The maximum thermal resistance of paper cups is only 100 degrees, which definitely cannot withstand the high temperature baking in the oven.
Generally, most paper cups on the market are made of fiber pulp, and then the inner layer is coated with adhesive film for use; Therefore, the heat resistance temperature is within 100 degrees, and if the cup is thinner, the heat resistance is even less than 70 degrees.
Generally, the oven temperature for baking pastry soup is at least 220 degrees. If the paper cup can't stand the high temperature, the dissolved plastic poison will do harm to human body.
If you want to bake a cake, you need to buy a special cake paper cup.
Extended data:
Application of paper cups in beverage packaging
1, the biggest function of paper cups is to hold drinks, such as carbonated drinks, coffee, milk, cold drinks and so on. This is its earliest and most basic use.
Beverage paper cups can be divided into cold cups and hot cups. Cold cups are used to hold cold drinks, such as carbonated drinks and iced coffee. Hot cups are used to hold hot drinks, such as coffee and black tea.
2, the use of paper cups in advertising, advertisers or manufacturers also use paper cups as an advertising medium.
The pattern designed on the cup body can give people different drinking moods, and it is also a "sign" to promote a certain product. Because the trademark, name, manufacturer and distributor of the product can be designed on the surface of the paper cup. When people drink drinks, they can learn and know the products from this information. Paper cups provide a platform for people to understand these new products.
Paper cup hazard
Using recycled polyethylene as inferior paper cups will produce many harmful compounds. Almost every family and unit will prepare disposable sanitary paper cups for one person to use and throw them away after use, which is both sanitary and convenient. Dong Jinshi, vice president of the International Food Packaging Association, pointed out that disposable paper cups are "the most unsanitary".
Expert analysis
Dong Jinshi introduced that there are three kinds of paper cups in the general market. One is made of white cardboard, which is not waxed. It is mainly used to dry things, which is relatively safe. The disadvantage is that it cannot hold water and oil.
Raw material problem
Waxed paper cups were used the most before. They are soaked in wax and can only hold cold drinks, not greasy things, because oil can dissolve wax. Wax will melt at about 40℃, and it contains carcinogenic polycyclic aromatic hydrocarbons.
At present, the most widely used paper-plastic cup is a kind of inner polyethylene plastic film, with a layer of paper outside and a layer of coated paper inside. Although the outer layer is paper, it is the inner plastic film that comes into contact with food, so it is controversial to define this cup as a paper cup or a plastic cup. In terms of testing, the quality of paper and plastic should be tested.
Without wax, people may think that paper-plastic cups are safe. In fact, it has the most risk factors. The health hazard of outer paper is very prominent. If there is water in the outer layer, it will be moldy and the paper cups will be stacked together. If there is mold outside, it will inevitably pollute the inside. When using paper cups, be sure to see if they are damp and moldy. The second is the ink printed on the outer layer, which is irritating, generally the taste of ink, and the taste is probably not up to standard. Many ink components contain benzene and toluene, and benzene is recognized as a carcinogen. The United States, Japan and other countries are using benzene-free ink, and China is still using benzene-containing ink.
Some paper cups may be made of waste paper. In order to make paper cups look whiter, manufacturers will use bleach in production. Some manufacturers can also use phosphors to increase whiteness. According to national regulations, fluorescent powder is not allowed in food paper. Therefore, the whiter the paper cup, the less safe it is.
The plastic film on the inside, if it is food-grade plastic, can meet the national requirements. If industrial plastics are used, plasticizers will be added to the paper cups to increase the toughness and rigidity of the cups. If the dosage is too large or illegal plasticizer is used, the sanitary conditions will be difficult to guarantee.
Dong Jinshi suggested using less disposable paper cups and using them scientifically. Paper cups of the same color should be filled with hot drinks and heated to harden. Plastic cups will harden when they are cold, so it is better to put cold drinks in them. Paper-plastic cups can't hold oil, but oil can penetrate plastic; Because of the strong permeability of phosphor and ink, it will pollute food, so the convenient tissue box should not be heated by microwave oven as far as possible.
High temperature baking will poison liver and kidney.
Generally, vendors are often seen selling baked soup in paper cups in the market, but some experts say that the maximum thermal resistance of paper cups is only 100 degrees, which is definitely unable to withstand high temperature baking in the oven. Drinking this soup baked in a paper cup will cause the plastic poison to be swallowed, causing a burden on the liver and kidney.
Lin, director of the Department of Toxicology at Chang Gung Memorial Hospital in Linkou, Taiwan Province, pointed out that "the plastic film of the paper cup itself will be destroyed after the paper cup is baked at high temperature. At the same time, there may be some organic solvents or materials for making plastic films, and some raw materials will run out. In the long run, it is actually bad for liver and kidney. "
Generally, most paper cups on the market are made of fiber pulp, and then the inner layer is coated with adhesive film for use; Therefore, the heat resistance temperature is within 100 degrees, and if the cup is thinner, the heat resistance is even less than 70 degrees.
Generally, the oven temperature for baking pastry soup is at least 220 degrees. If the paper cup can't stand the high temperature, the dissolved plastic poison will do harm to human body.
References:
Baidu encyclopedia-disposable paper cups