Food packaging printing safety inspection
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Cigarettes, small foods, children's nutrition breakfast, etc. Carton packaging made of environmentally friendly paper or cardboard, after being processed by various printing methods, the ink adheres to the paper, and harmful substances are transferred to the food. How to check the safety of the product?
We know that printed packaging materials have varying degrees of odor depending on the composition of the ink used and the printing method. The first thing to note is that the emphasis is not on what the scent is emitted, but on the actual impact of the package formed after printing on its contents.
It is well known that taste and smell are chemical sensations, and their stimulating effects are the result of biomolecular reactions. Scientific research shows that the different positions of the tongue produce acid, sweet, bitter and salty taste effects, while the sense of smell is more sensitive, and the nuances can be quickly smelled, but the nose is also very easy to be "fatigued". Continue to work, so it is generally recommended that perfumers do not continuously identify more than three flavors. So, what is the detection standard for the odor of packaged prints? There is a test method used in the German printing industry.
1. Gas chromatography analysis
Gas chromatography is widely used in the production of gravure packaging materials. The content of residual solvent and other odors on the printed package can be objectively determined by gas chromatography analysis. During gas chromatography, the gas passes through a separation column and is measured by the detector, even if there is a small amount of gas. The Flame Ionization Detector (FID) is its primary detection tool that connects the detector to a PC to record the time and the amount of gas leaving the separation column. Each free monomer can be identified by comparison to known fluid chromatography. At the same time, the content of each free monomer can be obtained by measuring the recorded peak area and comparing it with the known volume. In the case of examining the unknown monomer in a folding carton, gas chromatography is usually used together with mass spectrometry (MS) to identify unknown monomers by mass spectrometry. In gas chromatography, the method of headspace analysis is usually used to analyze the folding carton, and the measured sample is placed in a sample vial for heating to vaporize the monomer to be analyzed and enter the head space. The test process described is the same.
2, Robimson detection method
The Robinson test was scaled in the German standard DIN log 55 "Impact of packaging materials on the taste of the test article". For printing, people are concerned with the effects of solvent residues after ink printing. Therefore, printers often use the modified Robinson test method (MHM) for inspection purposes.
In the detection process, the surface of the substrate is printed with an ink amount of 1.5% m2, and then the printed matter and the packaged product, for example, after being sprinkled with chocolate, are rotated for a certain period of time (about one day), and the taste of the package is judged. 5, etc.: 0, etc. There is no change in taste; 1 is difficult to distinguish the change in taste; 2 has a slight change in taste; 3 has a certain change in taste; 4 has obvious changes in taste. Sometimes, some people perform tests under actual environmental conditions, such as testing the carton at a high temperature of 75% RH. The result is usually quite different from the method specified in DIN log 55.
The above two methods provide a quantitative method for evaluating whether the influence of the ink on the odor and taste of the package is safe after the printed matter is printed by practical means, thereby providing a clear method for evaluating whether the carton packaging printing is environmentally friendly and safe. China's printing plants and corresponding departments can refer to foreign advanced testing methods and international standards, and develop testing methods and standards that are in line with international standards and in line with China's production conditions, thus promoting the development of the printing industry.