What is the role of corona technology in plastic film production? How can you improve print quality with this innovative solution used in film extruder machines? Details in our blog post!
Plastic film production is of critical importance in the packaging and printing sectors. However, ensuring quality in the printing or coating processes performed on these films depends on the correct preparation of the surface. At this point corona technology, improves print quality by allowing plastic film surfaces to better hold materials such as ink, adhesives or coatings.
The Role of Corona Technology in Film Production
Plastic films produced in film extruder machines are not suitable for printing without corona treatment. In this technology, high voltage between 15,000-17,000 volts is applied to the surface of the film. During this process, microscopic roughness is created on the surface of the film. This rough structure prevents the ink from flowing and the adhesive from slipping, providing a more durable hold.
The corona unit consists of three main components:
- Control Panel: The operation of the corona device and the adjustment of the current intensity are carried out via this panel.
- Current Unit: It creates millions of microscopic imperfections on the film surface with high voltage. This process ensures that the ink and adhesive adhere homogeneously.
- Power Unit It consists of bombardment bars and rubber rollers. Surface treatment takes place as the film passes through this unit.
Corona Application in BOPP Films
BOPP (Biaxially oriented polypropylene) films are preferred due to their low density, excellent optical properties and high mechanical strength. With these properties, they are used in many areas such as food packaging, flower wrapping, textile products and adhesive tapes. However, corona treatment is mandatory for BOPP films to ensure ink adhesion before printing. The surface is roughened with electron bombardment, creating a surface that allows ink and other materials to adhere.
Correct Corona Adjustment
For the corona process to be successful, it is critical that the device settings are made correctly:
Ozone Gas Control: The covers must be closed during the corona process, thus preventing ozone gas from spreading into the environment.
Current Intensity: The current value must be set correctly on the control panel.
Parallelism: The bombardment bars and rubber rollers must be parallel to each other to ensure even treatment on the surface. Otherwise, some areas may remain untreated.
Quality Increase in Production with Corona Technology
In plastic film production corona technology, not only improves print quality, but also offers energy efficiency and environmental benefits. It provides fast and effective surface preparation with high voltage processes while minimizing the use of chemicals.
As Ais Engineering, we produce high-efficiency corona devices. These devices are an indispensable solution for the production of high-quality, durable and environmentally friendly products. By applying this technology correctly in your film extruder machines, you can obtain products that meet industry standards. You can contact us to get information about our domestically produced corona devices.