CPP and BOPP films are packaging films. There are differences in performance and application. They have different roles and properties. This guide will analyze their differences. Tell you how to choose.LetUnincorporatedUnToLet Enhance revenue and efficiency of your business
What is biaxially oriented polypropylene (BOPP) film?
BOPP film is a biaxially oriented polypropylene film. First, polypropylene is extruded through a narrow mold in a molten state to form a thick sheet. Then, it is processed in a specific machine at a specified temperature and speed. Longitudinal stretching and transverse stretching are performed in sequence. It is then cooled or heated.Finally, it undergoes corona treatment and coating to complete the manufacturing process. BOPP film has many advantages due to its biaxial stretching. For example, it has high transparency and strength. It is also highly durable and has excellent stretchability. In addition, it is waterproof. As a result, it is one of the most widely used packaging materials today. It has many uses and is often used in food packaging bags, gift packaging, printing materials, and other fields. It is convenient, practical, and effectively protects products.
Main Characteristics of BOPP Film:
BOPP film is a commonly used flexible packaging material. It is colorless, odorless, and non-toxic.It has high stretchability and impact strength. It is tough and highly transparent. After longitudinal and transverse stretching, it becomes more durable and does not break easily. It also has good moisture and gas barrier properties. It protects products from spoilage and has good printability. After corona treatment, it can be printed with beautiful patterns. It is commonly used as a surface material for composite films. High definition and glossiness make products more attractive.
However, BOPP film is prone to static electricity. An electrostatic eliminator is required for high-speed production. It does not have heat sealability and requires special treatment before heat sealing. It is made by the tube film method or flat film method, and products made by the flat film method have high strength and uniform thickness. In order to improve performance, multi-layer lamination is usually chosen. It can be laminated with LDPE and PE to enhance barrier properties and used for packaging oil-containing foods.
What is CPP film?
CPP film is cast polypropylene film or unstretched polypropylene film. It is a polypropylene film made by the Cast extrusion process.
During production, polypropylene is melted and poured onto a Chill roll, which is then cooled to form a film. There are many types of CPP film.
Common types include GCPP (general-purpose CPP), MCPP (metalized CPP), and RCPP (re-sealable CPP). CPP film offers numerous advantages, including transparency, glossiness, smoothness, moisture resistance, heat resistance, and low static electricity. It is widely used in daily life, such as packaging for bread, vegetables, stationery, and more. It is also suitable for both traditional and non-traditional packaging applications.It is also used in non-traditional packaging materials such as laminated stacking designs, side-sealed bags, vertical bags for food and textiles, candy twist packaging, and document protection.
This material is non-toxic, odorless, heat-resistant, and moisture-proof, meeting various safety, hygiene, and food safety standards, making it a reliable choice.
Main characteristics of CPP film:
CPP film is highly transparent and glossy. It looks very attractive. It is a very good packaging material.
It has good heat sealing performance and can be used for various types of packaging.
It also has strong tear resistance. It can provide strong protection for packaged products.
Customized production is available. The cast process can produce films of different thicknesses, making it suitable for a wide range of applications.
Excellent heat resistance, can be used for hot filling, cooking bags, and sterile packaging.
Resistant to acids, alkalis, and oils. Can come into contact with food without changing its taste. Suitable for packaging bread and other foods.
Supports a variety of printing styles. Widely used in clothing, food, medicine, clothing, and document confidentiality fields.
Main Differences Between CPP and BOPP Films
CPP films and BOPP films are manufactured differently and have different properties. They differ in strength, durability, barrier properties, physical properties, and heat sealability.
Manufacturing process:
The main difference between CPP and BOPP films is the stretching direction and forming method.
CPP film is manufactured using a cast extrusion process. Polypropylene particles are extruded in a molten state and then rapidly cooled to form a film. The film is stretched in a single longitudinal direction, giving it excellent physical properties, high transparency, and glossiness in the longitudinal direction.
BOPP film is produced through a biaxial orientation process. Polypropylene sheets are stretched simultaneously in the longitudinal and transverse directions at high temperatures. This improves the strength, rigidity, and barrier properties of the film and enhances its physical properties. However, the process is complex and the cost is relatively high.
Strength and Durability:
CPP film has good tear resistance but weak tensile strength.
BOPP film has high tensile strength due to biaxial stretching, making it more puncture resistant and durable.
Barrier Properties
CPP film has average barrier properties and is suitable for applications with low protection requirements.
BOPP film is highly moisture-proof and oxidation-resistant, and is more suitable for preserving perishable items such as food.
Physical Properties
CPP and BOPP films each have their own advantages.
BOPP film has high transparency and glossiness. It has strong ink and coating adhesion and good tensile properties.CPP film is unidirectionally stretched and slightly less transparent than BOPP. However, it has better longitudinal stretching and tear resistance. It has better glossiness, moisture resistance, heat resistance, barrier properties, and mechanical adaptability.
