How to use and distinguish disposable lunch boxes and tips
Posted by Admin
Disposable lunch boxes have gradually shifted from foam lunch boxes to environmentally friendly ones. The original foam lunch boxes were phased out because they were not resistant to high temperatures and the production process caused pollution to the environment. Instead, there are PP lunch boxes, paper lunch boxes, wooden lunch boxes, and degradable lunch boxes. etc. Among them, PP and PS materials are non-toxic, tasteless, high melting point, strong plasticity, easy to produce and relatively low cost, so they have become the mainstream materials for manufacturing disposable snack boxes. The difference between PP and PS is that PP can be put into a microwave oven, PS cannot be high temperature but can withstand low temperature. The method of distinguishing PP is softer than PS material, PS is hard and brittle, and PS is more transparent.
PP polypropylene, with mechanical and thermal properties, suitable for the packaging of meals.
How to identify the quality of lunch boxes
Take a piece of orange peel and rub it on the foamed lunch box for a few times. It doesn't take long for the wiped part of the lunch box to dissolve. The longer the time, the more serious the dissolution. The orange peel detection method is mainly aimed at foaming lunch boxes. The faster the lunch box corrodes, the more toxic ingredients it contains.
Experimental principle: The ingredients contained in lemons and oranges are strongly corrosive to the foamed lunch boxes made of polystyrene. When food containing lemons and oranges are packed in foamed lunch boxes, harmful substances may be eaten together. Moreover, when the foamed lunch box is at high temperature, toxic and harmful substances may be released.
Take a glass and fill it with water, tear off a small piece from the pure polypropylene (PP) plastic lunch box, put it all into the glass, and fully immerse it in the water to see if the plastic piece will surface.
When experimenting at home, instead of tearing the plastic lunch box, you can put the complete lunch box into the laundry tub filled with water. Remember to immerse the lunch box completely in the water.
Experimental principle: pure polypropylene (PP) plastic lunch box, because the density of polypropylene is less than 1, will float on the water after being immersed in water; impure polypropylene (PP) plastic lunch box, due to the addition of other substances (such as carbonic acid) Calcium, talc, etc.), the density is greater than 1, and it will sink to the bottom after entering the water. Simply put, what will sink in water is a poor-quality plastic lunch box.
Although the use of foamed lunch boxes was banned in 2001, foamed lunch boxes are still common in the catering market, and consumers are advised not to use them.
When purchasing, it is recommended to choose a colorless and transparent plastic lunch box, which is made of pure polypropylene (PP) and has a high safety factor. Before using disposable plastic tableware, it can be scalded with hot water. If there is an odor, do not use it.