Blow Film

Blow film extrusion is a technology that is the most common method to make plastic films, especially for the packaging industry. Typically, blown film extrusion is carried out vertically upwards, however horizontal and downward extrusion processes are now becoming more common. The process involves extruding a tube of molten polymer through a die and inflating to several times its initial diameter to form a thin film bubble. This bubble is then collapsed and used as a lay-flat film or can be made into bags.

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