Fancy yarn rough surface uniformity processing control method

Abstract

The invention relates to the technical field of textile, in particular to a fancy yarn rough surface uniformity treatment control method which comprises the steps of S1, fiber pretreatment; s2, fiber mixing; s3, airflow conveying monitoring; s4, roving; s5, twisting to prepare yarns; according to the method, preliminary mixing and multi-group mixing are sequentially carried out on the fibers, the mixing uniformity condition of the fibers is judged, airflow conveying is carried out on the mixed fibers, the airflow conveying flow speed is adjusted when the fibers are deposited in a pipeline, and the airflow conveying flow speed is corrected in real time in the actual conveying process; by calculating the variable coefficient of the roving and judging whether the uniformity of the twisting process is qualified or not, the fancy yarn is manufactured, the rough surface image of the fancy yarn is obtained, whether the rough surface uniformity of the fancy yarn is qualified or not is judged, then the feedback signal is sent out, the rough surface uniformity of the fancy yarn can be accurately controlled, and the stability of the product quality is kept.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, in particular to a method for controlling the uniformity of fancy yarn hair surface. Background Art

[0002] In the modern textile industry, fancy yarns occupy an important position with their unique appearance and rich texture. From high-end fashion clothing fabrics to exquisite home textiles, fancy yarns are used everywhere, giving products a unique style and charm. With the continuous growth of consumers' demand for personalized and diversified textiles, the market demand for fancy yarns continues to rise.

[0003] Although the fleece effect of fancy yarns brings many advantages to textile products, the problem of fleece uniformity has always plagued the development of the industry. Poor fleece uniformity will lead to obvious differences in the appearance of the yarn, affecting the overall aesthetics and quality stability of the fabric. For example, when producing batches of fleece fancy yarn fabrics, if the fleece uniformity is inconsistent, the finished garments may have dense fleece in some areas and sparse fleece in other areas, seriously affecting the appearance consistency and commercial value of the product.

[0004] The existing Chinese patent application number 201910336810.7 discloses a method for producing knitted blended yarn. The scheme uses cotton fiber and viscose fiber as raw materials. The two fibers are processed in the front process of opening and cleaning cotton respectively and then fed into a multi-bin cotton mixing machine according to the blending ratio to achieve random mixing between each other under the action of airflow. The two randomly mixed fibers are then vibrated and beaten into rolls to obtain a mixed cotton roll, and then a series of processes are performed to obtain the required knitted blended yarn.

[0005] However, the above patent has the following problems: in this solution, airflow is used multiple times to achieve fiber transportation and mixing, but the stability of the airflow may be affected by many factors. If the airflow is unstable, it may cause uneven fiber transportation and mixing, thereby affecting the uniformity of the product.

[0006] For example, the existing Chinese patent with application number 202411221642.4 discloses a linen-like fancy yarn and a preparation method thereof. During the blending process, this scheme ensures the integrity and mixing uniformity of the fibers through pretreatment and specific process parameter adjustment, thereby improving the overall performance and quality of the yarn. In addition, a blend of multiple lyocell fibers is used to give the yarn a unique texture and visual effect, meeting the market demand for new textiles.

[0007] However, the above patent has the following problems: First, the solution does not provide further monitoring or adjustment means to ensure the uniformity of the yarn in the roving process, which may lead to uneven yarn density and uneven fabric surface in subsequent textile processing.

[0008] Second, this solution uses a mixture of multiple lyocell fibers. Different lyocell fibers vary greatly in length and fineness. During the twisting process, longer and thicker fibers may tend to be distributed in the outer layer of the yarn, while shorter and thinner fibers are more likely to be concentrated inside the yarn. This will cause uneven fiber distribution inside the yarn, thereby affecting the uniformity of twisting. This solution does not mention twisting, which may lead to unstable yarn quality. Summary of the invention

[0009] In order to overcome the shortcomings of the background technology, an embodiment of the present invention provides a method for controlling the uniformity of the hair surface of a fancy yarn, which can effectively solve the problems involved in the above-mentioned background technology.

[0010] The purpose of the present invention can be achieved through the following technical solutions: A method for controlling the uniformity of the wool surface of a fancy yarn, the method comprising the following steps: S1. Fiber pretreatment: obtaining the moisture regain of each fiber raw material and performing a moisture regain balance treatment on it.

[0011] S2. Fiber mixing: Perform preliminary mixing and multiple group mixing of the fibers in sequence, and determine the uniformity of the fiber mixing.

[0012] S3. Airflow conveying monitoring: The mixed fibers are conveyed by airflow to determine whether the fibers are deposited in the pipeline. If deposition occurs, the airflow conveying velocity is adjusted and the airflow conveying velocity is corrected in real time during actual conveying.

[0013] S4. Roving: The fiber bundle is stretched and thinned according to the drafting multiple, and the stretched fibers are twisted to form roving.

[0014] S5. Twisting yarn making: Calculate the coefficient of variation of the roving, determine whether the uniformity of the twisting process is qualified, and then make fancy yarn.

