Plastic film friction coefficient test method - Database & Sql Blog Articles

Plastic Film Friction Coefficient Test Method

In the production of films and plastic packaging bags, the friction coefficient of plastic film is a critical parameter. It plays a key role in evaluating the opening performance of the film alongside anti-blocking properties. Additionally, it serves as an essential reference for adjusting the tension and ensuring smooth operation during automated packaging processes. As modern production becomes increasingly automated, the demand for accurate friction coefficient measurements has grown significantly. For manufacturers of plastic films and flexible packaging, precise determination of this property has become a standard requirement.

Currently, there are two main approaches used by domestic manufacturers to measure the friction coefficient: purchasing a dedicated friction coefficient meter or using a multi-functional tensile testing machine equipped with a specialized friction device. While some companies understand the former, they often find it expensive and underutilized due to limited application. Moreover, such devices require dedicated space, trained personnel, and ongoing maintenance, which adds to the overall cost. This raises the question: is there a more cost-effective and practical solution?

Interestingly, the national standard GB 10006-88, issued by the former Ministry of Light Industry in 1988, already provides a well-established method for measuring the friction coefficient of plastic films and sheets. This method is widely used in industries such as petrochemicals, where multi-purpose equipment like tensile testing machines is commonly employed. The basic principle involves placing two surfaces flat against each other and measuring the force required to move them under a specific contact pressure. This same principle can be adapted for use on tensile testing machines with minimal modifications.

The test setup includes a horizontal test bench, a slider, and a load sensor. A pulley system is added to redirect the pulling force from the horizontal to vertical direction, allowing the friction test to be conducted within the existing tensile testing machine framework. This approach eliminates the need for additional standalone equipment, making it both economical and efficient.

Key considerations when using a tensile testing machine for friction coefficient measurement include:

• Sensor Selection: A 10 N load cell is recommended, as most friction tests require only a few Newtons of force. Using a 200 N or 100 N sensor would lead to significant measurement errors.
• Mounting Setup: The friction test board must be securely fixed at the lower end of the tensile machine, ensuring that the pulley aligns properly and remains level.
• Software Support: The tensile machine should be equipped with software capable of processing and analyzing the friction data accurately.

By implementing this method, manufacturers can convert their existing tensile testing machines into multifunctional tools without the need for extra investment. This not only reduces costs but also improves efficiency in quality control and product development. For laboratories involved in flexible packaging, this is a practical and cost-effective way to perform friction coefficient testing while maintaining high accuracy and reliability.