MANUFACTURING METHOD FOR POLYGONAL LID

PROBLEM TO BE SOLVED: To propose a method for forming a polygonal cover lid by using a face member of paper and a paper tube ring. SOLUTION: A paper tube ring R with a circular cross section is formed into a polygon using a metal mold. A face member is cut or punched into a form corresponding to the...

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1. Verfasser: OISHI TAKEO
Format: Patent
Sprache:eng
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Zusammenfassung:PROBLEM TO BE SOLVED: To propose a method for forming a polygonal cover lid by using a face member of paper and a paper tube ring. SOLUTION: A paper tube ring R with a circular cross section is formed into a polygon using a metal mold. A face member is cut or punched into a form corresponding to the polygonal ring R to form a polygonal face member. Thereafter, a periphery of the polygonal face member is drawn to form a fitting rim D2. Subsequently, the face member is inserted into the polygonal ring R, and an outer peripheral surface of the fitting rim D2 of the face member is glued with the upper end of the ring R.