Method for protecting the untrimmed edge of a paperboard or paper

A method for protecting untrimmed edges of two adjacent paperboards or papers (1, 5) continuous in such a way that at least one separate profile (3) is disposed at a portion to be sealed and the at least one separate profile is sealed to the edges (4) of the paperboards or papers (1, 5), comprising the steps of:

• disposing the at least one separate profile (3) between the edges (4) of the paperboard or paper (1, 5) in such a way that a middle part of the at least one separate profile (3) is left between the edges (4) of the one of the paperboard or paper (1, 5);
• abutting the edges (4) of the paperboard or paper (1, 5) onto the edge (4) of the the paperboard or paper (1, 5), so that the edges (4) of the two adjacent paperboards or papers (1, 5) are attached abuttingly together via the least one separate profile (3) and the at least one separate profile (3) is sealed on both sides of the abutment of the edges (4) by means of ultrasound,
• the at least one separate profile (3) is sealed onto at least one edge (4) of the paperboard or paper (1, 5) so that the least one separate profile (3) forms a loose bag around the at least one edge (4) with a space being left between the at least one edge (4) and the least one separate profile (3),
• the least one separate profile (3) is pressed by a guide (10) against the at least one edge (4) to form a desired shape, and then
• the edges (4) are attached and sealed abuttingly together each other by ultrasound, so that the edges (4) of the paperboards or papers (1, 5) are separately protected by the least one separate profile (3).