FORMATION OF LOWER CYLINDRICAL MOUTH BODY OF INSIDE AND OUTSIDE BOTTLE BODIES CONSTITUTING LOWER OPENING OF DOUBLE-MOUTHED DOUBLE-LAYERED BOTTLE

摘要

PURPOSE:To assure thoroughly the wall thickness of a titled lower cylindrical mouth body so that the length thereof can be made long by combining respective stages for forming a bowl- shaped projecting part, forming a bottomed cylindrical body and removing the top end of said cylindrical body in such a way as to make specific action. CONSTITUTION:A bowl-shaped projecting part which has a relatively small depth and a relatively large diameter as compared to the final diameter of a lower cylindrical mouth body to be formed and has the wall thickness T2 approximately equal to the wall thickness T1 in the outside circumferential part 31a of the base 31 of the bottle body is formed in the central part of said part 31 in the stage of blow molding of a bottle body 30. While the part 41 is heated, the projecting part is drawn in the central direction thereof to form a bottomed cylindrical part 42 having a small diameter and a long length. The top end 42a of the part 42 is then cut off. If the lower cylindrical mouth body can be made long while the substantial wall thickness of the lower cylindrical mouth body is formed according to the above-mentioned method, the length of the lower cylindrical mouth body is assured and the connection of a passage pipe for feeding liquid, etc. to the lower opening of the double-mouthed double-lauered bottole is made easy and sure.