Improper sealing is one of the common Failure causes of
cup filling sealing machine. Improper sealing has three meanings:
① The seal of the bag can not be sealed;
② Under the action of sealing knife pressure, although the mouth of the bag is sealed, but a little hard squeezing or ripping, the sealing will crack;
③ When peeling test is carried out on the sealing interface, half of the sealing is firm and half is separated. The sealing quality of such a packing bag is still unqualified, because the contents are easy to miss in the process of storage and transportation after extrusion. This situation in the compound material for OPP, blow molding PE often appear.
The reasons for the first failure cause
of cup filling sealing machine are as follows.
(1) The heat sealing temperature is not enough.
Under normal circumstances, when the total thickness of OPP composite bag is 80 ~ 90μm, the heat sealing temperature should reach 170 ~ 180℃. When the total thickness of PE composite bag is 85 ~ 100μm, the temperature should be controlled at 180 ~ 200℃. As long as the total thickness of the bag increases, the heat sealing temperature must be increased accordingly.
(2) The heat sealing speed is too fast.
Sealing is also related to the speed
of cup filling sealing machine. If the speed is too fast, before the sealing interface has time to heat, the traction roller is transferred to the cold pressing place for cooling treatment, naturally can not meet the quality requirements of heat sealing.
(3) The pressure of the cold press rubber wheel is not appropriate.
There is one up and down the cold press rubber wheel, and the pressure between them should be moderate. When adjusting the pressure, only the spring can be clamped.
(4) There is a problem with the quality of heat sealing film.
The sealing is also related to the quality of the heat sealing film. If the corona treatment of the composite material is not uniform, and happens to appear in the sealing interface, it must not be sealed. Such cases are rare, but when they do occur, the product is doomed.
In short, to solve the problem of the first kind of improper sealing, generally improve the heat sealing temperature, reduce the heat sealing speed, and increase the pressure of the cold press rubber wheel.
The main reasons for the second Failure cause
of cup filling sealing machine are as follows.
(1) The heat sealing temperature is not enough.
The problem can be solved only by increasing the heat seal temperature appropriately.
(2) The knife surface of the heat sealing knife is not smooth enough.
The main reason is that the middle screw is installed inclined, not level; Or the pressure spring pressure of the heat sealing knife is uneven.
