Metal caps ophthalmic control

With the continuous progress of society, people are paying more and more attention to the requirements of dietary health and food safety. In recent years, o-phenylbenzenes, one of the additives of PVC sealing materials, have attracted wide attention, their control standards are very confusing, the standards are not clear, and they lack operability, which has seriously restricted the food and food packaging in China. The normal operation and development of the industry, relevant standards need to be improved.

O-phenylbenzenes are used as modified additives of PVC plastics and have been widely used in food packaging materials since the 1930s. They have played a significant role in the rapid development of food packaging, storage and food industry. Since the 21st century, a large number of scientific experiments in the European Union have shown that DEHP and other o-benzenes show a certain degree of toxicity in mouse experiments, and the World Health Organization specifies DEHP's tolerance to human intake (TDI). For 0.025 mg/Kg, calculated as adult human body weight 60 Kg, the safe amount of DEHP intake per day through the diet is 60 × 0.025 = 1.5 mg. Based on this, the European Union issued Directive 2005/84/EC in 2005, which stipulated that the 6 ophthalmic benzene substances limit the use requirements in children's products. In 2007, it issued the directive 2007/19/EC, and stipulated 6 ophthalmic benzenes. Substances are restricted from use in food packaging materials. According to the requirements of the European Union Directive, 6 items of o-benzenes such as DEHP are restricted in food contact materials such as cap gaskets: 1 The content of o-phenyls in the material must not be greater than 1000 mg/kg; 2 The migration of o-phenyls in the material enters The content of food must not exceed its SML value (the SML value of DEHP is 1.5 mg/kg). The EU Regulation No. 10/2011, which came into effect in May 2011, even raises these requirements to the EU legal level and enforces them.

After GB9685-2008 "Hygienic Standards for Additives for Food Containers and Packaging Materials" came into effect on June 1, 2009, 16 items of phthalic acids such as DEHP were restricted in use in China: 1 DEHP and other o-benzenes are in contact with water-based foods. The material can be used in an appropriate amount; 2 The content of o-phenyls species migrated into the food must not exceed the SML value (the SML value of DEHP is 1.5mg/kg); 3DEHP and other o-benzenes may not be used in materials that contact fatty foods. use. It is the requirement that “o-benzenes should not be used in materials that come into contact with fatty foods” has caused confusion in the food industry and food packaging industry in China. "DEHP and other o-benzenes cannot be used in materials that come into contact with fatty foods." Because they have not followed the EU's determination of appropriate quantitative indicators, they are often over-supervised as "not detectable" in China's actual regulatory control (according to GB/T 21928- The detection limit of 2008 “Determination of phthalic acid esters in food packaging materials” is 0.05mg/kg. This over-monitoring is unscientific and impractical. We need to revise it as soon as possible in future work. perfect.

First of all, the detection of trace amounts of o-phenyls in the cap gasket does not violate the requirements of GB9685-2008, “O-phthalates should not be used in materials that come into contact with fatty foods”. If the ophthalmic plasticizer is added to the bottle cap production process, then the ophthalmic benzene content of the cap gasket should be at least a percent of the concept, that is, it will reach 10,000 to 100,000 mg/kg, and vice versa. A very small amount of tens of mg/kg of benzene was detected, which means that it is not intentionally added by the manufacturer. In fact, due to the influence of the purity of raw materials for food contact materials and the prevalence of benzene-related substances in the natural world, even if we do not control the use of o-benzenes for many years in our spin-on-cover production, we still have traces of o-benzenes. The detected phenomenon exists.

Second, trace amounts of o-benzenes in the caps are inevitable. Baidu's "Phthalates" can be used to obtain more than 1.55 million benzene-related substances. Introduction: The annual global consumption of phthalates is more than 3 million tons, of which more than 30,000 tons are o-benzenes. Substances have flowed into the natural world through various channels. At present, phthalate plasticizers have been detected to varying degrees in almost all oceans, atmospheres, drinking water, animals and plants and newborn infants. It has already formed a relatively serious environmental pollution throughout the natural world. In addition, the inspection and testing of o-benzenes is a testing project that has just been launched in recent years in China. The major testing organizations in the country have “standard sample control”, “sample processing”, “assisted extraction selection”, and “test sample control” for o-benzene detection projects. Various aspects such as pollution control in the detection process are still being explored and perfected. Even in many authoritative national testing organizations, the detection of o-phenylbenzenes is still carried out as an exploratory project, and there are still very large detection errors among the authoritative testing organizations. The actual detection limit can usually only reach several to several tens of mg/kg.

Once again, the presence of trace amounts of o-phenyls in the cap does not have an adverse effect on human health. According to the EU's scientific research conclusions, the content of o-benzenes in food packaging materials such as bottle caps is less than 1000 mg/kg, and the content of o-phenyls in foods transferred to foods is less than 1.5 mg/kg, so this kind of packaging is safe. In fact, due to the fact that the capacity of cap-packed foods is usually 100 to 200 times the weight of their gaskets, even under the most severe conditions, all o-phenylbenzenes in cap gaskets migrate into foods, and o-benzene in foods The concentration of the substance should also be diluted 100 times or more, that is, if 150mg/kg of o-phenylbenzene contamination is detected in the cap gasket, even in the worst case conditions, the adjacent bottle cap gasket All benzenes migrate into foods, and the solubility of o-benzenes in foods will not exceed the food safety limit of 1.5 mg/kg.

In summary, China's monitoring of "non-useable" substances in the contact of fat-soluble foods with o-benzenes can not be simplified across the board, requiring "not to be detected," but scientific and quantitative regulations should be introduced as soon as possible so as to fundamentally Resolve bottle cover food safety and guide the healthy and stable development of the food industry and food packaging industry.

Postscript:

This article is worth reading. Mr. Xu Dixing raised many questions that people in the industry are puzzled by. This is not only a serious and sensitive topic, but also a topic that must be taken seriously and should be solved because it concerns the survival and development of many of our companies. We hope that there will be more people in the industry who have opinions and opinions. Our editorial department will summarize the opinions of everyone and give feedback to relevant departments for reference.