Regenerated superfine fiber double-single printed fabric and preparation method thereof

Abstract

The invention relates to the technical field of printing and dyeing, and discloses a regenerated superfine fiber double-single printed fabric and a preparation method thereof.The preparation method comprises the following steps of spinning and aftertreatment, weaving, gray fabric pretreatment, double-single printing, fixation and aftertreatment and product detection, composite printed patterns are arranged on the surface of the gray fabric, the alignment precision error of the printed patterns is smaller than or equal to 0.5 mm, the composite printed patterns comprise ground color patterns and local fine patterns, the hand feeling softness of the fabric is smaller than or equal to 1.5 cN, the defective product rate of the fabric is smaller than or equal to 2%, the color fastness to washing of the fabric is larger than or equal to level 4, and the moisture permeability of the fabric is larger than or equal to 7500 g / m.24 h. By adopting a combined process of rotary screen printing and digital ink-jet printing, the printing alignment precision is accurately controlled, and accurate overprinting of ground color patterns and local fine patterns is realized, so that the effects of reducing the printing defective rate, improving the production efficiency, reducing the reprinting production cost, improving the added value of products and attracting customers to purchase can be achieved.

Description

Technical Field

[0001] The present invention relates to the field of printing and dyeing technology, and specifically to a regenerated superfine fiber double-single printed fabric and a preparation method thereof. Background Art

[0002] Printing and dyeing is a processing process for dyeing and printing textile materials. By using dyes or pigments to treat textiles, various colors, patterns and special effects can be obtained. A series of pretreatment and post-treatment processes are also required during the printing and dyeing process. Pretreatment includes desizing, scouring, bleaching, etc., aiming to remove impurities, sizing agents, etc. on the fabric and improve the water absorbency and dyeing performance of the fabric; post-treatment includes washing, soaping, color fixing, softening finishing, etc., to remove unfixed dyes and impurities on the fabric and improve the color fastness, hand feeling, appearance and other properties of the fabric. The development of printing and dyeing technology not only enriches the variety of colors and patterns of textiles, meets people's needs for fashion and beauty, but also promotes the continuous progress of the textile industry.

[0003] Existing printing and dyeing makes the fiber colored by adsorbing and diffusing dye molecules in the dye liquor on the fiber surface and penetrating into the interior, and fixing them by means of ionic bonds, covalent bonds and other forces. Then, the color paste is transferred to the fabric to form a pattern by means of screen squeegee extrusion, nozzle spraying according to digital information or a patterned roller dipping slurry and pressing, etc. However, existing printing and dyeing has insufficient accuracy in overprinting the background pattern and local fine patterns, resulting in an increase in the defective rate of printing and the cost of reprinting. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a regenerated superfine fiber double-single printed fabric and a preparation method thereof, which solves the problem of the increase in the defective rate of printing caused by the insufficient accuracy of existing printing and dyeing in overprinting the background pattern and local fine patterns.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A regenerated superfine fiber double-single printed fabric, the fabric substrate is a woven grey fabric made of regenerated superfine fiber, and a composite printed pattern is provided on the surface of the grey fabric, and the alignment accuracy error of the printed pattern ≤ 0.5 mm.

[0006] Preferably, the regenerated superfine fiber is regenerated polyester fiber, and the composite printed pattern includes a background pattern and a local fine pattern.

[0007] A preparation method of a regenerated superfine fiber double-single printed fabric includes the following steps: S1. Spinning and post-treatment: Melting and spinning the regenerated superfine fiber raw material to prepare fibers, and performing drawing and heat setting treatments; S2. Weaving: Weaving the treated fibers into a grey fabric by a weaving process; S3. Pretreatment of greige fabric: Desizing, scouring, and bleaching the greige fabric are carried out. S4. Double - single printing: First, background color printing and then local fine pattern printing are carried out in sequence. S5. Color fixation and post - treatment: The printed fabric is subjected to steaming for color fixation, water washing, and setting. S6. Product inspection: Quality inspection of the finished product is carried out.

