A double-layer effect polylactic acid weft-knitted fabric and its production method

Abstract

The present invention discloses a double-layer effect polylactic acid weft-knitted fabric and a production method thereof. The double-layer effect polylactic acid weft-knitted fabric is formed by interweaving 75D / 32F fine denier 100% polylactic acid filaments and 75D / 72F fine denier 100% polylactic acid filaments, wherein the yarn weight ratio of the 75D / 32F fine denier 100% polylactic acid filaments to the 75D / 72F fine denier 100% polylactic acid filaments is 48%-50%:50-52%; the double-layer effect polylactic acid weft-knitted fabric is The fabric includes a front side and a back side. The front side is provided with a front coil fabric layer with longitudinal concave and convex stripes, which is woven from 75D / 72F fine denier 100% polylactic acid filaments. The back side is provided with a plain front coil fabric layer, which is woven from 75D / 32F fine denier 100% polylactic acid filaments. The fabric of the present invention has double-sided and double-layer different appearance effects, biodegradable properties, as well as dry and breathable, skin-friendly and anti-allergic, antibacterial and anti-mite, no odor, anti-pilling and good dimensional stability.

Description

Technical Field

[0001] The present invention relates to the technical field of knitted fabrics, in particular to a polylactic acid weft-knitted fabric with a double-layer effect and a production method thereof. Background Art

[0002] In spring and summer, the functionality required of knitted clothing fabrics such as POLO shirts and T-shirts is becoming more and more comprehensive. For example, some fabrics on the market have good wearing comfort properties such as dry touch, breathable and moisture-permeable, some fabrics have various functional properties such as skin-friendly skin care, antibacterial and anti-mite, non-allergenic, anti-ultraviolet, odorless and deodorizing, and flame retardant. There are also some fabrics with natural fiber materials and recycled fiber materials. Green, ecological, healthy and environmentally friendly in the production and processing process is one of the demands and development trends of the current era. Moreover, clothes are the daily necessities that come into contact with our human body for the longest time, and people's lives are inseparable from food, clothing, housing and transportation. Therefore, fabrics with health, environmental protection and comfort are what today's society needs and are an indispensable trend. However, most fabrics on the market cannot have the above-mentioned multiple functions at the same time and cannot meet people's needs.

[0003] In view of this, the inventors have focused on the numerous deficiencies and inconveniences caused by the imperfections of the aforementioned fabrics and their production methods, and have actively researched, improved, and trial-produced the present invention. Summary of the Invention

[0004] The purpose of the present invention is to provide a double-layer effect polylactic acid weft-knitted fabric and a production method thereof. The fabric not only has a special double-sided double-layer effect with different appearance colors and good wearing comfort properties such as dry touch, breathability and moisture permeability, but also has the functions of skin-friendly skin care, antibacterial and anti-mite, non-allergenic, anti-ultraviolet, odorless and deodorizing, and flame retardant, but also has the environmental protection function of natural regeneration; the production method preferably uses 100% polylactic acid through a double-sided interwoven design and a special post-finishing process, and the preparation process is simple.

[0005] In order to achieve the above object, the solution of the present invention is:

[0006] A double-layer effect polylactic acid weft-knitted fabric, the double-layer effect polylactic acid weft-knitted fabric is formed by interweaving 75D / 32F fine denier 100% polylactic acid filaments and 75D / 72F fine denier 100% polylactic acid filaments, the weight ratio of the 75D / 32F fine denier 100% polylactic acid filaments to the 75D / 72F fine denier 100% polylactic acid filaments is 48%-50%:50-52%;

[0007] The double-layer effect polylactic acid weft-knitted fabric includes a fabric body with a front side and a back side, the front side of the fabric body is provided with a front coil fabric layer with longitudinal concave and convex stripes, and the back side of the fabric body is provided with a front coil fabric layer with a plain weave; the front coil fabric layer with longitudinal concave and convex stripes is woven from 75D / 72F fine denier 100% polylactic acid filaments, and the plain weave front coil fabric layer is woven from 75D / 72F fine denier 100% polylactic acid filaments.

[0008] The front coil fabric layer of the longitudinal concave-convex stripes is formed by alternating convex stripes and concave stripes, and the convex stripes have two continuously arranged longitudinal rows of front coils; the concave stripes are formed by alternating first concave stripes and second concave stripes, and the longitudinal rows of the front coils of the first concave stripes are alternately arranged with two rows of loops having a smooth appearance and eight rows of loops having a smooth appearance, interspersed with three rows of tuck loops having a dot-shaped pinhole appearance; the longitudinal rows of the front coils of the second concave stripes are alternately arranged with two rows of loops having a smooth appearance and twelve rows of loops having a dot-shaped pinhole appearance, interspersed with one row of tuck loops having a dot-shaped pinhole appearance.

[0009] The plain weave front coil fabric layer is formed by alternating two double-layer front coil wales of a single-sided knitted plain weft needle structure with two continuous rib-type needle arrangements and one double-layer front coil wale of a single-sided knitted plain weft needle structure.

[0010] The fabric body is a rib-type composite tissue, and the needle arrangement of the rib-type composite tissue is an alternating arrangement of single-needle single-row tuck and single-side loop knitting.

[0011] The double-layer effect polylactic acid weft-knitted fabric has a grammage per square meter of 175-185 g / m 2 .

