Camel hair knitted fabric preparation method based on continuous process path

Abstract

The invention relates to the technical field of camel hair knitted fabric preparation, in particular to a camel hair knitted fabric preparation method based on a continuous process path, and the method comprises the following steps: determining initial parameters of carding and drawing based on the fiber density and uniformity of a mixed fiber flow; the initial draft multiple is adjusted by detecting the mass of the carded slivers and calculating the fiber density change rate and the fiber uniformity change rate of the carded slivers relative to the mixed fiber flow; the initial parameters of yarn twisting and weaving are intelligently determined based on the yarn evenness variation coefficient; the initial knitting speed is adjusted by detecting evenness and yarn uniformity variable coefficients and calculating a first variable coefficient change rate and a second variable coefficient change rate; determining the initial drying temperature of the drying stage based on the fabric shrinkage rate before setting; and calculating the shrinkage change rate according to the shrinkage rate of the fabric before setting and the shrinkage rate of the fabric after setting. According to the preparation method of the camel hair knitted fabric, the production efficiency and the product quality stability can be improved.

Description

Technical Field

[0001] This invention relates to the field of camel hair knitted fabric preparation technology, and in particular to a method for preparing camel hair knitted fabric based on a continuous process path. Background Technology

[0002] Camel hair, a precious natural protein fiber, is highly valued in the high-end knitwear industry due to its characteristics such as softness, fluffiness, excellent warmth, gentle luster, and skin-friendliness. However, the relatively smooth scale structure on the surface of camel hair fibers, along with their shorter fiber length and uneven strength, presents bottlenecks in actual processing, including difficulties in spinning, unstable yarn quality, and low production efficiency.

[0003] Currently, the industry generally employs a segmented, intermittent production process for camel hair knitted fabrics. Specifically, fiber mixing, carding, drawing, spinning, weaving, and finishing processes are typically carried out independently, with numerous material transfers, intermediate storage, and re-preparation steps between each process. This production method not only results in long production cycles, high energy consumption, and high labor demands, but also, due to the independence of the process environment and parameters at each stage, makes it difficult to promptly capture and correct quality fluctuations during production. For example, in the carding process, deviations in the density and uniformity of the fiber web often only become apparent after the entire batch has been carded, through offline testing. By this time, a large number of semi-finished products already have potential quality issues. Similarly, in the spinning and weaving stages, fluctuations in key parameters such as yarn tension, evenness, and fabric weight lack online real-time control methods, ultimately leading to poor quality consistency between fabric batches and difficulty in improving the yield of superior products.

[0004] Chinese Patent Publication No. CN117364334A discloses a moisture-wicking and antibacterial fabric and its preparation method. The relevant technical solution includes the following steps: 1. Blending parts by weight of profiled polyester fiber and fine cotton to obtain blended yarn A; blending parts by weight of bamboo charcoal fiber and modal fiber to obtain blended yarn B; 2. Simultaneously feeding blended yarn A and blended yarn B into a weft knitting machine for bending and looping, so that blended yarn A is on the outer layer and blended yarn B is on the inner layer, to obtain a grey fabric; 3. After dyeing, dehydrating, and drying the grey fabric, continuously running it in a finishing solution, and then drying it; the dried base fabric is then subjected to antibacterial finishing by padding, dried, and stretched for setting. Although the relevant technical solution discloses a continuous production process path, it lacks real-time monitoring of the production process and collaborative control based on monitoring results, which may affect the final fabric quality.

[0005] Therefore, there is an urgent need for a camel hair fabric preparation method that can achieve efficient, stable, and high-quality transformation from raw materials to greige fabric, while simultaneously monitoring and coordinating the continuous production process in real time to improve the linkage of process parameters and the real-time feedback adjustment between each process, thereby enhancing process stability and production efficiency. Summary of the Invention

[0006] To address this, the present invention provides a method for preparing camel hair knitted fabrics based on a continuous process path, thereby solving the problems of unstable production process and low production efficiency in the preparation of camel hair knitted fabrics in the prior art, which uses segmented intermittent processes and lacks monitoring and analysis control.

[0007] To achieve the above objectives, the present invention provides a method for preparing camel hair knitted fabric based on a continuous process path, comprising: The pretreated camel hair fibers are mixed with auxiliary fibers to obtain a mixed fiber flow. The mixed fiber flow is detected to determine the corresponding mixed fiber density and mixed fiber uniformity. Based on the mixed fiber density and mixed fiber uniformity, the carding speed of the carding machine and the initial draft ratio of the drawing frame are determined. The mixed fiber flow is processed based on the carding speed to obtain a carded sliver. The carded sliver is detected to determine the corresponding sliver fiber density and sliver fiber uniformity. The initial draw ratio is adjusted based on the comparison between the sliver fiber density and the mixed fiber density, as well as the sliver fiber uniformity and the mixed fiber uniformity. The carded sliver is processed based on the adjusted draft ratio to obtain a drawn sliver evenness. The drawn sliver evenness is detected to determine the corresponding evenness variation coefficient. Based on the evenness variation coefficient, the twisting speed of the twisting machine and the initial knitting speed of the knitting machine are determined. The yarn is obtained by processing the sliver evenness based on the twisting speed, the yarn is detected to determine the corresponding yarn evenness variation coefficient, and the initial weaving speed is adjusted based on the comparison between the yarn evenness variation coefficient and the evenness variation coefficient. The yarn is processed based on the adjusted weaving speed to obtain fabric, the fabric is detected to determine the corresponding fabric shrinkage rate, and the setting temperature during the setting process and the initial drying temperature during the drying process are determined based on the fabric shrinkage rate. The fabric is treated based on the setting temperature, and the treated fabric is detected to determine the corresponding fabric shrinkage rate. The initial drying temperature is then adjusted based on the change in the fabric shrinkage rate. Camel hair knitted fabric is obtained by treating the shaped fabric with an adjusted drying temperature.

[0008] Furthermore, the process of adjusting the initial draw ratio includes: Calculate the fiber density ratio of the carded sliver to the mixed fiber flow, and use it as the fiber density change rate; The fiber uniformity ratio of the carded sliver to the mixed fiber flow is calculated as the fiber uniformity change rate. Based on the comparison results of the fiber density change rate and density change threshold, and the comparison results of the fiber uniformity change rate and uniformity change threshold, the initial draw ratio is adjusted in a coordinated manner.

[0009] Furthermore, the process of coordinating the adjustment of the initial draw ratio includes: If the fiber density change rate is less than the lower limit of the density change threshold and the fiber uniformity change rate is less than the lower limit of the uniformity change threshold, a first adjustment command is generated to reduce the initial draw ratio. If the fiber density change rate is greater than the upper limit of the density change threshold and the fiber uniformity change rate is greater than the upper limit of the uniformity change threshold, a second adjustment command is generated to increase the initial draw ratio.

[0010] Furthermore, the process of coordinating the adjustment of the initial draw ratio also includes: If the fiber density change rate is equal to the density change threshold and the fiber uniformity change rate is less than the lower limit of the uniformity change threshold, or if the fiber uniformity change rate is equal to the uniformity change threshold and the fiber density change rate is less than the lower limit of the density change threshold, then a third adjustment command is generated to reduce the initial draw ratio and the reduction is less than the first adjustment command. If the fiber density change rate is equal to the density change threshold and the fiber uniformity change rate is greater than the upper limit of the uniformity change threshold, or if the fiber uniformity change rate is equal to the uniformity change threshold and the fiber density change rate is greater than the upper limit of the density change threshold, then a fourth adjustment command is generated to increase the initial draw ratio by a smaller amount than the second adjustment command.

