Polyester shrunk crepe printing processing method

Abstract

The invention discloses a polyester crepe shrinkage printing processing method which comprises the following steps: printing a crepe shrinkage printing paste on a polyester fabric through a flat screen or rotary screen printing method according to pattern requirements, and then drying, performing high-temperature crepe shrinkage pre-shaping treatment, washing with water and performing finished product shaping treatment to form regular concave-convex crepe patterns on the polyester fabric, the wrinkling printing paste comprises a swelling agent, a paste material, an acid, an inorganic salt and a surfactant. According to the invention, a flat screen or rotary screen printing method is adopted, a crepe shrinkage printing paste is printed on the polyester textile, and a series of post-treatment processes are carried out, so that the crepe shrinkage printing processing of the polyester textile is realized, the three-dimensional printing effect of the polyester textile is realized, and the high-quality and high-efficiency three-dimensional printing processing of the polyester textile is realized; and the style effect of the fabric is enriched.

Description

Technical Field

[0001] The invention belongs to the technical field of textile printing, and particularly relates to a polyester shrinkage printing processing method. Background Art

[0002] Since polyester fiber was industrialized and applied to textiles in 1941, polyester fabrics have become one of the most widely used chemical fiber clothing fabrics in daily life. As a polymer material, polyester fiber has the characteristics of high strength, good elasticity, good heat resistance, and excellent wear resistance. It is widely used in the manufacture of industrial products such as clothing and home textiles. In recent years, based on the steady development of dyeing and printing processes for polyester fabrics, the sales of high-quality polyester finished fabrics have accounted for half of the sales of homogeneous products.

[0003] However, as people pursue diversified, fashionable and personalized clothing, the variety of textiles is increasing and the styles are becoming more and more varied. For printed products, people are no longer satisfied with the visual and wearing effects brought by a single print, and begin to pursue cooler, novel and high-end and gorgeous patterns and styles. Therefore, it is very important to develop differentiated and personalized printing varieties, such as shiny gold and silver powder printing, three-dimensional embossed printing, elegant diamond printing, etc. Among them, three-dimensional printing stands out from similar printed finished fabrics due to its elegant and unique style, which not only increases the added value of products, but also increases the economic benefits of enterprises.

[0004] At present, the three-dimensional printed finished fabrics on the market, such as natural fiber fabrics such as cotton and silk, are usually based on the printing process. Chemical substances that can shrink the fibers are applied locally on the surface of the fabric. Among them, NaOH solution is used for cotton fabrics, and Ca(NO3)2 or CaCl2 solution is used for silk fabrics. The difference between the fibers in the printed part and the fibers in the non-printed part is caused to expand or shrink, thereby obtaining products with regular concave and convex patterns on the surface, which have diverse patterns, long durability, and good mechanical properties of the fabric. However, the above method has certain limitations and is not applicable to polyester fibers. For chemical fiber fabrics such as non-woven fabrics, acrylic long-haired fabrics and polyester, embossing machines and ginning machines are usually used. Under the action of moisture, heat and pressure, the fabric is pressed with soft and hard rollers engraved with corresponding patterns, and the colorless concave and convex patterns are pressed on the surface of the fabric by means of the local contraction of the chemical fiber fabric. Although the above method effectively forms a three-dimensional style on the surface of the fabric, there are problems such as poor flexibility of the pattern and complex equipment, which greatly wastes manpower and material resources. Therefore, the development of a mature polyester shrinkage printing process is crucial to the entire chemical fiber industry, and its printed products have great development potential. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a polyester shrinkage printing processing method; the present invention adopts a flat screen or round screen printing method to print a shrinkage printing slurry on a polyester textile, and undergoes a series of post-processing processes to achieve shrinkage printing processing of the polyester fabric, so as to achieve a three-dimensional printing effect of the polyester textile, realize high-quality and efficient three-dimensional printing processing of the polyester fabric, and enrich the effect of the fabric style.