[0015] S6. Analysis of the uniformity of the fleece surface: Obtain the image of the fleece surface of the fancy yarn, determine whether the fleece surface uniformity of the fancy yarn is qualified, and then send a feedback signal.

[0016] Preferably, the specific operation process of the fiber pretreatment is: obtain the type of fiber raw material, record it as each fiber raw material, match each fiber raw material with the corresponding regain target value of each type of fiber raw material stored in the management database, obtain the regain target value of each fiber raw material, measure the weight of each fiber raw material, add lubricant in proportion according to the weight of each fiber raw material, and extract a sample of set weight from each part of each fiber raw material, use a moisture meter to obtain the regain of each part of each fiber raw material, and obtain the regain of each fiber raw material after average calculation.

[0017] The moisture regain difference of each fiber raw material is obtained by subtracting the moisture regain of each fiber raw material from the moisture regain target value of each fiber raw material, and a moisture regain difference threshold is set. The fiber raw materials whose moisture regain difference is greater than the set moisture regain difference threshold are screened out and recorded as balanced-treated fiber raw materials. They are placed in a specific humidity environment for moisture regain balance treatment.

[0018] Preferably, the specific operation process of the fiber mixing is: define the regain ranges according to the preset values, group the pretreated fiber raw materials according to the regain ranges, record them as groups of fibers, determine the mixing time according to the weight of each group of fibers, and use a low-speed stirring mixing equipment to perform preliminary mixing in groups, and put the preliminary mixed groups of fibers into the main mixing equipment according to the preset formula ratio for multi-group mixing to form a group of mixed fibers.

[0019] Prepare a fiber mixed standard sample, use a light scattering monitor to measure the light scattering of the fiber mixed standard sample, and obtain the light scattering intensity of the fiber mixed standard sample at each angle, which is recorded as , Indicates The number of angles, According to the preset equal time interval principle, each detection time point is set in the multi-group mixing process, and the set wavelength of light is emitted to the fiber at each detection time point. The detector is used to measure the light scattering intensity of the fiber at each detection time point at each angle. , Indicates The number of the detection time point, .

[0020] Preferably, the specific operation process of judging the uniformity of fiber mixing is as follows: according to the light scattering intensity of the fiber mixing standard sample at each angle , fiber light scattering intensity at each angle at each detection time point Calculate the mixing uniformity of the fibers at each testing time point ,in Indicates the number of angles, It represents the average light scattering intensity of the fiber at each detection time point. The weight factors representing the light scattering intensity and the light scattering intensity fluctuation degree are respectively expressed by the formula Calculate the difference in fiber mixing uniformity over time, Indicates The mixing uniformity at each detection time point is measured. If the difference in the mixing uniformity of the fibers over time is a positive value, it is judged that the mixing process is moving in the direction of uniform mixing, and mixing continues until the mixing uniformity reaches the preset ideal mixing uniformity value. If it is a negative value, it indicates that there is a problem in the mixing process, and it is necessary to stop mixing and adjust the parameters of the mixing equipment.

[0021] Preferably, the specific operation process of judging whether the fibers are deposited in the pipeline is as follows: multiple groups of mixed fibers are recorded as mixed fibers, a set amount of mixed fibers are selected from them as fiber conveying samples, and the mixed fibers are placed in the hopper of the airflow conveying equipment, and the airflow conveying equipment is set and started according to the preliminary conveying flow rate determined by computer simulation, and flow monitoring devices are installed at the inlet and outlet of the airflow conveying pipeline respectively to obtain the inlet flow and outlet flow of the fiber conveying, and the fiber conveying flow difference is obtained by subtracting, and a fiber conveying flow difference threshold is set; if the fiber conveying flow difference is greater than or equal to the fiber conveying flow difference threshold, it is judged that the fibers are deposited in the pipeline and the airflow conveying flow rate needs to be adjusted.

[0022] Preferably, the specific operation process of adjusting the airflow conveying velocity is: with a fixed flow rate as the increase amplitude, gradually increase the airflow conveying velocity, and obtain in real time the fiber conveying flow rate difference after each increase in the flow rate; when the fiber conveying flow rate difference is lower than a preset fiber conveying flow rate difference threshold, obtain the corresponding airflow conveying velocity and record it as the suitable airflow conveying velocity.

[0023] Preferably, the specific operation process of real-time correction of the airflow conveying velocity is: adjust the airflow conveying equipment according to the appropriate airflow conveying velocity, set each position point in the airflow conveying pipeline according to the principle of equidistant spacing, convey the mixed fiber to the next process through airflow, obtain the airflow conveying velocity at each position point during the airflow conveying process, compare it with the appropriate airflow conveying velocity to obtain the airflow conveying velocity difference at each position point, and correct the airflow conveying velocity at each position point through the installed airflow regulating device.

