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Candle Filters for BOPP Film Line - China Suppliers & Factory for Main Extruder and Coextruder Applications
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
Key Material Properties
BOPP film is a very important flexible packaging material. Key characteristics include:
- Colorless, odorless, tasteless, and non-toxic
- High tensile strength & impact strength
- Excellent rigidity, toughness, and transparency
The surface energy of BOPP film is low, and corona treatment is required before gluing or printing. After corona treatment, BOPP film has good printing adaptability and can be overprinted to obtain exquisite appearance, so it is often used as the surface layer material of composite film.
Extruder Filter Screen & Continuous Production
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)
Q1: How is BOPP film manufactured?
BOPP film is produced by taking high molecular polypropylene melt and forming it into a sheet or thick film through a machine head. It is then stretched in longitudinal and transverse directions at specific temperatures and speeds, followed by cooling, heat treatment, or special processes like corona and coating.
Q2: What are the main types of BOPP films available?
Commonly used BOPP films include ordinary biaxially oriented polypropylene film, heat-sealable BOPP film, cigarette packaging film, pearlescent film, metallized film, and matting film.
Q3: What makes BOPP film an ideal flexible packaging material?
BOPP film is colorless, odorless, tasteless, and non-toxic. It also features high tensile and impact strength, excellent rigidity, toughness, and superb transparency.
Q4: Why does BOPP film require corona treatment?
Because BOPP film has low surface energy, corona treatment is necessary before gluing or printing. This process improves its printing adaptability and overprinting quality, making it ideal for the surface layer of composite films.
Q5: What is the purpose of the extruder filter screen?
The extruder filter screen is used to filter and blend various viscous materials like plastics, chemical fibers, rubber, adhesives, and coatings to ensure only qualified products are produced.
Q6: How does an automatic screen changer benefit the extrusion process?
An automatic screen changer allows the extruder to replace the filter screen without interrupting production. This saves labor and time, keeps product performance stable, increases effective filtration time, and reduces overall production costs.