On-site printing usually is employed at or near the place of use. The most generally known barcode print technologies for on-site use are:
- Direct Thermal: Heating materials in the printhead are carefully heated to develop an image by overlapping dots on a heat-sensitive substrate.
- Thermal Transfer: Thermal transfer technology consists of similar printhead as direct thermal, but it consists of a separating ribbon with resin-based or wax-based ink and when it is heated, the image is transferred from the ribbon to the substrate.
- Dot Matrix Impact: A transferring printhead consisting of one or more vertical rows of hammers and generates images by several passes over a ribbon. These passes generate rows of overlapping dots on the substrate to develop an image. Serial dot matrix printers generate images character by character; high-volume dot matrix line printers are used to print complete line in just one pass.
- Ink Jet: This technology consists of a fixed printhead and several small orifices which project small droplets of ink onto a substrate to develop an image made from overlapping dots. Ink jet printers are utilized for in-line primary marking on products or containers.
- Laser (Xerographic): The image is developed on an electrostatically charged, photo-conductive drum with a controlled laser beam. The charged areas will attract toner particles which are transferred and fused onto the substrate.
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