Nov 09, 2013· Mechanical pulping • GrindingStone Groundwood (SGW) – Logs (very occasionally chips) are pressed into a turning stone thus releasing fibers. 19. Ground wood • The bark is removed from the logs. • Then, the cut logs are forced by hydraulic or steam pressure against a revolving grinding stone in the presence of water.
Topic 3 – Mechanical Pulping James A. Olson Pulp and Paper Centre, Department of Mechanical ... Stone Groundwood (SGW) Pulp produced by pressing logs against rotating grindstone Unchanged for 150 years. 8 Action of grinder Circumferential speed 30 m/s Grinding pressure 250kPa Grits deform fibrelignin matrix Repeated viscoelastic deformation ...
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the grinding action of the disks separates the wood fibers. Water is used to cool the disks and wash away the fibers. Disk refiners are also commonly used to grind peanuts into peanut butter and corn into flour. Another common mechanical process for making newspaper is called stone groundwood (SGW). Logs are ground against a large rotating ...
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In groundwood (GW) mechanical pulping, wood logs or bolts are pressed against a revolving grinding stone, and fibers and fiber fragments are separated by abrasion. Pulp characteristics are influenced by the stone surface characteristics, stone surface speed, energy consumption, temperature, and pulp consistency in the grinder.
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"Perspectives on high and low consistency refining in mechanical pulp," BioRes. 10(4), ... Perspectives on High and Low Consistency Refining in Mechanical Pulping. ... The development of stone ground wood (SGW) pulping in Germany in the 1850's, followed by sulphite pulping about 10 years later, paved the way for the widespread use of wood ...
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Fibre Development during Stone Grinding; Ultrastr, Stone groundwood (SGW) pulping is an important mechanical pulping process particularly in Scandinavia and more recently is increasing in, Four different wood types (1, 5, 6, 7; Table 1) were selected for the grinding experiments and were.
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Overview of Pulp and Paper Technology 1 1 The Impact of Clothing ... Stone groundwood (SGW) and thermomechanical FIGURE Schematic of wood pulp (chemical) and paper manufacturing (TAPPI, [2]). ... In the historical but now obsolete stone grinding method, barked logs are pressed sideways against a rotating grinding stone (Figure ). ...