CPP film (Cast Polypropylene Film) and BOPP film (Biaxially Oriented Polypropylene Film) are two common materials in the packaging industry that are similar in many ways, but also have some key differences. In this article, we will discuss these two film materials in depth, and make a comprehensive comparison from the production process, physical properties, application areas and many other aspects, in order to help you better understand the similarities and differences between them.
Cpp film vs Bopp film
What is cpp film
CPP film, or cast polypropylene film, is a polypropylene film produced using the extrusion casting method. This process results in a film with uniform thickness and good transparency. Due to the special nature of the preparation process, CPP films usually have high flexibility and heat sealability.
What is BOPP film
BOPP film, or bi-oriented polypropylene film, is a polypropylene film produced using the bi-oriented stretching method. This process gives BOPP films higher strength and stiffness, as well as better optical properties.
Comparison of Production Processes
CPP Film Production Process: Extrusion – Cooling – Curing
BOPP film production process: Extrusion – Stretching – Orientation
The difference between the two production processes directly affects the final physical properties and application.
Comparison of Physical Properties
a. Transparency and gloss
CPP film: good transparency, suitable for packaging that requires high appearance and texture.
BOPP film: has a high gloss, making it ideal for advertising posters and high gloss packaging.
b. Strength and Stiffness
CPP film: Relatively soft, suitable for packages requiring good foldability and bendability.
BOPP film: Higher strength and stiffness, suitable for packages requiring better stackability and tearing.
Comparison of application areas
a. Food Packaging
CPP film: commonly used in food packaging, such as snack bags, due to its good heat sealability.
BOPP film: Suitable for food packaging that requires high clarity and gloss.
b. Printing and advertising
CPP film: Suitable for packaging that requires printing texture and tactility, such as specialty posters.
BOPP film: Used for high quality advertising printing due to its high gloss level.
c. Pharmaceutical Packaging
Both CPP film and BOPP film have good cleanliness and non-toxicity, which can be used for pharmaceutical packaging to ensure the safety of drugs.
Environmental protection and recyclability
CPP film: Good recyclability due to its relatively simple production process.
BOPP film: more difficult to recycle due to the special treatment of orientation and stretching, with a higher impact on the environment.
Conclusion
When choosing between cpp film vs bopp film, you need to weigh the advantages and disadvantages according to your specific packaging needs. If you’re looking for softness and heat sealability, CPP film may be a better choice, while if you’re more interested in strength, gloss and clarity, then BOPP film may be more in line with your requirements.