A method of making a knitted fabric

Abstract

The application relates to the technical field of knitted fabric, in particular to a preparation method of knitted fabric, which comprises the following steps: S1, raw material preparation, including polyester low-elasticity profiled yarn, bamboo fiber yarn, cotton blended yarn and silver ion antibacterial master batch; S2, raw material modification treatment, the polyester low-elasticity profiled yarn is immersed in a polyethylene glycol modifier solution for impregnation, and is dried after being taken out, so that modified polyester profiled yarn is obtained; the silver ion antibacterial master batch is mixed with the bamboo fiber yarn in a high-speed mixer, so that antibacterial bamboo fiber yarn is obtained; S3, weaving, the modified polyester profiled yarn, the antibacterial bamboo fiber yarn and the cotton blended yarn are sent into a double-sided weft knitting machine according to a proportion for weaving, so that knitted fabric grey cloth is obtained; S4, grey cloth impregnation, the knitted fabric grey cloth is impregnated in an impregnation equipment carrying desizing and refining liquid; and S5, setting, the knitted fabric grey cloth after the grey cloth impregnation is sent into a preshrinking machine for preshrinking setting. Long-acting antibacterial and moisture absorption and air permeation are realized through raw material modification, so that the fabric quality is ensured.

Description

Technical Field

[0001] This invention relates to the field of knitted fabric technology, and in particular to a method for preparing knitted fabric. Background Technology

[0002] Knitted fabrics are widely used in underwear, sportswear and casual wear due to their good stretchability, soft touch and excellent breathability. With the improvement of people's living standards and the enhancement of health awareness, consumers have put forward higher requirements for the functionality of knitted fabrics, such as antibacterial and bacteriostatic properties, and comfort, such as moisture wicking and skin-friendly feel.

[0003] However, existing knitted fabric production and processing technologies still have the following problems in practical applications:

[0004] Firstly, regarding antibacterial properties, traditional antibacterial knitted fabrics often employ post-treatment padding with antibacterial agents. Fabrics produced using this method do not have a lasting antibacterial effect, and the antibacterial agent is easily lost after multiple washes, leading to a significant decrease in antibacterial function. Although bamboo fiber itself has certain natural antibacterial properties, its broad-spectrum and potent antibacterial activity is still insufficient when facing complex bacterial environments, making it difficult to meet high hygiene standards.

[0005] Secondly, regarding the properties of raw materials, although polyester fiber has advantages such as high strength, good elasticity, and strong wrinkle resistance, its molecular structure is compact and lacks hydrophilic groups, resulting in low moisture regain, poor moisture absorption, and a tendency to generate static electricity. Especially in summer or when sweating during exercise, ordinary polyester fabrics cannot wick away sweat in time, easily causing a stuffy feeling and discomfort against the skin, greatly affecting wearing comfort.

[0006] Furthermore, in the pretreatment process of dyeing and finishing, desizing and scouring of knitted fabrics are crucial steps. Traditional scouring processes often use high concentrations of strong alkali at high temperatures. While the cleaning effect is acceptable, it easily damages fiber strength and is energy-intensive and difficult to treat wastewater. If the pretreatment is insufficient, oil and sizing agents will remain on the fabric surface, affecting not only the hand feel and whiteness but also causing uneven dyeing or color variations in subsequent processes.

[0007] Therefore, developing a method for preparing knitted fabrics that can achieve long-lasting antibacterial and moisture-wicking properties through raw material modification, while ensuring fabric quality through optimized pretreatment processes, has become a pressing technical problem in the textile industry. Summary of the Invention

[0008] Therefore, in response to the above problems, this invention proposes a method for preparing knitted fabric, which enables the prepared knitted fabric greige to have long-lasting, washable, broad-spectrum antibacterial and bacteriostatic functions, meeting the demand for high-quality healthy fabrics, and is also moisture-wicking and breathable.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A method for preparing a knitted fabric includes the following steps:

[0011] S1. Raw material preparation, including: 40-55 parts by weight of polyester low-elastic profiled yarn, 25-35 parts by weight of bamboo fiber yarn, 15-25 parts by weight of cotton blended yarn, and 3-8 parts by weight of silver ion antibacterial masterbatch.

[0012] S2. Raw material modification treatment: The polyester low-elastic profiled yarn prepared in step S1 is immersed in a polyethylene glycol modifier solution with a mass concentration of 3%~5% for 30min~40min at a temperature of 60℃~70℃ and a bath ratio of 1:15~1:20. After immersion, it is dried at 100℃~110℃ to obtain modified polyester profiled yarn. The silver ion antibacterial masterbatch prepared in step S1 is mixed with bamboo fiber yarn in a high-speed mixer at a mixing speed of 800r / min~1000r / min for 15min~20min to obtain antibacterial bamboo fiber yarn.

[0013] S3. Weaving: Modified polyester profile yarn, antibacterial bamboo fiber yarn, and cotton blended yarn are fed into a double-sided weft knitting machine according to the ratio for weaving. The machine gauge is set to 28-32 needles, the loop length is 2.8mm-3.2mm, and the weaving speed is 15r / min-20r / min to obtain the knitted fabric greige.

[0014] S4. Fabric impregnation: The knitted fabric is impregnated in an impregnation device containing a desizing and refining solution. The bath ratio is 1:20 to 1:25, the temperature is 80℃ to 90℃, and the treatment time is 40 min to 50 min. The desizing and refining solution contains, by weight, 5 to 8 parts of fatty alcohol polyoxyethylene ether, 3 to 5 parts of sodium carbonate, 1 to 2 parts of sodium silicate, and 85 to 90 parts of deionized water.

