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The different processes used influence pulp quality and are usually specified: groundwood (or stone groundwood) (SGW); pressure groundwood (PGW), similar to the SGW except that it is carried out at higher temperature and higher than atmospheric pressure; refiner mechanical pulp (RMP); or thermomechanical pulp (TMP), also a refined pulp, which has largely replaced RMP, carried out at higher temperatures and atmospheric pressures using steam preheating of chips. |
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