The stronger the light intensity, the more short-wave radiation, the more long-wave radiation generated on the ground, the higher the temperature inside the heat-shrink film, and the greater the temperature difference between the inside and outside of the heat-shrink film. Therefore, the sunny day is strong and the temperature inside the heat shrinkable film is high. In the production practice, the film is often exposed to heat and shrink, and the air is cooled. The higher the temperature outside the heat shrinkable film, the less the heat transfer loss of the heat shrinkable heat shrinkable film produced by Dongguang Hengxing Plastic Co., Ltd.; the lower the temperature outside the heat shrinkable film, the more the conduction loss. Therefore, the temperature inside the heat shrinkable film is also positively correlated with the heat shrinkable film overflow. Corona treatment is usually used to increase the surface tension of the film. However, the corona method has problems such as aging, and particularly in a high-temperature, high-humidity environment, the film tension after corona treatment is easily attenuated. However, the chemical coating method does not have such a problem, so it is favored by the printing industry and the aluminum plating industry.
The main function of pvc heat shrinkable film is to stabilize, cover and protect the product. The shrink film must have high puncture resistance, good shrinkage and certain shrinkage stress. The film does not create holes during shrinkage. Since the shrink film is often used outdoors, it is necessary to add a UV anti-UV agent.
The heat shrinkable film is widely used in the whole collection packaging of wine, cans, mineral water, various beverages, cloth and other products. The product has good flexibility, strong impact resistance, tear resistance, not easy to break, not afraid of tide. The shrinkage rate is large; the product is wrapped by the retracting force after stretching of the stretched film to form a compact, space-saving unit, so that the trays of the product are tightly wrapped together, which can effectively prevent transportation. The products are misaligned and moved, and the adjustable tensile force can make the hard products close to each other, making the soft products tight, especially in the tobacco industry and the textile industry. The shrink film has good wear resistance and high strength, ensuring the weight of the contents. The printing belongs to the film printing (the image is in the film sleeve), which can protect the imprint and the label wear resistance is more Good. Heat shrinkable packaging has good sealing, moisture-proof, anti-fouling, anti-rust effect, can extend the shelf life of food, easy to store, easy to stack in the open air, save warehouse area. Heat shrink packaging process and equipment are simple, heat sealing is good , labeling does not require the use of adhesives.