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The difference between the flow-on method and the screen tank production method is in the process of material production on the felt. The concentration of watery materials in this machine is higher and the solid containments of watery materials is more which are directly transferred through the transfer mechanism.

Advantages in comparison to screening tank:

  • The production machinery is simpler and requires less investment.
  • The volume of returned water is lower and the machinery is simpler and takes less space
  • Watery material can form with any kind of accessible fiber and material and there is no special treatment required for keeping the fiber
  • and the matrix on the felt. This is why the production is without complication and easy to do.

Disadvantages of this machine:

  • The vertical and horizontal distribution of fibers is not done properly compared to the screen tank method.
  • Due to the fact that in this machine the layers of the product are less than the screen tank method the strength of products produced in this method are less than products produced by screen tank method.
  • High risk of layer separation due to bigger layer thickness and less resistance against bad geographic situation compared to products produced by screen tank.
  • The production volume is lower than the dual screen tank.
  • High risk of density difference in sheet.

These are the reasons that few fiber cement producers use these method although its simpler.

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Cement boards, after completing grasping and curing process, have higher moister than the environment and after being exposed to the dryer, loose some of their moister and have a minor shrinkage and a minor reduction in their dimension like most construction material. So if the cement boards are not properly dried or in other words, their moister has not been reduced enough, after being installed in the structure and being exposed to the fresh air; lose some of their moister and the wrenches attached to the boards cause shrinkage or convexity or concave. This can cause internal tension and lead to cement board rapture from the wrench installation points and cause fracture from the edges of the board.

This is why the cement boards need to be dried and have their moister reduced to an acceptable amount to stop this flaw from happening.

Considering this problem baverce co. has designed, manufactured and launched an oven dryer to place its productions in before delivering it to the customers to prevent such problems occurring before installation.

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Today with the development of building technology, using precast materials, according to high possibility of quality control and construction speed, is more welcomed by people more than past. One of this precast materials that is used in inner surface and facade is Fiber Cement Board. According to high flexural strength of Fiber Cement Board, it is used in interior and exterior façade and walls, floor and roof covers.

Fiber Cement Boards have High resistance to fire, they are good sound & heat insulations and waterproofed. Comparing to similar products, Fiber Cement Boards have more resistance to absorption and moisture passage. Although in submerge condition they absorb water and their flexural strength decrease, but after being dried, without any size deformation, the original flexural strength is back,According to the fact that are so smooth, after installation, without being finished, they can be colored, wallpapered or any PVC cover & HPL plate.In the following, you can see the production process
Uses of Fiber Cement Boards:
1-interior cover of building:

Lining inside walls:
Fiber Cement Boards with a density up to 1600 Kg/m^3 could be used in internal space of the building and cover. Due to the high impact resistance of this product and suitable mechanical properties, it could be used in walls of a busy place.According to different varieties in design and colors, the Fiber Cement Boards can be used as décor walls or final covers (without being colored) in offices, residential and business places.Substructure of tile and ceramic in toilets, pools, and very wet locations:According to high water proofing of Fiber Cement Boards and strong adhesion to mortars and tile bonding layers, it could be used as Drywall`s covers in such places.Stepped ceilings:In offices, residential and business places and also wet places like pools and which are possible to humidity or steam contact Fiber Cement Board can be used as stepped ceiling in the form of 60*60 tiles or decorative.
2-dry wall Fiber Cement Board:
Is dry wall with fiber cement plate cover without asbestos or Fiber Cement Board that can be used as interior or exterior walls along with facade. There is no need to use traditional material in the wall.Components in dry wall Fiber Cement Board:
1-Ultimate external cover: Acrylic water based color, textured cover.
2-External cover: Fiber Cement Board due to covering external wall and façade simultaneously.3-
Cushioning4
thermal and sound insulation, water and steam barrier5-Polyurethane insulation, rock wool, poly styrene (heat and sound insulation), water barrier (exterior strap with a one-way layer like tie walk), vapor barrier (internal vapor strap with a normal nylon layer)6-Interior cover: Fiber Cement Board, gypsum board, robiits Plus spray gypsum7-Ultimate interior cover: Acrylic water based color, plastic or oil color, wall paperRun the Fiber Cement BoardAccording to the way of using Fiber Cement Board, which is used as covering or dry wall and well defined in previous sections, the way of running is as following:1-Running dry wall system:in this system, because of in-plane stiffness, if it is executed  as the Seismic performance of the building will not changes in main. Dry wall system contains horizontal and vertical parts as cold rolled steel sheet. Horizontal parts (runners) are installed on two levels, one on the floor and the other one on the ceiling, by hilty nail or screw; and then, The vertical parts (stadia) depending on wall and building’s usage are placed on runners at standard distances. In structuring walls, the stadia is not screwed in runners, but has a free space to play???? , and the connection type is by screwing Fiber Cement Board’s panels. This type of flexible connection between fiber cement board and stadia & runner is will reduce the earthquake force and while the earthquake happens there will not be any extra pressure or reaction force on the structure and it will not affect the seismic behavior of the building. After that structuring is completed, Fiber Cement Board plates are installed on the structure by screw. If needed, seal materials like rock wool, glass wool and poly styrene will be used between Fiber Cement Board’s plates.

