Preparation method of color coated yarn blended napping yarn

Abstract

The invention provides a preparation method of color coated yarn blended napping yarn, and belongs to the technical field of textile, the preparation method comprises the following steps: S1, raw material preparation: selecting proper color coated yarn and blend fiber, the color coated yarn is polyester, chinlon or terylene, the blend fiber is cotton, wool, acrylic fiber and terylene, and the blending ratio is 30%-70%; s2, yarn production: blending the color coated yarns and the blend fibers, spinning the blended yarns into yarns through a spinning machine, and adjusting the fineness and the strength of the yarns according to napping requirements; s3, galling treatment: pretreatment and a laser beam fine galling process are carried out; s4, setting and trimming: fixing the structure of the yarn through a heat setting process to ensure that the napping effect is stable; and the part with the non-ideal galling effect is trimmed through a trimming process.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, in particular to a method for preparing a color-coated silk blended napped yarn. Background Art

[0002] Color-coated silk blended brushed yarn has broad application prospects in high-end textiles, but it also faces some technical challenges and R&D difficulties. First of all, due to its unique appearance and feel, color-coated silk blended brushed yarn has important applications in fashion textiles, household fabrics and industrial fabrics. This yarn combines the advantages of different fibers, such as the wear resistance, wrinkle resistance and elastic recovery of polyester, and the rich colors and beauty of colored silk, bringing a new visual effect and tactile experience to textiles1. With the continuous improvement of consumers' demand for textile quality and personalization, the application prospects of color-coated silk blended brushed yarn will be broader. However, the traditional blended yarn brushing process has certain limitations. Mechanical brushing may cause yarn damage, chemical treatment may cause environmental pollution, and heat treatment may cause problems such as uneven hairiness or low product precision. These problems not only affect the quality of the product, but also limit the further application and promotion of color-coated silk blended brushed yarn. Summary of the invention

[0003] In view of the shortcomings of the prior art, the present invention provides a method for preparing a color-coated silk blended napped yarn. By introducing the laser beam fine napping process into the preparation process of the color-coated silk blended napped yarn, the surface hairiness effect, uniformity and aesthetics of the yarn can be significantly improved, and the problems of uneven hairiness and surface damage existing in the traditional napping process can be solved. In addition, the high efficiency, environmental protection and precise control characteristics of the process also provide more innovative technical support for the production of high-end textiles.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A method for preparing a color-coated silk blended napped yarn comprises the following steps:

[0006] S1. Raw material preparation: Select appropriate color-coated yarn and blended fiber. The color-coated yarn is polyester, nylon or polyester, and the blended fiber is cotton, wool, acrylic, polyester, etc. The blending ratio is between 30% and 70%;

[0007] S2. Yarn production: The color-coated silk is blended with the blended fiber and spun into yarn through a spinning machine. The fineness and strength of the yarn are adjusted according to the napping requirements;

[0008] S3, roughening treatment:

[0009] i) Pretreatment: degreasing and removing impurities from the yarn, and adjusting the moisture content and surface roughness;

[0010] ii) Laser beam fine hairing process: Use laser beam to finely hair the surface of color-coated silk blended yarn to form a uniform and delicate hairiness effect, including:

[0011] Select the appropriate laser wavelength as CO2 laser or fiber laser, and irradiate the surface of the yarn with the laser beam through the scanning system;

[0012] Adjust the laser power to 10W-200W, the scanning speed to 50mm / s-500mm / s and the scanning interval to 0.5mm-3mm to control the length and density of the hairiness;

[0013] Control the laser irradiation time to 10ms-300ms and the temperature, and use air cooling or water cooling system to prevent overheating and damage to the yarn;

[0014] S4, shaping and finishing:

[0015] i) Fix the structure of the yarn through the heat setting process to ensure the stable napping effect;

[0016] ii) Laser trimming, mechanical trimming or chemical trimming are performed on the parts where the hairing effect is not ideal to ensure that the hairiness is uniform and stable.

[0017] Preferably, the laser power of the laser beam fine roughening process is 50W to 100W, the scanning speed is 100mm / s to 300mm / s, the scanning interval is 1mm to 2mm, and the laser irradiation time is 10ms to 100ms.

[0018] Preferably, the laser beam fine roughening process uses CO2 laser or fiber laser, and the laser scanning mode is one of linear scanning, circular scanning or spiral scanning, which is adjusted according to the needs of the yarn.

[0019] Preferably, the heat setting process comprises:

[0020] a) Use a setting machine to heat the yarn to 130°C to 180°C and maintain the temperature for 30 seconds to 2 minutes to ensure that the shape of the yarn is stable and the effect of napping is fixed;

[0021] b) The yarn is cooled after being shaped, and the cooling process is carried out slowly to ensure that the hairiness on the yarn surface is not damaged.

