Lid Made of Paper and Method for its Manufacture

Abstract

A lid made of paper and a method for its manufacture, comprising a lid disk and a lid ring having a longitudinal axis and a circumferential wall extending in the direction of the longitudinal axis and having an inner surface and an outer surface as well as a first end and a second end. The outer circumference of the lid ring has a U-shaped region with a first wall section and a second wall section, which are connected to one another via a third wall section. The lid ring has a U-shaped region with a first wall section and a second wall section connected to each other via a third wall section. The lid ring engages with its first end in the U-shaped region of the lid disk such that the first wall section rests against the inner surface and the second wall section rests against the outer surface.

1 . A lid (D) made of paper, comprising a lid disk ( 1 ) and a lid ring ( 2 ) having a longitudinal axis (L 2 ) and a circumferential wall ( 3 ) extending in the direction of the longitudinal axis (L 2 ) and having an inner surface ( 3 A) and an outer surface ( 3 B) as well as a first end ( 3 C) and a second end ( 3 D), wherein the lid disk ( 1 ) and the lid ring ( 2 ) are joined to one another in a materially bonded manner, characterized in that
 the lid disk ( 1 ) has a flat region ( 1 . 1 ) extending transversely with respect to the longitudinal axis (L 2 ), and   has, on its outer circumference, a U-shaped region ( 1 . 2 ) adjoining the flat region and having a first wall section ( 1 . 3 ) and a second wall section ( 1 . 4 ) which are connected to one another via a third wall section ( 1 . 5 ), and   wherein the lid ring ( 2 ) engages with its first end ( 3 C) in the U-shaped region ( 1 . 2 ) of the lid disk ( 1 ) in such a way that the first wall section ( 1 . 3 ) rests against the inner surface ( 3 A) and the second wall section ( 1 . 4 ) rests against the outer surface ( 3 B), and in that the first wall section ( 1 . 3 ) and the second wall section ( 1 . 4 ) of the U-shaped region ( 1 . 2 ) of the lid disk are connected to the first end ( 3   c ) of the lid ring ( 2 ) by a material bond.   
     
     
         2 . The lid according to  claim 1 , characterized in that the wall ( 3 ) is retracted inwardly in the direction of the longitudinal axis (L 2 ) in its region that engages in the U-shaped region ( 1 . 2 ) of the lid disk ( 1 ), thereby forming a shoulder ( 3 . 1 ) below the lid disk. 
     
     
         3 . The lid according to  claim 1 , characterized in that the outer diameter (D 1 ) of the lid disk ( 1 ) is smaller than the inner diameter (d 3 ) of the wall ( 3 ) of the lid ring ( 2 ) in the region of the second end  3 D. 
     
     
         4 . The lid according to  claim 1 , characterized in that it is stackable, wherein the inner diameter (d 3 ) of a lid (D) engages over the outer diameter (D 1 ) of a lid (D) located below it and the second end ( 3 C) rests on the shoulder ( 3 . 1 ) of the lid (D) located below it. 
     
     
         5 . A method for producing a lid (D) according to  claim 1 , characterized in that first a pre-drawn conical lid disk ( 2 ) is produced, which has an edge region ( 4 ) and a flat region ( 1 . 1 ) which is offset thereto by a conical shoulder ( 5 ), in that a lid ring ( 2 ) with a first end ( 3 C) of a wall ( 3 ) is positioned at the outer circumference of the conical shoulder ( 5 ) or inside the conical shoulder ( 5 ), and in that subsequently at least a portion of the conical shoulder ( 5 ) is formed against an inner surface  3 A and the edge region ( 4 ) is formed against an outer surface ( 3 B) of the wall ( 3 ) of the lid ring ( 1 ) and sealed thereto. 
     
     
         6 . The method according to  claim 5 , characterized in that the wall ( 3 ) of the lid ring ( 1 ) is retracted in the direction of the longitudinal axis (A) of the lid ring ( 1 ) when connecting to the lid disk ( 2 ), or in that the wall of the lid ring ( 1 ) is retracted in the direction of the longitudinal axis (A) at a first end ( 3   c ) before or after connecting to the lid disk ( 2 ).