Changes

Blown film extruder is recognized by the wider public by it's several meter tall tower. The tower is the part of the equipment where the film blowing takes place. The resin is melted at the bottom of the equipment and than transformed to film. Then the film is led up to the tower. The main function of the tower is while the film is run through the tower from the bottom to the top, there is a controlled cooling airflow, air-blow applied to the film. The controlled cooling of the film is essential to produce film of consistent homogeneous quality.

Blown film extruder is recognized by the wider public by it's several meter tall tower. The tower is the part of the equipment where the film blowing takes place. The resin is melted at the bottom of the equipment and than transformed to film. Then the film is led up to the tower. The main function of the tower is while the film is run through the tower from the bottom to the top, there is a controlled cooling airflow, air-blow applied to the film. The controlled cooling of the film is essential to produce film of consistent homogeneous quality.

Blown film equipment can be categorized depending on the number of layers the film, which the machine produces, consists of. Plastic film are commonly used for packaging and insulating goods that are sensitive to light, heat and other external factors. The properties of the plastic film can be greatly engineered by layering plastic films together, (this what the co-extrusion is referring to) creating the so called barrier films. In some certain barrier film technologies plastic film is co-extruded with non-plastic material.

Blown film equipment can be categorized depending on the number of layers the film, the given machine produces, consists of. Plastic film are commonly used for packaging and insulating goods that are sensitive to light, heat and other external factors. The properties of the plastic film can be greatly engineered by layering plastic films together, (this what the co-extrusion is referring to) creating the so called barrier films. In some certain barrier film technologies plastic film is co-extruded with non-plastic material.

==Examples==

==Examples==