[0008] Preferably, in S1, the spinning temperature is 250 - 290 °C, the spinning speed is 3000 - 4000 m / min, the heat - setting temperature is 180 - 220 °C, and the time is 30 - 90 s.

[0009] Preferably, in S2, the weaving process uses an air - jet loom, the warp density is 60 - 80 ends / cm, and the weft density is 50 - 70 picks / cm.

[0010] Preferably, in S3, for desizing, a composite enzyme desizing agent is used, the temperature is 50 - 65 °C, and the time is 30 - 50 min; for scouring, an anionic scouring agent is used, the temperature is 95 - 105 °C, and the time is 50 - 70 min; for bleaching, the concentration of hydrogen peroxide used is 3 - 6 g / L, the temperature is 90 - 98 °C, and the time is 60 - 90 min.

[0011] Preferably, in S4, for background color printing, rotary screen printing is used, the screen mesh number is 60 - 90 meshes, the drying temperature is 100 - 120 °C; for local printing, digital ink - jet printing is used, the resolution is 600 - 1200 dpi, and the interval time between the two printings is 1.5 - 3 hours.

[0012] Preferably, in S5, during steaming, the temperature is 130 - 150 °C, and the time is 20 - 35 min; for water washing, three - stage counter - current water washing is adopted, and the temperature decreases step by step; during setting, the temperature is 160 - 180 °C, and the vehicle speed is 20 - 35 m / min.

[0013] Preferably, in S6, the color fastness inspection includes wash fastness, rubbing fastness, and perspiration fastness; the physical property inspection includes breaking strength, tearing strength, and dimensional stability; the environmental protection index inspection includes formaldehyde content, pH value, and heavy metal content.

[0014] Preferably, the hand - softness of the fabric is ≤1.5 cN, the defective rate of the fabric is ≤2%, the wash fastness of the fabric is ≥4 grades, and the moisture permeability of the fabric is ≥7500 g / m²·24 h.

[0015] The present invention provides a regenerated superfine fiber double - single printed fabric and its preparation method. It has the following beneficial effects: 1. By adopting the combined process of rotary screen printing and digital inkjet printing, the present invention precisely controls the printing alignment accuracy, realizes the accurate overprinting of the background pattern and the local fine pattern, which improves the pattern layering and detail expressiveness of the printed fabric, thereby achieving the effects of reducing the printing defective rate, improving production efficiency, reducing the reprint production cost, increasing the product added value, and attracting customers to purchase.

[0016] 2. With regenerated polyester fiber as the base material, the present invention combines the composite enzyme desizing process and low-concentration hydrogen peroxide bleaching, reduces the chemical dosage and the difficulty of wastewater treatment, and the formaldehyde content, pH value and heavy metal content of the finished fabric meet the international environmental protection standards. At the same time, it has excellent moisture permeability, thereby achieving the effects of ensuring the comfort of the finished fabric, ensuring the environmental protection and harmlessness of the product, and avoiding harm to the environment and human body.

[0017] 3. By adopting the staged steaming and color fixation process combined with the local color compensation technology of digital inkjet printing, the present invention ensures that the wash color fastness is ≥4 levels, reduces the energy consumption of the traditional steaming process at the same time, optimizes the interval time between two printings to 1.5 - 3 hours, shortens the production cycle compared with the traditional process, and improves the overall production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic flow chart of the preparation method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present invention.

[0020] Please refer to the attached Figure 1 , the embodiment of the present invention provides a regenerated superfine fiber double-single printed fabric and its preparation method, including the following steps: S1. Spinning and post-treatment: Melting and spinning the regenerated superfine fiber raw material to prepare fibers, and performing drawing and heat setting treatments; S2. Weaving: Weaving the treated fibers into grey cloth through the weaving process; S3. Grey cloth pretreatment: Desizing, scouring and bleaching the grey cloth; S4. Double-single printing: Perform background printing and local fine pattern printing in sequence; S5. Color fixation and post-treatment: Perform steaming and color fixation, water washing and setting treatments on the printed fabric; S6. Product inspection: Perform quality inspection on the finished product.

