Just wondering about this as a I see a co-worker drinking multiple cups of coffee from same cup. And then whenever I get a drink while im out and then give me a paper straw, it becomes useless if I don’t finish the drink quickly.
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Most paper cups are lined with something to make them water resistant. Usually plastic, occasionally wax. If you put hot liquid in the wax ones, the wax become part of the beverage. If you put cold liquid in there plastic ones, the condensation on the outside eventually soaks the paper to the point it will crumple if you try to pick it up. A waxy straw would lead to waxy teeth. A plastic coated paper straws defeats the intended purpose of the paper straw.
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