BOPP precoating common problems and solutions.

1. The product has wrinkles
(1) The pressure of the rubber roll is too large, resulting in the deformation of the film, so the pressure should be properly reduced.
(2) The surface of the rubber roll is damaged and uneven. Replace the rubber roller.
(3) The pressure imbalance between the rubber roll and the heating roll should be properly adjusted.
(4) If the tension on both sides of the film is inconsistent, or the edge is corrugated, the film material should be replaced.

2. Snowflake spots appear on the product
(1) The pressure of the rubber roll is insufficient, so the pressure should be increased appropriately.
(2) The incomplete melting of glue on the pre-coated film can be solved by the following methods.
① Increase the paint film temperature appropriately.
② Increase the contact area between the film and the heating roller, and increase the heating and melting degree of the adhesive on the film at the same speed.
③ Reduce the coating speed.
(3) Dust and impurities on the glued surface of the pre-coated film should be removed in time.

3. The adhesion is not strong, and the film is peeled off
(1) If the shelf life of the pre-coated film exceeds the shelf life, please replace the new coating film.
(2) If the printing ink layer is not dry, the drying time of the printing matter should be extended, especially when laminating special printing matter.
(3) Low laminating pressure, fast speed, low temperature. The laminating pressure can be increased appropriately, the laminating speed can be reduced, and the laminating temperature can be increased.

4. Curl the product after cutting
(1) The film tension is too large, will lead to film stretching and deformation. Adjust the tension screws for the film.
(2) the winding tension is large, resulting in the film and paper deformation at the same time, should adjust the winding tensioning mechanism.
(3) The environmental humidity is high, and the humidity of the production workshop should be controlled at about 60%.

(4) Short drying time, should be appropriate to extend the drying time. After the coated product has been completely dried and cooled on the winding roller, the film is cut and sliced.