Lactic acid hemp zanthoxylum fabric and manufacturing process thereof

Abstract

The invention belongs to the technical field of fabric spinning, and particularly relates to a lactic acid hemp shinyi fabric and a manufacturing process thereof.The fabric comprises, by mass, 40%-50% of blended yarn, 30%-35% of polylactic acid filaments and 15%-25% of low-temperature spandex; wherein the blended yarn is prepared from, by mass, 10%-15% of ramie fibers and 85%-90% of lyocell fibers through a siro compact spinning winder; the manufacturing process comprises a blended yarn preparation step, a yarn preparation step, a gray cloth weaving step, a gray cloth dyeing and finishing step and a finished product warehousing step, and the gray cloth dyeing and finishing step comprises a segmented gray cloth fixing step, a cooling treatment step and a controllable hydrolysis dyeing step. According to the invention, the lyocell blended yarns are matched with the polylactic acid filaments, so that the performance advantages of the material are extended; and through segmented blank fixing and dyeing processes, the softness of polylactic acid is maintained, and the itching of ramie is also reduced under a low-temperature condition.

Description

Technical Field

[0001] The present invention belongs to the technical field of fabric production, and particularly relates to a lactic acid ramie two-sided fabric and its production process. Background Art

[0002] With the progress of global technology and the improvement of environmental protection awareness, polylactic acid (PLA) fabric is a new type of environmentally friendly fiber emerging in the textile industry in recent years. It is a natural material that can replace traditional synthetic fibers and reduce environmental pollution. It has biodegradable properties and can decompose rapidly in the natural environment without causing pollution to the environment, becoming a more environmentally friendly material.

[0003] Ramie fiber, as an excellent natural textile yarn, has a natural slub appearance and functions such as temperature regulation, moisture absorption and ventilation, anti-allergy, anti-static, antibacterial and environmental protection. Its finished products belong to mid- to high-end products.

[0004] When ramie fiber and polylactic acid fiber are used in combination, the application of the two materials is extended. Polylactic acid (PLA) fiber has high crystallinity, high hardness, poor fracture and strength properties, and causes relatively large damage to machines and wear to needle hooks. Ramie fiber has uneven yarn evenness and is relatively hard, making weaving difficult and causing relatively large damage to machines. Moreover, linen products are prone to wrinkling, not easy to care for, prone to itching, and the fabric has insufficient softness, affecting the wearing comfort. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a lactic acid ramie two-sided fabric and its production process.

[0006] In order to achieve the purpose of the present invention, the following technical solutions are adopted for implementation.

[0007] A lactic acid ramie two-sided fabric includes blended yarn with a mass percentage of 40 - 50%, polylactic acid filament with a mass percentage of 30 - 35%, and low-temperature spandex with a mass percentage of 15 - 25%; wherein: the blended yarn is prepared by a siro compact spinning frame from ramie fiber with a mass percentage of 10 - 15% and lyocell fiber with a mass percentage of 85 - 90%.

[0008] As a preferred embodiment of the present invention, the fabric preferably includes blended yarn with a mass percentage of 46.5%, polylactic acid filament with a mass percentage of 33.2%, and low-temperature spandex with a mass percentage of 20.3%; the blended yarn is prepared by a siro compact spinning frame from ramie fiber with a mass percentage of 13% and lyocell fiber with a mass percentage of 87%.

[0009] A production process of a lactic acid ramie two-sided fabric includes the following steps:

[0010] S1. Blended Yarn Preparation: It is prepared by using ramie fibers with a mass percentage of 10 - 15% and lyocell fibers with a mass percentage of 85 - 90% through a siro compact spinning frame.

[0011] S2. Yarn Preparation: Prepare blended yarn A prepared in step S1 with a mass percentage of 40 - 50%, polylactic acid filament B with a mass percentage of 30 - 35%, and low-temperature spandex C with a mass percentage of 15 - 25%.

[0012] S3. Grey Fabric Weaving: Weave the yarn prepared in step S2 on a circular knitting machine; among them: the process conditions of the grey fabric weaving are shown in Table 1.

