Lid ring

Abstract

A lid ring (7) for sterilizable containers (1) is proposed which is formed from a metal ring (40) coated on both sides with at least one plastic layer (37, 43), a radially outer cut edge and a radially inner flange (31). The radially inner flange (31) is folded back on itself at least once.

1 . A lid ring comprising; a metal ring having two sides, the metal ring being coated on both sides with at least one plastic layer, the metal ring having a radially outer cut edge and a radially inner flange delimited by a cut edge, with a peripheral sealing zone ( 30 ) arranged on the flange characterized in that the radially inner flange is folded back on itself at least once and the fold forming a lid opening is compressed. 
     
     
         2 . The lid ring according to  claim 1 , characterized in that the radially inner flange is folded back on itself at least twice, and the cut edge is enclosed almost substantially air-free by the plastic layers lying on the fold inside. 
     
     
         3 . The lid ring according to  claim 2 , characterized in that a lid ring core wall is formed radially on an outside on the folded radially inner flange with a peripheral sealing zone arranged thereon. 
     
     
         4 . The lid ring according to  claim 3 , characterized in that the radially inner flange is folded back on a side of the flange opposite the sealing zone. 
     
     
         5 . The lid ring according to  claim 1 , characterized in that a metal of the metal ring is selected from the group consisting of steel, tin plate, black plate, aluminium and aluminium alloys. 
     
     
         6 . The lid ring according to  claim 1 , characterized in that a plastic of the plastic layers is selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate and polyamide. 
     
     
         7 . The lid ring according to  claim 1 , characterized in that a plastic layer has a layer thickness of 5 μm to 100 μm. 
     
     
         8 . The lid ring according to  claim 1 , characterized in that a lid film closing a lid opening is sealed onto the sealing zone. 
     
     
         9 . The lid ring according to  claim 8 , characterized in that the lid film is a composite film selected from the group consisting of plastic-coated aluminium, laminated aluminium, painted aluminium and aluminium-free composite films. 
     
     
         10 . The lid ring according to  claim 8 , characterized in that the lid film is a composite film and has an embossing. 
     
     
         11 . The lid ring according to  claim 8 , characterized in that the lid ring is connected to a container body by a fold connection. 
     
     
         12 . A method of producing a lid ring wherein the lid ring includes two sides, a radially cut outer edge and a radially inner flange comprising: single folding the radially inner flange in a radial direction forming a multi-layer flange having a folded region, and wherein after folding, the folded region is also compressed. 
     
     
         13 . The method of producing a lid ring according to  claim 12 , further including coating both sides with a plastic layer, double folding the radially inner flange in the radial direction, forming a multi-layer flange having an inside and the radially cut outer edge is enclosed substantially air-free by the plastic layer lying on the fold inside, and wherein after folding, the folded region is also compressed. 
     
     
         14 . The lid ring according to  claim 8  characterized in that the lid film is a composite film and has a printing.