[0021] See the appendix Figure 1 The fabric substrate is a woven grey fabric made of recycled superfine fibers. The surface of the grey fabric is provided with a composite printing pattern, and the registration accuracy error of the printing pattern is ≤ 0.5 mm. The recycled superfine fibers are recycled polyester fibers. The composite printing pattern includes a background pattern and a local fine pattern. In S1, the spinning temperature is 250 - 290 °C, the spinning speed is 3000 - 4000 m / min, the heat setting temperature is 180 - 220 °C, and the time is 30 - 90 s. In S2, the weaving process uses an air-jet loom, the warp density is 60 - 80 ends / cm, and the weft density is 50 - 70 picks / cm. In S3, the desizing uses a composite enzyme desizing agent, the temperature is 50 - 65 °C, the time is 30 - 50 min, the scouring uses an anionic scouring agent, the temperature is 95 - 105 °C, the time is 50 - 70 min, the hydrogen peroxide concentration used for bleaching is 3 - 6 g / L, the temperature is 90 - 98 °C, and the time is 60 - 90 min. In S4, the background printing uses rotary screen printing, the screen mesh number is 60 - 90 meshes, the drying temperature is 100 - 120 °C, the local printing uses digital inkjet printing, the resolution is 600 - 1200 dpi, and the interval time between the two printings is 1.5 - 3 hours. In S5, the steaming temperature is 130 - 150 °C, the time is 20 - 35 min, the water washing uses three-stage countercurrent water washing, the temperature decreases step by step, the setting temperature is 160 - 180 °C, and the vehicle speed is 20 - 35 m / min. In S6, the color fastness test includes wash fastness, rubbing fastness, and perspiration fastness. The physical property test includes breaking strength, tearing strength, and dimensional stability. The environmental protection index test includes formaldehyde content, pH value, and heavy metal content. The hand softness of the fabric is ≤ 1.5 cN, the defective rate of the fabric is ≤ 2%, the wash fastness of the fabric is ≥ 4 levels, and the moisture permeability of the fabric is ≥ 7500 g / m²·24h.

[0022] Specifically, the spinning temperature is set in the range of 250 - 290 °C. Within this temperature range, the polymer melt has appropriate fluidity, neither too high viscosity due to too low temperature resulting in difficult spinning nor degradation due to too high temperature. The spinning speed is selected as 3000 - 4000 m / min. This speed range takes into account both production efficiency and fiber quality. At a lower speed, the fiber has more sufficient time to crystallize during the cooling process, and higher orientation and crystallinity can be obtained, but the production efficiency is relatively low. A higher speed can increase the output, but the effectiveness and stability of the cooling device need to be ensured to avoid quality fluctuations caused by uneven fiber cooling.

[0023] Heat setting process: The heat setting temperature is set at 180 - 220 °C, and the time is 30 - 90 s. During the heat setting process, the molecular chains inside the fiber will rearrange and crystallize, thereby improving the dimensional stability and physical properties of the fiber. Lower temperature and shorter time are suitable for products with not particularly high requirements for dimensional stability, while higher temperature and longer time can enable the fiber to obtain a more stable structure and higher strength.

[0024] Woven process: Woven using an air-jet loom, the warp density is set at 60 - 80 threads / cm, and the weft density is set at 50 - 70 threads / cm. During the weaving process, the warp and weft densities need to be reasonably adjusted according to the fabric's organizational structure and use. It is necessary to ensure that the weft insertion system of the air-jet loom can accurately and stably insert the weft yarn between the warp yarns. At the same time, attention should be paid to the tension and arrangement of the warp yarns to avoid defects such as warp breakage or weft contraction. In addition, parameters such as the loom speed and shedding time also need to be optimized according to the warp and weft densities to ensure the fabric quality and production efficiency.