[0024] Preferably, the specific operation process of the roving is: the fibers transported by the air flow are evenly fed into the drafting device of the roving frame through the fiber guiding device, the average fineness of the fibers is obtained by a fiber measuring instrument, the drafting multiple is obtained by dividing the linear density required by the roving by the average fineness of the fibers, and the drafting multiple of the drafting device is set accordingly to stretch and thin the fiber bundles, and twist the drafted fibers to form roving.

[0025] Each roving sample is randomly selected from the twisted roving, and one end of each roving sample is fixed on a chuck of the twist meter. The twist meter is started, and each roving sample is twisted back to the initial untwisted state by rotating the movable chuck at a set speed. The number of twists per unit length of each roving sample is obtained and recorded as the twist number of each roving sample , Indicates The number of the roving sample, .

[0026] Preferably, the specific operation process of twisting yarn making is: calculating the coefficient of variation of roving The calculation formula of the coefficient of variation is ,in It represents the average twist number of the roving sample. The coefficient of variation threshold is set for the number of roving samples, and the coefficient of variation of the roving is compared with the coefficient of variation threshold. If the coefficient of variation of the roving is less than the coefficient of variation threshold, it means that the fluctuation degree of the roving twist in the direction of the yarn length meets the requirements and the uniformity of the twisting process is qualified. Otherwise, it means that the uniformity of the twisting process is unqualified and the twisting equipment needs to be calibrated and re-twisted.

[0027] The obtained rovings are combined, and are again drawn and twisted through a spinning frame to obtain the desired yarn, which is then formed into fancy yarn according to design requirements.

[0028] Preferably, the specific analysis process of the wool surface uniformity analysis is: obtaining the wool surface image of the fancy yarn, graying it, setting the gray value threshold, separating the wool fiber area and the background area by binarization, dividing the wool fiber area into wool fiber sub-areas, traversing each wool fiber sub-area to count the number of pixels, and obtaining the total number of pixels of the wool surface image at the same time, calculating the ratio of the number of pixels counted in each wool fiber sub-area to the total number of pixels to obtain the wool fiber coverage density of each sub-area, which is recorded as , Indicates The number of the sub-regions, , calculate the uniformity of the fleece surface of the fancy yarn ,in It indicates the number of sub-areas, sets the hair surface uniformity threshold, compares the hair surface uniformity of the fancy yarn with the hair surface uniformity threshold, if the hair surface uniformity of the fancy yarn is greater than or equal to the hair surface uniformity threshold, it means that the hair surface uniformity of the fancy yarn is qualified, otherwise it means that the hair surface uniformity of the fancy yarn is unqualified, and feedback is given on the qualified degree of the hair surface uniformity of the fancy yarn.

[0029] Compared with the prior art, the embodiments of the present invention have at least the following advantages or beneficial effects: 1. The present invention performs preliminary mixing and multi-group mixing on the fibers in sequence, and determines the uniformity of the fiber mixing. Different fibers have different physical and chemical properties. Preliminary mixing and multi-group mixing can make these fibers evenly distributed in the yarn, avoiding local performance differences caused by fiber aggregation.

[0030] 2. The present invention performs air flow conveying on mixed fibers, adjusts the air flow conveying velocity when the fibers are deposited in the pipeline, and performs real-time correction on the air flow conveying velocity during actual conveying. By adjusting the air flow conveying velocity during deposition, the fibers can be suspended in the air flow again to avoid blockage. Real-time correction of the air flow conveying velocity can adjust the conveying state of the fibers according to these changes, so that the fibers always maintain a stable suspension and motion state, ensuring uniform conveying.

[0031] 3. The present invention calculates the coefficient of variation of the roving to determine whether the uniformity of the twisting process is qualified, and then produces fancy yarn. Twisting is the process of making the fibers in the yarn embrace together. The twist uniformity directly affects the structural uniformity of the yarn. By calculating the coefficient of variation to determine the uniformity of the twisting process, it can be ensured that the twist distribution of the yarn in the length direction is uniform, so that the fibers in the yarn are arranged neatly and tightly, ensuring the stability and uniformity of the yarn structure.

[0032] 4. The present invention obtains the hair surface image of the fancy yarn, determines whether the hair surface uniformity of the fancy yarn is qualified, and then sends a feedback signal. By obtaining the hair surface image, the distribution of fibers on the yarn surface can be intuitively observed to ensure that the produced fancy yarn meets the quality standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0034] Figure 1 It is a schematic diagram of the method flow of the present invention.

[0035] Figure 2 for Figure 1 Schematic diagram of the process of step S1 in FIG.

[0036] Figure 3 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] See also Figure 1 As shown, the present invention provides a method for controlling the uniformity of the fancy yarn hair surface, the method comprising the following steps: S1. Fiber pretreatment: obtaining the moisture regain of each fiber raw material, and performing moisture regain balance treatment on it.

