(1) Thermal seal temperature is not enough
Usually, with OPP as the compound bag, when the total thickness of the bag is 80, the heat sealing temperature should reach 170, and the temperature should be controlled in the 180 when the total thickness of the bag of PE is 85 100. As long as the total thickness of the bag has increased, the heat seal temperature must be correspondingly improved.
(2) Hot sealing speed too fast
The sealing is also related to the speed of the sealing machine. If the speed is too fast, the sealing place has not yet been able to heat the traction roller transmission to the cold pressure place for cooling treatment, the nature of the thermal seal quality requirements.
(3) Cold pressure tire pressure is not suitable
Cold pressure rubber wheel up and down each has a moderate pressure between them to adjust the pressure when only clamping the spring.
(4) The quality of hot-sealing film
Sealing seal is also related to the quality of hot-sealing film, if the composite material corona treatment is not uniform, the effect is not good, and happens to be in the sealing place, certainly can not be sealed. This situation is rare, but once it does, the product must be scrapped. So in the color printing packaging industry, is the next procedure to supervise the process, a quality problem, we must timely analyze the cause and solve. If the seal is water, dirty, it will also cause sealing is not secure.
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