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Candle Filters for BOPP Film Line - China Suppliers and Factory for Bruckner Extruder Systems
In the production of BOPP film, the melt of high molecular polypropylene is first made into a sheet or thick film through a long and narrow machine head, and then in a special stretching machine, at a certain temperature and a set speed, simultaneously or step by step. The film is stretched in two vertical directions (longitudinal and transverse), and after proper cooling or heat treatment or special processing (such as corona, coating, etc.).
Commonly Used BOPP Films
- Ordinary biaxially oriented polypropylene film
- Heat-sealable biaxially oriented polypropylene film
- Cigarette packaging film
- Biaxially oriented polypropylene pearlescent film
- Biaxially oriented polypropylene metallized film
- Matting film, etc.
Important Properties
BOPP film is a very important flexible packaging material. BOPP film is colorless, odorless, odorless, non-toxic, and has high tensile strength, impact strength, rigidity, toughness and good transparency.
Extruder Filter Screen Functionality
The filter screen is a very important part of the extruder, and only qualified products can be produced through the filter screen. The extruder filter screen is used for the filtration and blending of various viscous materials and products such as plastics, chemical fibers, rubber, hot melt adhesives, adhesives, coating materials, and mixtures. The extruder filter screen has a mesh type. With the mesh belt type, the extruder can replace the filter screen without interrupting the production through the automatic screen changer, saving labor and time, product performance is stable, realizing automatic screen change and free operation, increasing effective filtration time, and reducing production costs.
Frequently Asked Questions (FAQ)
How is BOPP film produced?
BOPP film is produced by extruding high molecular polypropylene melt into a sheet or thick film through a machine head. It is then stretched vertically (longitudinally and transversely) in a stretching machine at set temperatures and speeds, followed by cooling, heat treatment, or special processes like corona and coating.
What are the common types of BOPP films available?
Common types include ordinary BOPP film, heat-sealable BOPP film, cigarette packaging film, pearlescent film, metallized film, and matting film.
What are the main characteristics of BOPP film?
BOPP film is colorless, odorless, non-toxic, and offers high tensile strength, impact strength, rigidity, toughness, and excellent transparency.
Why does BOPP film require corona treatment?
Due to its low surface energy, BOPP film requires corona treatment to improve its printing adaptability and gluing properties, allowing it to be overprinted and used as a surface layer for composite films.
What is the role of the filter screen in the extruder?
The filter screen is essential for filtering and blending viscous materials (like plastics, rubber, and adhesives). Using an automatic screen changer with a mesh belt type allows for continuous production without interruption, reducing labor, saving time, and lowering production costs.