Plastic closure device for tubular bags

Abstract

A plastic closure device ( 1 ) must be welded by means of ultrasound onto a tubular bag ( 2 ) consisting of a multilayer plastic film ( 20 ). For this purpose, an energy introduction arrangement ( 182 ) on the underside ( 180 ) of a flange ( 18 ) is proposed, in which at least one energy conduction rib ( 183 ) concentric with the outer edge ( 181 ) of the flange is present, as well as a plurality of outwardly-directed energy conduction ribs ( 184 ). These energy conduction ribs can intersect in the region of intersection ( 185 ) or they can be interrupted in the region of intersection.

1 . A tubular bag apparatus comprising a tubular bag ( 2 ) consisting of multilayer plastic film, a plastic closure device ( 1 ) comprising a bottom part ( 10 ) having a spout ( 14 ) and a flange ( 18 ), and an energy introduction arrangement ( 182 ), which is connected to a plastic layer of the tubular bag ( 2 ), being located on a flange underside ( 180 ) of said flange, wherein the energy introduction arrangement ( 182 ) has at least one energy-conducting rib ( 183 ) which extends concentrically with respect to a peripheral flange rim, characterized in that the at least one concentric energy-conducting rib ( 183 ) intersects a multiplicity of energy-conducting ribs ( 184 ) which extend and are oriented outwardly and which extend as far as the peripheral flange rim ( 181 ). 
     
     
         2 . The tubular bag apparatus as claimed in  claim 1 , characterized in that the outwardly extending energy-conducting ribs ( 184 ) are radially outwardly oriented and intersect the at least one concentric energy-conducting rib ( 183 ). 
     
     
         3 . The tubular bag apparatus as claimed in  claim 1 , characterized in that the energy-conducting ribs ( 184 ) have a rounded cross section having a radius (r) on their encircling round ends and subsequently merge with outwardly inclined flanges ( 18 ), with maximum elevations forming an approximately punctiform support. 
     
     
         4 . The tubular bag apparatus as claimed in  claim 2 , characterized in that a flange top side is freely accessible above a region in which the energy-conducting ribs ( 183 ) are located. 
     
     
         5 . The tubular bag apparatus as claimed in  claim 3 , characterized in that flanks of the energy-conducting ribs ( 183 ), which flanks are evident in cross section, enclose an angle (α) of 50° to 70°. 
     
     
         6 . The tubular bag apparatus as claimed in  claim 1 , characterized in that round ends of the energy-conducting ribs ( 183 ) are, when viewed in cross section, approximately punctiform supports of the energy-conducting ribs. 
     
     
         7 . The tubular bag apparatus as claimed in  claim 1 , characterized in that a height (h) of the energy-conducting ribs ( 183 ) measures between 0.2 and 0.4 mm. 
     
     
         8 . The tubular bag apparatus as claimed in  claim 1 , characterized in that the underside is curved toward a flange top side in a peripheral region (Y) which is adjacent to an outer energy-conducting rib ( 184 ). 
     
     
         9 . The tubular bag apparatus as claimed in  claim 1 , characterized in that the energy-conducting ribs ( 184 ), which extend and are oriented outwardly, are interrupted in an intersecting region ( 185 ) and are spaced at a distance which is equal to at least a width of one energy-conducting rib from the at least one concentrically extending energy-conducting rib ( 183 ) in a virtual intersecting region ( 185 ). 
     
     
         10 . The tubular bag apparatus as claimed in  claim 1 , characterized in that the at least one concentrically extending energy-conducting rib ( 183 ) is interrupted in a virtual intersecting region ( 185 ). 
     
     
         11 . The tubular bag apparatus as claimed in  claim 1 , characterized in that the tubular bag ( 2 ) consists of a multilayer plastic film ( 20 ) which has one of the following combinations of layers:
   PP—AL—PE;
     PP—MPET—PE; and
     PP—PETSiOx—PE.
   
     
     
         12 . The tubular bag apparatus as claimed in  claim 1 , characterized in that the plastic closure device ( 1 ) consists of PP. 
     
     
         13 . The tubular bag apparatus as claimed in  claim 3 , characterized in that flanks of the energy-conducting ribs ( 183 ), which flanks are evident in cross section, enclose an angle (α) of 60°. 
     
     
         14 . The tubular bag apparatus as claimed in  claim 1 , characterized in that the height (h) of the energy-conducting ribs ( 183 ) measures 0.3 mm.