Patent ID: 7175585

Claim:
A sleeve forming apparatus for forming a sheet-like blank into a sleeve used as an outer package of a heat-insulating container, comprising: a mandrel having a body portion which is capable of being fitted inside the sleeve and which is shorter than the sleeve; a curling device for curling up a blank on the mandrel in such a manner that one end portion of the blank to which an adhesive agent is applied is located under another end portion of the blank to form a joint line; a main-sealing device for pressing the joint line onto the mandrel; an assist-sealing device for nipping one end portion of the joint line, which projects from the mandrel by a pair of nippers; an end-curling device for pressing a projecting portion of the blank, which projects from the mandrel, toward the mandrel to form a curled portion of the sleeve; and a sleeve-ejecting device for removing the sleeve from the mandrel.