Requirements for the manufacture and use of inks f

2022-08-15
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Requirements for the manufacture and use of inks for food packaging in Germany

European countries have quite strict requirements for food packaging, but there are no specific regulations on printing inks for food packaging at present. Therefore, the ink manufacturer is obliged to comply with the "requirements for the manufacturing method of food packaging ink". This paper introduces the current requirements for the manufacture and use of food packaging inks in Germany

last year, it was found that there were trace residues of isopropylthiophane (itx) in different beverages in Germany. This residue involves photoinitiators used in UV curing inks. When the printed matter is wound, a small amount of itx is transferred to the unprinted back through ink adhesion, and it also enters the food with the production and filling of the package. This situation has aroused great concern of the public, policies and competent departments in the society

the European community framework rule 1935/2004 stipulates that materials and substances in contact with food, whether printed or non printed, are not allowed to transfer the following harmful ingredients to food: endanger human health, cause harmful changes in food ingredients, and cause the impact of food quality on sensory organs

legal basis

so far, there is no special legislation on the limit value of printing ink, permitted or prohibited substances and evaluation methods. This situation has prompted people to try to borrow norms in areas similar to technology. In addition, manufacturers who join the European printing ink Association have been subject to the "requirements for the manufacturing method of printing ink for food packaging". The most important basis for evaluating ink composition is "specification 2002/72 (on plastics and articles in contact with food)". It not only stipulates the total migration limit value, but also stipulates the migration limit value and the maximum allowable residue of a single material in daily necessities. Based on this, the common faults of materials listed in the plastic specification and used in inks are evaluated when doing tensile tests. Of course, most ink raw materials are not included in the plastic specification. In order to protect the interests of consumers, printing ink manufacturers have stipulated a unified production method. It specifies the selection of raw materials, the requirements for their purity and the impact on sensory properties (odor and taste), as well as the consideration of packaging structure and the impact of printing process

ink composition

the following describes how the printing ink composition must meet the requirements of food packaging. Sheet fed offset printing is the most flexible printing method in terms of using different paper, paper size, paper weight, printing design method, surface finishing and post press processing. The drying mechanism of sheet fed offset printing ink is still characterized by thin oil penetration and oxidative drying of vegetable oil. However, the flexibility of sheet fed offset printing and the low use cost of the printing press must be at the cost of waiting for a few hours of oxidation drying time

German food packaging ink manufacturing mechanical property experiment opportunity the reason why the next use cannot be started and the requirements for use due to the improper use of the customer last time

tasteless

considering the requirements of food packaging, there are some defects in the drying mechanism of sheet fed offset printing ink. When vegetable oil is oxidized and crosslinked, the thin oil becomes a three-dimensional crosslinked solid. In addition to the required polymerization, it also produces low molecular volatile fission products, which give off a special smell (after the ink is dried). This fission product will be transferred to food and change the taste of food. If you use barrier free packaging for sensitive food, you must abandon the mechanism of ink oxidation and drying. This means that the mechanical strength and wear resistance of printed matter are worse than those of commonly used offset inks

therefore, when using non oxidative dry offset printing odorless ink, it is best to cover its surface with odorless water-based varnish. To evaluate the odourless grade of printed matter, the test of sensory Center (Robinson test according to din10955 standard) or analysis and inspection on fission products (measurement of acetaldehyde content) are mostly used

the harm of migration

because the packaging structure has no barrier layer, there is a danger that the substances contained in the ink are transferred to food through the substrate, so it is necessary to use non migration ink. This kind of ink has no substance with molecular weight less than 1000

this low molecular substance is particularly easy to diffuse through the substrate due to molecular motion

the market capacity of plastic extruders will be further expanded. In order to make the ink penetrate, the molecular weight of thin oil used is usually less than 1000, so the ink without migration does not contain thin oil with low molecular weight, but its penetration is slow. For this reason, it is necessary to take some measures, such as increasing powder spraying, a small amount of printing accumulation, and using water-based varnish to cover its surface. In order to test the migration state of ink substances, the printed matter is tightened in a migration tank for testing. Contact the unprinted side with the food simulant. After the specified time and temperature, the chemical analysis shows which ink contains substances passing through the printed matter and how much

recently, Flint ink group launched tasteless and non migrating sheet fed offset printing ink on the market for food and cigarette packaging printing. Due to many factors, making food packaging is a very complex process. From a purely legal point of view, the manufacturer of the final product has to cooperate with all participants to stipulate all requirements and steps of the manufacturing process. If necessary, carry out migration test or check the impact on the senses. Only in this way can we ensure that food packaging can meet the technical and legal requirements

reprinted from: China food industry

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