ã€Chinese Packaging Network News】 Anti-sticking phenomenon: the temperature resistance of the ink itself and the formulation of the resin problem, it makes the print under a certain pressure, plus the temperature reached or exceeded the limit of the temperature of the ink resin This situation will occur, in the warehouse stacking too high there will be anti-adhesion and bleaching phenomenon, especially in the rainy season often occur, flexible packaging companies to strengthen the ventilation of the transport and warehouse, try to avoid high temperatures. Secondly, we can propose improvements to ink suppliers. Ink suppliers can make adjustments based on printing equipment.
Anti-sticking phenomenon II: appeared after printing and winding. When the second process, such as compounding or bagging or slitting, is found to have anti-adhesion, this kind of anti-sticking is basically more serious, and some minor ones can be wiped clean by compounding.
Causes of anti-sticking
1, the tension is too tight when winding.
2, ink drying is not complete.
3, mixed solvents impure, especially ethyl, ethanol and so on.
4, the solvent ratio is not suitable for printing machine speed, drying temperature.
5. The temperature of the printing and drying equipment is not stable or there is a mismatch between the intake and exhaust air.
6, the design of the printing layout.
7, the placement of the product after printing.
Solution
1. The workshop should adjust the appropriate winding tension according to different printing materials and make relevant data records. The best tension for the next machine is hand soft, soft and hard. In particular, the clear ink should not be pressed with a take-up roller.
2. Select inks with good drying properties, pay attention to communication with ink suppliers, product structure of the company and requirements for ink. If there are more than one color group printing film can be more than a few, with cold air to deal with.
3, each batch to test the purity of the solvent, the specific requirements of the solvent suppliers. And the storage and extraction of solvents should be careful not to operate in wet areas. Ventilation cool storage area is the best storage location.
4, the solvent ratio should pay attention to its solubility, volatilization rate, pay attention to the type of resin with the ink itself to match. Pay attention to the viscosity of the ink, the thickness of the ink ink layer also has a certain impact on anti-sticking.
5, pay attention to check the printing equipment drying temperature is normal and stable, especially to pay attention to the amount of wind into the exhaust.
6, the layout of the design should pay attention to the ink line is best not to overprint, followed by attention to the drying of metal ink and ink viscosity control.
7, the printed product placement should not be stacked horizontally, you can choose to hang or vertical way to place.
8. The color of the bags on the surface of the bags that have been stacked or packed has been transferred to the back of another bag (with or without printing). This can occur only with purple or very few colors. This is usually related to the storage environment and the performance of the ink itself. The main reason for this is color penetration, that is, when the ink is printed using this color, the printed product is subjected to a certain amount of time, pressure, or other special conditions, such as a PE bag for packaging clothing (using a table printing ink In India) Infiltration will soon appear. In these products, flexible packaging companies must fully understand the packaging forms and requirements of good products, select suitable inks for trial production, and confirm that the inks meet the requirements of the products before mass production, which can effectively reduce the occurrence of anti-sticking and other quality problems, and reduce loss.