Sheet Formation

Formation is a property of the sheet that is based on the overall uniformity of the fiber distribution in the sheet. Sheet formation is important because it affects both the appearance and the performance of paper and board products. At the end of this module, you will be able to identify three mechanisms available to minimize flocculation and describe the differences between mechanical and chemical fibers related to fiber length, refining response and sheet strength.

•Define "formation" and "floc" •Identify three mechanisms available to minimize flocculation •Describe the differences between mechanical and chemical fibers related to fiber length, refining response and sheet strength •Describe how the stock delivery system affects sheet formation •Identify headbox components which create turbulence and keep fibers dispersed •List the three directions of fiber orientation in a sheet of paper or board •Define "jet-to-wire ratio" and "rush/drag" •Describe the terms "rushing" and "dragging" •Describe how common chemical additives can affect sheet formation •Describe how forming section components can affect sheet formation