Pre-stressed glass roll

Abstract

A glass roll includes at least one glass film and one intermediate material one on top of the other in at least two layers onto a winding core. The glass film layers are held in place by the intermediate material layers. The glass roll is produced with a method including provision of a glass film, a winding core and a compressible intermediate material. At least one inside layer of the intermediate material is wound onto the winding core. The glass film and the intermediate material are wound onto the winding core in such a manner that the glass film is wound onto the winding core in alternating layers with the intermediate material. The intermediate material and/or the glass film is wound at a tensile stress acting in a longitudinal direction which causes a compression of the intermediate material and holds the glass film end in place on the glass roll.

What is claimed is: 
     
         1 . A glass roll, comprising:
 a winding core;   at least one glass film having a fire-polished surface on at least one surface of two sides of said at least one glass film, said at least one glass film having a root mean square average on at least one said surface of said two sides of a maximum of 1 nanometer (nm); and   an intermediate material wound with said at least one glass film one on top of another onto said winding core in at least two layers defining a plurality of glass film layers and a plurality of intermediate film layers, said intermediate material layers holding said glass film layers in place.   
     
     
         2 . The glass roll according to  claim 1 , said intermediate layers holding said glass film layers in place being formed of a compressed intermediate material. 
     
     
         3 . The glass roll according to  claim 2 , said compressed intermediate material being configured to apply a restoring pressure against said glass film layers. 
     
     
         4 . The glass roll according to  claim 1 , said intermediate material being a foam film. 
     
     
         5 . The glass roll according to  claim 4 , said intermediate material being a polyolefin foam. 
     
     
         6 . The glass roll according to  claim 1 , said intermediate material being one of a structured paper, an embossed paper and a structured cardboard. 
     
     
         7 . The glass roll according to  claim 1 , said at least one glass film having a thickness of a maximum of approximately 350 micrometers (μm). 
     
     
         8 . The glass roll according to  claim 7 , said thickness of said at least one glass film being at least 5 μm. 
     
     
         9 . The glass roll according to  claim 1 , wherein at least one said surface of said at least one glass film has an average surface roughness of a maximum of 2 nm. 
     
     
         10 . The glass roll according to  claim 1 , said at least one glass film being coated on at least one of said two sides with a plastic layer. 
     
     
         11 . The glass roll according to  claim 10 , said plastic layer forming said intermediate material. 
     
     
         12 . The glass roll according to  claim 1 , wherein said intermediate material is a plurality of material layers. 
     
     
         13 . The glass roll according to  claim 12 , wherein said intermediate material layers have a plurality of different widths. 
     
     
         14 . The glass roll according to  claim 13 , wherein said intermediate material layers protrude laterally over said glass film layers. 
     
     
         15 . The glass roll according to  claim 1 , wherein said glass film layers are held in place by a force acting between said intermediate material layers and said glass film layers, said force including at least one of:
 a static friction in a range of between 0.15 and 10 Newtons (N); and   a frictional force in a range of between 0.15 and 5 N.   
     
     
         16 . The glass roll according to  claim 1 , wherein a pre-stress force (FV) is selected such that friction (FF) is greater than a force of weight (FG) of said wound roll using a plurality of parameters of said at least one glass film including:
 a material width (b);   a roll radius (r);   a thickness (t1);   a thickness of said intermediate layers (t2);   a coefficient of friction (μ);   a glass density (p); and   a known number (n) of wound layers of said at least one glass film.   
     
     
         17 . A glass roll comprising:
 a winding core;   at least one glass film having a first width; and   an intermediate material having a second width narrower than said first width and including at least one intermediate layer ribbon or an intermediate layer, said at least one glass film and said intermediate material being wound onto said winding core on top of one another in at least two layers defining a plurality of glass film layers and a plurality of intermediate material layers, said intermediate material holding said glass film layers in place.   
     
     
         18 . The glass roll according to  claim 17 , wherein said second width of said intermediate material is in a range of between approximately 10% and 70% of said first width of said at least one glass film. 
     
