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what is the different between White BOPP and White PP?

Hits: 217 Date:2023-08-15

Both White BOPP (Biaxially Oriented Polypropylene) and White PP (Polypropylene) are types of plastic films, but they have some differences based on their composition, manufacturing process, and characteristics. Let's explore the differences between the two:

Material Composition:

White BOPP: BOPP is a type of polypropylene film that has been stretched in both the machine direction (MD) and transverse direction (TD), resulting in enhanced strength, clarity, and printability. White BOPP has an added white pigment or coating to give it an opaque white appearance.

White PP: White PP refers to a white-colored polypropylene material. It might refer to solid white polypropylene sheets or films, without the specific biaxial orientation that BOPP undergoes.

Manufacturing Process:

White BOPP: BOPP is manufactured through a process that involves extruding polypropylene to form a thin film, followed by stretching in both MD and TD directions. The stretching process aligns the polymer molecules, improving the film's mechanical properties and optical characteristics.

White PP: White PP can be produced as sheets or films through extrusion, but it might not undergo the biaxial stretching process that BOPP goes through. This can result in differences in properties like clarity, stiffness, and printability.

Characteristics:

White BOPP: BOPP films, including white BOPP, are known for their high tensile strength, excellent clarity, good moisture barrier properties, and printability. The biaxial orientation contributes to their mechanical strength and dimensional stability.

White PP: White PP sheets or films might have slightly different characteristics depending on the manufacturing process. They can still offer good stiffness and chemical resistance, but they might not have the same level of clarity or printability as BOPP films.

Applications:

White BOPP: White BOPP is commonly used for packaging applications where an opaque white appearance is desired, such as labels, food packaging, and various consumer goods packaging.

White PP: White PP sheets or films are often used in applications where the material's white color and inherent properties are important, such as signage, stationery, and other non-packaging applications.

In summary, the main difference lies in the manufacturing process and resulting properties. White BOPP is a specific type of polypropylene film that undergoes biaxial orientation, while White PP can refer to solid white polypropylene sheets or films without the specific orientation process. The choice between the two would depend on the specific requirements of the intended application.


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