During the weaving of forming fabric, monofilaments are composed of paper machine direction and paper machine cross direction. The monofilaments of paper machine direction or lengthwise are called warp. One the other hand the monofilaments of paper machine cross direction are called weft or Shute or filling.
The construction of forming fabric depends on some weaving variables such as pattern, mesh, yarn, diameter, degree of crimping etc. Mesh is very important for a forming fabric. Water drainage and retain of fibers are depends on it.
According to the category, forming fabric (synthetic forming fabric) can be divided into single layer and 1.5 layer forming fabric, double layer and two and a half layer forming fabric, triple layer forming fabric. In accordance with weaving, forming fabric can be divided into 2-shed, 4-shed, 5-shed, 7-shed, 8-shed, 16-shed, 24-shed etc. A paper machine forming fabric has two surfaces. One is the forming surface or top surface and another is the wearing surface or underside surface.
Depending on paper machine and various paper grades forming fabric also difference. The uses of double layer forming fabric is increasing day by day.