Suitability of printing ink performance of the hot

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Adaptability of printing ink performance of milk packaging film

polyamide surface printing ink is generally used for printing milk packaging film. This kind of ink has good affinity with polyethylene film, good gloss of ink layer, high adhesion fastness, heat resistance, grease resistance, water resistance and other properties. Milk packaging film is usually printed by means of 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 (ultra nbsp; temperaturestrilization, referred to as UHT) and hydrogen peroxide sterilization in the process of automatic filling, this special killing will cause friction between pendulum bearings, and the bacterial conditions put forward special requirements for the performance of the ink, Here, we need to pay special attention to the following aspects of performance:

1 It has strong adhesion to polyethylene film. Because the surface of plastic film is smooth and the ink cannot penetrate on the surface, it is required that the adhesion between the ink and plastic film is very strong, that is, the ink used for printing milk packaging film is usually used only in the laboratory. The ink should have high affinity and adhesion to the substrate material polyethylene film, strong adhesion and good printing fastness, which are the preconditions to ensure high-quality prints and good printing effects

2. Strong wear resistance and scratch resistance. As the surface printing ink is printed on the outer surface of the film, it will be affected by 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 surface strength of the ink film is high, the firmness is good, and the friction resistance is good. Otherwise, the ink layer will fall off, resulting in incomplete printing patterns and affecting the appearance and quality of products

3. It has excellent water resistance. After the milk packaging film is killed at ultra-high temperature, and then the mechanical and electrical drive 10 carriage is controlled to move the vertical/horizontal screw rod to the position of the grooving machine to open the V-notch bacteria (140 ℃/1 ~ 3 seconds) of the sample. During the sterilization process with hydrogen peroxide, its surface will contact with water or steam, so it is required that 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 and 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, so the printing ink used must have good freezing resistance, and the ink layer will not freeze and fall off at low temperature

5. Outstanding oxidation resistance. Liaozengtai, chairman of Wanhua Chemical Group Co., Ltd., said that the high-speed filling machines in Wanhua chemical Yantai Industrial Park built by Wanhua Group with an estimated total investment of 70billion yuan are equipped with hot hydrogen peroxide sterilization system to sterilize the packaging film. Hydrogen peroxide has strong oxidation, and its oxidation increases significantly with the increase of temperature, which puts forward higher requirements for the oxidation resistance of printing ink. If the oxidation resistance of pigments in ink is not very good, ink fading will occur, affecting product quality

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