Paper valve sack with inner catch

Abstract

A description is given of a paper valve bag with an inner panel which is located at the paper-bag end which is located opposite the paper-bag end with valve, and, on its surface which is directed toward the sack interior, the inner panel has an opening aid which has a higher modulus of elasticity than the inner panel. The opening aid, which may be a tear-open strip or a tear-open thread, projects beyond the inner panel at at least one surface-area end of the latter. Such paper valve bags are used for fine-grain, pulverulent and/or free-flowing materials, in particular ready-to-use mortar.

1 - 12 . (canceled) 
   
   
       13 . A paper valve bag comprising an inner panel located at a paper-bag end which is located opposite the paper-bag end with valve, wherein on a surface which is directed toward the bag interior, the inner panel has an opening aid which has at least one of a higher modulus of elasticity or a higher tensile strength than the inner panel. 
   
   
       14 . A paper valve bag according to  claim 13 , wherein at least one surface-area end and at most two opposite surface-area ends of the inner panel, the opening aid extends beyond the extent of the surface area of the inner panel. 
   
   
       15 . A paper valve bag according to  claim 13 , wherein the opening aid is fitted parallel to a longitudinal extent of the inner-panel surface. 
   
   
       16 . A paper valve bag according to  claim 15 , wherein the opening aid is fitted in the center of the inner-panel surface. 
   
   
       17 . A paper valve bag according to  claim 13 , wherein the opening aid is a tear-open strip or a tear-open thread. 
   
   
       18 . A paper valve bag according to  claim 13 , wherein the opening aid comprises a modified natural product selected from the group consisting of wool, cotton and cellulose. 
   
   
       19 . A paper valve bag according to  claim 13 , wherein the opening aid comprises a plastic comprising a monomer selected from the group consisting of ethylene, styrene, vinyl acetate, vinyl chloride, propylene and polyurethane. 
   
   
       20 . A paper valve bag according to  claim 13 , wherein the opening aid comprises a plastic. 
   
   
       21 . A paper valve bag according to  claim 13 , wherein the opening valve aid comprises modified natural product. 
   
   
       22 . A paper valve bag according to  claim 13  wherein the opening aid has a width or a diameter of 0.1 mm to 5 mm. 
   
   
       23 . A paper valve bag according to  claim 13 , wherein the opening aid is at least one of adhesively bonded or welded to the inner panel. 
   
   
       24 . A paper valve bag according to  claim 13 , wherein the paper-bag end with the inner panel has, in a direction of the exterior surroundings, at lest one of peel-back cover sheet or the bottom has a cover sheet adhesively bonded or welded over the surface area. 
   
   
       25 . A paper valve bag according to  claim 13 , containing a material selected from the group consisting of fine-grain, pulverulent or free-flowing materials. 
   
   
       26 . A paper valve bag according to  claim 25 , wherein the material has a particle-size distribution between 0.1 μm and 1.0 mm. 
   
   
       27 . A paper valve bag according to  claim 25 , wherein the material is an inorganic, organic or pure metal. 
   
   
       28 . A paper valve bag according to  claim 25 , wherein the material is an oxide, carbide, sulphide, hydroxide, salt, hydrocarbon, monomer or a polymer of natural or synthetic origin. 
   
   
       29 . A paper valve bag according to  claim 25 , wherein the material is an hydraulically setting material. 
   
   
       30 . A paper valve bag of  claim 29 , wherein the hydraulically setting material is ready-to-use mortar.