Patent Publication Number: US-2011047913-A1

Title: Exterior Cement Panel

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to an exterior cement panel. More particularly, this invention relates to an exterior cement panel that provides strong and light board for construction material. 
     Conventional cement board may be hard, but brittle to pointed shock or force. Also, the cement board is usually very heavy. 
     SUMMARY OF THE INVENTION 
     The present invention contrives to solve the disadvantages of the prior art. 
     An objective of the invention is to provide an exterior cement panel that is strong and light. 
     Another objective of the invention is to provide an exterior cement panel that is resistant to fire and deterioration. 
     In order to achieve the above objectives, the invention provides an exterior cement panel. 
     The exterior cement panel comprises a cement block portion, a plurality of fiber glass mesh layers, and a plurality of wood sliver layers. 
     The cement block portion comprises plastic cement, forming approximately 20 percent of the exterior cement panel in volume. 
     The plurality of fiber glass mesh layers are embedded in the cement block portion. 
     The plurality of wood sliver layers are embedded in the cement block portion and sandwiched with the plurality of fiber glass mesh layers, forming approximately 80 percent of the exterior cement panel in volume. 
     The plurality of wood sliver layers are treated with preservative and fire-retardant. 
     The plastic cement may comprise about 80 percent of cement and 20 percent of coal ash or chalkstone power. 
     Each of the plurality of wood sliver layers may comprise a plurality of wood slivers. The wood sliver may have a needle shape. The plurality of wood slivers may be overlapped and pressed to form an irregular mesh on a given plane. The wood sliver may have a length which is much larger than the thickness. 
     Each of the fiber glass mesh layers may comprise a plurality of fiber glass threads. The plurality of fiber glass threads may be disposed crisscrossed with one another to form a mesh. 
     The wood sliver may comprise hard wood and bamboo, and the hardwood may comprise oak. 
     The exterior cement panel may further comprise a plurality of stainless steel screens, and the plurality of stainless steel screens may be disposed with a predetermined interval. 
     Another aspect of the invention provides a method for manufacturing an exterior cement panel. 
     The method comprises steps of providing a fiber glass screen; providing a wood sliver layer by cutting wood slivers out of wood, immersing the wood slivers in preservative and fire-retardant, and drying; attaching the wood sliver layer to the fiber glass screen; applying at least one layer of plastic cement to the attached wood sliver layer and fiber glass screen; hardening the wood sliver layer and the fiber glass screen embedded in the at least one layer of cement (a pressed board) under pressure; and curing the pressed board in steam of about 200 degrees in Celsius. 
     The wood may comprise a hard wood and bamboo, and wherein the hard wood comprises oak. The wood may comprise strong fibers. 
     The wood sliver may have a needle shape. 
     The plastic cement may comprise about 80 percent of cement and about 20 percent of coal ash or chalkstone power. 
     The method may further comprise a step of inserting one or more stainless steel screen with predetermined intervals. 
     Still another aspect of the invention provides an exterior cement panel. 
     The exterior cement panel comprises a cement block portion, one or two fiber glass mesh layers, a plurality of wood sliver layers, and one stainless steel screen. 
     The cement block portion comprises plastic cement, forming approximately 20 percent of the exterior cement panel in volume. 
     The one or two fiber glass mesh layers are embedded in the cement block portion. 
     The plurality of wood sliver layers are embedded in the cement block portion and sandwiched with the plurality of fiber glass mesh layers, forming approximately 80 percent of the exterior cement panel in volume. 
     The one stainless steel screen is disposed by or between the one or two fiber glass mesh layers. 
     The plurality of wood sliver layers are treated with preservative and fire-retardant. 
     The exterior cement panel has a thickness of about ¾ inches. 
     In certain embodiments of the invention, the plastic cement may comprise a plurality of fiber glass threads like the pieces of wood sliver layers. 
     In certain embodiments of the invention, the plastic cement comprises concrete glue or glue and ammonium bichromate. 
     The advantages of the present invention are: (1) the exterior cement panel can be manufactured easily; (2) the exterior cement panel is strong and light; (3) the exterior cement panel is resistant to fire and deterioration. 
     Although the present invention is briefly summarized, the fuller understanding of the invention can be obtained by the following drawings, detailed description and appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       These and other features, aspects and advantages of the present invention will become better understood with reference to the accompanying drawings, wherein: 
         FIG. 1  is a partially exploded perspective view showing an exterior cement panel according to an embodiment of the invention; 
         FIG. 2  is a cross-sectional view of an exterior cement panel according to another embodiment of the invention according to the invention; 
         FIG. 3  is a cross-sectional view of an exterior cement panel according to still another embodiment of the invention according to the invention; and 
         FIG. 4  is a flowchart showing a method of manufacturing an exterior cement panel according to an embodiment of the invention. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       FIGS. 1-3  show exterior cement panels  100 , and  FIG. 4  shows a flowchart showing a method of manufacturing an exterior cement panel. 
