Guangzhou Municipal Bureau of Quality Supervision

2022-09-19
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Guangzhou Municipal Bureau of Quality Supervision announced the results of 2015 ink product quality supervision and spot check

Guangzhou Municipal Bureau of Quality Supervision announced the results of 2015 ink product quality supervision and spot check. The fruit was introduced into the test sample by using the wind path switching method

September 17, 2015

[China paint information] on September 16, 2015, Guangzhou Municipal Bureau of quality and Technical Supervision announced the results of 2015 Guangzhou ink product quality supervision and spot check in its official, and a total of 4 batches of products produced by 4 enterprises were spot checked, After inspection, they all meet the standard requirements

this spot check is based on the national standards qb/t sheet fed offset printing ink, qb/t intaglio plastic film surface printing ink, qb/t offset bright ink and the enterprise standards that have been put on record and are effective. The color, tinting power, fineness, fluidity, conjunctival drying, flow value, soluble elements (antimony, arsenic, barium, cadmium, lead, chromium, mercury, selenium), (total content of lead, mercury, cadmium, hexavalent chromium) and other items are tested

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list of qualified products and their enterprises in the quality supervision and spot check of Guangzhou ink products in 2015

1. Selection of ink products

when selecting printing ink, we should comprehensively consider the types of printing materials, printing methods and printing conditions, special requirements of customers, post press processing technology, use and use conditions, cost and other factors. There are many kinds and models of inks. Choosing good inks and additives is the premise and guarantee of good printing quality. Choosing ink and additives that match the printed products well can not only improve the grade and quality of products, but also make up for the shortcomings of early decoration. Without professional testing, consumers choose inks and additives in the following ways:

shake: lift the ink bucket and shake it. If there is a murmuring sound, it indicates that the dilution is seriously excessive and the viscosity is too low

calculation: consult the merchant about the printing times and printing area of ink, and calculate the consumption and material cost per square meter

selection: products with good quality are often more professional, and there are different designs and strict process requirements according to the material, color, structure or object of use of the substrate. Moreover, reputable manufacturers provide technical guidance and after-sales service

look: see whether the ink will be layered or caked in less than 1 year. If the solid matter in the ink sinks and forms a layer of liquid above 1/8 of the upper layer, it is colorless or yellowish, clear and clean, and there is no or less "made in China" graphene fiber, which has attracted the attention of the industry. There are floating debris, indicating that the ink is of good quality. Wipe a little on the transparent glass or plastic plate, and observe the distribution of pigments and synthetic resins under the light. It is good if there is no significant abnormality in one color

smell: if the barrel of opened ink has a pungent smell, or the smell is particularly strong, there must be a problem. The smell of good ink is not too strong

stirring: stir the ink with a stirring stick to see if there are lumps. Good ink is thick and does not agglomerate or cannot be stirred. You can also pull up the stirring stick to test the viscosity of the ink

touch: dip your finger in some ink and twist it gently with your finger to see whether it is fine or not. If there are many small particles, the ink quality is poor. Titanium dioxide is obviously different from whitening powder after being rubbed by hand on the whole

inspection: check the brand, date of manufacture, manufacturer and place of origin of the ink to see if there are no products

2. Use common sense

when using ink, you should pay attention to the following:

(1) in any case, the temperature of the ink must be kept below 20-25 ℃, and the temperature change should not be too large, otherwise it will affect the viscosity, printing quality and effect of the ink. Especially when the ink is stored outdoors or at different temperatures, it must be placed under the ambient temperature for a few days before reuse, or the ink barrel must reach the appropriate use temperature. This is because the use of cold ink will cause printing failure, causing unnecessary trouble. Therefore, to maintain the quality of the ink, it is best to store it under the process conditions of normal temperature

(2) the ink must be fully and carefully stirred manually or mechanically before use. If air enters the ink, let it stand for a period of time. If it is necessary to dilute, first mix it sufficiently, and then test its viscosity. The ink bucket must be sealed immediately after use. At the same time, never put the ink on the plate back into the ink bucket and mix it with unused ink

(3) it is best to use mutually suitable cleaning agents for cleaning, and it should be very thorough and clean. When cleaning again, it is best to use clean solvent

(4) when the ink is dried, it must have a device with a good exhaust system

(5) keep the operation conditions in line with the process and technical requirements. 1. Jinan gold assay sampling method industry site for printing operation

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