What is Fiber Cement Board Felt?

Fiber Cement Board Felt

Fiber cement board felt is used for making fiber cement board, the structure of fiber cement board felt is generally same as the paper machine felt are composed by nylon bottom mesh and multi batt layer. The fiber cement board is an inorganic board made of siliceous materials (such as quartz powder, diatomaceous earth, etc.), calcium materials (such as cement, lime), and reinforcing fibers (such as cellulose, glass fiber) as the main raw materials, through pulping, molding, autoclaving and curing processes.

What is the role of felts in the production of Fiber Cement Board?

There are mainly two way for making fiber cement board. They are Hatscheks process method and flow on process method. The fiber cement board felt are (also known as felt cloth, forming fabric) used in the production process of fiber cement board is one of the core components of the Hatschek process production line, which directly affects the forming quality, surface flatness and production efficiency of the board.

The Difference between Hatscheks Process and Flow on Process

The Hatscheks process method has a longer history, relatively mature process equipment, and relatively high productivity, but the material loss is relatively large; the flow on process method is a later developed technology, which mainly changes the process of forming board. The slurry is directly laid on the felt belt through the feed box, and the board are formed through vacuum dehydration. Therefore, the equipment for the forming process of the flow slurry method is relatively simple, but a vacuum dehydration system needs to be added. The material loss of the flow slurry method is relatively small.

The Function of Fiber Cement Board Felt

1.Dehydration and forming: In the Hatscheks process, the slurry is filtered through the mesh to form a continuous wet slab.

2.Fiber distribution: The pore structure of the felt affects the uniform distribution of fibers, avoiding delamination or local strength deficiency.

3.Surface treatment: The texture of the felt affects the fineness of the board surface (such as whether subsequent sanding is required).