Process for making windowed form, fill and seal bags

A method of making windowed bags comprising the steps of:

• linearly conveying an endless strip of flexible, substantially opaque, paper-like material having a print side for receiving printed indicia and an adhesive side for receiving adhesive, said endless strip of flexible paper-like material comprising individual bag-forms attached side-to-side, each having a window area and each to be used for making a windowed bag;
• applying at an adhesive-application station an adhesive to substantially said entire adhesive side, with an exception of the window area of each of said individual bag forms to which adhesive is not applied;
• cutting at a synchronized window-cutting station having a cutter whose operation is synchronized to positions of the window areas a window blank at each window area so as to form a window opening therein;
• laminating an endless strip of transparent heat-sealable film to said adhesive side of said endless strip of flexible paper-like material with said adhesive to thereby form said composite endless form for being cut into said individual bag forms having edges and heat sealed at the edges thereof for making individual, windowed, form, fill and seal bags;
• cutting said composite endless form into said individual bag forms having edges;
• folding said individual bag forms so that said heat-sealable film is in contact at edges of said individual bag forms;
• and
• filling pouches formed by said individual bag forms;
• and
• applying heat to said edges to seal said edges and thereby said material in said pouches.