[0015] S5. Setting: The knitted fabric after being impregnated with the greige fabric is sent to a pre-shrinking machine for pre-shrinking and setting.

[0016] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0017] The preparation method of this knitted fabric significantly improves the overall performance of the finished fabric by setting raw material modification and specific ratio weaving process. Specifically, polyethylene glycol is used to graft and modify polyester low-elastic profiled yarn, which greatly improves its hydrophilicity and antistatic properties while retaining the high elasticity of polyester. Combined with the moisture-wicking grooves of the profiled cross section, the problem of stuffiness and lack of breathability of traditional polyester fabrics is solved. At the same time, silver ion antibacterial masterbatch is pre-melted and mixed with bamboo fiber yarn, which achieves a deeper binding of antibacterial factors compared with traditional finishing coatings. This gives the fabric long-lasting, washable, broad-spectrum antibacterial and bacteriostatic functions, meeting the demand for high-quality healthy fabrics.

[0018] By setting up a scraping mechanism with flexible adjustment function, and utilizing the elasticity of the torsion spring, the movable scraper can adaptively conform to the surface of the knitted fabric. This design is specifically designed for the characteristics of four-way stretch knitted fabrics, such as large tension fluctuations and uneven thickness during transportation. It can effectively scrape off residual sizing and excess water on the surface, while avoiding fabric abrasions or pilling caused by rigid scraping, thus ensuring the surface smoothness and integrity of the fabric. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention.

[0020] Figure 2 This is a structural schematic diagram of the present invention from another angle.

[0021] Figure 3 This is a schematic diagram of the feeding rack and discharging rack of the present invention.

[0022] Figure 4 For the present invention Figure 3 A structural diagram from another angle.

[0023] Figure 5 This is a schematic diagram of the pressing and feeding mechanism of the present invention.

[0024] Figure 6 This is a schematic diagram of the striking mechanism of the present invention.

[0025] Figure 7 This is a schematic diagram of the integrated dust extraction and drying mechanism of the present invention.

[0026] Figure 8 This is a schematic diagram of the structure of the filter of the present invention.

[0027] Figure 9 This is a schematic diagram of the cross-sectional structure of the filter of the present invention.

[0028] Figure 10 This is a schematic diagram showing the exploded structure of the lower shell, upper shell, filter cylinder, and cleaning unit of the present invention.

[0029] Figure 11 This is a schematic diagram of the upper shell structure of the present invention.

[0030] Figure 12 This is a schematic diagram of the cleaning unit of the present invention.

[0031] Figure 13 This is a structural schematic diagram of the cross-section of the mounting cylinder of the present invention.

[0032] Figure 14 This is a schematic diagram of the structure of the impregnation box of the present invention.

[0033] Figure 15 This is a schematic diagram of the cross-section of the impregnation tank of the present invention.

[0034] Figure 16 This is a schematic diagram of the anti-deviation mechanism of the present invention.

[0035] Figure 17 This is a schematic diagram of the scraping mechanism of the present invention.

[0036] Figure 18 This is a structural schematic diagram of the cross-section of the fixing cover of the present invention.

[0037] Figure 19 This is a schematic plan view of the structure of the movable scraper of the present invention in use.

[0038] Numbering on the map:

[0039] 1. Impregnation chamber; 2. Feeding rack; 3. Discharging rack; 4. Pressing and feeding mechanism; 5. Beating mechanism; 6. Dust extraction and drying integrated mechanism; 7. Guide roller; 8. Anti-deviation mechanism; 9. Scraping mechanism;

[0040] 10. First fixing block; 11. Cylinder; 12. Second fixing block; 13. Feeding roller; 14. Guide bar; 15. Guide sleeve; 16. First side support plate; 17. First motor; 18. Rotating shaft; 19. Disc;

[0041] 20. Mating plate; 21. Sliding column; 22. Rubber head; 23. Spring; 24. Limiting strip; 25. First support plate; 26. Second support plate; 27. Dust extraction fan; 28. First conveying pipe; 29. ​​Filter;

[0042] 30. Second conveying pipe; 31. Dust extraction hood; 32. Third conveying pipe; 33. Drying shell; 34. Hot air output pipe; 35. Hot air output nozzle; 36. Mounting cylinder; 37. Heating wire; 38. Lower shell; 39. Upper shell;

[0043] 40. Bolt; 41. Filter screen cylinder; 42. Blocking block; 43. Support ring; 44. Alignment rod; 45. Cleaning unit; 46. Support frame; 47. Second motor; 48. Cleaning scraper; 49. Assembly sleeve;

[0044] 50. Assembly screws; 51. Assembly nuts; 52. Second side support plate; 53. Third motor; 54. Double-acting screw; 55. Threaded sleeve; 56. Connecting bracket; 57. Anti-deviation ring; 58. Support sleeve; 59. Support rod;

[0045] 60. Fixed scraper; 61. Movable scraper; 62. Mounting block; 63. Fixed shaft; 64. Fixed cover; 65. Torsion spring. Detailed Implementation

[0046] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0047] refer to Figures 1 to 19 This embodiment provides a method for preparing knitted fabric, including the following steps:

[0048] S1. Raw material preparation, including: 40-55 parts by weight of polyester low-elastic profiled yarn, 25-35 parts by weight of bamboo fiber yarn, 15-25 parts by weight of cotton blended yarn, and 3-8 parts by weight of silver ion antibacterial masterbatch. The polyester low-elastic profiled yarn has a trilobal cross-section and a fineness of 150D-200D. The carrier of the silver ion antibacterial masterbatch is polyester resin, and the silver ion content is 2wt%-5wt%.

