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Before flexible packaging printing, the types and usage of water-based ink additives

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2020-10-28

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1. PH value stabilizer. The pH stabilizer can supplement ammonia and water volatilized from the ink transfer system during the printing process, help to stabilize the ink viscosity and ensure the printing quality. According to the different substrate, pH stabilizers are divided into ordinary type and film type. When printing fine screen wire, special pH stabilizer shall be used. The general usage of pH stabilizer is to add 1% - 2% of the total ink amount every 30-40 minutes and stir evenly, or add the stabilizer to the circulating ink pump.
2. Defoamer. Generally, an appropriate amount of defoamer is added to the ink before printing to prevent the ink from forming foam. When necessary, an appropriate amount of defoamer can also be added during printing. The amount of defoamer shall not exceed 0.5%~1% of the total ink amount each time.
3. Fast drying and slow drying agent. Fast drying agent and slow drying agent can be added to the ink according to the actual printing speed of the printing machine, and the drying speed of water-based ink can be appropriately changed to obtain a satisfactory printing effect. Its dosage is 1% - 2% of the total ink quantity.
4. Remove the diluent. On the premise that the pH value and viscosity remain unchanged, the color concentration of a certain ink can be reduced by adding a light remover. The dosage shall be determined according to the specific situation.
5. Thinner. Adding thinner to the ink can reduce the viscosity of thickened water-based ink without affecting the pH value. Its amount must not exceed 5% of the total ink amount.
6. Reinforcing agent. Enhancer can enhance the adhesion of printing ink or varnish to the substrate, and its amount is generally 1% - 2% of the total ink amount.
7. Antistatic agent. The antistatic agent can effectively prevent the accumulation of static electricity on the printing press, and its amount is generally 0.5%~1% of the total ink amount.

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