting of the spandex fiber. The invention discloses a spandex fiber winding and spinning-in process control method, which is characterized in that when the spandex fiber winding and spinning-in process is started, the speed of a godet roller is set to be 100-600m/min lower than the process speed of the godet roller during normal winding, after the spandex fiber is smoothly wound on a winding device, the speed of the godet roller is adjusted to the process speed of the godet roller during normal winding through a winding program control system in spinning, and then stable winding production is carried out. The speed difference of different times in the process can not only reduce the operation difficulty of spinning-in, but also ensure the process speed of normal winding, and simultaneously can avoid winding rollers and broken yarns caused by the excessively high speed of the yarn guide roller during spinning-in, improve spinning-in efficiency, and also ensure that the pre-drafting of fibers is reduced during normal winding.

Optionally, when the spandex fiber is normally wound, the winding speed of the winding device is set to be higher than the process speed of the godet roller during normal winding, so that the winding tension of the spandex fiber during normal winding can be reduced, the pre-drafting is reduced, the product quality is improved, and the production efficiency is also improved.

Furthermore, the winding tension of the spandex fiber product prepared by the process control method for the winding and spinning-in efficiency of the spandex fiber can be controlled to be 0.20-0.25 CN.

Further, the pre-drafting of the spandex fiber product prepared by the process control method for the winding and spinning-in efficiency of spandex can be controlled to be 6-16%. The pre-drafting of the spandex fiber product prepared by the process control method of the more excellent spandex winding and spinning-in efficiency can be controlled to be 7-10%.

The number of the godet rollers is not limited, and the first godet roller, the second godet roller, the third godet roller, the fourth godet roller and the like can be arranged according to the actual production requirement. The speed of the godet rollers during spandex winding and the process speed during normal winding can be the same or different, and the smaller the speed difference is, the smaller the winding tension and the pre-draft of the finally wound and formed spandex fiber product are.

The winding and spinning-in position is not limited, and spinning-in can be carried out between the spinning channel and the first godet roller, or between the first godet roller and the second godet roller, or between the second godet roller and the third godet roller by using a spinning-in suction gun.

When the spinning-in is carried out, a guide roller is needed to wind the spandex waste silk generated in the process. The guide roller for winding the waste yarn is not limited in the present invention, and any one of the godet rollers or any one of the winding rollers may be used as the guide roller for winding the waste yarn. After the winding and threading process is finished, the waste silk on the waste silk is removed, and then the waste silk can be normally used.

Furthermore, the process control method for improving the winding and spinning-in efficiency of the spandex fiber is more suitable for the production of fine denier and superfine denier spandex fibers (fine denier spandex with the denier of less than 30D, particularly superfine denier spandex with the denier of less than 15D), and is particularly suitable for the production of high-density fine denier and superfine denier spandex fibers. Because the spinning density of the same spinning unit is higher when high-density fine denier and superfine denier spandex fibers are subjected to vitamin production, the number of spandex fibers from the yarn separator to the godet roller is more, the spandex fibers are thinner, the modulus of the spandex fibers is lower, the running tension is lower, and the spandex fibers are easier to break, so that the difficulty of winding and spinning the spandex fibers is more obvious, the yarn breakage and winding roller conditions are increased in the winding and spinning process, and the winding and spinning efficiency is reduced. By adopting the spandex winding and spinning-in process control method, the speed of the godet roller during spandex fiber winding production is set to be 100-600m/min lower than the process speed of the godet roller during normal winding, so that the phenomena of yarn breakage and roller winding in the fiber winding and spinning-in process are effectively reduced.

Chemical fiber denier unit: denier, abbreviated as D, and denier defined as: means the mass grams of 9000m long fibers at official moisture regain in denier. Such as: 9000 meters long and weigh 30 grams, which is 30D. The conventional spandex fiber is generally a product composed of 3 to 5 multifilaments having a fineness of 40D to 70D and a single filament fineness of 10 to 20 dpf. For the division of polyurethane fiber superfine denier and fine denier, no unified standard exists at present, products with the diameter of 15D-30D are generally called fine denier, and products with the diameter of less than 15D are called superfine denier. The super fine denier products of spandex are generally in the form of monofilaments, which generally have higher requirements for the production process. Here, the denier of 30D or less is referred to as fine denier spandex, and 15D or less is referred to as super fine denier spandex.

On the other hand, the invention provides the application of the process control method for improving the reeling and spinning-in efficiency of the spandex fiber in the production of the fine denier spandex fiber.

The invention has the beneficial effects that:

the process control method for improving the winding and spinning-in efficiency of the spandex fiber provided by the invention realizes spinning-in operation by adopting a mode of controlling the speed difference of the godet roller during winding and spinning-in and normal winding. Through setting up the speed of specific godet roller when coiling the repiece, the suitable pressure of suction gun is resumeed, guarantees to coil the repiece process and accomplishes smoothly, reaches the effect that improves repiece stability, improves repiece efficiency. After the spandex fiber is wound to the winding device, the speed of the godet roller during winding and spinning is switched to the process speed of the godet roller during normal winding through a winding program control system in spinning. Meanwhile, the process speed of the godet roller during normal winding and the winding speed of the winding device keep a certain speed difference, so that the winding tension of spandex fibers in the winding process is reduced, the pre-drafting is reduced, the winding and threading efficiency is improved, the spandex fiber product quality is improved, and the production efficiency is also improved.

