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What are the Conditions of POF Shrink Film Heat Seal Strength?

May. 07, 2020

As a POF Shrink Film Manufacturer, share with you. With the rapid development of food, cosmetics, medicine and other industries, the demand for plastic composite packaging products is increasing, and the quality requirements for plastic composite packaging products are also increasing. Packaging users not only pay attention to the aesthetics and logistics performance of packaging products, but also the heat sealing strength of packaging products. Because the heat sealing strength of the packaged products directly affects the packaging speed, transportation and sales.

POF Shrink Film

POF Shrink Film

Features of POF Shrink Film

Heat shrinkable film is used for sales and transportation of various products, its main role is to stabilize, cover and protect products. The shrink film must have high puncture resistance, good shrinkage and a certain shrinkage stress. During the shrinking process, the film cannot create holes. Since shrink film is often suitable for outdoor use, it is necessary to add UV anti-ultraviolet agent.

In actual production, each manufacturer, whether it is a bag-making product or a coiled product used in an automatic packaging production line, takes heat seal strength as a most important quality indicator to control. Tianjin shrink film analysis The following combined with the actual production experience, make a simple analysis of the factors that affect the heat seal strength of the heat shrink film:

1. Heat sealing temperature: The heat sealing temperature directly affects the heat sealing strength of the plastic composite packaging product.

2. Heat sealing time: The heat sealing time of automatic packaging machine or old-fashioned bag making machine is determined by the speed of the machine. In the case where the heat sealing temperature and the heat sealing pressure are unchanged, the longer the heat sealing time, the stronger the bonding between the heat sealing layers. However, if the heat sealing time is too long, wrinkles and unevenness will occur in the heat sealing part of the composite film, which seriously affects the appearance quality of the product.

3. Heat sealing pressure: In order to ensure the heat sealing strength of plastic composite flexible packaging, a certain heat sealing pressure is indispensable. Therefore, the heat sealing pressure is required to be moderate and uniform during the heat sealing process. If the heat sealing pressure is not enough or uneven, it will cause bubbles in the heat sealing part and virtual welding, resulting in poor heat sealing.

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