摘要 |
PROBLEM TO BE SOLVED: To provide a packing which is provided at the inside of a lid body for sealing the opening of a container body, where inspection for detecting metals in the contents of a container can be performed and where the permeability of oxygen, carbon dioxide and moisture is low.SOLUTION: A packing includes: a barrier film laminated with a polyester layer and a barrier layer; and a resin foam layer being laminated with the barrier layer in the barrier film and containing a polyolefin having a melting point of 105°C or higher. The barrier layer includes the polymer of the polyvalent metal salt of an unsaturated carboxylic acid compound having a polymerization degree of less than 20 and has a ratio (A/A) of absorbance Abased on &ngr;C=O of a carboxylic acid group in the vicinity of 1,700 cmin an infrared absorption spectrum and the absorbance A based on &ngr;C=O of carboxylate ions in the vicinity of 1,520 cmis 0.10 or less. |