A multiple cell window covering having a fold and a tab is constructed using a strip of fabric as the input, which is then folded, welded, prepared with adhesive, stacked, and cured in an oven. The apparatus used to construct double, triple, and multi-cell honeycomb products includes a folder, ultrasonic...http://www.google.es/patents/US6527895?utm_source=gb-gplus-sharePatente US6527895 - Method and apparatus for making a cellular structure
Method and apparatus for making a cellular structure
