Sandwich panel and method for producing such a panel

Abstract

A panel possessing mutually averted panel surfaces and a periphery which delimits the panel surfaces is made up of a series of elongated core elements positioned parallel to one another, as well as material strips which are affixed to the core elements and which each extend between respectively two neighboring core elements and along both panel surfaces. Such a panel can expediently be constructed by placing a number of core elements and strips of flexible material side by side, or by stacking these one upon the other.

1 . A panel having mutually averted panel surfaces and a periphery which delimits the panel surfaces, comprising a series of parallelly positioned, elongated core elements ( 1 ,  1 ′,  1 ″, . . . ), as well as material strips ( 2 ,  2 ′,  2 ″, . . . ) which each comprise a portion located between respectively two neighboring core elements and at least one portion extending along one of the panel surfaces, characterized in that those portions of the material strips which extend along the panel surfaces extend over a plurality of core elements. 
     
     
         2 . The panel as claimed in  claim 1 , wherein material strips comprise a portion extending over one neighboring element and along one panel surface, as well as a portion extending over the other neighboring core element and along the other panel surface. 
     
     
         3 . The panel as claimed in  claim 1 , wherein material strips extend over one and the same neighboring element and along both panel surfaces. 
     
     
         4 . The panel as claimed in  claim 1 , wherein material strips comprise a portion located between two neighboring core elements and extending only over a portion of these core elements, as well as a portion extending only along a panel surface. 
     
     
         5 . The panel as claimed in  claim 4 , wherein core elements close to both panel surfaces are provided with material strips, which comprise a portion located between two neighboring core elements and extending only over a portion of these core elements, as well as a portion extending only along a panel surface. 
     
     
         6 . The panel as claimed in  claim 5 , wherein those portions of two material strips which extend between respectively two neighboring core elements are overlapped by a connecting strip located between these core elements. 
     
     
         7 . The panel as claimed in  claim 1 , wherein the core elements possess a square or rectangular cross section. 
     
     
         8 . The panel as claimed in  claim 1 , wherein the core elements possess a triangular cross section. 
     
     
         9 . The panel as claimed in  claim 1 , wherein the core elements contain material strips, such as in the form of a sinusoidal corrugated plate or an omega-shaped profiled plate. 
     
     
         10 . The panel as claimed in  claim 1 , wherein the material strips are affixed to each other with a hardened impregnating agent. 
     
     
         11 . A method for producing a panel as claimed in  claim 2 , comprising the following steps:
 the provision of a core element ( 1 ),   the covering of this core element ( 1 ) with a strip of impregnable flexible material ( 2 ) which continues transversely to the longitudinal direction of the core element ( 1 ) to beyond this core element ( 1 ),   the provision of a following core element ( 1 ′) alongside the preceding covered core element ( 1 ) and on that portion ( 11 ) of the strip of flexible material ( 2 ) covering this preceding core element ( 1 ) which is continued beyond the preceding core element ( 1 ),   the covering of the following core element ( 1 ′) with a following strip of flexible material ( 2 ′) which continues transversely to the longitudinal direction of the following core element ( 1 ′) to beyond this following core element ( 1 ′),   the at least single repetition of the step of providing a following core element ( 1 ″), the step of placing this following core element ( 1 ″) alongside a preceding covered core element ( 1 ′) and on that portion ( 11 ′) of the preceding strip of flexible material ( 2 ′) covering the preceding core element ( 1 ′) which is continued beyond the preceding core element ( 1 ′), as well as the step of covering the following core element ( 1 ″) with a following strip of flexible material ( 2 ″) which continues transversely to the longitudinal direction of the following core element ( 1 ″) to beyond this following core element ( 1 ″),   the impregnation of the strips of material ( 2 ,  2 ′,  2 ″, . . . ) with a hardenable fluid,   the hardening of the impregnated strips of material ( 2 ,  2 ′,  2 ″, . . . ),   characterized by:
 the fitting of the following strip of flexible material ( 2 ′) over the top face ( 5 ′) of a following core element ( 1 ′), as well as over the preceding strip of flexible material ( 2 ) extending over the top face ( 5 ) of a preceding core element ( 1 ). 
   
