Method and arrangement for ameliorating the dewatering in a thin wire press

A pulp processing apparatus comprising a first endless wire, a second endless wire opposed to said first endless wire, said first and second endless wires being conveyed in the same conveying direction to define a web-forming space therebetween for dewatering a web pulp, first and second perforated dewatering tables supporting said first and second endless wires, respectively, for pressing said first and second endless wires towards said web, said first and second perforated dewatering tables including a front end and a back end with respect to said conveying direction of said first and second endless wires, said back end of said first perforated dewatering table being upstream of said back end of said second perforated dewatering table, and a press roll downstream of said back end of said first perforated dewatering table, said press roll being opposed to said back end of said second perforated dewatering table so as to form a nip between said press roll and said back end of said second perforated dewatering table, said back end of said second perforated dewatering table including a profiled surface that interacts with said press roll so as to prolong said nip between said press roll and said back end of said second perforated dewatering table.

A method of processing a fiber web between a space between first and second endless wires including conveying said first and second endless wires in a conveying direction for a predetermined distance, supporting said first and second endless wires by first and second perforated dewatering tables, respectively, pressing said first and second endless wires towards the web therebetween by means of said first and second perforated dewatering tables, each of said first and second perforated dewatering tables including a front end and a back end with respect to said conveying direction of said first and second endless wires, and pressing said first and second endless wires towards each other in a nip formed between a press roll located downstream of the back end of said first perforated dewatering table and the back end of said second perforated dewatering table, the back end of said second perforated dewatering table having a profiled surface at least partially corresponding to the surface of the opposed press roll and interacting with the press roll so as to prolong the nip between said press roll and the back end of said second perforated dewatering table.