There has two kinds shrink wrapping machines. One is use for packing PVC film, other one is use for packing PE film. But just PE film will realize sleeve shrinking type.Actually, the bigger size of the products, the worse packaging performance.Let's YUPACK help you to resolve the not-well packing performance:

1.Lower temperature,each kind film has its suitable temperature.So, the suitable temperature will realize better packaging performance.
2.Conveyor speed,the temperature must be according to the temperature degree. If the temperature is suitable. Must adjust the conveyor speed of heat shrink tunnel. So, better conveyor speed will be better shrinking performance of shrink wrapper.
3.Fan direction.The fan direction decide the quantity of heat on the face of the products.

In conclusion,the above three solutions will realize better shrinking performance of the products.