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  2. Blown Film A process known as blow film extrusion uses an industrial blower to expand a hot plastic tube into a light, strong plastic bag. The air inflates the plastic tube like a balloon until a bag with the desired shape, size, and wall thickness is formed.
    www.plastics.org.nz/images/documents/PDFs/The_Basics_-_Blown_Film.pdf
    www.plastics.org.nz/images/documents/PDFs/The_Basics_-_Blown_Film.pdf
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    What is blown film extrusion?This method can manufacture monolayer films as well as more complex multi-layer films that involve co-extrusion to combine more than one plastic into a single film. Blown film extrusion can be complex so we will now explain each step of the process in detail! The first step is to melt the polymer in an extruder.
    How is blown film made?The first step in blown film manufacturing is extrusion. Plastic resins, such as polyethene (PE) or polypropylene (PP), are melted and formed into a molten state using an extruder. The extruder consists of a screw that conveys the resin through a heated barrel.
    Why are blown films made using coextrusion?Blown films are sometimes produced using coextrusion, where both extruders use the same resin and the same melt flow. This is normally done to improve process stability and line efficiency.
    What problems occur in blown film extrusion?Many problems occur in blown film extrusion in the hot melt between the die and the frost line and where the tube is collapsed at the main nip. Other sections in this booklet deal more specifically with problems such as uneven rolls, gauge bands, wrinkles, maintainng output, physical and optical problems and solutions.
     
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    WEBExtrusion. The first step in blown film manufacturing is extrusion. Plastic resins, such as polyethene (PE) or polypropylene (PP), are melted and formed into a molten state using an extruder. The extruder consists of a …

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