# An Analysis of the Process of Applying Technical Lubricating Coatings
## 3 Results  
In Figures 3 and 4, the widths of the sprayed grease for a nozzle of different construction and greases of different consistency are graphically compared. It can be seen that, at low atomization pressures, there are inhomogeneities in the structure of the sprayed layers. Its edge is not uniform. Sometimes, instead of a layer of material, drops of material of varying diameters are applied--the lower the atomization pressure, the larger the diameter of the drops applied to the substrate. The images presented in Figures 3 and 4 show droplets (systems AI, AII, and BI; pressure 20 psi), indicating the insufficient coverage of the material surface with lubricant, which can contribute to its wear. For system AI, droplet coverage of the surface was also observed at higher pressure values, up to around 50 psi. Surface coverage for system AII is acceptable at pressures from 30 psi, but only fully satisfactory at around 50 psi. Systems BI and BII are acceptable for pressures greater than 30 psi. Systems BI and BII have a narrower path compared to systems AI and AII. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Designation** & **Nozzle** & **Lubricant** & **Temperature of Air (\({}^{\circ}\)C)** & **Humidity of Air (\%)** &
\begin{tabular}{c} **Pressure of** \\ **Lubricant (psi)** \\ \end{tabular} \\ \hline AI & Nordson EFD & No I & 20.9 & 38.6 & 40.0 \\ AII & 7856F–465S 0.046\({}^{\prime\prime}\) & No II & 21.0 & 38.3 & 14.5 \\ \hline BI & Nordson EFD & No I & 20.8 & 33.9 & 15.05 \\ BII & 7856–465S 0.046\({}^{\prime\prime}\) & No II & 20.8 & 34.4 & 14.5 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: The measurements series (A = nozzle with flat spray, B = nozzle with full cone spray). Figure 4: Graphical comparison of the width of the sprayed lubricant coatings in each of the measurement series after the analysis in the Image-Pro Plus program—the pseudo-color was used (**A**) = nozzle with flat spray, (**B**) = nozzle with full cone spray, I = lubricant No I, II = lubricant No II. Figure 3: Graphical comparison of the width of the sprayed lubricant coatings (**A**) = nozzle with flat spray, (**B**) = nozzle with full cone spray, I = lubricant No I, II = lubricant No II. After transforming the images in the Image-Pro Plus program, it is possible to evaluate the thickness of the lubricant layer applied to the base material. Of course, this is a simplified relationship between shades of gray vs. lubricant layer thickness. The color red indicates areas where a thicker lubricant layer has appeared. It is particularly visible in the case of system AI, which is characterized by the formation of droplets or a thicker layer along the axis of the nozzle. In Figures 5 and 6, the relationship between the obtained width of the spray path and the variable atomization pressure is shown. In Figure 5, the relationship of the width of the spray path vs. pressure for nozzle Nordson EFD 7856F-46 SS 0.046\" with a flat spray is shown, and in Figure 6, the relationship for nozzle Nordson EFD 7856-46 SS 0.046\" with a full cone spray is shown. The letters A and B indicate the type of nozzle used. Roman numerals indicate the type of lubricant used: I is lubricant No. I classified in the 2 nd class according to NLGI, and II is lubricant No. II classified in the 0 th class according to NLGI. spray nozzle. Using the given values of atomization pressure, when using the two nozzles interchangeably, a spray width of 9 to 37 (mm) can be obtained. The most extreme results regarding the width of the material path were obtained when using lubricant No. I. Both lubricant No. I and lubricant No. II, despite being classified into different consistency classes according to NLGI, allowed for the creation of a lubricating layer with a varied width and in some cases with a similar value. However, every time the nozzle is replaced using a time-pressure valve, it is necessary to check whether the material dose is the same and is 7.5 (g/min).