Stretc Film Types

Stretch Film Types

There are many types of stretch wrap film. Each type has qualities that are particularly suitable in addressing the specific needs of your stretch wrapping operation, such as load size and type, performance requirements as well as budget. Below are some types of stretch film, their attributes and applications.

Cast stretch film

 like blown stretch film, is created using an extensive manufacturing process known as cast extrusion. This process requires the continuous propelling of thermoplastic material through a flat die onto a chilled roll. The film thickness is then determined by how fast the casting roll pulls the plastic away from the die. This process causes cast films to have excellent clarity, which allows users the ability to see the wrapped products.

 cast film has excellent qualities, including a lower price tag from blown film, it does not stand up to blown film in holding power and tear resistance. Cast stretch film is initially easier to stretch, but because it is less dense, the film does not have as strong of a stretch memory.

Blown stretch film

 is manufactured by a process known as blown extrusion. This process consists of plastic melt being pumped through a circular slit die, in order to create a thin walled tube. Air is then introduced to the tube, allowing the volume of air contained to stretch the tube to the desired width. On top of the tube an air ring blows onto the film to cool it. This process of cooling the film allows the blown film to be tougher and more resilient to other types of film. blown film has the advantage of higher tear resistance and strength due to its manufacturing process, this also results in higher costs to consumers and poorer film clarity.