1, the reasons for the expansion of outlets
The network expansion in printing is unavoidable. There are two main reasons for the expansion of outlets: one is physical, or mechanical. In the moment of imprinting, the ink on the printing plate outlets will be squeezed. The role of a certain deformation, resulting in the expansion of the network; Another reason is the optical reasons, that is, dot expansion is due to the reflection of light caused by the light in the edge of the ink film dot scattering, so in the visual Produce considerable dot gains. Optical dot enlargement depends on the transparency of the ink, the smoothness of the paper, absorption properties, and the like.
2. Flexonet transmission rules:
In flexo printing, because the elasticity of the photosensitive resin plate used is relatively large, and a certain printing pressure needs to be applied during the printing process, even though light pressure printing is used in the flexographic printing, it still leads to image dot on the printed matter. The extended image expands and causes changes in color and gradation replication. In practice, by measuring and plotting the corresponding flexographic characteristics, it can be seen that the dot expansion in the flexographic printing process is very serious, and the dots below 10% are difficult to control. Therefore, special treatment should be performed for the high gloss region. Should try to flatten the net. Compensation for dot gain can be done at the scanner side or on the imagesetter, preferably on an imagesetter. The edges of the small dots generated after exposure are relatively neat and of good quality.
3. Influencing factors
(1) The number of screen lines increases, and the higher the number of screen lines, the more serious the network expansion.
(2) The size of the printing pressure, the greater the printing pressure, the more serious the dot expansion, and vice versa, the smaller the dot expansion. Therefore, you should try to maintain "zero pressure" in flexographic printing.
(3) Dot shape. Circular dots, square dots, chain dots, and elliptical dots have different dot gains in different gradations. In the flexographic printing, the chain-shaped dots are commonly used; for the small dots in the high-light area, the use of FM dots (FM) works best.
The network expansion in printing is unavoidable. There are two main reasons for the expansion of outlets: one is physical, or mechanical. In the moment of imprinting, the ink on the printing plate outlets will be squeezed. The role of a certain deformation, resulting in the expansion of the network; Another reason is the optical reasons, that is, dot expansion is due to the reflection of light caused by the light in the edge of the ink film dot scattering, so in the visual Produce considerable dot gains. Optical dot enlargement depends on the transparency of the ink, the smoothness of the paper, absorption properties, and the like.
2. Flexonet transmission rules:
In flexo printing, because the elasticity of the photosensitive resin plate used is relatively large, and a certain printing pressure needs to be applied during the printing process, even though light pressure printing is used in the flexographic printing, it still leads to image dot on the printed matter. The extended image expands and causes changes in color and gradation replication. In practice, by measuring and plotting the corresponding flexographic characteristics, it can be seen that the dot expansion in the flexographic printing process is very serious, and the dots below 10% are difficult to control. Therefore, special treatment should be performed for the high gloss region. Should try to flatten the net. Compensation for dot gain can be done at the scanner side or on the imagesetter, preferably on an imagesetter. The edges of the small dots generated after exposure are relatively neat and of good quality.
3. Influencing factors
(1) The number of screen lines increases, and the higher the number of screen lines, the more serious the network expansion.
(2) The size of the printing pressure, the greater the printing pressure, the more serious the dot expansion, and vice versa, the smaller the dot expansion. Therefore, you should try to maintain "zero pressure" in flexographic printing.
(3) Dot shape. Circular dots, square dots, chain dots, and elliptical dots have different dot gains in different gradations. In the flexographic printing, the chain-shaped dots are commonly used; for the small dots in the high-light area, the use of FM dots (FM) works best.
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Makeup Bags
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