Method for judging whether dark fabric is suitable for heat transfer printing

Abstract

The invention relates to a method for judging whether a dark fabric is suitable for heat transfer printing, and relates to the field of textiles. For a textile printed with light-color printing on a dark-color fabric, disperse dye on the fabric is easily adsorbed by the printing after thermal sublimation, so that the printing is stained, and whether the dark-color fabric is suitable for thermal transfer printing or not needs to be judged. The deep-color fabric is soaked in an ethanol solution with the concentration of 75% and then taken out, and whether the deep-color fabric is suitable for heat transfer printing or not is judged according to the color change degree of the ethanol solution.

Description

Technical Field

[0001] This application relates to the field of textiles, and particularly to a method for determining whether a dark fabric is suitable for heat transfer printing. Background Art

[0002] In textile printing heat transfer technology, patterns are transferred from the flower manuscript to the clothing through high temperature. However, for textiles with light-colored prints on dark fabrics, the disperse dyes on the fabric are prone to thermal sublimation and then adsorbed by the prints, resulting in the quality problem of color bleeding on the prints.

[0003] Chemical fiber fabrics generally use disperse dyes. Disperse dyes are non-ionic dyes. Their molecules are relatively small and do not have water-soluble groups in their structures, so their water solubility is very low. During dyeing, with the help of a dispersant, the disperse dyes dissolve in the dye bath to become disperse dye molecules, and then are adsorbed on the surface of the fiber in the form of molecules. At the end of dyeing, as the temperature decreases, the disperse dye molecules finally fix in the fiber in the form of aggregates. During storage and transportation, the high-temperature and high-humidity environment will cause the thermal sublimation of disperse dyes. When the dye thermally sublimes from the solid state to the gaseous state, the dye changes from a solid macromolecular group to a free single-molecule state. The free mobility of single-molecule dyes is significantly improved compared to macromolecular dye groups. At the same time, there are a large number of group structures similar to those in the dye molecule structure in the polymer and polymer additives in the printing coating. According to the principle of similar compatibility, the polymers in the printing and coating will form an extraction effect on the dye single molecules, resulting in the quality problem of color bleeding on the prints. Therefore, it is necessary to determine whether a dark fabric is suitable for heat transfer printing before printing.

[0004] The traditional method for determining whether a dark fabric is suitable for heat transfer printing is to attach a layer of white cotton cloth to the printing surface, press it at high temperature for a certain time, and observe whether the cotton cloth is stained. If the staining is obvious, it indicates that there is a problem of color bleeding on the print. This method takes a long time and has a high detection cost. Summary of the Invention

[0005] The purpose of this application is to overcome the above problems existing in the background art, and provide a method for determining whether a dark fabric is suitable for heat transfer printing with high speed and low cost.

[0006] To achieve the above purpose, the following technical solutions are adopted:

[0007] A method for determining whether a dark fabric is suitable for heat transfer printing is to soak the dark fabric in an ethanol solution with a concentration of 75%, then take it out, and determine whether the dark fabric is suitable for heat transfer printing according to the degree of color change of the ethanol solution.

[0008] Furthermore, the ethanol solution soaked with the dark fabric is compared and rated with the 75% ethanol solution that has not been soaked with the dark fabric.

[0009] Furthermore, the soaking time of the dark fabric in the ethanol solution with a concentration of 75% is 5 minutes.

[0010] Furthermore, a grey scale for assessing staining is used to compare and grade the color change degree of the ethanol solution. Dark fabrics with a rating less than 3 are not suitable for heat transfer printing, while dark fabrics with a rating greater than or equal to 3 are suitable for heat transfer printing.

