The surface flatness of thermal transfer paper is one of the key factors affecting the accuracy of pattern transfer and is of great significance to the quality of the final product.
First, poor surface flatness will lead to uneven distribution of ink during the transfer process. If the surface of thermal transfer paper is uneven, it is difficult for the ink to adhere evenly to the object to be transferred according to the predetermined pattern shape during transfer. For example, the raised part may cause ink accumulation, while the depressed part may cause ink loss, resulting in blurring, ghosting or color discontinuity of the transferred pattern, which seriously affects the clarity and integrity of the pattern.
Second, it affects the uniformity of transfer pressure. When the surface of thermal transfer paper is uneven, when the transfer equipment applies pressure, the pressure cannot be evenly applied between the paper and the object to be transferred. This may cause excessive pressure in some areas, causing excessive transfer of the pattern, while insufficient pressure in other areas causes incomplete transfer, thereby reducing the accuracy and consistency of pattern transfer.
In order to improve the surface flatness of thermal transfer paper, a variety of measures can be taken during the production process. First, optimize the papermaking process in the papermaking process, strictly control the uniformity of the pulp and the distribution of the fibers, and reduce the surface unevenness caused by fiber agglomeration or uneven distribution. Through advanced headbox technology and screening equipment, ensure the stability and uniformity of the pulp during the forming process.
In addition, adopt appropriate post-processing processes. For example, the surface flatness of thermal transfer paper can be effectively improved by calendering. During the calendering process, the paper is squeezed by a series of rollers under high temperature and high pressure, making the fibers on the surface of the paper more compact and flat, thereby improving its surface finish and flatness. However, it is necessary to control the pressure and temperature of calendering to avoid excessive calendering that may damage other properties of the paper.
In addition, the selection of raw materials is also crucial. The selection of high-quality pulp raw materials with relatively uniform fiber length and strength can lay a good foundation for the production of thermal transfer paper with a smooth surface. At the same time, adding appropriate fillers and additives to the paper formula can help improve the forming performance and surface characteristics of the paper and further improve the flatness.
During storage and transportation, it is also necessary to avoid the thermal transfer paper from being affected by adverse factors such as squeezing and moisture. Appropriate packaging and storage environment can maintain the flatness of the paper and prevent it from deforming before use.
The surface flatness of thermal transfer paper has a significant impact on the accuracy of pattern transfer. By taking corresponding improvement measures in production, raw material selection, storage and transportation, the surface flatness of thermal transfer paper can be effectively improved, thereby improving the accuracy of pattern transfer and meeting the market demand for high-quality thermal transfer products.
