What should be eaten to prevent the harm of blending ink to the body

Printing inks are composed of pigments, binders, solvents, and auxiliaries. Among them, organic solvents and heavy metal elements are seriously harmful to the human body. There are two types of pigments in inks, inorganic and organic, both of which are insoluble in water and other media, and have bright color and stability.

Some inorganic pigments contain heavy metals such as lead, chromium, copper, mercury, etc., which are toxic and cannot be used in printed food packaging and children's toys. Some organic pigments contain biphenyl gum, which has carcinogenic ingredients and should be strictly prohibited. Organic solvents can dissolve many natural resins and synthetic resins, which are important components of various inks, but some of them will damage the human body and subcutaneous fat, and long-term contact will make **dry cracks, rough, if penetrated into ** or blood vessels, it will endanger human blood cells and hematopoietic function with blood; It is sucked into the trachea, bronchi, lungs, or transmitted to other organs through blood vessels and lymphatic vessels, and may even cause chronic poisoning of the body. Some inks have the problem of toxicity of heavy metal ions, and pigments and dyes contain carcinogenic ingredients, which are very harmful to human health.

Composite packaging materials use a large number of inks, organic solvents and adhesives in printing, although these excipients are not in direct contact with food, but in the process of food packaging and storage, some toxic substances will migrate into the food, endangering people's health. Organic solvents such as ethanol, isopropanol, butanol, propanol, butanone, ethyl acetate, butyl acetate, toluene, xylene, etc., are often used in printing inks. Although most of these solvents can be removed by drying, the residual solvents will migrate into the food and harm the human body.

The solvents used in gravure inks generally include butanone, xylene, toluene, butanol, etc. In particular, the residual smell of butanone is strong. Because the pigment particles in the ink are very small and the adsorption force is strong, although it has been heated and dried during printing, it is often not completely dried due to the short time and fast speed, especially the printed matter with a large inking area and a thicker ink layer, and its residual solvent is more.

These residual solvents are brought to the compounding process, where they are more difficult to escape after compounding and slowly migrate and penetrate, so solvent residues must be kept to a minimum.

First of all, you should take protective measures first, and you can eat more high-protein foods (protein-rich foods can be divided into legumes, mountain products, animal offal, meat, poultry, aquatic products, eggs, etc.), because protein can slow down the absorption of lead in ink by body tissues.

1. Characteristics of inks.

1 Viscosity and thixotropy.

In the manufacturing process of printed circuit boards, screen printing is one of the indispensable and important processes. In order to achieve the fidelity of image reproduction, the ink must have good tack and suitable thixotropy. The so-called viscosity is the internal friction of the liquid, which indicates the friction exerted by the inner layer of liquid under the action of external force, which makes one layer of liquid slide on another layer of liquid.

The inner layer of a thick liquid encounters greater mechanical resistance when sliding, and the thinner liquid has less resistance. The unit of viscosity determination is poise. In particular, it should be noted that temperature has a significant effect on viscosity.

Thixotropy is a physical property of a liquid, that is, its viscosity decreases in the stirring state, and then quickly returns to its original viscosity after standing. By agitation, the thixotropic effect lasts long enough to reconstitute its internal structure. In order to achieve high-quality screen printing results, the thixotropy of the ink is very important.

Especially in the scraping process, the ink is agitated and liquefied. This effect accelerates the speed at which the ink passes through the mesh, and promotes the ink that was originally separated by the mesh cable to be evenly connected. Once the squeegee stops moving, the ink returns to a stationary state and its viscosity quickly returns to the required data.

2 Fineness:

Pigments and mineral fillers are generally solid in nature, finely ground to a particle size of no more than 4 5 microns, and in solid form to form a homogeneous flow state. Therefore, it is very important to require the ink to be fine.

2. Precautions for the use of ink.

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 of the ink and the quality and effect of screen printing.

Especially when the ink is stored outdoors or at different temperatures, it must be placed at ambient temperature for a few days before reuse, or the ink barrel must reach a suitable operating temperature. This is because the use of cold ink can cause screen printing failures and cause unnecessary trouble. Therefore, to maintain the quality of the ink, it is best to store or store it at room temperature under process conditions.

2. The ink must be fully and carefully stirred by hand or mechanically before use. If air gets into the ink, let it sit for a while when using it. If dilution is required, it is first thoroughly mixed before its viscosity is tested.

The ink barrel must be sealed immediately after use. At the same time, never put the ink on the screen back into the ink barrel and mix it with the unused ink.

3 It is best to use a mutually adaptable cleaning agent for cleaning the net, and it should be very thorough and clean. It is best to use a clean solvent for further cleaning.

4. When drying the ink, it must be carried out in a device with a good exhaust system.

5. In order to maintain the operating conditions, the screen printing operation should be carried out in the operation site that meets the technical requirements of the process.

It depends on what type of ink you're using.

If it is a cheap solvent-based ink containing organic solvents such as benzene and ketone, such as low-end gravure ink, then the harm to the human body is indeed quite large, and long-term exposure to a certain concentration has a serious impact on the human nervous system, respiratory tract and fertility.

If it is an alcohol-soluble ink, it is better, but the ingredients such as isopropyl alcohol are still harmful, so it is recommended to cover the ink tank or wear a mask;

If it is a water-based ink with low VOC emissions, or a UV ink with almost no volatile substances, the harm is very low and can be basically ignored, but it is necessary to pay attention to accidents such as contact allergies or accidental contact with eyes, mouth and nose.

Your question is very difficult, printing ink is generally divided into three kinds according to percentages, water-based ink, solvent ink, ink, as the name suggests, the system of water-based ink is water, this kind of question is environmentally friendly, and the solution is xylene.

Isopropanol and the like are used as solvents, and the solvent generally used for inks is high boiling inner point kerosene. Obviously, the remaining two have a certain amount of harm.

Yes, as for how serious it is, it depends on my physical condition and the material of the ink, most of which are chronic poisoning. There is no resistance. If you get sick at every turn, if it is the last marriage, it will affect the brain, intelligence and physical resistance of the child in the future

I often come into contact with ink, I know, ink is very harmful to the body, as well as gasoline, etc., for the ink is divided into several kinds, under normal circumstances, there are yellow, magenta, blue, black four, these four generally have a certain limit on the damage to the body, but there is still a great harm to the body, regardless of men and women, and in addition, there are several kinds of ink. For example, gold, silver, like this ink is the most harmful, if you are not careful to get it in the mouth, maybe it will be poisoned and reduce life or death, please be careful! ·！