Sealing device

摘要

The present invention relates to a sealing device for using heat to form a weld between a first layer of plastic and a second layer of plastic, provided with heating means for heating the layers of plastic and conveyor means for conveying the layers of plastic past the heating means, and separation means for forming a separating layer between the heating means and the layers of plastic while the latter are being heated, the separation means being displaceable in the direction of movement of the layers of plastic past the heating means. The sealing device according to the invention is characterized in that preheating means are provided for the purpose of preheating the separation means before they are fed to the heating means.