Pulp Beating In Paper Making Process



Cellulose fibers must be subjected to mechanical treatmenet before they can be made into paper. This treatment may be applied in a number of different ways, but it ordinarily includes a bruising, rubbing, or crushing action on the fibers. Certain pulps will develop some strength by simply agitating at high speeds with a stirrer, but most pulps require a more vigorous action.
Beating is probably the most fundamentally important process in papermaking. Paper made from unbeaten stock is low instrength, fluffy, porous, and unfit for most use, whereas paper made from beaten stock is strong, dense, and hard in texture. Well-beaten fibers can be readily formed into a uniform sheet of paper of quite high density, whereas unbeaten fibers can not. So the old maxim, "Paper is made in the beater", is still as basically true today as it was over two hundred years ago.
It is now believed that no major chemical changes in the fiber occur during beating, since the X-ray diffraction pattern is not changed. The principle effects of beating are physical, and among the most important are the following: fracture and partial removal of the primary wall of the fiber, decrease in fiber length, increase in fiber flexibility, formation of fibrils(fibrillation), and increase in the external specific surface of the fiber.

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