The problem of reverse bonding of cross linked film
Anti sticky phenomenon 1: the temperature resistance and formula of the ink itself, which will cause this situation to occur under certain pressure, adding temperature to or exceeding the limit of temperature resistance of ink resin. The phenomenon of anti sticky and decolorization will appear in the storage of printing products too high, especially in the rainy season. Production enterprises should strengthen the ventilation of transportation and warehouses and avoid high temperature phenomena. Secondly, the ink suppliers can be improved. Ink suppliers can be adjusted according to the printing equipment.
Anti sticky phenomenon two: it appears after the printing is collected. When carrying out second processes, such as bagging or slitting, the phenomenon of anti sticking is found. This kind of anti sticking is basically more serious.
Cause of anti sticky
1. The tension is too tight when the volume is reel.
2, ink drying is not complete.
3, mixed solvents are not pure, especially ethyl ester, ethanol and so on.
4, solvent ratio is not suitable for printing machine speed and drying temperature.
5, printing drying equipment temperature control instability or exhaust air does not match.
6. The design of printed page.
7. The placement of the products after printing.
Resolvent
1, the workshop should adjust the appropriate tension of the winding according to different printing materials and record the relevant data. The best tension of the following machine is suitable for soft and hard medium with hand pressure. In particular, transparent ink should not be pressed with roller.
2, choose a good drying ink, pay attention to communicate with ink suppliers, product structure and requirements for printing ink. If there are excess color groups, the printing film can be more than a few, with cold wind to deal with.
3, each batch should check the purity of solvents, and make specific requirements for solvent suppliers. The storage and extraction of solvents should not be carried out in humid areas. Ventilated cool storage area is the best storage location.
4, the ratio of solvent should pay attention to its solubility and evaporation speed, and pay attention to matching with the resin type of the ink itself. Pay attention to the viscosity of the ink, the thickness of the ink layer has some effect on anti adhesion.
5, pay attention to check whether the drying temperature of printing equipment is normal and stable, especially pay attention to whether the air volume of intake and exhaust is matched.
6, the layout design should pay attention to ink lines best not to overprint, followed by metal ink drying and ink viscosity control.
7, do not place horizontal products after placing printed products. They can be placed in a hanging or vertical way.
8. The color of the packing bag on the surface of the packing bag, which is stacked or packed, transferred to the back of another bag (printed or non printed), which only occurs in purple or very few colors. This is usually related to the storage environment and the performance of the ink itself.
The main reason for it is color penetration, that is to say, when the ink is printed with this color, the imprint is quickly penetrated at a certain time, under pressure, or in other special cases, such as the PE bag (printed with printing ink).
In these products, the shrinkable film (crosslinked film) production enterprises should fully understand the packaging forms and requirements of the products, choose the appropriate ink for trial production, confirm the printing ink that conforms to the requirements of the product and then batch production, which can effectively reduce the appearance of the quality problems such as anti sticky and reduce the loss.
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