What are the common faults of packaging machinery?

1. The seal is not firm
Unsecure sealing is one of the common faults of continuous sealing machine. Unsecure sealing has three meanings: ① the sealing part of the packaging bag cannot be sealed; ② Under the pressure of the sealing knife, although the bag mouth is sealed, it will crack again if it is squeezed or peeled slightly; ③ During the peeling test on the sealing part, half of the sealing part is firmly sealed and half of the sealing part is separated. The sealing quality of such packaging bag is still unqualified, because the contents are easily missed after being squeezed during storage and transportation. This situation often occurs when the composite lining is OPP or blown PE.
The main reasons for the first failure are as follows.
(1) Insufficient heat seal temperature
Generally, for the composite bag with OPP as the lining, when the total thickness of the bag is 80~90 μ M, the heat sealing temperature shall reach 170~180 ℃; The total thickness of composite bag with PE as lining is 85~100 μ M, the temperature should be controlled at 180~200 ℃. As long as the total thickness of the bag is increased, the heat sealing temperature must be increased accordingly.
(2) The heat sealing speed is too fast
Failure to seal is also related to the speed of the sealing machine. If the speed is too fast, the sealing area will be transported to the cold pressing area for cooling treatment by the traction roller before it can be heated, which will naturally fail to meet the quality requirements of heat sealing.
(3) Improper pressure of cold-pressed rubber wheel
There is one cold pressing rubber wheel at the top and one at the bottom, and the pressure between them should be moderate. When adjusting the pressure, just clamp the spring.