[0039] See also Figure 2 As shown, the specific operation process of the fiber pretreatment is: obtaining the type of fiber raw material, recorded as each fiber raw material, matching each fiber raw material with the corresponding regain target value of each type of fiber raw material stored in the management database to obtain the regain target value of each fiber raw material, measuring the weight of each fiber raw material, adding lubricant in proportion according to the weight of each fiber raw material, and extracting a set weight of sample from each part of each fiber raw material, using a moisture meter to obtain the regain of each part of each fiber raw material, and obtaining the regain of each fiber raw material after average calculation; providing an accurate basis for subsequent regain balance processing. If there is no accurate measurement of the regain of each part, it may lead to insufficient or excessive regain balance processing.

[0040] The moisture regain difference of each fiber raw material is obtained by subtracting the moisture regain of each fiber raw material from the moisture regain target value, and a moisture regain difference threshold is set. The fiber raw materials whose moisture regain difference is greater than the set moisture regain difference threshold are screened out and recorded as balanced-treated fiber raw materials, which are placed in a specific humidity environment for moisture regain balancing treatment. During the entire production process, the moisture regain of all fiber raw materials is within an appropriate range, which helps to ensure the quality stability of the product between batches.

[0041] It should be noted that the specific analysis method of the regain balance treatment is: according to the preset equal time interval principle, several time points are set in the regain balance process, the moisture regain of each balanced treated fiber raw material at each time point is obtained, and the regain is subtracted from the moisture regain target value of each fiber raw material to obtain the regain difference of each balanced treated fiber raw material at each time point; when the moisture regain difference of a balanced treated fiber raw material at a certain time point is less than or equal to the set moisture regain difference threshold, it is judged that the balance treatment of the fiber raw material is completed, thereby completing the balance treatment of each balanced treated fiber raw material.

[0042] S2. Fiber mixing: Perform preliminary mixing and multiple group mixing of the fibers in sequence, and determine the uniformity of the fiber mixing.

[0043] The specific operation process of the fiber mixing is: define each regain range according to the preset, group each pretreated fiber raw material according to each regain range, record it as each group of fibers, determine the mixing time according to the weight of each group of fibers, and use a low-speed stirring mixing device to group and perform preliminary mixing, and put each group of preliminarily mixed fibers into the main mixing device according to the preset formula ratio for multiple group mixing to form a group of mixed fibers; grouping can group fiber raw materials with similar regain characteristics into one group, which is helpful to better control the uniformity of mixing in the subsequent mixing process, because fiber raw materials with similar regains are more likely to blend with each other during mixing, avoiding unevenness caused by excessive differences in regain.

[0044] Prepare a fiber mixed standard sample, use a light scattering monitor to measure the light scattering of the fiber mixed standard sample, and obtain the light scattering intensity of the fiber mixed standard sample at each angle, which is recorded as , Indicates The number of angles, According to the preset equal time interval principle, each detection time point is set in the multi-group mixing process, and the set wavelength of light is emitted to the fiber at each detection time point. The detector is used to measure the light scattering intensity of the fiber at each detection time point at each angle. , Indicates The number of the detection time point, ; Light scattering measurement can reflect the structure and distribution of fibers at different angles. By measuring standard samples, a light scattering intensity model under an ideal mixing state can be established.

[0045] The specific operation process of judging the uniformity of fiber mixing is as follows: according to the light scattering intensity of the fiber mixing standard sample at each angle , fiber light scattering intensity at each angle at each detection time point Calculate the mixing uniformity of the fibers at each testing time point ,in Indicates the number of angles, It represents the average light scattering intensity of the fiber at each detection time point. The weight factors representing the light scattering intensity and the light scattering intensity fluctuation degree are respectively expressed by the formula Calculate the difference in fiber mixing uniformity over time, Indicates The mixing uniformity at each detection time point is measured. If the difference in the mixing uniformity of the fibers over time is a positive value, it is judged that the mixing process is developing in the direction of uniform mixing, and the mixing is continued until the mixing uniformity reaches the preset ideal value of mixing uniformity. If it is a negative value, it means that there is a problem in the mixing process, and it is necessary to stop mixing and adjust the parameters of the mixing equipment. By calculating the difference in the mixing uniformity over time, the development direction of the mixing process can be judged. A positive value indicates that it is developing in the direction of uniform mixing, and a negative value indicates that there is a problem in the mixing process.

[0046] It should be noted that in the formula for the mixing uniformity of the fibers at each testing time point, It indicates the absolute difference between the light scattering intensity of the actual fiber at each angle and the light scattering intensity of the standard sample. The greater the deviation, the worse the uniformity of the actual fiber mixing. It is calculated as the reciprocal of the mean square error, which is used to measure the degree of discreteness of a set of data. Here, the mean square error of the light scattering intensity reflects the fluctuation of the light scattering intensity of the fiber at various angles. Taking the reciprocal of the mean square error here means that the smaller the difference between the actual fiber light scattering intensity at each angle and the average value, the larger the value of this part, and the greater its contribution to the overall result in the formula, that is, the more conducive it is to improving the calculated mixing uniformity value, which is consistent with the actual situation, because a more stable light scattering intensity corresponds to better fiber mixing uniformity.