[0012] A method for producing a double-layer effect polylactic acid weft-knitted fabric includes a knitting and weaving process and a finishing process, wherein the knitting method of the knitting and weaving process is:

[0013] The double-sided circular knitting machine with a rib-type needle arrangement configuration of 3 needle channels of cylinder needles and 1 needle channel of dial needles is used for knitting; wherein, the minimum cycle of a complete organization of the polylactic acid weft-knitted fabric with the double-layer effect is 6 wales × 32 rows, wherein: 6 wales are composed of 3 needle channels of 6 cylinder needles and 1 needle channel of 6 dial needles arranged alternately, and 32 rows are composed of 32 loop systems around the needle cylinder, wherein,

[0014] The arrangement of 6 cylinder needles in a complete group is ABBCBB, and the arrangement of 6 dial needles is AAAAAA, where A represents high heel needle, B represents mid heel needle, and C represents low heel needle.

[0015] The threading pattern of a fully organized 32-way loop forming system is as follows: the 1st, 3rd, 5th, 7th, 9th, 11th, 13th, 15th, 17th, 19th, 21st, 23rd, 25th, 27th, 29th, and 31st lines are threaded with 75D / 72F fine denier 100% polylactic acid filament; the 2nd, 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th, 20th, 22nd, 24th, 26th, 28th, 30th, and 32nd lines are threaded with 75D / 32F fine denier 100% polylactic acid filament;

[0016] The cam configuration of a fully organized 32-way loop system is as follows: cylinder needle A on routes 1, 3, 5, 11, 13, and 15 corresponds to tuck stitches, cylinder needles B and C are inactive, and dial needle A corresponds to loop stitches; cylinder needle C on routes 21 and 27 corresponds to tuck stitches, cylinder needles A and B are inactive, and dial needle A corresponds to loop stitches; cylinder needles A, B, and C on routes 7, 9, 17, 19, 23, 25, 29, and 31 are inactive, and dial needle A corresponds to loop stitches; cylinder needles A, B, and C on routes 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and 32 correspond to loop stitches, and dial needle A is inactive.

[0017] Table 1 is a complete triangle and yarn configuration table

[0018]

[0019]

[0020] Among them: the yarn threading configuration corresponds to: 1 represents 75D / 72F fine denier 100% polylactic acid filament, 2 represents 75D / 32F fine denier 100% polylactic acid filament;

[0021] Triangle configuration symbol description: Indicates that the dial needle is in a circle, "Δ" indicates that the cylinder needle is in a circle, "∩" indicates that the cylinder needle is tucking, and "—" indicates that the dial needle or cylinder needle is not working;

[0022] Among them: the average length of the 75D / 72F fine denier 100% polylactic acid filaments in every 100 coils of the double-layer effect polylactic acid weft-knitted fabric is 24.6-24.8 cm when double-sided tucking and looping are interwoven, and the average length when single-sided looping is 23-23.2 cm; the average length of the 75D / 32F fine denier 100% polylactic acid filaments in every 100 coils of the double-layer effect polylactic acid weft-knitted fabric is 23-23.2 cm.

[0023] The post-finishing process includes: fabric unwinding → sewing → turning over → refining → first washing → dehydration → slitting → pre-setting → sewing → polylactic acid dyeing → reduction washing → acid washing → second washing → cold washing → dehydration → unwinding → finished product setting → rolling → finished product inspection and testing; wherein,

[0024] Refining process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure dual-liquid flow dyeing machine at a bath ratio of 1:10, and start the main pump; inject 0.5% of the fabric weight ratio of TF129K degreasing dilution solution from the dyeing machine's auxiliary tub into the dyeing machine in sequence, the injection time is 5 minutes, and then circulates for 5 minutes; inject 0.5% of the fabric weight ratio of SF-66 bath softener dilution solution and 0.5% of the fabric weight ratio of soda ash dilution solution, the injection time is 2 minutes, and then circulates for 3 minutes; put the fabric in, circulate for 3 minutes, heat to 60℃, increase the temperature by 3℃ per minute, and circulate for 20 minutes; then cool to 40℃ and perform overflow water washing; the overflow water washing is drained when the temperature reaches 30℃;

[0025] Pre-setting process: The pre-setting process is carried out using the Ligen stenter setting machine from Taiwan, China. Clean water is added for padding, and the rolling ratio is controlled at 60-62%. The set temperatures of the first to tenth ovens are: 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃; the oven fan speed is set at 1600 rpm, the vehicle speed is controlled at 20 m / min, and the cloth drop temperature is controlled below 50℃.

[0026] Polylactic acid dyeing process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure dual-liquid flow dyeing machine at a bath ratio of 1:10, and start the main pump; inject 0.5% of the fabric weight ratio of SF-66 bath softener diluted solution into the tub of the dyeing machine from the additional tub of the dyeing machine; after circulating for 3 minutes, put the fabric into the circulating tub; after circulating for 5 minutes, inject 0.024% of the fabric weight ratio of Disperse Fluorescent Yellow 10GG into the dyeing tub, inject 0.08% of the fabric weight ratio of Disperse Blue R-B1 into the dyeing tub, and inject 2.1% of the fabric weight ratio of Disperse Color Blue B-BS into the dyeing tub. After the cycle has run for 5 minutes, a diluted solution of glacial acetic acid (HAC) with a weight ratio of 0.5% to the fabric is injected; after the cycle has run for 3 minutes, a diluted solution of high-temperature leveling agent TF212E with a weight ratio of 1% to the fabric is injected; after the cycle has run for 3 minutes, the dyeing program is started, and after another 5 minutes of cycle, the temperature is raised from room temperature to 80°C at a rate of 2.0°C / min, and kept warm for 5 minutes; the temperature is raised to 110°C at a rate of 1°C / min, and kept warm for 30 minutes; then the temperature is lowered to 100°C at a rate of 1°C / min, and kept warm for 5 minutes; then the temperature is lowered to 80°C at a rate of 1.5°C / min, and a sample is taken for color matching; the liquid is discharged after the color is confirmed;