[0011] Furthermore, the process of adjusting the initial weaving speed includes: The ratio of the yarn evenness variation coefficient to the preset yarn evenness variation coefficient is calculated as the first variation coefficient change rate. The ratio of the yarn evenness variation coefficient to the yarn evenness variation coefficient is calculated as the second variation coefficient rate. Based on the comparison results of the first coefficient of variation change rate and the first coefficient of variation change threshold, and the comparison results of the second coefficient of variation change rate and the second coefficient of variation change threshold, the initial weaving speed is adjusted in a coordinated manner.

[0012] Furthermore, the process of coordinating and adjusting the initial weaving speed also includes: If the first coefficient of variation change rate is less than the first coefficient of variation change threshold, and the second coefficient of variation change rate is less than the lower limit of the second coefficient of variation change threshold, a fifth adjustment command is generated to increase the initial weaving speed. If the first coefficient of variation rate is greater than the first coefficient of variation threshold, and the second coefficient of variation rate is greater than the upper limit of the second coefficient of variation threshold, a sixth adjustment command is generated to reduce the initial weaving speed.

[0013] Furthermore, the process of coordinating and adjusting the initial weaving speed also includes: If the first coefficient of variation change rate is greater than the first coefficient of variation change threshold, and the second coefficient of variation change rate is less than the lower limit of the second coefficient of variation change threshold, a seventh adjustment instruction is generated to reduce the initial weaving speed and the reduction is less than that of the sixth adjustment instruction. If the first coefficient of variation change rate is less than the first coefficient of variation change threshold, and the second coefficient of variation change rate is greater than the upper limit of the second coefficient of variation change threshold, then an eighth adjustment command is generated to increase the initial weaving speed by a smaller amount than the seventh adjustment command.

[0014] Furthermore, the process of adjusting the initial drying temperature includes: Calculate the ratio of the fabric shrinkage rate after setting to that before setting, and use it as the shrinkage change rate; The initial drying temperature is adjusted based on the comparison between the shrinkage rate and the shrinkage rate threshold.

[0015] Furthermore, the process of adjusting the initial drying temperature also includes: If the shrinkage rate is less than the rate of change threshold, a ninth adjustment command is generated to reduce the initial drying temperature. If the shrinkage rate is greater than the rate of change threshold, a tenth adjustment command is generated to increase the initial drying temperature.

[0016] Furthermore, the camel hair raw material is sequentially subjected to opening, impurity removal and mixing pretreatment to obtain the pretreated camel hair fiber; During the mixing process, a blending agent is continuously applied to form the mixed fiber stream; The camel hair raw material is camel hair that has been graded, washed and disinfected, and the auxiliary fiber is at least one of cashmere, wool or biodegradable chemical fiber, and the mass percentage of camel hair fiber in the mixed fiber stream is 60% to 70%.

[0017] Compared with existing technologies, the beneficial effects of the camel hair knitted fabric preparation method based on continuous process path of the present invention are as follows: the initial parameters of carding and drawing are determined based on the fiber density and uniformity of the mixed fiber flow; by detecting the quality of the carded sliver and calculating its fiber density change rate and fiber uniformity change rate relative to the mixed fiber flow, the initial draft ratio is adjusted, thus ensuring that the fibers entering the drawing process can be processed under the most suitable draft force regardless of the carding effect; the initial parameters of twisting and weaving are intelligently determined based on the coefficient of variation of yarn evenness, realizing the parameter connection from the spinning section to the weaving section. By detecting the coefficient of variation of evenness of yarn and yarn, and calculating the rate of change of the first and second coefficients of variation, the initial knitting speed is adjusted. This ensures that the yarn entering the knitting process is processed at the optimal knitting speed, maximizing both weaving efficiency and fabric appearance quality under complex conditions. The initial drying temperature is determined based on the fabric shrinkage rate before setting. The shrinkage rate is calculated using the fabric shrinkage rates before and after setting, and the initial drying temperature is then adjusted accordingly. This ensures that camel hair fibers are minimized from overheating or that compensatory setting is performed. This invention simultaneously optimizes production efficiency, quality stability, and fiber characteristic maintenance; providing a method for the large-scale and stable production of high-quality camel hair knitted fabrics.

[0018] Furthermore, in the spinning preparation stage, this invention determines a four-level synergistic adjustment strategy for the initial draft ratio based on the changes in fiber density and fiber evenness. Specifically, when insufficient carding is detected, a first adjustment command is generated to reduce the draft ratio, employing a protective process to prevent the deterioration of inferior sliver during drafting and ensuring the basic strength and evenness of the yarn. When excellent carding is detected, a second adjustment command is generated to increase the draft ratio, improving fiber straightness and production efficiency while ensuring quality. When an unbalanced state is detected, a third or fourth adjustment command is generated for minor adjustments, enabling targeted compensation for specific defects or utilization of local advantages. This setup ensures that the drafting process always operates within the optimal range, thereby significantly improving the final yarn evenness and fabric quality stability.

[0019] Furthermore, in the spinning and weaving stages, after adjusting the draft ratio process, this invention also determines a four-level coordinated adjustment strategy for the initial weaving speed based on the first and second coefficients of variation. Specifically, when the yarn is determined to be of high quality and the spinning process is optimized, a fifth adjustment instruction is generated to appropriately increase the weaving speed, maximizing efficiency while ensuring sufficient quality margin. When the yarn is determined to be substandard and the spinning process is deteriorating, a sixth adjustment instruction is generated to significantly reduce the weaving speed, absorbing inferior raw materials at the lowest speed and most stable state, ensuring the bottom-line quality of the fabric and preventing defective products. When complex states such as meeting the standards but the process is risky, or failing to meet the standards but the process is optimized, a seventh or eighth adjustment instruction is generated to perform a moderate or slight speed reduction, implementing preventative control.

[0020] Furthermore, in the post-processing and setting stage, after adjusting the weaving speed, the invention also adjusts the initial drying temperature based on the shrinkage rate before and after setting. Specifically, when the setting effect is deemed sufficient, a ninth adjustment command is generated to reduce the drying temperature. This ensures dimensional stability while preventing unnecessary heat damage to the camel hair fibers, effectively preserving their natural softness and warmth, and saving energy. When the setting effect is deemed insufficient, a tenth adjustment command is generated to increase the drying temperature. This compensatory process actively provides additional heat setting energy, ensuring that residual shrinkage potential is effectively eliminated during the drying stage, thereby guaranteeing the dimensional stability of the final fabric. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the process flow for preparing camel hair knitted fabric based on a continuous process path in an embodiment of the present invention; Figure 2 This is a schematic diagram of the modules used to implement the camel hair knitted fabric preparation method based on a continuous process path in an embodiment of the present invention; Figure 3 This is a logic diagram for adjusting heating power or stirring rate based on the comparison result of light transmittance and light transmittance threshold in an embodiment of the present invention. Figure 4 This is a logic diagram for adjusting the alkali addition rate or emulsion addition rate based on the comparison result between the first viscosity change rate and the first viscosity change threshold in an embodiment of the present invention. Figure 5 This is a logic diagram for adjusting the addition rate of the crosslinking agent based on the comparison result of the second viscosity change rate and the second viscosity change threshold in an embodiment of the present invention. Detailed Implementation

[0022] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0023] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0024] It should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] In this embodiment, by designing an integrated continuous process path, key processes are connected and controlled in an orderly manner, thereby reducing interference and damage in intermediate links, improving process stability and production efficiency, and better maintaining the natural and excellent characteristics of camel hair fibers, thus obtaining camel hair knitted fabrics with higher quality and better performance.

