In the post-printing process, the glazing process can not only increase the appearance of the finished product, but also play a protective role. The following is a brief analysis of some problems that occur during the glazing process.

Poor gloss of film-forming film

If it is the quality problem of the varnish, you should consider switching to a better quality varnish according to the process and economic requirements; if the coating is too thin, the coating amount is insufficient or the varnish concentration is small, the roughness is high, The surface of the printed matter with strong absorption is not easy to fill and fill, so the coating amount should be increased to increase the concentration of the coating, or a layer of glazing primer should be applied before processing, and then the glazing coating may be glazed coating. When the temperature of drying and calendering is low, and the calendering pressure is small, the process parameters should be adjusted during the operation to increase the temperature and increase the pressure; it is also estimated that it is the cause of the equipment itself. If the calendered steel belt is worn, the gloss is smooth If the degree drops, it is necessary to repair and improve the surface condition of the calendered steel strip.

After calendering, the blank part of the printed product is a light part, and the light part is discolored

The glazing solvent has a certain dissolving effect on the ink layer. This requires changing the type of glazing oil or changing the solvent composition. If the ink is poorly dried and the ink layer has poor resistance to dissolution, it is necessary to improve the ink drying situation. Wait for the ink to dry before glazing Coating, to reduce the amount of solvent that has a dissolving effect on the ink in the glazing oil; the layer is not completely dried, and the residual amount of solvent in the film layer is high, then the drying temperature during glazing coating should be increased or the machine speed should be reduced to extend the drying time To reduce the amount of residual solvent in the coating.

Foaming on the membrane

In the calendering process, the pressure is too high, and the temperature of the calendered steel strip is too high, which partially softens the glazing film layer. This needs to appropriately reduce the pressure and temperature of the glazing; it may also be that the glazing oil does not match the calendering process conditions After cooling the glazing layer on the surface of the printed matter, the peeling force of the glazing belt is poor. It is necessary to change the process conditions to match the glazing oil, reduce the calender speed, and improve the peeling between the glazing layer and the glazing belt force.

After the printed product is calendered, the surface is easy to crack

The high temperature makes the printed matter dehydrated too much during calendering, and the water content is reduced, so the paper fiber becomes brittle. The working temperature of calendering should be reduced, and effective measures should be taken to maintain a certain moisture content in the printed product; pressure during calendering If it is too large, the extensibility and plasticity of the printed matter will be reduced, and the toughness will be modified, which can reduce the pressure in the calendering; if the post-processing adaptability of the varnish is poor, you should choose a varnish with better processing adaptability The processing conditions are not suitable for sample selection. The post-processing conditions can be adjusted to match the suitability of the printed product after calendering.

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