     
     
         12 . The method for producing a panel as claimed in  claim 11 , comprising the following steps:
 the positioning of a core element ( 1 ) in a template ( 4 ),   the fitting of a strip of impregnable flexible material ( 2 ) over the top face ( 5 ) and a side face ( 6 ) of the core element ( 1 ), as well as over that bottom portion ( 3 ) of the template ( 4 ) which adjoins this side face ( 6 ),   the positioning of a following core element ( 1 ′) in the template ( 4 ) against the flexible material ( 2 ,  10 ) which covers said side face ( 6 ) of said core element ( 1 ) and on the flexible material ( 2 ,  11 ) which covers said bottom portion ( 7 ),   the fitting of a following strip of flexible material ( 2 ′) over the top face ( 5 ′) and a side face ( 6 ′) of the following core element ( 1 ′), as well as over that bottom portion ( 3 ) of the template ( 4 ) which adjoins this side face ( 6 ′),   the repetition of the positioning of a following core element ( 1 ″) and a following strip of flexible material ( 2 ″) until the desired number of core elements ( 1 ,  1 ′,  1 ″, . . . ) alongside one another is obtained,   the impregnation of the strips of flexible material ( 2 ,  2 ′,  2 ″, . . . ) with a hardenable fluid,   the hardening of the hardenable fluid, with formation of the plate girder.   
     
     
         13 . The method as claimed in  claim 11 , comprising the step of:
 fitting the following strip of flexible material ( 2 ′) over the preceding strip of flexible material ( 2 ) extending from a preceding core element ( 1 ) under the bottom face ( 8 ′) and past the side face ( 6 ′) of the following core element ( 1 ′).   
     
     
         14 . The method as claimed in  claim 11 , comprising the step of using tubular core elements ( 1 ). 
     
     
         15 . The method as claimed in  claim 11 , comprising the steps of using strips of flexible material which comprise a fabric, and of aligning the threads in the longitudinal direction of the core elements. 
     
     
         16 . The method as claimed in  claim 11 , comprising the steps of using strips of flexible material which comprise a fabric, and of aligning the threads of the fabric in the transverse direction of the core elements. 
     
     
         17 . The method as claimed in  claim 11 , comprising the step of impregnating the flexible material under vacuum. 
     
     
         18 . The method as claimed in  claim 11 , comprising the following steps:
 the fitting of a strip of flexible material,   directly following the fitting of this strip of flexible material, the impregnation thereof,   the subsequent fitting of a following core element,   the fitting of a following strip of flexible material,   directly following the fitting of this strip of flexible material, the impregnation thereof.   
     
     
         19 . A method for producing a panel as claimed in  claim 1 , comprising the following steps:
 the provision of a core element ( 1 ),   the covering of this core element ( 1 ) with a strip of impregnable flexible material ( 2 ) which continues transversely to the longitudinal direction of the core element ( 1 ) to beyond this core element ( 1 ),   the provision of a following core element ( 1 ′) on the preceding covered core element ( 1 ) and on the preceding strip of flexible material ( 2 ),   the covering of the following core element ( 1 ′) with a following strip of flexible material ( 2 ′) which continues transversely to the longitudinal direction of this following core element ( 1 ′) to beyond this following core element ( 1 ′),   the at least single repetition of the step of providing a following core element ( 1 ″), the step of placing this following core element ( 1 ″) on a preceding core element and a preceding strip of flexible material ( 2 ′) covering the preceding core element ( 1 ′), as well as the step of covering the following core element ( 1 ″) with a following strip of flexible material ( 2 ″) which continues transversely to the longitudinal direction of the following core element ( 1 ″) to beyond this following core element ( 1 ″), with formation of a stack ( 12 ) of core elements ( 1 ,  1 ′,  1 ″, . . . ) and intervening parts ( 10 ,  10 ′,  10 ″, . . . ) of the strips of flexible material ( 2 ,  2 ′,  2 ″, . . . ),   the abutment of those parts ( 9 ,  9 ′,  9 ″, . . . ,  11 ,  11 ′,  11 ″, . . . ) of the strips of flexible material ( 2 ,  2 ′,  2 ″, . . . ) which extend to beyond the stack ( 12 ) against this stack ( 12 ),   the impregnation of the strips of material ( 2 ,  2 ′,  2 ″, . . . ) with a hardenable fluid,   the hardening of the impregnated strips of material ( 2 ,  2 ′,  2 ″, . . . ) into an end product ( 14 ),   characterized by:
 the fitting of the following strip of flexible material ( 2 ′) over a following core element ( 1 ′), as well as over the preceding strip of flexible material ( 2 ) extending over a preceding core element ( 1 ). 
   
     
     
         20 . The method as claimed in  claim 19 , comprising the following steps:
 the provision of a template ( 13 ), the internal shape of which conforms to the contour of the end product ( 14 ) to be produced,   the placement of the template ( 13 ) over the stack ( 12 ) and those parts ( 9 ,  9 ′,  9 ″, . . . ,  11 ,  11 ′,  11 ″, . . . ) of the strips of flexible material ( 2 ,  2 ′,  2 ″, . . . ) which extend relative to this stack ( 12 ),   the hardening of the impregnated strips of material ( 2 ,  2 ′,  2 ″, . . . ) while the template ( 13 ) is in position over the stack ( 12 ).