CPP film is suitable for high-temperature retort and low-temperature heat sealing, and is resistant to acids, alkalis, and oils. It is often used in food packaging and is safe for food contact, as it does not alter the flavor of the packaged food.
Heat Sealing Performance
BOPP film has poor heat sealing performance. A coating needs to be added.
CPP film has good heat sealing performance and does not require a coating.
This is because CPP is unidirectionally stretched, so its heat sealing performance is relatively better.
Simply put, BOPP film is not as good as CPP film in terms of heat sealing and requires additional processing to improve its heat sealing performance.
What are the types of BOPP film?
There are more types of Bopp films made with other materials and different process treatments. These different types of BOPP films are used in many applications. The different types of BOPP film are as follows:
Metallized Film:Metallized Film is also a common type of BOPP film, which covers the surface of the BOPP film with an additional layer of metallic film. After covering the film, it will have a metallic luster, and the barrier protection effect is also more excellent. It can effectively block oxygen and moisture. It can be used for wrapping candy, medicine, snacks, and other supplies.
Heat sealing BOPP film: Because ordinary BOPP film does not have Heat Sealability. So, heat-sealing heat-sealable BOPP film can be used to complete shrink wrapping in a heated environment. It has excellent elasticity and can provide effective protection. Heat-sealing BOPP film has high Seal strength and can wrap baked goods, cookies, breads, etc.
Anti-fog BOPP film: Anti-fog BOPP film is manufactured with a unique anti-fog additive. It effectively prevents water from condensing on the inside of the film. It will not produce fog and water droplets even in cold storage scenarios with lower temperatures. It can always maintain good clarity. Commonly used for packaging vegetables, fruits, or frozen food in refrigerated cabinets. It can not only keep food fresh, but also improve the attractiveness of the product.
Pearlescent BOPP film: Pearlescent BOPP film is a kind of white, opaque film. It is mainly used for decoration. It has a certain degree of light blocking, so after wrapping it, it will not be easy to see the products inside the package. BOPP pearl film can be used for wrapping chocolate, candy, ice cream, etc. It can effectively insulate against moisture, bacteria, and so on. It can effectively isolate moisture, bacteria, sunlight, and ultraviolet rays. It can improve the beauty of BOPP film to a great extent.
Printable BOPP film: Printable BOPP film is produced with a unique surface treatment. It makes the surface of BOPP film more printable, and at the same time, has better clarity and gloss. The treated printable BOPP can be printed with clearer and more complex patterns. It is very important for the advertising and the luxury goods and decorations industry.
Holographic BOPP film: Holographic BOPP film is made of Thermoplastic. It can be used to create holographic patterns. It is more visually appealing. Currently, holographic BOPP film is available in opaque and transparent types. It is mainly used for packaging retail items that need to be displayed. It is widely used in cosmetics, food, retail items, tobacco, alcohol, and other gift packaging scenarios. This kind of film will have different colorful visual effects at different angles.
Applications
Applications of BOPP film:
- BOPP film is a biaxially oriented polypropylene film. It has high strength, good barrier properties, and is particularly suitable for printing, so it has a wide range of applications.
- Food packaging: It is commonly used for packaging snacks, baked goods, frozen foods, etc., and can protect food well.
- Labeling: It is also commonly used for labels on containers such as bottles and cans.
- It can also be used for cigarette packs, CDs, and DVDs, serving as a transparent display and protective layer.
Additionally, it is used in food containers, packaging labels and stickers, high-performance textiles, medical plastics, plastic ropes, personal care products, textbook covers, tapes, and moisture-wicking clothing. It plays a significant role in numerous industries.
CPP Film Applications
CPP film is transparent and heat-resistant, making it widely used across various fields.
- Soft packaging: stationery, textile packaging.
- Food packaging: commonly used for snacks, candies, fruits, and vegetables.
- Stationery: can be used to package notebooks and books.
- Textiles: provides excellent protection for clothing and also prevents dust.
Summary
Choose CPP film or BOPP film. It depends on the performance requirements of the packaging and its safety performance. CPP film has excellent transparency, glossiness, and heat sealability, making it ideal for applications that require these characteristics. BOPP film is tough, has good moisture retention, and allows for more refined printing patterns, so it is often used in food packaging and labels. Which one to choose depends on where it will be used.
FAQ
Hello, customers
My name is Jack Yu. I am the Business Manager at BestY Pack Plastic Products. My areas of expertise include film packaging, cold chain transportation packaging, and shrink products. Additionally, our factory manufactures protective gloves, and I can provide you with professional solutions to help you increase your market share and enhance consumer trust.
Email: ﾠjackyu@bestypack.com
Tel: +86 18368319351