[0006] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0007] A polyester shrink crepe printing processing method, which uses a shrink crepe printing slurry, prints it on the polyester fabric through a flat screen or a rotary screen printing method according to the pattern requirements, and then undergoes drying, high-temperature shrink crepe pre-setting treatment, water washing, and finished product setting treatment to form a regular concave and convex crepe pattern on the polyester fabric;

[0008] The shrinkage printing slurry comprises 50g / L-80g / L of swelling agent, 1g / L-10g / L of paste, 0.1g / L-1g / L of acid, 0.1g / L-5g / L of inorganic salt and 0.1g / L-10g / L of surfactant.

[0009] Preferably, the swelling agent is one of aromatic hydrocarbons, polyoxyethylene fatty alcohol ethers, and halogenated aromatic compounds, or a mixture of two or more thereof; the paste is one of guar gum and modified starch, or a mixture of two of them; the acid is acetic acid or citric acid; the inorganic salt is one of ammonium sulfate and sodium hydrogen phosphate; and the surfactant is one of sodium alkylbenzene sulfonate, sodium fatty acid methyl ester sulfonate, and polydimethylsiloxane.

[0010] Furthermore, the viscosity of the shrinkage printing slurry is in the range of 4000-7000 mPa·s, and the pH value is in the range of 6-7.

[0011] Furthermore, when printing on a flat screen or a rotary screen, the magnetic bar is selected to be 15 mm and the machine speed is 30 m / min.

[0012] Furthermore, the drying is performed by hot air drying or drum drying, the drying temperature is 80-120° C., and the time is 3-5 min.

[0013] Furthermore, the temperature of the high-temperature shrinkage preforming treatment is 160-190°C, the vehicle speed is 30-50m / min, the positive overfeed is 5%-20%, and the fan speed is 400-800 rpm.

[0014] Furthermore, the temperature of the finished product shaping treatment is 150-160° C., the vehicle speed is 40-60 m / min, the positive overfeed is 5%-10%, and the fan speed is 600-800 rpm.

[0015] Furthermore, the water washing is rope-shaped water washing, the water washing temperature is 40° C., and the vehicle speed is 50 m / min.

[0016] Furthermore, the polyester fabric is 100% polyester fabric or a blended fabric of polyester and cotton, wool, nylon fiber, etc.; the polyester fabric is a white blank or a dyed blank that has undergone a desizing and scouring pre-treatment process.

[0017] The beneficial effects of the present invention are:

[0018] The printing processing method of the present invention is to print shrinkage printing paste on polyester textile fabric according to pattern requirements by flat screen or rotary screen printing, and realize shrinkage printing processing of polyester fabric through a series of post-processing processes, thereby realizing the three-dimensional printing effect of polyester textile; the finished polyester shrinkage printing fabric obtained by the present invention has three-dimensional pattern, well-proportioned concave and convex, strong durability and unique style.

[0019] The invention designs a specific shrinkage crepe printing slurry, wherein the swelling agent in the slurry expands and swells the fiber under the action of high-temperature heat treatment to achieve the wrinkling effect; the acid in the slurry adjusts the pH of the slurry to make the slurry a weak acid environment, which is conducive to the uniform swelling effect of the swelling agent; the paste in the slurry can adjust the viscosity; the surfactant in the slurry can reduce the surface tension and improve the solubility of the swelling agent and other components; the inorganic salt can promote the action of the swelling agent, the surfactant and the fiber;

[0020] The method of the invention can effectively prevent the pattern from bleeding through the combination of drying, high-temperature shrinkage pre-shaping treatment, and finished product shaping treatment, thereby achieving shaping of concave and convex three-dimensional patterns and ensuring the durability and stability of the patterns.

