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    :: what are ink jet printers? ::   :: two basic types of ink jet ::    
    ink jet printers are a means of printing whereby the printer itself has no physical contact with the surface on which it is printing. hence, the term ink jet, since a jet of ink is projected out of the printhead though free air onto the surface to be printed.   ink jet coding falls into two main types; "Drop on Demand" (DOD) and the other being "Continuous Ink Jet" (CIJ). both of these units produce a dot matrix format print type. the dot matrix format to create each character can be as little as 5 drops high by 5 wide, up to 21 drops high by 16 wide. the more drops per character, the better resolution it would be.    
        "Drop on Demand" (DOD) printers    
    all types of industries rely upon product marking, coding, dating and identification and until the advent of ink jet coding, much of this printing was done by other less efficient methods, or in fact, was not done at all.   this system consist of a pressurized pot of ink which is connected to each nozzle via a manifold and solenoid. the solenoid is control by electronics to produce an open-and-close situation to allow droplets of ink to be projected at the appropriate time.    
        "Continuous Ink Jet" (CIJ) printers    
    ink jet coding had been a boon in many production environments with its ability to code on various shaped and textured surfaces without contact. Thus, enabling products to be identified, batch coded or dated and enhancing both production control and quality assurance.   mostly used for small character applications. this system incorporates quite complex microprocessors to control both ink viscosity, ink flow and the actual printing itself. the inks and the control of their viscosity are extremely important factors which contribute to both the quality of print and the serviceability of the printer. specialize inks are manufactured under stringent quality control conditions.    
             
    :: advantages of ink jet coding ::   : non packaging application ::    
    zero contact between printhead and print surface allows for products on high speed production lines to be coded without disrupting the conveyor system. most significant advantage of ink jet coding is the ability to change print-out information without stopping product line. this information can be varied from product to product, that is with each product being individually numbered using the "serialiser" or alternatively the internal clock updating and printing the time of day on each product.   ink jet printing has developed considerably and now there are multiple printhead units which are commonly termed Graphic Systems. these systems are used within the printing industry and others where specialist applications are proving to be more effective. example, numbering of lottery tickets, numbering of airline tickets, numbering of consignment notes and etc. graphic applications also provide for variable information printing, such as, addressing application on envelope.    
             
    other printing methods require product to have a flat and even surface to be able to print. however, ink jet printers can print on variable surfaces whether they be flat, undulating, rough or curved.   new applications are found, of which the cable marking industry is another example. electrical cable is marked with not only the manufacturer, also its size, grade, quality, measurement and etc.    
     
     
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