[0027] Reduction washing process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure dual-liquid flow dyeing machine at a bath ratio of 1:10, start the main pump and the reduction washing program, and inject a 0.8% diluted solution of acid detergent DM1510A and a 1% diluted solution of anti-staining detergent WD into the tub of the dyeing machine from the additional tub of the dyeing machine in sequence; after circulating for 2 minutes, increase the temperature from room temperature to 80°C at a heating rate of 3°C / min and keep it in circulation for 20 minutes; after keeping it in circulation for 20 minutes, wash the overflow to 60°C and drain the liquid;

[0028] Pickling process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure double-liquid flow dyeing machine at a bath ratio of 1:10, and then inject a diluted solution of glacial acetic acid (HAC) with a weight ratio of 0.3% of the fabric; start the main pump to circulate and wash at 60°C for 10 minutes, then drain the liquid;

[0029] Second washing process: Pour cold water into the cylinder of the Yaji L-type high-temperature and high-pressure double-liquid flow dyeing machine according to the bath ratio of 1:10, start the main pump, circulate and wash at 50℃ for 5 minutes, and then drain;

[0030] Cold washing process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure double-liquid flow dyeing machine at a bath ratio of 1:10, start the main pump and the cold washing program, cycle cold washing at room temperature for 5 minutes, then drain the liquid; repeat the second cold washing process once; then take out the cloth;

[0031] Finished product shaping process: Semi-finished products are shaped using a Ligen stenter setting machine from Taiwan. A padding solution is prepared according to a calibrated padding process formula. The weight of the prepared padding solution is calculated and controlled based on the total amount of solution on the fabric after padding and the volume of the padding tank. The padding solution formula is 5g / L 3746B hydrophilic additive and 5g / L DM-3701 hydrophilic additive. 100L of the prepared solution is added to the padding tank of the Ligen stenter setting machine from Taiwan, China, and the padding ratio is controlled at 60-62%. The temperatures of the first to tenth oven sections are set at 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, and 130°C, respectively. The oven fan speed is controlled at 1600 rpm, the machine speed is controlled at 20 m / min, and the cloth drop temperature is controlled below 50°C.

[0032] Compared with the prior art, the double-layered polylactic acid weft-knitted fabric of the present invention has the following advantages:

[0033] 1. The fabric of the present invention has a double-sided double-layer effect: it adopts a single-sided knitting structure design with a ribbed needle arrangement and a structural design in which one of every three needles in the 6-needle cylinder needle is alternately knitted with tuck stitches and knitted with loops, and alternately knitted with idle stitches and knitted with loops, wherein: the single-sided knitting structure design makes the 75D / 32F fine denier 100% polylactic acid filaments completely on one side of the fabric (the back side, the inner layer); the 75D / 72F fine denier 100% polylactic acid filaments completely on the other side of the fabric (the front side, the outer layer); and The structural design, in which one needle among every three needles of the needle cylinder alternately knits by tucking and looping and alternately knits by not working and looping, makes one side of the 75D / 32F fine denier 100% polylactic acid filament only have a plain and smooth appearance; one side of the 75D / 72F fine denier 100% polylactic acid filament shows longitudinal concave and convex stripes in appearance, and the concave stripes are alternately configured with a smooth appearance and a pinhole appearance effect; so that the fabric of the present invention has a double-sided double-layer effect with different raw material properties and different appearance design patterns on both sides;

[0034] 2. The fabric of the present invention is made of 100% polylactic acid material and has 100% biodegradable properties: the weight ratio of the 75D / 32F fine denier 100% polylactic acid filament and the 75D / 72F fine denier 100% polylactic acid filament is 48%-50%: 50-52%. The polylactic acid polyester fiber is made of agricultural products such as corn and sweet potato, which can be 100% biodegraded and returned to the natural environment, which is more environmentally friendly. Moreover, the raw material of the fabric is polylactic acid natural fiber, which has the characteristics of UV resistance, odorless deodorization, and flame retardancy. The fabric adopts a high-density double-sided woven structure to improve the fabric's UV resistance. Line function; in addition, polylactic acid produced by fermentation of plant sugars by lactic acid bacteria has a natural weak acid pH of 6-6.5; which is basically the same as the pH of the human body surface, and has natural skin-friendly, anti-allergic, antibacterial and anti-mite effects; the fabric of the present invention is made of polylactic acid to weave knitted clothing fabrics, which not only has the characteristics of natural regeneration of cotton fiber, skin-friendly and non-allergenic, but also has the characteristics of dryness and unidirectional moisture conduction of polyester filament, and can also take into account the characteristics of antibacterial and anti-mite, anti-ultraviolet, and odorless deodorization; such a fully functional fabric can bring us a comfortable experience while also effectively protecting our human health;

[0035] 3. The fabric of the present invention meets the requirements of low carbon and environmental protection: the maximum dyeing temperature of polylactic acid filament is 110°C, the fixed maximum temperature is 130°C, and the predetermined maximum temperature is 130°C; compared with the maximum dyeing temperature of polyester filament of 130°C, the fixed maximum temperature is 140°C, which is lower, and the predetermined maximum temperature is 180°C; the heating time and heat preservation time of the entire dyeing and finishing process are shorter; the resources consumed are less, and the fabric is more low carbon and environmentally friendly;

[0036] 4. The fabric of the present invention is both breathable and dry, and provides good wearing comfort: the double-layer fabric structure with ribbed needle configuration gives the fabric good dimensional stability; the entire fabric is made of 100% white polylactic acid filaments, giving the fabric a good touch and dry and breathable properties. The pinhole structure design also enhances the fabric's breathability. In addition, the inner layer of the fabric uses 75D / 32F fine denier 100% polylactic acid filaments, and the outer layer uses 75D / 72F fine denier 100% polylactic acid filaments. The difference in F numbers between the inner and outer layers creates larger gaps between the inner layer fibers, making the inner layer gaps even larger. Moisture can be quickly absorbed by the outer layer, and the moisture conduction speed is fast, which has dry and moisture conduction properties.

