How to identify thermal sublimation transfer paper

The following are some opinions on how to judge the quality of digital thermal sublimation transfer paper for users and peers to discuss together.

1. Transfer rate: Transfer rate is a basic performance of transfer paper and a feature that distinguishes it from ordinary inkjet paper. A good transfer rate can make the color of the transferred object more vivid and save ink. At present, there is no transfer rate detection standard in China, and domestic transfer paper manufacturers generally do not have this enterprise standard. The enterprise standard is the ratio of the whiteness of the transfer paper before and after the transfer of the specified ink color under standard transfer conditions.

2. Ink compatibility: As a transfer paper manufacturer, the transfer paper produced is required to adapt to various transfer inks as much as possible, so that the transfer paper coating has appropriate solubility for various sublimation inks, so that the ink pattern can be delicately reflected on the transfer paper without penetrating the coating to the bottom paper, causing a low transfer rate.

3. Drying speed: Fast drying speed undoubtedly makes it convenient for users to use, and can facilitate continuous printing and increase delivery speed. Printing speed is also a parameter that transfer paper manufacturers use to track the increasing printing speed of printers. The current drying speed comparison of world-renowned transfer paper manufacturers is as follows: (surface moisture meter method)
Netherlands (Jetcool quick-drying paper) 6 points South Korea (Han Song) 11 points China (quick-drying paper) 7 points (ordinary paper) 19 points
A Chinese company 3 points (However, the transfer rate is very low and the surface is rough and cannot be used.)

IV. Warping and warping time: Transfer paper is a coated paper. The expansion and contraction rate of the coating layer and the base paper under drying and high temperature is inconsistent, which will cause single-sided warping. When the transfer paper warps, it will cause the following operational inconveniences:
1. Inconvenient paper feeding in the printer. (Warping at room temperature drying) 2. When printing in large quantities and stacking, it is inconvenient to sort due to warping. (Warping at room temperature drying) 3. Transfer failure due to misalignment with the fabric due to the warping of the transfer paper before thermal transfer. (Warping under normal temperature drying) 4. Under the heat transfer ironing plate, the transfer paper will be warped and curled up, which will cause the transfer to be misaligned and cause the transfer to fail. (High temperature warping) At present, the products produced by various transfer paper factories at home and abroad have different degrees of warping. The transfer paper with excellent quality has a small warping angle and slow warping, which can meet the flatness and time requirements of the printing transfer production process and is easier to operate.
Overcoming warping is a difficult problem that transfer paper manufacturers have worked together to overcome. The double-sided coating method can effectively improve the warping, but this increases the production cost. Most domestic transfer paper production equipment often does not have such conditions, and can only be improved from the coating formula and production process.

5. Printing wrinkles and wipes the nozzle: Inkjet transfer paper requires the paper surface to be wrinkled as little as possible. If the wrinkles are serious during printing, the paper may arch and wipe the nozzle, especially when the paper surface is rough, which is more likely to damage the delicate nozzle (some companies add rough inorganic powder to the coating formula to reduce costs, making the transfer paper surface like sandpaper.). The way to reduce the wrinkling of transfer paper is mainly to start with the base paper. The smaller the wrinkles of the base paper, the smaller the wrinkles of coating and printing. The second is to improve the coating formula to achieve the purpose of reducing wrinkles. The transfer paper coating formula uses nanomaterials to ensure that the surface smoothness of the transfer paper is more than 3 seconds and will not damage the nozzle.

6. Impurity spots on the paper surface: The spots (impurity points) on the transfer paper surface are an important indicator of transfer paper. These spots may be generated from the base paper, the coating or the production process. The spots seriously harm large-area solid color printing but have little effect on fancy printing. Domestic transfer paper generally has the problem of spots. Suzhou Quanjia Company has done a lot of research and investigation on the elimination of spots, and has made many efforts on the generation and elimination of spots. From base paper to coating formula and production process, there are strict regulations and control, but there may still be 1-2 spots per square meter. With the commissioning of new formulas and equipment transformation, it is expected that the elimination of spots will reach the international advanced level.

VII. Stability of quality: Stable quality is an important indicator of usability. The surface quality of transfer paper is closely related to the user's ink, print data settings, and transfer machine parameter settings. The fluctuation or constant change of the surface quality of transfer paper will force the end user to follow the adjustment, such as the original color calibration needs to be redone, and the printing samples that have been provided to customers cannot be reproduced and can only be redone, etc. Therefore, the end customer needs stable quality. Transfer paper manufacturers must attach great importance to this, because only stable quality can win a group of loyal customers.

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