MANDREL FOR MOLDING CONTAINER BOTTOM AND METHOD OF MANUFACTURING THE SAME

摘要

The container bottom molding mandrel fitted with a container blank when folding and sealing a portion that is to become a container bottom of a square tubular container blank B into a flat shape includes a tubular mandrel main body 31 having four contacting parts 41 along which four corners of the container blank B lie; a bottom plate 32 for closing the basal end of the mandrel main body 31; and a top plate 33 for closing the distal end of the mandrel main body 31. The mandrel main body 31 is made of a thin thickness pipe molded article. A part 42 having a concave traverse plane is formed between adjacent contacting parts 41.