Vacuum insulation panel including annealed binderless glass fiber
Disclosed is a vacuum insulation panel having excellent thermal insulation and cold retention performance using conventional glass fibers. The vacuum insulation panel employs annealed binderless glass fibers as a core material, thus ensuring superior thermal insulation performance and preventing out-gassing in a vacuum due to the absence of organic residues in the fibers, and thereby a vacuum level of the vacuum insulation panel can be maintained for a long period of time.
1. A vacuum insulation panel, comprising glass fibers as a core material, a gas adsorbent for adsorbing moisture and gas from an inside of the vacuum insulation panel, and an airtight sealing member for sealing the glass fibers, wherein the glass fibers are annealed binderless glass fibers obtained by annealing binderless glass fibers for a period of time ranging from 0.5 min to less than 20 min using a hot air permeable belt type annealing furnace at 300˜700° C., and wherein the orientation of the glass fibers are uniform.
2. The vacuum insulation panel of claim 1 , wherein the binderless glass fibers have an average fiber diameter of 7 μm or less.
3. The vacuum insulation panel of claim 1 , wherein the annealing furnace is a hot air permeable belt type annealing furnace.
4. The vacuum insulation panel of claim 1 , wherein annealing the binderless glass fibers is performed after laminating the binderless glass fibers in a single layer or two or more layers.
5. The vacuum insulation panel of claim 1 , wherein the airtight sealing member is provided in a multilayer film sequentially comprising:
a first outer layer selected from the group consisting of an inorganic oxide deposited polyethyleneterephthalate (PET) layer, a nylon layer, and a deposited oriented polypropylene (OPP) layer;
a second outer layer selected from the group consisting of an inorganic oxide deposited PET layer, a nylon layer, and a deposited OPP layer;
an aluminum foil layer; and
a polyethylene heat-sealable layer.
6. The vacuum insulation panel of claim 1 , wherein the gas adsorbent comprises calcium oxide; or a mixture of calcium oxide and a metal powder selected from the group consisting of zirconium, manganese, titanium, barium, iron, cobalt, aluminum, nickel, and chromium.
7. The vacuum insulation panel of claim 1 , which has a thermal conductivity of 0.0020 W/mK or less.
8. The vacuum insulation panel of claim 1 , which has a thickness of 5˜50 mm and a final density of 150˜400 kg/m 3 .