[0037] 5. The fabric of the present invention has a simple preparation process: the fabric can be woven on a double-sided circular knitting machine with a rib-type needle arrangement of two upper and four lower needles, and the post-finishing process is short, and the fabric has the characteristics of a simple preparation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 Schematic diagram of the front side (outer layer) of the fabric of the present invention having concave-convex stripes and dot-shaped pinhole effects;

[0039] Figure 2 This is a schematic diagram of the front side of the fabric of the present invention, showing that the reverse side (inner layer) has a plain weave appearance;

[0040] Figure 3 This is a front view of the fabric of the present invention;

[0041] Figure 4 This is a schematic diagram of the reverse side of the fabric of the present invention.

[0042] Explanation of symbols

[0043] The front side of the fabric is 10; the back side of the fabric is 20; the raised stripes are 11; the recessed stripes are 12; the row loops are 14 and 16; and the row tuck loops are 13 and 15. DETAILED DESCRIPTION

[0044] In order to further explain the technical solution of the present invention, the present invention is described in detail below through specific embodiments.

[0045] See Figures 1 to 4The present invention discloses a double-layer effect polylactic acid weft-knitted fabric, which is made of 75D / 32F fine denier 100% polylactic acid filaments and 75D / 72F fine denier 100% polylactic acid filaments interwoven, and the weight ratio of the 75D / 32F fine denier 100% polylactic acid filaments to the 75D / 72F fine denier 100% polylactic acid filaments is 48%-50%:50-52%; the double-layer effect polylactic acid weft-knitted fabric includes a fabric body with a front side 10 and a back side 20, and the fabric body has a The front side 10 is provided with a front coil fabric layer with longitudinal concave and convex stripes, and the back side 20 of the fabric body is provided with a plain front coil fabric layer; the front coil fabric layer with longitudinal concave and convex stripes is woven from 75D / 72F fine denier 100% polylactic acid filaments, and the plain front coil fabric layer is woven from 75D / 32F fine denier 100% polylactic acid filaments; the fabric of the present invention has double-sided and double-layer different appearance effects, biodegradable properties, as well as dry and breathable, skin-friendly and anti-allergic, antibacterial and anti-mite, no odor, anti-pilling and good dimensional stability.

[0046] The front coil fabric layer of the longitudinal concave-convex stripes of the present invention is formed by alternating convex stripes 11 and concave stripes 12, wherein the convex stripes 11 have two continuously arranged front coil wales; the concave stripes 12 are formed by alternating first and second concave stripes, wherein the front coil wales of the first concave stripes are alternately arranged with two rows and eight rows of looped coils having a smooth appearance effect 14 and three rows of tucked coils having a dot-like pinhole appearance effect 13; the front coil wales of the second concave stripes are alternately arranged with two rows and twelve rows of looped coils having a smooth appearance effect 16 and one row of tucked coils having a dot-like pinhole appearance effect 15.

[0047] The plain weave front coil fabric layer of the present invention is formed by alternating two double-layer front coil wales of single-sided weft plain stitch structure with two continuous rib-type needle arrangement configurations and one double-layer front coil wale of single-sided weft plain stitch structure.

[0048] The fabric body of the present invention is a rib-type composite tissue, and the needle arrangement of the rib-type composite tissue is an alternating arrangement of single-needle single-row tuck and single-side loop knitting.

[0049] The double-layer effect polylactic acid weft-knitted fabric of the present invention has a grammage per square meter of 175-185 g / m 2 .

[0050] The weight ratio of the 75D / 32F fine denier 100% polylactic acid filament to the 75D / 72F fine denier 100% polylactic acid filament of the present invention is 49%:51%.

[0051] The present invention also discloses a method for producing a double-layer effect polylactic acid weft-knitted fabric, which includes a knitting weaving process and a finishing process, wherein the knitting method of the knitting weaving process is:

[0052] On a double-sided circular knitting machine with a cylinder diameter of 34 inches, a machine gauge of 28 needles / inch, and a total needle count of 2952, a double-sided circular knitting machine with a rib-type needle arrangement configuration of 3 needle channels of cylinder needles and 1 needle channel of dial needles is used for knitting; wherein, the minimum cycle of a complete organization of the polylactic acid weft-knitted fabric with a double-layer effect is 6 wales × 32 rows, wherein: 6 wales are composed of 3 needle channels of 6 cylinder needles and 1 needle channel of 6 dial needles arranged alternately, and 32 rows are composed of 32 loop systems around the needle cylinder, wherein,

[0053] The arrangement of 6 cylinder needles in a complete group is ABBCBB, and the arrangement of 6 dial needles is AAAAAA, where A represents high heel needle, B represents mid heel needle, and C represents low heel needle.