Drawings

FIG. 1 is a schematic structural diagram of spandex fiber before winding;

FIG. 2 is a schematic structural view of a spandex fiber winding;

FIG. 3 is a schematic structural diagram of a spandex fiber after finishing winding and spinning-in;

description of reference numerals:

1.1-spinning channel; 1.2-spandex fiber; 1.3-first godet roll; 1.4-oiling device;

1.5-a second godet; 1.6-a suction gun for threading; 1.7-a third godet;

1.8-first winding device; 1.9-second winding device.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be further clearly and completely described below by text and/or with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in the specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.

It is also noted herein that elements and features depicted in one drawing or one embodiment of the invention may be combined with elements and features depicted in one or more other drawings or embodiments to avoid obscuring the invention with unnecessary detail, and that only device structures and/or processing steps germane to aspects consistent with the invention are depicted in the drawings and description and representations and descriptions of components and processes not germane to the invention that are known to those of ordinary skill in the art are omitted. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

Example 1

The speed at which the first godet roller 1.3 is set up when the spandex fiber is wound up is merely exemplified.

As shown in fig. 1, taking 120 pieces of 15D spandex fiber led out from a spinning shaft 1.1 as an example, the 15D spandex fiber 1.2 led out from the spinning shaft 1.1 passes through a first godet 1.3, then passes through an oiling device 1.4 and a second godet 1.5 in sequence, and then is temporarily wound on a third godet 1.7, at this time, the speed of the first godet 1.3 when the spandex fiber is wound up is set to be 600m/min, and the speeds of the second godet 1.5 and the third godet 1.7 when the spandex fiber is wound up are set to be 950m/min. An operator holds a spinning-in suction gun 1.6 (the pressure of compressed air in the suction gun is 0.6 MPa) to perform spinning-in operation at the A position, the suction gun breaks spandex fibers through suction force and sucks the spandex fibers into the suction gun, then the spandex fibers are held by the suction gun, the spandex fibers completely wind over a second godet roller 1.5 and are wound on a first winding device 1.8 below the first godet roller (as shown in figure 2), and the winding speed of the first winding device 1.8 is set to be 1000m/min. In this process, the third godet 1.7 is only temporarily used to wind the spandex fiber in the first step winding-in process.

After the spandex fiber is wound on the first winding device 1.8, the third godet roller 1.7 is stopped, and the spandex waste yarn wound thereon is removed. Then, the third godet roller 1.7 is started again, the operator holds the repiece suction gun to repiece at the position B, the half number of spandex fibers are snapped and sucked into the suction gun, and then the spandex fibers are wound on the second winding device 1.9 below the third godet roller 1.7 after being clamped by the suction gun (as shown in fig. 3), and at this time, the winding speed of the second winding device 1.9 is set to 1000m/min.

After the spandex fiber is wound on the second winding device 1.9, the speed 600m/min of the first godet roller 1.3 during winding and threading is switched to the process speed 850m/min during normal winding of the spandex fiber by operating a winding program control system in spinning, and the speed settings 950m/min of the second godet roller 1.5 and the third godet roller 1.7 are kept unchanged until the spandex fiber threading process is finished. In the process of controlling the process, the suction gun sucks the spandex yarn, the spandex yarn is broken for 2 times, the used yarn-feeding time is about 10min, and the winding tension is 0.24CN in normal operation. The winding pre-drafting of the obtained spandex fiber product is 15 percent through detection of a spandex filament pre-drafting test method (FZ/T50042-2018).

On the other hand, the spandex filaments wound around the third godet roller 1.7, the first winding device 1.8 and the second winding device 1.9 are generally treated as waste filaments generated during the spinning-in process before the speed at which the first godet roller winds the spinning-in is switched to its process speed at which the spandex fibers are normally wound.

In the winding and spinning-in process of the spandex fiber, the speed of the first godet roller 1.3 is set to be 600m/min, and the relatively low speed of the godet roller during spinning-in can ensure that the winding and spinning-in process of the spandex fiber can be smoothly completed; after the spandex fiber is wound on the winding roller, the speed of the first godet roller 1.3 is switched to the process speed of 850m/min during normal winding, the process speed is relatively improved, a certain speed difference is kept between the speed and the winding speed of the first winding device 1.8, the winding tension of the spandex fiber can be reduced, pre-drafting is reduced, winding and threading efficiency is improved, product quality is improved, and meanwhile production efficiency is also improved.

