Stretch wrap – A highly stretchable plastic film, usually made of linear low density polyethylene (LLDPE), wrapped around an item. The elastic response allows the product to be tightly bound.
Stretch film is used to wrap products on pallets and secure them to each other. Helps reduce product loss, stops cargo tampering and reduces worker injuries.
In our blog post, we will explain the uses of stretch film in further detail. Stretch film comes in a variety of widths, thicknesses and types.
Here is a breakdown of the two most common stretch film extrusion processes Extrusion is the process used to produce stretch film and a information variety of other flexible plastic products.
Visit our blog for more details on the extrusion process.
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Cast stretch wrap – also known as cast stretch wrap – is manufactured using the cast extrusion process.
The cast extrusion process is a information continuous process in which thermoplastic material is melted and extruded through a flat die onto a cold roll, where it is quenched and re-solidified.
This process gives cast stretch film excellent clarity, requires less force to stretch, is more resistant to tearing, unfolds quietly from the machine, and provides excellent adhesion.
Both machine-grade and hand-grade cast stretch films are available.
Advantages of Cast Stretch Film – Cast stretch film is less information expensive than blown stretch film due to lower manufacturing costs. Cast stretch film is more popular.
Greater clarity allows users to see the packaged product. Cast stretch film can be unfolded quietly compared to blown stretch wrap.
Cast stretch film provides double-sided attachment so that the wrap remains securely wrapped.
Disadvantages of cast stretch film – does not provide the load/holding power that blown stretch film provides Cast stretch information film has lower memory and tear resistance than blown stretch film.
Blown Stretch Packaging – Also known as blow stretch packaging, it is manufactured using a blow molding extrusion process.
This plastic melt is extruded through an annular slit die (usually vertical) to information form a thin-walled tube. Air is introduced through an opening in the center of the die, causing the film tube to expand like a balloon.
At the top of the film tube, an air ring is blown onto the film to cool it. This process makes blown film stronger and more flexible than cast film.
The higher mechanical properties of blown film typically allow for more significant load retention.
Benefits of blown stretch information packaging – provides higher load and stretch capacity Blown stretch film is a premium film.
Blown stretch film has a higher memory when stretched, allowing for better product load retention security.
Higher tear resistance is an advantage when securing loads with sharp edges.
Disadvantages of blown stretch packaging – higher cost due to the manufacturing process Blow stretch wraps are less transparent due to crystallization in the manufacturing process. Blown film can also make noise when removed from the roll.
Typically, stretch film is used to transport boxes and products together on pallets. It is also used to hold other objects together and to protect objects during shipping and storage.
Stretch film can come in a variety of special films. Examples include UV stretch film, ventilated pallet wrap, anti-static stretch film, colored stretch film, etc.
How do I know what size stretch film to use?
For different applications, different sizes of film thickness and width need to be considered. Use the chart below to find out which thickness and width is best for your application.
The recommended load limits for stretch film are intended to give a general idea of load capacity only. They should not be interpreted as specification limits.
Click here to view our gauge conversion charts. For technical stretch wrap data, click here.
High Performance Machine Stretch Film is our way of dealing with the rising cost of machine stretch film.
High Performance Stretch Film is a multi-layer machine stretch film that offers more stretch than traditional machine stretch film. It offers plenty of opportunities for adherence and downsizing.