Head for a flexible tube comprising a peripheral welding surface

Abstract

A head for a tube includes a flexible skirt. The head includes an annular shoulder, an exposed inner annular portion, an annular peripheral bearing face, and an annular shoulder face. The annular shoulder extends from the central portion in a substantially radial direction. The exposed inner annular portion of the shoulder is configured to be visible after assembly of the head with the flexible skirt. The annular peripheral bearing face of the shoulder against which an upper end segment of the flexible skirt is intended to be folded back to enable it to be welded. The annular shoulder face projects with respect to the peripheral bearing face. The annular shoulder face has, in axial section, an opening angle (β) greater than 125° with respect to the peripheral bearing face.

1 . A head for a tube comprising a flexible skirt, the head comprising:
 a central portion equipped with a dispensing orifice,   an annular shoulder which extends from the central portion in a substantially radial direction,   an exposed inner annular portion of the shoulder which is configured to be visible after assembly of the head with the flexible skirt;   an annular peripheral bearing face of the shoulder against which an upper end segment of the flexible skirt is intended to be folded back to enable it to be welded;   an annular shoulder face projecting with respect to the peripheral bearing face and facing radially outwards, which delimits the peripheral bearing face and the exposed portion;   wherien the annular shoulder face has, in axial section, an opening angle (β) greater than 125° with respect to the peripheral bearing face.   
     
     
         2 . The head according to  claim 1 , wherein the annular shoulder face has, in axial section, an opening angle (β) greater than 140° with respect to the peripheral bearing face. 
     
     
         3 . The head according to  claim 2 , wherein the annular shoulder face has, in axial section, an opening angle (β) of less than 155° with respect to the peripheral bearing face. 
     
     
         4 . The head according to  claim 3 , wherein the annular shoulder face has, in axial section, an angle (β) equal to 148° with respect to the peripheral bearing face. 
     
     
         5 . The head according to  claim 1 , wherein the peripheral bearing face extends, in axial section, parallel to at least one external peripheral part of the exposed portion of the shoulder. 
     
     
         6 . The head according to  claim 5 , wherein the bearing face is extended axially downwards by an axial sleeve which is configured to be fitted into the flexible skirt and which is connected to the bearing face by a rounded portion. 
     
     
         7 . A flexible tube comprising a head according to  claim 1  and a flexible skirt, an upper end segment of which is folded back onto the peripheral bearing face and welded against said peripheral bearing face. 
     
     
         8 . The tube according to  claim 7 , wherein the shoulder face has a height, taken orthogonally to the peripheral bearing face, which is greater than or equal to the nominal thickness of the wall of the flexible skirt before it is welded to the head. 
     
     
         9 . The tube according to  claim 8 , wherein the height of the shoulder face is between 0.40 mm and 0.70 mm. 
     
     
         10 . The tube according to  claim 9 , wherein the height is equal to 0.40 mm and the nominal thickness of the wall of the skirt before it is welded to the head is between 200 μm and 400 μm. 
     
     
         11 . The tube according to  claim 9 , wherein the height is equal to 0.70 mm and the nominal thickness of the wall of the skirt before it is welded to the head is between 200 μm and 500 μm.