An Effect of Screw Extrusion Parameters On a Pottery Model Forming by A Clay Printing Machine

Abstract

This study presents the development of a clay printing machine based on the screw-based extrusion technique in which the clay is extruded through a circular nozzle to form clay model layer by layer. The developed machine consists of a material container for delivering system, a screw extruder for extruding clay through a circular nozzle and movement system.Traditionally, pottery models are formed by using paster mold or hand throwing, which require experience and proficient workers to form the complex pottery models. Therefore, the clay printing machine has been developed to improve pottery manually fabrication to automatic construction. To investigate a capability material deposition of the clay printing machine, the screw is the key component of an extruder that is the recommended choice for extrudability. The screw extrusion and machine parameters that effect on the appearance of clay filament were studies to find the optimal conditions of the machine. Analysis of variance (ANOVA) is used to analyze main effect parameters. The experimental results shown that the 6 mm nozzle diameter, 19 mm/s screw extruder velocity and 24 mm screw pitch were printing parameters for providing an appropriate appearance of clay filament. A mathematical model was formulated to propose the relationship between response and main effects with their interactions.