PRODUCTION OF HEAT INSULATING MATERIAL

摘要

A method for manufacturing a heat insulating shaped bar including a pair of spaced side walls and a heat insulating connecting portion formed by heat insulating material and connecting the pair of side walls together from an integrally extruded metal shaped bar having the pair of side walls and a connecting wall (or walls) extending and connecting between the side walls is disclosed. The connecting wall(s) includes on one surface thereof a recess having sloped sides and extending longitudinally of the metal shaped bar and the method includes a step of cutting the material of the connecting wall(s) from the other surface at the area of the recess.