Cast stretch film is manufactured using the cast extrusion process. Typical characteristics of cast stretch films are: excellent optics, clear, glossy, superior tear resistance, quiet unwind, consistent cling and consistent film thickness. Cast Film is more effective in cold storage applications.
Manufactured using the blown film extrusion process and also referred to as blown film. Typical blown stretch film characteristics are: poorer optics and noisier unwind, but,
excellent puncture resistance and capable of achieving a high force on load (load containment).
The market is 66% cast film and 34% blown film. Most of the blown film is in the hand film market.
A Loads are typically cubed with no protrusions and unitized. These are the easiest to wrap.
B Loads are pallets that may have an object protruding or do not have clean vertical sides but rather have irregular sides. The puncture hazard may require a better performance film.
C Loads are very irregular loads with many corners, sharp edges, or protrusions and are difficult to wrap. A higher performance stretch film will be required to handle this type of difficult load.
You should use hand wrap when:
• Pallets are too unstable to transport to a stretch-wrapper
• Operational set-up does not support wrapping in limited/specified locations
• Variability in package integrity is acceptable to the customer
• Lowest cost
• Good cling performance
• If pallets touch, sticking and tearing of the wrapping may occur
• Best abrasion resistance
• Lowest cling performance
• May cause "tails"
There can be a lot of damage in the process of shipping pallets. This is caused by pallets bumping or rubbing together during transit, triggering the films on each skid to stick. If this is an issue for your shipping process you might want to consider one-sided cling film.
Pre-Stretch film is mostly used in hand applications. The most beneficial advantage to pre-stretch film vs traditional stretch film is an equal or increase in load
stability with less total film used. This can improve your total cost on packaging materials.
The other benefits to using pre-stretch film:
• Lighter Rolls which will lead to less energy used when wrapping (Less of an injury risk lifting a lighter material)
• More consistent wrapping tension
It's easy to determinine if you are getting all of the stretch film you are paying for! Take a full roll of the film that you are currently using to a shipping scale
and weigh it. You may want to measure the width of the film yourself to ensure that you are getting the full width published or enter the manufacturer’s provided information
for width, length and gauge into the calculator below. The result should match the result that you got when you weighed the full roll.
When wrapping a pallet please consider the conditions your material will shipped/stored. A top sheet might be a good solution to keep moisture or dust off your product.