- Stretch Wrap Information
- Cast vs Blown Stretch Wrap: The Differences and Benefits of Each
- What is the difference between cast stretch film and blown stretch film?
Stretch Wrap Information
Advantages of Cast Stretch Film- Generally less expensive than blown stretch film, due to reduced manufacturing costs. Increased clarity allows users to see.get
By Michael Kralstein Stretch Wrap. When it comes to making a decision on the type of stretch wrap to use, the experts at AAA Polymer are here to help guide you to the best decision. In general, there are two different types of stretch wrap: blown stretch wrap and cast stretch wrap. There are significant differences in the two types of films ranging from the manufacturing process to the application use. Continue reading to learn more about the differences and benefits of each. Cast stretch wrap is created through a cast extrusion process, which starts with a granular resin being fed into a heated screw barrel.
Find out what the difference is between Blown and Cast Films/Wraps with this guide and 7 point film comparison chart from Rocket Industrial.
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Both blown and cast stretch wrap is used to contain and protect products on a pallet during transit and storage. Even though there is the one common purpose, there are multiple strengths, colours and lengths to suit different applications. Stretch Wrap is manufactured in two different methods which give the film different properties, they are commonly referred to as cast and blown. Within these two film categories, there are several types of stretch wraps with different resin technology and performance levels. Our blown stretch films are created by forcing molten resin through a circular die, creating a bubble tube which is blown over 30 feet high. The bubble is then flattened and produced into rolls of film.
Stretch Film is a plastic film commonly made from linear low density polyethylene LLDPE used in pallet wrapping, bundling and securing. The process of stretch wrapping a product or a pallet of products helps to reduce product damage and loss, increase product security and reduce worker injury. The two most commonly used types of stretch films are cast stretch film and blown stretch film. Cast Stretch Film - also known as cast stretch wrap, plastic wrap or pallet wrap, is made using a cast extrusion process, in which the polymer iscontinuously pumping through a straight slot orifice die , then chilling this hot sheet of plastic immediately after the die by contact with a cooled chill roll. Film thickness is determined by how fast the casting roll pulls the plastic away from the die. Blown stretch film , on the other hand, is fabricatedby a process of continuously pumping the polymer through a circular orifice die , then filling the tube this created with air. The volume of air contained within the tube stretches the tube or the bubble out to the desired width and, in conjunction with the rate at which it is being pulled away from the die the desired thickness is created.
The elastic recovery keeps the items tightly bound. Stretch film is commonly used to wrap products on pallets and secure them to each other and the pallet. This often helps to reduce products loss, discourage load tampering, and reduce worker injury. We explain in further detail in our blog post What is stretch film used for. There are a variety of widths, thicknesses, and types of stretch film. Below is a breakdown of the two most commonly used extrusion processes of stretch film. Extrusion is the manufacturing of stretch film and a variety of other flexible plastic products.
Cast vs Blown Stretch Wrap: The Differences and Benefits of Each
What is the difference between cast stretch film and blown stretch film?
Stretch film comes in varying gauges, colors and can be used in numerous applications. The main variable and starting point for stretch films is blown versus cast. Blown stretch film, also known as blown stretch wrap , is created by blowing heated resin out vertically into a bubble. The bubble is then transformed into rolls while it is cooled by the surrounding air. Cast stretch film , also known as cast stretch wrap is created by feeding a sheet of heated resin along with a rolling path with chilled rollers. The cooling solidifies the film, and it is made into large rolls.