CPP（Cast Polypropylene）and BOPP（Biaxially Oriented Polypropylene） are two common types of polypropylene film materials that have some differences in their manufacturing processes and performance.

 

1. Manufacturing process

 

CPP: CPP film is produced by extruding molten polypropylene through an extrusion machine, followed by cooling and solidification. The manufacturing process is relatively simple.

 

BOPP: BOPP film is produced by first extruding molten polypropylene into a film through an extrusion machine and then subjecting it to stretching and orientation processes in two directions to achieve better stretchability and transparency.

 

2. Characteristics and Applications:

 

CPP: CPP film has high transparency, flexibility, and heat resistance. It is commonly used for packaging food, pharmaceuticals, and industrial products. It can also be used for making bags, folders, and other items.

 

BOPP: BOPP film has high tensile strength, transparency, and rigidity. It is widely used in packaging, labels, etc.

 

In summary, CPP film is suitable for applications that require flexibility and heat resistance, while BOPP film is suitable for applications that require good stretchability and rigidity. The choice between the two depends on the specific requirements and application scenarios of the product.tapes, printing, and composite materials. It is suitable for applications that require high strength and print quality.

 

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Most traditional sanitary napkin manufacturers use release paper combined with film packaging for sanitary napkins. The advantage of this type of packaging is its lower production cost, making it affordable for the majority of consumers. The release paper can also effectively protect the adhesive surface before use.

 

With the continuous increase in people's income levels, consumers have higher expectations for product quality, especially concerning hygiene and healthy. During the production and cutting process, release paper inevitably produces fine paper scraps, which can lead to finished product contamination and pose hygiene and safety risks.

 

PE release film or PE siliconized pouch film can effectively block bacteria and pollutants, and also effectively block moisture. While protecting the adhesive surface, it keeps the sanitary napkin dry.

 

The use of PE release film can reduce paper consumption, thereby protecting forest resources and the natural environment.

 

Furthermore, PE release film has good tear resistance, making it convenient for users to tear off and discard, with simple operation and no inconvenience caused.

 

Some PE release films can be biodegradable, making them environmentally friendly and reducing their impact on the environment.

 

In summary, the use of PE release liners in sanitary napkins can provide excellent protective effects, maintain healthy, and have good tearability and environmental performance, providing a better user experience for women during menstruation.

 

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Release films and release papers are both used to provide a non-sticky surface for easy release from adhesives or other sticky materials, but they differ in terms of material and application. Here are the main differences between release films and release papers:

 

Material: Release films are typically made of polymer materials, such as polyethylene terephthalate (PET) or polypropylene (PP). These films have a low surface energy and are coated with a release agent to prevent adhesion. Release papers, on the other hand, are paper-based materials that are coated with a release agent, often silicone, to provide a non-stick surface.

 

Thickness and Flexibility: Release films are generally thinner and more flexible compared to release papers. They are available in various thicknesses, ranging from microns to a few millimeters, and can be easily conformable to different surfaces. Release papers are typically thicker and less flexible due to their paper-based nature.

 

Applications: Release films are commonly used in industries such as adhesive manufacturing, coating processes, or any application where a non-stick surface is required. They are often used as liners for adhesive tapes, labels, or in the production of composite materials. Release papers, on the other hand, find applications in various industries such as graphic arts, labels, decals, and composite molding. They are often used as a protective layer or backing for adhesive products.

 

Release Properties: Both release films and release papers are designed to provide a non-stick surface, but their release properties may vary. Release films generally offer a more consistent and controlled release due to their uniform surface and precise coating of release agents. Release papers, being paper-based, may have a slightly rougher surface and can exhibit variations in release performance.

 

It's important to note that the specific characteristics and properties of release films and release papers can vary depending on the manufacturer, coating technology, and intended application.

 

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