Composite membrane solvent residual, who are at work?

In the process of composite film of printing, is we often need to come into contact with the solvent. Solvent for printing provides a convenient, but really that big solvent residue. Below took everybody simple know about the influence of the seven factors of solvent evaporation. 1, the influence of the boiling point of solvent volatility generally with the boiling point of 60 ~ 150 ℃ solvents can be used in the gravure printing ink. Is generally the lower the boiling point solvent, the faster the volatile. But there are exceptions, such as ethyl acetate and ethanol in the boiling point, the volatilization rate of ethyl acetate almost twice is ethanol, therefore in the plastic gravure printing ink printing speed, ethyl acetate is commonly used to replace ethanol. Summer high temperature, solvent evaporation fast, low price of ethanol, and often replace ethyl acetate with ethanol. Influence on the release of 2, resin ink solvent evaporation in the situation is more complicated, when resin dissolved in solvent, both of the substances molecules are connected with each other at this point, the evaporation of the solvent speed at a lower rate than the evaporation of the solvent itself. Certain liquid ink viscosity, adhesion in the drying process of solvent volatilization, resin content on the rise, solvent volatilization speed is slow. Especially the polar alcohols solvents have larger, polyamide resin with polarity attraction, especially in the boiling point slightly higher alcohols, is not easy to volatilize, increase the amount of residual solvents in the ink film, pollution packing materials, so choose the ink, should try to use the ink solvent release better resin. 3, the influence of the mixed solvent of plastic gravure ink generally adopts the mixed solvent, mixed solvent volatilization rate is not only related to the boiling point of the solvent itself, and interaction between the solvent molecules, volatile speed is not the mixed solvent volatilization of average, must consider when choosing solvent two opposite: should not only satisfied with the printing requirements, and to ensure the stock of solvent residue as small as possible. 4 the influence of temperature and air flow in the drying oven, drying oven temperature the faster, the faster the solvent evaporation, but temperature is too high, easy cause printing membrane stretched, therefore, to the level of printing the average set temperature to 45 ~ 65 ℃; For large area printing temperature control in commonly 75 ~ 90 ℃. Drying oven into wind pressure and wind pressure is not the bigger the better, but to be into the air and exhaust air volume balance, if the exhaust air volume is too big, can lead to broken membrane or scratch the ink layer, general oven into wind pressure for 80 ~ 90 h2 & shy; O, exhaust pressure of 40 ~ 50 H2 & shy; O。 5, the influence of printing speed, the faster the printing speed, print after drying oven of the shorter the time, the ink drying is adverse, appropriate to reduce the speed is also one way to solve the residual solvents. 6, the influence of environment temperature is higher, the faster the solvent evaporation, the faster the air flows in workshop, the faster the solvent evaporation, conversely the more slowly. 7, the condition of pigment particles of ink when, when add pigment, filler material, such as solvent volatilization rate is greatly reduced. Pigment particles of the thinner, the larger the surface area, evaporation of the solvent is slow. Changzhou food packaging material manufacturer co. , LTD. Is a professional production and sales of composite membrane, composite bag manufacturers. The company always adheres to the & other; Quality first, customer supreme, quality service, abides by the contract & throughout; Tenet, with high quality products, good reputation, high quality service, the products sell well in nearly more than 30 provinces and cities nationwide, exported to southeast Asia, Europe and the United States and other countries.
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