Packaging for pharmaceuticals, cosmetics, toothpaste, foodstuffs, grease, mastic, adhesive, etc, has projecting nozzle for receiving cap, etc. closed by re-entrant concave wall

摘要

A hollow body has a head fitted with a projecting nozzle for receiving a cap, etc. The nozzle is closed by a re-entrant concave wall shaped like a bowl. Independent claims are included for: (a) Manufacturing the above body by injection molding. The nozzle and concave wall are formed by a groove in the wall of the mold and a coaxial conical surface. (b) Manufacturing the above body in one piece by injection molding as in (a) using a mold with a retractable core. In a first period all the body apart from the convex wall is formed. Subsequent the core is retracted and the convex wall is then formed. Preferred Features: The main part of the body may have a cylindrical, oval or other cross section. The re-entrant wall is a cone with a cone angle of 90 - 170 deg , preferably 130 - 160 deg . The plastic enters the mold either at a central point or at several points arranged around the groove.