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Common heat shrink film wrap problems and solutions（一）
2024-07-11 11:09:37
A variety of issues can arise when wrapping products with shrink film. Such as shrink film bloating, fogging, fisheye problems. These problems can be corrected by adjusting the machine settings. Among them are often adjustments of shrink tunnel temperature, circulating air speed, conveyor belt speed, number of vent holes, and changing shrink film.
We will cover common problems and solutions when wrapping with shrink film. Most of these issues are familiar.
Ⅰ. Shrink film bloating
Shrink film bloating occurs excess air trapped inside the sealed shrink film.
Solution
1. Increase the number of vent holeso allow air to escape more quickly.
2. Slow down conveyor speed of shrink wrap machine and shrink tunnels. Helps hot air have more time to escape from shrink wrap.
3. Raise the temperature of the shrink tunnel to help air escape from the shrink wrap.
Ⅱ. Burnt Holes on shrink films
A cloudy appearance or burn Holes through the heat shrink film after passing through the heat shrink tunnel. The reason is that too much heat is applied to the shrink film.
Solution
1. Reduce the temperature of the shrink tunnel machine.
2. Increase the conveyor speed of shrink wrap machines and shrink tunnels.
3. Increase the number of vent holes in shrink film.
Ⅲ. Dog Ears On Shrink Wrap
The corners of the shrink film after shrinkage form a protruding triangle shape. They resemble a dog ear. It is a widespread problem when shrink wrapping.
Solution
1. The shrink bag of the package is too big, you can make it smaller. Utilizing a larger film width than necessary can result in dog ears appearing on the corners of your finished goods.
2. If the temperature of the heat tunnel is too low, Increase the temperature.
3. The heat tunnel blower speed is too low, speed up the blower.
4. If you are using poor quality shrink film, consider switching to a higher quality shrink film.
Ⅴ. Crow’s Feet on heat shrinkable film
Crow’s feet are wrinkles extending from the corners of your packages.
Solution
1. Using a smaller heat shrink film. Excessive film on the corners of the product occurs if there is too much film wrapping the product.
2. Temperature of shrink tunnel machine is too low Increase temperature.
3. Decrease the speed of the conveyor belt to allow enough time for the shrink film to heat.
4. Increase the air speed of the heat shrink tunnel blower.
5. There are too many vent holes on the shrink film, reduce the number or replace the film.
Ⅳ. Fish Eyes on shrinkable film
There are circular or oval patterns on the surface of shrink wrap film, and the shrinking effect is poor. The reason is lack of heat.
Solution
1. Increase the temperature of the heat shrink tunnel.
2. Reduce the speed of shrink wrapping machine and heat tunnel conveyor belt. Increase heating time.
3. If the air speed of the heat shrink tunnel blower is too low, increase the airspeed.