[0013] S4. Grey Fabric Dyeing and Finishing: It includes sectional setting of the grey fabric and controllable hydrolysis dyeing, among which:

[0014] Sectional Setting of the Grey Fabric: Carry out the setting operation on the grey fabric woven through step S3 through a continuously set drying zone, rapid setting zone, and slow cooling zone; among them: the temperature of the drying zone is 120 - 130°C, the error is controlled within the range of ±5°C, the residence time does not exceed 84 seconds, and the wind speed is 1 - 2 m / s; the temperature of the rapid setting zone is 145 - 155°C, the error is controlled within the range of ±5°C, the residence time does not exceed 12 seconds, and the wind speed is 1.5 - 2.5 m / s; the temperature of the slow cooling zone is 125 - 135°C, the error is controlled within the range of ±5°C, the residence time does not exceed 8 seconds, and the wind speed is 0.5 - 1.0 m / s.

[0015] Controllable Hydrolysis Dyeing: Carry out the dyeing operation on the fabric after sectional setting of the grey fabric. The dyeing process indexes: the hydrolysis rate of the polylactic acid filament is controlled at 0.5% - 1.2%, the dyeing temperature is controlled below 80°C, the dyeing time is 30 min, the dye adsorption amount of the polylactic acid filament should reach 82 mg / g, and the dye adsorption amount of the low-temperature spandex should reach 15 mg / g; among them: the hydrolysis rate of 0.5% - 1.2% of the polylactic acid filament is obtained by controlling the pH value of the dye at 2.8 - 3.0.

[0016] S5. Finished Product Storage: Carry out index detection on the finished fabric after dyeing and finishing through step S4. After passing the detection, it is inspected according to the 4-point system standard. After passing the inspection, the finished product is stored in the warehouse.

[0017] As a preferred scheme of the present invention, during the dyeing operation, 0.5 - 1.2 g / L of polydimethylsiloxane heat stabilizer and 1.5 - 2.5 g / L of anionic anti-staining agent are added to the dye.

[0018] As a preferred scheme of the present invention, the sectional setting of the grey fabric uses a 9-chamber setting machine, gas heating, and the machine speed is 18 m / min. Among them, the 1st to 7th chambers are the drying zone, the 8th chamber is the rapid setting zone, and the 9th chamber is the slow cooling zone.

[0019] As a preferred embodiment of the present invention, the air volume of the air cooler in the cooling box is 3000m 3 / h, and the cooling rate is: it takes 15 seconds to drop from 80°C to 30°C.

[0020] As a preferred embodiment of the present invention, the embryo cloth weaving includes needle arrangement → triangular typesetting → covering the triangular seat → hanging the polylactic acid filament on the yarn rack → threading the yarn to the yarn feeder and the yarn nozzle → hanging the spandex on the spandex rack → yarn hanging on the needle → starting the machine and adjusting the conveying disc.

[0021] As a preferred embodiment of the present invention, the spandex is weighted by spandex rollers to prevent left - right lateral movement or jumping.

[0022] As a preferred embodiment of the present invention, the circular knitting machine is a two - track dense - needle double - sided type, with a 34 - inch needle cylinder, 28 needles arranged per inch, using two types of high and low needle heels with a thickness of 41 deniers. According to 2 needles per cycle, the upper high - heel needles and the lower low - heel needles are opposite, and the upper low - heel needles and the lower high - heel needles are opposite. A circle of triangular seats is installed at the top and side of the needle cylinder respectively, with every 6 triangular seats as a cycle, and there are high and low heel needle tracks in each triangular seat.

[0023] Beneficial effects

[0024] The present invention uses Lyocell ramie blended yarn and polylactic acid filament, extending the common performance advantages of the two materials, and at the same time bringing a natural style to the fabric. Through the innovation of the setting and dyeing processes, the softness of polylactic acid is maintained, and the risk of ramie itchiness is reduced under low - temperature conditions. Specific embodiments

[0025] The present invention will be further described in conjunction with embodiments.

