As a common environmentally friendly shopping bag, the printing process of non-woven vest bag has unique requirements and challenges, and maintaining color vividness is crucial to enhance product appeal.
First, the material characteristics of non-woven fabrics bring many difficulties to printing. Unlike traditional printing materials such as paper, the surface of non-woven fabrics is relatively rough and the fiber structure is loose, which makes the ink adhere poorly to its surface. For example, during the printing process, the ink easily penetrates into the gaps between the fibers, resulting in blurred edges and uneven colors of the pattern. Moreover, the ink absorption of non-woven fabrics is unstable. Different batches of non-woven fabrics may absorb different amounts of ink due to differences in fiber composition, density, etc., making it difficult to accurately control the concentration and effect of printed colors. In addition, the flexibility and elasticity of non-woven fabrics will also affect the printing accuracy. They may deform under the action of printing pressure, further destroying the integrity of the pattern.
Secondly, in order to overcome these difficulties and maintain color vividness, the selection and deployment of inks are key links. It is necessary to select inks specifically for non-woven fabrics. Such inks usually have higher viscosity and adhesion, and can better adhere to the surface of non-woven fabrics. When mixing ink, the base color and ink absorption characteristics of non-woven fabrics should be fully considered, and the drying speed, fluidity and color saturation of the ink should be adjusted by adding appropriate additives. For example, adding an appropriate amount of desiccant can speed up the drying of ink on non-woven fabrics and reduce color bleeding; while adding thickeners can improve the rheology of inks, making it easier to control printing thickness and uniformity, thereby enhancing the vividness and layering of colors.
Furthermore, the optimization of printing equipment and process parameters plays an important role in ensuring printing quality. Advanced flexographic printing or digital printing equipment should be used, which can more accurately control printing pressure, ink volume and printing speed. During the printing process, according to the material and thickness of the non-woven fabric, the printing pressure should be reasonably adjusted to avoid excessive pressure causing pattern deformation or too little pressure causing ink to not adhere firmly. At the same time, the ink volume should be accurately controlled to ensure that the ink supply of each printing unit is uniform and stable to achieve color consistency. In addition, for multi-color printing, attention should be paid to the accuracy of color registration, and through strict equipment calibration and quality inspection, it should be ensured that inks of different colors can be accurately superimposed together to present clear and bright patterns.
Finally, post-processing is also essential to improve the durability of color brightness. After printing, the non-woven vest bag can be laminated or glazed. Lamination can form a protective film on the surface of the pattern, which not only enhances the glossiness of the color, but also effectively prevents the ink from fading due to friction, sunlight and other factors. Glazing can make the pattern brighter and improve its wear resistance and water resistance. Through these post-processing processes, the retention time of the color brightness on the non-woven vest bag can be significantly extended, so that it can still attract consumers' attention during long-term use and enhance the market competitiveness of the product.
