Fig. 1. Manufacturing flow chart of porcelain tile

Fig. 2. Photograph of concavity defects at porcelain tile surface

Fig. 3. XRD patterns of APB and NPB blanks

Fig. 4. FTIR spectra of APB and NPB blanks

Fig. 5. TGA-FTIR 3D images of blanks
(a): APB; (b): NPB

Fig. 6. 2D characteristic FTIR spectra of Absorbance-Wave number of gaseous species during thermolysis of blanks
(a): APB; (b): NPB

Fig. 7. 2D characteristic FTIR spectra of absorbance-temperature of gaseous species during thermolysis of blanks
(a): APB; (b): NPB

Fig. 8. Total volume flow of gaseous species during thermolysis of APB and NPB blanks