[0021] The present invention also realizes shrinkage printing processing of polyester fabric by regulating process parameters such as concentration of each component of slurry, setting temperature, setting speed, overfeed number, fan speed, etc., and has the following effects:

[0022] (1) It can effectively realize the precise control of polyester shrink crepe printing products and efficiently realize the three-dimensional processing of polyester fabric patterns;

[0023] (2) No reduction cleaning or other processes are required, and it has the advantages of short process flow, convenient operation, low energy consumption, high efficiency and environmental protection;

[0024] (3) Little effect on fabric color fastness and tear strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a picture of the finished product of the printing process according to Example 1 of the present invention;

[0026] Figure 2 This is a picture of the finished product of the printing process of comparative example 1 of the present invention. DETAILED DESCRIPTION

[0027] The technical solutions in the present invention will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The invention provides a polyester shrinkage printing processing method, which adopts a shrinkage printing slurry, prints it on the polyester fabric through a flat screen or a rotary screen printing method according to the pattern requirements, and then undergoes drying, high-temperature shrinkage pre-setting treatment, water washing, and finished product setting treatment to form a regular concave and convex wrinkle pattern on the polyester fabric.

[0029] The shrink crepe printing slurry comprises 50g / L-80g / L of swelling agent, 1g / L-10g / L of paste, 0.1g / L-1g / L of acid, 0.1g / L-5g / L of inorganic salt and 0.1g / L-10g / L of surfactant. According to the three-dimensional requirements of the printed pattern, the appropriate slurry concentration is prepared.

[0030] Among them, the swelling agent is one of aromatic hydrocarbons, polyoxyethylene fatty alcohol ethers, and halogenated aromatic compounds, or a mixture of two or more thereof; the paste is one of guar gum and modified starch, or a mixture of two of them; the acid is acetic acid or citric acid; the inorganic salt is one of ammonium sulfate and sodium hydrogen phosphate; and the surfactant is one of sodium alkylbenzene sulfonate, sodium fatty acid methyl ester sulfonate, and polydimethylsiloxane.

[0031] The viscosity of the shrinkage printing paste is in the range of 4000-7000 mPa·s, and the pH value is in the range of 6-7.

[0032] During printing, flat screen printing or rotary screen printing can be selectively selected for printing polyester textiles according to the characteristics of the required printed pattern, and the magnetic bar, scraper, and pressure process parameters can be appropriately adjusted to ensure the accuracy of the pattern printing. Preferably, the magnetic bar is selected to be 15 mm and the speed is 30 m / min.

[0033] The printing machine used for printing is connected with an oven. After the shrink printing paste is printed on the polyester textile, it should be dried quickly to effectively prevent the pattern from bleeding. The drying temperature is 80-120℃ and the time is 3-5min. The drying method is hot air drying or drum drying.

[0034] The dried printed fabric can be subjected to high-temperature shrinkage and pre-setting treatment using a stenter setting machine; the process conditions for high-temperature shrinkage and pre-setting treatment are: temperature 160-190°C, vehicle speed 30-50m / min, positive overfeed 5-20%, and fan speed 400-800 rpm, so that the shrinkage and printing slurry can fully react with the polyester fabric, causing the fibers to swell and shrink, forming a concave and convex three-dimensional pattern.

[0035] After the shrink printing slurry reacts with the polyester fabric, a rope-shaped washing machine is used to desize and wash the fabric, so as to remove the residual slurry and other impurities on the surface of the textile under the mechanical action of water.

[0036] After washing, the textiles can be treated with a stenter setting machine for finished product setting. The process conditions for the finished product setting treatment are: temperature 150-160℃, machine speed 40-60m / min, positive overfeed 5-10%, and fan speed 600-800 rpm to stabilize the width of the textiles and ensure the durability and stability of the pattern on the textiles.

[0037] The polyester fabric in the method of the present invention can be 100% polyester fabric, or a blended fabric of polyester and cotton, wool, nylon fiber, etc.; the polyester fabric can be a white blank after desizing and scouring pretreatment processes, or a dyed blank.

[0038] The present invention is further described in detail below through specific examples.

[0039] The fabric used in the embodiment and the comparative example of the present invention is a composite silk satin chiffon after desizing, refining and dyeing treatment processes, the warp and weft density of the fabric is 110 threads / cm*49 threads / cm, the yarn count is 15D+15D*50D, and the gram weight is 85g / m 2 .