[0026] Please see Figure 1 The diagram shown is a schematic flow chart of a camel hair knitted fabric preparation method based on a continuous process path in an embodiment of the present invention. The method in this embodiment includes at least the following steps: S1: The pretreated camel hair fibers are mixed with auxiliary fibers to obtain a mixed fiber flow. The mixed fiber flow is detected to determine the corresponding mixed fiber density and mixed fiber uniformity. Based on the mixed fiber density and mixed fiber uniformity, the carding speed of the carding machine and the initial draft ratio of the drawing frame are determined. S2: Process the mixed fiber flow based on the carding speed to obtain a carded sliver, detect the carded sliver to determine the corresponding sliver fiber density and sliver fiber uniformity, and adjust the initial draw ratio based on the comparison between the sliver fiber density and the mixed fiber density, as well as the sliver fiber uniformity and the mixed fiber uniformity. S3: Based on the adjusted draft ratio, process the combed sliver to obtain the drawn sliver evenness, detect the drawn sliver evenness to determine the corresponding evenness variation coefficient, and determine the twisting speed of the twisting machine and the initial knitting speed of the knitting machine based on the evenness variation coefficient. S4: Based on the twisting speed, the yarn is processed and the yarn is evenly distributed to obtain yarn. The yarn is detected to determine the corresponding yarn evenness variation coefficient. The initial weaving speed is adjusted based on the comparison between the yarn evenness variation coefficient and the yarn evenness variation coefficient. S5: Process the yarn based on the adjusted weaving speed to obtain the fabric, detect the fabric to determine the corresponding fabric shrinkage rate, and determine the setting temperature in the setting process and the initial drying temperature in the drying process based on the fabric shrinkage rate. S6: Based on the shaping temperature, the fabric is treated and the treated fabric is detected to determine the corresponding fabric shrinkage rate, and the initial drying temperature is adjusted based on the change in the fabric shrinkage rate. S7: Based on the adjusted drying temperature, the shaped fabric is processed to obtain camel hair knitted fabric.

[0027] Please see Figure 2 The diagram shown is a schematic representation of the modules used to implement a continuous process path-based camel hair knitted fabric preparation method in an embodiment of the present invention. The modules in this embodiment include a preparation module, a data acquisition module, a process control module, and a process execution module.

[0028] The preparation module, serving as the physical execution carrier of the process, is connected in sequence to gradually transform fibers into camel hair knitted fabric. It includes a mixing and feeding unit, a carding and sliver forming unit, a drawing and drafting unit, a twisting and spinning unit, a knitting and weaving unit, a heat setting unit, and a drying and width setting unit. Specifically, the mixing and feeding unit performs step S1, receiving pre-treated camel hair fibers and auxiliary fibers from the fiber silo and mixing them using automatic weighing and opening equipment to form a continuous mixed fiber stream. The carding and sliver forming unit performs step S2, receiving the mixed fiber stream and using a carding machine to separate, remove impurities, and orient it, outputting a uniformly structured carded sliver. The drawing and drafting unit performs step S3, receiving the carded sliver and using a drawing frame to combine and draft it, improving the uniformity of long segments and outputting a drawn sliver evenness.

[0029] The spinning unit performs step S4, receiving the drawn yarn and twisting it using a spinning machine to form a yarn with a certain strength and elasticity. For example, strength refers to a single yarn breaking strength of 200-350 cN, and elasticity refers to an elastic recovery rate (at a constant elongation of 5%) greater than or equal to 90%. The knitting unit performs step S5, receiving the yarn and knitting it into a fabric using a knitting machine. The heat setting unit performs step S6, receiving the fabric and treating it under specific temperature and tension using a heat setting machine to obtain a dimensionally stable fabric. The drying and setting unit performs step S7, receiving the set fabric and treating it under controlled temperature using a dryer to finally obtain a finished camel hair knitted fabric that meets the requirements.

[0030] The data acquisition module connects to key nodes of each unit in the preparation module, responsible for acquiring physical signals reflecting the quality and process status of intermediate products in real time. This module includes: a fiber quality sensing unit, a sliver evenness detection unit, a yarn and evenness testing unit, and a fabric size detection unit. The fiber quality sensing unit performs the detection in step S1, specifically including a vibrating fiber fineness meter. It calculates the linear density of a single fiber by measuring its vibration frequency to determine fiber density, and combines this with multi-point sampling to statistically calculate the uniformity of fiber distribution to determine fiber evenness. The sliver evenness detection unit performs the detection in step S2, integrated between the carding machine and the drawing frame. It is typically a pneumatic or mechanical lever-type online detection mechanism. As the sliver passes through the detection rollers, continuous measurements are taken to determine the corresponding thickness or pressure changes, indirectly reflecting its weight per unit length, thereby determining the fiber density and fiber evenness of the carded sliver.

[0031] The evenness and yarn testing unit performs the tests in steps S3 and S4. The core equipment is a capacitive evenness tester (such as the Uster evenness tester). This unit passes the drawn evenness or yarn through a high-precision capacitive field, measuring the linear density variation by the change in capacitance, and directly outputting the coefficient of variation (CV) for evenness and the coefficient of variation for yarn evenness. The fabric size detection unit performs the tests in steps S5 and S6. Step S5 can use an offline standard shrinkage oven and length measuring instrument to standardize and measure the fabric sample, calculating the fabric shrinkage rate. Step S6 integrates a machine vision-based online length measuring system on the production line, capturing fabric markers with a camera and calculating the shrinkage rate of the fabric after shaping in real time.

[0032] The process control module is connected to the data acquisition module, receiving real-time data, performing calculations and judgments through a built-in algorithm model, and generating precise control commands. It includes an initial process parameter decision unit, a dynamic process parameter optimization unit, and a setting and drying parameter decision unit. The initial process parameter decision unit is used to determine the parameters in steps S1 and S3; based on the fiber density and uniformity input from the fiber quality sensing unit, it calls the process knowledge base model to calculate the carding speed of the carding machine and the initial draft ratio of the drawing frame; based on the evenness uniformity variation coefficient input from the evenness testing unit, it determines the twisting speed of the twisting machine and the initial knitting speed of the knitting machine.

[0033] The process knowledge base model constructs a three-dimensional lookup table model, taking the mixed fiber density (unit: g / cm³) and mixed fiber uniformity (unit: %) as inputs, and outputting the carding machine main motor frequency (Hz) and the initial draft ratio of the drawing frame. Under laboratory conditions, camel hair and auxiliary fibers (at a mass ratio of 65:35) were mixed, and standard mixed fiber flow samples with different mixed fiber densities (0.08–0.18 g / cm³, step size 0.01) and mixed fiber uniformities (8%–18%, step size 1%) were prepared by adjusting the opening and feeding processes. For each group (mixed fiber density, mixed fiber uniformity), with the fiber density change rate Y ∈ density change threshold Y0 and the uniformity change rate U ∈ uniformity change threshold U0 after carding as the objective, the carding machine frequency and draft ratio were optimized using the golden section search method. For example, when the mixed fiber density is 0.35 g / cm³ and the mixed fiber uniformity is 92%, the initial carding speed is 45 m / min and the initial draw ratio is 6.2 times.