[0047] It should be noted that, in a specific embodiment, It can be set to 0.6. It can be set to 0.4. The light scattering intensity is directly related to the structural inhomogeneity inside the fiber. If the fiber is mixed unevenly, there will be different scattering centers in different areas, which will lead to significant changes in the overall light scattering intensity. The degree of light scattering intensity fluctuation reflects more local inhomogeneity. Although local inhomogeneity is also part of the mixing uniformity, it may only be a local deviation compared to the overall light scattering intensity, so the corresponding weight of the light scattering intensity is greater.

[0048] It should be noted that the specific operating method for adjusting the parameters of the mixing equipment is: adjusting the mixing mode of the main mixing equipment to intermittent stirring, selecting each intermittent time interval for testing, and in each test, keeping other mixing conditions unchanged, performing uniformity testing on each mixed fiber sample, and selecting the intermittent time interval corresponding to the fiber sample with the highest uniformity to adjust the mixing frequency of the main mixing equipment; allowing the raw materials to have a certain amount of time for self-adjustment and redistribution when stirring stops, which helps to improve the degree of mixing uniformity.

[0049] S3. Airflow conveying monitoring: The mixed fibers are conveyed by airflow to determine whether the fibers are deposited in the pipeline. If deposition occurs, the airflow conveying velocity is adjusted and the airflow conveying velocity is corrected in real time during actual conveying.

[0050] The specific operation process of judging whether the fiber is deposited in the pipeline is as follows: a plurality of groups of mixed fibers are recorded as mixed fibers, a set amount of mixed fibers are selected from the mixed fibers as fiber conveying samples, and the mixed fibers are placed in a hopper of an airflow conveying device, and the airflow conveying device is set and started according to a preliminary conveying flow rate determined by computer simulation, and flow monitoring devices are installed at the inlet and outlet of the airflow conveying pipeline respectively to obtain the inlet flow rate and outlet flow rate of the fiber conveying, and a fiber conveying flow difference is obtained by subtracting the difference, and a fiber conveying flow difference threshold is set; if the fiber conveying flow difference is greater than or equal to the fiber conveying flow difference threshold, it is judged that the fiber is deposited in the pipeline and the airflow conveying flow rate needs to be adjusted; the deposition of the fibers in the pipeline can be discovered in time to avoid further deterioration of the deposition problem, thereby preventing more serious problems such as pipeline blockage.

[0051] The specific operation process of adjusting the airflow conveying velocity is: gradually increasing the airflow conveying velocity with a fixed flow rate as the increase amplitude, and obtaining the fiber conveying flow difference after each increase in the flow rate in real time; when the fiber conveying flow difference is lower than the preset fiber conveying flow difference threshold, obtaining the corresponding airflow conveying velocity, which is recorded as the suitable airflow conveying velocity; gradually increasing the airflow conveying velocity with a fixed flow rate as the increase amplitude can systematically change the conveying conditions to find a suitable airflow conveying velocity and ensure the efficiency and quality of fiber conveying.

[0052] The specific operation process of real-time correction of the airflow conveying velocity is as follows: the airflow conveying equipment is adjusted according to the appropriate airflow conveying velocity, each position point is set in the airflow conveying pipeline according to the principle of equidistant spacing, the mixed fiber is conveyed to the next process through the airflow, and the airflow conveying velocity at each position point during the airflow conveying process is obtained, and it is compared with the appropriate airflow conveying velocity to obtain the airflow conveying velocity difference at each position point, so as to correct the airflow conveying velocity at each position point through the installed airflow regulating device; so that the fiber conveying conditions in the entire pipeline are more uniform, avoiding fiber deposition or uneven conveying caused by abnormal local flow velocity.

[0053] S4. Roving: The fiber bundle is stretched and thinned according to the drafting multiple, and the stretched fibers are twisted to form roving.

[0054] The specific operation process of the roving is as follows: the fibers transported by the air flow are evenly fed into the drafting device of the roving frame through the fiber guide device, the average fineness of the fibers is obtained by the fiber measuring instrument, the drafting multiple is obtained by dividing the linear density required by the roving by the average fineness of the fibers, and the drafting multiple of the drafting device is set accordingly, the fiber bundle is stretched and thinned, and the drafted fibers are twisted to form roving; the drafting multiple directly affects the thickness of the roving, and by accurately calculating and setting the drafting multiple, the linear density of the produced roving can meet the expected requirements, ensure the stability of product quality, meet the requirements of subsequent processes (such as spinning processes, etc.) for roving, and improve the efficiency of the entire spinning production process and the product qualification rate.

[0055] Each roving sample is randomly selected from the twisted roving, and one end of each roving sample is fixed on a chuck of the twist meter. The twist meter is started, and each roving sample is twisted back to the initial untwisted state by rotating the movable chuck at a set speed. The number of twists per unit length of each roving sample is obtained and recorded as the twist number of each roving sample , Indicates The number of the roving sample, The number of twists directly affects the strength, elasticity and other properties of the roving. By measuring the number of twists, it is possible to determine whether the twisting process meets the requirements, and then adjust and optimize the twisting process to ensure the stability of the roving quality and ensure that the roving can operate normally in subsequent processing steps. For example, in the spinning process, the twist number of the roving must be appropriate to ensure smooth drafting and twisting of the roving.

