Common Problems and Solutions for Laminating Machines

Laminating machines can be divided into two main types: wet lamination machines and pre-coating lamination machines. They are special equipment used for laminating paper, boards, and mounting films. The process involves pressing the materials together using rubber rollers and heated rollers, forming a unified paper-plastic product.

What should you do when problems arise with the laminating machine? What are the common issues that can occur?

1. Curling of laminated products:

Possible causes:

- Thin printed material: Avoid laminating thin paper as much as possible.

- Imbalanced tension: Adjust the tension of the film to achieve balance.

- Excessive composite pressure: Reduce the pressure appropriately.

- High temperature: Lower the composite temperature.

- Excessive film tension: Excessive tension on the film can cause elongation deformation, leading to the product bending towards the film side after external forces are removed. The solution is to adjust the tension adjustment screw depth to reduce braking force.

- Excessive winding tension: Excessive winding tension can cause deformation of the film and printed material, but the amount of deformation is different. After the external force is removed, the product will bend towards the side of the paper, especially with thin paper. The solution is to reduce the friction between the winding drum and the film.

- High humidity in the environment: When laminating products with high moisture content are sufficiently dried, the paper may undergo moisture loss deformation, causing the product to bend towards the side of the paper. Control the humidity in the workshop.

- Insufficient drying time: Insufficient drying time can cause bending of laminated products. The solution is to extend the drying time.

2. Snowflakes on the product:

Possible causes:

- Excessive powder spraying: Excessive powder spraying on the printed material cannot be completely dissolved by the adhesive, resulting in large area snowflakes on the laminated product. In such cases, consider increasing the amount of adhesive or removing the powder from the printed material before lamination.

- Insufficient adhesive application: Insufficient adhesive application can result in snowflakes appearing on the entire surface of the printed material. The solution is to increase the amount of adhesive appropriately.

- Inappropriate pressure on the rubber roller: Excessive pressure on the rubber roller can squeeze out adhesive from the edge of the printed material, resulting in snowflakes. Insufficient pressure can also cause snowflakes. Adjust the pressure on the rubber roller correctly.

- Dry adhesive on the adhesive roller: The local area with dry adhesive on the adhesive roller will have less adhesive, resulting in snowflakes on the laminated product at that spot. Clean the adhesive roller.

- Glue rings on the pressure roller: Adhesive squeezed out from the edge of the printed material or from the film hole can stick to the pressure roller and form dry adhesive rings over time. When laminating subsequent printed materials, small snowflakes may appear at these spots. Clean the pressure roller in a timely manner.

- Impurities in the adhesive: If there is too much dust in the surrounding environment or if the adhesive contains dry adhesive and film fragments, snowflakes may appear on the laminated product. Pay special attention to environmental cleanliness. Unused adhesive should be sealed in the adhesive bucket, or filtered before application.

3. Bubbles on the product:

- Insufficient drying of ink layer: Heat-pressing once before lamination can elongate the drying time and ensure complete drying.

- Excessive thickness of the ink layer: Can add