Equipment Operation
The new semi-automatic pre-coating film laminating equipment is designed with an automatic hydraulic system, making it easy to adjust the lamination pressure. The film is heated using either heat transfer oil or a quartz tube, ensuring stable and adjustable temperature control. The unwinding knife and slitting knife are mounted on the unwinding frame, allowing for automatic cutting after the film is coated. The machine uses a frequency conversion motor, providing smooth and reliable performance.
To operate the machine, first install the pre-coated film on the central part of the unwind roller and secure both ends. Adjust the pressure to ensure the film remains stable during operation. Place the tool holder according to your needs to cut excess material. On the conveyor belt, position the paper properly to ensure smooth feeding without misalignment. Adjust the tension of the pre-coated film on the unwind frame, then feed the paper into the front pressure roller assembly through the guide roller. The paper is then combined with the pre-coated film under heat and pressure. After passing through the post-rolling roller, the film is slit by the movable pressure roller and falls onto the collection table. The receiving platform can be tilted outward, and a vibration motor can be installed underneath to keep the finished product neatly stacked.
When laminating thick paper, it should be directly passed through the back pressure roller. For thin paper, use the adjustment roller to shape the paper before applying pressure.
Equipment Adjustment
Temperature adjustment is crucial for optimal performance. The laminating machine should maintain a temperature around 70°C. When the red light on the temperature controller turns on, it indicates that the desired temperature has been reached, and production can begin. For pressure adjustment, the front pressure roller is controlled by an automatic hydraulic pump, and the pressure can be adjusted using a rotary switch. The pressure is typically set between 1 to 15 MPa. The back pressure roller uses an eccentric gear mechanism, and the handle can be moved to adjust the pressure. The movable pressure roller uses a cam mechanism, and the handle can be moved to separate the two rollers.
The tension of the conveyor belt can be adjusted using a square steel shaft for the front belt and by moving the integral slider for the rear belt. The distance between the movable pressure roller and the rear pressure roller is adjusted using a handwheel. To synchronize the front and rear pressure rollers, the rear roller moves via a friction mechanism, and the friction force can be adjusted at the opposite end. Rotating the small pressure handle ensures synchronization between the two rollers.
Common Film Issues and Solutions
If the finished product shows wrinkles, it may be due to improper adjustment of the front and rear pressure rollers, uneven pressure, or paper shrinkage. Adjusting the pressure or treating the paper with humidity can resolve this issue. If the surface is uneven, it could be caused by excessive film temperature or pressure. Adjusting these parameters will help. If fog or bubbles appear on the surface, it may be due to low film temperature, insufficient pressure, or excessive talc powder on the paper. Increasing the temperature and pressure or using high-quality paper can solve this. If plastic burrs appear, it is likely due to excessive pressure from the front and rear rolls. Reducing the pressure will fix the problem. If the film peels off during reuse, it might be because the pressure is too low or the ink on the paper is not fully dry. Increasing the pressure and ensuring the ink is dry before laminating can prevent this.
This concludes the operational analysis of the new semi-automatic pre-coating film laminating equipment.
The above content is selected from Keyin Media. Printing Technology ·Digital Graphic Arts , No. 5, 2012. For more journal content, please pay attention to the journal channel .
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