METHOD AND APPARATUS FOR MANUFACTURING PAPERBOARD CUPS

摘要

A method and an apparatus for manufacturing conical paperboard cups from a curvilinear side wall blank (16) and a circular bottom blank which are of polymer-coated paperboard. At least one of two side seam areas (17, 19) of the side wall blank (16) is heated with a laser beam (40) which is guided to move over the side seam area (17) as the blank (16) remains stationary, after which the side seam areas (17, 19) are laid on top of each other and pressed together for forming the side seam of the cup. The bottom seam of the cup can be formed in the same manner by using the laser beam for heating the polymeric coating before pressing the seam areas together.