[0034] The dynamic process parameter optimization unit executes the parameter adjustments in steps S2, S4, and S6; based on the sliver fiber density and uniformity change signals fed back by the sliver evenness detection unit, it compares them with the initial target to determine the adjustment command for the draft ratio; based on the yarn evenness variation coefficient and evenness uniformity variation coefficient fed back by the yarn and yarn evenness testing units respectively, it performs dynamic comparative analysis to determine the command for adjusting the initial knitting speed of the knitting machine; based on the fabric shrinkage rate change after setting fed back by the fabric size detection unit, it compares it with the fabric shrinkage rate before setting to determine the command for adjusting the initial drying temperature of the dryer. The setting and drying parameter decision unit executes the parameter determination in step S5; based on the offline measured fabric shrinkage rate and combined with the camel hair fiber thermal performance model, it calculates the setting temperature and the initial drying temperature of the dryer required to achieve dimensional stability.

[0035] The camel hair fiber thermal performance model establishes regression equations between fabric heat shrinkage rate and setting temperature (°C), setting time, drying temperature (°C), and drying time (s). Three typical fabrics with camel hair content of 60%, 65%, and 70% were selected for full-factor experiments under the following conditions: setting temperatures of 140°C, 150°C, and 160°C (in 10°C increments), setting times of 30s, 45s, and 60s, drying temperatures of 100°C, 120°C, and 140°C, and drying times of 60s, 90s, and 120s. The heat shrinkage rate of each sample was tested according to GB / T 8628-2001. The least squares method was used to fit the regression equations, and then the setting temperature and initial drying temperature of the dryer required to achieve dimensional stability were output based on the regression equations. For example, when the target shrinkage rate is 3%, the setting time is 40s, and the drying time is 80s, the setting temperature and initial drying temperature required for dimensional stability are 152°C and 118°C, respectively.

[0036] The process execution module is connected to both the process control module and the preparation module, and includes a carding and drafting execution unit, a spinning and knitting execution unit, and a setting and drying execution unit. The carding and drafting execution unit, based on instructions from the initial process parameter decision unit or the dynamic process parameter optimization unit, precisely adjusts the speed of the carding machine's main motor via a frequency converter, and drives the speed of the drawing frame's drafting rollers via a servo system, thereby adjusting the initial draft ratio. The spinning and knitting execution unit, based on instructions from the initial process parameter decision unit, sets the speed of the twisting machine's spindle motor via a servo driver; and based on instructions from the dynamic process parameter optimization unit, adjusts the speed of the knitting machine's main drive motor in real time via a frequency converter, thereby adjusting the initial knitting speed.

[0037] The setting and drying execution unit sets the temperature of the hot air circulation system or hot roller of the setting machine through the temperature controller according to the instructions of the setting and drying parameter decision unit, thereby setting the setting temperature during the setting process; according to the instructions of the dynamic process parameter optimization unit, it dynamically adjusts the power of the heaters in each temperature zone of the dryer or the opening of the steam inlet valve through the proportional-integral-derivative controller or electric regulating valve, thereby adjusting the initial drying temperature during the drying process.

[0038] It should be noted that the basic data for constructing the built-in algorithm model using the feedback control principle, the process knowledge base model based on common industry knowledge, and the model for constructing the thermal performance of camel hair fibers by conducting systematic thermodynamic tests on several camel hair fabrics with different mixing ratios and using the least squares algorithm for regression analysis are all existing technologies and will not be elaborated here.

[0039] Specifically, when adjusting the initial draft ratio based on changes in fiber density and fiber uniformity, the mixed fiber density and uniformity corresponding to the detection of the mixed fiber flow are obtained, as well as the sliver fiber density and uniformity corresponding to the detection of the carded sliver. Further, the ratio of the carded sliver fiber density to the mixed fiber density is calculated to obtain the fiber density change rate Y, and the ratio of the carded sliver fiber uniformity to the mixed fiber uniformity is calculated to obtain the fiber uniformity change rate U. The fiber density change rate Y characterizes the change in the structural compactness of the fiber assembly after carding, reflecting the change in the number of fibers per unit volume when the loosely mixed fiber flow is transformed into an ordered, parallel-arranged carded sliver after carding. The fiber uniformity change rate U characterizes the degree of improvement in the uniformity of fiber distribution after carding, reflecting the degree to which the uniformity of fiber distribution in the fiber assembly along its length or cross-section is improved after the carding process.

[0040] In one specific embodiment, a density change threshold Y0 and a uniformity change threshold U0 are set, and the fiber density change rate Y and the density change threshold Y0 are compared, and the fiber uniformity change rate U and the uniformity change threshold U0 are compared, and then the initial draw ratio for coordinated adjustment is determined based on the comparison results.

[0041] The determination of the density change threshold Y0 and the uniformity change threshold U0 is based on the statistical correlation of historical production data. Specifically, under stable process parameters in upstream processes such as the carding machine and the blending and feeding unit, historical production batch data are collected. Batches whose carded sliver quality meets the standards and ultimately produces qualified camel hair knitted fabric are selected. The measured data of fiber density change rate Y and fiber uniformity change rate U corresponding to these batches are extracted to form qualified density change rate sample sets and uniformity change rate sample sets, respectively. The range of values ​​obtained by calculating the 5th to 95th percentiles of the density change rate sample sets is established as the value range of the density change threshold Y0; similarly, the range of values ​​obtained by calculating the 5th to 95th percentiles of the uniformity change rate sample sets is established as the value range of the uniformity change threshold U0. For example, Y0 = [1.08, 1.15] and U0 = [1.05, 1.10].

[0042] The comparison process based on the fiber density change rate Y and Y0, and based on the fiber uniformity change rate U and U0, is as follows: If Y is less than Y0min (i.e., Y < 1.08) and U is less than U0min (i.e., U < 1.05), it indicates severe under-carding. This can be compensated for by reducing the initial draft ratio to prevent further deterioration of the yarn evenness. Therefore, the process control module generates a first adjustment command, and the process execution module reduces the initial draft ratio based on the first adjustment command, thereby reducing the drafting force and allowing the fibers to be straightened in a more gentle and controlled manner. For example, if the initial draft ratio of the drawing frame is set to 6.5 times and Y = 1.05 and U = 1.04 based on the fiber density and fiber evenness of the mixed fiber flow, then the initial draft ratio is reduced to 5.5 times based on the first adjustment command. It should be noted that the reduction in the draft ratio is within the allowable range of the drawing frame's performance, and reducing the draft ratio does not negatively affect the evenness of the drawn frame; and the reduction in the draft ratio decreases as the value of the fiber evenness change rate U decreases.

[0043] If Y is greater than Y0max (i.e., Y > 1.15) and U is greater than U0max (i.e., U > 1.10), it indicates excellent combing effect. The draft ratio can be increased to further improve fiber straightness and parallelism. Therefore, the process control module generates a second adjustment command, and the process execution module increases the initial draft ratio based on the second adjustment command, increasing the machine speed (increasing the draft ratio usually means faster output speed) while ensuring quality, thus improving production efficiency. For example, if the initial draft ratio of the drawing frame is set to 7.0 times and Y = 1.17 and U = 1.13, then the initial draft ratio is increased to 8.0 times based on the second adjustment command. It should be noted that the increase in the draft ratio is within the allowable range of the drawing frame's performance, and increasing the draft ratio will not negatively affect the evenness of the drawing frame; and the increase in the draft ratio increases with the increase in the fiber evenness change rate U.

