Molding tool for manufacturing a lid made of fiber-containing material, lid and molded part made of fiber-containing material

Abstract

A molding tool is described for manufacturing a lid made of a fiber-containing material, a lid, and a molded part made of a fiber-containing material, wherein the design of the lid and of the molded part provides protection against leakage of liquids, etc., in a simple manner.

1 . A molding tool for manufacturing a lid made of a fiber-containing material, having at least one mold cavity bounded by at least two tool parts movable relative to one another, wherein the at least one mold cavity in a closed state forms at least one cavity for a lid to be manufactured, wherein at least one of the tool parts has at least one groove on a molding surface of the at least one mold cavity, wherein the at least one groove extends at least partially over the molding surface of the tool part in the molding direction of the at least two tool parts. 
     
     
         2 . The molding tool according to  claim 1 , wherein the at least one groove forms a closed, substantially circular path. 
     
     
         3 . The molding tool according to  claim 1 , wherein the at least one groove has a transition radius in a transition to the molding surface. 
     
     
         4 . The molding tool according to  claim 3 , wherein the transition radius is between 0.1 mm and 3 mm. 
     
     
         5 . The molding tool according to  claim 1 , wherein the at least one groove has a substantially semicircular cross-section. 
     
     
         6 . The molding tool according to  claim 5 , wherein a radius of the substantially semicircular cross-section has a radius of 0.5 mm to 5 mm. 
     
     
         7 . The molding tool according to  claim 1 , wherein the at least one mold cavity in a region of the at least one groove has no undercut and/or is not designed as a mold cavity for forming an undercut. 
     
     
         8 . A lid made of a fiber-containing material, having an edge that has a locking portion for locking onto a container wall, and a side portion that is connected to the edge at a first region via a transition surface, wherein the side portion is connected to a closing lid surface at a second region,
 wherein the edge and the side portion have a different orientation with respect to the lid surface or the transition surface, wherein the lid includes at least one sealing lip running on an inner side of the lid in a region of the transition surface, wherein the at least one sealing lid is aligned concentrically to an axis running orthogonally through the lid surface and provides an additional holder with respect to the locking portion, wherein the at least one sealing lip and the locking portion are arranged opposite one another so as to come into contact with a container wall in a region of a container edge on opposite sides of the container wall.   
     
     
         9 . The lid according to  claim 8 , wherein the locking portion and the at least one sealing lip are aligned substantially parallel to each other. 
     
     
         10 . The lid according to  claim 8 , wherein the at least one sealing lip is formed as a material addition and the opposite portion of the transition surface on an outer side of the lid is formed flat. 
     
     
         11 . A molded part made of a fiber-containing material, having an edge that has a locking portion for locking on a container edge of a container, and a lid surface, wherein the edge has a locking portion in a transition to the lid surface and the locking portion has an undercut, wherein the edge has a different orientation compared to the lid surface,
 wherein the molded part includes at least one sealing lip running on an inner side of the molded part in a region of the lid surface, which is aligned concentrically with an axis running orthogonally through the lid surface and provides an additional holder relative to the locking portion, wherein the at least one sealing lip and the locking portion are arranged in such a way as to come into contact with a container edge at least on substantially opposite sides.   
     
     
         12 . The molded part according to  claim 11 , wherein a longitudinal extension of the at least one sealing lip from inside substantially corresponds to a radius of the undercut. 
     
     
         13 . The molded part according to  claim 11 , wherein a longitudinal extension of the at least one sealing lip from inside corresponds substantially to twice a radius of the undercut. 
     
     
         14 . The molded part according to  claim 11 , wherein the at least one sealing lip forms an extension of a receiving groove formed by the undercut.