[0022] Preferably, the finishing process comprises:

[0023] a) Laser trimming: trimming the excessive or uneven hairiness with low-power laser;

[0024] b) Use mechanical finishing equipment such as fiber brushes or grinding wheels to remove uneven hairiness;

[0025] c) Use softeners or antistatic agents to chemically modify the yarn surface to improve the uniformity of the hairiness.

[0026] Preferably, the laser power of the laser trimming is in the range of 1 W to 5 W, the speed of the mechanical trimming is in the range of 5 m to 10 m per minute, the concentration of the softener is in the range of 0.5% to 2%, and the concentration of the antistatic agent is in the range of 0.2% to 0.8%.

[0027] Preferably, the pretreatment step includes cleaning with a solvent, washing with hot water or centrifuging to remove oil stains and impurities attached to the surface of the yarn.

[0028] Preferably, the laser beam fine napping process has different parameter settings for different yarn types, and ensures that different yarns can achieve the expected napping effect by adjusting the adaptability of different blending ratios and fiber types.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The present invention provides a method for preparing a color-coated silk blended napped yarn. By introducing a laser beam fine napping process into the preparation process of the color-coated silk blended napped yarn, the surface hairiness effect, uniformity and aesthetics of the yarn can be significantly improved, and the problems of uneven hairiness and surface damage existing in the traditional napping process can be solved.

[0031] The laser process of the present invention reduces physical friction and material waste, improves production efficiency and the service life of yarn, and laser roughening does not require the use of chemicals or other additives, reducing pollution to the environment. In addition, the laser can be finely adjusted according to the material of different fibers to meet the production needs of different types of color-coated silk blended yarns.

[0032] 5. Conclusion

[0033] By introducing the laser beam fine napping process into the preparation process of color-coated silk blended napping yarn, the surface hairiness effect, uniformity and aesthetics of the yarn can be significantly improved, and the problems of uneven hairiness and surface damage in the traditional napping process can be solved. In addition, the high efficiency, environmental protection and precise control characteristics of this process also provide more innovative technical support for the production of high-end textiles. DETAILED DESCRIPTION

[0034] The present invention is described in further detail below.

[0035] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be used for other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0036] The present invention provides a method for preparing a color-coated silk blended napped yarn, comprising the following steps:

[0037] S1. Raw material preparation

[0038] Color coated yarn selection: select the appropriate color coated yarn according to the color and performance requirements of the required product; the available color coated yarns include polyester, nylon, and polyester.

[0039] Blended fiber selection: Choose fibers suitable for blending with color covered silk, such as cotton, wool, acrylic, and polyester.

[0040] The blending ratio is usually between 30% and 70%.

[0041] S2. Yarn production

[0042] The colored covered yarn is blended with the blended fiber and spun into yarn through a spinning machine. The fineness and strength of the yarn are adjusted according to the subsequent napping requirements.

[0043] S3, roughening treatment

[0044] i) Pretreatment: degreasing and removing impurities from the yarn, and adjusting the moisture content and surface roughness;

[0045] ii) Laser beam fine hairing process: Use laser beam to finely hair the surface of color-coated silk blended yarn to form a uniform and delicate hairiness effect, including:

[0046] Select the appropriate laser wavelength as CO2 laser or fiber laser, and irradiate the surface of the yarn with the laser beam through the scanning system;

[0047] Adjust the laser power to 10W-200W, the scanning speed to 50mm / s-500mm / s and the scanning interval to 0.5mm-3mm to control the length and density of the hairiness;

[0048] The laser irradiation time is controlled to be 10ms-300ms and the temperature is controlled, and the yarn is prevented from being damaged by overheating through air flow cooling or water cooling system.

[0049] S4, shaping and finishing:

[0050] i) Fix the structure of the yarn through the heat setting process to ensure the stable napping effect;

[0051] ii) Laser trimming, mechanical trimming or chemical trimming are performed on the parts where the hairing effect is not ideal to ensure that the hairiness is uniform and stable.

[0052] It should be noted that the present application uses a laser beam fine napping process as an important step in the preparation of color-coated silk blended napped yarns, using the thermal effect, precise positioning capability and local melting effect of the laser to accurately control the formation of yarn surface hairiness. This process can overcome the problems of uneven hairiness and surface damage caused by traditional mechanical napping, and has the characteristics of high precision and low loss. The laser beam fine napping process is as follows:

[0053] 1. The principle of laser beam fine roughening process

[0054] Thermal effect of laser beam: The laser beam acts on the surface of the yarn to locally heat the fiber surface area, causing the surface fiber to melt or carbonize. By controlling the power and irradiation time of the laser, the length and density of the hairiness can be precisely controlled;

[0055] Partial melting and napping: The partially melted fibers on the yarn surface are pulled apart to form hairiness. The degree of melting, the bonding force of the fibers, and the physical properties of the yarn itself will affect the final napping effect.

