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11

    
2023

    

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04





    

    

    Common Problems and Solutions of BOPP Pre-coating Film


    

    Author:


    

    








    
1. The product has wrinkles
(1) The pressure of the rubber roller is too large, causing the film to deform, and the pressure should be appropriately reduced.
(2) If the surface of the rubber roller is damaged or uneven, the rubber roller should be replaced.
(3) The pressure between the rubber roller and the heating roller is unbalanced and should be properly adjusted.
(4) The tension on both sides of the film is inconsistent, or there are wavy edges, the film material should be replaced.
2. Snowflake spots appear on the product
(1) The pressure of the rubber roller is not enough, the pressure should be increased appropriately.
(2) The glue on the pre-coated film is not completely melted, which can be solved by the following methods.
① Increase the film temperature appropriately.
② Increase the contact area between the film and the heating roller to increase the degree of heating and melting of the adhesive on the film at the same speed.
③ Reduce the laminating speed.
(3) There are dust and impurities on the gluing surface of the pre-coating film, which should be removed in time.
3. The adhesion is not strong, and the film is removed.
(1) If the pre-coating film exceeds the shelf life, replace it with a new pre-coating film.
(2) if the ink layer of the printed matter is not dry, the drying time of the printed matter should be extended, especially when the special printed matter is covered with film.
(3) The laminating pressure is small, the speed is fast, and the temperature is low. The laminating pressure can be appropriately increased, the laminating speed can be reduced, and the laminating temperature can be increased.
4. Product curling after slitting
(1) the film tension is too large, so that the film produces telescopic deformation, should be adjusted to the film tension screw.
(2) The winding tension is large, which causes the film and paper to deform at the same time. The winding tension mechanism should be adjusted.
(3) If the ambient humidity is high, the humidity in the production workshop should be controlled at about 60%.
(4) The drying time is short, and the drying time should be appropriately extended. After the coated product is completely dried and cooled on the winding roller, the film is cut and cut.



   



    

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