Copper-zinc plate corrosion hot stamping production technology

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Copper-zinc plate corrosion machine hot stamping production technology

Bronzing corrosion machine use

Learn to bronzing version of the copper version of the zinc plate to make a full set of technical copper plate making process film, printing, revision and zinc plate the same, but the back of the copper plate should be coated with anti-corrosion protection paint or paste transparent tape.
First, the preparation of corrosive liquid
1. Preparation of stock solution: Pre-dissolve the ferric chloride in water three days ago, stir it thoroughly to make it fully hydrolyzed, and then adjust it to 27-30° with water.
2. Old liquid storage: The used old liquid can be mixed with the new liquid when the copper content does not exceed 2000g or the additive content does not exceed 100g (refers to the cumulative amount of formazan disulfide). According to the amount of plate making or the estimated amount of copper dissolved on the day, the ratio of new and old liquids is 1:1 or 3:1.
Now take 40 liters as an example:
(1), 30 liters of new liquid, 10 liters of old liquid, 600-700 ml of additive, 500-600 ml of hydrochloric acid.
(2), 20 liters of new liquid, 20 liters of old liquid, 500-600 ml of additive, 300-500 ml of hydrochloric acid.
3. Additive preparation: The ratio of formazan disulfide to vinyl thiourea is about 2:1, and the amount of preparation should be determined according to the amount of plate making.
Now take 40 liters as an example:
(1) 60 g of formazan disulfide and 30-32 g of vinyl thiourea are dissolved by heating with 2000 ml of ferric chloride. The heating temperature is 60-70 °C.
(2) If the amount of plate making on the day is halved, it is 30 grams of formazan disulfide, 15-17 grams of vinyl thiourea, and dissolved by heating with 1 liter of ferric chloride.
Each time the dosing removes the first amount, the balance is added in the middle of the layout.
Second, the operation process
1. Preparation: use clean water to clean the corrosive machine, add new liquid, old liquid and hydrochloric acid according to the formula. After stirring for 5 minutes, add the additive and stir for 15 minutes. If the corrosive liquid has bubbles, add 3-5 drops of zinc additive. .
2. Condition setting: temperature 23-25 ​​°C, the number of revolutions starts to set 500-600 rpm, and then the layout state or plate requirements are gradually lowered.
3. Operation sequence:
(1), clean the plate with dilute ferric chloride, remove the plate oxide film, reveal the copper color, and find that the pitting is scraped off with a plate cutter.
(2) Finish the layout with the whole surface liquid (produced by the anti-pitting point).
Formula: 1000 ml of water, 300 g of salt, 100 ml of glacial acetic acid.
(3) After the whole surface, it can be corroded on the machine.
4, stop observation: first use 500-600 rpm corrosion for 3-5 minutes (depending on the thickness of the layout). You can stop to observe the state of the plate. If the corrosive liquid is normal, you can reduce the number of revolutions (450-500 rpm). After corrosion for about 10 minutes, stop and observe the plate state and slope. It is determined according to the slope condition to increase or decrease the number of revolutions. Wait again for 15-20 minutes. If the layout is normal, it can be etched to the required depth (45-50 minutes for general time).
5. Observe the processing of the layout status:
(1) The plate has a small amount of floc flowing smoothly indicating that the corrosive liquid is normal.
(2) The whitish layout (slightly lustrous) indicates that the additive is insufficient, the acidity is large, the slope will be delayed, and the small characters will be corroded. The additive should be added to reduce the number of revolutions.
(3) The layout has a very thick black floc. The slow flow indicates that the additive is too much, and the strength of the corrosive liquid is too small. Hydrochloric acid and ferric chloride can be added to increase the number of revolutions or temperature, otherwise a large amount of pitting and hemp tablets will be produced.
(4) If the etching solution of the plate is normal after 20 minutes, it can be corroded to a certain depth, but in order to maintain a good slope, the number of revolutions can be appropriately reduced (generally not less than 300 rpm).
6, quality requirements:
(1) The layout is complete and meets the requirements of the film.
(2) The slope of the layout is smooth and clean, without pitting.
(3) The angle of the slope is 110-120°.
(4) The depth is 0.6mm or more.
(5) The gap between words meets the requirements of hot stamping.
7. Post-corrosion treatment: The prepared copper plate is rinsed with water, and then the gap deposits are removed with nitric acid or brine.
※Anti-corrosion protection paint on the back: Available (paint film) shellac alcohol solution (ie: paint sheet 50g alcohol 500ml) brush with brush, can also use nitro paint (released with diluted water) or anti-rust paint And so on.