[0056] 2. Specific steps of laser beam fine roughening process

[0057] Laser beam selection and scanning: Select the appropriate laser wavelength (usually CO2 laser or fiber laser) and focus the laser beam on the yarn surface. The laser scanning method can be linear scanning, circular scanning or spiral scanning. Adjust the scanning mode according to the desired roughening effect.

[0058] Yarn delivery and laser positioning: The yarn is evenly delivered into the irradiation range of the laser beam through a precise yarn delivery system. The laser beam scans the yarn surface multiple times through a scanning system and irradiates according to a predetermined path and frequency.

[0059] Adjustment of the roughening effect:

[0060] Laser power adjustment: According to the material of the yarn, the surface coating and the required hairiness effect, adjust the power of the laser (general range: 10W-200W). Lower power produces fine hairiness, and higher power produces coarse hairiness.

[0061] Scanning speed and spacing adjustment: The density and length of the hairiness can be controlled by adjusting the scanning speed (generally 50-500mm / s) and scanning spacing (0.5-3mm). Smaller scanning spacing and slower scanning speed will produce a denser hairiness effect.

[0062] Laser irradiation time control: adjust the laser irradiation time according to the melting point of different fibers, usually adjusted between 10ms-300ms to ensure that the molten layer is moderate and uniform.

[0063] Temperature control and cooling: During the laser roughening process, the yarn may be thermally damaged due to the local high temperature effect. In order to avoid excessive ablation, a cooling system such as air flow cooling or water cooling system is required to maintain the stability of the yarn.

[0064] 3. Specific control of process parameters

[0065] Laser power: Adjust the power to control the thickness of the hairiness. For textile fibers, use a power range of 50W-100W.

[0066] Scanning speed: Scanning speed affects the length of the hairiness, and the speed range is 100mm / s to 300mm / s. Slower scanning speeds can produce longer hairiness.

[0067] Scanning spacing: determines the density of hairiness. The recommended spacing range is 1mm to 2mm. Smaller spacing produces higher density hairiness.

[0068] Laser irradiation time: usually set to 10ms to 100ms to ensure that the fiber surface is melted but not excessively ablated.

[0069] 4. Evaluation of the effect after laser roughening

[0070] Hairiness morphology: Check whether the hairiness morphology is uniform and whether the hairiness length and density meet the requirements.

[0071] Yarn surface smoothness: Check the yarn surface under a microscope to ensure that the surface after napping is smooth, without excessive damage or loose hairiness.

[0072] Hairiness stability: The hairiness effect should remain stable after heat setting to avoid fading, hairiness falling off and other problems in subsequent use.

[0073] It should be noted that the present application fixes the structure of the yarn through a heat setting process to ensure a stable napping effect; the specific steps of the heat setting process are:

[0074] Heat setting equipment selection:

[0075] Setting machine: Choose a setting machine with a temperature control system and a pressure control system, which can accurately control the temperature and pressure to prevent excessive temperature or excessive pressure from affecting the hairiness of the yarn surface. Commonly used equipment includes hot air setting machine and steam setting machine.

[0076] Setting temperature and time: Determine the appropriate setting temperature based on the type of fiber (such as polyester, nylon, etc.) and the characteristics of the yarn after laser treatment. The general setting temperature range is 130℃-180℃. The specific temperature should be fine-tuned based on the thermal stability of the fiber and the hairiness structure after laser beam hairing. The setting time is generally between 30 seconds and 2 minutes.

[0077] Heat setting process steps:

[0078] Preheating the yarn: First, preheat the yarn to a temperature close to the setting temperature through the heating system, so that the subsequent heat setting treatment is more uniform;

[0079] High temperature shaping: The preheated yarn is sent to the shaping equipment and kept for a period of time under controlled temperature and pressure to ensure the stability of the yarn shape and fix the napping effect.

[0080] If using a hot air setting machine, make sure the hot air is blown evenly to the yarn to avoid local temperatures that are too high or too low.

[0081] If steam setting is used, the steam temperature is generally controlled between 150℃-170℃, and the steam treatment time should be adjusted appropriately according to the material of the yarn and the napping effect.

[0082] Cooling: The yarn after shaping needs to be gradually cooled down through the cooling system to avoid the morphological changes of the yarn caused by rapid cooling. The cooling method can be natural cooling or cold air drying. The cooling process should be carried out slowly to ensure that the hairiness effect on the yarn surface is not destroyed.

[0083] It should be noted that the present application uses a trimming process to trim the part where the hair pulling effect is not ideal. The trimming process includes laser trimming, mechanical trimming or chemical trimming to ensure that the hairiness is uniform and stable. The specific steps of the trimming process are:

[0084] Trimming method selection:

[0085] Laser finishing: Based on the laser beam fine hairing process, a secondary laser treatment is used to trim excessive hairiness or uneven hairing. The wavelength, power and scanning speed of the laser can be adjusted as needed to finely trim the transition area and avoid damaging the yarn surface.

