Organic solvents such as ethanol, isopropanol, butanol, propanol, methyl ethyl ketone, ethyl acetate, butyl acetate, toluene and xylene are often used in printing inks. Although these solvents can be removed by drying, the residual solvents will migrate to food and cause harm to human body.
2. Some organic pigments contain biphenyl glue, which contains carcinogenic components and should not be used.
3. Composite packaging materials use a lot of ink, organic solvents and adhesives in printing. Although these auxiliary materials are not in direct contact with food, some toxic substances will migrate into food during food packaging and storage, which will endanger people's health.
4. There are two kinds of pigments in ink-inorganic pigments and organic pigments, which are insoluble in water and other media and have bright and stable colors. Some inorganic pigments contain heavy metals such as lead, chromium, copper and mercury, which have certain toxicity and cannot be used for printing food packaging and children's toys;
Organic solvents can dissolve many natural resins and synthetic resins, which are important components of various inks, but some of them will damage human body and subcutaneous fat. Long-term contact will make the skin dry and rough. If it penetrates into the skin or blood vessels, it will harm people's blood cells and hematopoiesis with blood. Inhalation into trachea, bronchus, lung or spread to other organs through blood vessels and lymphatic vessels may even cause chronic poisoning.
6. Some inks are toxic to heavy metal ions, and pigments and dyes contain carcinogenic components, which are very harmful to human health.
7. The solvents used in gravure printing ink generally include butanone, xylene, toluene, butanol, etc. Especially butanone, has a strong residual odor.
8. Because the pigment particles in ink are very small and have strong adsorption, although they have been heated and dried during printing, they are often not completely dried because of short time and high speed, especially for printed matter with large inking area and thick ink layer, there are more residual solvents.
9. These residual solvents are brought into the compounding process, which makes it more difficult to escape after compounding and will slowly migrate and penetrate.
Extended data:
Printing factory workflow:
1, customers can consult online or by hotline.
2, professional business personnel door-to-door communication
3. Sign a printing contract and pay the advance payment.
4. Early graphic design
5, customer proofreading and modification
6. The customer has finalized the word.
7, filming, proofing and then let the guests review the final draft.
8, imposition, print PS version
9. Print on the computer
10, post-processing
Baidu encyclopedia-printing plant
Baidu encyclopedia-printing