Rotary closure with liner for a container

Abstract

The invention concerns a rotary closure especially for medication bottles, which has a rotary cap, in which a liner that closes the opening is provided. The liner has at least two layers, which contact each other along a contact surface; the upper layer initially lies in the rotary cap and is joined to it at least in the central part of the face and the lower layer is firmly joined to the annular face of the opening and the liner has a weakening line ( 4 ). In order to achieve simple and clean opening, it is prescribed that the weakening line ( 4 ) is closed and leads around the central part ( 3 ) of the face and that in the area of the contact surface within the weakening line ( 4 ) joining of the two layers is strong and outside the weakening line ( 4 ) it is not present or only weak.

1 - 8 . (canceled) 
     
     
         9 . A liner for a rotary closure, comprising:
 at least an upper multilayer and a lower multilayer joined to each other along a contact surface;   wherein the liner incorporates a closed weakening line disposed around the contact surface, and the liner is configured so that along the contact surface the connection between the upper multilayer and the lower multilayer is strong, and outside the weakening line the connection between the upper multilayer and the lower multilayer is substantially weaker.   
     
     
         10 . The liner of  claim 9 , wherein the upper multilayer is configured to be attached to at least a central part of a circular inner face of a rotary cap of the rotary closure; and
 the lower multilayer is configured to be firmly joined to an annular face of a container opening that can be sealed by the rotary cap.   
     
     
         11 . The liner of  claim 9 , wherein the upper multilayer and the lower multilayer are joined to each other along the contact surface by an adhesive. 
     
     
         12 . The liner of  claim 9 , wherein outside the weakening line there is no connection between the upper multilayer and the lower multilayer. 
     
     
         13 . The liner of  claim 9 , including the following structure, listed from uppermost to lowermost:
 A) PET (polyethylene terephthalate);   B) Glue;   C) CPP film (unstretched polypropylene);   D) Glue;   E) Aluminum foil;   F) Glue; and   G) Sealing film.   
     
     
         14 . The liner of  claim 13 , wherein the weakening line weakens the sealing film layer (G). 
     
     
         15 . The liner of  claim 14 , wherein the contact surface lies within an area including the glue layer (F). 
     
     
         16 . The liner of  claim 14 , wherein the weakening line also weakens the aluminum foil layer (E), and the contact surface lies within an area including the glue layer (D). 
     
     
         17 . The liner of  claim 9 , wherein the weakening line is formed in the liner by a laser beam. 
     
     
         18 . A container having a rotary closure; comprising:
 a rotary cap, wherein in an original closed state the rotary cap is screwed onto an annular face of an opening of the container;   a liner that closes the opening of the container, the liner being disposed between a circular face of an inside of the rotary cap and the annular face of the opening;   the liner having at least an upper multilayer and a lower multilayer joined to each other along a contact surface, the upper multilayer initially disposed within the rotary cap and attached to at least a central part of the circular face, and the lower multilayer firmly joined to the annular face of the opening;   wherein the liner incorporates a closed weakening line disposed around the central part of the circular face, and the liner is configured so that along the contact surface the connection between the upper multilayer and the lower multilayer is strong, and outside the weakening line the connection between the upper multilayer and the lower multilayer is substantially weaker.   
     
     
         19 . The container of  claim 18 , wherein the upper multilayer and the lower multilayer are independent of each other. 
     
     
         20 . The container of  claim 18 , wherein the liner is configured so that the upper multilayer and the lower multilayer are joined to each other along the contact surface by an adhesive, and outside the weakening line there is no connection between the upper multilayer and the lower multilayer. 
     
     
         21 . The container of  claim 18 , wherein the liner has a layered structure including, in order from the circular face of the inside of the rotary cat to the annular face of the container opening:
 A) PET (polyethylene terephthalate);   B) Glue;   C) CPP film (unstretched polypropylene);   D) Glue;   E) Aluminum foil;   F) Glue; and   G) Sealing film.   
     
     
         22 . The container of  claim 21 , wherein the glue layer (F) is colored. 
     
     
         23 . The container of  claim 21 , wherein the liner is configured so that the weakening line weakens the sealing film layer (G). 
     
     
         24 . The container of  claim 23 , wherein the liner is configured so that the contact surface lies within an area including the glue layer (F). 
     
     
         25 . The container of  claim 23 , wherein the liner is configured so that the weakening line also weakens the aluminum foil layer (E), and the contact surface lies within an area including the glue layer (D). 
     
     
         26 . The container of  claim 18 , wherein the liner further includes a separation line disposed concentric with the weakening line and having a diameter that substantially corresponds to an inside diameter of the rotary cap. 
     
     
         27 . The container of  claim 18 , wherein the lower multilayer is firmly joined to the annular face of the opening by induction sealing. 
     
     
         28 . The container of  claim 18 , wherein the weakening line is formed in the liner by a laser beam. 
     
     
         29 . The container of  claim 18 , wherein the container is a medication bottle.