What are the factors of fading and discoloration of ink?
author: Uvink
2022-12-19
What are the factors of fading and discoloration of ink?The fading and discoloration of
printed products are mainly caused by the ink performance. However, some of them are
caused by the art of the printer. During the printing process, the ink color is darker when
the printed product is just printed. However, the color of the ink will fade after a period of
time. This is not the reason why the ink is not light resistant, but mainly the reason why
the ink permeates and forms a film during the drying process. The newly printed product
has a thick ink layer. However, after drying, a large part of the binder in the ink will penetrate
into the interior of the paper fiber, so the ink layer after drying should be thinner, so that
the color will become lighter. When printing, the color should be slightly thicker than the
original color sample, so the ink will meet the requirements of the original color after drying.
What are the factors of fading and discoloration of ink?Discoloration of printing ink due to
lightfastness: When mixing ink, we should try to choose the ink with good lightfastness. Any
printing ink will fade to varying degrees under sunlight or other light sources. When mixing
light color ink, we should estimate the lightfastness of the ink after being diluted. If the products
we print are advertising pictures, publicity pictures, New Year pictures, etc. pasted outdoors,
because these products are directly exposed to the sun, under the action of ultraviolet rays
in the sun, wind and rain, the bright colors that have been printed for a long time are easy to
fade.It is found that only the black and blue ink still exists.
What are the factors of fading and discoloration of ink?Loose and rough discoloration of
paper: If the smoothness of the printed paper is poor, and the surface of the paper is rough
and loose, such as offset paper, relief paper, newsprint, kraft paper, etc., the paper is highly
absorbent, and the particles of ink pigment are small. In the slow drying process, the ink color is
gradually absorbed by the paper along with the connecting material, so the ink color becomes light.
The paper's absorption of ink and the increase of the ink's penetration into the paper will lead to
the separation of the binder and the pigment, which will cause the ink film to become thinner,
discolored, and poor gloss. To reduce the paper's absorption and penetration time, it is necessary
to increase the drying speed accordingly, and increase the amount of red and white dry oil in the ink.
What are the factors of fading and discoloration of ink?Ink is not resistant to acid and alkali
fading and discoloration: malachite blue ink will turn green when encountering acid. The wetting
liquid of offset printing is often acidic, and the pH value is controlled between 4.5 and 6. The acidic
wetting liquid will affect the discoloration of the ink. The ideal PH value of the wetting liquid is 7,
which is neutral. The acidic paper and wetting liquid can also resist the drying of the ink.
printed products are mainly caused by the ink performance. However, some of them are
caused by the art of the printer. During the printing process, the ink color is darker when
the printed product is just printed. However, the color of the ink will fade after a period of
time. This is not the reason why the ink is not light resistant, but mainly the reason why
the ink permeates and forms a film during the drying process. The newly printed product
has a thick ink layer. However, after drying, a large part of the binder in the ink will penetrate
into the interior of the paper fiber, so the ink layer after drying should be thinner, so that
the color will become lighter. When printing, the color should be slightly thicker than the
original color sample, so the ink will meet the requirements of the original color after drying.
What are the factors of fading and discoloration of ink?Discoloration of printing ink due to
lightfastness: When mixing ink, we should try to choose the ink with good lightfastness. Any
printing ink will fade to varying degrees under sunlight or other light sources. When mixing
light color ink, we should estimate the lightfastness of the ink after being diluted. If the products
we print are advertising pictures, publicity pictures, New Year pictures, etc. pasted outdoors,
because these products are directly exposed to the sun, under the action of ultraviolet rays
in the sun, wind and rain, the bright colors that have been printed for a long time are easy to
fade.It is found that only the black and blue ink still exists.
What are the factors of fading and discoloration of ink?Loose and rough discoloration of
paper: If the smoothness of the printed paper is poor, and the surface of the paper is rough
and loose, such as offset paper, relief paper, newsprint, kraft paper, etc., the paper is highly
absorbent, and the particles of ink pigment are small. In the slow drying process, the ink color is
gradually absorbed by the paper along with the connecting material, so the ink color becomes light.
The paper's absorption of ink and the increase of the ink's penetration into the paper will lead to
the separation of the binder and the pigment, which will cause the ink film to become thinner,
discolored, and poor gloss. To reduce the paper's absorption and penetration time, it is necessary
to increase the drying speed accordingly, and increase the amount of red and white dry oil in the ink.
What are the factors of fading and discoloration of ink?Ink is not resistant to acid and alkali
fading and discoloration: malachite blue ink will turn green when encountering acid. The wetting
liquid of offset printing is often acidic, and the pH value is controlled between 4.5 and 6. The acidic
wetting liquid will affect the discoloration of the ink. The ideal PH value of the wetting liquid is 7,
which is neutral. The acidic paper and wetting liquid can also resist the drying of the ink.
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