A hand proofing method
By using a manual pattern-based reduction printing method and employing a sealed foaming and color-developing technology with high-concentration reducing solution and starch paste, the problems of time-consuming, expensive, and polluting reduction printing in small laboratories have been solved, achieving fast and accurate printing results.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- ZHEJIANG MIZUDA TEXTILE PRINTING & DYEING TECH CO LTD
- Filing Date
- 2023-12-22
- Publication Date
- 2026-05-29
AI Technical Summary
Existing reduction printing processes cannot be handled in small laboratories; they are time-consuming, expensive, and highly polluting, and cannot meet the needs of special printing processes.
The reduction printing method using hand-drawn patterns includes color mixing, printing, drying, padding with reducing solution, sealing and foaming for color development, oxidation washing, high-temperature soaping, and drying. It uses high-concentration reducing solution and starch paste, and optimizes the printing process through sealing and foaming for color development technology.
In the laboratory, the flash evaporation and color fixing of large machines can be quickly and accurately simulated, reducing the difference between the sample and the large machine, saving time and costs, reducing pollution, and improving production efficiency.
Smart Images
Figure CN117721648B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a printing method, and more particularly to a reproduction printing method based on hand-drawn patterns. Background Technology
[0002] In recent years, with increasingly higher requirements, polyester-cotton and nylon-cotton fabrics have become increasingly popular among consumers, leading to a rise in the use of vat dyes and military camouflage fabrics for printing, and the application of vat printing is becoming more widespread. Before normal mass production, vat printing requires a sample preparation process. This sample preparation is generally completed on a large printing press. The printing process involves mixing the dye paste, printing, drying, steaming, padding with steam, oxidation washing, high-temperature soaping, and drying. The padding with steam requires large steam equipment, which is bulky and expensive, making it unsuitable for small laboratories. Furthermore, a single sample preparation on a large press takes 3-4 hours and costs over 4500 yuan, generating approximately 16 tons of wastewater. For some special vat printing processes, repeated sample preparation is necessary until the printing effect, color accuracy, and stability are confirmed before normal mass production can begin. Repeated sample preparation increases the time spent on large-scale sample preparation and wastewater discharge.
[0003] Therefore, the existing large-scale printing machine for color and pattern sizing of reproduction printing has problems such as long processing time, high cost, and significant environmental pollution. Summary of the Invention
[0004] The purpose of this invention is to provide a method for reproduction printing using hand-drawn patterns. This invention replaces large-scale pattern making while ensuring consistent printing results, saving time and costs, and is more environmentally friendly.
[0005] The technical solution of the present invention is a reduction printing method for hand-printed patterns, comprising the following steps: color mixing paste, printing, drying, padding with reducing solution, sealing and bubbling for color development, oxidation washing, high-temperature soaping and drying; wherein the reducing solution comprises the following components in parts by weight: 10-110 parts of sodium hydrosulfite, 10-100 parts of caustic soda, 3-6 parts of penetrant, and 50-250 parts of starch paste.
[0006] In the aforementioned manual pattern-based reduction printing method, the amount of caustic soda in the reduction solution is 30-35% more than that in the main printing machine.
[0007] In the aforementioned method of reproduction printing using hand-drawn patterns, the amount of sodium hydrosulfite used is 25-30% more than that used on a large printing machine.
[0008] In the aforementioned method of reduction printing using hand-printing, the reducing solution comprises the following components in parts by weight: 80-95 parts sodium hydrosulfite, 75-100 parts caustic soda, 3-4 parts penetrant, and 100-200 parts starch paste.
[0009] In the aforementioned method for reproduction printing using hand-drawn patterns, the reproduction liquid comprises the following components: sodium hydrosulfite 90-95 g / L, caustic soda 90-100 g / L, starch paste 100-150 g / L, and penetrant 3-4 g / L.
[0010] In the aforementioned method of reproduction printing using hand-drawn patterns, the sealing and bubbling color development specifically involves: covering the fabric that has been coated with the reducing liquid with a thin film on both sides of the fabric for sealing, and then bubbling and developing color at 170℃-190℃.
[0011] In the aforementioned method of reduction printing using hand-printed patterns, the oxidation washing specifically refers to washing with hydrogen peroxide at a volume concentration of 2% for 1-2 minutes.
[0012] In the aforementioned method of reproduction printing using hand-drawn patterns, the high-temperature soaping specifically refers to soaping at temperatures above 95°C.