[0040] In the following embodiments and comparative examples, the present invention uses the national standard of the People's Republic of China GB / T 3917.1-2009 "Tear properties of textile fabrics Part 1: Determination of tear strength by impact pendulum method" to measure the tear strength of the polyester shrink-crepe printed finished product and the unshrink-crepe grey cloth, respectively; at the same time, the national standard of the People's Republic of China GB / T 3921-2008 "Textiles - Tests for color fastness - color fastness to washing with soap" is used, and a piece of multi-fiber adjacent fabric is washed for 30 minutes at a temperature of 40°C and a soap concentration of 5g / L, and then dried at room temperature, and the color fastness to washing with soap of the fabric is evaluated using a standard gray sample card.

[0041] Example 1

[0042] The polyester shrinkage printing processing method of this embodiment 1 adopts a rotary screen printing process, comprising the following steps:

[0043] A. Polyester shrink crepe printing paste includes swelling agent, paste, acid, inorganic salt, surfactant and solvent water; the dosage of each component is as follows:

[0044]

[0045] The balance is solvent water;

[0046] The bulking agent is a compound of aromatic hydrocarbons and polyoxyethylene fatty alcohol ethers, with a mass ratio of 3:7; the pH value of the slurry is 6, and the viscosity is 7000 mPa·s;

[0047] B. Place the shrink crepe printing slurry in the printing nickel mesh, adjust the scraper appropriately, select the magnetic rod of 15mm, the speed of 30m / min, and place the printing mesh on the polyester fabric for printing;

[0048] C. Turn on the oven and dry the printed polyester fabric at 100°C for 3.5 minutes to remove the moisture in the slurry;

[0049] D. Then, a stenter setting machine is used to perform high temperature heat treatment on the dried polyester fabric under the process conditions of temperature 160°C, speed 30m / min, positive overfeed 15%, and fan speed 500 rpm;

[0050] E. Then, the polyester fabric after shrinkage and pre-setting is washed in a loose rope shape at a water temperature of 40°C and a speed of 50m / min to clean the impurities such as the residual slurry on the fabric;

[0051] F. After washing, a shaping machine is used to shape the polyester shrink crepe fabric under the process conditions of a temperature of 150°C, a speed of 40m / min, a positive overfeed of 5%, and a fan speed of 800 rpm to obtain a polyester shrink crepe printed finished product.

[0052] The tear strength of the finished product of the crepe printing process in Example 1 and the grey cloth without crepe printing were measured respectively. The results showed that the tear strength of both the finished product of the crepe printing process and the grey cloth without crepe printing exceeded the maximum range of 16N, and the crepe printing process had no significant effect on the strength of the fabric. At the same time, the color fastness of the fabric to soap washing was evaluated, and the results showed that the crepe printing process had no significant effect on the color fastness of the fabric.

[0053] In the desizing and washing process, the fabric of the present invention is easy to desize; Figure 1 As shown, the finished product of the shrinkage printing in Example 1 of the present invention has good shrinkage effect and strong three-dimensional effect.

[0054] The color fastness, style and desizing effect of Example 1 are shown in Table 1.

[0055] Table 1

[0056]

[0057] Example 2

[0058] The polyester shrinkage printing processing method of this embodiment 2 adopts a rotary screen printing process, and includes the following steps:

[0059] A. Polyester shrink crepe printing paste includes swelling agent, paste, acid, inorganic salt, surfactant and solvent water; the dosage of each component is as follows:

[0060]

[0061] The balance is solvent water;

[0062] The bulking agent is a compound of polyoxyethylene fatty alcohol ether and halogenated aromatic compound, with a mass ratio of 4:6; the pH value of the slurry is 6, and the viscosity is 6000 mPa·s;

[0063] B. Place the shrink crepe printing slurry in the printing nickel mesh, adjust the scraper appropriately, select the magnetic rod of 15mm, the speed of 30m / min, and place the printing mesh on the polyester fabric for printing;

[0064] C. Turn on the oven and dry the printed polyester fabric at 80°C for 5 minutes to remove the moisture in the slurry;

