Weldable spunbond fabric, method of making same, and packaging made therefrom

Abstract

A weldable spun-bonded nonwoven has endless filaments of a thermoplastic plastic that contain at least 3 wt % of at least one filler to improve the weldability of the spun-bonded nonwoven. In addition the endless filaments are monocomponent filaments.

1 . A weldable spun-bonded nonwoven, wherein
 the spun-bonded nonwoven has endless filaments of a thermoplastic plastic,   the endless filaments contain at least 3 wt % of at least one filler to improve the weldability of the spun-bonded nonwoven, and   the endless filaments are monocomponent filaments.   
     
     
         2 . A weldable spun-bonded nonwoven, wherein
 the spun-bonded nonwoven contains endless filaments of a thermoplastic plastic,   the endless filaments are multicomponent filaments, and   at least one component of these endless filaments contains at least 3 wt % of at least one filler to improve the weldability of the spun-bonded nonwoven by reducing the welding temperature in thermal welding of the spun-bonded nonwoven.   
     
     
         3 . The weldable spun-bonded nonwoven according to one of  claims 2 , wherein the one component of the endless filaments has 4 to 25 wt % of the filler. 
     
     
         4 . The weldable spun-bonded nonwoven according to  2 , wherein the filler is a metal salt, preferably an alkaline earth metal salt. 
     
     
         5 . The weldable spun-bonded nonwoven according to  claim 2 , wherein a first plastic component present on the surface of the multicomponent filaments or bicomponent filaments has the same or a lower melting point than a second plastic component of the filaments and the filler is contained at least in the first same- or lower-melting-point plastic component. 
     
     
         6 . The weldable spun-bonded nonwoven according to  claim 5 , wherein the multicomponent filaments are bicomponent filaments that have a core/sheath configuration and the sheath constitutes the same- or lower-melting-point plastic component of the filament. 
     
     
         7 . The weldable spun-bonded nonwoven according to  claim 6 , wherein the filler is present at least in the sheath of the bicomponent filaments filaments. 
     
     
         8 . The weldable spun-bonded nonwoven according to  claim 6 , wherein a mass ratio of the first, same- or lower-melting-point plastic component to the second, higher-melting-point plastic component is 10:90 to 35:65. 
     
     
         9 . The weldable spun-bonded nonwoven according to  claim 1 , wherein the spun-bonded nonwoven is a calendered spun-bonded nonwoven and at least one surface of the spun-bonded nonwoven is calendered smooth. 
     
     
         10 . A method of making a weldable spun-bonded nonwoven or packaging spun-bonded nonwoven according to  claim 1 , wherein endless filaments are spun by a spinneret, are cooled in a cooler, and then stretched by a stretcher and are then deposited on a deposition apparatus to produce the spun-bonded nonwoven. 
     
     
         11 . The method according to  claim 10 , wherein the spun-bonded nonwoven is pressed with a calender having an embossing surface of 10 to 90% and preferably 18 to 30% and wherein preferably the embossing depth calender engraving 0.1 to 0.6 mm, preferably 0.2 to 0.4 mm. 
     
     
         12 . The method according to  claim 10 , wherein the number of engraved points of the calender is greater than 30/cm 2 . 
     
     
         13 . A package for containing pourable and/or free-flowing products such as cement and the like, having at least one spun-bonded nonwoven or packaging spun-bonded nonwoven according to  claim 1 , wherein the spun-bonded nonwoven/packaging spun-bonded nonwoven forms the package wall and/or is a component of the package wall and wherein sections of the spun-bonded nonwoven/packaging spun-bonded nonwoven in the side wall region and/or at the bottom and/or at the top of the package or the package wall are welded to one another. 
     
     
         14 . The package according to  claim 13 , wherein the spun-bonded nonwoven/packaging spun-bonded nonwoven is a component of a package wall laminate and wherein the laminate preferably also contains at least one film, preferably a plastic film. 
     
     
         15 . The package according to  claim 14 , wherein the film or plastic film is provided on an inner face of the package wall. 
     
     
         16 . The package according to  claim 13 , wherein the side wall of the package contains at least one spun-bonded nonwoven, the spun-bonded nonwoven contains bicomponent filaments with a core/sheath configuration and the mass ratio of the core to the sheath is 10:90 to 35:65. 
     
     
         17 . The package according to  claim 13 , wherein at least one top wall and/or at least one flat top wall is a component of the package wall, wherein the top wall contains at least one spun-bonded nonwoven, in particular according to one of  claims 2  through  9 , wherein the spun-bonded nonwoven contains bicomponent filaments with a core/sheath configuration and wherein the mass ratio of the core to the sheath is 35:65 to 50:50. 
     
     
         18 . The package according to  claim 13 , wherein at least one bottom wall and/or at least one flat bottom wall is a component of the package wall, wherein the bottom wall contains at least one spun-bonded nonwoven, in particular according to one of  claims 2  through  9 , wherein the spun-bonded nonwoven contains bicomponent filaments with a core/sheath configuration and wherein the mass ratio of the core to the sheath is 35:65 to 50:50, preferably 40:60 to 45:55. 
     
     
         19 . A spun-bonded nonwoven, wherein
 the spun-bonded nonwoven is formed wholly of endless bicomponent filaments of at least one thermoplastic plastic and each having a core and a sheath, and   the sheaths each contain at least 3 wt % of at least one filler that lowers the melting point of the sheath below that of the cores.