[0086] Mechanical finishing: Use micro grinding wheels or fiber brushes to evenly polish the yarn and remove the excessive hairiness. The choice of such equipment should be determined according to the material of the yarn and the napping effect.

[0087] Chemical finishing: Using chemical agents to finish the yarn surface can effectively reduce the adhesion of the hairiness and improve the uniformity of the hairiness. Chemical agents can be softeners, antistatic agents, etc. These agents can improve the hairiness effect without affecting the yarn structure.

[0088] Repair process:

[0089] 1. Trim:

[0090] Laser trimming: According to the fuzzing effect, select appropriate laser parameters to trim the yarn surface. The laser beam can achieve more precise trimming through low power and small focal length, focusing on the part with excessive fuzzing and irregular hairiness.

[0091] Mechanical dressing: Gently remove uneven hairiness using a device such as a fiber brush or abrasive wheel. Make sure this process is very delicate to avoid over-dressing that will cause the hairiness to disappear.

[0092] Chemical finishing: Use softener or antistatic agent chemicals to treat the yarn surface. It can be sprayed or soaked to ensure the softness of the yarn and the appropriate retention of hairiness.

[0093] 2. Drying and shaping after trimming:

[0094] The trimmed yarn needs to be dried through drying equipment to ensure that the chemicals are completely dried and restore the normal shape of the yarn.

[0095] After drying, a further heat setting treatment can be carried out to ensure that the shape of the yarn after trimming is stable.

[0096] The key parameters of laser trimming are:

[0097] Laser power: low power, the power range is adjusted to 1W-5W, selected according to the needs of hairiness trimming.

[0098] Mechanical dressing speed: 5m-10m per minute, adjust the speed to avoid yarn damage.

[0099] Chemical finishing agents: The concentration of softener is 0.5%-2%, and the concentration of antistatic agent is 0.2%-0.8%. The specific concentration is adjusted according to the requirements of the yarn.

[0100] Among them, this application is aimed at the performance of different fibers (such as polyester, nylon, cotton, wool, etc.) in the laser beam fine napping process and heat setting process. It is indeed necessary to adjust the process parameters according to the thermal stability, elasticity, hygroscopicity and other characteristics of each fiber. This application provides the napping process parameters and heat setting process parameters of several common fibers:

[0101] 1. Polyester (PET)

[0102] Polyester is a thermoplastic synthetic fiber with good thermal stability and is suitable for laser beam roughening and heat setting treatments.

[0103] Laser beam fine roughening process parameters:

[0104] Laser power: 2W-5W (medium power, to avoid overheating that may cause fiber deformation or melting);

[0105] Scanning speed: 20-40mm / s;

[0106] Focal length: 3-5mm (smaller focal length, fine control of roughening effect);

[0107] Pulse frequency: 10-20kHz (lower frequency to avoid excessive heat accumulation).

[0108] Heat setting process parameters:

[0109] Setting temperature: 160℃-180℃ (polyester has a higher melting point and is suitable for high temperature setting);

[0110] Setting time: 30 seconds - 2 minutes (select the appropriate time according to the type of setting machine);

[0111] Cooling method: slow cooling or air cooling to avoid sudden changes in yarn shape caused by rapid cooling.

[0112] 2. Nylon (PA)

[0113] Nylon (especially nylon 6 and nylon 66) has good elasticity and a high melting point, but it is more sensitive to temperature, so more precise control is required during napping and shaping.

[0114] Laser beam fine roughening process parameters:

[0115] Laser power: 1W-3W (lower power to avoid melting or damage to nylon);

[0116] Scanning speed: 15-30mm / s;

[0117] Focal length: 2-4mm (a smaller focal length helps to form fine hairs);

[0118] Pulse frequency: 10kHz-15kHz;

[0119] Heat setting process parameters:

[0120] Setting temperature: 150℃-170℃ (nylon has poor thermal stability and too high temperature can easily damage the fiber);

[0121] Setting time: 20 seconds to 1 minute;

[0122] Cooling method: natural cooling, avoid rapid cooling to avoid uneven shape.

[0123] 3. Cotton

[0124] Cotton fiber is natural and has good moisture absorption and air permeability, but its thermal stability is poor, especially at high temperatures, it is easy to shrink or deform the fiber. Therefore, the napping and heat setting process of cotton fiber should be adjusted carefully.

[0125] Laser beam fine roughening process parameters:

[0126] Laser power: 1W-3W (lower power to avoid high temperature causing charring or damage of cotton fibers);

[0127] Scanning speed: 15-25mm / s;

[0128] Focal length: 4-6mm (moderate focal length to ensure uniformity of hairiness);

[0129] Pulse frequency: 5kHz-10kHz.

