POF shrink film is a new type of packaging material, which is one we can often use. Its use is rapidly spread and supported by the majority of users, which is inseparable from its good performance. When using it, we found that its heat seal strength will be affected by some factors, then we will introduce it in detail below.
1. 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 of constant heat sealing temperature and heat sealing pressure, the longer the heat sealing time, the stronger the bonding between the heat sealing layers. However, if the heat sealing time is too long, wrinkling and unevenness will occur in the heat sealing part of the POF shrink film, which seriously affects the appearance quality of the product.
2. Heat sealing pressure: To ensure the heat sealing strength of the product, a certain heat sealing pressure is essential. Therefore, heat sealing pressure is required to be moderate and uniform during the heat sealing process. POF shrinks film manufacturers particularly remind everyone that if the heat sealing pressure is insufficient or uneven, it will cause bubbles in the heat sealing part of the product, resulting in poor heat sealing.
3. Heat sealing temperature: The heat sealing temperature directly affects the heat sealing strength of the shrink film. This is also an important place that needs our attention.
The above is the analysis of the reasons that affect the heat sealing strength of the POF shrink film. This is mainly because the heat sealing time is longer, the heat sealing pressure is relatively large, and the temperature of the heat sealing will also affect the heat sealing strength of the product. Therefore, for a product to maintain its performance and achieve good results, we need to control these factors.