Moisture-Repellent Receptacle and Method for the Production Thereof

Abstract

The invention concerns a container, in particular a bag, for packaging bulk material such as cement, comprising at least one gas-permeable and moisture-repellent container wall 1 which essentially forms the container and which has a carrier layer 2 and a plastic layer 3 which is not closed.

1 - 15 . (canceled) 
     
     
         16 . A receptacle for packaging bulk material, comprising:
 a body having an internal cavity defined by a folded sheet of material with a carrier layer and a plastic layer, said carrier layer being formed from a fibrous web that is permeable to gas and impermeable to water, said plastic layer having openings that are permeable to gas and impermeable to water.   
     
     
         17 . The receptacle of  claim 16 , wherein said carrier layer is disposed between said internal cavity and said plastic layer. 
     
     
         18 . The receptacle of  claim 16 , wherein said carrier layer is a textile fabric. 
     
     
         19 . The receptacle of  claim 16 , wherein said carrier layer is paper. 
     
     
         20 . The receptacle of  claim 19 , wherein the carrier layer further includes perforations. 
     
     
         21 . The receptacle of  claim 16 , wherein said plastic layer is defined by strips of hot melt adhesive applied to said carrier layer. 
     
     
         22 . A method of manufacturing receptacles for packaging bulk materials, comprising the steps of:
 transporting a sheet of material in a machine direction, the sheet of material being a fibrous web that is permeable to gas and impermeable to water;   applying a plastic layer to the sheet of material, the plastic layer having openings that are permeable to gas and impermeable to water;   cutting the sheet of material into separate portions; and   shaping the separate portions to form individual receptacles.   
     
     
         23 . The method of  claim 22 , wherein applying the plastic layer further comprises:
 supplying liquid hot melt adhesive to a slot nozzle; and   spraying strips of the hot melt adhesive onto the sheet of material.   
     
     
         24 . The method of  claim 22 , wherein applying the plastic layer further comprises spraying plastic powder onto the sheet of material. 
     
     
         25 . The method of  claim 22 , further comprising:
 heating the sheet of material with a first heating element before applying the plastic layer.   
     
     
         26 . The method of  claim 25 , further comprising:
 heating the sheet of material with a second heating element after applying the plastic layer.   
     
     
         27 . The method of  claim 22 , further comprising:
 applying a second sheet of material to the plastic layer, the second sheet of material being a fibrous web that is permeable to gas and impermeable to water.   
     
     
         28 . The method of  claim 22 , wherein the individual receptacles are each defined by a body having an opening and an internal cavity, the method further comprising:
 supplying material into the internal cavity of each receptacle; and   sealing the opening of each receptacle to close the internal cavity;   wherein supplying the material forces air within the internal cavity to exit the receptacle through the sheet of material and plastic layer.   
     
     
         29 . The method of  claim 28 , wherein supplying the material further comprises delivering cement into the internal cavity of each receptacle. 
     
     
         30 . An apparatus for manufacturing a receptacle for packaging bulk material, wherein the receptacle is formed from a sheet of material being permeable to gas and impermeable to water, the apparatus comprising:
 one or more rollers adapted to transport the sheet of material in a machine direction;   a supply of hot melt adhesive proximate said one or more rollers;   a coating tool communicating with said supply and adapted to apply hot melt adhesive to the sheet of material so as to form a plastic layer thereon, said plastic layer having openings that are permeable to gas and impermeable to water;   a cutting tool adapted to cut the sheet of material to form a separate portion; and   a shaping tool adapted to reshape said separate portion to form the receptacle.   
     
     
         31 . The apparatus of  claim 30 , wherein said coating tool further comprises a slot nozzle adapted to receive hot melt adhesive from said supply. 
     
     
         32 . The apparatus of  claim 31 , wherein said slot nozzle is divided into separate portions such that said coating tool is adapted to apply strips of hot melt adhesive to the sheet of material. 
     
     
         33 . The apparatus of  claim 30 , wherein said coating tool further comprises a dispersing nozzle adapted to spray plastic powder onto the sheet of material.