In the bag null bag itself

摘要

PROBLEM TO BE SOLVED: To sufficiently ensure durability and expansion property of a hole part.;SOLUTION: A hole part for a constructed part in which an active pipe part penetrates and a hole part 2 for inserting hand in which a working hand is inserted for the active pipe part are formed in a bag for no blow work. An expansible hole forming plate 5 having the hole part 2 for inserting hand is attached to an opening part 4 of a bag main body 1. The hole forming plate 5 is composed of a circular ring part 5A formed around the hole part 2, a thin-walled part 5B formed around the circular ring part 5A, a thick-walled part 5D sticked to the bag main body 1, and a tapered part 5C whose thickness is gradually reduced from the thick-walled part 5D to the thin-walled part 5B.;COPYRIGHT: (C)2006,JPO&NCIPI