[0065] D. Then, a stenter setting machine is used to perform high temperature heat treatment on the dried polyester fabric under the process conditions of temperature 190°C, speed 50m / min, positive overfeed 10%, and fan speed 800 rpm;

[0066] E. Then, the polyester fabric after shrinkage and pre-setting is washed in a loose rope shape at a water temperature of 40°C and a speed of 50m / min to clean the impurities such as the residual slurry on the fabric;

[0067] F. After washing, a shaping machine is used to shape the polyester shrink crepe fabric after washing under the process conditions of temperature 160°C, machine speed 50m / min, positive overfeed 10%, and machine speed 800 rpm to obtain a polyester shrink crepe printed finished product.

[0068] The tear strength of the finished product of the crepe printing process in Example 2 and the grey cloth without crepe processing were measured respectively. The results showed that the tear strength of the finished product of the crepe printing process and the grey cloth without crepe processing exceeded the maximum range of 16N, and the crepe printing process had no significant effect on the strength of the fabric. At the same time, the color fastness of the fabric to soap washing was evaluated, and the results showed that the crepe printing process had no significant effect on the color fastness of the fabric.

[0069] During the desizing and washing process, the fabric of Example 2 of the present invention is easier to desizing; the finished product of the shrinkage printing of Example 2 of the present invention has good shrinkage effect and strong three-dimensional effect.

[0070] The color fastness, style and desizing effect of Example 2 are shown in Table 2.

[0071] Table 2

[0072]

[0073] Example 3

[0074] The polyester shrinkage printing processing method of this embodiment 3 adopts a rotary screen printing process, and includes the following steps:

[0075] A. Polyester shrink crepe printing paste includes swelling agent, paste, acid, inorganic salt, surfactant and solvent water; the dosage of each component is as follows:

[0076]

[0077]

[0078] The balance is solvent water;

[0079] The bulking agent is a compound of aromatic hydrocarbons and polyoxyethylene fatty alcohol ethers, with a mass ratio of 7:3; the pH value of the slurry is 6, and the viscosity is 5000 mPa·s;

[0080] B. Place the shrink crepe printing slurry in the printing nickel mesh, adjust the scraper appropriately, select the magnetic rod of 15mm, the speed of 30m / min, and place the printing mesh on the polyester fabric for printing;

[0081] C. Turn on the oven and dry the printed polyester fabric at 100°C for 4 minutes to remove the moisture in the slurry;

[0082] D. Then, a stenter setting machine is used to perform high temperature heat treatment on the dried polyester fabric under the process conditions of temperature 170°C, speed 40m / min, positive overfeed 20%, and fan speed 600 rpm;

[0083] E. Then, the polyester fabric after shrinkage and pre-setting is washed in a loose rope shape at a water temperature of 40°C and a speed of 50m / min to clean the impurities such as the residual slurry on the fabric;

[0084] F. After washing, a shaping machine is used to shape the polyester shrink crepe fabric after washing under the process conditions of temperature 160°C, machine speed 60m / min, positive overfeed 6%, and machine speed 600 rpm to obtain a polyester shrink crepe printing finished product.

[0085] The tear strength of the crepe printed finished product of Example 3 and the un-crepe processed grey cloth were measured respectively. The results showed that the tear strength of both the crepe printed finished product and the un-crepe processed grey cloth exceeded the maximum range of 16N, and the crepe printing process had no significant effect on the strength of the fabric. At the same time, the color fastness of the fabric to soap washing was evaluated, and the results showed that the crepe printing process had no significant effect on the color fastness of the fabric.

[0086] During the desizing and washing process, the fabric of Example 3 of the present invention is easier to desizing; the finished product of the shrinkage printing of Example 3 of the present invention has good shrinkage effect and strong three-dimensional effect.

[0087] The color fastness, style and desizing effect of Example 3 are shown in Table 3.

