VENTILATION PLUG AND VENTILATION PLUG ASSEMBLY BODY

PROBLEM TO BE SOLVED: To provide a ventilation plug and a ventilation plug assembly body high in liquid pressure resistance at the time of using it and capable of preventing the ventilation plug from being damaged at the time of mounting it or using it. SOLUTION: This ventilation plug assembly body S mounted in a mounting hole 51 of a case B1for which water-tightness and gas permeability are demanded is constituted of the ventilation plug S0, a ventilation plug mounting body A and a cap body C. The ventilation plug S0is constituted so that a ventilation sheet K is integrally connected to one end surface of the roughly cylindrical ventilation plug main body 1 in a state of closing a ventilation hole 2, and the ventilation sheet K is a laminated article of a ventilation sheet main body 4 and a reinforcing ventilation sheet 5 higher in permeability than it and integrally connected by anchoring work that a part of heated molten resin R enters the inside of a small ventilation hole 6 directed in an irregular direction of the ventilation sheet main body 4 by injection pressure P of resin at the time of injection molding of the ventilation plug main body 1. In this state, each of first and second ventilation passages 37, 39 communicating the ventilation hole 2 and the outside through to each other is formed between itself and the ventilation plug S0. COPYRIGHT: (C)2004,JPO