Gold foil paper, scientific name anodized aluminum, was initially used only in the paper printing industry. With the advancement of science and technology and people's preference for high-end luxury metal shiny jewelry, it has been widely used in packaging, books, plastics, wood, fashion, leather, wallpaper and other products, making the products colorful and more elegant and refined. The luxury is the finishing touch and highlights the design theme. Due to different substrates, the performance of the bronzing paper used is also different. To ensure the quality of bronzing, you must understand the structure and performance of the bronzing paper, choose the bronzing paper and the production process correctly, and meet the quality requirements. 1. Bronzing paper structure The structure of commonly used foil paper includes the following functional layers: 1. Film base layer: It is composed of polyester film or polyester film and supports other layers. 2. Peeling layer: It is composed of silicone resin. When hot stamping, the coloring material, aluminum and adhesive layer can be quickly separated from the polyester film and transferred to the surface of the object to be stamped. 3. Dyeing layer: mainly composed of synthetic resin and dye, forming the color of bronzing paper, such as red, blue, green, gold, etc. 4. Aluminized layer: It is formed by metal aluminum after vacuum high temperature evaporation, cooling and deposition. The main function of the aluminized layer is to reflect light and make the dyed layer appear metallic. 5. Adhesive layer: It is mainly composed of thermoplastic resin, and its role is to bond the aluminized layer and the dyeing layer to the object to be scalded under the action of pressure and temperature. 2. Selection of bronzing paper Because the materials used in bronzing paper are numerous and the process is complex, the quality of bronzing paper on the surface is very different. The first is the adhesive layer. Different resins are used according to the substrate of the hot stamp. For hot stamping on plastic, you must use gold foil paper with adhesive layer suitable for hot plastic; hot stamping PVC tablecloths, gold foil paper adhesive layer must be able to firmly adhere the aluminized layer and the dyeing layer under low pressure Knot on PVC tablecloth; the foil layer on the side of the book, the glue layer must be thicker, and the adhesion is very good. Under normal circumstances, one of the main reasons for the phenomenon of inferiority is that the adhesive layer is not compatible with the hot stamping substrate. The second is the scope of application of the peeling layer. Good quality has a wide range of application, and small lines of text patterns or large-area patterns can be well peeled; otherwise, it is not. The leather full-page full transfer hot stamping requires that no fine trachoma appear in the full-page, and the peeling layer should be a special peeling layer with all the continuous sheets separated. Third, the better the vacuum aluminum plating machine for making the aluminum layer, the higher the metal gloss of the foil paper. Fourth, good quality gold foil paper has a constant color, is resistant to ultraviolet light, and the color of poor quality gold foil paper varies from batch to batch, and some will change color in a few hours under sunlight. Fifth, the chemical raw materials used in foil paper are different, and the content of harmful ingredients is also different. Some bronzing paper can not meet the EU ROHS (sgs) testing standards, and some can be used for children's toys hot stamping and food packaging with stricter environmental protection requirements. Sixth, the choice of base film. Good film has the properties of anti-stretch and instantaneous high temperature resistance, and is suitable for various production processes. At the same time, different substrates also have different requirements for the thickness of foil paper. The general thickness varies from 12μm to 25μm. In summary, when choosing bronzing paper, users must choose qualified bronzing paper according to the characteristics and requirements of their own hot stamping products, instead of blindly pursuing low prices, which will eventually lead to a large number of waste products or all scrapped. 3. Selection of hot stamping process parameters 1. Temperature: Hot stamping temperature has a great influence on the quality of hot stamping. If the temperature is too low, the peeling layer and adhesive layer of the gold foil paper are not melted sufficiently, and the disadvantage that the hot stamping is not good or the hot stamping is not strong. If the temperature is too high, there will be paste, foaming, metal aluminum oxidation and loss of gloss. Therefore, the hot stamping temperature should be comprehensively considered according to the types of hot stamping paper, hot stamping objects (paper, plastic, cloth, leather, etc.), hot stamping patterns and other factors. 2. Pressure: the stamping pressure should not be too large or too small. If the pressure is too low, the adhesion between the bronzing layer and the substrate is poor, and the bronzing paper is not peeled off sufficiently, which causes the bronzing imprints to bloom; if the pressure is too large, it will cause uneven marks on the surface of the paste and substrate. At the same time, the size of the stamping pressure should be considered together with the stamping temperature. 3. Hot stamping speed: In general, slow stamping speed means good adhesion, but hot stamping speed is too slow, which affects the production progress. The hot stamping speed is too fast, the contact time between the foil paper and the substrate is short, the adhesive layer and the peeling layer are not fully melted, which makes the peeling difficult and the adhesion to the substrate is not strong. Therefore, the hot stamping speed should be appropriate. At the same time, the stamping speed must be compatible with the stamping pressure and temperature. Good bronzing paper, suitable for high-speed bronzing machine. Abs Frame Bag Filter,Pre Filter Bag,Pocket Pre Filter,Filter Bag Abs Frame Ningbo Ifilter Purification Equipment CO.,Ltd. , https://www.aifilterparts.com