[0026] As an embodiment of the present invention, a manufacturing process for a lactic acid ramie double - sided fabric includes the following steps:

[0027] I. Yarn preparation:

[0028] A: The mass percentage of the siro - compact spun blended yarn of 50S / 1 13% ramie fiber and 87% Lyocell fiber is 46.5%;

[0029] B: The mass percentage of 75D / 72F PLA / DTY full dull is 33.2%;

[0030] C: The mass percentage of 30D low - temperature spandex is 20.3%;

[0031] The blended yarn is made of 13% ramie fiber and 87% lyocell fiber by a siro compact spinning machine. The yarn has bright colors and good moisture absorption and air permeability. The addition of lyocell fiber to ramie fiber increases the softness of the yarn and makes the yarn even, avoiding the phenomenon of bursting caused by the toughness of ramie yarn in previous weaving. The natural bamboo effect of ramie fiber also gives the cloth a natural texture.

[0032] The combination of spandex and polylactic acid filaments can enhance the mechanical strength of polylactic acid filaments and prevent breakage, avoiding the phenomenon of yarn breakage during high-density weft knitting, and improving the problems of poor mechanical strength and breakage of polylactic acid filaments to a certain extent.

[0033] 2. Grey cloth weaving production:

[0034] The prepared yarn is woven into grey cloth on a circular knitting machine, and the steps include:

[0035] Arrange needles → triangle layout → cover triangle seat → hang polylactic acid filament on the yarn rack → thread the yarn to the yarn feeder and yarn nozzle → hang spandex on the spandex rack → hang yarn on needles → start the machine and adjust the conveyor disc;

[0036] The circular knitting machine is a double-sided machine with two needle tracks and dense needles. It uses a 34-inch needle cylinder, 28 needles per inch, and high and low needle butts with a thickness of 41 threads. According to 2 needles / cycle, the upper needle high butt needle and the lower needle low butt needle are opposite, and the upper needle low butt needle and the lower needle high butt needle are opposite. A circle of triangle seats are installed on the top and side of the needle cylinder respectively. Every 6 triangle seats form a cycle, and each triangle seat has two high and low butt needle tracks. After arranging the needle angles according to Table 1, hang the polylactic acid filament and blended yarn on the yarn rack one by one, and hang the spandex on the spandex rack. Start arranging the yarn from the first route, hang the traction yarn on the knitting needle, insert the yarn into a loop, and string the continuous unit coils in one direction to form a knitted grey cloth.

[0037] Adjust the conveyor plate to the length of the polylactic acid fiber yarn is 27.5cm / the length of the blended yarn is 27.5cm / the length of the spandex yarn is 14cm=50 cycles / 100 needles. After verifying that the process is correct, the machine can be started for production.

[0038] Table 1: Needle angle table of circular knitting machine

[0039]

[0040] In this process, there are more spandex paths. To ensure uniform feeding of spandex and a flat fabric surface, based on the traditional spandex frame, the present invention increases the original weight. On the spandex ball mounting rack, the weight of the roller wheel increases the downward force on the spandex ball. During the production process, when the spandex ball becomes lighter, it is fixed on the spandex frame, preventing it from shifting horizontally or bouncing left and right. Thus, during the production process, the spandex changes from passive yarn feeding to active yarn feeding, the yarn feeding is more stable, the fabric surface effect is smoother, and the fabric quality is improved.

[0041] III. The dyeing and finishing process includes: pre-treatment for fabric dyeing, fabric sizing, dyeing, shaping, and inspection and warehousing.

[0042] 1. Existing difficulties in the dyeing and finishing process:

[0043] (1) Temperature contradiction in the existing shaping process: The conflict between the temperature resistance limit of polylactic acid fiber (135 - 140 °C / 15 s) and the shaping temperature requirement of spandex (≥130 °C);

[0044] (2) Defects in the traditional dyeing process: Insufficient color uptake rate of polylactic acid fiber caused by spandex robbing color, resulting in a color fastness to rubbing of dark colors ≤ 1 - 2 levels;

[0045] (3) Double effects of thermal damage: High-temperature shaping causes the hardening of polylactic acid fiber (crystallinity increases to ≥45%). The softening point of conventional spandex is around 185 °C. At a dyeing temperature of 125 °C for 30 minutes, the elastic modulus loss of spandex is ≥30%. The softening point of low-melting-point spandex is around 120 - 140 °C. When the holding time at 100 °C is extended, the strength loss is obvious.

