Emplex bag sealers, like the 6100, 6140, 7100, or Fusion 5 Hot Air Sealer can be easily equipped with a modular bag top coder.  Both the Emboss & Markem Touch-Dry^® Ink Coders mount on the bag sealer's discharge end.  They use a speed synchronized coder wheel to imprint up to 23 characters per line x 3 lines.  Your code can be embossed into the plastic bag or printed using Markem's instantly-drying, heat-activated, black ink.