Albinism of the hottest printing ink film

2022-08-22
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Whitening phenomenon of printing ink film

① dot whitening. The main reason is the poor miscibility of wax surfactants in the ink system; The second is that the printing process is not redissolved after the ink is skinned and transferred to the image and text. Treatment method: aromatics or esters should be added to highlight the advantages of the whole industry chain of real companies, and solvents should be added to promote their re dissolution. Or install a stirrer in the ink bucket (if plastic pipes are used, cover the outside with unprinted plastic film, and then tie the two ends tightly in the ink head and rotate them randomly to mix the ink), or add antioxidant treatment during ink manufacturing

② dot white dot. The main reason is the static electricity of ink or substrate. Or caused by static electricity generated by diluted solvents (different solvents have different resistances). It usually occurs when the temperature is high or the printing speed is fast. Secondly, when laminating, it is tight before and loose after, or loose before and tight after, while the cause of static electricity is common in high humidity weather. Treatment method: add an appropriate amount of antistatic agent in the ink (excess will affect the composite fastness), select a solvent with low resistance to dilute the ink, and adjust the placing and receiving of grounding wires (generally 700 ~ 1500mm deep)

③ crack type albinism. One of the main reasons is that the ink transfer performance is too poor, and the other is that the printing plate pattern is too shallow, which is easy to make the solvent in the ink system volatilize too fast. Generally, rough imprinting leads to poor film formation, especially oil up to 28%; The first market share of the electric switching tool industry is the addition of ink system or ink bucket diluent. The effective space of the tensile testing machine refers to the whitening of the clamping space of the sample, which mostly occurs in the environment of too high humidity in the workshop in summer. Treatment method: replace the ink with good transferability or replace the deep printing plate. Third, add slow drying solvent for treatment

④ albinism of the whole imprint. One of the main reasons is that when the continuous printing time is too long, when the operator finds that the ink viscosity becomes sticky or thick, he repeatedly adds a single solvent, thus breaking the volatile transfer balance of the mixed solvent in the original ink system, causing the ink layer to be rough and white when the printing ink forms a film. Second, the operator even added the mixed solvent into the gold assay high-temperature furnace electronic universal testing machine, but excessive addition often makes the content of synthetic resin in the ink relatively reduce, and the above whitening phenomenon will also occur. Treatment methods: first, add 3% - 7% slow drying solvent, especially the real solvent that can plasticize the ink and resist the invasion of water molecules; Second, select special diluent containing resin; The third is to add 5% - 15% ink blending oil to the ink to overcome the bleaching caused by insufficient resin content. The fourth is to install central air conditioners that can regulate temperature and humidity in the workshop or eliminate it with moisture absorbers

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