[0013] In the aforementioned manual pattern-based reduction printing method, the printing paste comprises the following components in parts by weight: 2-50 parts of neutral dye, 2-50 parts of vat dye, 3.5-5 parts of thickener, 10-20 parts of ammonium sulfate, and 30-80 parts of urea.
[0014] Compared with the prior art, the beneficial effects of the present invention are as follows:
[0015] This invention simulates flash-fixing and sample production in the laboratory. It is used to print on polyester-cotton and nylon-cotton fabrics with vat dyes. The same printed fabric is flash-fixed and fixed on a large machine as the standard. A hand-made sample (S / O) is made in the laboratory using the same fabric. The differences in color, pattern and other aspects between the sample and the large machine are gradually reduced. The sample can be accurately produced in production with the least amount of cost and the shortest time. The results have been verified to be feasible in production.
[0016] This invention optimizes the reduction printing process by increasing the amount of sodium hydrosulfite in the reducing solution during the color-fixing process of the vat dye to ensure the color development of the print, and by adding a certain concentration of starch paste to ensure the integrity of the pattern. Furthermore, it optimizes the process by sealing and bubbling the dye in an oven to achieve the desired color and pattern. This allows for accurate production of the desired color and pattern without the need for flash steaming on a large printing press, achieving a similar printing effect to the pattern printed on a large press. It maintains a clear outline of the pattern and prevents dark colors from bleeding into lighter colors. Additionally, the addition of a penetrant to the reducing solution provides a certain degree of assistance in enhancing the color.
[0017] Comparative tests have shown that products printed using the method of this invention, after washing, have a color and pattern that are basically consistent with those printed using a large-scale flash-washing machine, with a color level of 4.5 or higher, meeting the needs of most users.
[0018] Therefore, the method of the present invention can replace large-scale machine sampling, and the standard pattern and color of reproduction printing can be produced in the laboratory. In production, it can not only reduce the energy consumption of large-scale machines and reduce sampling time, but also eliminate the need to occupy machine space, thereby achieving the goals of saving water and electricity, reducing sewage discharge, lowering costs, and improving production efficiency. Attached Figure Description
[0019] Figure 1 This is a comparison diagram of Embodiment 5 and Comparative Example 1 of the present invention. Detailed Implementation
[0020] The present invention will be further described below with reference to embodiments, but these embodiments are not intended to limit the scope of the invention.
[0021] Printing experiments were conducted using cotton-nylon blended fabrics. Since the best dyes for nylon are acid or neutral dyes, if nylon is not present in actual production, acid dyes can be omitted, and the steaming process can be omitted from the process, while the rest remains basically unchanged.
[0022] Experimental materials: cotton-nylon blended fabric (50:50 weight ratio), with a fabric weight of 240 g / m².
[0023] Neutral dyes for printing: Ya Yun Neutral PHK Gray, PHK Red, PHK Yellow.
[0024] Vat dyes: World Black, BR Brown, F3G Yellow, R Olive.
[0025] Reducing solution: sodium hydrosulfite, caustic soda, penetrant, starch paste.
[0026] Main equipment: 40cm side length plastic film.
[0027] Main equipment: uniform rolling mill, flat baking oven.
[0028] Example 1:
[0029] The method for replicating printing using hand-drawn patterns includes the following steps:
[0030] Color mixing paste, printing, drying, steaming, rolling reduction solution, sealing foaming and color development, oxidation washing, high-temperature soaping and drying.
[0031] The formula for printing paste includes the following components: 2-50g of neutral dye, 2-50g of vat dye, 3.5-5g of thickener, 10-20g of ammonium sulfate, and 30-80g of urea.
[0032] The method for preparing printing paste includes mixing the above-mentioned printing paste raw materials, adding water to 1000g, and stirring until a paste-like paste is formed.
[0033] In the rolling step, the formula of the reducing solution includes the following components: 10-100g of caustic soda, 10-110g of sodium hydrosulfite, 3-6g of penetrant, and 50-250g of starch paste.
[0034] After the reducing agent is applied in the padding machine, both sides of the fabric are sealed with a film and then dried in an oven at 170℃-190℃ for 0.5-2 minutes to induce bubbling and color development. Next, the fabric is washed with 2% hydrogen peroxide for 1-2 minutes, followed by a high-temperature soaping wash at above 95℃. The sealed bubbling and color development process utilizes a film seal, maintaining a certain level of humidity on the fabric surface while the outside of the film is dried, thus preventing the loss of the reducing agent.