2-Introducing Fiber Cement Board wall system:

Fiber Cement Board wall is designed to solve the traditional wall’s problems and complete dry wall’s system. This system, in addition to quick construction and mechanical connection to the building and structure, is stronger than dry installation of similar system and doesn’t have problems such as hollow sound, unsafety, insects penetration in the free space of the wall and…. Fiber Cement Board wall consisted of galvanized stadia runners, are connected to the ceiling and roof by hilty or nails and after placement of mechanical and electrical installations, both side of the wall is covered by Fiber Cement Board. After the Fiber Cement Boards are installed, light weight concrete mixed with cement, granule poly styrene and additives is injected into the wall and at the end the seam between Fiber Cement Board, is covered by sealing and the result is a high quality wall prepared for color or any other polishing.

3-implacemment of the cement board façade (cement board on the façade):
3-1-metall fitting:


Implacemment of the vertical element (wall post) of 40*80 can:Because in most of the buildings curtain walls are made of light materials and beams of the classes are the only structural connection points, wall post is used to make connection between horizontal elements; and because full weight of the facade is on the structure, 40*80 can or the right element -depending on the designer’s calculations- is used.Implacemment of the horizontal element from 40*40 can:Because V&M galvanized profiles are placed vertically, horizontal elements from 40*40 cans are performed on wall posts up to 150 vertically distances. It is necessary to mention that implementing the horizontal elements as a crossroad will help align the substructure.

3-2-Galvanized substructure
:

M galvanized profile: This profile is made from galvanized sheet a thickness of 7 millimeter; and for dimensional control of Fiber Cement Board panels that is made due to moisture changes, is used. This profile is placed between two Fiber Cement Board panels. If this profile is used, seam between panels will remains visible; for covering this steam, A galvanized profile can be used. This profile connects to the metal substructure from the middle part, only by a screw.V galvanized profile: This profile is made from galvanized sheet a thickness of 7 millimeter and is used with M galvanized profile in modular and siding Fiber Cement Board façade’s substructure. According to the fact that the price of this structure is significantly lower than M profile, using this profile will reduce cost of substructure. This profile is screwed to the metal substructure from two sides.
3-3- Installing Fiber Cement Board
Running waterproof insulation (sealer) behind the panels:  Because Fiber Cement Board is totally made by cement, has good compatibility with water and wet environment, but because of using cement in combination and the property of absorbing water when saturated with moisture (directly, with vapor or humidity in the air) expands and when dried, contracts; and tension caused by increasing and decreasing length will cause problems on the connection points (screwed points).  To avoid this problem a special sealer behind the Fiber Cement Board’s panels is used and on the Fiber Cement Board’s panels primer and color will do this duty, to minimize moister absorption.You can also find out more about the installation of eyvanit’s Sheets
Cut in specific dimensions:
Fiber Cement Boards must be cut by cutting table machine to avoid non-homogenization and unbounding cutting location. Avoid cutting by milling machine. Granite blades are suitable for cutting this stuff and other sheets cannot be used.
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