[0044] If Y∈Y0 (i.e., Y∈[1.08, 1.15]) and U<U0min (i.e., U<1.05), the fibers are compressed sufficiently, but internally disordered; or if U∈U0 (i.e., U∈[1.05, 1.10]) and Y<Y0min (i.e., Y<1.08), the fibers are separated but not tightly packed. Both cases indicate uneven carding effect. Therefore, the process control module generates a third adjustment instruction, and the process execution module reduces the initial draft ratio based on the third adjustment instruction, thereby improving the drafting control of disordered fibers and adapting to the drafting characteristics of fluffy fibers. In this case, the carded sliver is not completely deteriorated, but has a single defect. Therefore, the reduction in the initial draft ratio determined by the third adjustment instruction is less than the reduction determined by the first adjustment instruction to compensate for the deficiency. For example, if the initial draft ratio of the drawing frame is set to 6.5 times and U=1.02, the initial draft ratio is reduced to 6.0 times based on the third adjustment instruction.

[0045] If Y∈Y0 (i.e., Y∈[1.08, 1.15]) and U is greater than U0max (i.e., U>1.10), it indicates that the density just meets the standard, but the uniformity is very good; or U∈U0 (i.e., U∈[1.05, 1.10]) and Y is greater than Y0max (i.e., Y>1.15), it indicates that the uniformity just meets the standard, but the fibers are very dense. Therefore, the process control module generates a fourth adjustment command, and the process execution module increases the initial draft ratio based on the fourth adjustment command. The increase in the initial draft ratio determined by the fourth adjustment command is less than the increase determined by the second adjustment. By slightly increasing the draft ratio, the fabric quality or production efficiency can be further improved. For example, if the initial draft ratio of the drawing frame is set to 7.0 times and U=1.12, the initial draft ratio is increased to 7.5 times based on the fourth adjustment command.

[0046] If Y∈Y0 (i.e., Y∈[1.08, 1.15]) and U∈U0 (i.e., U∈[1.05, 1.10]), then the preparation module is determined to continue production preparation based on the original initial draw ratio.

[0047] Specifically, when adjusting the initial weaving speed based on the comparison between the yarn evenness coefficient of variation and the evenness coefficient of variation, the evenness coefficient of variation corresponding to the detection of the drawn evenness and the evenness coefficient of variation corresponding to the detection of the yarn are obtained. Further, a preset yarn evenness coefficient of variation is set, and the ratio of the yarn evenness coefficient of variation to the preset yarn evenness coefficient of variation is calculated and denoted as the first coefficient of variation change rate K. The ratio of the yarn evenness coefficient of variation to the evenness coefficient of variation is calculated and denoted as the second coefficient of variation change rate L. The value of the first coefficient of variation change rate K reflects the deviation between the current yarn quality and the preset standard quality; the value of the second coefficient of variation change rate L reflects the change in the current yarn quality relative to the evenness quality of the drawn evenness before twisting.

[0048] In one specific embodiment, a first coefficient of variation change threshold K0 is set based on the quality requirements of the target camel hair knitted fabric, and a second coefficient of variation change threshold L0 is set based on the processing fluctuation range of the spinning equipment and process under normal conditions. The first coefficient of variation change rate K is compared with the first coefficient of variation change threshold K0, and the second coefficient of variation change rate L is compared with the second coefficient of variation change threshold L0. Based on the comparison results, the initial knitting speed of the knitting machine is adjusted collaboratively.

[0049] The determination of the first coefficient of variation threshold K0 and the second coefficient of variation threshold L0 is based on the statistical correlation of historical production data. Specifically, under stable process parameters for drawing, twisting, and subsequent processes, historical production batch data are collected. Batches whose spun yarn quality meets standards and ultimately produces qualified camel hair knitted fabric are selected. The measured data of the first coefficient of variation rate K and the second coefficient of variation rate L corresponding to these batches are extracted, forming qualified sample sets of the first and second coefficients of variation rates, respectively. The median or a specific quantile (e.g., the 50th percentile) of the first coefficient of variation rate sample set is calculated, and the resulting statistical value is established as the first coefficient of variation threshold K0, serving as a benchmark for assessing whether the current yarn quality has reached the historical normal level. Simultaneously, the range from the 5th to the 95th percentile of the second coefficient of variation rate sample set is calculated, establishing the range of values ​​for the second coefficient of variation threshold L0, thereby defining the reasonable fluctuation range of the twisting process's impact on fiber sliver uniformity under normal process conditions. For example, K0 is set to 1.0 and L0 to [1.05, 1.15].

[0050] The process of comparing the first rate of change of the coefficient of variation K with the first threshold K0 of the coefficient of variation and the second rate of change of the coefficient of variation L with the second threshold L0 of the coefficient of variation is as follows: If K is less than 1.0 and L is less than L0min (i.e., L < 1.05), it indicates that the actual yarn uniformity is better than the preset quality baseline, and that the yarn uniformity is better than the evenness, indicating the best yarn condition. Therefore, the process control module generates a fifth adjustment command, and the process execution module increases the initial knitting speed based on the fifth adjustment command, thereby pursuing higher production efficiency while ensuring fabric quality, achieving quality improvement and efficiency enhancement. For example, if the initial knitting speed of the knitting machine is set to 1.0 m / s based on the coefficient of variation of evenness, and K = 0.98 and L = 1.03, then the initial knitting speed is increased to 1.15 m / s based on the fifth adjustment command. It should be noted that the increase in knitting speed is within the safe operating range of the knitting machine and will not have a negative impact on the fabric.

[0051] If K is greater than 1.0 and L is greater than L0max (i.e., L > 1.15), it indicates that the actual yarn evenness is worse than the preset requirement, reaching or exceeding the quality red line. Simultaneously, it indicates that the yarn evenness is worse than the yarn evenness, representing the most severe process anomaly. Therefore, the process control module generates a sixth adjustment command, and the process execution module reduces the initial knitting speed based on this command to knit the inferior raw material at the lowest and most stable speed, preventing equipment damage and striving to ensure the bottom quality of the fabric. For example, if the initial knitting speed is set to 1.0 m / s, the initial knitting speed is reduced to 0.75 m / s based on the sixth adjustment command, with K = 1.03 and L = 1.18. It should be noted that the reduction in knitting speed is within the safe operating range of the knitting machine and will not negatively impact the fabric.

[0052] If K is greater than 1.0 and L is less than L0min (i.e., L < 1.05), it indicates that although the yarn uniformity has improved, the quality of the yarn after twisting by the twisting machine does not meet the preset standard. In this case, a conservative strategy is still required. Therefore, the process control module generates a seventh adjustment command, and the process execution module reduces the initial weaving speed based on the seventh adjustment command. A small speed reduction is made to reserve a safety margin and prevent defective yarn from being woven into defective fabric due to excessive speed. Therefore, the reduction in the initial weaving speed determined by the seventh adjustment command is less than the reduction determined by the sixth adjustment. For example, if the initial weaving speed is set to 1.0 m / s, and K = 1.03 and L = 1.02, then the initial weaving speed is reduced to 0.85 m / s based on the seventh adjustment command.

[0053] If K is less than 1.0 and L is greater than L0max (i.e., L > 1.15), it indicates that although the yarn quality meets the preset standard, the uniformity after twisting by the twisting machine is relatively worse, and the subsequent yarn quality may fall below the qualified line at any time. In this case, a conservative strategy should be adopted. Therefore, the process control module generates an eighth adjustment command, and the process execution module reduces the initial knitting speed based on the eighth adjustment command. The reduction in the initial knitting speed determined by the eighth adjustment command is less than the reduction determined by the seventh adjustment command. For example, if the initial knitting speed is set to 1.0 m / s, and K = 0.99 and L = 1.17, then the initial knitting speed is reduced to 0.90 m / s based on the eighth adjustment command.

