Disposable fast food boxes have gradually changed from foam boxes. The original foam boxes have been eliminated due to their high temperature resistance and environmental pollution caused by the production process. PP boxes, paper boxes, wooden boxes, biodegradable boxes and so on have been replaced. Among them, PP and PS material are tasteless, melting point is high, plasticity is strong, production is simple and relative cost is low low characteristic, became the mainstream material that makes one-time fast food box consequently. The difference between PP and PS is that PP can be put into the microwave oven, PS can not be high temperature but can withstand low temperature, resolution method PPE than PS material to be soft, PS hard and brittle, higher transparency PS.

PP polypropylene, with mechanical and thermal properties, suitable for food packaging.

A method for the identification of good and bad meal boxes

Take a piece of orange peel and rub it on the foaming box for a few times. Before long, the wiped part on the box will dissolve. The longer the time is, the more serious the dissolution will be.

The orange peel detection method is mainly aimed at foaming meal boxes. The faster the meal boxes corrode, the more toxic components they contain.

Experimental principle: the ingredients contained in lemon and orange have a strong corrosive effect on the styrofoam meal box. When the food containing lemon and orange is contained in the foaming meal box, harmful substances may be consumed together. In addition, the foam box at high temperature, may release toxic and harmful substances.

Fill a glass with water, tear a small piece from a pure polypropylene (PP) plastic lunch box, place it all into the glass and immerse completely to see if the plastic surfaces.

When doing this at home, instead of tearing the plastic box apart, place the entire box in a washing tub filled with water. Make sure the box is fully submerged in water.

Experimental principle: pure polypropylene (PP) plastic lunch box, due to the density of polypropylene is less than 1, diffuse into the water will float on the surface of the impurity polypropylene (PP) plastic duke box, due to the addition of other substances (such as calcium carbonate, talc powder, etc.), the density is more than 1, will sink into the water bottom. Simply put, what sinks when you put it in the water is poor quality plastic lunch boxes.

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