Method and apparatus for sealing two moving webs of material together, which webs have portions which are non-planar

An apparatus for sealing two moving webs of material together, wherein said webs are moving in a machine direction and said webs have a width, and said webs of material have portions which are non-planar across their width, said apparatus comprising:

• a) a first component having a web-contacting surface configured to contact at least one of the two moving webs the first component having at least one recess in the web-contacting surface;
• b) a second component opposing said first component and having a web-contacting surface configured to contact at least one of the two moving webs, said second component comprising at least one projection that mates with said at least one recess in the web-contacting surface of said first component, the moving webs of material being located between webs of material between the first and second components;
• and
• c) a sealing mechanism located on or proximate to said first and second components, said sealing mechanism being configured to seal portions of said moving webs of material together;
• wherein said at least one projection and said at least one recess are positioned and configured to stretch said two moving webs when said at least one projection mates with said at least one recess, said at least one projection and said at least one recess being configured to not seal together said two moving webs.