[0054] The threading pattern of a fully organized 32-way loop forming system is as follows: the 1st, 3rd, 5th, 7th, 9th, 11th, 13th, 15th, 17th, 19th, 21st, 23rd, 25th, 27th, 29th, and 31st lines are threaded with 75D / 72F fine denier 100% polylactic acid filament; the 2nd, 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th, 20th, 22nd, 24th, 26th, 28th, 30th, and 32nd lines are threaded with 75D / 32F fine denier 100% polylactic acid filament;

[0055] The cam configuration of a fully organized 32-way loop system is as follows: cylinder needle A on routes 1, 3, 5, 11, 13, and 15 corresponds to tuck stitches, cylinder needles B and C are inactive, and dial needle A corresponds to loop stitches; cylinder needle C on routes 21 and 27 corresponds to tuck stitches, cylinder needles A and B are inactive, and dial needle A corresponds to loop stitches; cylinder needles A, B, and C on routes 7, 9, 17, 19, 23, 25, 29, and 31 are inactive, and dial needle A corresponds to loop stitches; cylinder needles A, B, and C on routes 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and 32 correspond to loop stitches, and dial needle A is inactive.

[0056] Table 1 is a complete triangle and yarn configuration table

[0057]

[0058]

[0059] Among them: the yarn threading configuration corresponds to: 1 represents 75D / 72F fine denier 100% polylactic acid filament, 2 represents 75D / 32F fine denier 100% polylactic acid filament;

[0060] Triangle configuration symbol description: Indicates that the dial needle is in a circle, "Δ" indicates that the cylinder needle is in a circle, "∩" indicates that the cylinder needle is tucking, and "—" indicates that the dial needle or cylinder needle is not working;

[0061] Among them: the average length of the 75D / 72F fine denier 100% polylactic acid filaments in every 100 coils of the double-layer effect polylactic acid weft-knitted fabric is 24.6-24.8 cm when double-sided tucking and looping are interwoven, and the average length when single-sided looping is 23-23.2 cm; the average length of the 75D / 32F fine denier 100% polylactic acid filaments in every 100 coils of the double-layer effect polylactic acid weft-knitted fabric is 23-23.2 cm.

[0062] The blank fabric of the fabric of the present invention has a horizontal density of 63-64 coil wales / 5cm, a vertical density of 100-101 coil rows / 5cm, and a grammage of 100-105g / m2. 2 The width of the lower machine door is 232cm.

[0063] The post-finishing process includes: fabric unwinding → sewing → turning over → refining → first washing → dehydration → slitting → pre-setting → sewing → polylactic acid dyeing → reduction washing → acid washing → second washing → cold washing → dehydration → unwinding → finished product setting → rolling → finished product inspection and testing; wherein,

[0064] Refining process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure dual-liquid flow dyeing machine at a bath ratio of 1:10, and start the main pump; inject 0.5% of the fabric weight ratio of TF129K degreasing dilution solution from the dyeing machine's auxiliary tub into the dyeing machine in sequence, the injection time is 5 minutes, and then circulates for 5 minutes; inject 0.5% of the fabric weight ratio of SF-66 bath softener dilution solution and 0.5% of the fabric weight ratio of soda ash dilution solution, the injection time is 2 minutes, and then circulates for 3 minutes; put the fabric in, circulate for 3 minutes, heat to 60℃, increase the temperature by 3℃ per minute, and circulate for 20 minutes; then cool to 40℃ and perform overflow water washing; the overflow water washing is drained when the temperature reaches 30℃;

[0065] Pre-setting process: The pre-setting process is carried out using the Ligen stenter setting machine from Taiwan, China. Clean water is added for padding, and the rolling ratio is controlled at 60-62%. The set temperatures of the first to tenth ovens are: 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃; the oven fan speed is set at 1600 rpm, the vehicle speed is controlled at 20 m / min, and the cloth drop temperature is controlled below 50℃.

[0066] Dyeing process for polylactic acid: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure dual-liquid flow dyeing machine at a bath ratio of 1:10, and start the main pump; inject 0.5% of the fabric weight ratio of SF-66 bath softener diluted solution into the tub of the dyeing machine from the additional tub of the dyeing machine; after circulating for 3 minutes, put the fabric into the circulating tub; after circulating for 5 minutes, inject 0.024% of the fabric weight ratio of Disperse Fluorescent Yellow 10GG into the dyeing tub, inject 0.08% of the fabric weight ratio of Disperse Blue R-B1 into the dyeing tub, and inject 2.1% of the fabric weight ratio of Disperse Color Blue B-BS into the dyeing tub. After the cycle has run for 5 minutes, a diluted solution of glacial acetic acid (HAC) with a weight ratio of 0.5% to the fabric is injected; after the cycle has run for 3 minutes, a diluted solution of high-temperature leveling agent TF212E with a weight ratio of 1% to the fabric is injected; after the cycle has run for 3 minutes, the dyeing program is started, and after another 5 minutes of cycle, the temperature is raised from room temperature to 80°C at a rate of 2.0°C / min, and kept warm for 5 minutes; the temperature is raised to 110°C at a rate of 1°C / min, and kept warm for 30 minutes; then the temperature is lowered to 100°C at a rate of 1°C / min, and kept warm for 5 minutes; then the temperature is lowered to 80°C at a rate of 1.5°C / min, and a sample is taken for color matching; the liquid is discharged after the color is confirmed;

[0067] Reduction washing process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure dual-liquid flow dyeing machine at a bath ratio of 1:10, start the main pump and the reduction washing program, and inject a 0.8% diluted solution of acid detergent DM1510A and a 1% diluted solution of anti-staining detergent WD into the tub of the dyeing machine from the additional tub of the dyeing machine in sequence; after circulating for 2 minutes, increase the temperature from room temperature to 80°C at a heating rate of 3°C / min and keep it in circulation for 20 minutes; after keeping it in circulation for 20 minutes, wash the overflow to 60°C and drain the liquid;

[0068] Pickling process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure double-liquid flow dyeing machine at a bath ratio of 1:10, and then inject a diluted solution of glacial acetic acid (HAC) with a weight ratio of 0.3% of the fabric; start the main pump to circulate and wash at 60°C for 10 minutes, then drain the liquid;

[0069] Second washing process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure double-liquid flow dyeing machine at a bath ratio of 1:10, start the main pump, and circulate the water at 50°C for 5 minutes before draining;

[0070] Cold washing process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure double-liquid flow dyeing machine according to the bath ratio of 1:10, start the main pump and the cold washing program, circulate cold washing at room temperature for 5 minutes and then drain the liquid; repeat the second cold washing process once; then take out the cloth.