[0046] To address the above problems, according to the physical and chemical properties of polylactic acid fiber such as heat sensitivity and sensitivity to acids and alkalis, as well as the temperature resistance requirements of spandex, combined with the process optimization goals: rapid temperature rise and fall, using a pH value close to the hydrolysis point of polylactic acid to enable low-temperature dyeing of polylactic acid, low-temperature dyeing to reduce spandex color staining, and low-temperature dyeing to maintain the hand feeling, etc., the dyeing and finishing process is optimized. Through staged temperature control and the synergistic effect of auxiliaries, low-damage and high-quality dyeing and finishing processing of polylactic acid filament and spandex interwoven fabrics are achieved.

[0047] 2. Staged fabric sizing process:

[0048] Three-zone temperature control: Drying zone → Rapid setting zone → Slow cooling zone. Among them, the temperature of the drying zone is 120 - 130 °C, with an error controlled within ±5 °C, the residence time does not exceed 84 seconds, and the wind speed is 1 - 2 m / s; the temperature of the rapid setting zone is 145 - 155 °C, with an error controlled within ±5 °C, the residence time does not exceed 12 seconds, and the wind speed is 1.5 - 2.5 m / s; the temperature of the slow cooling zone is 125 - 135 °C, with an error controlled within ±5 °C, the residence time does not exceed 8 seconds, and the wind speed is 0.5 - 1.0 m / s. During the operation process, it is necessary to precisely control the time so that the fabric is exposed for ≤8 seconds at the critical temperature of 135 °C in the slow cooling zone; after the segmented embryo setting is completed, cooling is ensured through a cooling box. When the outlet temperature of the cooling box <80 °C, the crystallinity of the polylactic acid fiber can be controlled ≤35%.

[0049] Adopt a 9-box MONFUNG type setting machine, use gas heating, set the temperature and wind speed of the setting machine by box section, and set the machine speed at 18 meters per minute. Cooling rate of the cooling box: It takes 15 seconds from 80 °C to 30 °C, and the air volume of the cooling fan is 3000 m 3 / h.

[0050] Table 2 Embryo setting process parameter table

[0051] Cabinet Temperature (°C) Air velocity (m / s) Residence time 1-7 125 1.5 84 8 150 2.0 12 9 133 0.8 8

[0052] 3. Controllable hydrolysis dyeing process:

[0053] When the pH value window is controlled at 2.8 - 3.0, the hydrolysis rate of the polylactic acid fiber can be controlled at 0.5 - 1.2%, control the dyeing temperature at 80 °C for 30 min, and the low-temperature synergistic dyeing makes the dye uptake rate of the polylactic acid fiber >85%, and the mechanical strength retention rate of spandex >90%. Add 0.5 - 1.2 g / L polydimethylsiloxane heat stabilizer and 1.5 - 2.5 g / L anionic anti-staining agent in the dyeing process to make the coloring uniform and improve the staining fastness.

[0054] Table 3 Dyeing process parameter table

[0055]

[0056] 4. Conduct index detection on the obtained finished fabric. After passing the detection, conduct inspection according to the 4-point system standard. After passing the inspection, complete the warehousing of the finished product.

[0057] Table 4 Comparison table of finished product index detection

[0058]

[0059]

[0060] The preferred embodiments of the embodiments of the present application are referred to above, and thus do not limit the scope of the rights of the embodiments of the present application. Any modifications, equivalent replacements, and improvements made by those skilled in the art without departing from the scope and essence of the embodiments of the present application shall fall within the scope of the rights of the embodiments of the present application.

Claims

1. A lactic acid hemp two-sided fabric, characterized in that: The fabric comprises 40-50% by mass of blended yarn, 30-35% of polylactic acid filament and 15-25% of low-temperature spandex; wherein the blended yarn is prepared by using a siro compact spinning winder with 10-15% by mass of ramie fiber and 85-90% of lyocell fiber.

2. The lactic acid hemp double-sided fabric according to claim 1, characterized in that: The fabric preferably comprises 46.5% by weight of blended yarn, 33.2% by weight of polylactic acid filament and 20.3% by weight of low-temperature spandex; the blended yarn is prepared by using a siro compact spinning winder with 13% by weight of ramie fiber and 87% by weight of lyocell fiber.

