Stretch Wrap vs. Shrink Wrap
Stretch Wrap is a product that is widely used, and more often than not, people could be saving money and time just by using the correct film for their application. Thicker does not always mean better, and a lot of customers could get better results for using a more appropriate gauge of film.
First, let’s start off determining the difference between Stretch Wrap and Shrink Wrap.
- I. Stretch Wrap is a plastic film that stretches as it is wrapped around of load of products. This allows the product to be held tightly together.
Typically used to hold boxes/product together on a pallet for transfer.
- II. Shrink Wrap is first covered loosely around a product or load and requires heat to shrink and become tight around the load.
Used primarily to hold together one package or product. Examples of common uses of Shrink Film are: Water Bottles, Sodas, CD’s, and Toys etc.
While both of these are effective ways of packaging products, there are specific applications that work better for each method.
Still not sure? Here are some advantages to both products:
Now that you know the difference between Shrink and Stretch Wrap, let’s look at the difference between Cast and Blown Stretch Wrap.
- 1. Cast– Extremely clear stretch film due to the extrusion process during manufacturing. This allows the products to be clearly seen through the stretch film. The manufacturing process is a continuous one where the thermoplastic material is melted and then extruded through a flat die onto a chilled roll. It then is quenched and re-solidified.
- 2. Blown– Although offering less visibility than cast, blown typically yields a greater holding potential. In most cases, it is more expensive than Cast. It is manufactured through a blown extrusion process. In this process the plastic melt is extruded through an annular slit die, typically vertically, which creates a thin walled tube. Air is brought into this tube and blows the tube up like a balloon. At the top of the tube, there is a cooling air ring that cools the plastic by blowing air at it. This process makes the film more resilient and tougher than Cast Film.