[0088] Table 3

[0089]

[0090] Comparative Example 1

[0091] The polyester shrinkage printing processing method of comparative example 1 adopts a rotary screen printing process and comprises the following steps:

[0092] A. Polyester shrink crepe printing paste includes swelling agent, paste, acid, inorganic salt, surfactant and solvent water; the dosage of each component is as follows:

[0093]

[0094] The balance is solvent water;

[0095] The bulking agent is a compound of aromatic hydrocarbons and polyoxyethylene fatty alcohol ethers, with a mass ratio of 2:8; the pH value of the slurry is 5, and the viscosity is 4000 mPa·s;

[0096] B. Place the shrink crepe printing slurry in the printing nickel mesh, adjust the scraper appropriately, select the magnetic rod of 15mm, the speed of 30m / min, and place the printing mesh on the polyester fabric for printing;

[0097] C. Turn on the oven and dry the printed polyester fabric at 130°C for 3 minutes to remove the moisture in the slurry;

[0098] D. Then, a stenter setting machine is used to perform high temperature heat treatment on the dried polyester fabric at a temperature of 200°C, a speed of 60m / min, a positive overfeed of 5%, and a fan speed of 1000 rpm;

[0099] E. Then, the polyester fabric after shrinkage and pre-setting is washed in a loose rope shape at a water temperature of 40°C and a speed of 50m / min to clean the impurities such as the residual slurry on the fabric;

[0100] F. After washing, a shaping machine is used to shape the polyester shrink crepe fabric at a temperature of 170°C, a speed of 60m / min, a positive overfeed of 5%, and a fan speed of 600 rpm to obtain a polyester shrink crepe printed finished product.

[0101] The tear strength of the finished product of the crepe printing process and the grey cloth without crepe printing in Comparative Example 1 was measured respectively. The results showed that the tear strength of both the finished product of the crepe printing process and the grey cloth without crepe printing exceeded the maximum range of 16N, and the crepe printing process had no significant effect on the strength of the fabric. At the same time, the color fastness of the fabric to soap washing was evaluated, and the results showed that the crepe printing process had no significant effect on the color fastness of the fabric.

[0102] During the desizing and washing process, the fabric of Comparative Example 1 is difficult to desize; the finished product of Comparative Example 1 has poor shrinkage effect and poor three-dimensional effect.

[0103] The color fastness, style and desizing effect of Comparative Example 1 are shown in Table 4.

[0104] Table 4

[0105]

[0106]

[0107] In Comparative Example 1, the amount of acid used is large, which reduces the pH value of the shrinkage slurry, and the amount of surfactant used is large. After printing, the surface slurry on the cloth is less and not full. After printing and drying, the setting temperature and setting speed are high, the overfeed number is reduced, and the fan speed is high, so that the printed cloth after the setting heat treatment does not shrink significantly, and the shrinkage effect is not good. The slurry is not easy to be removed during washing, and the washing time needs to be extended. After the finished product is set, the overall shrinkage effect is not three-dimensional enough.

[0108] Comparative Example 2

[0109] The polyester shrinkage printing processing method of comparative example 2 adopts a rotary screen printing process and comprises the following steps:

[0110] A. Polyester shrink crepe printing paste includes swelling agent, paste, acid, inorganic salt, surfactant and solvent water; the dosage of each component is as follows:

[0111]

[0112] The balance is solvent water;

[0113] The bulking agent is polyoxyethylene fatty alcohol ether; the pH value of the slurry is 8, and the viscosity is 8000 mPa·s;

[0114] B. Place the shrink crepe printing slurry in the printing nickel mesh, adjust the scraper appropriately, select the magnetic rod of 15mm, the speed of 30m / min, and place the printing mesh on the polyester fabric for printing;

[0115] C. Turn on the oven and dry the printed polyester fabric at 90°C for 4.5 minutes to remove the moisture in the slurry;

[0116] D. Then, a stenter setting machine is used to perform high temperature heat treatment on the dried polyester fabric under the process conditions of temperature 170°C, speed 55m / min, positive overfeed 25%, and fan speed 400 rpm;

[0117] E. Then, the polyester fabric after shrinkage and pre-setting is washed in a loose rope shape at a water temperature of 40°C and a speed of 50m / min to clean the impurities such as the residual slurry on the fabric;

[0118] F. After washing, a shaping machine is used to shape the polyester shrink crepe fabric under the process conditions of a temperature of 140°C, a speed of 35m / min, a positive overfeed of 8%, and a fan speed of 500 rpm to obtain a polyester shrink crepe printed finished product.

