Blown Film Extrusion

In blowing film a tubular cross-section is extruded through an annular die usually a spiral die which is drawn and inflated until the frost line is reached. To cool the material the extruded tubular profile passes through one or two air rings.

Blown Film Extrusion (Film Blowing) Plastic melt is extruded through an annular slit die, usually vertically, to form a thin walled tube. Air is introduced via a hole in the center of the die to blow up the tube like a balloon. Mounted on top of the die, a high-speed air ring blows onto the bubble to stabilize the bubble and cool it. This allows manufacturers to run at higher rates without loosing bubble stability. On higher output lines, the air inside the bubble is also exchanged. This is known as IBC (Internal Bubble Cooling).

There are various machines that use this process like

• Monolayer Blown Film Machinery
• Multilayer Blown Film machinery
• Wide Width blown film machine
• PPTQ blown film machine etc

Other related extrusion processes are

• Sheet Extrusion
• Profile Extrusion
• Pipe Extrusion
• Lamination
• Foam etc.