[0035] The method for preparing the reducing solution includes mixing the above-mentioned reducing solution raw materials, adding water to 1000g, stirring evenly, and adjusting the amount according to the depth of the color, with more being used for darker colors.
[0036] Example 2:
[0037] The method for replicating printing using hand-drawn patterns includes the following steps:
[0038] Color mixing paste, printing, drying, steaming, rolling reduction solution, sealing foaming and color development, oxidation washing, high-temperature soaping and drying.
[0039] The formula for printing paste includes the following components: 2-50g of neutral dye, 2-50g of vat dye, 3.5-5g of thickener, 10-20g of ammonium sulfate, and 30-80g of urea.
[0040] The method for preparing printing paste includes mixing the above-mentioned printing paste raw materials, adding water to 1000g, and stirring until a paste-like paste is formed.
[0041] In the rolling process, the formula for the reducing solution includes the following components: 90g caustic soda, 80g sodium hydrosulfite, 5g penetrant, and 100g starch paste.
[0042] The method for preparing the reducing solution includes mixing the above-mentioned reducing solution raw materials, adding water to 1000g, stirring evenly, and adjusting the amount according to the depth of the color, with more being used for darker colors.
[0043] After the reducing solution is applied, the front and back sides of the fabric that has been applied are laid flat and sealed with two thin films. The fabric is then placed in a baking oven at 180°C for color development. After the fabric has completely bubbled, it is removed and washed with 2% hydrogen peroxide for 1 minute, followed by a high-temperature soaping wash at 98°C.
[0044] Example 3:
[0045] The method for replicating printing using hand-drawn patterns includes the following steps:
[0046] Color mixing paste, printing, drying, steaming, rolling reduction solution, sealing foaming and color development, oxidation washing, high-temperature soaping and drying.
[0047] The formula for printing paste includes the following components: 2-50g of neutral dye, 2-50g of vat dye, 3.5-5g of thickener, 10-20g of ammonium sulfate, and 30-80g of urea.
[0048] The method for preparing printing paste includes mixing the above-mentioned printing paste raw materials, adding water to 1000g, and stirring until a paste-like paste is formed.
[0049] In the rolling process, the formula for the reducing solution includes the following components: 75g caustic soda, 90g sodium hydrosulfite, 3g penetrant, and 100g starch paste.
[0050] The method for preparing the reducing solution includes mixing the above-mentioned reducing solution raw materials, adding water to 1000g, stirring evenly, and adjusting the amount according to the depth of the color, with more being used for darker colors.
[0051] After the reducing solution is applied, the front and back sides of the fabric that has been applied are laid flat and sealed with two thin films. The fabric is then placed in a baking oven at 170°C for color development. Once the fabric has completely bubbled, it is removed, washed with 2% hydrogen peroxide for 1 minute, and then washed with soap at 96°C.
[0052] Example 4: A method for reproduction printing based on hand-drawn patterns, comprising the following steps:
[0053] Color mixing paste, printing, drying, steaming, rolling reduction solution, sealing foaming and color development, oxidation washing, high-temperature soaping and drying.
[0054] The formula for printing paste includes the following components: 2-50g of neutral dye, 2-50g of vat dye, 3.5-5g of thickener, 10-20g of ammonium sulfate, and 30-80g of urea.
[0055] The method for preparing printing paste includes mixing the above-mentioned printing paste raw materials, adding water to 1000g, and stirring until a paste-like paste is formed.
[0056] In the rolling process, the formula for the reducing solution includes the following components: 100g caustic soda, 95g sodium hydrosulfite, 6g penetrant, and 150g starch paste.
[0057] The method for preparing the reducing solution includes mixing the above-mentioned reducing solution raw materials, adding water to 1000g, stirring evenly, and adjusting the amount according to the depth of the color, with more being used for darker colors.
[0058] After the reducing solution is applied, the front and back sides of the fabric that has been applied are laid flat and sealed with two layers of film. The fabric is then placed in a baking oven at 190°C for color development. Once the fabric has completely bubbled, it is removed, washed with 2% hydrogen peroxide for 1 minute, and then washed with soap at 96°C.
[0059] Example 5:
[0060] The method for replicating printing using hand-drawn patterns includes the following steps:
[0061] Color mixing paste, printing, drying, steaming, rolling reduction solution, sealing foaming and color development, oxidation washing, high-temperature soaping and drying.
[0062] The formula for printing paste includes the following components: 2-50g of neutral dye, 2-50g of vat dye, 3.5-5g of thickener, 10-20g of ammonium sulfate, and 30-80g of urea.
