(1) The ink pigment particles are too thick and too hard, and the friction on the plate surface is large. Especially for the fine dots, the scratches damage the pattern ink-absorbing foundation and cause a flower pattern. Some pigments have slight corrosion to the layout, and the ink-absorbing foundation that damages the pattern of the layout will also cause floral patterns.
(2) Insufficient oiliness of the ink, weak ability to resist the acidic liquid, and the ink layer on the basis of the layout pattern is invaded by the acidic liquid to cause a flower pattern.
(3) The viscosity of the ink is not suitable, and the viscosity of the ink is too large. The cohesion of the ink is also large. During the transfer process, the ink layer is not easily broken, resulting in insufficient ink layer on the basis of the layout pattern and the flower pattern; the viscosity is too small, the ink is on the layout The adhesion is not strong, the layout of the layout of the foundation can not be protected by the remaining ink layer, the pattern of the foundation is directly invaded and friction caused by the acidic version of the flower.
Approach:
(1) The ink has low oiliness, low viscosity and low adhesion. Commonly used in black ink and 915 ink, some 05-90 or 05-93 bright paste can be added to improve performance (black ink should not exceed 10%).
(2) The viscosity of the ink is too large, resulting in the lack of residual ink layer on the plate and the flower pattern. Adding No. 6 varnish or Kangbang can be used to improve.
(3) Ink pigment particles are too coarse and corrosive (eg chrome yellow ink). Replace the ink or grind the ink before use.
3. Phenomenon and cause of paste: When the paste version is unclear, the dot lines are widened, and the neighboring meshes are merged with each other, so that the printed ink is dark and thick and the level is reduced. The reasons for stencil are: In addition to the fact that the syrup is too hot, the pressure of the roller is too large, and the blanket is too loose, the following reasons are commonly caused by the ink:
(1) The ink is adjusted too thinly and the texture is too loose. The cohesion is small, and it is easy to spread outwards, resulting in the expansion of dots and lines.
(2) When the amount of ink under the ink is large, and it exceeds the amount of ink that can be accommodated in the layout pattern, it spreads out to cause a paste.
The fine mesh printing should strictly control the ink quality, otherwise it is very easy to paste. (3) The ink pigments are too thick or too heavy, and the transfer performance of the linking material is reduced, resulting in deposition on the plate surface blocking outlets. On the other hand, because the particles are too thick, the fine mesh can not accommodate and expand outwards, and at the same time, the friction on the plate increases, destroying the hydrophilic properties of the blank parts and making them feel fat, causing the adjacent dots to merge and paste.
(4) The weight of the ink makes the blank part of the plate feel fat and produces a paste plate. If too much auxiliary material is added to the ink, the viscosity of the ink may be reduced, the ink may become loose, and the oiliness of the ink may increase.
(5) The ink accumulates on the plate, blocking the gaps in the dots, expanding the lines, and causing stencils.
Approach:
(1) Paste of ink occurs frequently in gold and red ink, and some gum arabic may be properly added in the water bucket. Can also be diluted with 915 Wei Li oil and 05-93 light pulp half, the use of better results. Most of the ink is too thin, resulting in the paste is too thin and the resulting paste, replace the new ink or add some concentrated ink.
(2) When the ink is large, the color of the ink can be adjusted to reduce the amount of ink.
(3) Reduce the use of accessories such as Kangbang to control the paste.
(4) The stencils caused by the stack are to be resolved from the root cause of the heap.
4. Reasons for deinking and deinking: Deinking means that the ink does not rotate with the ink fountain in the ink fountain, but separates from the ink fountain shaft so that the ink string roller and the uniform ink roller do not ink. Saying that ink will affect the normal ink transfer roller, so that the printing plate can not get the desired ink and fade, resulting in different shades of ink. Common deinking has the following reasons:
(1) Insufficient oiliness and low viscosity of the ink cannot drive the ink to move with the rotation of the ink fountain shaft, causing deinking.
(2) The ink has poor fluidity and does not easily flow between the ink cutter shaft and the blade, affecting the ink under the ink.
(3) The ink is gelled into a jelly state, which reduces the viscosity and fluidity and loses the printing performance, while the stationary ink causes deinking on the ink fountain.
(4) The ink contains too little oil, too much fines, and does not transfer pigment particles well and stays in the ink fountain to form deinking.
(5) The ink dries too fast, which causes the ink fountain shaft to dry and solidify, loses ink transmission performance, and blocks the gap between the ink fountain roller and the blade to form deinking.
(6) Too much impurities such as ink, residue, etc. in the ink block the gap between the ink fountain and the blade, affecting the formation of deinking under the ink.