[0130] Heat setting process parameters:

[0131] Setting temperature: 120℃-150℃ (avoid shrinkage or deformation of cotton fibers caused by excessively high temperature);

[0132] Setting time: 30 seconds to 1 minute;

[0133] Cooling method: natural cooling or slow air cooling, avoid too fast cooling.

[0134] 4. Wool

[0135] Wool has good elasticity, warmth retention and moisture absorption, but it has poor thermal stability and is prone to deformation and shrinkage during the napping and shaping process, so more careful process control is required.

[0136] Laser beam fine roughening process parameters:

[0137] Laser power: 1W-2W (low power to avoid damage to wool fibers under high temperature);

[0138] Scanning speed: 10-20mm / s;

[0139] Focal length: 5-7mm (longer focal length helps to reduce wool damage caused by excessive laser focusing);

[0140] Pulse frequency: 5kHz-10kHz.

[0141] Heat setting process parameters:

[0142] Setting temperature: 80℃-100℃ (wool has poor heat resistance, and too high temperature may cause wool to shrink or be damaged);

[0143] Setting time: 20 seconds - 40 seconds;

[0144] Cooling method: natural cooling to avoid changes in fiber morphology caused by rapid cooling.

[0145] 5. Polypropylene (PP)

[0146] Polypropylene is a thermoplastic polymer that is resistant to high temperatures and has good thermal stability. However, due to its smooth surface, less hairiness may be produced during the roughening process, so extra attention needs to be paid during laser roughening.

[0147] Laser beam fine roughening process parameters:

[0148] Laser power: 3W-5W (medium power, polypropylene can withstand higher laser power);

[0149] Scanning speed: 25-45mm / s;

[0150] Focal length: 3-5mm (moderate focal length to create a finer feather effect);

[0151] Pulse frequency: 15kHz-20kHz.

[0152] Heat setting process parameters:

[0153] Setting temperature: 170℃-190℃ (polypropylene has a higher melting point and is suitable for setting at a higher temperature);

[0154] Setting time: 30 seconds to 1 minute;

[0155] Cooling method: air cooling or natural cooling to keep the yarn in a stable shape.

[0156] Summary of the napping process parameters and heat setting process parameters of the above fibers:

[0157] Fiber type Laser power Scanning speed Focal length Setting temperature Setting time

[0158] Polyester 2W-5W 20-40mm / s 3-5mm 160℃-180℃30sec-2min

[0159] Fiber type Laser power Scanning speed Focal length Setting temperature Setting time

[0160] Nylon 1W-3W 15-30mm / s 2-4mm 150℃-170℃20s-1min

[0161] Cotton 1W-3W 15-25mm / s 4-6mm 120℃-150℃30s-1min

[0162] Wool 1W-2W 10-20mm / s 5-7mm 80℃-100℃20s-40s

[0163] Polypropylene 3W-5W 25-45mm / s 3-5mm 170℃-190℃30s-1min

[0164] Among them, the trimming process in this application also needs to be adjusted according to the properties of the fiber, its sensitivity to heat, its mechanical properties, etc. The trimming mainly includes laser fine trimming, chemical trimming, mechanical trimming and other processes:

[0165] 1. Polyester (PET) finishing process parameters

[0166] When trimming polyester fibers, the main focus is on the uniformity of the surface hairiness and the stability of the strength. Since polyester has good thermal stability, a combination of laser trimming and mechanical trimming is usually used.

[0167] Laser fine finishing:

[0168] Laser power: 2W-4W (avoid excessive power to ensure that the surface hairiness is not melted or damaged);

[0169] Scanning speed: 30-50 mm / s (higher scanning speed adapts to the structure of polyester and avoids excessive heat accumulation);

[0170] Focal length: 3-5mm (fine control of the uniformity of hairiness);

[0171] Pulse frequency: 10kHz-15kHz (to ensure a delicate and uniform trimming effect);

[0172] Chemical finishing (removing impurities and adjusting surface gloss):

[0173] Chemical agents: use softeners, detergents, gloss agents, etc. (select different chemical agents according to the use requirements of the yarn);

[0174] Processing temperature: 60℃-80℃ (low temperature treatment to avoid changes in fiber morphology caused by overheating);

[0175] Processing time: 10-20 minutes;

[0176] Liquid concentration: Depends on the specific ratio of chemical finishing agent, usually 2%-5% chemical solution.

[0177] Mechanical finishing (brushing, trimming):

[0178] Brushing pressure: 0.1-0.2N / cm (gentle brushing to avoid excessive wear of fibers);

[0179] Pruning tool: Use a special precision pruning knife with a blade spacing of 0.5-1mm for fine pruning.

