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  2. Blown films extrusion is one of many polymer manufacturing processes. This method is used to produce commodity and specialized polymer films that are typically used in packaging such as shrink, stretch, barrier films (used to protect deli meat), frozen food packaging, and shopping bags.
    amcorplastics.com/blown-film-extrusion-process-explained/
    amcorplastics.com/blown-film-extrusion-process-explained/
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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.
    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.
    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 polymers are used in blown film extrusion?There are many types of polymers that can be used in blown film extrusion with the most common being polypropylene and polyethylene (LDPE, HDPE and LLDPE). 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.
    Why do blown film extruders need to be cleaned?Oxygen in the feed throat hopper is a major issue for blown film extruders, as it causes carbonization on the screw and dyes. Unexpected downtime for cleanings can be two weeks or longer. Improved uptime by minimizing the number of cleanings, is a goal of every extruder.
     
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  5. Blown Film Extrusion Process Explained – Amcor, Inc.

  6. Understanding the Basics of Blown Film …

    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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