[0025] Sizing agent selection: Use a composite enzyme sizing agent, with the desizing temperature controlled at 50 - 65°C and the time being 30 - 50 min. The composite enzyme sizing agent has the characteristics of high efficiency and environmental protection, and can decompose the sizing on the fabric under relatively mild conditions.

[0026] Scouring agent selection: Use an anionic scouring agent, with the scouring temperature set at 95 - 105°C and the time being 50 - 70 min. The anionic scouring agent can effectively remove the natural impurities and residual sizing on the fabric, improving the whiteness and water absorbency of the fabric.

[0027] Bleaching agent selection: The concentration of hydrogen peroxide used for bleaching is 3 - 6 g / L, the temperature is 90 - 98°C, and the time is 60 - 90 min. Hydrogen peroxide is a commonly used environmentally friendly bleaching agent, with advantages such as good bleaching effect and no pollution.

[0028] Background printing: Use rotary screen printing, with the screen mesh number set at 60 - 90 meshes, and the drying temperature at 100 - 120°C. Rotary screen printing has the characteristics of high production efficiency and high pattern accuracy, and is suitable for large-scale production. The screen mesh number is reasonably adjusted according to the fineness of the pattern and the ink absorbency of the fabric. A higher screen mesh number can obtain a finer pattern effect, but the production efficiency is relatively low; a lower screen mesh number can improve the production efficiency, but the pattern accuracy will be reduced.

[0029] Local printing: Use digital inkjet printing, with a resolution of 600 - 1200 dpi, and the interval time between two printings being 1.5 - 3 hours. Digital inkjet printing has the advantages of flexible pattern design and rich colors, and is suitable for small-batch and multi-variety production. A higher resolution can obtain a finer pattern effect, but it will also increase production costs and time. The setting of the interval time between two printings should ensure that the ink from the previous printing is fully dried to avoid pattern blurring or adhesion due to wet ink.

[0030] Steaming: The steaming temperature is 130 - 150°C, and the time is 20 - 35 min. Steaming can make the printing ink fully combine with the fabric fibers, improving the color fastness and vividness of the pattern.

[0031] Water washing: Three-stage countercurrent water washing is adopted. The temperature of the first stage is 80 - 90°C, containing 0.5 - 1 g / L of sodium hydrosulfite; The temperature of the second stage is 60 - 70°C, containing 0.3 - 0.5 g / L of soda ash; the temperature of the third stage is ≤40°C, and the pH value is 7 - 8. The temperature gradually decreases. Three-stage countercurrent water washing can effectively remove the floating color and impurities on the fabric, improve the whiteness and color fastness of the fabric. The design of gradually decreasing temperature can avoid the shrinkage or deformation of the fabric caused by sudden temperature change.

[0032] Setting: The setting temperature is 160 - 180°C, and the machine speed is 20 - 35 m / min. Setting can enable the fabric to obtain stable dimensions and shapes, and improve the wrinkle resistance and abrasion resistance of the fabric.

[0033] Color fastness testing: It includes wash fastness, rub fastness, and perspiration fastness. Among them, the wash fastness ≥ 4 grades, the rub fastness ≥ 4 grades (dry rub, wet rub), and the perspiration fastness ≥ 4 grades (acid, alkali). Color fastness is an important indicator to measure the dyeing quality of the fabric, which directly affects the service performance and aesthetics of the fabric. Through color fastness testing, it can ensure that the fabric will not fade or lose color during use.

[0034] Physical property testing: It includes breaking strength, tearing strength, and dimensional stability. Among them, the breaking strength ≥ 800 N (warp direction), the breaking strength ≥ 600 N (weft direction), the tearing strength ≥ 15 N (warp direction), the tearing strength ≥ 12 N (weft direction); Dimensional stability: The warp shrinkage rate ≤ 2%, and the weft shrinkage rate ≤ 1.5%. Through physical property testing, it can ensure that the fabric has sufficient strength and stability to meet different use requirements.