[0049] S2. Raw material modification treatment: Immerse polyester low-elastic profiled yarn in a polyethylene glycol modifier solution with a mass concentration of 3%~5% for 30min~40min at a temperature of 60℃~70℃ and a bath ratio of 1:15~1:20. After immersion, dry the yarn at 100℃~110℃ to obtain modified polyester profiled yarn. Mix silver ion antibacterial masterbatch with bamboo fiber yarn in a high-speed mixer at a mixing speed of 800r / min~1000r / min for 15min~20min to obtain antibacterial bamboo fiber yarn.

[0050] S3. Weaving: Modified polyester profile yarn, antibacterial bamboo fiber yarn, and cotton blended yarn are fed into a double-sided weft knitting machine according to the ratio for weaving. The machine gauge is set to 28-32 needles, the loop length is 2.8mm-3.2mm, and the weaving speed is 15r / min-20r / min to obtain the knitted fabric greige.

[0051] S4. Fabric impregnation: Immerse the knitted fabric in an impregnation device containing desizing and refining solution. The bath ratio is 1:20~1:25, the temperature is 80℃~90℃, and the treatment time is 40min~50min. The desizing and refining solution contains, by weight, 5~8 parts of fatty alcohol polyoxyethylene ether, 3~5 parts of sodium carbonate, 1~2 parts of sodium silicate, and 85~90 parts of deionized water.

[0052] S5. Setting: The knitted fabric after being impregnated with the greige fabric is sent to a pre-shrinking machine for pre-shrinking and setting.

[0053] This invention combines bamboo fiber yarn with silver ion antibacterial masterbatch at high speed, thus combining the natural antibacterial and anti-mite properties of bamboo fiber with the strong broad-spectrum bactericidal ability of silver ions. This results in a knitted fabric with excellent and long-lasting dual antibacterial effect. The silver ion masterbatch is evenly integrated with the fiber during the mixing stage. Compared with the finishing coating, it has stronger water resistance and can effectively inhibit bacterial growth, keeping the fabric clean and hygienic.

[0054] To address the issues of poor moisture absorption and static electricity generation in ordinary polyester fibers, this invention employs polyethylene glycol (PEG) as the modifier solution in step S2. This modifier is used to impregnate and heat-treat low-elasticity polyester profiled yarns. The hydrophilic groups in the PEG molecules effectively improve the hydrophilicity of the polyester surface. Combined with the moisture-wicking groove effect of the profiled yarn cross-section and the excellent moisture absorption and breathability of cotton blended yarns and bamboo fiber yarns, the finished fabric combines the quick-drying properties of chemical fibers with the skin-friendly feel of natural fibers. This solves the problem of stuffiness and lack of breathability in traditional polyester blended fabrics, making them more comfortable and dry to wear.

[0055] The fabric is woven using a double-sided weft knitting machine, combined with the pre-shrinking and setting treatment in step S5, resulting in a tight fabric structure, good dimensional stability, and resistance to deformation or curling. Polyester low-elasticity yarn provides the fabric with good elastic recovery and wrinkle resistance, while the addition of cotton blended yarn and bamboo fiber yarn balances the hand feel, making the fabric both crisp and drapey. Step S4 uses a specific desizing and refining liquor formula containing fatty alcohol polyoxyethylene ether, sodium carbonate, and sodium silicate. Fatty alcohol polyoxyethylene ether has excellent wetting, emulsifying, and detergency capabilities. Combined with alkali agents and auxiliaries, it can effectively remove oils, sizing agents, and natural impurities from the yarn surface under mild conditions of 80℃~90℃. This not only improves the absorbency and whiteness of the knitted fabric, laying a good foundation for subsequent processing, but is also gentler and more environmentally friendly than traditional strong alkali processes, reducing damage to fiber strength.

[0056] Example 1:

[0057] A method for preparing a knitted fabric, comprising the above steps S1 to S5 of the present invention, with the following specific parameters: 48 parts by weight of polyester low-elastic profiled yarn (trilobal cross section, 150D), 30 parts by weight of bamboo fiber yarn, 20 parts by weight of cotton blended yarn, and 5 parts by weight of silver ion antibacterial masterbatch (containing 3wt% silver ions).

[0058] S2 uses a 4% polyethylene glycol modifier solution, is impregnated at 65°C for 35 minutes, and silver ion antibacterial masterbatch is mixed with bamboo fiber yarn at 900 r / min for 18 minutes.

[0059] S3 double-sided weft knitting machine has a gauge of 28 needles / inch and a coil length of 29 cm / 100 N.

[0060] S4 desizing and refining solution contains: 6 parts fatty alcohol polyoxyethylene ether, 4 parts sodium carbonate, 1.5 parts sodium silicate, and 88.5 parts deionized water, and is treated at 85°C for 45 minutes.

[0061] Comparative Example 1

[0062] The only difference between this comparative example and Example 1 is that the polyester low-elasticity profiled yarn was not modified, the step of treating the polyester low-elasticity profiled yarn with polyethylene glycol modifier solution in step S2 was omitted, and the untreated polyester low-elasticity profiled yarn was directly used for weaving in step S3.

[0063] Comparative Example 2

[0064] The only difference between this comparative example and Example 1 is that: traditional post-treatment coating antibacterial is used, silver ion antibacterial masterbatch is not added in step S1, and antibacterial masterbatch is not mixed with bamboo fiber in step S2. Instead, after the shaping in step S5, the knitted fabric is immersed in a silver ion antibacterial finishing agent with a mass concentration of 5g / L for post-treatment coating treatment.

