When it comes to packaging and transporting your product, stretch film has you covered. For businesses that require a reliable and cost-effective pallet wrapping solution, familiarizing yourself with the different types of stretch film is important. We have a professional skills in developing & producing stretch film. One of the frequent queries we come across is cast vs blown stretch film. Both are great to stabilize, but have different attributes that apply in our core product range.
Cast Stretch Film: What it’s made of
Whilst cast stretch film is produced by melting the polyethylene resin and forming it out through a flat die creating a ribbon which is then extruded on cooling rollers. This technique will yield a film that is very clear and shiny. A few of its many great features are high cling that works great with a shrink wrap dispenser to keep wrap tight, excellent load retention perfect for both machine and manual types of loads. The cast process also allows for a quieter unwind, thus it is the preferred choice in office type atmospheres. In addition, cast film provides impressive downgauging for source reduction and a consistent, slick surface with high-speed pre-stretch on automatic equipment. This makes it perfect for heights which contain uniform pallet loads, and clear bar code reading/label scanning is required. At Shanghai Pudi, our machine cast stretch film is built for versatility and performance in high speed applications.
Properties of Blown Stretch Film
Blown stretch film is made by extruding a thickness of molten polyethylene upwards and blowing it like a balloon, then coiling it to make into a tube. The tube is then collapsed and slit to the desired width. It is this method of production that provides blown film with its specific properties. It’s got a tiny bit of haze/milky appearance and cling that’s a bit sticker and grippier. The greatest strength of blown film comes from its ability to resist puncture and tearing. Molecular structure of the film is formed as a result of the blowing process and the film's unique strength prevents from punctures, rips and tears making it an excellent choice for load securing. With high tensile strength, its load-bearing characteristic is good enough that it replaces thicker materials in many applications.
How to Select Film for Your Application
Which type of stretch film, cast or blown is best for my application? Our cast stretch wrap product line when your business must have film that unwinds clear, quiet unwind and perform at high-speed levels on standard stretch film equipment our Cast Stretch Film is the answer. It offers the level of performance and load stability that you can count on. On the flip side of the scale, if your application is only handling heavy, oversized or goods with sharp corners our blown stretch can give you all the toughness and puncture resistance needed to prevent pointy edge breaks that will result in down-time. Its aggressive stick ensures that the film remains in place, even under tough conditions. At Shanghai Pudi Packaging Materials Co., Ltd., we provide a full line of cast stretch film and blown stretch films as well. It’s our job to help you decide which film from the core series of products will work best for your packaging needs, while keeping your products safe and improving overall efficiency.