SATA News


01.06.2015

Frequently asked questions

Material consumption

As spray gun manufacturer, SATA are often asked about the correct meaning and interpretation of the terms “material consumption“ or “transfer efficiency”. What is the actual difference between material/fluid delivery rate, Transfer Efficiency-> transfer rate  X» and material consumption? These terms are often misunderstood and misinterpreted – so let us take a closer look.

Material delivery rate
The material delivery rate describes the amount of material (paint) which in a defined period of time is released from the material passage – in actual fact from the fluid tip of the spray gun – at a defined dynamic gun Inlet PressureThe inlet pressure on the spray gun should always be correctly adjusted. This is particularly easy with the DIGITAL technology of the SATAjet 5000 DIGITAL or with the retrofit SATA adam 2. It is also possible, however, to connect a standard air micrometer with manometer to the gun. Since pressure in combination with the supply of compressed air (air consumption) has a great influence on optimum results, you should always ensure to set the inlet pressure as recommended. You will find information on the correct pressure to be used in the paint application sheet of the paint manufacturers or on the web pages reserved for each individual SATA spray gun.X» and with the gun trigger being fully pulled. This rate is measured in grams per minute (g/min). The actual material delivery rate is effectively dependent on the size of the nozzle system (i.e. fluid tip size), the dynamic gun Inlet PressureThe inlet pressure on the spray gun should always be correctly adjusted. This is particularly easy with the DIGITAL technology of the SATAjet 5000 DIGITAL or with the retrofit SATA adam 2. It is also possible, however, to connect a standard air micrometer with manometer to the gun. Since pressure in combination with the supply of compressed air (air consumption) has a great influence on optimum results, you should always ensure to set the inlet pressure as recommended. You will find information on the correct pressure to be used in the paint application sheet of the paint manufacturers or on the web pages reserved for each individual SATA spray gun.X» as well as the ViscosityMaterial viscosity is the time (in seconds) it takes the material to completely flow out of a standardized container. There are different measuring methods available. Please find the corresponding chart attached. X» of the material to be applied.

This means: The higher the dynamic gun Inlet PressureThe inlet pressure on the spray gun should always be correctly adjusted. This is particularly easy with the DIGITAL technology of the SATAjet 5000 DIGITAL or with the retrofit SATA adam 2. It is also possible, however, to connect a standard air micrometer with manometer to the gun. Since pressure in combination with the supply of compressed air (air consumption) has a great influence on optimum results, you should always ensure to set the inlet pressure as recommended. You will find information on the correct pressure to be used in the paint application sheet of the paint manufacturers or on the web pages reserved for each individual SATA spray gun.X», the larger the nozzle size and the higher the specific weight of the material, the higher the material delivery rate.

However, it does not say anything about Transfer Efficiency-> transfer rate  X» or indeed material consumption.

Transfer Efficiency-> transfer rate  X» rate
The Transfer Efficiency-> transfer rate  X» rate defines the amount of paint material released from a spray gun which actually reaches and remains on a flat surface of a defined size (e.g. 1 m²-panel) under a defined set of parameters comprising of dynamic gun Inlet PressureThe inlet pressure on the spray gun should always be correctly adjusted. This is particularly easy with the DIGITAL technology of the SATAjet 5000 DIGITAL or with the retrofit SATA adam 2. It is also possible, however, to connect a standard air micrometer with manometer to the gun. Since pressure in combination with the supply of compressed air (air consumption) has a great influence on optimum results, you should always ensure to set the inlet pressure as recommended. You will find information on the correct pressure to be used in the paint application sheet of the paint manufacturers or on the web pages reserved for each individual SATA spray gun.X», spray distance and spray angle, and with fully pulled gun trigger. Modern-day spray guns, like the HVLPHVLP = High Volume Low Pressure - low spray pressure technology.Terminology for an internationally recognized low-pressure technology whereby the transfer efficiency rate has to exceed 65%, while the maximum air cap pressure is below 0.7 bar.X» and RP RP is an acronym for Reduced Pressure - optimized high pressure spray guns which achieve perfect finishes as well as transfer efficiency rates exceeding 65%. RP spray guns comply with the legislation of the EU VOC directive.   Switching from high pressure technology to RP technology is easily mastered by every painter, as it will allow him to continue working "as before". SATA RP spray guns are therefore also referred to as "Super Speed" spray equipment. X» guns from SATA, reach transfer rate efficiencies well above 65%, as mandated for the collision repair industry by legislation in many countries.

Material consumption
A completely meaningful definition of material consumption is difficult to come up with. In practical terms, the effective material consumption varies depending on the geometry of the object to be painted, the work speed of the painter, the spray distance, the existing dynamic gun Inlet PressureThe inlet pressure on the spray gun should always be correctly adjusted. This is particularly easy with the DIGITAL technology of the SATAjet 5000 DIGITAL or with the retrofit SATA adam 2. It is also possible, however, to connect a standard air micrometer with manometer to the gun. Since pressure in combination with the supply of compressed air (air consumption) has a great influence on optimum results, you should always ensure to set the inlet pressure as recommended. You will find information on the correct pressure to be used in the paint application sheet of the paint manufacturers or on the web pages reserved for each individual SATA spray gun.X» as well as the required film thickness.

If we paint, for example, a bike frame (with a surface of approx. 1m²) and in comparison a 1m²-panel with the same spray gun used with identical application parameters, everyone will expect a much higher material consumption in the case of the bike frame, despite the fact that we are operating with the same Transfer Efficiency-> transfer rate  X» and the same material delivery rate.

Conclusion:
The above explanations clearly prove that mere considerations of individual parameters, as for instance the often cited Transfer Efficiency-> transfer rate  X», do not provide any practical guidelines for the daily work of the painter. With this in mind, the recommendations of the paint manufacturers should be always strictly observed.