1. After the color is not printed or false

In the case of the printed light-colored full-color version, the post-color printing may not be printed or may be false. This may be due to excessive dry oil addition or over-provisioning or semi-finished product stacking time, and the loss of adsorption of the glass-like smooth film on the surface of the ink layer. When printing ordinary inks on gold and silver inks, it not only requires the ordinary inks to be less viscous, but also requires the fixing to be quicker, otherwise there will be hair imaginary failures.

2. Color mixing, hair loss, skinning

In multi-color printing, the interval between the front color and the rear color is short, and it is usually performed in a “wet-press wet” manner. When the viscosity of the latter color ink is greater than the viscosity of the previous color ink, the previous color ink layer will be peeled off, and if the used paper is poor, the hair peeling phenomenon may also occur. When glazing on line, the highly viscous water-based varnish will cause large areas of the imprint on the aluminum foil to peel off.

3. Scuffed and dirty on the back

When printing on aluminum foil, the scratches that appear on the dragged part of the delivery are usually caused by small and uneven paper. However, most of the other bruises are caused by the movement of the prints without thorough drying. The back of the printed product is mainly because the surface of the paper is too smooth, the moisture content of the ink and the paper is too large, or the overprinting of the printed material is not easy to obtain oxygen from the air.

4. Other problems caused by drying

(1) excessive dusting

If water-based glazing is to be done after printing, excessive dusting will make the surface of the printed product rough and not shiny, and it will also cause the printed product to become bloated when it is covered with a film, and the bronzing cannot be hot.

(2) Imprinting is not allowed

With hot air, infrared-dried printed sheets, accurate overprinting is generally not possible at the second overprint.

(3) Hue changes

Whether it is red or white, it will affect the original hue of the ink more or less, and this should be taken into account when proofing or printing high quality products.

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