[0065] Comparative Example 3

[0066] The only difference between this comparative example and Example 1 is that: traditional strong alkali desizing and refining is used, and the desizing and refining liquid formula in step S4 is replaced with a traditional strong alkali solution (8 parts by weight of sodium hydroxide, 5 parts by weight of hydrogen peroxide, 2 parts by weight of refining agent, and 85 parts by weight of water), the treatment temperature is 100°C, and the treatment time is 45 min.

[0067] To verify the overall performance of the fabric of the present invention, the knitted fabrics obtained in Example 1 and Comparative Examples 1-3 were subjected to the following performance characterization and testing:

[0068] 1. Antibacterial properties and washability test: Referring to GB / T20944.3-2008 "Evaluation of antibacterial properties of textiles - Part 3: Vibration method", the inhibition rates of the fabric against Staphylococcus aureus and Escherichia coli were tested before washing (0 washes) and after 50 standard washes. The washing standard was in accordance with GB / T8629-2017.

[0069] 2. Moisture wicking and quick-drying performance test (capillary effect and breathability):

[0070] Capillary effect: Refer to FZ / T01071-2008 "Test method for capillary effect of textiles" to test the height (mm) of liquid climbing on the fabric within 30 minutes. The larger the value, the better the hydrophilicity and moisture wicking.

[0071] Air permeability: Refer to GB / T5453-1997 "Textiles - Determination of air permeability of fabrics" to test the air permeability (mm / s) of the fabric.

[0072] 3. Antistatic performance test: Refer to GB / T12703.1-2008 "Evaluation of electrostatic properties of textiles - Part 1: Static voltage half-life" to test the static voltage half-life (s) of the fabric. The shorter the time, the better the antistatic ability.

[0073] 4. Strength and bursting performance test: Refer to GB / T19976-2005 "Determination of bursting strength of textiles - steel ball method" to test the bursting strength (N) of the fabric to evaluate the influence of the processing process on the strength of the fabric.

[0074] 5. Dimensional stability test: Refer to GB / T8630-2013 to determine the shrinkage rate (%) of the fabric in the longitudinal (warp / longitudinal) and transverse (weft) directions after washing.

[0075] The test results for each group of fabrics are summarized in Table 1 below:

[0076] Table 1: Results of Comprehensive Performance Tests for Fabrics

[0077]

[0078] The following conclusions can be drawn from the comparison of the data in Table 1:

[0079] Long-lasting antibacterial performance verification: Comparing Example 1 and Comparative Example 2, it can be seen that although the initial antibacterial rate of both is as high as 99% or more, after 50 washes, the antibacterial rate of Comparative Example 2 drops sharply to about 60%, losing its antibacterial function; while Example 1, due to the modification method of physically fusing silver ion masterbatch with bamboo fiber in a high-speed mixer, has silver ions firmly locked in the fiber gaps, and the antibacterial rate still remains above 95% after 50 washes, proving that the present invention has extremely excellent water-resistant and long-lasting antibacterial performance.

[0080] Moisture wicking and antistatic verification: Comparing Example 1 and Comparative Example 1, it can be seen that the capillary effect of Comparative Example 1 is only 85 mm, and the electrostatic half-life is as high as 13.5 s. Example 1, through modification with polyethylene glycol modifier solution, endows the surface of polyester low-elastic profiled yarn with a large number of hydrophilic groups, combined with the moisture-wicking grooves of the trilobal cross section, which increases its capillary effect to 148 mm, significantly improves air permeability, and reduces the electrostatic half-life to 2.1 s. This fully demonstrates that the present invention completely solves the defects of traditional polyester fabrics such as stuffiness and easy static electricity.

[0081] Strength and Hand Feel Protection Verification: Comparing Example 1 and Comparative Example 3, it can be seen that the bursting strength of the fabric treated with traditional high temperature and strong alkali (Comparative Example 3) drops significantly to 320N, and the shrinkage rate increases; while Example 1 uses specific fatty alcohol polyoxyethylene ether and desizing refining solution, and completes the removal of impurities under medium temperature conditions of 80℃-90℃, maintaining a bursting strength of 415N. While ensuring high wicking efficiency, it greatly reduces the damage to the strength of the fiber itself. Combined with double-sided weft knitting and pre-shrinking processes, the fabric shrinkage rate is controlled within 1.5%, and the dimensions are extremely stable.

[0082] The impregnation equipment in step S4 includes an impregnation chamber 1, wherein a feeding rack 2 and a discharging rack 3 are fixedly connected to the front and rear sides of the impregnation chamber 1, respectively. The front and rear sides of the upper surface of the feeding rack 2 and the front and rear sides of the upper surface of the discharging rack 3 are provided with a pressing and feeding mechanism 4 for pressing and conveying the knitted fabric. A beating mechanism 5 for beating and dust removal of the knitted fabric is provided on the feeding rack 2. A dust extraction and drying integrated mechanism 6 is provided between the feeding rack 2 and the discharging rack 3. Several guide rollers 7 are rotatably connected inside the impregnation chamber 1. An anti-deviation mechanism 8 and a scraping mechanism 9 are provided on the impregnation chamber 1.

