A method of producing a packaging material

摘要

A method of producing a packaging laminate ( 10 ) in which a web is provided with through-going holes ( 2 ) which are covered on one side with a first outer layer ( 3 ) on the one side of the web and with a second outer layer ( 4 ) on the other side of the web in such a manner that the first and second outer layers ( 3 and 4 ) are permanently sealed to one another within the regions of the opening contour of the through-going holes. In order to ensure the permanent seal between the two outer layers ( 3 and 4 ), the web is subjected, after application of the first outer layer but prior to application of the second outer layer, to so-called flame-treating whereby accessible parts of the first outer layer within the regions of the through-going holes ( 2 ) are activated or polarized by means of one or more gas flames directed at the other side of the web.