Patent ID: 6017421
Filing Date: 2000-01-25
Classification: D21F

Abstract:
A headbox for distributing a stock suspension over the machine width of a paper machine or the like, the headbox comprising:a distributor for supplying stock suspension to the headbox;a headbox nozzle communicating with the distributor, the nozzle having an upstream end for receiving the stock suspension and an outlet for dispensing the stock suspension therethrough over the machine width of the headbox,the nozzle having a top lip and a bottom lip which are spaced apart and include a position of maximum spacing between the top and bottom lips along a flow direction of the suspension through the nozzle, the lips converging toward each other in the flow direction of the stock suspension away from the position of maximum spacing through the nozzle toward the nozzle outlet, and the lips extending over the machine width of the headbox; andat least one baffle being fastened at the upstream end of the headbox in a stationary and flexurally rigid manner and extending in the flow direction from the position of maximum spacing of the lips toward the outlet without extending beyond the headbox outlet, the baffle also extending through the headbox nozzle and over the machine width, the baffle being shorter in height than the spacing distance between the top and bottom lips at the headbox outlet and the baffle having a length in the flow direction of the suspension through the nozzle which is less than twice the maximum spacing between the top and bottom lips of the headbox nozzle.