[0071] Finished product shaping process: Semi-finished products are shaped using a Ligen stenter setting machine from Taiwan. A padding solution is prepared according to a calibrated padding process formula. The weight of the prepared padding solution is calculated and controlled based on the total amount of solution on the fabric after padding and the volume of the padding tank. The padding solution formula is 5g / L 3746B hydrophilic additive and 5g / L DM-3701 hydrophilic additive. 100L of the prepared solution is added to the padding tank of the Ligen stenter setting machine from Taiwan, China, and the padding ratio is controlled at 60-62%. The temperatures of the first to tenth oven sections are set at 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, and 130°C, respectively. The oven fan speed is controlled at 1600 rpm, the machine speed is controlled at 20 m / min, and the cloth drop temperature is controlled below 50°C.

[0072] The width and weight of the finished product are controlled according to the required width and weight of the finished product, and the other processes are the same as the conventional process; the width of the obtained light grey cloth is 150cm, and the weight of the fabric per square meter is 175-185g / m 2 .

[0073] Compared with the prior art, the double-layered polylactic acid weft-knitted fabric of the present invention has the following advantages:

[0074] 1. The fabric of the present invention has a double-sided double-layer effect: it adopts a single-sided knitting structure design with a ribbed needle arrangement and a structural design in which one of every three needles in the 6-needle cylinder needle is alternately knitted with tuck stitches and knitted with loops, and alternately knitted with idle stitches and knitted with loops, wherein: the single-sided knitting structure design makes the 75D / 32F fine denier 100% polylactic acid filaments completely on one side of the fabric (the back side, the inner layer); the 75D / 72F fine denier 100% polylactic acid filaments completely on the other side of the fabric (the front side, the outer layer); and The structural design, in which one needle among every three needles of the needle cylinder alternately knits by tucking and looping and alternately knits by not working and looping, makes one side of the 75D / 32F fine denier 100% polylactic acid filament only have a plain and smooth appearance; one side of the 75D / 72F fine denier 100% polylactic acid filament shows longitudinal concave and convex stripes in appearance, and the concave stripes are alternately configured with a smooth appearance and a pinhole appearance effect; so that the fabric of the present invention has a double-sided double-layer effect with different raw material properties and different appearance design patterns on both sides;

[0075] 2. The fabric of the present invention is made of 100% polylactic acid material and has 100% biodegradable properties: the weight ratio of the 75D / 32F fine denier 100% polylactic acid filament and the 75D / 72F fine denier 100% polylactic acid filament is 48%-50%: 50-52%. The polylactic acid polyester fiber is made of agricultural products such as corn and sweet potato, which can be 100% biodegraded and returned to the natural environment, which is more environmentally friendly. Moreover, the raw material of the fabric is polylactic acid natural fiber, which has the characteristics of UV resistance, odorless deodorization, and flame retardancy. The fabric adopts a high-density double-sided woven structure to improve the fabric's UV resistance. Line function; in addition, polylactic acid produced by fermentation of plant sugars by lactic acid bacteria has a natural weak acid pH of 6-6.5; which is basically the same as the pH of the human body surface, and has natural skin-friendly, anti-allergic, antibacterial and anti-mite effects; the fabric of the present invention is made of polylactic acid to weave knitted clothing fabrics, which not only has the characteristics of natural regeneration of cotton fiber, skin-friendly and non-allergenic, but also has the characteristics of dryness and unidirectional moisture conduction of polyester filament, and can also take into account the characteristics of antibacterial and anti-mite, anti-ultraviolet, and odorless deodorization; such a fully functional fabric can bring us a comfortable experience while also effectively protecting our human health;

[0076] 3. The fabric of the present invention meets the requirements of low carbon and environmental protection: the maximum dyeing temperature of polylactic acid filament is 110°C, the fixed maximum temperature is 130°C, and the predetermined maximum temperature is 130°C; compared with the maximum dyeing temperature of polyester filament of 130°C, the fixed maximum temperature is 140°C, which is lower, and the predetermined maximum temperature is 180°C; the heating time and heat preservation time of the entire dyeing and finishing process are shorter; the resources consumed are less, and the fabric is more low carbon and environmentally friendly;

[0077] 4. The fabric of the present invention is both breathable and dry, and provides good wearing comfort: the double-layer fabric structure with ribbed needle configuration gives the fabric good dimensional stability; the entire fabric is made of 100% white polylactic acid filaments, giving the fabric a good touch and dry and breathable properties. The pinhole structure design also enhances the fabric's breathability. In addition, the inner layer of the fabric uses 75D / 32F fine denier 100% polylactic acid filaments, and the outer layer uses 75D / 72F fine denier 100% polylactic acid filaments. The difference in F numbers between the inner and outer layers creates larger gaps between the inner layer fibers, making the inner layer gaps even larger. Moisture can be quickly absorbed by the outer layer, and the moisture conduction speed is fast, which has dry and moisture conduction properties.

