Analysis: Packaging Printing Inks, Crust Hazards And Prevention - Printing, Packaging, Ink -

1, Packaging Printing After the ink crusts measures we all know

, when

Print The ink fountain in the process of drying due to the formation of a level surface membrane, either the placing of a stirring device, or altogether discard the ink, otherwise, will be attached to a film roll, the results will form a rugged layout, printed materials leading to the pollution of knife marks appear chaotic. The reason for the ink industry tend to:

(1) ink drying too fast; (2) ink poor mobility; (3) precipitation of ink has dried. But I wonder if this phenomenon is the result of mature ink system, volatilization, or evaporation or oxidation caused by dry large gradient, while the printing industry is that: the ink well ink barrel or fountain structure, produce does not stay the flow of parts from the dry machine leakage of air drying of the ink's surface or a hot hair blowing in the ink fountain caused.

Although Amid different, but around this phenomenon, the printing operator commonly used approach is to:

(1) can not use fast drying ink;

(2) Add in the slow dry solvent;

(3) replacement of deteriorated ink (from poor mobility to the mobility of the fine);

(4), keep running in the fountain stirred;

(5) Set in a fountain on the roof closed;

(6) adjust the angle hot hair. General common sense have experience in printing, speed too fast when dry, or too light ink concentration, or mobile bad, or ink thixotropy large, or when the electrostatic ink, printing machinery will be taken to speed fast way to transfer both to prevent the ink dry and at the plate early on, but also overcome

Package Printing ink film formed crust, remove the graphic stripes failure.

2, stable packaging printing ink to control the film quality graphics packaging and printing ink ink film of radical polymerization, drying or solvent evaporation, and the role of oxidative activity, we can achieve the purpose to prevent the crust. However, this control action must be based on needs, without affecting the drying rate of printed graphic film, and do not affect the performance and quality ink products, which is the minimum standard ink manufacturing.

To achieve this, I recommend the following three methods:

Method 1: Add antioxidant and retarder. In the printing ink system, adding the role of antioxidants or retarder is to prevent the process of packaging and printing graphic film free radicals, so as to achieve interruption of ink film oxidation, volatile polymerization. Once in a very short time, volatile solvents, oils, also will reduce the oxidation process, the ink will continue to produce the free radical polymer film (such as Tianjin, Lik Sang

Chemical industry Plant Products). Method 2: adding oxygen barrier agent. Use of agents known as liquid paraffin and oxygen added to the packaging and printing inks, the resulting vapor fills the ink barrels, cans, boxes between, so as to form a layer of oxygen barrier (membrane), thereby effectively prevent vapor pressure due to The highly volatile solvent out in ink system.

Method three: join the complexing agent. Use of oxime compounds (methyl ethyl ketone oxime, butyraldehyde oxime, acetophenone oxime ring hydroquinone, etc.) control the ink system, the activity of driers, delay or prevent the crust played a role. For a long time, packaging and printing inks to add anti-skinning agent (ie, inhibition), has 50 years of history, nearly four years, mostly with phenols, which are used in the ink in acid, high boiling point compared to the first selection solvent covered surface both save time and also effort. Because phenolic compounds itself is a proton donor, the oxidation process can produce free radicals in the reaction of ROOH, while the formation of a stable oxygen free radical, capture activity of free radicals, the termination of the oxidative polymerization of the reaction - to prevent the printing ink crust. With the development of science and technology in recent years people have used ink oxime compounds as anti-skinning agent, butyraldehyde and methyl ethyl ketone oxime was found to prevent the ink on the best crust. Some packaging and printing ink manufacturers and operators that oxime compounds have anti-gel effect than the traditional phenolic compounds. 80 years of the 20th century, China's first successful development of anti-skinning agents MEKO, following the advent of butyraldehyde oxime, application and effect of our country to reach the world advanced level.

3, anti-skinning agent application and precautions packaging printing inks, especially the oxidation of solvent evaporation rate, the modified resin oils, paints, fillers, driers amount, ink product storage conditions temperature, humidity and other factors on the ink crusts (gel) has some effect, so the use of anti-skinning agent (gel), you must take into account all these factors, but also should focus on adding content basic information in seven areas:

1, the amount added. Generally calculated by ink material (the main ingredients for crust is the main raw material for ink), or by calculating the total packaging printing inks, while also taking into account the effect by other components. Usually added 0.1% to 0.3% and on it. Because all the year round temperature and humidity differences, the speed of its crust has some differences. Therefore, 0.1% in winter, summer 0.3%, 0.2% in spring and autumn. As the formula of the group were then determined is scientific.

2, the rate of dry ink film. Whether oxidation or evaporation rate at room temperature or evaporation rate, we have proven in practice: in the manufacture of alkyd resins

Offset printing ink In methyl ethyl ketone oxime dosage is generally 1%, while dry-speed longer, but it is still packaging and printing requirements of the standards. This is because the chemicals and driers in the Complex, so that dryer caused a temporary loss of activity, so that phenolic compounds used to capture the traditional radical polymerization termination principle different, due to oxime compounds little effect on the drying rate, if the amount of excess, volatile time extended, complex disintegrated too slowly, and often affect the drying rate of packaging film printing ink.

3, yellowing. Anti-skinning agents, once more than 0.3%, often graphic printing ink film will lead to yellowing, especially in the use of white ink, yellowed by the prolonged storage will have problems. Therefore, strict control of dosage or change butyraldehyde oxime yellowing of fault can be avoided.

4. Color degrees. Packaging and printing inks in Canada to prevent the crust agent, often directly affect the degree of ink color, ink transfer is usually affected more than oil color ink, white or deep yellow color ink affect more than packaging and printing inks. Generally rely on visual observation of this phenomenon is difficult to observe, and has nothing to do with the added volume. Although we are aware of packaging and printing graphic film after drying of the ink film applied hue is not affected, but in some pigments (such as gender pigments) and the presence of drier, the packaging film printing ink color graphics color will appear between the significant difference, had trouble on the palette.

by: gaga

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