[0056] S5. Twisting yarn making: Calculate the coefficient of variation of the roving, determine whether the uniformity of the twisting process is qualified, and then make fancy yarn.

[0057] The specific operation process of twisting yarn making is as follows: Calculate the coefficient of variation of the roving The calculation formula of the coefficient of variation is ,in It represents the average twist number of the roving sample. The coefficient of variation threshold is set for the number of roving samples, and the coefficient of variation of the roving is compared with the coefficient of variation threshold. If the coefficient of variation of the roving is less than the coefficient of variation threshold, it means that the fluctuation degree of the roving twist in the direction of the yarn length meets the requirements and the uniformity of the twisting process is qualified. Otherwise, it means that the uniformity of the twisting process is unqualified and the twisting equipment needs to be calibrated and re-twisted. If the coefficient of variation is less than the threshold, it means that the uniformity of the twisting meets the requirements and the product quality meets the standard in terms of twist uniformity, and the next process can be entered. If the coefficient of variation is greater than the threshold, this quantitative evaluation method can be used to accurately judge the possible problems of the twisting equipment, so as to calibrate the twisting equipment in a targeted manner, avoid unqualified products from flowing into subsequent processes, and improve the overall quality of the yarn.

[0058] It should be noted that in the formula for the coefficient of variation of roving, the squared deviations of the twist counts of each roving sample are summed to obtain , reflects the degree of dispersion of the twist counts of all samples relative to the average value. The greater the dispersion, the greater the difference between the samples. Divide it by the number of samples. ,Right now The variance of the sample is obtained, and the standard deviation of the sample is obtained by taking the square root of the variance, which can more intuitively reflect the degree of discreteness of the data. The coefficient of variation is obtained by dividing the standard deviation by the mean value. The coefficient of variation is a relative indicator, which eliminates the influence of the data dimension, so that the degree of discreteness between data of different magnitudes or units can be compared. The smaller the coefficient of variation, the more stable the twist number of the roving is and the better the uniformity is. Conversely, the larger the coefficient of variation, the greater the fluctuation of the twist number of the roving is and the worse the uniformity is.

[0059] The obtained rovings are combined, stretched and twisted again through a spinning frame to obtain the required yarn, and then formed into fancy yarn according to the design requirements. As for the quality of the yarn, the further stretching and twisting can make the yarn fineness meet the design requirements more accurately, and improve the strength, elasticity and other properties of the yarn. Combining the rovings can reduce the unevenness of the yarn, make the yarn appearance more uniform and smooth, and reduce defects.

[0060] S6. Analysis of the uniformity of the fleece surface: Obtain the image of the fleece surface of the fancy yarn, determine whether the fleece surface uniformity of the fancy yarn is qualified, and then send a feedback signal.

[0061] The specific analysis process of the wool surface uniformity analysis is as follows: obtaining the wool surface image of the fancy yarn, graying it, setting the gray value threshold, separating the wool fiber area and the background area through binarization, dividing the wool fiber area into wool fiber sub-areas, traversing each wool fiber sub-area to count the number of pixels, and obtaining the total number of pixels of the wool surface image at the same time, calculating the ratio of the number of pixels counted in each wool fiber sub-area to the total number of pixels to obtain the wool fiber coverage density of each sub-area, recorded as , Indicates The number of the sub-regions, , calculate the uniformity of the fleece surface of the fancy yarn ,in Indicates the number of sub-areas, sets a hair surface uniformity threshold, compares the hair surface uniformity of the fancy yarn with the hair surface uniformity threshold, if the hair surface uniformity of the fancy yarn is greater than or equal to the hair surface uniformity threshold, it means that the hair surface uniformity of the fancy yarn is qualified, otherwise it means that the hair surface uniformity of the fancy yarn is unqualified, and feedback is given on the qualified degree of the hair surface uniformity of the fancy yarn; accurately describes the distribution density of wool fibers in each sub-area in the form of data, which is convenient for comparison between different sub-areas and provides basic data for calculating the hair surface uniformity. The hair surface uniformity of the fancy yarn is calculated by combining the hair fiber coverage density of each sub-area. If the hair surface uniformity is qualified, it means that the product meets the requirements and can enter the next process or be put on the market. If it is unqualified, the production process can be adjusted in time, such as adjusting the distribution method of the wool fibers or the spinning process, so as to improve the product quality.

[0062] It should be noted that in the formula for the uniformity of the wool surface of fancy yarn, Indicates The relative deviation of the wool fiber coverage density of each sub-region with respect to the average coverage density reflects the degree to which the wool fiber coverage density of the sub-region deviates from the overall average level, and is standardized based on the average coverage density to facilitate comparison between different data. The square root of the average value of the above relative deviation is then taken and the inverse is taken, that is, the variance of the wool fiber coverage density is calculated. The larger the value obtained after taking the inverse, the more concentrated the data is near the average value, that is, the more uniform the wool fiber coverage density of each sub-region is.

