IT1129231B - Open cardboard drum prodn.
- Google Patents
Open cardboard drum prodn.
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Publication number
IT1129231B
IT1129231BIT68210/80AIT6821080AIT1129231BIT 1129231 BIT1129231 BIT 1129231BIT 68210/80 AIT68210/80 AIT 68210/80AIT 6821080 AIT6821080 AIT 6821080AIT 1129231 BIT1129231 BIT 1129231B
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Application filed by Rudolf GorigfiledCriticalRudolf Gorig
Priority to IT68210/80ApriorityCriticalpatent/IT1129231B/en
Publication of IT8068210A0publicationCriticalpatent/IT8068210A0/en
Application grantedgrantedCritical
Publication of IT1129231BpublicationCriticalpatent/IT1129231B/en
The method produces drum-type vessels, open at one end of round of polygonal cross-section and of cardboard or corrugated paper. A flat piece of cardboard etc of length corresponding to the vessel circumference is glued along one or both side edges and wrapped round a mandrel and glued together to form a peripheral seam' a pre-shaped base being then inserted in the sleeve so formed and sealed to it. In a number of successive operations the mouth edge is beaded over, while supported on the inside and outside, the first operation turning the edge through 90 deg.' the second for a further 90 deg., and the third rolling it into the final position.