a. Visual observation, that is, starch products are sub light type, some light yellow or milky white. The color of non starch products is dark or bluish white.
b. Odor discrimination means that starch products have light corn paste flavor or plant flavor after heat generated by friction between similar products, and other products have plastic smell.
c. Combustion discrimination means that the red flame is starch and the blue flame is the other. The black powder after burning ash is crushed by hand is starch product, while the powder foam is light color is other products.
2. The main components are carrier resin, corn starch, coupling agent, wetting agent, solvent, etc.
3. There are two possible causes of floating debris
a. It is caused by excessive addition of lubricant and incomplete devolatilization in the process of processing, which makes the residue on the surface of the product.
b. Inorganic substances such as talcum powder. Formed by adding too much heavy calcium.
Advantages of disposable degradable tableware
Pollution free: because it is refined from corn starch and other environmental protection materials, it does not contain substances harmful to human body, so it can be used for a long time.
Zero pollution: the product is buried in the soil and can be degraded to form carbon dioxide and water after 90 days under the appropriate temperature, which does not cause pollution to the soil and air.
Provincial resources: corn starch is a renewable resource, inexhaustible, and paper tableware and plastic tableware need a lot of wood and petrochemical products. Corn starch can save a lot of oil and forest resources.
High quality: the product has good tightness, water resistance, oil resistance, impermeability, high temperature resistance and low temperature resistance. It is suitable for refrigerators to freeze, refrigerate, keep fresh food and microwave oven heating.
Since 1984, polystyrene tableware has been widely used in China for the first time in the market. According to statistics, China consumes about 10 billion fast food utensils every year, most of which are disposable foam plastic tableware, and the annual growth rate is 25%. Because polystyrene is non degradable and difficult to recover, it brings great inconvenience to the treatment. At present, in the streets and alleys of cities, tourist attractions, along the railway and rivers and lakes. This kind of disposable tableware can be seen everywhere, which has caused serious pollution to the environment. This kind of "white pollution" not only increases the labor intensity of sanitation workers, but also pollutes the land resources and water resources that we rely on for existence, and also brings a lot of inconvenience and harm to people. It is gratifying that China has done a lot of work in this field, and has made great achievements. With the scientific guidance and strong support of the government, various environmental tableware came into being and received good social effects.
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