[0078] 5. The fabric of the present invention has a simple preparation process: the fabric can be woven on a double-sided circular knitting machine with a rib-type needle arrangement of two upper and four lower needles, and the post-finishing process is short, and the fabric has the characteristics of a simple preparation process.

[0079] The polylactic acid weft-knitted fabric with a double-layer effect produced by the above method is left to stand for 48 hours under standard conditions, and then tested for its moisture absorption and quick-drying properties according to the standards. The corresponding standards and test results are shown in Table 2.

[0080] Table 2 Fabric performance test results

[0081]

[0082]

[0083] The above embodiments and drawings do not limit the product form and style of the present invention. Any appropriate changes or modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A method for producing a double-layer effect polylactic acid weft-knitted fabric, characterized in that: It includes a knitting and weaving process and a finishing process, wherein the knitting method of the knitting and weaving process is: The double-sided circular knitting machine with a rib-type needle arrangement configuration of 3 needle channels of cylinder needles and 1 needle channel of dial needles is used for knitting; wherein, the minimum cycle of a complete organization of the polylactic acid weft-knitted fabric with the double-layer effect is 6 wales × 32 rows, wherein: 6 wales are composed of 3 needle channels of 6 cylinder needles and 1 needle channel of 6 dial needles arranged alternately, and 32 rows are composed of 32 loop systems around the needle cylinder, wherein, The arrangement of 6 cylinder needles in a complete group is ABBCBB, and the arrangement of 6 dial needles is AAAAAA, where A represents high heel needle, B represents mid heel needle, and C represents low heel needle. The threading pattern of a fully organized 32-way loop forming system is as follows: the 1st, 3rd, 5th, 7th, 9th, 11th, 13th, 15th, 17th, 19th, 21st, 23rd, 25th, 27th, 29th, and 31st lines are threaded with 75D / 72F fine denier 100% polylactic acid filament; the 2nd, 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th, 20th, 22nd, 24th, 26th, 28th, 30th, and 32nd lines are threaded with 75D / 32F fine denier 100% polylactic acid filament; The cam configuration of a fully organized 32-way loop system is as follows: cylinder needle A on routes 1, 3, 5, 11, 13, and 15 corresponds to tuck stitches, cylinder needles B and C are inactive, and dial needle A corresponds to loop stitches; cylinder needle C on routes 21 and 27 corresponds to tuck stitches, cylinder needles A and B are inactive, and dial needle A corresponds to loop stitches; cylinder needles A, B, and C on routes 7, 9, 17, 19, 23, 25, 29, and 31 are inactive, and dial needle A corresponds to loop stitches; cylinder needles A, B, and C on routes 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, and 32 correspond to loop stitches, and dial needle A is inactive. Table 1 is a complete triangle and yarn configuration table Among them: the yarn threading configuration corresponds to: 1 represents 75D / 72F fine denier 100% polylactic acid filament, 2 represents 75D / 32F fine denier 100% polylactic acid filament; Triangle configuration symbol description: "Δ" indicates that the dial needle is in a circle, "∩" indicates that the cylinder needle is in a circle, and "—" indicates that the dial needle or cylinder needle is not working. Among them: the average length of the 75D / 72F fine denier 100% polylactic acid filaments in every 100 coils of the double-layer effect polylactic acid weft-knitted fabric is 24.6-24.8 cm when double-sided tucking and looping are interwoven, and the average length when single-sided looping is 23-23.2 cm; the average length of the 75D / 32F fine denier 100% polylactic acid filaments in every 100 coils of the double-layer effect polylactic acid weft-knitted fabric is 23-23.2 cm.

