Method, device and semi-finished product for producing prepared roofing for renewing rooves

Abstract

The invention relates to a method for producing prepared roofing for renewing rooves, comprising a glass-nonwoven based planar structure ( 1 ) containing cavities ( 2, 3, 4, 5, 6, 7 ) spaced at intervals, which is laminated with a bitumen-based planar structure ( 10 ), a plastic film ( 8 ) being interposed between said structures. Said method is characterised in that the plastic film ( 8 ) is applied in a first step to a glass-nonwoven based planar structure ( 1 ) that has a mineral coating on one flat surface, by the application of molten plastic during an extrusion coating process to the opposite flat surface from the surface with the mineral coating. In a subsequent step, the bitumen-based planar structure ( 10 ) is laminated onto the surface of the glass-nonwoven based planar structure ( 1 ) that faces towards the applied plastic film ( 8) . This permits a cost-effective production. The invention also relates to appropriate embodiments of the method, to a device for carrying out the method and to a semi-finished product for producing the prepared roofing for renewing rooves.

1 . A method of producing a renovation roof covering ( 11 ) with vapor pressure compensating devices, comprising a nonwoven glass cloth-based planar structure ( 1 ) which is laminated on to a bitumen-based planar structure ( 11 ) with the interposition of a plastic film ( 8 ) and which has openings ( 2 ,  3 ,  4 ,  5 ,  6 ,  7 ) which are arranged distributed at spacings and extending from one flat side to the other, characterised in that a mineral coating ( 9 ) is applied to the one flat side of the nonwoven glass cloth-based planar structure ( 1 ) and the plastic film ( 8 ) is applied to the other flat side of the nonwoven glass cloth-based planar structure ( 1 ) provided with openings, by the application of plastic material in the molten condition in an extrusion coating process, and that the bitumen-based planar structure ( 10 ) is laminated on to the side of the nonwoven glass cloth-based planar structure ( 1 ), that is towards the applied plastic film ( 8 ).  
     
     
         2 . A method as set forth in  claim 1  characterised in that during application of the plastic film ( 8 ) by applying plastic material in the molten condition in the extrusion coating process to the planar structure ( 1 ) provided with openings the pressing pressure applied to the side opposite to the side at which the plastic material is applied is of such a value that no applied plastic material is pressed through the openings ( 2 ,  3 ,  4 ,  5 ,  6 ,  7 ).  
     
     
         3 . A method as set forth in  claim 1  or  claim 2  characterised in that the plastic film which is to be applied in the molten condition in the extrusion coating process is applied projecting beyond the planar structure ( 1 ) at one longitudinal side or at both longitudinal sides (preferably about 15 cm).  
     
     
         4 . A method as set forth in one of claims  1  through  3  characterised in that a polyethylene layer of a weight in relation to surface area approximately in the range between 15 g/m 2  and 50 g/m 2  is applied to the planar structure provided with openings.  
     
     
         5 . A method as set forth in one of claims  1  through  4  characterised in that the density of the polyethylene applied in the extrusion process is approximately in the range of between 0.915 g/cm 3  and 0.960 g/cm 3 .  
     
     
         6 . A device for carrying out the method as set forth in one of claims  1  through  5  characterised in that the pressing roller of a laminating apparatus used in the extrusion coating process has a nonstick coating.  
     
     
         7 . A device as set forth in  claim 6  characterised in that the pressing roller is in the form of a rubber roller covered over with a polytetrafluoroethylene-based tube.  
     
     
         8 . A device as set forth in  claim 6  characterised in that the pressing roller is in the form of a rubber roller with a polytetrafluoroethylene-based band glued thereover.  
     
     
         9 . A semifinished product for producing a renovation roof covering ( 11 ) for renovating existing roof covers ( 12 ) or the like, preferably for use in a method as set forth in one of claims  1  through  5 , comprising a first material web portion which forms the semifinished product and which has a nonwoven glass cloth-based planar structure ( 1 ) with openings ( 2 ,  3 ,  4 ,  5 ,  6 ,  7 ) which are arranged distributed at spacings and which extend through the planar structure ( 1 ) from one flat side thereof to the other, to the one flat side of which, for providing the renovation roof covering, a second material web portion in the form of a bitumen-based planar structure ( 10 ) is fixedly joined, with the interposition of a plastic film ( 8 ), characterised in that the plastic film ( 8 ) is fixedly applied to a flat side of the nonwoven glass cloth-based planar structure ( 1 ), preferably by applying plastic material in the molten condition in an extrusion coating process.  
     
     
         10 . A semifinished product as set forth in  claim 9  characterised in that the flat side opposite to the flat side of the planar structure ( 1 ) with plastic film ( 8 ) applied thereto has a mineral coating.  
     
     
         11 . A semifinished product as set forth in  claim 9  or  claim 10  characterised in that the plastic film ( 8 ) projects beyond at least one side edge of the nonwoven glass cloth-based planar structure ( 1 ).