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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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    How does blown film extrusion work?For example, blown film extrusion inflates the polymer radially while at the same time drawing the polymer upward with rollers. These forces stretch the polymer in both the transverse and draw directions, providing strength in the film.
    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 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.
    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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