Common malfunctions and treating method of solventless laminating

White spot

1.Insufficient gluing amount

Increase the gluing amount, adjust the laminating temperature and pressure

1.Poor smoothness or uncleaned roller at the coating and laminating area

Determine the location of foreign objects by measuring two repeating spots, and clean them thoroughly

1.Uneven tension of the substrate film

Adjust the flattening roller, adjust the tension appropriately, or replace the film

1.Poor compatibility between ink and adhesive

Replace the adhesive or use compatible ink

Adhesive not drying

1.Incorrect ratio

Follow the requirements of the adhesive manufacturer

1.Adhesive failure

Replace the adhesive

1.Adhesive mixed with water or a large amount of ethylene acetate

Replace the adhesive

Low peel strength

1.Selection of adhesive

Select appropriate adhesive according to its purpose

1.Adhesive coating and gluing amount

Ensure even coating and sufficient gluing amount

1.Adhesive ratio

Strictly follow the requirements of the adhesive manufacturer

1.Surface tension (corona value) of composite substrate

The surface tension requirement of the substrate is usually greater than 38 dynes, if not, the substrate surface tension needs to be increased

1.Influence of additives in substrate

Be careful when testing substrate quality

1.Incomplete curing

Strictly follow the requirements of the adhesive manufacturer for curing. If the adhesive ratio is incorrect, the product may be entirely discarded

Bubbles

1.Humidity

Dehumidify during the production process when the relative humidity is greater than 85% HR, and reduce the exposure time of the Hygroscopic substrate in the air

1.Control of adhesive

Strictly follow the requirements of the adhesive manufacturer

1.Substrate reasons

Ensure the quality of the substrate and select appropriate adhesive

1.Laminating process

Control laminating pressure, rewinding tension, coating and laminating temperature, and pay special attention to machine speed when splicing

1.Mechanical reasons: roller aging, deformation, damage, etc.

Needs to be replaced or repaired in a timely manner

1.Poor workshop environment, dust adheres to the film surface

Change the environmental hygiene or build a separate room

1.Excessive residual solvent content of printing film

The residual content should generally be less than 3mg/O

Wrinkles

1.Low initial viscosity of adhesive, easy to slip

Adjust the tension according to the composite material for each composite

1.Composite substrate itself

Adjust the tension and flattening roller within the adjustable range

1.Laminating process:Unequal tension between two substrates, inappropriate rewinding tension.

Adjust to appropriate tension.

1.Equipment reasons: A: Unclean roller surface. B: Roller not level enough

A:Clean the roller surface.

B:Adjust the level

Uneven end surface

1.Insufficient storage time of the substrate.Unstable performance

Check substrate quality carefully

1.Unsuitable rewinding tension and taper. Insufficient friction between film layers

Adjust to appropriate rewinding tension and taper

1.Static electricity between film layers

Add electrostatic remove device.

1.Uneven size of substrate film roll

Adjust the flattening roller within the adjustable range, and replace the substrate if necessary.

1.Excessive gluing amount

Adjust to appropriate gluing amount

1.Operational error.

Strictly follow the equipment operating procedures.