Process for producing sealed container and blank for sealed container

摘要

A process for producing a sealed container from a tubular blank of square cross section by folding and sealing a container bottom forming portion of the blank to form a flat bottom includes the step of sealing the bottom by collapsing an opening edge part of the container bottom forming portion to a flat form and sealing opposed walls of the collapsed opening edge part as lapped over each other to form a straight bottom seal rib.