To obtain a heat insulating molding for reducing the coefficient of thermal conductivity of a heat insulating molding composed of rigid polyurethane foam using a blowing agent substitute and to provide a method for molding the same.
The molding has a minor axis direction as an effective heat insulation direction, the average value of the ratio A/B of the major axis A to the minor axis B of 1.8-2.5 and ≥50% closed cell ratio when cell structure in the rigid polyurethane foam is closely related to an ellipse. The method for producing the heat-insulating molding of the rigid polyurethane foam having closed cells comprises injecting a composition for urethane foam into a void, after foaming, starting compression at a time Ts represented by formula of gel time≤Ts≤125×log10 (gel time) and compressing the void in the effective heat insulation direction until the volume of the void reaches 40-95% of the volume of the composition in foaming when the composition has 100% volume in foaming.
SATO KENICHI
Masayoshi Kanda
Akio Miyao