1, difficult to tie and the hardness of the paper straw
As the name suggests, paper straws are made of paper. The main material of paper is wood pulp. The common bleached sulfate coniferous wood pulp raw materials mainly come from spruce, cedar and other trees, which have thin cell walls and long fibers, so the material characteristics are softer and less hard.
In contrast, the milk tea cup is much stronger. The cover of the general milk tea cup is mostly made of high temperature resistant polypropylene material, which has high hardness and is not easy to bend, and the tight tension during covering also increases the difficulty of destruction. In this way, even if the paper straw is made into a pointed shape, it is still difficult to Pierce, and later it may only be violently torn.
2, the difficult suction is related to the water absorption of paper straw material
Paper is made up of small plant fibers, and there are many gaps between the fibers. When the liquid contacts the surface of the paper, it will be sucked into the paper due to the capillary phenomenon. The small materials such as pearls and taro balls are soaked in liquid and expanded, and the surface water is more. When passing through the inner wall of the paper straw, the water molecules of these small materials will not be affected by gravity and "run" to the inner wall of the raw material fiber of the paper straw, resulting in easy sticking.