Stretch film for palletized goods

The stretch film used for palletised goods is made from linear low density polyethylene.
There are different types of this material which will give different properties to the film produced.

Stretch film can be produced by two different methods:
Cast (plate molten) film where melted polyethylene is molded onto a chilled steel cylinder and the film is formed.
Blown film where melted polyethylene is formed into a film in a circle shaped extruder  and air chilled.

The two methods give film with different properties. Cast film is highly transparent, soft and workable. Blown film is a harder and stronger material and offers properties suitable for goods that are stacked. The adhesion of the film can be achieved in different ways. Blown film normally has an additive of a contact adhesive while cast film gets its adhesion from a surface layer of soft material.

Polyethylene is normally transparent but can also be either translucent or opaque, when the goods need to be protected against light or there is a risk of theft. When stored in the open the film has to be protected against UV light to avoid it breaking down. If the goods also have to be protected, the best way to do this is to use either translucent or opaque materials, but also transparent film can be made to filter away the UV light through the addition of additives .

It is important to determine if it is the goods or the film that need to be protected from UV light since different additives are needed .

Cast Film Blown Film
Clear Hazy
High Gloss Dull
Lower Modules-Easy Stretch Tough
Quiet Unwind Noisy Unwind
Tear Resistant Tear Resistant
Non-Migratory Cling Migratory Cling
Excellent Gauge Control Less Exact Gauge Control
Good Puncture Outstanding Puncture
  No Gauge Bands
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