A STRAW PREVENTING A BACKWARD FLOW

摘要

A backward-flow preventing straw is provided to prevent beverage from flowing backward by a backward-flow preventing tub formed between an inlet portion and an outlet portion. The backward-flow preventing straw includes an inlet portion(4) having a first foldable corrugated portion(A), an outlet portion(5) having a second foldable corrugated portion(B), and a backward-flow preventing tub(2) connectedly formed between the inlet portion and the outlet portion. The backward-flow preventing straw is used in an S-shape using the first foldable corrugated portion and the second foldable corrugated portion. A volume of the backward-flow preventing tub is larger than that from the second foldable corrugated portion to an outlet port(3).