[0063] The method for preparing printing paste includes mixing the above-mentioned printing paste raw materials, adding water to 1000g, and stirring until a paste-like paste is formed.
[0064] In the rolling process, the formula for the reducing solution includes the following components: 90g caustic soda, 90g sodium hydrosulfite, 4g penetrant, and 120g starch paste.
[0065] The method for preparing the reducing solution includes mixing the above-mentioned reducing solution raw materials, adding water to 1000g, stirring evenly, and adjusting the amount according to the depth of the color, with more being used for darker colors.
[0066] After the reducing solution is applied, the front and back sides of the fabric that has been applied are laid flat and sealed with two thin films. The fabric is then placed in a baking oven at 180°C for color development. After the fabric has completely bubbled, it is removed and washed with 2% hydrogen peroxide for 1.5 minutes, followed by a high-temperature soap wash at 95°C or higher.
[0067] Comparative Example 1:
[0068] The method of Comparative Example 1 is basically the same as that of Example 5, except that the reducing solution of Comparative Example 1 does not contain starch paste.
[0069] The reproduction printing products of Comparative Example 1 and Example 5 were compared in terms of pattern, color, and appearance, and judged according to national standards grades 1, 2, 3, 4, and 5. The comparison chart is shown below. Figure 1 As shown.
[0070] from Figure 1 As can be seen, in Comparative Example 1 without added starch paste, the dark edges blurred into the light colors, making the flower shape blurry and mixed with the color. However, in Example 5 with added starch paste, the dark colors did not blur into the edges, maintaining the clear outline of the flower shape. The test results showed that it reached level 4.5.
[0071] Adding starch paste to the reducing solution helps maintain the clarity of the pattern and prevents dark colors from seeping into lighter colors during the production of small-scale samples. The specific amount used depends on the clarity of the pattern in the sample.
[0072] Comparative Example 2:
[0073] Take the same printed cotton-nylon fabric as in Example 5 and perform a large-scale pattern making. Process it according to the large-scale production route, including large-scale rolling, flash evaporation, soaping, and the formula of the reducing solution for padding is: caustic soda 70g / L and sodium hydrosulfite 75g / L.
[0074] The samples from Comparative Example 2 and Example 5 were compared in terms of pattern, color, and appearance, and evaluated according to national standards 1, 2, 3, 4, and 5. The color grade difference reached 4.5, which is basically consistent with the color depth of the large-scale machine. However, both excessive and insufficient amounts of raw materials will affect the color grade.
Claims
1. A method for reproduction printing using hand-drawn patterns, characterized in that: Includes the following steps: The process includes color mixing, printing, drying, padding with reducing solution, sealing and foaming color development, oxidation washing, high-temperature soaping, and drying. The reducing solution comprises the following components in parts by weight: 10-110 parts sodium hydrosulfite, 10-100 parts caustic soda, 3-6 parts penetrant, and 50-250 parts starch paste. The amount of caustic soda in the reducing solution is 30-35% more than that in the main machine. The amount of sodium hydrosulfite is 25-30% more than that in the main machine. The sealing and foaming color development specifically involves covering the fabric padded with the reducing solution with a film on both sides for sealing, and then foaming and developing color at 170℃-190℃.
2. The reproduction printing method for hand-drawn patterns according to claim 1, characterized in that: The reducing solution comprises the following components in parts by weight: 80-95 parts sodium hydrosulfite, 75-100 parts caustic soda, 3-4 parts penetrant, and 100-200 parts starch paste.
3. The reproduction printing method for hand-drawn patterns according to claim 1, characterized in that: The reducing solution comprises the following components: sodium hydrosulfite 90-95 g / L, caustic soda 90-100 g / L, starch paste 100-150 g / L, and penetrant 3-4 g / L.
4. The reproduction printing method for hand-drawn patterns according to claim 1, characterized in that: The oxidation water washing specifically refers to washing with hydrogen peroxide at a volume concentration of 2% for 1-2 minutes.
5. The reproduction printing method for hand-drawn patterns according to claim 1, characterized in that: The high-temperature soap washing specifically refers to soap washing at temperatures above 95°C.
6. The reproduction printing method for hand-drawn patterns according to claim 1, characterized in that: The printing paste comprises the following components in parts by weight: 2-50 parts neutral dye, 2-50 parts vat dye, 3.5-5 parts thickener, 10-20 parts ammonium sulfate, and 30-80 parts urea.