BAG HAVING BELLOWS AT SIDE SURFACE THEREOF

摘要

PROBLEM TO BE SOLVED: To provide an opening and closing device, which enables the maximum opening of a bag or a sack at the head end thereof for taking out a filled matter and secures the easy resealing of the bag or the sack after the filled matter is taken out. SOLUTION: Respective pressing closing tapes are formed of two hooked-and- loop fastener tapes 9 composed of a material which can be bonded by fusing itself. The two fastener tapes 9 are mutually faced in parallel and fixed to respective bag walls 4, 5 in a way that they substantially occupy the whole inner width of the bag. Respective V shaped leg pieces 13, 14 of bellows 7 at the both side surfaces in the head end are freely protrudable towards the interior of the bag.