[0035] Environmental protection index testing: It includes formaldehyde content, pH value, and heavy metal content. Among them, the formaldehyde content ≤ 20 mg / kg, the pH value is 4.0 - 7.5, and the heavy metal content: lead ≤ 90 mg / kg, cadmium ≤ 100 mg / kg. The environmental protection index is an important standard to measure whether the fabric meets the environmental protection requirements, which is directly related to human health and environmental safety. Through environmental protection index testing, it can ensure that the fabric does not contain harmful substances and meets the national and international environmental protection standards.

[0036] Example 1: Optimization of the spinning process 1. Spinning temperature: By adjusting and narrowing the temperature range to 280 - 310°C, the melt fluidity is ensured to be stable, reducing the phenomenon of broken filaments and flyings. Among them, the lower temperature limit is increased by 30°C to avoid insufficient fiber drawing caused by insufficient temperature; the upper limit is reduced by 30°C to prevent the degradation of polymer molecular chains at high temperature and affect the fiber strength.

[0037] 2. Spinning speed: By adjusting the lower limit of the spinning speed to 3500 m / min, the fibers are oriented at a higher draw ratio, improving the breaking strength and modulus.

[0038] 3. Heat setting temperature: By adjusting the heat setting temperature to 190 - 210 °C, it is avoided that uneven fiber shrinkage occurs due to too low temperature or the fibers become brittle due to too high temperature. Example 2: Optimization of the weaving process Warp and weft density: By adjusting the warp and weft density to 65 - 75 warp ends / cm and 55 - 65 weft picks / cm, the fabric structure becomes more uniform and the number of defect points is reduced. Example 3: Optimization of the grey fabric pretreatment process 1. Desizing: The temperature range is reduced to 55 - 60 °C to avoid incomplete desizing at low temperature or fiber damage at high temperature. An amylase mixed with pectinase complex desizing agent is used, and the desizing rate is increased from 95% to 98%, reducing the subsequent scouring burden.

[0039] 2. Scouring: The scouring temperature is adjusted to 98 - 102 °C to avoid fiber yellowing at too high temperature, and the scouring time is adjusted to 55 - 65 min.

[0040] 3. Bleaching: The hydrogen peroxide concentration is adjusted to 4 - 5 g / L, and at the same time, the bleaching temperature is adjusted to 92 - 96 °C and the bleaching time is adjusted to 70 - 80 min. The experimental results of the examples are shown in the following figure: According to the above experiments, the present invention has the following effects: Fiber properties: In terms of the breaking strength of the fibers, the values of Example 1, Example 2 and Example 3 are all significantly higher than those of the prior art, indicating that the present invention can effectively enhance the tensile resistance of the fibers, making the fibers more tough and durable. In terms of the fiber hairiness rate, all three examples are much lower than those of the prior art, reducing the hairiness phenomenon and improving the appearance quality and quality stability of the fibers. In terms of the fiber modulus, Example 1, Example 2 and Example 3 are also higher than 10.0 GPa of the prior art, improving the rigidity and stability of the fibers, which helps the fibers to maintain a good shape during subsequent processing and use.

[0041] Fabric quality: The number of fabric defect points in all three examples is less than 20.0 per square meter of the prior art. In particular, the effect of Example 2 is significant, indicating that the optimized process of the present invention can make the fabric structure more uniform, effectively reduce the defective product rate, and improve the overall quality and quality of the fabric.

[0042] Optimized pretreatment process: In terms of desizing rate, those of Example 1, Example 2 and Example 3 are all higher than 95% of the prior art, and Example 3 has the best effect, indicating that the desizing process adopted by the present invention can remove the sizing agent more thoroughly, reduce the subsequent scouring burden. In terms of the utilization rate of hydrogen peroxide, those of Example 1, Example 2 and Example 3 are all higher than 70% of the prior art, and Example 3 has the highest utilization rate, indicating that the optimized bleaching process of the present invention can improve the utilization efficiency of hydrogen peroxide, make the bleaching more uniform, and at the same time reduce energy consumption. In terms of the grease removal rate (in the scouring link), those of Example 1, Example 2 and Example 3 are all higher than 80% of the prior art, and Example 3 has the best effect, meaning that the scouring process of the present invention can remove grease more effectively and further improve the quality of the fabric.