[0083] The pressing and feeding mechanism 4 includes two first fixed blocks 10 fixed to the surface of the feeding frame 2. A cylinder 11 is fixedly connected to the side of the first fixed block 10. A second fixed block 12 is fixedly connected to the piston rod end of the cylinder 11. Feeding rollers 13 are rotatably connected between the two first fixed blocks 10 and between the two second fixed blocks 12. A guide sleeve 15 is fixedly connected to the side of the first fixed block 10. A guide strip 14 that slides into the guide sleeve 15 is fixedly connected to the side of the second fixed block 12. The first fixed blocks 10 and the second fixed blocks 12 respectively support the upper and lower sets of feeding rollers 13. The cylinder 11 can drive the second fixed block 12 to move along the guiding direction of the guide sleeve 15 and the guide strip 14, thereby adjusting the distance between the two sets of feeding rollers 13 to adapt to knitted fabrics of different thicknesses. The cooperation between the guide sleeve 15 and the guide strip 14 ensures the stability of the movement of the second fixed block 12, avoids the deviation of the feeding rollers 13, realizes the smooth pressing and conveying of the knitted fabric, and prevents feeding slippage or damage to the knitted fabric.

[0084] The striking mechanism 5 includes a first support plate 25 fixed to the inner wall of the feed rack 2. Two first side support plates 16 are fixedly connected to the lower surface of the feed rack 2. A rotating shaft 18 is rotatably connected between the two first side support plates 16. An output shaft is fixedly connected to the side of one of the first side support plates 16, and a first motor 17 is rotatably fixedly connected to it. Several discs 19 are fixedly connected to the outer surface of the rotating shaft 18, and the discs 19 are eccentrically arranged with respect to the rotating shaft 18. Several sliding columns 21 are slidably connected to the first support plate 25. A mating plate 20 that fits against the surface of the disc 19 is fixedly connected to the bottom end of each sliding column 21. A rubber head 22 is fixedly connected to the top end of each sliding column 21. A limiting strip 24 is fixedly connected to the surface. The first support plate 25 is slidably connected to the limiting strip 24 on the outer side of the sliding column 21. A spring 23 is fixedly connected between the first support plate 25 and the mating plate 20. The first motor 17 drives the rotating shaft 18 to rotate. When the eccentrically arranged disc 19 rotates with the rotating shaft 18, it will periodically push the mating plate 20, causing the sliding column 21 to slide up and down along the first support plate 25. The spring 23 provides a restoring elastic force, so that the rubber head 22 at the top of the sliding column 21 continuously hits the surface of the knitted fabric, shaking off the attached dust and lint. The limiting strip 24 restricts the sliding direction of the sliding column 21 to prevent it from deviating. The rubber head 22 can prevent damage to the knitted fabric during the hitting process.

[0085] The integrated dust extraction and drying mechanism 6 includes a second support plate 26 fixed to the inner wall of the feeding rack 2, a dust extraction fan 27 fixed to the lower surface of the second support plate 26, a first conveying pipe 28 fixed to the air inlet of the dust extraction fan 27, a filter 29 disposed at the end of the first conveying pipe 28, a second conveying pipe 30 disposed on the filter 29, a dust extraction hood 31 fixed to the upper surface of the feeding rack 2 and connected to the second conveying pipe 30, a third conveying pipe 32 connected to the air outlet of the dust extraction fan 27, a drying shell 33 fixed to the surface of the discharging rack 3, several hot air output pipes 34 fixed to the upper and lower surfaces of the inner wall of the drying shell 33, and several hot air output nozzles 35 fixed to the hot air output pipes 34. The number of dust extraction hoods 31 is two, and the two dust extraction hoods 31 are arranged opposite each other, one above the other. An installation cylinder 36 is fixedly connected to the outer surface of the third conveying pipe 32. A spiral heating wire 37 is fixedly connected to the inner wall of the installation cylinder 36. Two dust extraction hoods 31 arranged opposite to each other can simultaneously adsorb dust and impurities on the upper and lower surfaces of the knitted fabric. The dust extraction fan 27 forms a negative pressure dust extraction channel through the second conveying pipe 30, the filter 29, and the first conveying pipe 28. The filter 29 filters the dust to prevent contamination of the dust extraction fan 27. When the air discharged by the dust extraction fan 27 is conveyed through the third conveying pipe 32, the spiral heating wire 37 in the installation cylinder 36 heats the air. The heated air is evenly sprayed onto the surface of the knitted fabric through the hot air output pipe 34 and the hot air output nozzle 35, realizing the integrated operation of dust extraction and drying, reducing equipment space occupation, reducing energy consumption, and improving processing efficiency.

[0086] The filter 29 includes a lower housing 38 connected to the first conveying pipe 28, an upper housing 39 connected to the second conveying pipe 30, a filter cylinder 41 disposed inside the lower housing 38, and a cleaning unit 45 for cleaning the filter cylinder 41. The lower housing 38 and the upper housing 39 are connected by a number of bolts 40. The inner wall of the lower housing 38 is fixedly connected to a number of blocking blocks 42. The outer surface of the filter cylinder 41 is fixedly connected to a support ring 43 that fits against the upper surface of the blocking blocks 42. The lower surface of the support ring 43 is fixedly connected to a number of alignment rods 44. The blocking blocks 42 are inserted into the alignment rods 44. The lower housing 38 and the upper housing 39 are detachably connected by bolts 40 for easy maintenance of internal components. The filter cylinder 41 is used to filter dust and impurities. The support ring 43 and the blocking blocks 42 cooperate to position the filter cylinder 41. The alignment rods 44 are inserted into the alignment holes to prevent the filter cylinder 41 from rotating.

