Film Rolling

Roll film plays a crucial role in the packaging industry. The following is a detailed introduction to roll film:

Definition and Application

1. Definition: Roll film is a general term for packaging films supplied in rolls in the packaging industry. It can also refer to the action of rolling up the film, but this usage is relatively rare.

2. Application: Roll film is mainly used in automatic packaging machines, such as for sachet shampoo and some wet wipes packaged this way. Additionally, in small shops selling cup tea, porridge, etc., roll film is commonly used for on-site sealing packaging machines. The most common roll film packaging is bottle packaging, especially for irregular non-cylindrical bottles, where heat shrink roll film is usually used.

Types and Materials

1. Types: Depending on materials and applications, roll film can be divided into various types, such as PVC shrink film rolls, OPP roll film, PE roll film, PET protective film, composite roll film, etc.

2. Materials: The main raw material for roll film is polyethylene, including low-density polyethylene (LDPE) and linear low-density polyethylene (LLDPE). These materials have properties such as oxidation resistance, UV resistance, and corrosion resistance, making them suitable for roll film production. Additionally, food-grade materials like polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC) are also commonly used for food packaging roll films.

Production Process Flow

1. Extrusion: Raw materials are heated and formed into continuous film through an extrusion production line.

2. Lamination and Printing: Necessary composite layers and printed patterns are added to the film.

3. Winding: The processed film is wound into roll film.

Performance and Requirements

1. Sealing Performance: Roll film needs to have good sealing performance to prevent leakage and contamination of the packaged contents.

2. Moisture Resistance: Roll film should effectively prevent moisture ingress to keep the packaged contents dry.

3. Transparency and Haze: The transparency and haze of roll film affect the product display effect and consumer purchase desire. Therefore, appropriate transparency and haze should be selected according to the specific product requirements.

4. Coefficient of Friction: The coefficient of friction of roll film should be moderate to ensure smooth operation and sealing on automatic packaging machines.

5. Thickness Uniformity: The thickness of roll film should be uniform to ensure packaging stability and consistency.

Applications

1. Food Packaging: Roll film is widely used in food packaging, such as for potato chips, candy, coffee, and cat food.

2. Medical Supplies: Roll film is also commonly used for packaging medical supplies, such as medical dressings and instruments.

3. Industrial Parts: In the industrial field, roll film can be used to package various parts and components.

4. Daily Life: Roll film is also widely used in various daily life scenarios, such as cling film and garbage bags.

Advantages and Features

1. Cost Reduction: The use of roll film can simplify packaging processes and reduce production and transportation costs.

2. Increased Production Efficiency: Roll film is suitable for automatic packaging machines, greatly improving production efficiency.

3. Flexibility and Diversity: Roll film can be customized according to specific product needs, such as material, thickness, and printed patterns.

4. Environmentally Friendly and Recyclable: Some roll film materials, such as PE and PP, can be recycled and reused, meeting environmental protection requirements.

In summary, roll film has broad application prospects and an important market position in the packaging industry. With the continuous development of packaging technology and increasing consumer demands for packaging quality, roll film will continue to develop towards more environmentally friendly, efficient, and personalized directions.