Representative Papermaking Machines Fourdrinier machines Fourdrinier machines(Figure 3. 1)pump furnish from a headbox directly onto a moving wire screen through which the water is continuously drained. Fourdrinier machines may have a second headbox(Figure 3.2)situated downstream of the first headbox to add further quantities of furnish onto the partially dewatered initial lay-down
Representative Papermaking Machines Fourdrinier Machines Fourdrinier machines (Figure 3.1) pump furnish from a headbox directly onto a moving wire screen through which the water is continuously drained. Fourdrinier machines may have a second headbox (Figure 3.2)situated downstream of the first headbox to add further quantities of furnish onto the partially dewatered initial lay-down
Representative Papermaking Machines ornish headbox Slice Pulp layer Y%38(○ Head roll Table rolls Figure 3.1 Furnish pours out of the headbox of a fourdrinier machine and onto an endless wire or screen where excess water can be drained. the fibers remain trapped on the screen
Representative Papermaking Machines Figure 3.1 Furnish pours out of the headbox of a fourdrinier machine and onto an endless wire or screen where excess water can be drained. The fibers remain trapped on the screen
Representative Papermaking Machines Optional second headbox Headbox Slice To drying cans Pulp inlet o)Table rolls Suction boxes First press Head roll Couch roll Tension contro Figure 3.2 Paper is dewatered at the wet end of a fourdrinier machine
Representative Papermaking Machines Figure 3.2 Paper is dewatered at the wet end of a fourdrinier machine
Representative Papermaking Machines Cylinder Machines A cylinder machine(Figure 3.3 rotates a screen drum in a vat of furnish (The paper is sometimes called vat paper )As the water pours through the screen fiber accumulates on the outside of the screen This thin layer of matted fiber is transferred onto a moving felt belt that passes sequentially over further rotating cylinders, each of which deposits another fiber layer
Representative Papermaking Machines Cylinder Machines A cylinder machine (Figure 3.3) rotates a screen drum in a vat of furnish. (The paper is sometimes called vat paper.) As the water pours through the screen, fiber accumulates on the outside of the screen. This thin layer of matted fiber is transferred onto a moving felt belt that passes sequentially over further rotating cylinders, each of which deposits another fiber layer
Representative Papermaking Machines To next cylinder Felt Pulp layer Rotating screen drum Pulp furnish inlet Figure 3. 3 A single cylinder station on a cylinder-type machine
Representative Papermaking Machines Figure 3.3 A single cylinder station on a cylinder-type machine