Production Process of Film Blowing Machine

time21 Feb 2024
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Film Blowing Machine is a versatile and extensively employed process in the plastics industry, which is utilized to create thin plastic films suitable for various applications like food packaging, construction, agriculture, and medical products.

This article explains the process of film blowing machine, including the materials used, the production process of a film blowing machine


The Basics of Film Blowing Machine

Film Blowing Machine involves melting plastic pellets and passing them through a circular die. As the plastic is extruded, air is blown into the center of the die, causing the molten plastic to expand into a bubble or tube.


The tube is then cooled and collapsed, generating a thin film that can be wound onto rolls for further processing or use. The thickness of the film can be adjusted by regulating the speed of the extruder, the airflow, and the size of the die.


Blown film machines typically melt plastic particles using a screw and blow the melted flowing plastic into a film using a specific mold.


Materials Used in Blown Film Extrusion

Blown film extrusion can accommodate a vast range of plastic materials, such as low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), and polystyrene (PS). The choice of material depends on the application and desired properties of the film.


For instance, LDPE is frequently used for food packaging and agricultural films, while HDPE is employed in heavier-duty applications such as trash bags and construction films.


The production process of a film blowing machine typically involves several key steps:

1. Raw Material Preparation: The process begins with the preparation of raw materials, which usually include plastic resins such as polyethylene, polypropylene, or other similar materials.

2. Extrusion: The prepared raw materials are then fed into an extruder, where they are melted and formed into a continuous molten mass.

3. Blowing Process: The molten plastic is then passed through a circular die, where it is inflated by air to form a thin, continuous film tube.

4. Cooling and Shaping: The inflated film tube is cooled using air or water to solidify the material and maintain the desired dimensions and properties.

5. Winding: The cooled film is then wound onto rolls or spindles for storage or further processing.

6. Quality Control: Throughout the process, quality control measures are implemented to ensure that the produced film meets the required specifications and standards.

7. Additional Processing (Optional): Depending on the specific requirements, the produced film may undergo additional processes such as printing, laminating, or slitting to create finished products.

By following these steps, film blowing machines can efficiently produce various types of plastic films used in packaging, agriculture, construction, and other industries.



By comprehending the materials utilized, the necessary equipment, and the procedure itself, one can appreciate why  Film Extruder is a favored option for manufacturers. Its advantages, including versatility, consistency, and cost-effectiveness, render it a dependable choice for generating superior plastic films.

If you have any blown film extrusion machine needs or questions,  please feel free to contact us!


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