Thermal insulating unit for vacuum-packaging micropowder materials

摘要: A thermal insulating unit includes a sealed inner gas-permeable bag containing an micropowdered material, such having two major surfaces parallel to each other. Two multilayer sheets are respectively disposed on opposite sides of the and overlap same, sheet being formed innermost layer outermost thermoweldable plastic intermediate metal layer. The has smaller dimensions than layers that wholly covers only its corresponding inner-bag surface. four peripherally heat-sealed, resulting outer been evacuated. device is provided for fixing positioning it with respect respective layers.