[0011] Compared with the prior art, the above solutions have the following beneficial effects:

[0012] In the first technical solution, the present invention soaks the dark fabric in the ethanol solution with a concentration of 75% and then takes it out. Whether the dark fabric is suitable for heat transfer printing is judged according to the color change degree of the ethanol solution. The molecular structures of disperse dyes, printing coatings, and the ethanol solution with a concentration of 75% all have similar groups. According to the principle of similar compatibility, the ethanol solution with a concentration of 75% can dissolve disperse dyes. The dissolution of disperse dyes in the dark fabric into the ethanol solution with a concentration of 75% will cause the ethanol solution to change color. If the color change degree of the ethanol solution is greater than the preset value, it indicates that the degree of dissolution of the disperse dye in the ethanol solution with a concentration of 75% is large, and the degree of compatibility of the disperse dye with the printing coating is also large, and this fabric is not suitable for heat transfer printing. The ethanol solution with a concentration of 75%, compared with ethanol solutions of other concentrations, if it changes color after extracting the disperse dye from the dark fabric, the color after the change is similar to that of the dark fabric, which is conducive to judging whether the dark fabric is suitable for heat transfer printing. The ethanol solution with a concentration of 75% has a low cost, which can reduce the cost of judging whether the dark fabric is suitable for heat transfer printing. The ethanol solution with a concentration of 75% does not produce toxic and harmful substances to the human body, improving the safety of detection.

[0013] In the second technical solution, a comparative rating is made between the ethanol solution soaking the dark fabric and the ethanol solution with a concentration of 75% that has not soaked the dark fabric. By comparing and rating the ethanol solutions that have soaked the dark fabric and those that have not, the degree of dissolution of the disperse dye in the fabric in the ethanol solution can be judged, and the degree of compatibility between the dark fabric and the printing can be judged, so as to judge whether the dark fabric is suitable for heat transfer printing. The judgment method is convenient and fast.

[0014] In the third technical solution, the soaking time of the dark fabric in the ethanol solution with a concentration of 75% is 5 minutes. After the dark fabric is soaked in the ethanol solution with a concentration of 75% for 5 minutes, the color change of the ethanol solution is not significant. The present invention only needs to soak for 5 minutes to carry out the rating, with a short detection time and high efficiency.

[0015] In the fourth technical solution, a gray scale for assessing staining is used to compare and rate the degree of color change of the ethanol solution. Dark fabrics with a rating less than 3 are not suitable for heat transfer printing, while dark fabrics with a rating greater than or equal to 3 are suitable for heat transfer printing. The ethanol solution used to soak the dark fabric and the 75% ethanol solution without soaking the dark fabric are compared and rated using a gray scale for assessing staining. The comparison and rating take a short time and have high accuracy.

[0016] The ethanol solution with a rating less than 3 has a large degree of color change, and the dark fabric soaked in it is not suitable for heat transfer printing. The molecular structures of disperse dyes, printing coatings, and 75% ethanol solution all have similar groups. According to the principle of similar solubility, the 75% ethanol solution can dissolve disperse dyes. Then the printing coating can also dissolve disperse dyes, indicating that this dark fabric is not suitable for heat transfer printing. Moreover, the 75% ethanol solution has a high concentration and strong solubility, and it can determine whether the fabric is suitable for heat transfer printing in a short time, improving the judgment speed and reducing the judgment cost.

[0017] The ethanol solution with a rating greater than or equal to 3 has a small degree of color change, and the dark fabric soaked in it is suitable for heat transfer printing. The molecular structures of disperse dyes, printing coatings, and 75% ethanol solution all have similar groups. According to the principle of similar solubility, the 75% ethanol solution can dissolve disperse dyes. However, through this judgment method, the 75% ethanol solution cannot dissolve disperse dyes because the fabric and disperse dyes have undergone process treatment during the dyeing process, making the 75% ethanol solution unable to dissolve disperse dyes. The 75% ethanol solution has a high concentration, and its ability to dissolve disperse dyes is stronger than that of the printing coating. Since the 75% ethanol solution with high solubility cannot dissolve disperse dyes, the printing coating with low compatibility cannot dissolve dyes either. Therefore, dark fabrics with a rating greater than or equal to 3 are suitable for heat transfer printing.

