What is the difference between blown and cast stretch wrap

As you can see, both films have their benefits and hindrances. So, which stretch film fits your application? Factors to keep in mind include: What type of machine is being used, if not applied by hand?

What kind of load is being wrapped? Where does your skid go after leaving your dock? How many variants of load does your facility wrap?

Located in the Midwest? Contact Us. The molecule structure of blown film is criss-crossed which means when tensioned, it locks in very hard so therefore has a lower stretch yield compared to cast films. Blown Stretch film is known to be tough, slightly tacky and has a hazy surface.

The double sided tack gives off noise whilst being applied to the product. Our cast stretch films are created by molten resin operated through a large extruder which forces thin layers of film to be then cooled and laminated into layers. This multi-layered film is then rolled onto cores. Cast Stretch film has high clarity and quiet application due to its lower on a single-sided tack.

Pre-stretched film is used to drastically reduce the need to pull extra tension whilst applying the film to the product. The Omni Dynamic Wrap is a film that is pre-stretched prior to it being produced onto the cores. Suited specifically to those packaging lighter weight products that tend to move around on the pallet whilst being stretched. What is Blown Stretch Wrap? The critical tightness, or wrap force, is controlled by the tension between the load and the film feed.

Every company is under pressure to buy smart. These include shape, type and weight of your load; environmental considerations e. Generally the right formulation, the right gauge and the right pre-stretch are then optimized for the right containment force for your load. This is an important distinction, because often loads that look shiny and wrapped may not be wrapped according to a containment force spec! Image Credits- reifenhauser. Optimizing stretch wrapping operations requires an understanding how is stretch film made and what differences there are between blown and cast film.

Filed Under: Stretch Film. Adapt to new requirements. Click here to complete your request form. My Account Careers Lantech Blog. Films are either blown or cast. Film extrusion All stretch film starts with some polymeric feed stock. Blown stretch film Blown film is created as the thick layer of extruded film emerges from a circular die and a large bubble of air is blown inside.

This is a vertical process as shown in the schematic. Cast stretch film Cast film production involves a different process. This is a horizontal process as shown in the schematic.

Differences between stretch film that is cast vs. Evolution of films Film is getting thinner.