| 摘要 |
PURPOSE: To tightly weld a cover to make the cover easily pulled off, by comprising a plastic neck, a cap and a cover weldable on a neck end after the cap is fixed on the neck, and further comprising a projecting portion for pulling the cover off. CONSTITUTION: An end face 4 of a polytene neck 1 of a tube 2 comprises the burrs 5, and a polypropylene cap 8 comprises a shoulder 14. A cover 21 comprises at least two outer layers mainly composed of plastic, and a barrier layer for aroma and oxygen comprising a projecting portion 23 for pulling the welded cover off. The cover 21 is placed on an opening end portion of the cap 8 in a center-matched manner, and pressed to a bottom portion 16 of the cap 8 for assembling. Then the cap 8 is inverted to be screwed on the neck 1 of the tube 2. The cover 21 is grasped between the shoulder 14 of the cap 8 and the end portion 4 of the neck 1, and the cover is induced and welded on the end portion of the neck in this condition. Whereby the tube can be surely sealed, and the cover can be easily removed. |
