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High-Quality CPP Cast Film for Packaging - Transparent Heat Sealing Film from China Suppliers & Factory
Production Process of Cast CPP Packaging Film
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1Raw Material Preparation: Food-grade primary polypropylene (PP) raw materials are adopted to ensure the material is safe and non-toxic, complying with international food contact standards, and guaranteeing packaging safety from the source.
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2Melting and Extrusion: The raw materials are put into the extruder, melted and plasticized at high temperature, then uniformly extruded through high-end precision dies. The dies precisely control the film material flow channel, laying the foundation for film uniformity.
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3Cast Forming: The extruded film material is attached to the cooling roller for rapid cooling and shaping, forming the initial film shape and ensuring the film's flatness and physical properties.
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4On-line Thickness Measurement and Adjustment: The on-line thickness measurement system monitors the film thickness in real time, and the data is synchronously fed back to the control system to automatically fine-tune production parameters. This ensures the thickness deviation of the full-width film is controlled within a very small range, guaranteeing product consistency.
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5Winding and Cutting: The film qualified by thickness measurement is accurately wound, and then cut into different specifications according to requirements, finally producing high-quality cast CPP packaging film.
Applicable Packaging Scenarios
With stable physical properties and wide adaptability, the general-purpose cast CPP packaging film can meet various packaging needs, including but not limited to:
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1. Anti-fog PackagingSuitable for packaging products such as fruits and vegetables that are prone to fog due to temperature differences, helping to maintain the clarity of the film surface.
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2. Fresh Flower PackagingWith certain air permeability, it can be used for fresh flower preservation packaging to slow down the decay rate of flowers.
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3. Retort PackagingSome specifications of products can withstand a certain temperature, suitable for packaging scenarios of food that needs low-temperature retorting.
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4. High-speed Automatic PackagingWith high flatness and strong tensile resistance, it can adapt to high-speed packaging equipment and improve production efficiency.
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5. Tissue PackagingIt has good flexibility and sealing, and can be used for the outer packaging of sanitary products such as toilet paper and facial tissue.
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6. Matte FilmIt can be processed into a matte effect through subsequent processing, meeting the packaging needs of gifts, cosmetics and other products that require appearance texture.
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7. High-friction Automatic PackagingThe friction coefficient of the film surface can be adjusted to adapt to the traction and sealing process of the automatic packaging machine, avoiding packaging misalignment.
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8. Cold-resistant PackagingIt can still maintain good toughness in low-temperature environments, suitable for packaging scenarios of frozen food and low-temperature transportation.
Frequently Asked Questions
QWhat is cast CPP packaging film and how is it different from regular PP film?
Cast CPP (Cast Polypropylene) film is produced through a casting process where molten PP is extruded and rapidly cooled on a chill roll. This results in a film with superior clarity, excellent flatness, uniform thickness, and better heat-sealing performance compared to blown PP film, making it ideal for high-quality packaging applications.
QIs cast CPP packaging film food-safe and compliant with international standards?
Yes. Our cast CPP film is manufactured using food-grade primary polypropylene raw materials that are safe and non-toxic. The production process complies with international food contact standards, ensuring the film is safe for direct or indirect food packaging applications.
QCan cast CPP film be used for frozen food packaging?
Yes. Our cold-resistant cast CPP film maintains excellent toughness and flexibility even in low-temperature environments, making it well-suited for frozen food packaging and products requiring cold-chain or low-temperature transportation.
QHow is the film thickness controlled during production?
An advanced on-line thickness measurement system continuously monitors the film thickness in real time during production. The data is automatically fed back to the control system, which fine-tunes production parameters instantly to keep the full-width thickness deviation within a minimal range, ensuring consistent product quality.
QIs cast CPP film compatible with high-speed automatic packaging machines?
Absolutely. The film features high flatness, strong tensile resistance, and an adjustable surface friction coefficient. These properties allow it to adapt seamlessly to the traction and sealing processes of high-speed automatic packaging machines, reducing misalignment and improving overall production efficiency.
QCan cast CPP film be customized into matte finish or different specifications?
Yes. Cast CPP film can be processed into a matte finish through subsequent surface treatment, making it suitable for premium packaging of gifts, cosmetics, and other products that require a refined appearance. It can also be cut and wound into various widths and roll specifications to meet different customer requirements.