The supervision and spot checks are based on QB/T 2624-2012 "sheetfed offset printing inks" and well-established corporate standards for color, tinctorial strength, fineness, fluidity, conjunctival drying, flow values, and soluble elements (barium and arsenic). , Strontium, cadmium, lead, chromium, mercury, selenium), (total content of lead, mercury, cadmium, hexavalent chromium) and other items were examined.
Product purchase and use tips
Ink product purchase:
In general, when choosing the printing ink, it is necessary to comprehensively consider the types of printing materials, printing methods and printing conditions, customer's special requirements, post-press processing technology, use and usage conditions, cost, and other factors. The types and types of inks are numerous. Choosing good inks and auxiliaries is the prerequisite and guarantee for excellent printing quality. Choosing the inks and auxiliaries that match well with the printed products can not only improve the grade and quality of the products, but also make up for the shortcomings of the pre-decoration. However, how do you choose inks and additives without professional testing conditions? Here are some simple ways to purchase.
Akira: Lift the ink bucket and shake it. If there is a crackling sound, the dilution is too severe and the viscosity is too low.
Counting: Consult the merchant about the number of printing passes and printing area of ​​the ink, the amount of calculation and the cost per square meter of material, not to be deceived by the unit price of the barrel. The ink consists of solids (film formers) and volatiles. The solid content is as high as 60% and low as less than 20%. The low unit price tends to consume a large amount of money, which is more expensive and wasteful, and the quality is often poorer.
Selection: Products with good quality are often more professional and have different designs and strict process requirements depending on the material, color, structure, or object of the substrate. Moreover, reputable manufacturers provide technical guidance and after-sales service.
Look: See if there is delamination or agglomeration in ink for no more than one year.
Smell: The ink in the barrel has been unsealed. If there is pungent odor, or if the smell is particularly washed out, there must be a problem. The smell of good ink is not too great.
Stirring: Stir the ink with a stir bar to see if there is a block. The good ink is not thick or agitate. The stir bar can also be pulled up to check the viscosity of the ink.
Touch: Fingers rub some ink, use your fingers to look fine or not, if many small particles, ink quality is not good. There is a clear difference between titanium dioxide and whitening powder after hand rubbing.
Inspection: Check the brand, date of manufacture, manufacturer, and place of production of the ink to see if there is no product. Do not be too superstitious about imported products.
Use common sense:
(1) In any case, the temperature of the ink must be kept below 20-25°C, and the temperature change can not be too large, otherwise it will affect the viscosity and screen printing quality and effect of the ink. Especially when the ink is stored outdoors or stored at different temperatures, it must be stored at ambient temperature for a few days or used in the ink drum before use.
(2) The ink must be fully and carefully mixed evenly by hand or mechanically before use. If ink gets into the air, leave it for a while. If you need to dilute, first mix thoroughly and then measure its viscosity. The ink tank must be sealed immediately after use. At the same time, never put the ink on the screen back into the ink tank and mix it with the unused ink.
(3) It is best to use a compatible cleaning agent to clean the net, and clean the net thoroughly. When cleaning, it is best to use a clean solvent.
(4) When the ink is dried, it must have a device with a good exhaust system.
(5) Screen printing operations should be carried out at the job site where the operating conditions meet the technical requirements.
2014 Guangzhou Ink Products Quality Supervision, Spot Check, Qualified Products and List of Enterprises
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