[0119] The tear strength of the finished product of the crepe printing process and the grey cloth without crepe printing in Comparative Example 2 was measured respectively. The results showed that the tear strength of both the finished product of the crepe printing process and the grey cloth without crepe printing exceeded the maximum range of 16N, and the crepe printing process had no significant effect on the strength of the fabric. At the same time, the color fastness of the fabric to soap washing was evaluated, and the results showed that the crepe printing process had no significant effect on the color fastness of the fabric.

[0120] During the desizing and washing process, the fabric of Comparative Example 2 is difficult to desize; the finished product of Comparative Example 2 has poor shrinkage effect and poor three-dimensional effect.

[0121] The color fastness, style and desizing effect of Comparative Example 2 are shown in Table 5.

[0122] Table 5

[0123]

[0124]

[0125] The amount of paste used in Comparative Example 2 is large, which increases the viscosity and the amount of inorganic salt used is large. As a result, the stability of the shrinkage slurry is poor, and the surface slurry is uneven after printing. After printing and drying, the finished product setting temperature is low, the overfeed number is large, the fan speed is low, and the shrinkage printed cloth after setting treatment shrinks unevenly, and the shrinkage effect is not good. The slurry is not easy to be completely removed during washing, and the washing time needs to be extended. The overall shrinkage effect of the finished product after setting is not three-dimensional enough.

[0126] Comparative Example 3

[0127] The polyester shrinkage printing processing method of comparative example 3 adopts a rotary screen printing process, comprising the following steps:

[0128] A. Polyester shrink crepe printing paste includes swelling agent, paste, acid, inorganic salt, surfactant and solvent water; the dosage of each component is as follows:

[0129]

[0130] The balance is solvent water;

[0131] The bulking agent is polyoxyethylene fatty alcohol ether; the pH value of the slurry is 6, and the viscosity is 5500 mPa·s;

[0132] B. Place the shrink crepe printing slurry in the printing nickel mesh, adjust the scraper appropriately, select the magnetic rod of 18mm, the speed of 40m / min, and place the printing mesh on the polyester fabric for printing;

[0133] C. Turn on the oven and dry the printed polyester fabric at 100°C for 3.5 minutes to remove the moisture in the slurry;

[0134] D. Then, a stenter setting machine is used to perform high temperature heat treatment on the dried polyester fabric at a temperature of 150°C, a speed of 25 m / min, a positive overfeed of 3%, and a fan speed of 900 rpm;

[0135] E. Then, the polyester fabric after shrinkage and pre-setting is washed in a loose rope shape at a water temperature of 40°C and a speed of 50m / min to clean the impurities such as the residual slurry on the fabric;

[0136] F. After washing, a shaping machine is used to shape the polyester shrink crepe fabric under the process conditions of a temperature of 180°C, a speed of 70m / min, a positive overfeed of 3%, and a fan speed of 900 rpm to obtain a polyester shrink crepe printed finished product.

[0137] The tear strength of the finished product of the crepe printing process and the grey cloth without crepe printing in Comparative Example 3 was measured respectively. The results showed that the tear strength of both the finished product of the crepe printing process and the grey cloth without crepe printing exceeded the maximum range of 16N, and the crepe printing process had no significant effect on the strength of the fabric. At the same time, the color fastness of the fabric to soap washing was evaluated, and the results showed that the crepe printing process had no significant effect on the color fastness of the fabric.

[0138] During the desizing and washing process, the fabric of Comparative Example 3 is difficult to desize, and the finished product has poor shrinkage effect and poor three-dimensional effect.

