Zinc plate making process

1. Corrosion operation process
    After the printed zinc plate is repaired, first use a 3Be°dilute nitric acid solution to remove the surface oxide film so that the graphic on the layout reveals a clear and bright zinc quality.  The layout can be cleaned up and should not be too heavy to prevent the micro graphic parts from being corroded and contracted or even corroded.  After cleaning the film, clean the layout with water and apply a layer of anti-pitting liquid to get on the machine.
    2. Corrosion solution preparation and condition setting
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    The formulation of the corrosive solution: the range of nitric acid is 8-11Be° (that is, the content is 10.2-14.5%), and the amount of imported additives is 400ml -500ml (taking a 40-liter machine as an example).
    Condition setting: temperature is 22-25℃, the number of revolutions is slightly higher, 300-400 revolutions, and the time is generally 8-12 minutes.
    Three, common fault diagnosis
    1. Pull the side wall:
    (1) The edges of the pictures and texts are smooth, bright, steep, and excessive additives.
    (2) The edges of the pictures and texts are hairy, dark, and the corners of the layout are cut, which means that there are too few additives.
    (3) The edges of the pictures and texts are hairy and cut inside, and the layout is gray, which is a serious lack of acid.
    (4) The whole page is pulled in, which is low temperature, fast speed, and few additives.
    2. The slope is too big and the gap between small characters is shallow:
    (1) The liquid level is high (normal leaf draft is 10-15mm).
    (2) The temperature is high.
    (3) Low number of revolutions.
    (4) There are many additives.
    3. Layout hemp
    (1) The corrosive liquid is too old and lacks acid.
    (2) The corrosive solution is not fully emulsified due to excessive additives or short mixing time.
    (3) The temperature is too high.
    (4) The number of revolutions is too low.
    (5) The baking temperature is too high, and the zinc plate crystallites are destroyed.
    4. Pockmarks on the layout
    (1) The layout is not clean.
    (2) The mixing time of the adding agent and the acid is not even, and the mixing time is short (15 minutes or more).
    (3) The action of the previous version is too slow, the downtime is long or the anti-pitting fluid fails.
    (4) There are impurities in the machine.
    (5) If the amount of acid is too small, and the temperature is too low, small needle-like pits will appear.
    (6) The quality of the zinc plate is not good, and the quality of the acid is not good.
    (7) The baking temperature is too high.
   
    The chemical formula of nitric acid: HNO3

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