What Are The Factors That Affect The Heat Seal Strength Of PETG Shrink Film With High Shrinkage?

First, heat sealing time: The heat sealing time of the automatic packaging machine or the old bag making machine is determined by the machine speed. In the case where the heat sealing temperature and the heat sealing pressure are constant, 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 may occur in the heat-sealed portion of the PETG Shrink Film With High Shrinkage, which seriously affects the appearance quality of the product.

Second, heat sealing pressure: In order to ensure the heat sealing strength of plastic composite flexible packaging, a certain heat sealing pressure is essential. Therefore, the heat sealing pressure is required to be moderate and uniform during the heat sealing process. If the heat sealing pressure is insufficient or uneven, bubbles will be generated in the heat-sealed portion and the welding will be performed, resulting in poor heat sealing.

Third, heat sealing temperature: heat sealing temperature directly affects the heat sealing strength of plastic composite packaging products.

Once the adhesive of the High Shrinkage PETG Shrink Sleeves Film is applied, the solvent will quickly evaporate before it enters the dryer oven. However, due to the volatilization and heat absorption, the surface temperature of the rubber layer is lowered, and the volatilization speed is also lowered. When the protective film enters the oven, the heat absorbed by the solvent volatilization is supplemented by the heat conducted from the outside, and when the heat reaches equilibrium, the rubber layer is The surface temperature and the evaporation rate of the solvent can also be kept constant.