| 摘要 |
PROBLEM TO BE SOLVED: To improve the sealing performance of a cap and the top end face of the bottle mouth cylindrical part of a blow molded bottle body provided with an inverted flange at the top end of the mouth cylindrical part. SOLUTION: This bottle body comprises a synthetic resin outer layer 2 forming a fixed shape outer shell, and a flexible synthetic resin inner layer 3 laminated freely peelable on the outer layer 2 and forming an inner bag. In this case, at the top end of a mouth cylindrical part 4 where a cap is screwed on, an inverted flange 5 with the inner layer 3 on the upper face, curved and inverted from the inside to the outside and having an outer diameter not hindering the screw assembly of the cap on the mouth cylindrical part 4 is integrally formed, and at the upper face of the inverted flange, a ring shape packing 10 is fixed as an insert material. |
