In the process of shrink packaging, some problems are often encountered, such as flatulence, atomization, and fish eyes of the shrink film. These problems can be corrected by adjusting the machine settings. The most frequently adjusted packaging machine temperature, circulating wind speed, conveyor belt speed, number of ventilation holes and shrink film size.

Swell: hot air remains in the shrink film

Solution: 

Increase the number of vents to speed up air leakage from the shrink film.

Slow down the conveyor belt speed of the packaging machine, so that the hot air has a longer time to leak from the shrink film.

Increase the temperature of the packaging machine to help air leak from the shrink film.

Atomization: The surface of the shrink film becomes fuzzy, like mist

Solution:

Lower the temperature of the packaging machine. 

Excessive temperature is the cause of the shrink film atomization.

Increase the conveyor belt speed of the packaging machine to reduce the time that the shrink film is exposed to heat.

Weak sealing line: The sealing line of the shrink film is easily damaged or small holes appear.

Solution:

Lower the temperature of the heat sealing knife of the sealing machine.

The height of the sealing line is incorrect, the height of the sealing line should be half of the height of the package.

The pressure of the sealing frame is uneven, although the horizontal position of the sealing frame should be adjusted.

The heat sealing knife or sealing base may be dirty, clean the heat sealing knife or sealing base.

The thermal insulation pad or thermal insulation sticker of the sealing base is damaged, the thermal insulation pad or thermal insulation sticker can be replaced.

The sealing time is too short, and the sealing pressure disappears before the sealing line is completely integrated. The sealing time can be adjusted longer.

Fisheye: Fisheye-like wrinkles appear on the surface of the shrink film

Solution:

The temperature of the shrink packaging machine is too low, you can increase the temperature of the packaging machine.

The speed of the conveyor belt of the shrink packaging machine is too fast, so the speed of the conveyor belt can be reduced.

The circulating wind force of the shrink packaging machine is too low, you can increase the circulating wind force.

Crow's feet: A series of wrinkles appear on the corners and edges of the shrink film

Solution:

Too many vent holes on the shrink film, causing air to leak out of the shrink film too quickly, and the shrink film cannot fully shrink, reducing the number of vent holes.

The speed of the conveyor belt of the shrink packaging machine is too fast, so the speed of the conveyor belt can be reduced.

The temperature of the shrink packaging machine is too low, you can increase the temperature of the packaging machine.

The circulating wind force of the shrink packaging machine is too low, you can increase the circulating wind force.

Dog ears: the shrink film forms a protruding triangle at the corners of the package

Solution:

The shrink bag for wrapping the package is too big, so the shrink bag size can be made smaller.

The speed of the conveyor belt of the shrink packaging machine is too fast, so the speed of the conveyor belt can be reduced.

The circulating wind force of the shrink packaging machine is too low, you can lower the circulating wind force.

The temperature of the shrink packaging machine is too low, you can increase the temperature of the packaging machine.

Sealing and cutting position error: the position of the sealing line should be half of the height of the package

Solution:

The height of the conveyor belt of the sealing machine is incorrect, the height of the conveyor belt can be adjusted to a suitable position.

The height of the sealing frame is incorrect, you can adjust the height of the sealing frame to a suitable position.

The circulating wind direction of the shrink packaging machine is incorrect, and the circulating wind direction can be readjusted.

The shrink bag of the wrapped package is too large, so the shrink bag size can be reduced a bit.

Crush packaging: the packaging presses the shrink film to deform or crush

Solution:

The temperature of the shrink packaging machine is too high, you can lower the temperature.

The speed of the conveyor belt of the shrink packaging machine is too slow, you can increase the speed of the conveyor belt.

The shrink bag for wrapping the package is too small, please enlarge the shrink bag size.

The shrinkage tension of the shrink film used is too large, and it is not suitable for the packaging. Use a shrink film with lower shrinkage.

The sealing and cutting position is filamentous: filaments appear at the sealing and cutting position

Solution:

The temperature of the heat-sealing knife of the sealing machine is too low, you can increase the temperature of the heat-sealing knife.

The sealing and cutting time is too short, you can adjust the sealing and cutting time longer.