VACUUM HEAT INSULATION MATERIAL, HEAT INSULATION BOX COMPRISING SAME, AND METHOD FOR MANUFACTURING VACUUM HEAT INSULATION MATERIAL

摘要

This vacuum heat insulation material is characterised by comprising: a core material (2) which includes inorganic fibres; a first laminate film (4a) which has a first thermal welding layer (5a) on the inner surface thereof; and a second laminate film (4b) which has a second thermal welding layer (5b) on the inner surface thereof, and by the density of the first thermal welding layer (5a) being less than the density of the second thermal welding layer (5b).