PE shrink film normally is used for bundling especially heavy products. We usually see this when it uses to bundle soft drink. Why PE is used instead of PVC or POF? Compared with PVC, PE is stronger in terms of puncture resistance. Compared with POF, PE is relatively cheap and printing on the film is possible.
Normally we shrinkwrap Hamper by PVC shrinkable film. Of course, we can use Polyolefin if we want to help the environment. However, PVC is very easy to use. It normally is thickness (more than 25 micron) and when using the hot air blower, it is not easy to be torn. On the other hand, POF normally is 15 to 19 micron, if the operator is not familiar on the process, the changes to get the film torn is high.
PVC normally has better optic compared with POF, it is more glossy and make the hampers more presentable.
Some packer does not want to invest on shrinkwrapping machine, they would ask the supplier to convert the POF shrink film from rolls form to bag forms. Shrink bags are used because:
1. Easy to use. the operators just insert the product into shrink bag, get the bottom sealed and put into shrink tunnel.
2. No high investment on the shrinkwrapping machine.
3. always get better finishing after the shrink tunnel. the bags can be cut into optimum sizes for shrinkwrapped.
However, they are some drawback on the shrink bags because:
1. The packers need to keep different sizes for different products. if each bags have MOQ, end up the packers need to stock a lot of different bags.
2. High man powers are needed to insert the products. very labour intensive.
Normally Center Fold Polyolefin Shrink Film has a few standard thicknesses and lengths as below:
15 micron thickness X 1332m Length
19 micron thickness X 1067m Length
25 micron thickness X 800m Length
The combination of thickness and length makes the film roll has an outer diameter of 10″, which can fit into most of the Shrinkwrapping machines.
The following is the advantages and disadvantages of thiner and thicker films.
1. Thin Film ( 15 micron and below)
a) reduce carbon footprint. Better for the environment.
b) More economical. Cheaper cost / pack.
c) Longer in length, reduce machines changeover.
d) Longer in length, reduce inventory, less carton box and core.
2. Thicker film (19 micron and above)
a) stronger sealing strength
b) better tensile strength
c) Generally less static. Better machinerity.
d) Easier machine setting.
Polyolefin Shrink Film is a mixture of PP and PE material in the film. When PE is more in the film, it is normally called PE based shrink film. If the PP is more, it is called PP based. For those PE based polyolefin shrink film, cross-linked sometime is added so that the film has a better property in terms of tensile strength and sealing strength.
PP based polyolefin shrink film normally has better clarity and machinerity. The sealing time normally shorter and when there is a high speed requirement, PP based polyolefin shrink film is normally selected.