Vacuum insulation material including an inner bag, and method for manufacturing same
The present invention relates to a vacuum insulation material including an inner bag and to a method for manufacturing same. The method for manufacturing the vacuum insulation material includes: a step of manufacturing a core material; a step of compressing and packing the entire surface of the core material using an inner bag made of a breathable film material; a step of disposing a getter on the upper portion of the inner bag; and a step of vacuum-packing a covering material on the upper portion of the inner bag. The inner bag is made of polypropylene (PP), polyester (PET), and/or polyethylene. Since the inner bag is manufactured using a breathable film having fine holes, the method for manufacturing the vacuum insulation material may have improved efficiency, and the vacuum insulation material may be improved in terms of the long-term durability and vacuum insulation properties thereof.
1. A vacuum insulation material comprising:
an inner bag made of an air-permeable film and compressing and packing a surface of a core material;
a cover material disposed on the inner bag through vacuum packing; and
a getter inserted between the inner bag and the cover material,
wherein the core material includes a glass wool,
wherein the inner bag is an air-permeable film formed of at least one of polypropylene (PP), polyester (PET) and polyethylene (PE), and comprising fine holes,
wherein the fine holes having a diameter of 0.1˜10 μm, and
the fine holes of the air-permeable film occupy 30˜90% of an overall surface area of the air-permeable film.
2. The vacuum insulation material according to claim 1 , wherein the core material has a thickness of 20˜40 mm.
3. The vacuum insulation material according to claim 2 , wherein the core material has a thermal conductivity of 2.0 mW/mK or less.
4. The vacuum insulation material according to claim 1 , wherein the cover material has a laminate structure formed by stacking a surface protective layer, a metal barrier layer and an adhesive layer.
5. The vacuum insulation material according to claim 4 , wherein the metal barrier layer comprises an Al foil.
6. The vacuum insulation material according to claim 1 , wherein the getter comprises quicklime (CaO) powder having a purity of 95% or more.