Discussion on the performance of the ink used in t

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Discussion on the performance of printing ink used for milk packaging film. Milk packaging film is usually printed by surface printing. In addition to the general technical requirements of surface printing ink (such as hue, fineness, viscosity, dryness, etc.), Due to the ultra-high temperature instantaneous sterilization during the automatic filling process (UL), the researchers developed other aliphatic 2 isocyanates [such as 1tra nbsp; temperaturesterialization, referred to as UHT for short) And hydrogen peroxide sterilization. Therefore, this special sterilization condition puts forward special requirements for ink performance. Here, the following aspects of performance need to be emphasized:

1 It has strong adhesion to polyethylene film. As the surface of the plastic film is smooth and the ink cannot penetrate on the surface, it is required that the adhesion between the ink and the plastic film is very strong, that is to say, the ink used for printing the milk packaging film should have high affinity and adhesion to the substrate material polyethylene film, with strong adhesion and good printing fastness, which is the prerequisite for ensuring high-quality printed matter and good printing effect

2. Strong wear resistance and scratch resistance. As the surface printing ink is printed on the outer surface of the film, it will be subject to friction in the process of commodity circulation, which requires that the printing ink used must have strong wear resistance and scratch resistance. After printing, the ink film has high surface strength, good firmness and friction resistance. Otherwise, the ink layer will fall off, resulting in incomplete printing patterns and affecting the product appearance and quality

3. Excellent water resistance. During the process of ultra-high temperature instantaneous sterilization (140 ℃/1 ~ 3 seconds) and hydrogen peroxide sterilization, the surface of milk packaging film will contact with water or steam. Therefore, the printing ink used must have excellent water resistance and will not fade in case of water

4. Excellent heat resistance and freezing resistance. The printing ink used for milk packaging film must have certain heat resistance to ensure that the ink will not soften, become sticky, and the imprint will fade or change color after ultra-high temperature sterilization. In addition, the milk after filling generally needs to be refrigerated at low temperature in the links of storage, circulation and sales. Therefore, the printing ink used must have good freeze resistance, and the ink layer will not freeze and fall off at low temperature

5. Outstanding oxidation resistance. Most high-speed filling machines are equipped with hot hydrogen peroxide to kill bacteria. We are very proud to be their material and service supplier bacteria system to sterilize the packaging film. Hydrogen peroxide has strong oxidizability. Some emerging industries have put forward new requirements for experimental fixtures. Their oxidizability increases significantly with the increase of temperature, which puts forward higher requirements for the oxidation resistance of printing inks. If the oxidation resistance of pigments in the ink is not very good, ink fading will occur, affecting the product quality

source: printing industry channel

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