[0087] The cleaning unit 45 includes a support frame 46, a second motor 47 fixed on the support frame 46, and a cleaning scraper 48 detachably mounted on the output shaft of the second motor 47. The inner wall of the upper housing 39 has a slot (not marked in the figure) for the end of the support frame 46 to be inserted. The support frame 46 is fitted to the upper surface of the support ring 43. The inner wall of the cleaning scraper 48 is fixedly connected to an assembly sleeve 49 for the output shaft of the second motor 47 to be inserted. An assembly screw 50 is threaded between the assembly sleeve 49 and the output shaft of the second motor 47. An assembly nut 51 is threaded on the outer surface of the assembly screw 50. The second motor 47 drives the cleaning scraper 48 to rotate, which can clean the dust accumulated on the inner wall of the filter screen cylinder 41 and prevent the mesh from being blocked. The cooperation of the assembly sleeve 49, the assembly screw 50 and the assembly nut 51 facilitates the disassembly and replacement of the cleaning scraper 48.

[0088] The anti-deviation mechanism 8 includes two second side support plates 52 fixed to the surface of the impregnation tank 1, a bidirectional screw 54 rotatably connected between the two second side support plates 52, a third motor 53 fixed to the side of one of the second side support plates 52 and whose output shaft is fixedly connected to the bidirectional screw 54, two threaded sleeves 55 respectively threaded to the outer surfaces of the two sections of the thread of the bidirectional screw 54, a connecting frame 56 fixed to the lower surface of the threaded sleeves 55, and several anti-deviation rings 57 fixed to the bottom of the connecting frame 56. The anti-deviation rings 57 are sleeved on the outer surface of the guide roller 7 at the corresponding positions. The third motor 53 drives the bidirectional screw 54 to rotate. Since the two sections of the thread of the bidirectional screw 54 rotate in opposite directions, the two threaded sleeves 55 will move towards or away from each other along the bidirectional screw 54, causing the connecting frame 56 and the anti-deviation rings 57 to move synchronously, thereby adjusting the position of the anti-deviation rings 57 on the guide roller 7 to adapt to knitted fabrics of different widths.

[0089] Several support rods 59 are fixedly connected between the two second side support plates 52. A support sleeve 58 is fixedly connected to the surface of the connecting frame 56 and is slidably sleeved on the surface of the support rods 59. The cooperation between the support rods 59 and the support sleeve 58 ensures the stability of the movement of the connecting frame 56. The anti-deviation ring 57 can limit the conveying trajectory of the knitted fabric blank and prevent it from deviating on the guide roller 7, thus ensuring the consistency of the impregnation treatment.

[0090] The scraping mechanism 9 includes a fixed scraper 60 fixedly connected to the inner wall of the impregnation tank 1, two mounting blocks 62 fixed to the surface of the impregnation tank 1, a fixed shaft 63 rotatably connected between the mounting blocks 62, and a movable scraper 61 fixed to the surface of the fixed shaft 63. The fixed scraper 60 and the movable scraper 61 cooperate to scrape off the residual desizing and refining liquid and impurities on the surface of the knitted fabric.

[0091] A fixing cover 64 is fixedly connected to the side of the mounting block 62. The end of the fixing shaft 63 extends into the interior of the fixing cover 64. A torsion spring 65 is fixedly connected between the outer surface of the end of the fixing cover 64 and the inner wall of the fixing cover 64. The movable scraper 61 is rotatably connected to the mounting block 62 via the fixing shaft 63. The torsion spring 65 inside the fixing cover 64 provides elastic torque to the fixing shaft 63, ensuring that the movable scraper 61 always adheres to the surface of the knitted fabric, adapting to the conveying state of the knitted fabric, improving the scraping effect, and avoiding damage to the knitted fabric from rigid contact. (See reference...) Figure 19 During the drying process of knitted fabrics, especially elastic fabrics, elastic fabrics are very easy to deform. In order to prevent the fabric from being stretched or wrinkled, the feeding roller 13 usually moves up and down to offset the speed difference in real time, ensuring that the knitted fabric enters the drying and shaping process in a relaxed state. During the longitudinal movement of the feeding roller 13, the fabric of the guide roller 7 has a certain height difference after being conveyed to the position of the feeding roller 13. Under the action of the torsion spring 65, the movable scraper 61 can be kept in contact with the fabric surface to scrape off the residual desizing and refining liquid and impurities on the surface of the knitted fabric. At the same time, the knitted fabric can maintain a certain tension and be in contact with the roller 13.

[0092] By combining the beating mechanism 5 with the integrated dust extraction and drying mechanism 6, the dust and impurities inside the knitted fabric are first shaken off by beating, and then the surface impurities are absorbed by the dust extraction hood 31. This dual dust removal ensures the cleanliness of the knitted fabric, laying a good foundation for the subsequent desizing and refining process and improving the surface smoothness of the fabric. The integrated dust extraction and drying mechanism 6 integrates the dust extraction and drying processes, using the airflow of the dust extraction fan 27 to achieve energy recovery, reducing the energy consumption and space occupation of independent equipment. At the same time, hot air is evenly sprayed through multiple sets of hot air output nozzles 35, improving drying efficiency and uniformity. By setting up a pressing and feeding mechanism 4, it can flexibly adapt to knitted fabrics of different thicknesses, ensuring the stability of the conveying process and preventing deviation. Structure 8 effectively prevents the knitted fabric from deviating, ensuring the consistency of the impregnation process and improving the product qualification rate. By setting the anti-deviation mechanism 8, the third motor 53 drives the bidirectional screw 54 to rotate. Since the two threads of the bidirectional screw 54 rotate in opposite directions, the two threaded sleeves 55 will move towards or away from each other along the bidirectional screw 54, driving the connecting frame 56 and the anti-deviation ring 57 to move synchronously, thereby adjusting the position of the anti-deviation ring 57 on the guide roller 7 to adapt to knitted fabrics of different widths. By setting the scraping mechanism 9, the fixed scraper 60 and the elastically fitted movable scraper 61 cooperate to scrape off residual impurities and liquids on the surface of the knitted fabric while avoiding damage to the knitted fabric, ensuring the integrity and quality of the fabric.

