What does the film blowing machine do?
Jun 6,2024
A blown film machine is a piece of equipment used to manufacture plastic films, which are widely used in the packaging industry. The machine operates by melting plastic pellets and extruding them, then using the blown film process to form the molten plastic into films of the desired thickness and width. Here is an overview of the main working process and applications of a blown film machine:
Working Process
1. Melting the Plastic Material: Plastic pellets (such as polyethylene or polypropylene) are fed into the extruder hopper of the blown film machine. The pellets are then heated and melted by the heaters.
2. Extrusion Molding: The molten plastic is extruded through a die, forming a tubular film.
3. Blowing and Shaping: Air is injected into the tubular film, causing it to expand into a bubble and forming the film to the required thickness.
4. Cooling and Shaping: The expanded film is cooled by a cooling device (usually an air ring) to stabilize its shape and thickness.
5. Drawing and Winding: The cooled film is pulled by a drawing device and finally wound into rolls for subsequent processing and use.
Applications
The plastic films produced by blown film machines are widely used in the following fields:
- Food Packaging: Such as cling film and food bags.
- Industrial Packaging: Such as packaging films and stretch films.
- Agricultural Uses: Such as agricultural films and greenhouse films.
- Everyday Products: Such as shopping bags and garbage bags.
There are various types and specifications of blown film machines, which can be selected according to different production needs and materials to meet different application requirements.
