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, most often the temperature of the packaging machine, the circulating air speed, the conveyor belt speed, the number of ventilation holes and the size of the shrink film.

The following will describe some common shrink packaging problems and solutions

1)Flatulence:Hot air remains inside the shrink film

solution:

Increase the number of vent holes to speed up the escape of air from the shrink film

Slow down the conveyor belt speed of the packaging machine to allow longer time for the hot air to escape from the shrink film

Turning up the temperature of the packaging machine helps the air escape from the shrink film

2) Fogging: The surface of the shrink film becomes blurred, like a mist

solution:

Turn down the temperature of the packaging machine. Too high temperature is the reason for the atomization of the shrink film. Increase the speed of the conveyor belt of the packaging machine to reduce the time that the shrink film is exposed to heat.

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

Turn down the temperature of the sealing machine heat sealing knife

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

The pressure of the sealing rack is uneven, although the horizontal position of the sealing rack needs to be adjusted

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

If 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

If the sealing time is too short, the sealing pressure will disappear before the sealing line is completely combined, and the sealing time can be adjusted longer.

4) Fish-eye: fish-eye-like wrinkles appear on the surface of the shrink film

solution:

The temperature of the shrink packaging machine is too low, the temperature of the packaging machine can be increased, the speed of the conveyor belt of the shrink packaging machine is too fast, the speed of the conveyor belt can be reduced, and the circulating air force of the shrink wrapping machine is too low, the circulating air force can be increased

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

solution:

Too many ventilation holes on the shrink film cause the air to leak too fast from the shrink film, and the shrink film fails to shrink completely, so the number of ventilation holes can be reduced. Turn it down, the temperature of the shrink packaging machine is too low, you can increase the temperature of the packaging machine, the circulating air force of the shrink wrapping machine is too low, you can increase the circulating air force

6) Dog ears: The shrink film forms a protruding triangle at the corner of the package

solution:

The shrink bag of the wrapping package is too large, the size of the shrink bag can be made smaller, the speed of the conveyor belt of the shrink packaging machine is too fast, the speed of the conveyor belt can be adjusted down, the circulating wind of the shrink packaging machine is too low, the If the circulating air force is lowered, the temperature of the shrink packaging machine is too low, and the temperature of the packaging machine can be raised

7) Wrong sealing and cutting position: the position of the sealing line should be at half the height of the package

solution:

If the height of the conveyor belt of the sealing machine is incorrect, you can adjust the height of the conveyor belt to a suitable position. If the height of the sealing frame is incorrect, you can adjust the height of the sealing frame to a suitable position. Re-adjustment, the shrink bag of the wrapping package is too large, you can reduce the size of the shrink bag a little

8) Crush the package: the package is compressed to the shrink film until it is deformed or crushed

solution:

If the temperature of the shrink packaging machine is too high, you can lower the temperature. If the speed of the conveyor belt of the shrink packaging machine is too slow, you can increase the speed of the conveyor belt. One point, the shrinkage tension of the shrink film used is too large, which is not suitable for the packaging, and the shrink film with lower shrinkage tension is used.