[0139] The color fastness, style and desizing effect of Comparative Example 3 are shown in Table 6.

[0140] Table 6

[0141]

[0142] In Comparative Example 3, the amount of paste used is large, the amount of inorganic salt and surfactant used is large, and the surface slurry of the cloth is thicker after printing. After printing and drying, the shrinkage pre-setting temperature is low, the shrinkage pre-setting speed is low, the shrinkage pre-setting overfeed number is small, the shrinkage pre-setting fan speed is high, and the shrinkage printed cloth after the shrinkage pre-setting treatment does not shrink sufficiently, and the shrinkage effect is not good. The slurry is not easy to be withdrawn during washing, and the washing time needs to be extended and the washing temperature needs to be increased. The finished product setting temperature is high, the finished product setting speed is high, the finished product setting overfeed number is small, the finished product setting fan speed is high, and the overall shrinkage effect after the finished product is set is not three-dimensional enough.

[0143] Compared with comparative examples 1-3, the methods of embodiments 1-3 of the present invention can effectively realize the three-dimensional processing of polyester fabric patterns, have unique pattern effects, and do not require processes such as reduction cleaning, have little effect on the color fastness and tear strength of the fabric, and have the advantages of short process flow, convenient operation, low energy consumption, high efficiency and environmental protection.

[0144] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0145] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A polyester shrinkage printing method, characterized in that: A shrinkage printing paste is used to print on polyester fabric through flat screen or rotary screen printing according to the pattern requirements, and then dried, subjected to high temperature shrinkage pre-setting treatment, washed, and finished product setting treatment to form a regular concave and convex crepe pattern on the polyester fabric; The shrinkage printing paste comprises 50g / L-80g / L of swelling agent, 1g / L-10g / L of paste, 0.1g / L-1g / L of acid, 0.1g / L-5g / L of inorganic salt and 0.1g / L-10g / L of surfactant.

2. A polyester shrinkage printing processing method according to claim 1, characterized in that: The swelling agent is one of aromatic hydrocarbons, polyoxyethylene fatty alcohol ethers, and halogenated aromatic compounds, or a mixture of two or more thereof; the paste is one of guar gum and modified starch, or a mixture of two of them; the acid is acetic acid or citric acid; the inorganic salt is one of ammonium sulfate and sodium hydrogen phosphate; and the surfactant is one of sodium alkylbenzene sulfonate, sodium fatty acid methyl ester sulfonate, and polydimethylsiloxane.

3. A polyester shrinkage printing processing method according to claim 1, characterized in that: The viscosity of the shrinkage printing paste is in the range of 4000-7000 mPa·s, and the pH value is in the range of 6-7.

4. A polyester shrinkage printing processing method according to claim 1, characterized in that: When printing on flat screen or rotary screen, the magnetic bar should be 15mm and the machine speed should be 30m / min.

5. A polyester shrinkage printing processing method according to claim 1, characterized in that: The drying is performed by hot air drying or drum drying, the drying temperature is 80-120° C., and the time is 3-5 minutes.

6. A polyester shrinkage printing processing method according to claim 1, characterized in that: The temperature of the high-temperature shrinkage preforming treatment is 160-190°C, the machine speed is 30-50m / min, the positive overfeed is 5%-20%, and the fan speed is 400-800 rpm.

7. A polyester shrinkage printing processing method according to claim 1, characterized in that: The temperature of the finished product shaping treatment is 150-160° C., the vehicle speed is 40-60 m / min, the positive overfeed is 5%-10%, and the fan speed is 600-800 rpm.

8. A polyester shrinkage printing processing method according to claim 1, characterized in that: The water washing is rope washing, the water washing temperature is 40° C., and the vehicle speed is 50 m / min.

9. A polyester shrinkage printing processing method according to claim 1, characterized in that: The polyester fabric is 100% polyester fabric or polyester blended fabric.

10. A polyester shrinkage printing method according to claim 1 or 9, characterized in that: The polyester fabric is a white base or a dyed base that has been pre-treated by desizing and scouring.

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