Analysis of the impact of the hottest packaging ma

2022-08-08
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Analysis of the impact of packaging materials on food safety (Part 1)

Plastic packaging materials in China, especially soft composite packaging materials for food and drugs, have developed rapidly in the past two decades, with not only many manufacturers, but also many product varieties and quality reaching a certain level. However, in the process of the rapid development of the packaging industry, we focus on the scale, output, physical and mechanical properties, high and low temperature resistance requirements, and medium erosion resistance, but we do not pay enough attention to the health and safety performance of the packaging materials themselves. Therefore, many manufacturers of composite packaging materials have some unsanitary and unsafe hidden dangers in the purchase and use of raw and auxiliary materials, the improvement of production conditions, and the detection of finished products; Many food and drug manufacturers do not consider the impact on the health and safety of contents and human body when using packaging materials. They only pay attention to fastness, strength, appearance and price, and at most care about whether there is peculiar smell. Generally speaking, in the past, people paid little attention to the potential impact of packaging materials on the health and safety of food and drugs and the global environment. Therefore, there is still a big gap between the health and safety quality of packaging materials in China and the world advanced level. Since the first two or three years, the state has supervised and inspected the hygiene and safety of food itself, implemented the reassuring food project, and implemented the QS certification and market access system. Since June this year, the health and safety problems of food packaging materials have been supervised and tested. The media has exposed some benzene exceeding the standard in food packaging bags, which has aroused great concern of the whole society. This is an important measure taken by the Chinese government to put people first and protect the safety and health of consumers, and it is a manifestation of social progress. However, at present, the content of detection and media exposure of functional departments is limited to the surface phenomenon that most people can smell and smell benzene solvents exceeding the standard, but the more potential hazards of heavy metals (lead, cadmium, mercury, chromium), carcinogens (aromatic amines, halogenated biphenyls, polycyclic compounds, aldehydes, etc.) to human health, which are undetectable to ordinary people, have not been involved. With the improvement of people's quality and the strengthening of self-protection awareness, in the future, the health and safety requirements of food and drug packaging materials in China will certainly not stay at the current level, and will gradually be raised to the same standards as the United States or Europe, which is not only harmless to human health and safety, but also harmless to the earth's environment

the state has established a food safety committee, and provinces, cities and autonomous regions have also established food safety committees. In many places, the main leaders of provinces, cities and autonomous regions serve as the heads of the committee, indicating that the government attaches great importance to this issue. At present, China is advocating the safe food project, which advocates the implementation of whole process monitoring, inspection and testing from the field to the table. Packaging material is the last hurdle. If it is hygienic and safe, the food we put in our mouths can be hygienic and safe. Otherwise, the best food will be polluted and become a killer endangering human health

first, the impact of packaging materials on food safety

without good packaging, there will be no good food. Without Assured packaging, there will be no assured food. Packaging materials become the last hurdle. Then, why does the food and drug packaging materials have an impact on the packaged contents? What is its relationship with human health and safety

this should be investigated from the national standard gb9683 "Hygienic standard for composite food packaging bags", the raw materials and production environment of composite packaging materials

the hygienic indicators of GB hygienic standard for composite food packaging bags are shown in the following table (among which "the main source of data" is the author's personal view):

the main source of project index data is

Methylenediamine (4% acetic acid), mg/l <0.004 adhesive

evaporation residue, mg/l

4% acetic acid <30 inner membrane

normal temperature, 2h <30 inner membrane

65% ethanol, normal temperature, 2H < 30 inner membrane

(refers to the composite bag with polyethylene plastic film as the inner layer)

potassium permanganate consumption (water), mg/l < 10 inner membrane

heavy metals (calculated by Pb), 4% acetic acid mg/l < 1 inner membrane, ink

note: soaking conditions: a. the composite bag with the use temperature (including sterilization) of 60 ~ 120 ℃ is 120 ℃, 40min; b. The composite bag with temperature lower than 60 ℃ is 60 ℃ for 2h

at present, most food and drug composite packaging materials are made of plastic film (polyethylene, polypropylene, polyester, nylon, cellophane, aluminized film) and aluminum foil or paper, printed with gravure ink of organic solvent type, compounded with two-component PU glue of organic solvent type, and a small amount of water-based ink printing and water-based adhesive. Among them, the inner membrane in direct contact with the packed contents (food and drugs) is made of polyethylene or polypropylene particles through film blowing or tape casting. Of course, this basic particle material must first be non-toxic, tasteless, safe and hygienic, and must meet the health standards for food. However, when using them to process and make films, many additives, such as antioxidants, heat stabilizers, smoothing agents, etc., are often added. These low molecular weight additives cannot exceed the specific variety limits and maximum usage limits specified in gb9685 "health standards for the use of additives for food containers and packaging materials", Substances that are not permitted in this standard are often harmful to human body, and they are not allowed to be used, and substances that are permitted to be used cannot exceed the limit of maximum use, otherwise evaporation residues or potassium permanganate consumption indicators will be unqualified. Too much residue or too much potassium permanganate consumption indicates that there are too many unstable substances that can be extracted and permeated into the contents, which are easy to be oxidized. If they permeate and migrate to food and drugs, they may produce peculiar smell and reduce the cross-sectional area; If absorbed by human body, it may cause harm to health. At the same time, in the process of film making, if the temperature is too high, it will cause the cracking and oxidation deterioration of raw materials. In addition to the unpleasant smell of burnt paste, the low molecular substances produced by cracking and degradation will also increase the evaporation residue or exceed the consumption of potassium permanganate. Therefore, the film itself must be strictly tested, and all indicators should meet the health standards of synthetic products before use

1. The impact of printing ink on food safety

most of the inks printed on composite packaging bags are organic solvent gravure inks containing toluene and xylene. Among them, there are two aspects that are closely related to food hygiene and safety or human health:

one is that benzene solvents have not been licensed in gb9685 standard for a long time, but are still widely used in the actual situation, This Electromechanical is the soul of all components, which is very inappropriate. The boiling points of toluene and xylene both exceed 110 ℃. During the printing process, the drying temperature is only 70-80 ℃, rarely more than 90 ℃, and the speed is very fast, up to 150m or even 250m per minute. The solvent cannot be completely removed, and some of it will always remain in the ink layer. If absorbed by the human body, it will damage the human nervous system and destroy the hematopoietic function of the human body, and will cause typical permanent benzene poisoning symptoms such as vomiting, insomnia, anorexia, fatigue, decreased white blood cells, decreased resistance, etc. it accounts for a large proportion of occupational diseases (such as shoemaking, luggage industry, paint industry, decoration industry, etc.) and has long been opposed by people. At present, the problem of residual benzene solvents exceeding the standard is of concern

the second is the presence of heavy metals (lead, cadmium, mercury, chromium, etc.), aniline or fused ring compounds in pigments and dyes used in inks. Heavy metal talent continues to deform. If the plastic deformation is to be increased, the lead in the genus will hinder the physical and intellectual development of children, and Mercury will be harmful to the nervous, digestive, endocrine system and kidney of the human body, especially for the fetus, which can be used for a long time at a temperature above 240 ℃; And babies are more harmful. It also damages the human brain and leads to death. Cadmium can cause bone damage and "pain", while aniline or fused ring dyes are obvious carcinogens and pose a great threat to human health. Therefore, the harmful substances in the printing ink of packaging bags have an obvious and serious impact on food hygiene and human health

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