Patent ID: 6277243
Filing Date: 2001-08-21
Classification: D21F

Abstract:
A method for the mixing and recirculation of stock suspensions, backwater, and return flows in one of a paper or cardboard machine, the machine having at least one head box having a wet section, a backwater tank, a vertical separator stage, a cleaner stage, the method comprising:feeding backwater from the wet section into a backwater tank;feeding the return flow into a mixing tank, the return flow comprising at least one of recirculation of the head box, accepted stock of at least one vertical separator stage, and accepted stock of least one cleaner stage;mixing the return flow in the mixing tank;injecting the return flow from the mixing tank into a lower region of the backwater tank via a pressure increasing device;mixing the return flow with the backwater and added fresh stock; andfeeding the mixture of return flow, backwater and added fresh stock to the head box via a separation device.