Three common surface treatment methods for heat shrinkable film packaging

Heat shrinkable film is a relatively advanced packaging method. Heat shrinkable film packaging is widely used in food, ceramic products, tea sets, mechanical parts and other industries. Products packaged with heat shrinkable film can fully highlight the appearance and improve product Display, beauty and sense of value, while the heat shrinkable film packaging also has the characteristics of sealing, moisture-proof and pollution-proof.　　一. Heat shrinkable film structure 　 　 The film structure of heat shrinkable film packaging is similar to that of paper, the difference is that the surface of the film must be treated.　　2. Heat shrinkable film packaging surface treatment 　　 The principle of the ink layer forming patterns on the printed matter is penetration, volatilization, filming, and curing. However, due to the high film density, the ink only volatilizes and conjuncts the film, and there is no penetration during the curing process, so the surface of the heat shrinkable film packaging needs special treatment. After treatment, the surface tension of the heat shrinkable film is increased to make the heat shrinkable film greater than the surface tension of the ink, so as to achieve the correct combination of the ink and the film material.　　3. Three ways of surface treatment of heat shrinkable film packaging 　　1. Corona treatment: Discharge treatment to the surface of the film through high-voltage electric charge to achieve the purpose of strengthening the surface energy and surface tension. Corona treatment is generally carried out in the film manufacturing plant. Because the surface tension is time-limited, it is required to be strictly tested before printing. Therefore, some advanced equipment has a pre-press corona treatment device in order to print high-quality film products.　　2. Printing treatment: Use chemical methods to change the surface characteristics of the film to make it suitable for ink printing or ribbon printing.　　3. Surface coating: Use chemicals to coat the surface of the film to increase surface tension and change surface characteristics.　　GBK-1 Heat Shrinkage Tester 　　Standard GBPI's heat shrinkage tester is suitable for testing the heat shrinkage performance of various plastic films in liquid media at various temperatures.　　 heat shrink tester is suitable for various films, heat shrink tubes, pharmaceutical PVC rigid sheets, back sheets and other materials to test the heat shrinkability and dimensional stability of various materials in liquid media at various temperatures. Through the heat shrinkage test of packaging materials, it helps manufacturers to evaluate the heat shrinkability of product plastic packaging materials to control the quality of packaging products.　　 Label: p0f heat shrinkable film