Toxicological analysis and research related to packaging

First, the existence of toxic substances. Can be roughly divided into the following three situations:
1 The substance itself is toxic such as various pesticides, domestic insecticides, etc. Many heavy metals such as lead, cadmium, mercury, arsenic, etc., and chemical raw materials such as stupid, formaldehyde, and cyanide are toxic, and some are highly toxic. These poisons must be properly packaged. And in the packaging process, try not to let the human body directly contact these substances. 
2 It is common in the packaging industry that toxic substances contained in the product are volatilized during use to pollute the air. Paints and glues are commonly used in the packaging industry. Which may contain a variety of heavy metals and organic volatiles. Organic-based volatiles, such as formaldehyde, may be used in wood-based panels and paperboard, which are easily volatilized when molded into packages. Again, pigments used in making containers from crystal glass are often toxic. Making and using pottery can lead to problems with lead and cadmium poisoning. When making metal containers, you will encounter leaded solders and so on. 
3 The product itself is not toxic, but it will produce toxic substances under certain conditions. Such as chemical reactions with other substances or thermal decomposition and so on. Many plastics decompose at high temperatures, producing a variety of toxic substances. Commonly used packaging materials, such as the so-called "white pollution" foam, will produce toxins and damage the liver at temperatures above 60°C. If these materials are used for packaging, they must not be exposed to high temperatures. For example, automatic strapping machines can release harmful fumes when they are hot-melt adhesive plastic strapping, and they often run straight into the operator's eyes and mouth, irritating the operator’s eyes. And respiratory system. There is also a situation where these material packages are toxic to humans when used in food packaging. A common example is a normal polyethylene plastic bag. 
Second, the harm of toxic substances to human health. There are roughly the following situations:
1 Corrosive - such as various acids and alkalis, various detergents, removers and so on.
2 Irritation - A variety of volatile gases can stimulate people's eyes, mouth, nose, throat and so on. It can sometimes cause allergies and rashes.
3 Toxicity - Toxic substances can affect almost all organs and tissues throughout the body. Studies have shown that carbon monoxide, manganese, lead, mercury, methylmercury, etc. can damage the brain; carbon monoxide, sulfur dioxide, etc. will damage the heart; mercury and cadmium will damage the kidney; selenium, chlorinated hydrocarbons, etc. will damage the liver; fluorine, Lead, zinc, etc. can damage the bones; arsenic, bismuth, nickel, chromium, acid and alkali can damage the skin; chlorine and cadmium can damage the blood vessels; lead, fluoride, arsenic, vanadium, etc. can damage the intestine; fluorine and selenium can damage Teeth; Formaldehyde and other volatile gases can damage the eyes, nose, and throat; benzene can damage hematopoietic function; asbestos, dust, radon, sulfur dioxide, ammonia, cadmium, ozone, nickel carbonate, hydrogen sulfide, etc. can damage the lungs and so on.
4 Radioactivity - Many printing machines and detection equipment used in the packaging industry produce ionizing radiation. Nowadays, people are generally concerned about major toxicities to the human body, such as fatal or carcinogenic, while neglecting other forms of poisoning to people's physical and mental health, such as headache and lack of energy.