Stretch Wrap 101: Cast vs Blown Stretch Wrap
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When making the comparison of cast vs blown stretch wrap, there are many elements to consider. Do you known what cast plastic stretch wrap is, how it performs, and what applications it works best for? What about blown stretch film wrap?
BASCO wants to help you make the right decision based on your needs.
What Does Cast Mean for Stretch Wrap?
A cast stretch wrap is stretch film wrap that is created by feeding a sheet of heated resin along with a rolling path with chilled rollers that then solidifies the film. It is then made into large rolls.
The Perks
Cast stretch wrap film is an industry leader as a general purpose wrap: Represents the other 70-80% of stretch film manufacturing according to general industry estimates
Resists tears and punctures
Has clarity to see wrapped products
Quietly unwinds
Flexible in application, less force to stretch: Plastic stretch wrap stretches up to 300%
Smooth unwinds and consistent for better, tighter wrapping
Clings better than blown stretch wrap film
Cast Stretch Wrap Applications
Ideal for various tasks
And What About the Cling?
The one clinging side on the inside of the roll faces the load
Allows separate individual pallets to be stored by one another without any damage to either pallet
Ideal for various applications
Means two sides of cling on the roll of film, but with a higher cling on one side
Offers the highest tack possible out of the cast stretch film varieties for maximum load holding power
Ideal for manual warehouse applications and replacing standard grade films
Two sided cling allows the wrap to stay securely wrapped.
For those who like a visual breakdown, let's unwrap cast stretch film:
What is Blown Stretch Wrap?
By blowing heated resin out vertically into a bubble that is then transformed into rolls while the blown stretch wrap is cooled by the surrounding air
The Perks
Blown stretch film rolls have extremely high load holding capacity
If you want to learn more, please visit our website China Stretch Wrap Dispenser.
Very hard to tear: Even for sharp edged products with its bi-directional tear resistance
Ideal for irregular cartons and shorter loads
Blown Stretch Wrap Applications
There is a narrow range of blown stretch wrap uses ( usually with the higher gauge blown shipping wraps ) because of its superior strength: Pulp, paper, timber, and other construction products
Here's a quick summary on blown stretch film:
The Differences
Blown vs cast stretch wrap...The good thing is that regardless of which wrap you go with, both offer money saving pre-stretch performance, effective load containment, and can handle a range of applications.
So, what's really the difference in this debate of cast or blown stretch wrap as your stretch film selection?
Maybe a comparison and two videos will help:
Blown Stretch Film:
Higher tear resistance for loads with sharp edges
Higher stretch capacity and higher memory once stretched for better secured loads
Higher load capacity
Noisy unwind
Hazy and dull due to crystallization in manufacturing process
Cast Stretch Film:
Less expensive due to less manufacturing process costs
Higher levels of "cling" (how the film 'sticks' to itself)
More consistency and flexibility
Quieter unwind
Clearer & shinier on a load to see wrapped products better
This concludes the breakdown about the two stretch film types to help you make the right choice. And that's a wrap! Get to wrapping your pallets of empty pails and drums like 55 gallon salvage drums,
It is the difference in extraction that gives the wrap different attributes.
Blown film
This is the traditional way of producing film and takes its name from the process used to create it. Heated resin is blown through a circular die, and a thick layer of extruded film emerges as a large bubble. The bubble can be many feet tall &#; and it is this height that allows the film to gradually cool before rollers collapse the bubble and flatten the material for shaping onto rolls.
The very nature of blown film makes it a pre-stretched product, and the thickness of blown film is adjustable dependent on the diameter of the tube from which it comes.
Cast film
Cast film is created by feeding a sheet of heated resin through a flat die. The molten material emerges from the die and out onto larger chilling rollers which cool and solidify the material. It is then ready for trimming and rolling.
Cast film is minimally pre-stretched compared with blown film giving it improved depth of drawing for thermoforming operations. The cooling process can be used to produce different characteristics in the final product. Cast film can be thinned by winding the film out of the roller faster than it is extruded.
Contact us to discuss your requirements of Pallet Packaging Equipment. Our experienced sales team can help you identify the options that best suit your needs.