[0180] 2. Nylon (PA) finishing process parameters

[0181] Nylon fiber has good elasticity, but relatively poor thermal stability, so special attention must be paid to controlling heat during trimming to avoid damaging the fiber structure.

[0182] Laser fine finishing:

[0183] Laser power: 1W-2W (lower power to avoid overheating of the fiber);

[0184] Scanning speed: 15-25mm / s (lower scanning speed to avoid local overheating);

[0185] Focal length: 2-3mm (smaller focal length is good for retouching details);

[0186] Pulse frequency: 8kHz-12kHz.

[0187] Chemical finishing:

[0188] Chemical agents: softeners, antistatic agents, detergents, etc. for nylon;

[0189] Processing temperature: 50℃-70℃ (avoid excessively high temperature that may damage the fiber);

[0190] Processing time: 5-15 minutes;

[0191] Liquid concentration: 1%-3% chemical solution.

[0192] Mechanical trimming (pruning):

[0193] Trimming tool spacing: 0.3-0.5mm (fine trimming);

[0194] Trimming blade speed: 500-1000rpm (moderate speed ensures detailed trimming).

[0195] 3. Cotton finishing process parameters

[0196] The main purpose of cotton fiber surface finishing is to remove surface impurities, trim surface hairiness and enhance surface gloss. Cotton fiber is relatively natural and its finishing process is relatively gentle.

[0197] Laser fine finishing:

[0198] Laser power: 1W-2W (lower power to avoid charring or overheating of cotton fibers);

[0199] Scanning speed: 20-30mm / s (medium speed to ensure uniform roughening and finishing effect);

[0200] Focal length: 4-6mm (larger focal length to avoid excessive heat concentration and prevent fiber damage);

[0201] Pulse frequency: 5kHz-8kHz.

[0202] Chemical finishing:

[0203] Chemicals: Use natural softeners, stain removers, etc. (add mild bleach if necessary);

[0204] Processing temperature: 30℃-50℃ (low temperature protection fiber);

[0205] Processing time: 10-15 minutes;

[0206] Liquid concentration: 1%-2% (adjusted according to the selected chemical concentration).

[0207] Mechanical finishing (brushing and trimming):

[0208] Brushing pressure: 0.05-0.1N / cm (brush gently to avoid damaging the fibers);

[0209] Trimming tool: Use 0.5mm-1mm trimming tool to finely trim the hairiness.

[0210] 4. Wool finishing process parameters

[0211] The trimming of wool fibers is particularly important because wool fibers are delicate and easily deformed by heat, so special care must be taken during trimming.

[0212] Laser fine finishing:

[0213] Laser power: 0.5W-1W (very low power to avoid damaging wool fibers);

[0214] Scanning speed: 10-20mm / s (lower scanning speed to ensure uniform roughening and fine finishing);

[0215] Focal length: 5-7mm (longer focal length to avoid excessive heat concentration);

[0216] Pulse frequency: 5kHz-8kHz.

[0217] Chemical finishing:

[0218] Chemical agents: wool-specific softener, detergent, etc.;

[0219] Processing temperature: 40℃-60℃ (low temperature protects wool fibers);

[0220] Processing time: 5-10 minutes;

[0221] Liquid concentration: 1%-3% softener solution.

[0222] Mechanical finishing (trimming and brushing):

[0223] Brush pressure: 0.05-0.1N / cm (soft brush);

[0224] Trimming tool spacing: 0.5-1mm (fine trimming of hairiness);

[0225] Trimming tool speed: 300-600rpm (low speed to avoid over-trimming).

[0226] 5. Polypropylene (PP) trimming process parameters

[0227] Polypropylene fibers are usually smooth, and the main focus during trimming is on the uniformity and glossiness of the surface hairiness. Laser fine trimming:

[0228] Laser power: 3W-4W (higher power, polypropylene fiber can withstand higher laser power);

[0229] Scanning speed: 30-45mm / s (higher speed ensures uniform trimming effect);

[0230] Focal length: 3-5mm (moderate focal length can ensure uniform roughening effect);

[0231] Pulse frequency: 12kHz-20kHz.

[0232] Chemical finishing:

[0233] Chemical agents: softeners and gloss agents suitable for polypropylene;

[0234] Processing temperature: 50℃-70℃;

[0235] Processing time: 5-10 minutes;

[0236] Liquid concentration: 1%-3%.

[0237] Mechanical finishing (brushing and trimming):

[0238] Brush pressure: 0.2-0.4N / cm (moderate pressure ensures a smooth surface);

[0239] Trimming tool spacing: 1mm-2mm (used to trim the hairiness on the surface of coarse fibers);

[0240] Trimming blade speed: 800-1200rpm.