[0093] When using:

[0094] First, prepare polyester low-elastic profiled yarn, bamboo fiber yarn, cotton blended yarn and silver ion antibacterial masterbatch according to the formula. Then, modify the polyester low-elastic profiled yarn with polyethylene glycol and modify the bamboo fiber yarn with antibacterial properties to improve the performance and compatibility of the raw materials.

[0095] The modified raw material is fed into a double-sided weft knitting machine and woven according to the set machine number, loop length and weaving speed to form a knitted fabric greige.

[0096] Knitted fabric greige is fed into an impregnation device for processing:

[0097] Feeding stage: The pressing and feeding mechanism 4 on the feeding rack 2 is started, the cylinder 11 drives the second fixed block 12 to move, so that the upper and lower feeding rollers 13 press the knitted fabric blank, and at the same time the feeding rollers 13 rotate to smoothly transport the knitted fabric blank into the feeding rack 2.

[0098] The dust removal stage: The first motor 17 starts and drives the rotating shaft 18 and the disc 19 to rotate. The disc 19 periodically pushes the mating plate 20, which drives the sliding column 21 and the rubber head 22 to move up and down and back and forth, continuously knocking the surface of the knitted fabric and shaking off the dust and lint inside.

[0099] Dust extraction stage: The dust extraction fan 27 is started, and negative pressure is generated through two oppositely arranged dust extraction hoods 31 to adsorb dust and impurities on the upper and lower surfaces of the knitted fabric. The impurities are carried by the airflow through the second conveying pipe 30 into the filter 29. The filter screen cylinder 41 filters and traps the impurities. The support ring 43 and the alignment rod 44 ensure the stability of the filter screen cylinder 41. When the filter screen cylinder 41 has a lot of dust, the second motor 47 is started to drive the cleaning scraper 48 to rotate and clean the inner wall of the filter screen cylinder 41. The cleaned impurities can be removed by disassembling the upper housing 39.

[0100] Impregnation stage: After dust removal, the knitted fabric enters the impregnation chamber 1 and is completely immersed in the desizing and refining liquid by the guidance of the guide roller 7. The desizing and refining process is carried out according to the set temperature, liquor ratio and time. During this process, the anti-deviation mechanism 8 is activated, and the third motor 53 drives the bidirectional screw 54 to rotate, which drives the two threaded sleeves 55 and the connecting frame 56 to move. The position of the anti-deviation ring 57 on the guide roller 7 is adjusted so that the anti-deviation ring 57 fits against the two sides of the knitted fabric, restricting the conveying trajectory of the knitted fabric and preventing deviation. The support rod 59 and the support sleeve 58 ensure that the connecting frame 56 moves smoothly.

[0101] Scraping stage: After the knitted fabric is impregnated, when it is discharged from the guide roller 7, the scraping mechanism 9 starts to work. The fixed scraper 60 and the movable scraper 61 are respectively attached to the two sides of the knitted fabric to scrape off the residual desizing and refining liquid and impurities on the surface. Under the elastic action of the torsion spring 65, the movable scraper 61 always maintains a close contact with the knitted fabric, adapts to the conveying fluctuation of the knitted fabric, and avoids damage caused by rigid contact.

[0102] Drying stage: The knitted fabric enters the drying shell 33 on the discharge rack 3. The air discharged by the dust extraction fan 27 is transported through the third conveying pipe 32. The heating wire 37 in the installation cylinder 36 heats the air. The heated air is distributed to each hot air output nozzle 35 through the hot air output pipe 34 and evenly sprayed on the upper and lower surfaces of the knitted fabric to achieve rapid drying of the knitted fabric.

[0103] After being impregnated, scraped, and dried, the knitted fabric is smoothly output through the pressing and feeding mechanism 4 on the discharge rack 3 and fed into the pre-shrinking machine for pre-shrinking and shaping, ultimately resulting in high-quality knitted fabric.

[0104] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A method for preparing a knitted fabric, characterized in that, Includes the following steps: S1. Raw material preparation, including: 40-55 parts by weight of polyester low-elastic profiled yarn, 25-35 parts by weight of bamboo fiber yarn, 15-25 parts by weight of cotton blended yarn, and 3-8 parts by weight of silver ion antibacterial masterbatch. S2. Raw material modification treatment: The polyester low-elastic profiled yarn prepared in step S1 is immersed in a polyethylene glycol modifier solution with a mass concentration of 3%~5% for 30min~40min at a temperature of 60℃~70℃ and a bath ratio of 1:15~1:

20. After immersion, it is dried at 100℃~110℃ to obtain modified polyester profiled yarn. The silver ion antibacterial masterbatch prepared in step S1 is mixed with bamboo fiber yarn in a high-speed mixer at a mixing speed of 800r / min~1000r / min for 15min~20min to obtain antibacterial bamboo fiber yarn. S3. Weaving: Modified polyester profile yarn, antibacterial bamboo fiber yarn, and cotton blended yarn are fed into a double-sided weft knitting machine according to the ratio for weaving. The machine gauge is set to 28-32 needles, the loop length is 2.8mm-3.2mm, and the weaving speed is 15r / min-20r / min to obtain the knitted fabric greige. S4. Fabric impregnation: The knitted fabric is impregnated in an impregnation device containing a desizing and refining solution. The bath ratio is 1:20 to 1:25, the temperature is 80℃ to 90℃, and the treatment time is 40 min to 50 min. The desizing and refining solution contains, by weight, 5 to 8 parts of fatty alcohol polyoxyethylene ether, 3 to 5 parts of sodium carbonate, 1 to 2 parts of sodium silicate, and 85 to 90 parts of deionized water. S5. Setting: The knitted fabric after being impregnated with the greige fabric is sent to a pre-shrinking machine for pre-shrinking and setting.

