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ENGINEERING JOURNAL CHIANG MAI UNIVERSITY


Volume 25, No. 02, Month AUGUST, Year 2018, Pages 44 - 54


Oversize defect reduction in fritted glazes process

Pichaya Ponrit and Jeerapat Ngaoprasertwong


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The fritted glaze process with water cooling method has been studied. The main objective was to reduce the oversize defect at 50% via frit conveyer machine. This research applies the Six Sigma process in order to better develop the process of producing fritted glazes. The research started from studying the problem, identifying the goal, outlining the parameters of improvement, and analyzing the assessment tool. A brainstorming session was initially needed to identify what potential factors cause the frit to be larger than the standard size. Three tools were used to help find these factors including the Cause and Effect Diagram, Cause and Effect Matrix and Failure Mode Effective Analysis (FMEA). Following that, the hypothesized factors were used to design the experiment in order to find the real root cause of the problem, through the 2k factorial design method. The significant factors were tested the parameter level and were afterward confirmed the results. The research showed that the optimum conditions were letting water into machine from top pipes, side pipes, and small pipes (Y4), width of brick furrow 4 centimeter and frequency of inverter at 37 Hz. The production of oversize frit reduced from 7.69% to 2.78% at 95% confident level which is translated into a reduction at 65.08%.


Keywords

Fritted Glazes, Ceramic Glazes, Six Sigma, Design of Experiments



ENGINEERING JOURNAL CHIANG MAI UNIVERSITY


Published by : Faculty of Engineering Chiang Mai University
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