Example 2

The spandex fiber winding and spinning-in process control method is as described in example 1, and 120 pieces of 15D spandex fibers are led out from the spinning shaft 1.1 as an example, but the difference is that the speed of the first godet 1.3 and the second godet 1.5 at the time of spinning-in of the spandex fibers is set to be different. The speed of the first godet roller 1.3 and the second godet roller 1.5 when the spandex fiber is wound and is taken up is respectively set to be 600m/min and 700m/min; after the spandex fiber is wound on the first winding device 1.8, the speed of the first godet roller 1.3 and the second godet roller 1.5 during winding and threading is switched to the process speed of the first godet roller 1.3 and the second godet roller 1.5 during normal winding under the control of a winding program control system in the operation spinning, wherein the process speed of the first godet roller 1.3 and the second godet roller 1.5 during normal winding is 850m/min and 950m/min respectively, the winding speed of the first winding device 1.8 is set to be 1000m/min, and the winding speed of the second winding device 1.9 is also set to be 1000m/min. In the process of controlling the process, the suction gun sucks the spandex filament without breaking the spandex filament, the used spinning-in time is about 8min, and the winding tension is 0.22CN in normal operation. The winding pre-draft of the obtained spandex fiber product is 8%.

Compared with the example 2, when the spandex fiber is wound and is taken up, the speeds of the first godet roller 1.3 and the second godet roller 1.5 in the example 1 are 600m/min and 950m/min respectively; in example 2, the speeds of the first godet roll 1.3 and the second godet roll 1.5 were 600m/min and 700m/min, respectively. It can be seen that the speed difference between the first godet roller 1.3 and the second godet roller 1.5 in the embodiment 2 is smaller when the spandex fiber is wound and pieced together, so that the winding tension of the spandex fiber is better controlled, the pre-drafting is reduced, the winding and piecing-together efficiency of the spandex fiber is improved, and the product quality is effectively improved. Therefore, in practical applications, we prefer the solution of example 2.

Comparative example 1

Still taking the example of 120 pieces of 15D spandex fiber led out from the spinning duct 1.1, the speed of the first godet 1.3 and the second godet 1.5 at the time of winding the spandex yarn is consistent with the process speed of the spandex yarn at the time of normal winding, the speed of the first godet 1.3 at the time of winding the yarn and the process speed at the time of normal winding are both 750m/min, and the speed of the second godet 1.5 at the time of winding the yarn and the process speed at the time of normal winding are both 950m/min.

The spandex fiber winding process is as described in example 1. The suction gun of the scheme has the advantages that the phenomenon of broken ends of spandex filaments occurs for more than ten times when the suction gun sucks the spandex filaments, the repeated operation is needed, the used yarn-feeding time is about 20min, and the winding tension is 0.28CN in normal operation. The winding pre-draft of the resulting spandex fiber product was 20%.

Comparative example 2

Still taking the example of 120 spandex fibers led out of the spinning shaft 1.1, the speed of the first godet roller 1.3 and the second godet roller 1.5 at the time of spandex winding and threading is consistent with the process speed of the first godet roller 1.3 at the time of winding and threading, the process speed of the first godet roller 1.3 at the time of winding and the process speed of the second godet roller 1.5 at the time of normal winding are both 850 m/min. When an operator holds the suction gun to start, the yarn breaking and the roller winding occur for many times, and the process of winding spandex fibers to the winding device cannot be finished.

The final spandex fiber products of examples 1 and 2 and comparative example were tested according to the method of the "spandex filament pre-draft test method" (FZ/T50042-2018), and the respective winding pre-drafts are shown in table 1, along with the corresponding running winding tension values:

table 1: speed of godet roller, time for spinning-in and winding tension and pre-drafting of spandex cake when spinning-in is wound on spandex fiber

From table 1, we can see that the winding and threading process control method in example 2 has no broken spandex filament during threading, the time for winding threading is shortest, the winding and threading efficiency is higher, the winding tension and pre-draft of the final spandex fiber product are minimum, and the product quality of spandex fiber is greatly improved.

Claims

1. A process control method for improving the spinning-in efficiency of spandex winding is characterized in that: setting the speed of a specific godet roller when winding and spinning-in spandex fibers;

after the spandex fiber is wound to the winding device, the speed of the godet is switched to the process speed in normal winding, wherein the speed of the godet in winding the yarn is lower than the process speed in normal winding.

2. The process control method for improving the efficiency of winding spandex yarn according to claim 1, wherein: the speed of the godet roller during winding and threading is 400-800m/min.

3. The process control method for improving the efficiency of winding and spinning spandex according to claim 1, characterized in that: the speed of the godet roller during winding and threading is 40-95% of the process speed of the godet roller during normal winding.

4. The process control method for improving the efficiency of winding spandex yarn according to claim 1, wherein: the process speed of the godet roller during normal winding is 600-1500m/min.

5. The process control method for improving the efficiency of winding spandex yarn according to claim 1, wherein: the speed difference between the speed of the godet roller when winding the yarn and the process speed of the godet roller when winding the yarn normally is 100-600m/min.

6. A process control method for improving the winding and spinning-in efficiency of spandex is applied to the production of fine denier spandex fibers.