Research on a semi-automatic sample applicator

In this paper a semi-automatic sample applicator made in an ordinary laboratory without help from others is described in detail. All the components of the applicator are available commercially at low cost and the process of assembly of the applicator is very simple and practical, especially the spraying head and the applicator mechanism. Factors that could affect the function of the applicator, for example the type and position of the spraying head, the gas pressure, and the application speed were tested. The type and position of the spraying head have a discernible effect whereas gas pressure does not. The relative standard deviation of band length and band width are <1% and <2.5%, respectively. The errors mainly arise from the clearance of the screw used for transmission of the shaft. The mechanism of the processes affecting band uniformity were researched and are described in detail. The application speed is an important factor, the faster the application speed, the better.