| 摘要 |
PROBLEM TO BE SOLVED: To ensure the excellent sealability even in a severe heat treatment process in a heat resistant plastic cap of three-side seal structure, and to obtain the high inverted sterilizing effect to reliably sterilize up to a tip of a bottle mouth through the inverted sterilization. SOLUTION: The plastic cap has an outer side seal portion 11 in contact with an outer side of the bottle tip 16 of a plastic bottle, a top side seal portion 12 in contact with a top side thereof, and an inner side seal portion 13 in contact with an inner side thereof, a clearance 15 is formed between the inner side seal portion 13 and the inner side of the bottle mouth tip, and the inner side of the bottle mouth tip is sealed by contracting the bottle mouth tip during the sterilization. At least one seal portion of the outer side seal portion, the top side seal portion and the inner side seal portion is formed of a liner, and the other seal portions are formed of the same material as that of a cap shell. |