[0063] The present invention performs preliminary mixing and multi-group mixing on fibers in sequence, judges the mixing uniformity of the fibers, performs air flow conveying on the mixed fibers, adjusts the air flow conveying velocity when the fibers are deposited in a pipeline, and performs real-time correction on the air flow conveying velocity during actual conveying, calculates the coefficient of variation of the roving, judges whether the uniformity of the twisting process is qualified, and then prepares the fancy yarn, obtains the hair surface image of the fancy yarn, judges whether the hair surface uniformity of the fancy yarn is qualified, and then sends a feedback signal, so as to accurately control the hair surface uniformity of the fancy yarn and maintain the stability of product quality.

[0064] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention and they are still covered by the protection scope of the present invention.

Claims

1. A method for controlling the uniformity of the hair surface of a fancy yarn, characterized in that: The steps include: S1. Fiber pretreatment: obtaining the moisture regain of each fiber raw material and performing moisture regain balance treatment on it; S2. Fiber mixing: Preliminary mixing of fibers, multiple group mixing, and determination of fiber mixing uniformity; S3. Air flow monitoring: air flow is performed on the mixed fibers to determine whether the fibers are deposited in the pipeline. If so, the air flow velocity is adjusted and the air flow velocity is corrected in real time during actual transportation. S4. roving: the fiber bundle is stretched and thinned according to the drafting multiple, and the drafted fibers are twisted to form roving; S5. Twisting yarn making: Calculate the coefficient of variation of the roving, determine whether the uniformity of the twisting process is qualified, and then make fancy yarn; S6. Analysis of the uniformity of the fleece surface: Obtain the image of the fleece surface of the fancy yarn, determine whether the fleece surface uniformity of the fancy yarn is qualified, and then send a feedback signal.

2. A method for controlling the uniformity of the fancy yarn surface according to claim 1, characterized in that: The specific operation process of the fiber pretreatment is: Obtain the types of fiber raw materials, recorded as various fiber raw materials, match each fiber raw material with the corresponding moisture regain target values ​​of various types of fiber raw materials stored in the management database to obtain the moisture regain target value of each fiber raw material, measure the weight of each fiber raw material, add lubricant in proportion according to the weight of each fiber raw material, extract a set weight of sample from each part of each fiber raw material, use a moisture meter to obtain the moisture regain of each part of each fiber raw material, and obtain the moisture regain of each fiber raw material after average calculation; The moisture regain difference of each fiber raw material is obtained by subtracting the moisture regain of each fiber raw material from the moisture regain target value of each fiber raw material, and a moisture regain difference threshold is set. The fiber raw materials whose moisture regain difference is greater than the set moisture regain difference threshold are screened out and recorded as balanced-treated fiber raw materials. They are placed in a specific humidity environment for moisture regain balance treatment.

3. A method for controlling the uniformity of the fancy yarn surface according to claim 1, characterized in that: The specific operation process of the fiber mixing is as follows: Determine each moisture regain range according to the preset, group each pretreated fiber raw material according to each moisture regain range, record it as each group of fibers, determine the mixing time according to the weight of each group of fibers, use a low-speed stirring mixing device to perform preliminary mixing in groups, and put each group of preliminarily mixed fibers into a main mixing device according to a preset formula ratio for multiple group mixing to form a group of mixed fibers; Prepare a fiber mixed standard sample, use a light scattering monitor to measure the light scattering of the fiber mixed standard sample, and obtain the light scattering intensity of the fiber mixed standard sample at each angle, which is recorded as , Indicates The number of angles, According to the preset equal time interval principle, each detection time point is set in the multi-group mixing process, and the set wavelength of light is emitted to the fiber at each detection time point. The detector is used to measure the light scattering intensity of the fiber at each detection time point at each angle. , Indicates The number of the detection time point, .

4. A method for controlling the uniformity of the fancy yarn surface according to claim 3, characterized in that: The specific operation process of judging the uniformity of fiber mixing is as follows: According to the light scattering intensity of the fiber mixed standard sample at each angle , fiber light scattering intensity at each angle at each detection time point Calculate the mixing uniformity of the fibers at each testing time point ,in Indicates the number of angles, It represents the average light scattering intensity of the fiber at each detection time point. The weight factors representing the light scattering intensity and the light scattering intensity fluctuation degree are respectively expressed by the formula Calculate the difference in fiber mixing uniformity over time, Indicates The mixing uniformity at each detection time point is measured. If the difference in the mixing uniformity of the fibers over time is a positive value, it is judged that the mixing process is moving in the direction of uniform mixing, and mixing continues until the mixing uniformity reaches the preset ideal mixing uniformity value. If it is a negative value, it indicates that there is a problem in the mixing process, and it is necessary to stop mixing and adjust the parameters of the mixing equipment.

