Pearlized film is a special type of plastic film with a pearly luster on its surface, widely used in food packaging, cosmetic packaging, gift packaging, and other fields. This article will provide a detailed introduction to the production principles of pearlescent film, including material selection, production processes, and main applications.
Production Processes of Pearlescent Film
The production of pearlescent film mainly includes the four steps
1. Mixing and Blending
In producing pearlescent film, polypropylene resin and pearlescent pigment are first mixed in a certain proportion. We usually use a high-speed mixer to ensure uniform mixing. Additionally, during this process, we can incorporate other additives such as antioxidants and UV absorbers to enhance the performance of the pearlescent film.
2. Extrusion Molding
The blended material is melted and extruded through an extruder, The material is pushed by the screw, heated to a molten state by the heaters, and then extruded through the die. The shape and size of the die determine the thickness and width of the pearlescent film.
3. Blown or Cast Film Forming
Pearlescent film forming methods mainly include blown film forming and cast film forming.
- Blown Film Forming: The molten material is extruded through a circular die and blown into a tubular film by airflow. By adjusting the pressure and speed of the airflow, the thickness and width of the film can be controlled. Blown film forming usually results in pearlescent films with good mechanical properties and luster effects.
- Cast Film Forming: The molten material is extruded through a flat die and rapidly cooled and formed by cooling rollers. Cast film forming produces pearlescent films with uniform thickness and smooth surfaces, suitable for high-quality packaging requirements.
4. Surface Treatment
We can apply surface treatments to further enhance the appearance and performance of the pearlescent film. Common surface treatment methods include coating, embossing, and laminating. For example, coating a protective layer on the pearlescent film surface can improve its abrasion resistance and chemical resistance; embossing can increase the three-dimensional effect and decorative appeal of the film.
Characteristics of BOPP Pearlescent Film
- Pearlescent Effect: The unique pearlescent effect of pearlescent film can display different colors and brightness under different angles and lighting conditions.
- Scratch and Abrasion Resistance: Pearlescent film has excellent scratch and abrasion resistance, effectively protecting the product surface from scratches and wear.
- High Transparency: The surface of pearlescent film is smooth and highly transparent, without affecting the original texture and color brightness of the product.
- Easy to Process: Pearlescent film has excellent comprehensive performance, including plasticity and processability, making it adaptable to different product processing requirements.
- Cost-Efficiency: The use of pearlescent film can help reduce costs.
Applications in the Packaging Industry
Pearlescent film is a highly practical material with wide applications in printing, packaging, clothing, and other fields. For printing, we use it for business cards, flyers, book covers, and more. In packaging, it serves to make gift bags, food packaging, pharmaceutical packaging, etc. In clothing, it functions as printing materials or decorative materials.
Conclusion
As a packaging material with unique appearance effects and excellent performance, the production principle of pearlescent film involves material selection, mixing and blending, extrusion molding, and surface treatment. Carefully controlling the production process allows us to produce high-quality pearlescent film that meets market demands.