[0054] If K equals 1.0 and L∈L0 (i.e., L∈[1.05, 1.15]), then the preparation module is determined to continue production based on the original initial weaving speed.

[0055] Specifically, when adjusting the initial drying temperature based on the change in fabric shrinkage, the fabric shrinkage rate before and after the setting treatment is obtained. Further, the ratio of the fabric shrinkage rate after setting to the fabric shrinkage rate before setting is calculated and denoted as the shrinkage change rate G. The magnitude of the shrinkage change rate G reflects the residual shrinkage potential of the fabric after setting. A smaller shrinkage change rate G indicates a better setting effect and more stable fabric dimensions.

[0056] In one specific embodiment, a change rate threshold G0 is set and compared with the shrinkage change rate G. Based on the comparison result, the degree of fabric size stability after the shaping process is determined, and then the adjustment method of the initial drying temperature is determined.

[0057] The determination of the rate of change threshold G0 is based on statistical correlation of historical production data. Specifically, under stable heat setting and preceding process parameters, historical production batch data are collected, batches of finished camel hair knitted fabrics that meet dimensional stability standards are selected, and the measured shrinkage rate G corresponding to these batches is extracted to form a qualified sample set. The median or a specific quantile (such as the 50th percentile) of this qualified sample set is calculated, and the resulting statistical value is established as the rate of change threshold G0. For example, the rate of change threshold G0 is set to 0.5.

[0058] The comparison is based on the shrinkage rate of change G and the rate of change threshold G0, and the process is as follows: If G is less than G0, it indicates that the fabric's shrinkage potential has been fully eliminated by the heat setting process, and the dimensions are highly stable. The main task of the subsequent drying stage is to remove moisture, rather than further heat setting. Therefore, the process control module generates a ninth adjustment command, and the process execution module reduces the initial drying temperature based on the ninth adjustment command, thereby saving energy and avoiding unnecessary heat effects on the camel hair fibers. For example, if the initial drying temperature is set to 120°C and G=0.4 based on the fabric shrinkage rate, the initial drying temperature will be reduced to 110°C based on the ninth adjustment command. It should be noted that the reduction in drying temperature increases as the value of G decreases, and the reduced drying temperature will not have a negative impact on the fabric.

[0059] If G is greater than G0, it indicates insufficient heat setting and a large residual shrinkage potential in the fabric. Therefore, the process control module generates a tenth adjustment command, and the process execution module increases the initial drying temperature during the drying stage based on this command, thereby providing additional heat setting energy. For example, if the initial drying temperature is set to 120°C and G = 0.65, the initial drying temperature is increased to 135°C based on the tenth adjustment command. It should be noted that the increase in drying temperature increases with the value of G, and the increased drying temperature does not negatively impact the fabric.

[0060] If G equals G0, then the preparation module is determined to continue production based on the original initial drying temperature.

[0061] In this embodiment, the camel hair raw material, after grading, washing, and disinfection, is fed into a continuous pretreatment production line consisting of an automatic wool feeder, a porcupine-style opening machine, a multi-bin cotton blending machine, and a dust removal system. The pretreatment process is carried out in a constant temperature and humidity workshop with an ambient temperature of 22±2℃ and a relative humidity of 65±5%, thereby obtaining pretreated camel hair fibers.

[0062] Pretreated camel hair fibers are piped to a metered oiling mixer, where they are finally mixed with auxiliary fibers and the wool-refining oil is applied. The wool-refining oil is applied using a composite antistatic wool-refining oil specifically designed for animal fibers, primarily composed of smoothing agents, antistatic agents, and emulsifiers. This oil is applied at a metered rate of 1.0%–1.8% of the total raw material weight. The spraying system uses a dual-fluid atomizing nozzle to create a uniform oil mist within the mixer, ensuring the oil evenly coats the fiber surface with particles of 20–40 μm. The purpose of applying the oil is to effectively reduce the coefficient of friction and electrostatic effects of the fibers during subsequent carding processes, minimizing fiber damage and flyaways.

[0063] The auxiliary fibers are selected from at least one of the following: cashmere with an average fineness ≤16.5μm, wool with an average length ≥60mm, or biodegradable chemical fibers with a diameter of 1.2D×38mm. During mixing, the feeding ratio is precisely controlled by a weighing-type batching system to ensure that the mass proportion of camel hair fibers in the final continuous mixed fiber stream is strictly controlled between 60% and 70%.

[0064] To better illustrate the preparation process of camel hair knitted fabric, the present invention will be further described below with reference to specific embodiments. Example 1:

[0065] Step 1: In the pretreatment, the mass ratio of camel hair fiber is controlled to be 60%, and the hair oil agent is sprayed quantitatively at 1.0% of the total weight of raw materials.

[0066] Step 2: Based on the fiber density and fiber uniformity of the mixed fiber flow, the initial draft ratio of the drawing frame is determined to be 6.5 times; the fiber density change rate Y = 1.05 and the fiber uniformity change rate U = 1.04 are calculated.

[0067] Step 3: Generate the first adjustment command and reduce the initial stretch ratio to 5.5 times.

[0068] Step 4: Determine the initial knitting speed of the knitting machine as 1.0 m / s based on the coefficient of variation of yarn evenness; calculate the first coefficient of variation change rate K=1.03 and the second coefficient of variation change rate L=1.02.

[0069] Step 5: Generate the seventh adjustment command and reduce the initial weaving speed to 0.85 m / s.

[0070] Step 6: Based on the fabric shrinkage rate, the initial drying temperature during the drying process is determined to be 120℃; the shrinkage change rate G is calculated to be 0.4.

[0071] Step 7: Generate the ninth adjustment command and reduce the initial drying temperature to 110°C.

[0072] Step 8: Finally, the preparation of the camel hair knitted fabric is completed. Example 2:

[0073] Step 1: In the pretreatment, the mass ratio of camel hair fiber is controlled to be 70%; and the hair oil agent is sprayed quantitatively at 1.8% of the total weight of the raw materials.

[0074] Step 2: Based on the fiber density and fiber uniformity of the mixed fiber flow, the initial draft ratio of the drawing frame is determined to be 7.0 times; the fiber density change rate Y = 1.17 and the fiber uniformity change rate U = 1.13 are calculated.

[0075] Step 3: Generate a second adjustment command and increase the initial stretch ratio to 8.0 times.

[0076] Step 4: Determine the initial knitting speed of the knitting machine as 1.0 m / s based on the coefficient of variation of yarn evenness; calculate the first coefficient of variation change rate K=1.03 and the second coefficient of variation change rate L=1.18.

[0077] Step 5: Generate the sixth adjustment command and reduce the initial weaving speed to 0.75 m / s.

[0078] Step 6: Determine the initial drying temperature during the drying process to be 120℃ based on the fabric shrinkage rate; calculate the shrinkage change rate G=0.5.

[0079] Step 7: Dry at an initial drying temperature of 120℃.

[0080] Step 8: Finally, the preparation of the camel hair knitted fabric is completed. Example 3:

[0081] Step 1: In the pretreatment, the mass ratio of camel hair fiber is controlled to be 65%; and the hair oil agent is sprayed quantitatively at 1.4% of the total weight of the raw materials.

[0082] Step 2: Based on the fiber density and fiber uniformity of the mixed fiber flow, the initial draft ratio of the drawing frame is determined to be 7.0 times; the fiber density change rate Y = 1.15 and the fiber uniformity change rate U = 1.10 are calculated.

