SUPPLY YIELDS FOR DIGITAL DUPLICATOR INK
Supply yields for digital duplicator Ink is a complex issue as compared to copiers.
With copiers a certain amount of toner is applied to the paper to create the copy. It can readily be determined based on this amount how many copies may be obtained from a bottle or cartridge.
Digital duplicating machines are different. For example using a 1,000cc cartridge of Riso ink, copy yields could range from 5,000 to 20,000 copies. Several factors must be considered in assessing this yield. It is important to look at the amount of ink used on the paper or, the density of the copy. Another factor is the coverage of the page (percent of coverage). Both these factors require different amounts of ink depending on how dark the exposure is set and how much of the page is covered. However, the most critical factor is the Run Length (the number of copies produced from each master.)
Each time a used master is ejected and placed in the waste receptacle, the remaining ink on the master is wasted. This is true regardless of which duplicator you have. There is enough ink left on the back of the master to make hundreds of additional copies. If you have not had the opportunity to see a machine in operation please take the next opportunity to review one. Be sure to check the waste receptacle of the machine and note how much ink is on the backside of the master. This is what reduces your ink yield. Please note, this is not limited to any one machine, Riso, Ricoh, Savin, Gestetner, Lanier, Standard or Duplo, all use the same process.
When comparing different inks remember all digital duplicators will provide the same ink yields. The same amount of ink will be used at the same density provided it is the same original. Some paper may be more absorbent and may pull more ink out of the cylinder but this is minor in evaluating yields. Some machines use 9" wide masters and others use 12 " wide. The wider the material the higher the ink loss when the master is removed.
An effective way to provide an accurate comparison for the cost of ink is to compare the cost of one unit. As an example most Ricoh, (Gestetner, Savin, Standard) and Duplo machines use a 600ml cartridge. While most Riso ink cartridges are 1000ml. The unit does not matter; you can just compare the cost of a unit.
In conclusion, remember that the number of copies provided by a cartridge of ink depends on several factors. Size of the cartridge, density of copy, percent of coverage and most importantly run length. No one can guarantee a set number of copies per cartridge because of these factors. If a guarantee of ink yield is made, make sure you get it in writing. Plus be sure to monitor your ink consumption and obtain free ink if the yield is not as promised.
Information provided by American Coated Products, Inc.
Please note, Gestetner, Savin, Standard and Lanier duplicators are all manufactured by Rioch Corporation and therefore use the same and/or similar supplies. Riso ink is only compatible with Riso (Risograph) models.