PURPOSE: To provide a head box of a paper machine capable of producing highly homogenized paper in a wide range of production conditions by introducing a shear-force reducing fluid into the interface between a raw material feed duct wall and a slurry of fiber raw material, thereby enabling the control of an orientation of fiber.
CONSTITUTION: A tube 2 for supplying water or a high polymer soln. is arranged at an upstream of a distributing section 4. The tube 2 is connected with a supply pump 15 via a flow meter 17 and a valve 16, and a suction opening of the pump 15 is connected with a storage tank 18. When the supply pump 5 works, the shear-force reducing liquid is supplied by the pump 15 from the tube 2 to a neighborhood of the duct wall 1 in the section 4 and the shear-force at the surface of the wall 1 is reduced. Dispersibility of fiber is enhanced by this head box and paper of high homogeneity can be produced.
YAMADA KENJI
EGUCHI AKIRA
KARAKAWA YUJI