(7) The water bucket syrup is too acidic or the gum arabic ink is too much ink.
(8) The layout is too watery. (To be continued)
(2) Insufficient oiliness of the ink, weak ability to resist the acidic liquid, and the ink layer on the basis of the layout pattern is invaded by the acidic liquid to cause a flower pattern.
(3) The viscosity of the ink is not suitable, and the viscosity of the ink is too large. The cohesion of the ink is also large. During the transfer process, the ink layer is not easily broken, resulting in insufficient ink layer on the basis of the layout pattern and the flower pattern; the viscosity is too small, the ink is on the layout The adhesion is not strong, the layout of the layout of the foundation can not be protected by the remaining ink layer, the pattern of the foundation is directly invaded and friction caused by the acidic version of the flower.
Approach:
(1) The ink has low oiliness, low viscosity and low adhesion. Commonly used in black ink and 915 ink, some 05-90 or 05-93 bright paste can be added to improve performance (black ink should not exceed 10%).
(2) The viscosity of the ink is too large, resulting in the lack of residual ink layer on the plate and the flower pattern. Adding No. 6 varnish or Kangbang can be used to improve.
(3) Ink pigment particles are too coarse and corrosive (eg chrome yellow ink). Replace the ink or grind the ink before use.
3. Phenomenon and cause of paste: When the paste version is unclear, the dot lines are widened, and the neighboring meshes are merged with each other, so that the printed ink is dark and thick and the level is reduced. The reasons for stencil are: In addition to the fact that the syrup is too hot, the pressure of the roller is too large, and the blanket is too loose, the following reasons are commonly caused by the ink:
(1) The ink is adjusted too thinly and the texture is too loose. The cohesion is small, and it is easy to spread outwards, resulting in the expansion of dots and lines.
(2) When the amount of ink under the ink is large, and it exceeds the amount of ink that can be accommodated in the layout pattern, it spreads out to cause a paste.
The fine mesh printing should strictly control the ink quality, otherwise it is very easy to paste. (3) The ink pigments are too thick or too heavy, and the transfer performance of the linking material is reduced, resulting in deposition on the plate surface blocking outlets. On the other hand, because the particles are too thick, the fine mesh can not accommodate and expand outwards, and at the same time, the friction on the plate increases, destroying the hydrophilic properties of the blank parts and making them feel fat, causing the adjacent dots to merge and paste.
(4) The weight of the ink makes the blank part of the plate feel fat and produces a paste plate. If too much auxiliary material is added to the ink, the viscosity of the ink may be reduced, the ink may become loose, and the oiliness of the ink may increase.
(5) The ink accumulates on the plate, blocking the gaps in the dots, expanding the lines, and causing stencils.
Approach:
(1) Paste of ink occurs frequently in gold and red ink, and some gum arabic may be properly added in the water bucket. Can also be diluted with 915 Wei Li oil and 05-93 light pulp half, the use of better results. Most of the ink is too thin, resulting in the paste is too thin and the resulting paste, replace the new ink or add some concentrated ink.
(2) When the ink is large, the color of the ink can be adjusted to reduce the amount of ink.
(3) Reduce the use of accessories such as Kangbang to control the paste.
(4) The stencils caused by the stack are to be resolved from the root cause of the heap.
4. Reasons for deinking and deinking: Deinking means that the ink does not rotate with the ink fountain in the ink fountain, but separates from the ink fountain shaft so that the ink string roller and the uniform ink roller do not ink. Saying that ink will affect the normal ink transfer roller, so that the printing plate can not get the desired ink and fade, resulting in different shades of ink. Common deinking has the following reasons:
(1) Insufficient oiliness and low viscosity of the ink cannot drive the ink to move with the rotation of the ink fountain shaft, causing deinking.
(2) The ink has poor fluidity and does not easily flow between the ink cutter shaft and the blade, affecting the ink under the ink.
(3) The ink is gelled into a jelly state, which reduces the viscosity and fluidity and loses the printing performance, while the stationary ink causes deinking on the ink fountain.
(4) The ink contains too little oil, too much fines, and does not transfer pigment particles well and stays in the ink fountain to form deinking.
(5) The ink dries too fast, which causes the ink fountain shaft to dry and solidify, loses ink transmission performance, and blocks the gap between the ink fountain roller and the blade to form deinking.
(6) Too much impurities such as ink, residue, etc. in the ink block the gap between the ink fountain and the blade, affecting the formation of deinking under the ink.
(7) The water bucket syrup is too acidic or the gum arabic ink is too much ink.
(8) The layout is too watery. (To be continued)
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