The validity of the method for testing and judging the heat sealing strength of suction bag
① The correct way to close the bag is to close the bamboo strips with the direction of 20-30mm.
② The inner side of the sealing edge shall not be able to tear with a width of more than 2 mm. Otherwise, the strength of the suction nozzle bag is qualified when tested, but the heat sealing layer is not completely integrated together, which leads to the decrease of sealing strength of suction nozzle bag during boiling and the phenomenon of broken bag after boiling. When the bag is separated from the interface of the two inner PE layers on the sealing edge after boiling, it belongs to the problem that the heat sealing edge is not firm.
Expanding knowledge: influence of temperature and air volume in drying oven
The faster the temperature in the drying oven is, the faster the solvent volatilizes. However, if the temperature is too high, the printing film will stretch. Therefore, the temperature is generally set at 45 ~ 65 ℃ for hierarchical printing and 75 ~ 90 ℃ for large area printing. The inlet air pressure and exhaust air pressure of drying oven are not the greater the better, but the inlet air volume and exhaust air volume should be balanced. If the exhaust air volume is too large, the film will be broken or the ink layer will be scratched. Generally, the inlet air pressure of drying oven is 80 ~ 90h2 ­ o, and the exhaust pressure of suction nozzle bag is 40 ~ 50 H2 ­ o. www.dgbpk.com/
Dongguan Beite packaging materials Co., Ltd
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