Continuous Ink Jet (CIJ) nozzle orifices are mostly made out of synthetic sapphire or ruby jewels. Some CIJ printer manufacturers use stainless steel micro electro-discharged (Micro EDM) drilled stainless steel foils to make nozzle orifices instead of using jewels. Both type of nozzle orifices have advantages and disadvantages

1. Orifice design, geometry, shape, form and surface finish
Manufacture method and quality
Material specifications
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Requirements on continuous ink jet (CIJ) nozzles

2. Continuous Ink Jet (CIJ) nozzle orifices are mostly made out of synthetic sapphire or
ruby jewels. Some CIJ printer manufacturers use stainless steel micro electro-discharged
(Micro EDM) drilled stainless steel foils to make nozzle orifices instead of using jewels.
Both type of nozzle orifices have advantages and disadvantages.
1. Nozzles made out of jewels are extremely hard, robust, durable and cannot get
damaged during use no matter how these are handled. They are chemically
inert. They do not get scratched, erode or corrode during use. Their shape and
surface finish remains unchanged during use. They have extremely long life
2. Micro EDM nozzles are consistent. One nozzle is practically the same as another.
Therefore, jet direction is the same from one nozzle to another. As a result, micro
EDM nozzles do not usually require the provision of a jet alignment mechanism
in the printhead. Micro EDM nozzles are mostly, if not exclusively, made in-house
by the ink jet OEM.
Continuous Ink Jet (CIJ) Nozzles
Nozzle Orifice Manufacture
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3. Is there a difference between sapphire (white) and
Ruby (red) ink jet nozzles regarding overall ink jet
performance? The answer is no. Absolutely not.
What is important in both of these type of nozzles is
the quality of the jewel material, the design, shape,
geometry and surface finish of the jewel.
Continuous Ink Jet (CIJ) Nozzles
Nozzle Orifice Material specifications
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4. In the first instance, whether sapphire or ruby the material must be totally free
from porosity. The design, geometry, shape, form and surface finish are
specifications chosen/set by the ink jet manufacturer designers and engineers.
Achievement of these requirements to the ink jet designers’ drawings depends
on the nozzle jewel supplier’s manufacturing techniques and quality.
Sellenis engineers have the expertise and the know how in this field. This
ensures that Sellenis nozzles incorporate the best ink jet nozzle jewel design
with the optimum geometry, shape and surface finish to give clean jet auto
start/stop and overall high ink jet performance.
Continuous Ink Jet (CIJ) Nozzles
Nozzle Orifice Design Specifications
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