Welded part with barrier layer

Abstract

The invention relates to a welded part ( 1 ) made from plastic between the flexible walls of a container, in particular of a bag, with a stub ( 3 ) which is formed integrally on the welded part at the top and forms a pouring channel which connects the upper pouring opening of the stub to the lower pouring channel region ( 3 a ) of the lower welded region ( 2 ), wherein a barrier layer ( 6 ) is arranged in the pouring channel, which barrier layer ( 6 ) is opened by a projection ( 8 ) of a closure cap ( 7 ) which can be screwed onto the stub ( 3 ), wherein the projection ( 8 ) of the closure cap ( 7 ), which projection ( 8 ) reaches into the pouring channel ( 4 ), is fastened to the barrier layer ( 6 ), as a result of which the barrier layer ( 6 ) is removed completely or partially when the closure cap ( 7 ) is screwed open.

1 . A weld-in part made of plastic for installation between the flexible walls of a container, the part comprising:
 an upwardly projecting spout forming an upper pour passage terminating upward at an upper pour mouth;   a cap engaged downward over the mouth of the spout and upwardly unscrewable therefrom;   a base integrally formed with the spout and forming a lower pour passage joined to the upper pour passage;   a barrier layer in one of the pour passages; and   a projection on the closure cap, extending downward therefrom into the upper pour passage, and fastened to the barrier layer so that the barrier layer is at least partially removed as the closure cap is unscrewed.   
     
     
         2 . The weld-in part according to  claim 1 , wherein the barrier layer is fastened in the upper pour passage or in the lower pour passage or in an intermediate region between the upper pour passage and the lower pour passage. 
     
     
         3 . The weld-in part according to  claim 1 , wherein the barrier layer is at a spacing from a lower face of the weld-in base that is at least one fourth of a height of the weld-in base. 
     
     
         4 . The weld-in part according to  claim 1 , wherein the barrier layer is above an upper face of the weld-in base. 
     
     
         5 . The weld-in part according to  claim 1 , wherein the barrier layer is above a lower edge face of a lower end of the closure cap. 
     
     
         6 . The weld-in part according to  claim 1 , wherein the barrier layer is above a bottom edge of a tamper-indicating ring that is fastened to the lower face of the lower end of the closure cap. 
     
     
         7 . The weld-in part according to that  claim 1 , wherein the barrier layer is a film made of plastic, metal, or a composite of a plastic film and metal. 
     
     
         8 . The weld-in part according to that  claim 1 , wherein the barrier layer is a film composite of polyester, aluminum, and polyethylene or of polyester, aluminum, and polypropylene. 
     
     
         9 . The weld-in part according to that  claim 1 , wherein the barrier layer is a composite of a sealing wax layer and/or a plastic layer having a polyethylene layer or a polypropylene layer. 
     
     
         10 . The weld-in part according to that  claim 1 , wherein the projection of the closure cap is adhesively bonded or welded to the barrier layer at a lower end face of the projection of the closure cap. 
     
     
         11 . The weld-in part according to that  claim 1 , wherein the lower end of the projection of the closure cap forms a face that is fastened to the barrier layer. 
     
     
         12 . The weld-in part according to that  claim 1 , wherein the barrier layer is a film having at least one weakened zone formed by a predetermined breaking point or predetermined tear line. 
     
     
         13 . The weld-in part according to  claim 12 , wherein the weakened zone surrounds where the projection and the barrier layer are fastened to each other. 
     
     
         14 . The weld-in part according to  claim 1 , wherein the lower pour passage in the weld-in part has a diameter that is larger than a diameter (D 4 ) of the upper pour passage in the spout, the upper pour passage in the spout being coaxial to the lower pour passage. 
     
     
         15 . The weld-in part according to  claim 12 , wherein a transition from the lower pour passage to the upper pour passage in the spout is formed by an annular constriction to which an annular periphery of the barrier layer is welded or adhesively bonded. 
     
     
         16 . The weld-in part according to  claim 15 , wherein the annular constriction is shaped as a circular ring or frustocone. 
     
     
         17 . The weld-in part according to  claim 1 , wherein the barrier layer has an integral and downwardly extending cylindrical tube that lies against an inner wall of the lower pour passage. 
     
     
         18 . The weld-in part according to  claim 17 , wherein the barrier layer and and tube are produced in advance from a film composite as a preformed part shaped as a cup. 
     
     
         19 . The weld-in part according to  claim 18 , wherein the cup-shaped barrier layer is produced from a film composite by thermoshaping or deep drawing. 
     
     
         20 . The weld-in part according to  claim 18 , wherein the barrier layer having the shape of a cup is introduced into the weld-in part by a two-component injection-molding process. 
     
     
         21 . The weld-in part according to that  claim 1 , wherein the base of the weld-in part is boat-shaped.