Laminate common faults and troubleshooting

(1) Bad Adhesion and Remedy

1 improper selection of adhesives, improper setting of glue amount, wrong proportioning measurement.

The adhesive brand and coating amount should be re-selected and accurately formulated.

2 The diluent contains hydroxyl-consuming alcohol and water, so that the hydroxyl group of the main agent does not react.

High purity (99.5%) ethyl acetate should be used.

3 The print surface has dusting.

Wipe gently with a dry cloth.

4 print ink layer is too thick.

Should increase the amount of adhesive coating, increase the pressure.

5 Printed ink layer is dry or not completely dry.

Should be hot-pressed again and then gluing; choose a high solid content of the adhesive; increase the adhesive coating thickness; increase the drying temperature and so on.

6 The adhesive is absorbed by printing ink and paper, so that the amount of coating is insufficient.

The formula and coating amount should be reset.

7 plastic film surface treatment is not enough or beyond the application period, so that the treatment surface failure.

Plastic film should be replaced.

8 The pressure is small, the speed is fast, and the temperature is low.

The film temperature and pressure should be increased and the vehicle speed should be appropriately reduced.

(2) Blistering and Remedy

1 Printing ink is dry.

Should be hot-pressed again and then glue; delay filming time, make it completely dry.

2 printing ink layer is too thick.

Should increase the amount of mouth adhesive coating, increase pressure and composite temperature.

3 The drying temperature is too high and the adhesive surface is crusted.

Drying temperature should be reduced.

4 The surface temperature of the composite roller is too high.

The composite roll temperature should be reduced.

5 The film is wrinkled or loose. The film is uneven or curled.

Replace the qualified film and adjust the tension.

6 The film surface is wrapped in dust and impurities.

Dust and impurities should be removed.

7 The adhesive is unevenly coated and used in small amounts.

Should increase the amount of coating and uniformity.

8 high adhesive concentration, high viscosity, uneven coating.

Apply thinner to reduce the binder concentration.

(3) uneven coating and removal methods

1 part of the adhesive curing adhesive.

Replace or add adhesives.

2 pressure is small.

Should increase the compound pressure.

3 roller swelling, deformation.

Replace the roller.

4 plastic film thickness tolerance.

Replace the film and use a film with a small thickness tolerance.

5 The film is slack.

Traction should be adjusted.

(4) Wrinkle film and removal method

1 The film transfer roller is not balanced.

The transfer roller should be adjusted.

2 The film is elastically inconsistent or wavy at both ends.

Replace qualified film.

3 The adhesive layer is too thick and the solvent evaporates incompletely. This affects the viscosity and is squeezed by the pressure roller, causing slippage between the paper (print) and the film.

The amount of glue should be adjusted to increase the temperature of the drying tunnel.

4 The electric roller and the rubber roller are uneven at both ends, and the pressure is inconsistent and the line speed is not equal.

Two rollers should be adjusted.

5 The tension is not enough to make the film trend uneven, it will cause the film to wrinkle, and the pressure should be adjusted to make it normal.

6 The surface of the paint layer on the film is not dry, which can also cause the film to wrinkle. Improve the drying temperature to solve.

7 When the temperature is too high, the film may wrinkle when fed. In the lamination process, the purpose of warming is to soften the film and bond the paper to the plastic film. Fan cooling, turning off the heating wire, or other cooling measures should be taken to restore the temperature to normal as soon as possible.

(5) Corrugated paper and removal methods Papers for coated films are generally coated paper, offset paper, whiteboard paper, and the like. The wrinkling of the paper occurs when the film is covered. Generally, there are the following situations:

1 The workshop's temperature and humidity are not properly controlled. Relative humidity is too high, the paper suction from the "flounce", causing wrinkling of the paper during the coating process, must strictly control the workshop's temperature and humidity.

2 If the ambient temperature is too high or the film temperature is too high, the paper will “tighten” and cause the paper to wrinkle. Press plates can be used to flatten the number of paper knocks and kneading before coating, and reduce the environment and film temperature.

3 Roller pressure is not uniform, causing the paper to wrinkle during the coating process. In this case, correct the roller pressure before starting the operation.

4 The rubber roller itself is uneven, causing the paper in the film to wrinkle. Replace the new rubber roller or grind the old rubber roller and use it again.

5 The dirt on the rubber roller causes the paper to wrinkle when the film is covered. The rubber roller should be cleaned in time. The rubber roller must always be kept clean.

6 If the pulling force is too large, the film is rolled up and torn, causing the paper to wrinkle when it is covered. The tension should be properly adjusted.

7 The paper is skewed, causing the paper to wrinkle when it is covered. The operation must be serious, so that the paper delivery service.