     In order to achieve the above objectives, the present invention provides the exterior cement panel  100 . 
     The exterior cement panel comprises a cement block portion  10 , a plurality of fiber glass mesh layers  20 , and a plurality of wood sliver layers  30 . 
     The cement block portion  10  comprises plastic cement, forming approximately 20 percent of the exterior cement panel  100  in volume. 
     The plurality of fiber glass mesh layers  20  are embedded in the cement block portion  10 . 
     The plurality of wood sliver layers  30  are embedded in the cement block portion  10  and sandwiched with the plurality of fiber glass mesh layers  20 , forming approximately 80 percent of the exterior cement panel  100  in volume. Since it consists of about eighty percent of the exterior cement panel  100 , its thickness is much larger than the fiber glass mesh layers  20  as shown in  FIG. 2 . Therefore, even thought the plurality of fiber glass mesh layers  20  and the plurality of wood sliver layers  30  are embedded in the cement block portion  10 , it can be said that the cement block portion  10  is filling the space in the plurality of fiber glass mesh layers  20  and the plurality of wood sliver layers  30 . 
     The plurality of wood sliver layers  30  are treated with preservative and fire-retardant, so as to prevent termite from eating out the wood slivers and to keep the wooden parts from catching fire. 
     In certain embodiments of the invention, the plastic cement may comprise about 80 percent of cement and 20 percent of coal ash or chalkstone power. 
     Each of the plurality of wood sliver layers  30  may comprise a plurality of wood slivers. The wood sliver may have a needle shape. The plurality of wood slivers may be overlapped and pressed to form an irregular mesh on a given plane. The wood sliver may have a length which is much larger than the thickness. Such a shape of long fiber or string facilitates holding the exterior cement panel  100 . 
     Each of the fiber glass mesh layers  20  may comprise a plurality of fiber glass threads. The plurality of fiber glass threads may be disposed crisscrossed with one another to form a mesh. 
     The wood sliver may comprise hard wood and bamboo, and the hardwood may comprise oak, which have strong fibers strengthening the exterior cement panel  100 . 
     The exterior cement panel  100  may further comprise a plurality of stainless steel screens  40  as shown in  FIGS. 1 and 3 , and the plurality of stainless steel screens  40  may be disposed with a predetermined interval. It gives extra strength to the exterior cement panel  100 . 
     Another aspect of the invention provides a method for manufacturing an exterior cement panel  100  as shown in  FIG. 4 . 
     The method comprises steps of providing a fiber glass screen (S 100 ); providing a wood sliver layer by cutting wood slivers out of wood, immersing the wood slivers in preservative and fire-retardant, and drying (S 200 ); attaching the wood sliver layer to the fiber glass screen (S 300 ); applying at least one layer of plastic cement to the attached wood sliver layer and fiber glass screen (S 400 ); hardening the wood sliver layer and the fiber glass screen embedded in the at least one layer of cement (a pressed board) under pressure (S 500 ); and curing the pressed board in steam of about 200 degrees in Celsius (S 600 ). 
     The wood may comprise a hard wood and bamboo, and wherein the hard wood comprises oak. The wood may comprise strong fibers. 
     The wood sliver may have a needle shape. 
     The plastic cement may comprise about 80 percent of cement and about 20 percent of coal ash or chalkstone power. 
     The method may further comprise a step of inserting one or more stainless steel screen with predetermined intervals. 
     Still another aspect of the invention provides an exterior cement panel  100 . 
     The exterior cement panel  100  comprises a cement block portion  10 , one or two fiber glass mesh layers  20 , a plurality of wood sliver layers  30 , and one stainless steel screen  40  as shown in  FIGS. 1 and 3 . 
     The cement block portion  10  comprises plastic cement, forming approximately 20 percent of the exterior cement panel in volume. 
     The one or two fiber glass mesh layers  20  are embedded in the cement block portion  10 . 
     The plurality of wood sliver layers  30  are embedded in the cement block portion  10  and sandwiched with the plurality of fiber glass mesh layers  20 , forming approximately 80 percent of the exterior cement panel  100  in volume. 
     The one stainless steel screen  40  is disposed by or between the one or two fiber glass mesh layers  20 . 
     The plurality of wood sliver layers  30  are treated with preservative and fire-retardant. 
     The exterior cement panel  100  has a thickness of about ¾ inches. 
     In certain embodiments of the invention, the plastic cement may comprise a plurality of fiber glass threads like the pieces of wood sliver layers. 
     In certain embodiments of the invention, the plastic cement comprises concrete glue or glue and ammonium bichromate. 
     While the invention has been shown and described with reference to different embodiments thereof, it will be appreciated by those skilled in the art that variations in form, detail, compositions and operation may be made without departing from the spirit and scope of the invention as defined by the accompanying claims.