Perspective on the performance index of safety and

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Milk plastic packaging: Perspective on performance indicators of safe and hygienic packaging

among all nutritional sources, milk, as a complete food, can provide most of the nutrients required for human growth and development. Therefore, as one of the best foods, it is widely eaten all over the world. Milk is extremely nutritious, so it is also very easy to deteriorate and decay. In order to keep fresh in the circulation process and provide it to consumers safely and healthily, milk must be packaged safely. Our performance requirements for milk packaging include:

safety and health indicators of milk packaging

since milk is for people to eat, packaging materials, printing inks, composite adhesives, blow molding particles and additives must meet the requirements of food hygiene standards of packaging materials and food packaging regulations, non-toxic Odorless, odorless, less residual solvents, no toxic heavy metals, etc

safe and non-toxic

various additives, such as antioxidants, antistatic agents, and smoothing agents, need to be added in the process of plastic film processing and molding. All processing aids, color masterbatch particles, raw material particles, inks, adhesives, solvents, etc. must pass the test and detection of gb15193 food safety toxicology evaluation procedure, and can only be used after being proved safe and non-toxic through acute toxicity test and chronic toxicity test

meet the national food hygiene standards for packaging materials

there are many national hygiene standards for food packaging materials, including raw materials, processing aids and molded products. In the hygienic standards for molded products, commonly used ones are: polyethylene packaging material gb9687; Polypropylene packaging material gb9688; Polystyrene plastic cup gb9689; Polyester plastic bottle gb13113; Paper gb11680; Composite bag gb9683, etc. In liquid milk packaging, generally, single-layer or three-layer coextrusion black-and-white bags must meet gb9687, while EVOH five layer coextrusion black-and-white bags, PVDC coated three-layer coextrusion black-and-white bags, PVA composite bags, paper-based composite packaging materials, etc. are recommended to meet gb9683, and its coextrusion blow molding layer PE must meet gb9687. The difference between gb9683 and gb9687 mainly lies in the content of toluene diamine and the amount of n-hexane evaporation residue. The content of toluene diamine is aimed at the adhesive in the composite smooth switching bag. Toluene diamine is a carcinogen. The amount of n-hexane evaporation residue is not more than 60mg/l in gb9687 hygienic standard for polyethylene molded products, and not more than 30mg/l in gb9683 hygienic standard for composite packaging bags. This index mainly simulates the dissolution of food packaging materials in oil immersion solution. If the production enterprise controls it improperly, it is very easy to exceed the standard. During the gb9683 test, the soaking conditions and nominal capacity must be strictly stipulated to ensure the accuracy of the test results, and these data can be queried and monitored in a special chart to ensure their scientificity and impartiality. The soaking condition of packaging bags with sterilization temperature higher than 60 ℃ is 120 ℃ for 40min, and that of others is 60 ℃ for 2hr; It is appropriate to make it into the actual size of the packaging bag and soak it on the inner surface. If the whole packaging material is soaked, it will not only soak the inner and outer surfaces, including printing ink, but also its nominal capacity cannot be accurately calculated

specify the amount of residual solvent

general dairy packaging bags need to go through printing, compounding, blow molding and other processing procedures, while printing ink and composite adhesive contain a certain amount of solvent. In production, some solvents need to be added to adjust the printing suitability and dilute the adhesive to facilitate coating and other functions. As processing aids, the solvent must meet the requirements of gb9685 hygienic standards for the use of additives for food containers and packaging materials, and alcohol or ketone solvents must be used. For food packaging, the requirements for odor and potential toxicity are more and more strict, and the lower the solvent residue is required, the better. According to the national standard, the total amount of solvent residues in insulating electrical bushings and accessories JG 3050 (1) 998 for buildings is less than 10mg/m2, and the residual amount of solvent in the power supply of benzene and ester computers and printers is less than 3mg/m2. The enterprise standard may be higher than the national standard, that is, the total amount is less than 5mg/m2, and the residues of benzene and esters are less than 2mg/m2

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