2. The method for producing a double-layered polylactic acid weft-knitted fabric according to claim 1, characterized in that: The post-finishing process includes: fabric unwinding → sewing → turning over → refining → first washing → dehydration → slitting → pre-setting → sewing → polylactic acid dyeing → reduction washing → acid washing → second washing → cold washing → dehydration → unwinding → finished product setting → rolling → finished product inspection and testing; wherein, Refining process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure dual-liquid flow dyeing machine at a bath ratio of 1:10, and start the main pump; inject 0.5% of the fabric weight ratio of TF129K degreasing dilution solution from the dyeing machine's auxiliary tub into the dyeing machine in sequence, the injection time is 5 minutes, and then circulates for 5 minutes; inject 0.5% of the fabric weight ratio of SF-66 bath softener dilution solution and 0.5% of the fabric weight ratio of soda ash dilution solution, the injection time is 2 minutes, and then circulates for 3 minutes; put the fabric in, circulate for 3 minutes, heat to 60℃, increase the temperature by 3℃ per minute, and circulate for 20 minutes; then cool to 40℃ and perform overflow water washing; the overflow water washing is drained when the temperature reaches 30℃; Pre-setting process: A stenter setting machine is used for pre-setting processing, and padding water is added to control the rolling ratio to 60-62%. The set temperatures of the first to tenth ovens are: 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃, 130℃; the oven fan speed is set to 1600 rpm, the vehicle speed is controlled at 20 m / min, and the cloth drop temperature is controlled below 50℃; Dyeing process for polylactic acid: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure dual-liquid flow dyeing machine at a bath ratio of 1:10, and start the main pump; inject 0.5% of the fabric weight ratio of SF-66 bath softener diluted solution into the tub of the dyeing machine from the additional tub of the dyeing machine; after circulating for 3 minutes, put the fabric into the circulating tub; after circulating for 5 minutes, inject 0.024% of the fabric weight ratio of Disperse Fluorescent Yellow 10GG into the dyeing tub, inject 0.08% of the fabric weight ratio of Disperse Blue R-B1 into the dyeing tub, and inject 2.1% of the fabric weight ratio of Disperse Color Blue B-BS into the dyeing tub. After the cycle has run for 5 minutes, a diluted solution of glacial acetic acid (HAC) with a weight ratio of 0.5% to the fabric is injected; after the cycle has run for 3 minutes, a diluted solution of high-temperature leveling agent TF212E with a weight ratio of 1% to the fabric is injected; after the cycle has run for 3 minutes, the dyeing program is started, and after another 5 minutes of cycle, the temperature is raised from room temperature to 80°C at a rate of 2.0°C / min, and kept warm for 5 minutes; the temperature is raised to 110°C at a rate of 1°C / min, and kept warm for 30 minutes; then the temperature is lowered to 100°C at a rate of 1°C / min, and kept warm for 5 minutes; then the temperature is lowered to 80°C at a rate of 1.5°C / min, and a sample is taken for color matching; the liquid is discharged after the color is confirmed; Reduction washing process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure dual-liquid flow dyeing machine at a bath ratio of 1:10, start the main pump and the reduction washing program, and inject a 0.8% diluted solution of acid detergent DM1510A and a 1% diluted solution of anti-staining detergent WD into the tub of the dyeing machine from the additional tub of the dyeing machine in sequence; after circulating for 2 minutes, increase the temperature from room temperature to 80°C at a heating rate of 3°C / min and keep it in circulation for 20 minutes; after keeping it in circulation for 20 minutes, wash the overflow to 60°C and drain the liquid; Pickling process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure double-liquid flow dyeing machine at a bath ratio of 1:10, and then inject a diluted solution of glacial acetic acid (HAC) with a weight ratio of 0.3% of the fabric; start the main pump to circulate and wash at 60°C for 10 minutes, then drain the liquid; Second washing process: Pour cold water into the cylinder of the Yaji L-type high-temperature and high-pressure double-liquid flow dyeing machine according to the bath ratio of 1:10, start the main pump, circulate and wash at 50℃ for 5 minutes, and then drain; Cold washing process: Pour cold water into the tub of the Yaji L-type high-temperature and high-pressure double-liquid flow dyeing machine at a bath ratio of 1:10, start the main pump and the cold washing program, cycle cold washing at room temperature for 5 minutes, then drain the liquid; repeat the second cold washing process once; then take out the cloth; Finished product shaping process: A stenter setting machine is used to shape the semi-finished product. A padding solution is prepared according to the calibrated padding process formula. The weight of the prepared padding solution is calculated and controlled based on the total amount of solution on the fabric after padding and the volume of the padding tank. The padding solution formula is: 5g / L 3746B hydrophilic additive and 5g / L DM-3701 hydrophilic additive. 100L of the prepared solution is added to the padding tank of the stenter setting machine, and the padding ratio is controlled at 60-62%. The temperatures of the first to tenth oven sections are set at 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, 130°C, and 130°C, respectively. The oven fan speed is controlled at 1600 rpm, the machine speed is controlled at 20 m / min, and the cloth drop temperature is controlled below 50°C.

3. A double-layer effect polylactic acid weft-knitted fabric, characterized by: A fabric produced by the production method of a double-layer effect polylactic acid weft-knitted fabric according to claim 1 or 2, wherein the double-layer effect polylactic acid weft-knitted fabric is interwoven with 75D / 32F fine denier 100% polylactic acid filaments and 75D / 72F fine denier 100% polylactic acid filaments, and the weight ratio of the 75D / 32F fine denier 100% polylactic acid filaments to the 75D / 72F fine denier 100% polylactic acid filaments is 48%-50%:50-52%; The double-layer effect polylactic acid weft-knitted fabric includes a fabric body with a front side and a back side, the front side of the fabric body is provided with a front coil fabric layer with longitudinal concave and convex stripes, and the back side of the fabric body is provided with a front coil fabric layer with a plain weave; the front coil fabric layer with longitudinal concave and convex stripes is woven from 75D / 72F fine denier 100% polylactic acid filaments, and the plain weave front coil fabric layer is woven from 75D / 32F fine denier 100% polylactic acid filaments.

4. The double-layered polylactic acid weft-knitted fabric according to claim 3, characterized in that: The front coil fabric layer of the longitudinal concave-convex stripes is formed by alternating convex stripes and concave stripes, and the convex stripes have two continuously arranged longitudinal rows of front coils; the concave stripes are formed by alternating first concave stripes and second concave stripes, and the longitudinal rows of the front coils of the first concave stripes are alternately arranged with two rows of loops having a smooth appearance and eight rows of loops having a smooth appearance, interspersed with three rows of tuck loops having a dot-shaped pinhole appearance; the longitudinal rows of the front coils of the second concave stripes are alternately arranged with two rows of loops having a smooth appearance and twelve rows of loops having a dot-shaped pinhole appearance, interspersed with one row of tuck loops having a dot-shaped pinhole appearance.

5. The double-layered polylactic acid weft-knitted fabric according to claim 3, characterized in that: The plain weave front coil fabric layer is formed by alternating two double-layer front coil wales of a single-sided knitted plain weft needle structure with two continuous rib-type needle arrangements and one double-layer front coil wale of a single-sided knitted plain weft needle structure.

6. The double-layered polylactic acid weft-knitted fabric according to claim 3, characterized in that: The fabric body is a rib-type composite tissue, and the needle arrangement of the rib-type composite tissue is an alternating arrangement of single-needle single-row tuck and single-side loop knitting.

7. The double-layered polylactic acid weft-knitted fabric according to claim 3, characterized in that: The double-layer effect polylactic acid weft-knitted fabric has a grammage per square meter of 175-185 g / m 2 .

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