Copper-zinc plate etching hot stamping plate making technology is one-on-one hand-made design from black and white manuscript ~ black and white manuscript or film copy (turning film) ~ glued ~ drying version ~ revision version ~ corrosion hot stamping version ~ embossed version processing ~ refractive embossed version ~ Learning resin version, refraction embossing, bronzing version, embossed version, copper plate, zinc plate ~ full version ~ packaging... hot stamping version of the full set of technology, let you know how to personally operate, next to the technical staff, 15 days to January Within, let yourself meet the market requirements for your local hot stamping quality standards.
Zinc plate making process 1. After the zinc plate has been modified by the etching process, the surface oxide film is removed by the 3Be° dilute nitric acid solution to make the layout image clear and bright. The layout can be opened, and it should not be too heavy to prevent the micro-texture from being corroded and shrinking or even corroded. After clearing the film, wash the plate with water and apply a layer of anti-pitting liquid to get on the machine.
The anti-hemp solution is 25Be of gum arabic or sodium nitrate 100g, sulfuric acid 200ml, water 500ml (add water to 10Be° when used).
Second, the preparation of corrosive liquid and conditions set the formulation of the etching solution: nitric acid range of 8 -11.5Be ° (that is, the content is 10.2 - 14.5%), the amount of domestic additives is slightly more than 700-1000ml, and the amount of additives in the United States, Japan and other countries Less 550-600ml.
According to the US additive specification: the nitrate is 11-11.5% (8-9Be) additive is 2.8-3% (ie 1100-1200ml). The temperature was 28 ° C and was spray etched. In China, it is agitated corrosion. The use of imported additives should be adjusted to the corrosive ratio and operating conditions to suit the production conditions of the plant.
Domestic use of imported additives generally take half the amount of 550-600ml formula to improve the temperature does not enhance the slope protection (28-30 ° C), reduce the number of revolutions 250-300 rpm to solve the slope protection problem, in order to save raw materials and plate making The problem of inconsistency.
The amount of domestic additives is much higher, the temperature is slightly lower than 22-25 °C, and the number of revolutions is slightly higher than 290-350 rpm. The time is usually 15-17 minutes. The depth is 0.6mm and the slope angle is 110-120°.
Third, common fault diagnosis
1. Side wall 抠:
(1) The edges of the picture are smooth, bright, large, and the corners of the layout are too large.
(2) The edges of the picture are hairy, gray, small, and the corners of the layout are too low.
(3) The edges of the picture are hairy and creased, and the layout is gray, which is severely deficient in acid.
(4) In the full version, there is less corrosion and less acid than time.
(5) There are few additives in the side wall.
(6) The high number of revolutions and low temperatures can also cause internal convulsions.
2, the slope is too large, the small gap is shallow:
(1) High liquid level (normal blade draft 10-15mm).
(2) The temperature is high.
(3) The number of revolutions is low.
(4) There are many additives.
3, the layout of the film (1) Corrosive liquid is too old, lack of acid.
(2) Excessive additives or short stirring time The etching solution is not sufficiently emulsified.
(3) The temperature is too high.
(4) The number of revolutions is too low.
(5) The baking plate temperature is too high and the zinc plate crystallites are destroyed.
4, layout pitting (1) layout is not clean.
(2) The mixing agent and the acid solution are not mixed uniformly, and the stirring time is short (15 points or more).
(3) The upper version is too slow, the downtime is long or the anti-pitting liquid is invalid.
(4) There are impurities in the machine.
(5) If the amount of acid is too small, the small needle-like pockmark group will appear when the temperature is too low.
(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.

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Hot stamping version of copper plate zinc plate production full set of technology

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