[0018] This method for judging whether a dark fabric is suitable for heat transfer printing takes a short time, has low cost, and is convenient for judging whether a dark fabric is suitable for heat transfer printing through a unified method. Detailed implementation mode

[0019] In the claims and the specification, unless otherwise defined, the terms "first", "second", or "third", etc., are used to distinguish different objects, rather than to describe a specific order.

[0021] In the claims and the specification, unless otherwise defined, the terms "fixed connection" or "fixedly connected" should be understood in a broad sense, that is, any connection method without displacement relationship and relative rotation relationship between the two, that is, including non-removable fixed connection, removable fixed connection, being integrated into one body, and being fixedly connected through other devices or components.

[0022] In the claims and the specification, unless otherwise defined, the terms "comprising", "having" and their variants mean "including but not limited to".

[0023] In the claims and the specification, unless otherwise defined, the term "provided with" means that the technical feature located after it is a part of the technical feature located before it.

[0024] The technical solutions in the embodiments are described clearly and completely below.

[0025] This embodiment provides a method for judging whether a dark fabric is suitable for heat transfer printing.

[0026] It includes the following steps:

[0027] Step 1: Cut a regular fabric to be tested. The sample of the fabric to be tested should be more than 150 mm away from the cloth edge, avoiding wrinkles and defects, and the size of the fabric to be tested is 100 mm * 80 mm.

[0028] Step 2: Place 50 mL of 75% ethanol solution in the first colorimetric tube as the reference solution.

[0029] Step 3: Put the fabric to be tested into a beaker, measure 100 mL of 75% ethanol solution with a measuring cylinder and pour it into the beaker, and gently stir the fabric to be tested with a glass rod to completely immerse the fabric to be tested.

[0030] Step 4: After the fabric to be tested is soaked for 5 minutes, take out the fabric to be tested. Transfer 50 mL of the concentrated solution in the beaker that has soaked the fabric to be tested to the second colorimetric tube.

[0031] Step 5: Under the D65 standard light source, with a three-layer standard friction white cotton cloth as the background, place the reference solution in the first colorimetric tube and the concentrated solution in the second colorimetric tube side by side on the white cotton cloth, and place the gray scale next to the colorimetric tubes. By moving the perforated cardboard, compare and rate the different grays on the gray scale with the lightness changes of the solutions in the two colorimetric tubes.

[0032] Through this judgment method, various fabrics are tested experimentally, and the experimental results are shown in the following table.

[0033]

[0034]

[0035] Fabrics soaked in ethanol solution with a rating level less than 3 will show printing color bleeding after being placed in a normal temperature environment for a period of time, and they belong to dark fabrics that are not suitable for heat transfer printing. Fabrics soaked in ethanol solution with a rating level greater than or equal to 3 will not show printing color bleeding after being placed in a normal temperature environment for a period of time, and they belong to dark fabrics that are suitable for heat transfer printing.

[0036] The descriptions of the above specification and embodiments are used to explain the protection scope of this application, but do not constitute a limitation on the protection scope of this application.

Claims

1. A method for determining whether a dark fabric is suitable for heat transfer printing, characterized in that, Take out the dark fabric after soaking it in an ethanol solution with a concentration of 75%, and judge whether the dark fabric is suitable for heat transfer printing according to the degree of color change of the ethanol solution.

2. The method for determining whether a dark fabric is suitable for heat transfer printing according to claim 1, characterized in that, Compare and rate the ethanol solution that has soaked the dark fabric with the ethanol solution with a concentration of 75% that has not soaked the dark fabric.

3. The method for judging whether a dark fabric is suitable for heat transfer printing according to claim 2, characterized in that, The time for soaking the dark fabric in the ethanol solution with a concentration of 75% is 5 minutes.

4. The method for judging whether a dark fabric is suitable for heat transfer printing according to claim 3, characterized in that, Use a gray scale for assessing staining to compare and rate the degree of color change of the ethanol solution. Dark fabrics with a rating less than 3 are not suitable for heat transfer printing, and dark fabrics with a rating greater than or equal to 3 are suitable for heat transfer printing.

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