Paper bag

Abstract

The invention relates to a paper bag for packaging of bulk material, having a standing bottom ( 2 ) and a valve bottom ( 3 ), a front wall ( 4 ) and a rear wall, the front wall and the rear wall being glued to each other in overlapping relationship, the paper bag further comprising cover sheets ( 5, 5 ′) for closing the standing bottom ( 2 ) and the valve bottom ( 3 ), wherein the cover sheet ( 5 ) of the standing bottom ( 2 ) and/or of the valve bottom ( 3 ) is provided with a tear open strip ( 6 ) which extends across the entire length of the bottom. It is characterized in that a foil ( 9 ) is placed below the standing bottom cover sheet ( 5 ) and/or below the valve bottom cover sheet ( 5 ′) and is removably glued to the paper bag ( 1 ) in such a manner that after tearing open of the standing bottom cover sheet ( 5 ) and/or of the valve bottom cover sheet ( 5 ′) the foil ( 9 ) still closes the paper bag ( 1 ) completely and sets the product free only after peeling off said foil.

What is claimed is: 
     
         1 . A paper bag ( 1 ) for packaging bulk material, comprising
 a bag body including a standing bottom ( 2 ) and valve bottom ( 3 ) at opposite ends thereof, and a front wall ( 4 ) and rear wall extending between the standing ( 2 ) and valve ( 3 ) bottoms and coupled to each other in overlapping relationship,   said front ( 4 ) and rear walls together defining an interior of the bag ( 1 ),   each of said standing bottom ( 2 ), valve bottom ( 3 ) front wall ( 4 ) and rear wall comprising paper,   a separate single cover sheet ( 5 ) closing said standing bottom ( 2 ) and affixed to both said front ( 4 ) and rear walls,   said cover sheet ( 5 ) having a tear-open strip ( 6 ) spaced from the front ( 4 ) and rear walls and extending across an entire length of said standing bottom ( 2 ),   said front ( 4 ) and rear walls extending into two diametrically-opposed side flaps ( 5 ″,  5 ″) inwardly folded towards one another to be situated underneath said separate cover sheet ( 5 ) and tear-open strip ( 6 ), such that upon severing the tear-open strip ( 6 ), each said flap ( 5 ″,  5 ″) is upwardly and outwardly pivotal from said respective front ( 4 ) and rear walls to unfold said bottom,   said cover sheet ( 5 ) comprising paper such that severing the tear-open strip ( 6 ) releases loose paper fibers, and   a foil ( 9 ) removably secured to the front ( 4 ) and rear walls of the bag body to cover an opening into the interior of the bag ( 1 ) at the standing bottom ( 2 ) and also removably affixed to sides of said respective flaps ( 5 ″,  5 ″) opposite to the sides of said flaps ( 5 ″,  5 ″) bordering said separate cover sheet ( 5 ) when folded inwardly,   said foil ( 9 ) remaining affixed to said bag ( 1 ) and said respective side flaps ( 5 ″,  5 ″) upon severing the tear-open strip ( 6 ) and unfolding said respective side flaps ( 5 ″,  5 ″), and   said foil being peelable off said side flaps ( 5 ″,  5 ″) and bag body to expose the bag interior, after said tear-open strip ( 6 ) is severed and said respective side flaps ( 5 ″,  5 ″) pivoted.   
     
     
         2 . The paper bag according to  claim 1 , wherein
 the bag body additionally comprises side walls ( 8 ,  8 ′) interconnecting said front ( 4 ) and rear walls and extending between the standing ( 2 ) and valve ( 3 ) bottoms, with said foil ( 9 ) additionally removably affixed to said side walls ( 8 ,  8 ′)   said tear-open strip ( 6 ) extending across said standing bottom ( 2 ) in a direction between said side walls ( 8 ,  8 ′) such that the tear-open strip ( 6 ) is severable by being pulled in a direction from one of said side walls ( 8 ,  8 ′) to an opposite side wall ( 8 ,  8 ′), and   said foil ( 9 ) also remaining affixed to said side walls ( 8 ,  8 ′) upon severing the tear-open strip ( 6 ), and being peelable off said side flaps ( 5 ″,  5 ″) and side walls ( 8 ,  8 ′) to expose the bag interior, after said tear-open strip ( 6 ) is severed and said side flaps ( 5 ″,  5 ″) upwardly and outwardly pivoted.   
     
     
         3 . The paper bag according to  claim 2 , wherein said side flaps ( 5 ″,  5 ″) overlap one another underneath said separate cover sheet ( 5 ) and tear-open strip ( 6 ) when folded inwardly. 
     
     
         4 . The paper bag according to  claim 1 , wherein said foil comprises plastic. 
     
     
         5 . The paper bag according to  claim 1 , wherein said foil comprises metal. 
     
     
         6 . The paper bag according to  claim 1 , wherein said foil comprises a coated paper or a paper foil. 
     
     
         7 . The paper bag according to  claim 1 , wherein said foil comprises a fiber glass foil, a woven foil or a spunbonded foil made of woven fibers. 
     
     
         8 . The paper bag according to  claim 1 , wherein said foil comprises a biodegradable, compostable or recyclable material. 
     
     
         9 . The paper bag according to  claim 1 , wherein said side strips cooperatively include a closure device disposed along the tear-open edges of the side strips. 
     
     
         10 . The paper bag according to  claim 1 , wherein said paper bag body further includes a pair of opposite side walls, said closure device comprises a snap lock and said snap lock including a groove and a tongue each extending from one side wall to the other side wall. 
     
     
         11 . The paper bag according to  claim 10 , wherein said closure device comprises a hook-and-loop fastener extending from one side wall to the other side wall. 
     
     
         12 . The paper bag according to  claim 1 , wherein said foil is fully-coated or coated within a region on a bottom side thereof with re-adherable adhesive. 
     
     
         13 . The paper bag according to  claim 1 , wherein said foil comprises at least one recess defined therethrough. 
     
     
         14 . The paper bag according to  claim 1 , wherein said foil is provided with safety features to evidence tampering or damage. 
     
     
         15 . The paper bag according to  claim 1 , wherein said cover sheet includes a handle, sand handle extending generally parallel to the tear-open strip, said tear-open strip being disposed away from a center of the cover sheet. 
     
     
         16 . The paper bag according to  claim 14 , wherein said safety features comprise pictures, holograms, and/or strips operable to indicate foil damage resulting from peeling off the foil away from the paper bag. 
     
     
         17 . The paper bag according to  claim 1 , wherein said foil is printed with indicia. 
     
     
         18 . The paper bag according to  claim 17 , wherein said indicia comprise contents and/or instructions.