     
         19 . The glass roll according to  claim 17 , wherein said second width of said intermediate material is in a range of between approximately 2 millimeters (mm) and 600 mm. 
     
     
         20 . The glass roll according to  claim 17 , wherein a number of said intermediate layers or said intermediate layer ribbons is in a range of between 1 and 300. 
     
     
         21 . The glass roll according to  claim 17 , wherein said intermediate material is a plurality of one of cords and threads. 
     
     
         22 . The glass roll according to  claim 21 , said intermediate material is distributed over said first width of said at least one glass film such that a geometric unevenness in a surface of said at least one glass film in a width direction is substantially compensated for. 
     
     
         23 . The glass roll according to  claim 22 , said geometric unevenness being at least one of waviness and warp in said surface of said at least one glass film. 
     
     
         24 . The glass roll according to  claim 17 , said intermediate material being a compressed intermediate material. 
     
     
         25 . The glass roll according to  claim 24 , said compressed intermediate material being configured to apply a restoring pressure against said glass film layers. 
     
     
         26 . The glass roll according to  claim 25 , said intermediate material being a foam film. 
     
     
         27 . The glass roll according to  claim 26 , said intermediate material being a polyolefin foam. 
     
     
         28 . The glass roll according to  claim 17 , said intermediate material being one of an embossed paper, a structured paper and a cardboard. 
     
     
         29 . The glass roll according to  claim 17 , said at least one glass film having a thickness of a maximum of approximately 350 μm. 
     
     
         30 . The glass roll according to  claim 17 , said thickness of said at least one glass film being at least 5 μm. 
     
     
         31 . The glass roll according to  claim 17 , said at least one glass film having two sides, each said side defining a surface, at least one of said two sides having a fire polished surface. 
     
     
         32 . The glass roll according to  claim 17 , said at least one glass film having on at least one said surface a root mean square average of a maximum of approximately 1 nm. 
     
     
         33 . The glass roll according to  claim 17 , said at least one glass film having on at least one said surface an average surface roughness of a maximum of approximately 2 nm. 
     
     
         34 . The glass roll according to  claim 17 , wherein said at least one glass film is coated on at least one of said two sides with a plastic layer. 
     
     
         35 . The glass roll according to  claim 34 , said plastic layer providing said intermediate material. 
     
     
         36 . The glass roll according to  claim 17 , said intermediate material including a plurality of material layers. 
     
     
         37 . The glass roll according to  claim 36 , said material layers having a plurality of different widths. 
     
     
         38 . The glass roll according to  claim 17 , said intermediate material layers protruding laterally over said glass film layers. 
     
     
         39 . The glass roll according to  claim 17 , said glass film layers being held in place by a force acting between said glass film layers and said intermediate material layers, said force including at least one of:
 a static friction in a range of between 0.15 and 10 Newtons (N); and   a frictional force in a range of between 0.15 and 5 N.   
     
     
         40 . The glass roll according to  claim 17 , wherein a pre-stress force (FV) is selected such that friction (FF) is greater than a force of weight (FG) of said wound roll using a plurality of parameters of said at least one glass film including:
 a material width (b);   a roll radius (r);   a thickness (t1);   a thickness of said intermediate layers (t2);   a coefficient of friction (μ);   a glass density (p); and   a known number (n) of wound layers of said at least one glass film.   
     
     
         41 . A method of producing a glass roll, the method comprising the steps of:
 providing a glass film, a winding core and a compressible intermediate material;   winding at least one inside layer of said compressible intermediate material onto said winding core;   winding said glass film and said compressible intermediate material onto said winding core such that said glass film is wound onto said winding core in a plurality of alternating layers with said intermediate material, at least one of said intermediate material and said glass film being wound at a tensile stress acting in a longitudinal direction causing a compression of said intermediate material; and   holding an end of said glass film in place on the glass roll.   
     
     
         42 . The method according to  claim 41 , said glass film end being held in place by at least one outer layer of said intermediate material. 
     
     
         43 . The method according to  claim 41 , said compressible intermediate material wound onto said winding core alternatingly in at least two layers, said glass film layers being held in place by said intermediate material layers.