[0241] This application adopts the above method to analyze the effect of laser beam fine napping process on the problems of yarn damage, uneven hairiness and low product precision by adjusting the raw material ratio, napping and shaping and finishing parameters. The details are as follows:

[0242] Example 1

[0243] Raw materials: polyester color covered yarn blended with 50% cotton and 50% polyester;

[0244] Laser parameters: CO2 laser, power 75W, scanning speed 200mm / s, scanning interval 1.5mm, irradiation time 50ms;

[0245] Heat setting: 150℃, 1 minute;

[0246] Trimming: Laser trimming, power 3W;

[0247] Analysis: The laser beam fine hairing process effectively solves the problem of uneven hairiness on the yarn surface, and laser trimming further ensures the uniformity of the hairiness. Heat setting fixes the yarn structure and reduces damage.

[0248] Example 2

[0249] Raw materials: Nylon color covered silk blended with 70% wool;

[0250] Laser parameters: fiber laser, power 50W, scanning speed 100mm / s, scanning interval 1mm, irradiation time 30ms;

[0251] Heat setting: 160℃, 1.5 minutes;

[0252] Dressing: Mechanical dressing, speed 7m per minute;

[0253] Analysis: For wool blended yarn, the laser beam process provides a delicate hairiness effect, and mechanical finishing removes uneven parts, with high overall product precision.

[0254] Example 3

[0255] Raw materials: polyester color covered yarn blended with 30% acrylic;

[0256] Laser parameters: CO2 laser, power 100W, scanning speed 300mm / s, scanning interval 2mm, irradiation time 100ms;

[0257] Heat setting: 130℃, 30 seconds;

[0258] Finishing: Chemical finishing, softener concentration 1%;

[0259] Analysis: The combination of high-power laser and fast scanning speed is suitable for acrylic blended yarns, and chemical finishing further improves the uniformity of hairiness.

[0260] Example 4

[0261] Raw materials: polyester color covered yarn blended with 40% cotton and 60% polyester;

[0262] Laser parameters: fiber laser, power 80W, scanning speed 250mm / s, scanning spacing 1.2mm, irradiation time 60ms;

[0263] Heat setting: 170℃, 1 minute;

[0264] Trimming: Laser trimming, power 2W;

[0265] Analysis: The combination of laser beam technology and heat setting effectively reduces yarn damage, and laser trimming ensures the fineness and uniformity of the hairiness.

[0266] Example 5

[0267] Raw materials: Nylon color covered yarn blended with 60% wool and 40% polyester;

[0268] Laser parameters: CO2 laser, power 60W, scanning speed 150mm / s, scanning interval 1.8mm, irradiation time 40ms;

[0269] Heat setting: 140℃, 1.2 minutes;

[0270] Dressing: Mechanical dressing, speed 6m per minute;

[0271] Analysis: The laser beam process provides a uniform hairiness effect, and mechanical trimming removes excess hairiness, giving the product a good overall appearance.

[0272] Example 6

[0273] Raw materials: Polyester color covered yarn blended with 50% wool and 50% acrylic;

[0274] Laser parameters: fiber laser, power 90W, scanning speed 220mm / s, scanning spacing 1.6mm, irradiation time 80ms;

[0275] Heat setting: 165℃, 1.5 minutes;

[0276] Finishing: Chemical finishing, antistatic agent concentration 0.5%;

[0277] Analysis: The laser beam process combined with antistatic agent finishing reduces yarn static and improves the uniformity of hairiness.

[0278] Example 7

[0279] Raw materials: polyester color covered yarn blended with 35% wool and 65% polyester;

[0280] Laser parameters: CO2 laser, power 150W, scanning speed 400mm / s, scanning interval 0.8mm, irradiation time 120ms;

[0281] Heat setting: 180℃, 2 minutes;

[0282] Trimming: Laser trimming, power 4W;

[0283] Analysis: High-power laser and fast scanning speed are suitable for wool and polyester blends. Laser trimming ensures the fineness and uniformity of the feathers.

[0284] Example 8

[0285] Raw materials: Nylon color covered silk blended with 70% cotton;

[0286] Laser parameters: fiber laser, power 55W, scanning speed 120mm / s, scanning spacing 1.1mm, irradiation time 25ms;

[0287] Heat setting: 145°C, 1 minute;

[0288] Dressing: Mechanical dressing, speed 8m per minute;

[0289] Analysis: The combination of laser beam technology and mechanical finishing is suitable for cotton blended yarn, reducing yarn damage and improving product precision.

[0290] Example 9

[0291] Raw materials: Polyester color covered yarn blended with 45% wool and 55% polyester;

[0292] Laser parameters: CO2 laser, power 120W, scanning speed 280mm / s, scanning interval 1.4mm, irradiation time 90ms;

[0293] Heat setting: 175°C, 1.3 minutes;

[0294] Finishing: Chemical finishing, softener concentration 1.5%;

[0295] Analysis: The combination of laser beam technology and softener finishing improves the uniformity of hairiness and the softness of yarn.