3. A production process of lactic acid hemp two-sided fabric, characterized in that: The steps include: S1. Preparation of blended yarn: 10-15% by mass of ramie fiber and 85-90% by mass of lyocell fiber are used to prepare the blended yarn by a siro compact spinning winder; S2, yarn preparation: prepare 40-50% by weight of the blended yarn A prepared in step S1, 30-35% of polylactic acid filament B and 15-25% of low-temperature spandex C; S3, grey cloth weaving: the yarn prepared in step S2 is used to weave grey cloth on a circular knitting machine; wherein: the process conditions for the grey cloth weaving are as shown in Table 1; S4. Grey cloth dyeing and finishing: including segmented grey cloth setting, cooling treatment and controlled hydrolysis dyeing, including: Segmented embryo setting: the embryo fabric woven in step S3 is subjected to embryo setting operation through a drying zone, a rapid shaping zone and a slow cooling zone which are arranged continuously, wherein: the temperature of the drying zone is 120-130°C, the error is controlled within the range of ±5°C, the residence time is not more than 84 seconds, and the wind speed is 1-2m / s; the temperature of the rapid shaping zone is 145-155°C, the error is controlled within the range of ±5°C, the residence time is not more than 12 seconds, and the wind speed is 1.5-2.5m / s; the temperature of the slow cooling zone is 125-135°C, the error is controlled within the range of ±5°C, the residence time is not more than 8 seconds, and the wind speed is 0.5-1.0m / s; Cooling treatment: The fabric after segmentation is cooled in a cooling box. The process conditions of cooling treatment are: the outlet temperature of the cooling box does not exceed 80℃; Controlled hydrolysis dyeing: Dyeing operation is performed on the fabric after cooling treatment. The dyeing process indicators are: the pH value of the dye is controlled at 2.8-3.0, the hydrolysis rate of the polylactic acid filament can be controlled within 0.5%-1.2%, the dyeing temperature is controlled below 80℃, the dyeing time is 30min, the dye adsorption amount of the polylactic acid filament should reach 82mg / g, and the dye adsorption amount of the low-temperature spandex should reach 15mg / g; S5, finished product storage: the finished fabric after dyeing and finishing in step S4 is tested for indicators. After passing the test, it is inspected according to the 4-point standard. After passing the test, the finished product is put into storage.

4. The production process of a lactic acid hemp two-sided fabric according to claim 3, characterized in that: During the dyeing operation, 0.5-1.2 g / L of polysiloxane heat stabilizer and 1.5-2.5 g / L of anionic anti-staining agent are added to the dye.

5. The production process of a lactic acid hemp two-sided fabric according to claim 3, characterized in that: The segmented embryo setting adopts a 9-box setting machine, which is gas-fired heated and has a machine speed of 18m / min, wherein the 1st to 7th boxes are drying areas, the 8th box is a rapid setting area, and the 9th box is a slow cooling area.

6. The production process of a lactic acid hemp two-sided fabric according to claim 3, characterized in that: The air volume of the cooling fan of the cooling box is 3000m 3 / h, cooling rate: from 80℃ to 30℃ in 15 seconds.

7. The production process of a lactic acid hemp two-sided fabric according to claim 3, characterized in that: The grey cloth weaving includes arranging needles → triangle layout → covering the triangle seat → hanging polylactic acid filaments on the yarn frame → threading the yarn to the yarn feeder and the yarn nozzle → hanging spandex on the spandex frame → hanging yarn needles → starting the machine and adjusting the conveying disk.

8. The production process of a lactic acid hemp two-sided fabric according to claim 7, characterized in that: The spandex is increased in weight by a spandex roller to prevent left-right lateral movement or jumping.

9. The production process of a lactic acid hemp two-sided fabric according to claim 3, characterized in that: The circular knitting machine is a two-needle track dense-needle double-sided machine, using a 34-inch needle cylinder, 28 needles per inch, high and low needle butts with a thickness of 41 threads, 2 needles / cycle, the upper needle high heel needle and the lower needle low heel needle are opposite, and the upper needle low heel needle and the lower needle high heel needle are opposite. A circle of cam seats are installed on the top and side of the needle cylinder respectively, every 6 cam seats form a cycle, and each cam seat has two high and low heel needle tracks.

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