Detection of the hottest food packaging and printi

2022-08-18
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Editor's note: with the rapid development of the world economy, packaging and printing are showing a colorful scene, and more and more beautiful packages are produced in printing plants. People pay attention to the taste of these beautiful "clothes" while appreciating the beautiful packaged clothes, especially food packaging. This is a very important issue - the safety of food packaging printing materials

cigarettes, snacks, children's nutritional breakfast and other cartons made of paper or cardboard made of environmentally friendly materials, after being processed by various printing methods, will the ink adhere to the paper, which will have a negative impact on the package content, or will there be harmful substances transferred to the food, that is, whether there are unsafe factors? Especially for gravure printing ink commonly used in cigarette printing, which has a long service life, how to test the safety of this dosage form ink print

we know that the packaging materials after printing have different degrees of smell, which depends on the printing method used or the composition of the ink. How to evaluate these smells? First of all, it should be noted that our emphasis is not on the smell it emits, but on the impact of the packaging materials formed after printing on the contents of the packaging. We hope that the packaging will not affect the smell and taste of its contents as much as possible

as we all know, taste and smell are chemical senses, and their stimulation is the result of biomolecular reactions. Scientists' research has proved that different positions of our tongue will produce sour, sweet, bitter and salty taste effects, and our sense of smell is more sensitive, and we can quickly smell subtle smells, but at the same time, our nose is also very tolerant. The experimental machine in China focuses on supporting the batch synthesis technology of carbon nanotubes and graphene. The machinery industry has this very important position, and it is easy to stop working because of "fatigue", Therefore, it is generally recommended that perfume manufacturers do not identify more than 3 kinds of flavors continuously. Then, how to detect the odor of packaging and printing materials and what is the detection standard? This paper briefly introduces several detection methods used in German printing industry for reference

I. gas phase composites are composed of layered transverse carbon fibers. Chromatographic analysis

gas chromatography is widely used in the production of intaglio printing packaging materials. The content of residual solvents and other odors on printed packages can be objectively determined by gas chromatography. In the process of gas chromatography analysis, the gas passes through a separation column and is measured by the detector. Even a small amount of gas can be detected. Flame ionization detector (FID) is its main detection tool. Connect the detector to a PC to record the time and the amount of gas leaving the separation column. The free monomers can be identified by comparing with the 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. When investigating the situation of unknown monomers in folding cartons, gas chromatography and mass spectrometry (MS) are usually used together to identify unknown monomers by mass spectrometry

in gas chromatography, headspace analysis is usually used to analyze folding cartons. Put the tested sample into the sample vial for heating, so that the analyzed monomer vaporizes and enters the headspace. The subsequent process is the same as the test process described above

II. Robinson detection method

defines Robinson detection method in German standard DIN 10955 "influence of packaging materials on the taste of tested objects". For printing, we are concerned about the influence of solvent residues after ink printing. Therefore, printers usually use the improved Robinson test method (mhm) to achieve the purpose of detection

in the process of detection, print with an ink volume of 1.5g/m2 on the surface of the substrate, and then judge the taste of the packaging after placing the printed matter and the finished packaging product, such as chocolate, for a certain time (about a day). The results are usually divided into five grades: 0= the taste has not changed; 1= it is difficult to distinguish the change of taste; 2= slight change in taste; 3= there is a certain change in taste; 4= the taste has changed significantly

sometimes, someone tests under actual environmental conditions, such as placing the carton under 75% RH in high humidity. The result of this test is usually quite different from the method specified in DIN 10955

the above two methods quantitatively detect whether the influence of ink on the smell and taste of packaging after printing is safe through experimental means, so as to provide a clear method for evaluating whether carton packaging and printing are environmentally friendly and safe. China's printing plants and corresponding departments can refer to foreign advanced testing methods and international standards to formulate testing methods and standards that are in line with international standards and in line with China's production conditions, so as to promote the development of printing

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