The previous fast food packaging materials are made of the same material as plastic. High temperature will produce harmful substances and is not easy to degrade. Nowadays, disposable fast food packaging materials mainly include PP polypropylene and PS polystyrene.
These two kinds of fast food packaging materials are non-toxic, tasteless and odorless, PP is soft, generally PP use temperature is -6 degrees to +120 degrees, so it is especially suitable for hot meals, can be heated in a microwave oven, or even The steam is cooked in the steam cabinet. The modified PP can be used at a temperature of -18 degrees to +110 degrees. The lunch box made of this PP can be used in the refrigerator instead of being heated to 100 degrees.
PS fast food packaging material is hard, transparent, but easy to tear, PS starts to soften when the temperature reaches 75 degrees, so it is not suitable for hot rice hot dishes, but the low temperature performance of PS is very good, it is the best packaging for ice cream. material.
In order to reduce the cost, some lunch boxes use PP packaging materials to make boxes and PS as lids. The advantage is that the cover is transparent and the PS is hard. It can be made of thinner materials, which reduces the cost. However, this design consumer must understand two kinds of boxes. The difference in materials, remember not to put the whole box with the lid and put it in the microwave to heat.
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