[0083] Step 3: Draw the strips according to the initial draw ratio of 7.0.

[0084] Step 4: Determine the initial knitting speed of the knitting machine as 1.0 m / s based on the coefficient of variation of yarn evenness; calculate the first coefficient of variation change rate K=0.99 and the second coefficient of variation change rate L=1.17.

[0085] Step 5: Generate the eighth adjustment command and reduce the initial weaving speed to 0.90 m / s.

[0086] Step 6: Based on the fabric shrinkage rate, the initial drying temperature during the drying process is determined to be 120℃; the shrinkage change rate G is calculated to be 0.65.

[0087] Step 7: Generate the tenth adjustment command and increase the initial drying temperature to 135°C.

[0088] Step 8: Finally, the preparation of the camel hair knitted fabric is completed.

[0089] Comparative Example 4: The difference between this example and Example 1 is that, after calculating the fiber density change rate Y=1.05 and the fiber uniformity change rate U=1.04, the sliver is drawn at the original initial draw ratio of 6.5; and after calculating the shrinkage change rate G=0.4, the sliver is dried at the original initial drying temperature of 120°C. The rest is the same as Example 1.

[0090] Comparative Example 5: The difference between this and Example 2 is that, after calculating the first coefficient of variation change rate K=1.03 and the second coefficient of variation change rate L=1.02, the weaving is performed at the original weaving speed of 1.0 m / s. Everything else is the same as in Example 2.

[0091] Comparative Example 6: The difference between this and Example 3 is that, after calculating the shrinkage rate G=0.65, the drying was carried out at the original initial drying temperature of 120°C. Everything else is the same as in Example 3.

[0092] All embodiments and comparative examples shall meet the following constraints: Raw material consistency: Camel hair fibers from the same batch, origin, and storage conditions are used, and are packaged and sealed for storage. Equal amounts are taken before each experiment.

[0093] Equipment uniformity: The process is carried out on the same carding machine, drawing frame, twisting machine, knitting machine, setting machine, and dryer, and the equipment parameters (except for the adjustable quantities) remain fixed.

[0094] Environmental control: All experiments were conducted in a constant temperature and humidity chamber (temperature 22±1℃, relative humidity 65±3%), and the actual values ​​were recorded.

[0095] Randomization of time sequence: To avoid the effects of equipment drift, the experimental order of the examples and control examples should be randomized (e.g., using a Latin square design).

[0096] Number of repetitions: Each condition should be repeated at least 3 times, and the average value should be taken as the final result.

[0097] The camel hair knitted fabrics prepared according to Examples 1 to 6 were subjected to performance tests according to national standard methods, as follows: Heat shrinkage rate (%): Using a fabric shrinkage tester, standard washing and drying equipment, and a steel ruler, at least three 50cm × 50cm samples were cut from each fabric sample according to GB / T8628-2001 and marked as specified in the standard. The samples were washed using a standard washing program (40℃ water temperature, normal agitation) and then dried (hanging to dry or tumble drying, depending on product requirements), followed by conditioned under standard temperature and humidity conditions. The distance between the marked points before and after washing and drying was measured, and the average value of the warp and weft dimensional change rate was calculated as the heat shrinkage rate of the sample.

[0098] Breaking stress (N) (warp / weft): Using an electronic fabric tensile testing machine, according to GB / T 3923.1-2013, at least five samples each with a width of (50±0.5) mm and a length sufficient for clamping were cut along the warp and weft directions of the fabric. After conditioning under standard temperature and humidity conditions, the samples were clamped on the tensile testing machine and tested at the specified tensile speed. The maximum force (N) that the samples could withstand at break was recorded. The average values ​​of the breaking stress in the warp and weft directions were calculated separately.

[0099] Pilling Grade (Level): Using a Martindale pilling tester or a circular trajectory pilling tester, according to GB / T 4802.1-2008, a sample of specified size is cut from the fabric sample, mounted on the pilling tester, and rubbed against a standard abrasive under specified pressure for a certain number of cycles. After the test, under specified lighting conditions, the sample is compared with a standard sample to evaluate its pilling grade. The higher the grade, the better the anti-pilling performance.

[0100] Evenness CV value (%): Using a yarn evenness tester, according to GB / T 3292.1-2008, representative yarns are taken from the corresponding yarns of the fabric or directly from the fabric, conditioned under standard temperature and humidity conditions, and then the evenness tester is used to test the linear density unevenness of the yarns at a certain speed and length. The instrument automatically calculates and outputs the coefficient of variation (CV%) for evenness. The lower the value, the more even the yarn evenness.

[0101] Appearance Defect Scoring: Using a fabric inspection table, standard light source, and steel ruler, according to FZ / T 73009-2021, the entire fabric sample is laid flat on the inspection table. Under the specified illumination and viewing angle, the inspector examines both sides of the fabric. Based on the scoring regulations in the standard for the size, length, and quantity of various defects (such as rough spots, holes, oil stains, color differences, etc.), the total defect score for the fabric is calculated. The lower the score, the better the appearance quality.

[0102] Dimensional stability evaluation: Based on the test results of the heat shrinkage rate mentioned above, and referring to the comprehensive requirements of the company's internal control standards regarding dimensional change rate after washing or steaming, appearance flatness, and tortuosity changes, an evaluation is conducted. Dimensional stability is usually classified into grades such as "superior," "first-class," "qualified," and "unqualified."

[0103] The specific data is shown in Table 1: ; Results analysis: As can be seen from the comparison of the above embodiments, the complete implementation of embodiments one, two and three of the present invention is significantly better than the control embodiments four, five and six without corresponding adjustments in terms of key performance indicators.

[0104] Effectiveness of spinning segment control (comparative example 1 and control example 4): When the combing effect is insufficient (low Y and U), example 1 effectively reduced fiber damage by reducing the draft ratio, resulting in a significant improvement in both breaking strength and anti-pilling properties of the fabric. This demonstrates the key role of this control strategy in protecting fibers and improving the mechanical and surface properties of the fabric.

[0105] Effectiveness of weaving segment control (comparative Example 2 and Control Example 5): When yarn evenness deteriorates significantly (L value is too high), Example 2, by drastically reducing the weaving speed, gave the system more time to process uneven yarn, thereby significantly reducing fabric appearance defects and achieving better yarn evenness. Control Example 5, due to the lack of speed reduction, resulted in more defects, demonstrating that actively reducing speed when yarn condition is poor is a necessary measure to ensure the final fabric appearance quality.

[0106] Post-processing stage control precision (comparative Example 3 and Control Example 6): When the setting effect was substandard (G value too high), Example 3 compensated for the setting by increasing the drying temperature, successfully controlling the heat shrinkage rate within the acceptable range. In contrast, Control Example 6 used a fixed process, resulting in severely unacceptable dimensions. This demonstrates that feedback adjustment based on the G value can accurately compensate for deviations in previous processes, ensuring the dimensional stability of the final product.

[0107] in conclusion: This invention provides a complete closed-loop intelligent control system by real-time calculation of key process parameters such as fiber density change rate Y, fiber uniformity change rate U, first coefficient of variation change rate K, second coefficient of variation change rate L, and shrinkage change rate G, and dynamically adjusting the stretching, weaving, and drying processes accordingly. The preparation method in this embodiment can precisely intervene in the equipment parameters of subsequent processes based on the product performance parameters prepared in the previous process, effectively solving the industry problem that traditional fixed processes cannot adapt to raw material fluctuations and cannot simultaneously achieve multiple performance targets. Ultimately, it simultaneously improves the overall quality and production stability of camel hair knitted fabrics in terms of dimensional stability, mechanical properties, surface quality, and production efficiency.

