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Cast vs Blown Stretch Wrap: The Differences and Benefits of Each

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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 vs Blown Stretch Wrap

How Is Cast Stretch Wrap Made?

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.

Advantages of the Cast Extrusion Manufacturing Process

  1. The price is cheap. Cheaper than blown stretch film, cast stretch film is more popular due to lower manufacturing costs
  2. High transparency. The packaged product can be clearly seen
  3. Compared with blown elastic bandages, cast elastic bandages can be quietly unfolded.
  4. Flexible application and less stretching force: plastic stretch wrap can stretch up to 300%
  5. Unfolds smoothly and stays consistent for a better, tighter wrap

How Is Blown Stretch Wrap Made?

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.

Deruna Cast vs Blown Stretch Wrap

Advantages of Blown Film Extrusion Manufacturing

  1. Has higher puncture resistance; preferably used for wrapping sharp products and heavy objects such as masonry and building materials
  2. Low transparency of the film due to crystallization during the manufacturing process
  3. Has high adhesion

Blow Stretch Packaging Applications

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.

What else should you consider when choosing Cast vs Blown Stretch Wrap?

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.

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