Paper is made from wood pulp. Wood pulp is made from wood chips by either cooking it with chemicals (called Kraft pulp) or grinding the wood chips into its fibres (called Thermo-mechanical pulp). Pulp is cleaned and possibly bleached before papermaking. If one were to make paper at home, the following process could be used:
“The pulp is poured into a large tub and the fibres are suspended in the water. A framed screen is dipped into the water and is lifted to the surface, catching the fibres onto the screen. The screen can either be left in the sun to dry, or be transferred to boards, pressed, smoothed and then dried.”7
Design a continuous process for mass producing paper. Assume pulp has already been made. Draw the process flow diagram.