of the ribs to support a flexible film the edges of the tab film seal on the underside wall of the cover molding 39 the chip is bonded onto one hundred micron wide ribs that run the length of the micro molding providing a final ink feed to the print nozzles the design of the micro molding allows for a physical overlap of the print chips when they are butted in a line because the printhead chips now form a continuous strip with a generous tolerance they can be adjusted digitally to produce a near perfect print pattern rather than relying on very close toleranced moldings and exotic materials to perform the same function the pitch of the modules is typically 20 33 mm the individual layers of the laminated stack as well as the cover molding 39 and distribution molding can be glued or otherwise bonded together to provide a sealed unit the ink paths can be sealed by a bonded transparent plastic film serving to indicate when inks are in the ink paths so they can be fully capped off when the upper part of the adhesive film is folded over ink charging is then complete the four upper layers 52 56 60 62 of the laminated stack 36 have aligned air holes 54 which communicate with air passages 63 formed as channels formed in the bottom surface of the fourth layer 62 as shown in fig9 b and 13 these passages provide pressurised air to the space between the print chip surface and the nozzle guard 43 whilst the printer is in operation air from this pressurised zone.