Flexible container having an access port, method for the production of said container and welding tool for implementing said method

Abstract

The invention relates to the area of flexible containers in which an access port is provided toward the interior of the container. To increase the stability of such a container ( 1 ) at the position of the access port ( 4 ), the invention provides that the connection seam ( 2 ) connecting the access port ( 4 ) to a flexible foil is prolonged in the direction of a section ( 4 a ) of the access port ( 4 ) projecting over the connection seam ( 2 ) in order likewise to connect a part ( 5 ) of this section ( 4 a ) of the access port ( 4 ) to the foil. It is achieved by this measure that the peeling forces particularly effective in this region in the event of a pressure load are countered better. The invention also relates to a method for the manufacture of such a flexible container and to a welding tool for this.

1 . A flexible container ( 1 ) having an access port ( 4 ) in which a flexible foil and a second area-like boundary part are connected to one another along a connection seam ( 2 ) and wherein the connection seam ( 2 ) passes over an access port ( 4 ) which is arranged between the foil and the boundary part and represents an access from the exterior of the container to the interior of the container, wherein the access port ( 4 ) has a section ( 4   a ) which projects over the connection seam ( 2 ) in the direction of the interior of the container, 
 characterized in that    the connection seam ( 2 ) is prolonged at the position, at which it connects the access port ( 4 ) to the foil, in the direction of the projecting section ( 4   a ) of the access port ( 4 ) to likewise connect a part ( 5 ) of this section ( 4   a ) of the access port ( 4 ) to the foil.    
     
     
         2 . A flexible container in accordance with  claim 1 , wherein the second area-like boundary part is likewise a flexible foil.  
     
     
         3 . A flexible container in accordance with  claim 1 , wherein the access port ( 4 ) is a hose.  
     
     
         4 . A flexible container in accordance with  claim 1 , wherein the access port is a boat-like insert having at least one access opening.  
     
     
         5 . A flexible container in accordance with  claim 1 , wherein the container is formed from a folded over piece of foil as well as of one longitudinal connection seam and two transverse connection seams, with the access port being arranged in one of these connection seams.  
     
     
         6 . A flexible container in accordance with  claim 1 , wherein the container ( 1 ) is made from a hose foil and two transverse connection seams ( 2 ,  3 ), with the access port ( 4 ) being arranged in one of these connection seams.  
     
     
         7 . A flexible container in accordance with  claim 1 , wherein the connection seams ( 2 ) are weld seams.  
     
     
         8 . A flexible container in accordance with  claim 1 , wherein the connection seams ( 2 ) are adhesive seams.  
     
     
         9 . A flexible container in accordance with  claim 1 , wherein the part ( 5 ) of the connection seam ( 2 ) which partly connects the projecting section ( 4   a ) of the access port ( 4 ) to the foil is made in tab shape.  
     
     
         10 . A flexible container in accordance with  claim 9 , wherein the tab-like prolongation ( 5 ) of the connection seam ( 2 ) has a section which corresponds to the intersection line between a semi-circular groove ( 11 ) and a plane ( 12 ) extending at an incline to the groove by an acute angle —preferably by 30 to 60 degrees.  
     
     
         11 . A method for the insertion of an access port ( 4 ) between a flexible foil and a second area-like boundary part of a flexible container ( 1 ), wherein the access port ( 4 ) is positioned between the foil and the boundary part, the foil and the boundary part are connected to one another along a connection seam ( 2 ) which passes over the access port ( 4 ), with the access port ( 4 ) projecting over the connection seam ( 2 ) by a section ( 4   a ) in at least one direction, 
 characterized in that    the foil and parts ( 5 ) of the projecting section ( 4   a ) of the access port ( 4 ) are connected to one another as a part of the connection seam ( 2 ).    
     
     
         12 . A method in accordance with  claim 11 , wherein the connection seam ( 2 ) is welded.  
     
     
         13 . A welding tool ( 10 ) for the carrying out of the method in accordance with  claim 12  which consists of a block-like substrate which has a groove ( 11 ) extending in a first surface ( 13 ) and having the contours of the access port ( 4 ), with both the first surface ( 13 ) and the contours of the groove ( 11 ) being made as heating surfaces for thermal contact welding, 
 characterized in that    the groove ( 11 ) is bounded by a second surface ( 12 ) of the substrate which has a acute angle of inclination to the first surface ( 13 ).    
     
     
         14 . A welding tool in accordance with  claim 13 , wherein the groove ( 11 ) has a semi-circular section for the reception of the longitudinally extending half of an access port ( 4 ) formed as a hose.  
     
     
         15 . A welding tool in accordance with  claim 13 , wherein the acute angle of inclination lies between 30 and 60 degrees.