Is a single-layer or double-layer plastic water cup better?

Most of the plastic water cups we see on the market are single-layer cups. Compared with single-layer cups, there are fewer double-layer plastic water cups. They are both plastic water cups, the only difference is single layer and double layer, so what is the difference between them? Which is better, single-layer plastic cup or double-layer plastic cup?

The main difference between double-layer plastic cups and single-layer plastic cups is that double-layer plastic cups have two major functions of heat preservation and heat insulation that single-layer plastic cups do not have. In fact, it is not just plastic water cups, but also the difference between single-layer and double-layer water cups made of all materials. Double-layer plastic cups have a certain insulation function. Although they cannot be compared with other double-layer material cups, they are much better than single-layer plastic cups. Moreover, the heat insulation function of the double-layer plastic cup is also very good. When using a plastic water cup to hold hot water, a single-layer plastic cup will be hot to hold, but a double-layer plastic cup will not. We can choose the appropriate plastic water cup according to our drinking habits.
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