[0043] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A regenerated superfine fiber double-single printed fabric, characterized in that: The fabric substrate is a woven grey cloth made of recycled superfine fibers, and a composite printing pattern is provided on the surface of the grey cloth, with the alignment precision error of the printing pattern ≤ 0.5 mm.

2. The regenerated superfine fiber double-single printed fabric according to claim 1, characterized in that, The recycled superfine fibers are recycled polyester fibers, and the composite printing pattern includes a background color pattern and a partial fine pattern.

3. A method for preparing a regenerated superfine fiber double-single printed fabric, a regenerated superfine fiber double-single printed fabric according to any one of claims 1-2, characterized in that, It includes the following steps: S1. Spinning and post-treatment: Preparing fibers by melt spinning the recycled superfine fiber raw materials, and performing drawing and heat setting treatments; S2. Weaving: Weaving the treated fibers into a grey cloth by a weaving process; S3. Grey cloth pretreatment: Performing desizing, scouring and bleaching treatments on the grey cloth; S4. Double single printing: Sequentially performing background color printing and partial fine pattern printing; S5. Fixing and post-treatment: Performing steaming and fixing, water washing and setting treatments on the printed fabric; S6. Product inspection: Conducting quality inspection on the finished product.

4. The preparation method of a regenerated superfine fiber double-single printed fabric according to claim 3, characterized in that: In S1, the spinning temperature is 250 - 290 °C, the spinning speed is 3000 - 4000 m / min, the heat setting temperature is 180 - 220 °C, and the time is 30 - 90 s.

5. The preparation method of a regenerated superfine fiber double-single printed fabric according to claim 3, characterized in that: In S2, the weaving process uses an air-jet loom, with a warp density of 60 - 80 ends / cm and a weft density of 50 - 70 picks / cm.

6. The preparation method of a regenerated superfine fiber double-single printed fabric according to claim 3, characterized in that: In S3, for desizing, a composite enzyme desizing agent is used, with a temperature of 50 - 65 °C and a time of 30 - 50 min; for scouring, an anionic scouring agent is used, with a temperature of 95 - 105 °C and a time of 50 - 70 min; for bleaching, the concentration of hydrogen peroxide used is 3 - 6 g / L, the temperature is 90 - 98 °C, and the time is 60 - 90 min.

7. The preparation method of a regenerated superfine fiber double-single printed fabric according to claim 3, characterized in that: In S4, for background color printing, rotary screen printing is used, with a screen mesh number of 60 - 90 meshes, a drying temperature of 100 - 120 °C; for partial printing, digital inkjet printing is used, with a resolution of 600 - 1200 dpi, and the interval time between the two printings is 1.5 - 3 hours.

8. The preparation method of a regenerated superfine fiber double-single printed fabric according to claim 3, characterized in that: In S5, during steaming, the temperature is 130 - 150 °C and the time is 20 - 35 min; water washing adopts three-stage countercurrent water washing, with the temperature gradually decreasing; during setting, the temperature is 160 - 180 °C and the vehicle speed is 20 - 35 m / min.

9. The preparation method of a regenerated superfine fiber double-single printed fabric according to claim 3, characterized in that: In S6, the color fastness inspection includes wash fastness, rubbing fastness and perspiration fastness; the physical property inspection includes breaking strength, tearing strength and dimensional stability; the environmental protection index inspection includes formaldehyde content, pH value and heavy metal content.

10. The preparation method of a regenerated superfine fiber double-single printed fabric according to claim 3, characterized in that: The hand softness of the fabric ≤ 1.5 cN, the defective rate of the fabric ≤ 2%, the wash fastness of the fabric ≥ 4 grades, and the moisture permeability of the fabric ≥ 7500 g / m²·24 h.

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