This paper is the third report that aims at developing translucent vacuum insulation panels (TVIPs) to contribute retrofitting insulation for windows. In this paper, the authors constructed an apparatus applying the pressure-rate-of-rise method to establish a manufacturing process that suppresses pressure increase after sealing TVIP. As the result, 31 conditions that can be suppressed to less than 1 Pa at 30 minutes after stopping vacuuming were obtained. After estimating the additional costs, it would be better to prioritize extending the heating and vacuuming times rather than adding getter agents. Finally, the TVIPs were produced in the process that suppresses pressure increase and measured its thermal conductivity. As a result, the thermal conductivities of the vacuum layers were reduced to less than 0.011 W/(m·K), which is the lowest value in previous study.
