Stretch Wrap - a common product used to secure goods on a pallet for transportation. But are you aware of the different types and their purpose? Discover all things Stretch Wrap in this guide.
Blown Stretch Films
Blown stretch films are typically used for heavier irregular loads and applications requiring excellent puncture and tear resistance.
Additives are used to provide excellent cling and superior load stabilisation characteristics, as a result, Blown Stretch Films can be noisy as reels are unwound.
Cast Stretch Films
Cast stretch films provide a smooth surface with excellent optics, gloss, strength and cling without additives. Cast stretch film is a strong film that sticks only to itself to prevent products on pallets from moving while in transit. This pallet wrap is very popular in the food industry. Cast stretch wrap is very versatile.
Pre Stretch Films
Pre-stretching involves stretching the film during manufacture. The process can increase film strength, improve load stability, reduce the volume of stretch wrap film needed and subsequently save on stretch film packaging costs.
We offer a range of pre-stretched films, designed to achieve optimal pre-stretching results that can be used with stretch wrap machines and manual application operations.
Key benefits experienced from using pre-stretched films include:
- Reduced wastage
- No neck down
- Faster wrapping
- Improved health and safety for users
Selecting the best stretch wrap for your requirements
When selecting stretch films, consider the following:
Selecting a stretch film that provides the right yield strength and performance for the loads being wrapped is crucial. The yield strength denotes the amount of stress a stretch film can withstand without permanently having plastic deformation. Prior to reaching the yield point a stretch film will elastically deform but return to it's original shape once the stress is removed.
This is a technique for covering the top of your pallet using polythene top sheets. This protects your products and provides a downward force on the pallet load. When overlapping hand applied films, it is recommended users allow up to a 50% overlap. If using machine applied films, users should allow a 50mm overlap, regardless of the film width.
This refers to applying multiple wraps of stretch film to a particular area of a pallet to reinforce the load or band multiple units together.
This happens when a film loses its dispensing roll width and narrows down while being stretched. Neckdown reduces the coverage each wrap provides thereby making it likely that more wrap rotations and more film will be needed to wrap a load or pallet.
Consider the products being wrapped, also look at the weight load (typically per pallet), the load profile as described below, and the transit process the load will experience.
Time, Use and Cost Use
Hand wrapping is best suited for smaller or sporadic stretch film wrapping requirements. Introducing machine wrapping may ultimately save time, resources and packaging materials.
Hand-held stretch films
Hand-held stretch films are used for manual stretch wrap packaging application. As a result, hand film rolls are lighter and smaller than machine film rolls to make application easier.
Tips for using hand-held films
- Always place the outside of the film to the surface of the pallet.
- Secure the stretch film to the pallet before wrapping by tying it to the pallet base.
- Always ensure the film covers the base of the pallet and the bottom layer of the load.
- Wrap the bottom of the pallet at least twice to secure the load.
- Overlap the film by 30 to 50%.
- Depending on the weight of your load, consider wrapping the pallet twice.
- To increase strength, use the film horizontally to create a "strap".