(1) The heat sealing temperature is not enough
Under normal circumstances, when the total thickness of the composite bag lined with OPP is 80 ~ 90 μm, the heat sealing temperature should reach 170 ~ 180 °C; the total thickness of the composite bag lined with PE is 85 ~ 100 μm, and the temperature should be Control at 180 ~ 200°C. As long as the total thickness of the bag is increased, the sealing temperature must be increased accordingly.
(2) The heat sealing speed is too fast
What should I do if the
cup filling sealing machine is not tightly sealed?
The inability to seal is also related to the speed of the
cup filling sealing machine. If the speed is too fast, the sealing part will be transported to the cold pressing part for cooling treatment, and then it can be heated later, which naturally fails to meet the heat sealing quality requirements.
(3) The pressure of the cold-pressed rubber wheel is not suitable
Upper and lower cold-pressed rubber wheels-one each, the pressure should be moderate. When adjusting the pressure, just clamp the spring.
(4) There is a problem with the quality of the heat sealing film
The inability to seal is also related to the quality of the heat-sealing film. If the corona treatment of the composite lining is uneven, the effect is not good, and it happens to be at the sealing place, it will definitely not be able to seal. This situation is rare, but once it happens, the product must be scrapped. Therefore, in the color printing and packaging industry, the next process is to supervise the previous process. Once a quality problem is found, the cause must be analyzed and resolved in time.
If there is moisture or dirt in the
cup filling sealing machine, the seal will not be firm.
In short, to solve the problem of the first seal is not strong, generally you can appropriately increase the heat sealing temperature, then reduce the heat sealing speed, and increase the pressure of the cold-pressed rubber wheel.
The main reasons leading to the failure of the second type of seal are as follows.
(1) The heat sealing temperature is not enough
This problem can be solved by appropriately increasing the heat sealing temperature.
(2) The surface of the heat sealing knife is not flat enough
The heat-sealing knife is divided into two pieces: upper and lower pieces, and thermocouples are usually installed in them to sense temperature transfer. There are three screws on the heat sealing knife. The screw in the middle supports and strengthens the blade.
use. The other two screws are equipped with pressure springs and gaskets, which are mainly used to adjust the pressure of the heat-sealing knife. .The upper and lower blades have two springs. . The main reason for the uneven surface of the heat-sealing knife is
The screws are installed obliquely, not horizontally; or the compression spring of the upper heat-sealing knife is uneven.