5. A method for controlling the uniformity of the fancy yarn surface according to claim 1, characterized in that: The specific operation process of judging whether the fiber is deposited in the pipeline is as follows: A plurality of groups of mixed fibers are recorded as mixed fibers, and a set amount of mixed fibers are selected from them as fiber conveying samples, which are placed in the hopper of the airflow conveying equipment. The airflow conveying equipment is set and started according to the preliminary conveying flow rate determined by computer simulation, and flow monitoring devices are installed at the inlet and outlet of the airflow conveying pipeline respectively to obtain the inlet flow and outlet flow of the fiber conveying, and the fiber conveying flow difference is obtained by subtracting it, and a fiber conveying flow difference threshold is set. If the fiber conveying flow difference is greater than or equal to the fiber conveying flow difference threshold, it is judged that the fibers are deposited in the pipeline and the airflow conveying flow rate needs to be adjusted.

6. A method for controlling the uniformity of the fancy yarn surface according to claim 5, characterized in that: The specific operation process of adjusting the air flow delivery velocity is as follows: With a fixed flow rate as the increase amplitude, the airflow conveying velocity is gradually increased, and the fiber conveying flow rate difference after each increase in the flow rate is obtained in real time. When the fiber conveying flow rate difference is lower than the preset fiber conveying flow rate difference threshold, the corresponding airflow conveying velocity is obtained and recorded as the appropriate airflow conveying velocity.

7. A method for controlling the uniformity of the fancy yarn surface according to claim 6, characterized in that: The specific operation process of real-time correction of the air flow delivery velocity is as follows: The airflow conveying equipment is adjusted according to the appropriate airflow conveying velocity, and each position point is set in the airflow conveying pipeline according to the principle of equidistant spacing. The mixed fiber is conveyed to the next process through airflow, and the airflow conveying velocity at each position point during the airflow conveying process is obtained. The airflow conveying velocity difference at each position point is obtained by comparing it with the appropriate airflow conveying velocity, and the airflow conveying velocity difference at each position point is corrected by the installed airflow regulating device.

8. A method for controlling the uniformity of the fancy yarn surface according to claim 1, characterized in that: The specific operation process of the roving is: The fibers transported by the air flow are uniformly fed into the drafting device of the roving frame through the fiber guide device, and the average fineness of the fibers is obtained by the fiber measuring instrument. The drafting multiple is obtained by dividing the linear density required by the roving by the average fineness of the fibers. The drafting multiple of the drafting device is set accordingly, the fiber bundle is stretched and thinned, and the drafted fibers are twisted to form roving; Each roving sample is randomly selected from the twisted roving, and one end of each roving sample is fixed on a chuck of the twist meter. The twist meter is started, and each roving sample is twisted back to the initial untwisted state by rotating the movable chuck at a set speed. The number of twists per unit length of each roving sample is obtained and recorded as the twist number of each roving sample , Indicates The number of the roving sample, .

9. A method for controlling the uniformity of the fancy yarn surface according to claim 8, characterized in that: The specific operation process of the twisting yarn making is: Calculate the coefficient of variation of roving The calculation formula of the coefficient of variation is ,in It represents the average twist number of the roving sample. The coefficient of variation threshold is set for the number of roving samples, and the coefficient of variation of the roving is compared with the coefficient of variation threshold. If the coefficient of variation of the roving is less than the coefficient of variation threshold, it means that the fluctuation degree of the roving twist in the yarn length direction meets the requirements and the uniformity of the twisting process is qualified. Otherwise, it means that the uniformity of the twisting process is unqualified and the twisting equipment needs to be calibrated and re-twisted; The obtained rovings are combined, and are again drawn and twisted through a spinning frame to obtain the desired yarn, which is then formed into fancy yarn according to design requirements.

10. A method for controlling the uniformity of the fancy yarn surface according to claim 1, characterized in that: The specific analysis process of the rough surface uniformity analysis is as follows: The wool surface image of the fancy yarn is obtained, grayscaled, and the grayscale value threshold is set. The wool fiber area and the background area are separated by binarization, and the wool fiber area is divided into wool fiber sub-areas. The number of pixels in each wool fiber sub-area is traversed and counted. At the same time, the total number of pixels in the wool surface image is obtained, and the ratio of the number of pixels counted in each wool fiber sub-area to the total number of pixels is calculated to obtain the wool fiber coverage density of each sub-area, which is recorded as , Indicates The number of the sub-regions, , calculate the uniformity of the fleece surface of the fancy yarn ,in It indicates the number of sub-areas, sets the hair surface uniformity threshold, compares the hair surface uniformity of the fancy yarn with the hair surface uniformity threshold, if the hair surface uniformity of the fancy yarn is greater than or equal to the hair surface uniformity threshold, it means that the hair surface uniformity of the fancy yarn is qualified, otherwise it means that the hair surface uniformity of the fancy yarn is unqualified, and feedback is given on the qualified degree of the hair surface uniformity of the fancy yarn.

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