[0108] All technologies not mentioned in the above embodiments are applicable to existing technologies. It is understood that no specific limitation is made to any preset parameter or critical parameter in the embodiments of the present invention, and the above values ​​are not limited thereto. Those skilled in the art can adjust the preset parameters or critical parameters accordingly based on actual needs, analysis of historical data, or equipment usage.

[0109] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A method for preparing camel hair knitted fabric based on a continuous process path, characterized in that, include: The pretreated camel hair fibers are mixed with auxiliary fibers to obtain a mixed fiber flow. The mixed fiber flow is detected to determine the corresponding mixed fiber density and mixed fiber uniformity. Based on the mixed fiber density and mixed fiber uniformity, the carding speed of the carding machine and the initial draft ratio of the drawing frame are determined. The mixed fiber flow is processed based on the carding speed to obtain a carded sliver. The carded sliver is detected to determine the corresponding sliver fiber density and sliver fiber uniformity. The initial draw ratio is adjusted based on the comparison between the sliver fiber density and the mixed fiber density, as well as the sliver fiber uniformity and the mixed fiber uniformity. The carded sliver is processed based on the adjusted draft ratio to obtain a drawn sliver evenness. The drawn sliver evenness is detected to determine the corresponding evenness variation coefficient. Based on the evenness variation coefficient, the twisting speed of the twisting machine and the initial knitting speed of the knitting machine are determined. The yarn is obtained by processing the sliver evenness based on the twisting speed, the yarn is detected to determine the corresponding yarn evenness variation coefficient, and the initial weaving speed is adjusted based on the comparison between the yarn evenness variation coefficient and the evenness variation coefficient. The yarn is processed based on the adjusted weaving speed to obtain fabric, the fabric is detected to determine the corresponding fabric shrinkage rate, and the setting temperature during the setting process and the initial drying temperature during the drying process are determined based on the fabric shrinkage rate. The fabric is treated based on the setting temperature, and the treated fabric is detected to determine the corresponding fabric shrinkage rate. The initial drying temperature is then adjusted based on the change in the fabric shrinkage rate. Camel hair knitted fabric is obtained by treating the shaped fabric with an adjusted drying temperature.

2. The method for preparing camel hair knitted fabric based on a continuous process path according to claim 1, characterized in that, The process of adjusting the initial draw ratio includes: Calculate the fiber density ratio of the carded sliver to the mixed fiber flow, and use it as the fiber density change rate; The fiber uniformity ratio of the carded sliver to the mixed fiber flow is calculated as the fiber uniformity change rate. Based on the comparison results of the fiber density change rate and density change threshold, and the comparison results of the fiber uniformity change rate and uniformity change threshold, the initial draw ratio is adjusted in a coordinated manner.

3. The method for preparing camel hair knitted fabric based on a continuous process path according to claim 2, characterized in that, The process of coordinating the adjustment of the initial draw ratio includes: If the fiber density change rate is less than the lower limit of the density change threshold and the fiber uniformity change rate is less than the lower limit of the uniformity change threshold, a first adjustment command is generated to reduce the initial draw ratio. If the fiber density change rate is greater than the upper limit of the density change threshold and the fiber uniformity change rate is greater than the upper limit of the uniformity change threshold, a second adjustment command is generated to increase the initial draw ratio.

4. The method for preparing camel hair knitted fabric based on a continuous process path according to claim 3, characterized in that, The process of coordinating the adjustment of the initial draw ratio also includes: If the fiber density change rate is equal to the density change threshold and the fiber uniformity change rate is less than the lower limit of the uniformity change threshold, or if the fiber uniformity change rate is equal to the uniformity change threshold and the fiber density change rate is less than the lower limit of the density change threshold, then a third adjustment command is generated to reduce the initial draw ratio and the reduction is less than the first adjustment command. If the fiber density change rate is equal to the density change threshold and the fiber uniformity change rate is greater than the upper limit of the uniformity change threshold, or if the fiber uniformity change rate is equal to the uniformity change threshold and the fiber density change rate is greater than the upper limit of the density change threshold, then a fourth adjustment command is generated to increase the initial draw ratio by a smaller amount than the second adjustment command.

5. The method for preparing camel hair knitted fabric based on a continuous process path according to claim 2, characterized in that, The process of adjusting the initial knitting speed includes: The ratio of the yarn evenness variation coefficient to the preset yarn evenness variation coefficient is calculated as the first variation coefficient change rate. The ratio of the yarn evenness variation coefficient to the yarn evenness variation coefficient is calculated as the second variation coefficient rate. Based on the comparison results of the first coefficient of variation change rate and the first coefficient of variation change threshold, and the comparison results of the second coefficient of variation change rate and the second coefficient of variation change threshold, the initial weaving speed is adjusted in a coordinated manner.

6. The method for preparing camel hair knitted fabric based on a continuous process path according to claim 5, characterized in that, The process of coordinating the adjustment of the initial weaving speed also includes: If the first coefficient of variation change rate is less than the first coefficient of variation change threshold, and the second coefficient of variation change rate is less than the lower limit of the second coefficient of variation change threshold, a fifth adjustment command is generated to increase the initial weaving speed. If the first coefficient of variation rate is greater than the first coefficient of variation threshold, and the second coefficient of variation rate is greater than the upper limit of the second coefficient of variation threshold, a sixth adjustment command is generated to reduce the initial weaving speed.

7. The method for preparing camel hair knitted fabric based on a continuous process path according to claim 6, characterized in that, The process of coordinating the adjustment of the initial weaving speed also includes: If the first coefficient of variation change rate is greater than the first coefficient of variation change threshold, and the second coefficient of variation change rate is less than the lower limit of the second coefficient of variation change threshold, a seventh adjustment instruction is generated to reduce the initial weaving speed and the reduction is less than that of the sixth adjustment instruction. If the first coefficient of variation change rate is less than the first coefficient of variation change threshold, and the second coefficient of variation change rate is greater than the upper limit of the second coefficient of variation change threshold, then an eighth adjustment command is generated to increase the initial weaving speed by a smaller amount than the seventh adjustment command.

8. The method for preparing camel hair knitted fabric based on a continuous process path according to claim 5, characterized in that, The process of adjusting the initial drying temperature includes: Calculate the ratio of the fabric shrinkage rate after setting to that before setting, and use it as the shrinkage change rate; The initial drying temperature is adjusted based on the comparison between the shrinkage rate and the shrinkage rate threshold.

9. The method for preparing camel hair knitted fabric based on a continuous process path according to claim 8, characterized in that, The process of adjusting the initial drying temperature also includes: If the shrinkage rate is less than the rate of change threshold, a ninth adjustment command is generated to reduce the initial drying temperature. If the shrinkage rate is greater than the rate of change threshold, a tenth adjustment command is generated to increase the initial drying temperature.

10. The method for preparing camel hair knitted fabric based on a continuous process path according to claim 1, characterized in that, Camel hair raw material is sequentially subjected to opening, impurity removal and mixing pretreatment to obtain pretreated camel hair fiber; During the mixing process, a blending agent is continuously applied to form the mixed fiber stream; The camel hair raw material is camel hair that has been graded, washed and disinfected, and the auxiliary fiber is at least one of cashmere, wool or biodegradable chemical fiber, and the mass percentage of camel hair fiber in the mixed fiber stream is 60% to 70%.

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