2. The method for preparing a knitted fabric according to claim 1, characterized in that: The polyester low-elastic profiled yarn has a trilobal cross-section and a fineness of 150D~200D. The carrier of the silver ion antibacterial masterbatch is polyester resin, and the silver ion content is 2wt%~5wt%.

3. The method for preparing a knitted fabric according to claim 1, characterized in that: The impregnation equipment in step S4 includes an impregnation chamber (1), wherein a feeding rack (2) and a discharging rack (3) are fixedly connected to the front and rear sides of the impregnation chamber (1), and a pressing and feeding mechanism (4) for pressing and conveying the knitted fabric is provided on the front and rear sides of the upper surface of the feeding rack (2) and the front and rear sides of the upper surface of the discharging rack (3), and a beating mechanism (5) for beating and dust removal of the knitted fabric is provided on the feeding rack (2), and a dust extraction and drying integrated mechanism (6) is provided between the feeding rack (2) and the discharging rack (3), and a number of guide rollers (7) are rotatably connected inside the impregnation chamber (1), and an anti-deviation mechanism (8) and a scraping mechanism (9) are provided on the impregnation chamber (1).

4. The method for preparing a knitted fabric according to claim 3, characterized in that: The pressing and feeding mechanism (4) includes two first fixing blocks (10) fixed on the surface of the feed rack (2). A cylinder (11) is fixedly connected to the side of the first fixing block (10). A second fixing block (12) is fixedly connected to the piston rod end of the cylinder (11). Feeding rollers (13) are rotatably connected between the two first fixing blocks (10) and between the two second fixing blocks (12). A guide sleeve (15) is fixedly connected to the side of the first fixing block (10). A guide strip (14) that slides into the guide sleeve (15) is fixedly connected to the side of the second fixing block (12).

5. The method for preparing a knitted fabric according to claim 3, characterized in that: The striking mechanism (5) includes a first support plate (25) fixed to the inner wall of the feed rack (2). Two first side support plates (16) are fixedly connected to the lower surface of the feed rack (2). A rotating shaft (18) is rotatably connected between the two first side support plates (16). An output shaft is fixedly connected to the side of one of the first side support plates (16), and a first motor (17) is rotatably fixedly connected to it. Several discs (19) are fixedly connected to the outer surface of the rotating shaft (18), and the discs (19) are eccentrically arranged with respect to the rotating shaft (18). A plurality of sliding columns (21) are slidably connected on the first support plate (25). The bottom end of the sliding column (21) is fixedly connected to a mating plate (20) that fits and is arranged on the surface of the disc (19). The top end of the sliding column (21) is fixedly connected to a rubber head (22). The outer surface of the sliding column (21) is fixedly connected to a limiting strip (24). The first support plate (25) is slidably connected to the limiting strip (24) on the outer side of the sliding column (21). A spring (23) is fixedly connected between the first support plate (25) and the mating plate (20).

6. The method for preparing a knitted fabric according to claim 3, characterized in that: The integrated dust extraction and drying mechanism (6) includes a second support plate (26) fixed to the inner wall of the feeding rack (2), a dust extraction fan (27) fixed to the lower surface of the second support plate (26), a first conveying pipe (28) fixed to the air inlet of the dust extraction fan (27), a filter (29) set at the end of the first conveying pipe (28), a second conveying pipe (30) set on the filter (29), a dust extraction hood (31) fixed to the upper surface of the feeding rack (2) and connected to the second conveying pipe (30), and a dust extraction fan (27) connected to the air outlet of the dust extraction fan (27). The third conveying pipe (32), the drying shell (33) fixed on the surface of the discharge rack (3), a number of hot air output pipes (34) fixed on the upper and lower surfaces of the inner wall of the drying shell (33), and a number of hot air output nozzles (35) fixed on the hot air output pipes (34). The number of dust hoods (31) is two and the two dust hoods (31) are arranged opposite each other, one above the other. The outer surface of the third conveying pipe (32) is fixedly connected to the mounting cylinder (36), and the inner wall of the mounting cylinder (36) is fixedly connected to the spiral heating wire (37).

7. The method for preparing a knitted fabric according to claim 3, characterized in that: The anti-deviation mechanism (8) includes two second side support plates (52) fixed on the surface of the immersion tank (1), a bidirectional screw (54) rotatably connected between the two second side support plates (52), a third motor (53) fixed on the side of one of the second side support plates (52) and whose output shaft is fixedly connected to the bidirectional screw (54), two threaded sleeves (55) respectively threaded to the outer surfaces of the two sections of the thread of the bidirectional screw (54), a connecting frame (56) fixed on the lower surface of the threaded sleeve (55), and several anti-deviation rings (57) fixed at the bottom of the connecting frame (56). The anti-deviation rings (57) are sleeved on the outer surface of the guide roller (7) at the corresponding position.

8. The method for preparing a knitted fabric according to claim 3, characterized in that: The scraping mechanism (9) includes a fixed scraper (60) fixedly connected to the inner wall of the immersion tank (1), two mounting blocks (62) fixed to the surface of the immersion tank (1), a fixed shaft (63) rotatably connected between the mounting blocks (62), and a movable scraper (61) fixed to the surface of the fixed shaft (63).

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