Prevent Longitudinal Dead Folds in Solvent-Free Laminated Films

Ensuring product quality is crucial in the production process of solvent-free composite films. The appearance of longitudinal dead folds not only affects the appearance of the product but may also impact its performance and usability.

To avoid this issue, the following measures can be taken:

Adjust Tension Control

Ensuring the balance of unwinding and rewinding tension is key to preventing dead folds. By increasing the tension during unwinding and rewinding, the film's shrinkage during the composite process can be reduced, thus lowering the likelihood of dead folds. Simultaneously, closely monitoring and adjusting the tension is necessary to ensure stability throughout the production process.

Preheat the Film

By activating the preheating device at both the primary and secondary unwinding sections, the film can become softer before entering the composite area. This not only reduces the internal stress of the film but also improves the quality of the composite product. Preheating also helps to enhance the film's extensibility, making it easier to flatten and reducing the occurrence of dead folds.

Increase Production Speed

The high-speed production capability of solvent-free composite equipment is one of its design highlights. By increasing the speed, the film can pass through the composite area more quickly during the coating process, reducing the time window for wrinkle formation. Simultaneously, to ensure the quality of coating under high-speed production, the temperature of the glue roller can be appropriately increased to ensure the fluidity of the glue and the evenness of the coating.

In addition to the above measures, the following points can be considered:

Optimize Glue Formulation

Selecting an appropriate glue formulation is crucial for reducing the internal stress of the composite film and improving product quality. Experiments can be conducted to determine the optimal glue formulation to ensure the flatness and strength of the composite film.

Equipment Maintenance and Calibration

Regular maintenance and calibration of production equipment are essential to ensure the normal operation and accuracy of all components. This can reduce production problems due to equipment failure or wear.

Quality Monitoring System

Introducing an advanced quality monitoring system to monitor key parameters in real-time during the production process, such as tension, temperature, and speed, can promptly detect and resolve issues that may cause dead folds.

By comprehensively applying the above measures, the occurrence of longitudinal dead folds in the production of solvent-free composite films can be effectively prevented, thereby improving product quality and production efficiency.