[0296] Example 10

[0297] Raw materials: polyester color covered yarn blended with 65% wool and 35% polyester;

[0298] Laser parameters: fiber laser, power 100W, scanning speed 180mm / s, scanning spacing 1.7mm, irradiation time 70ms;

[0299] Heat setting: 155°C, 1.4 minutes;

[0300] Trimming: Laser trimming, power 1W;

[0301] Analysis: The combination of laser beam technology and low-power laser trimming ensures the fineness and uniformity of wool blended yarn hairiness and reduces yarn damage.

[0302] Through the above embodiments, it can be seen that the laser beam fine napping process has a significant effect in solving yarn damage, uneven hairiness, low product precision, etc. By adjusting laser parameters (such as power, scanning speed, scanning spacing, irradiation time), selecting a suitable laser type (CO2 laser or fiber laser) and scanning mode (linear scanning, circular scanning or spiral scanning), the expected napping effect can be achieved for yarns with different blending ratios and fiber types.

[0303] Those skilled in the art should understand that the embodiments of the present invention shown in the above description are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A method for preparing a color-coated silk blended napped yarn, characterized in that: The following steps are involved: S1. Raw material preparation: Select appropriate color-coated yarn and blended fiber. The color-coated yarn is polyester, nylon or polyester. The blended fiber is cotton, wool, acrylic and polyester. The blending ratio is between 30% and 70%. S2. Yarn production: The color-coated silk is blended with the blended fiber and spun into yarn through a spinning machine. The fineness and strength of the yarn are adjusted according to the napping requirements; S3, roughening treatment: i) Pretreatment: degreasing and removing impurities from the yarn, and adjusting the moisture content and surface roughness; ii) Laser beam fine hairing process: Use laser beam to finely hair the surface of color-coated silk blended yarn to form a uniform and delicate hairiness effect, including: Select the appropriate laser wavelength as CO2 laser or fiber laser, and irradiate the surface of the yarn with the laser beam through the scanning system; Adjust the laser power to 10W-200W, the scanning speed to 50mm / s-500mm / s and the scanning interval to 0.5mm-3mm to control the length and density of the hairiness; Control the laser irradiation time to 10ms-300ms and the temperature, and use air cooling or water cooling system to prevent overheating and damage to the yarn; S4, shaping and finishing: i) Fix the structure of the yarn through the heat setting process to ensure the stable napping effect; ii) The parts with unsatisfactory hairiness are trimmed by a trimming process, which includes laser trimming, mechanical trimming or chemical trimming to ensure uniform and stable hairiness.

2. The method for preparing a color-covered silk blended napped yarn according to claim 1, characterized in that: The laser power of the laser beam fine roughening process is 50W to 100W, the scanning speed is 100mm / s to 300mm / s, the scanning interval is 1mm to 2mm, and the laser irradiation time is 10ms to 100ms.

3. The method for preparing a color-covered silk blended napped yarn according to claim 1, characterized in that: The laser beam fine roughening process adopts CO2 laser or fiber laser, and the laser scanning mode is one of linear scanning, circular scanning or spiral scanning, which is adjusted according to the needs of the yarn.

4. The method for preparing a color-covered silk blended napped yarn according to claim 1, characterized in that: The heat setting process comprises: a) Use a setting machine to heat the yarn to 130°C to 180°C and maintain the temperature for 30 seconds to 2 minutes to ensure that the shape of the yarn is stable and the effect of napping is fixed; b) The yarn is cooled after being shaped, and the cooling process is carried out slowly to ensure that the hairiness on the yarn surface is not damaged.

5. The method for preparing a color-covered silk blended napped yarn according to claim 1, characterized in that: The finishing process comprises: a) Laser trimming: trimming the excessive or uneven hairiness with low-power laser; b) Use mechanical finishing equipment such as fiber brushes or grinding wheels to remove uneven hairiness; c) Use softeners or antistatic agents to chemically modify the yarn surface to improve the uniformity of the hairiness.

6. The method for preparing a color-covered silk blended napped yarn according to claim 5, characterized in that: The laser power range of the laser trimming is 1W to 5W, the speed of the mechanical trimming is 5m to 10m per minute, the concentration of the softener is 0.5% to 2%, and the concentration of the antistatic agent is 0.2% to 0.8%.

7. The method for preparing a color-covered silk blended napped yarn according to claim 1, characterized in that: The pretreatment step includes cleaning with a solvent, washing with hot water or centrifuging to remove oil and impurities attached to the surface of the yarn.

8. The method for preparing a color-covered silk blended napped yarn according to claim 1, characterized in that: The laser beam fine napping process has different parameter settings for different yarn types, and ensures that different yarns can achieve the expected napping effect by adjusting the adaptability of different blending ratios and fiber types.