Process for the production of reinforced slabs of stone materials and reinforced slabs of stone material
OwnerMarcello Toncelliinventor
Life of this patent
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Abstract
The application of a reinforcing layer to the visible face of slabs of stone material. For slabs of marble and granite, especially thin slabs, the reinforcing layer is constituted by non-twisted glass threads, preferably in the form of a mat, and by a transparent resin resistant to the action of atmospheric and chemical agents. A reinforced slab is obtained which has a small thickness and in which the resistance to negative flexing is greatly increased, along a front face concomitantly with the resistance to positive flexing along the rear, or invisible, face of the slab when the rear face is also reinforced.
Claims21
A process for the production of a reinforced slab of stone material, said slab having an unexposed rear invisible reinforced face and exhibiting decorative properties to provide special esthetic effects and a reinforcement which includes a hardened resin and exposed front visible face having a visible surface area, the front visible face of the slab having a flexural resistance that is between 400 to 800 kg/sq.cm, and the reinforcement and resin not detracting from the special esthetic effects, comprising the steps of:
- providing a layer of reinforcing material comprising a plurality of non-twisted glass threads embedded in a layer of transparent hardenable resin which is resistant to atmospheric agents,
- applying the layer of reinforcing material to the visible surface area of said exposed front face of said slab, wherein the amount of the applied non-twisted glass threads is approximately 100 to 800 grams per square meter of visible surface area of the exposed front face,
- hardening the said resin after applying the layer of reinforcing material to the visible surface area, so that the front visible face of the slab has the flexural resistance that is between 400 to 800 kg/sq.cm, and
- the reinforcement formed by the resin and the non-twisted linear glass reinforcing elements having a percentage ratio by weight of resin to the non-twisted linear reinforcing elements of at most 50:50, whereby to increase the strength from a range of 120 to 180 kg/cm2 to 400,to 800 kg/cm2.
The process according to claim 11, for production of a reinforced slab of stone material having a high resistance to both positive and negative flexing and consisting of three layers, the slab forming one of the three layers, including the step of applying a second reinforcing layer to the rear, invisible face of the slab prior to applying the first-mentioned layer of reinforcing material to the front visible face of the slab, the second layer comprising a resin of the hardening type which is combined with the rear face of the slab, and the first layer coating the non-twisted glass threads is embedded with transparent hardenable resin, the percentage ratio by weight of resin to non-twisted glass threads in said first-mentioned layer being at most 50:50.
A reinforced slab of stone material including a slab of stone material having a visible slab surface area forming a visible exposed front face and a layer of reinforcing material, comprising a reinforcing layer of non-twisted glass threads impregnated with a transparent hardenable resin resistant to atmospheric agents overlying said visible front face of the slab and, the amount of said reinforcing layer is such that there are approximately 100 to 800 g of non-twisted glass threads per square meter of visible surface area of slab exposed front face, and the visible front face of the slab reinforced with the layer of reinforcing material has a flexural resistance between 400 to 800 kg/cm2, and said resin having a percentage ratio by weight of resin to said layer of reinforcing material of at most 50:50.
Dependencies are inferred from the claim text.