When choosing a stretch film, we will tell you that there are two kinds of stretch films to choose from: one is blown stretch film, the other is cast stretch film.
From the manufacturing process and application scenarios, cast vs blown stretch wrap will have different differences, let’s discuss together
Cast Stretch Wrap – Also known as Cast Stretch film, is manufactured using a cast extrusion process. Cast extrusion is a continuous process in which thermoplastic material is melted and extruded through a flat die onto chill rolls, where it is quenched and resolidified. This process gives Cast stretch film excellent clarity, requires less force to stretch, is more tear resistant, unwinds quietly from the machine, and provides excellent adhesion. Machine and hand cast stretch films are available.
Blown stretch film is manufactured by forcing molten resin through a circular die to form bubble tubes blown over 10 meters high. The bubbles are then flattened and made into rolls of film.
The molecular structure of blown film is bidirectional (or criss-cross), so when tensioned, it locks securely. Compared to cast film, it has a much lower draw yield.
Due to its superior strength, blown stretch packaging has a narrow range of uses (often used with higher specification blown transport packaging): pulp, paper, wood and other construction products.
With all that said, how do you decide which stretch film is best for your requirements，Cast vs Blown Stretch Wrap?
While both Cast vs Blown Stretch Wraps offer excellent pre-stretch properties and effective load control, the market is turning to cast films for good reason. Cast film not only offers excellent environmental performance through its high throughput, but also offers improved clarity and quiet unwinding, making it an increasingly popular choice.
It is no coincidence that deruna offers the highest standards of modern cast film for packaging trays. It’s ultra-thin, light and incredibly strong – stronger than the competition.
Still not sure?
Talk to us. We are ready to help you decide which stretch film is best for your requirements.