Cap having a chamber for a raw material and sealing mechanism for a vessel

Abstract

A cap has a plastic plug portion and a plastic seal plug. The plug portion has a side wall having an inner circumferential surface arranged to fit on an outer circumferential surface of the opening portion, and a cylindrical wall forming a receiving chamber having an opening at its lower end face, which wall projects from a top wall on the inside of the side wall. The seal plug has the outer diameter being larger than the outer diameter of the cylindrical wall and is welded to the lower end face of the cylindrical wall while the receiving chamber is filled with a filling. In a sealing mechanism relating to the present invention, the seal plug closes the opening by being fixed to the cylindrical wall being loosely fitted into a sleeve. The sleeve is welded to the inner circumferential surface of the opening portion.

What is claimed is:  
     
         1 . A cap comprising: 
 a plastic plug portion ( 4 ) and a plastic seal plug ( 5 ),    said plug portion ( 4 ) having a top wall ( 11 ) to cover an opening portion ( 3 ) of a vessel ( 2 ), a side wall ( 12 ) projecting from said top wall ( 11 ) along an axis (X) of said plug portion ( 4 ), which wall has an inner circumferential surface arranged to fit on an outer circumferential surface of said opening portion ( 3 ), and a cylindrical wall ( 15 ) forming a receiving chamber ( 14 ) having an opening ( 13 ) at its lower end face, which wall projects from said top wall ( 11 ) on the inside of said side wall ( 12 ),    said seal plug ( 5 ) having the outer diameter (D1) being larger than outer diameter (D2) of said cylindrical wall ( 15 ),    and wherein said seal plug ( 5 ) is welded to the lower end face of said cylindrical wall ( 15 ) while said receiving chamber ( 14 ) is filled with a filling ( 16 ).    
     
     
         2 . A sealing mechanism for a plastic vessel ( 2 ) which can be closed by a plastic cap ( 1 ), which mechanism having a plastic sleeve ( 6 ), 
 the vessel ( 2 ) having an opening portion ( 3 ) and the cap ( 1 ) having a plug portion ( 4 ) and a seal plug ( 5 ), wherein    said plug portion ( 4 ) has a top wall ( 11 ) to cover an opening portion ( 3 ) of a vessel ( 2 ), a side wall ( 12 ) projecting from said top wall ( 11 ) along an axis (X) of said plug portion ( 4 ), which wall has an inner circumferential surface arranged to fit on an outer circumferential surface of said opening portion ( 3 ), and a cylindrical wall ( 15 ) forming a receiving chamber ( 14 ) having an opening ( 13 ) at its lower end face, which wall projects from said top wall ( 11 ) on the inside of said side wall ( 12 ),    said seal plug ( 5 ) closes said opening ( 13 ) by being fixed to said cylindrical wall ( 15 ) loosely fitting into said sleeve ( 6 ) and has an outer circumferential portion ( 17 ) projecting from the outer circumferential surface of said cylindrical wall ( 15 ) to a position where it comes below said sleeve ( 6 ) on the direction along said axis (X),    said sleeve ( 6 ) is welded to the inner circumferential surface of said opening portion ( 13 ).    
     
     
         3 . A sealing mechanism as claimed in  claim 2  wherein said seal plug ( 5 ) is welded to the lower end face of said cylindrical wall ( 15 ) while said receiving chamber ( 14 ) is filled with a filling ( 16 ).  
     
     
         4 . A sealing mechanism as claimed in  claim 2  or  3  wherein said sleeve ( 6 ) has a sharp head portion ( 18 ) formed by its lower end face sloping with respect to the axis (X).  
     
     
         5 . A sealing mechanism as claimed in any one of claims  2  or  3  wherein said sleeve ( 6 ) and said seal plug ( 5 ) are made of same material as of said vessel ( 2 ).  
     
     
         6 . A sealing mechanism as claimed in  claim 5  wherein said material of which said vessel ( 2 ), said sleeve ( 6 ), and said seal plug ( 5 ) are made is PET (polyethylen-telephtalate).  
     
     
         7 . A sealing mechanism as claimed in any one of claims  2  or  3  wherein said cap ( 1 ) is made of same material as of said vessel ( 2 ).  
     
     
         8 . A sealing mechanism as claimed in  claim 7  wherein said material of which said cap ( 1 ) and said vessel ( 2 ) are made is PET (polyethylen-telephtalate).  
     
     
         9 . A sealing mechanism as claimed in any one of  claim 4  wherein said sleeve ( 6 ) and said seal plug ( 5 ) are made of same material as of said vessel ( 2 ).  
     
     
         10 . A sealing mechanism as claimed in  claim 9  wherein said material of which said vessel ( 2 ), said sleeve ( 6 ), and said seal plug ( 5 ) are made is PET (polyethylen-telephtalate).  
     
     
         11 . A sealing mechanism as claimed in any one of  claim 4  wherein said cap ( 1 ) is made of same material as of said vessel ( 2 ).  
     
     
         12 . A sealing mechanism as claimed in any one of  claim 5  wherein said cap ( 1 ) is made of same material as of said vessel ( 2 ).  
     
     
         13 . A sealing mechanism as claimed in any one of  claim 9  wherein said cap ( 1 ) is made of same material as of said vessel ( 2 ).  
     
     
         14 . A sealing mechanism as claimed in  claim 11  wherein said material of which said cap ( 1 ) and said vessel ( 2 ) are made is PET (polyethylen-telephtalate).  
     
     
         15 . A sealing mechanism as claimed in  claim 12  wherein said material of which said cap ( 1 ) and said vessel ( 2 ) are made is PET (polyethylen-telephtalate).  
     
     
         16 . A sealing mechanism as claimed in  claim 13  wherein said material of which said cap ( 1 ) and said vessel ( 2 ) are made is PET (polyethylen-telephtalate).