| 摘要 |
PROBLEM TO BE SOLVED: To prevent the liquefied oxygen-absorber from leaking out through a covering film, by fitting the oxygen-absorber covering an oxygen-absorptive substance with a vapor-permeable non-porous film, in the cap body through an air-permeable fitting part. SOLUTION: An oxygen-absorber A in which a powdery or granular oxygen- absorptive substance 1 is hermetically sealed and packaged is charged in a cap body C through a fitting part B provided with air holes 4a at the underface 4, with a vapor-permeable non-porous film 2. An air-permeable sheet 8 like a porous film or sheet can be put on the air holes-part of the fitting part B when necessary. It is preferable to use a film which has a vapor-permeability of 1500-6000g/m<2> day and does not bring the deterioration of physical properties at the nearby position of the upper limit temperature of 80 deg.C, as the vapor- permeable non-porous film 2. A mixture of gallic acid and sodium carbonate at the weight ratio 1:1 is used for the oxygen-absorptive substance. |
