Abstract: The invention relates to a method and apparatus for continuous manufacture of surface sizing starch, wet-end starch or binder starch in paper, cardboard and chemical pulp industry. The starch slurry is modified as a starch size suitable for the application (6) by exposing the starch slurry to ultra sound in the ultrasonic unit (4, 4a, 4b).

Abstract: The invention relates to a method and apparatus for continuous manufacture of surface sizing starch, wet-end starch or binder starch in paper, cardboard and chemical pulp industry. The starch slurry is modified as a starch size suitable for the application (6) by exposing the starch slurry to ultra sound in the ultrasonic unit (4, 4a, 4b).

Abstract: A chemical or chemical compound (L) is supplied via at least two displacement pumps (1, 4) to a common supply line (11), through which the chemical or chemical compound (L) is supplied to the operating device (12) of a fibrous web machine. Each pump (1, 4) has a corresponding electric actuator (2, 5) which is equipped with a corresponding control drive (3, 6). The fibrous web machine has a measuring device (8; 8a, 8b) for determining the phase angles of at least the first and second actuators (2,5). A control signal based on the determined phase angle information is formed and transmitted to the first control drive (3), based on the control signal, the difference between the first and second electric actuators (2, 5) is adjusted. An electric synchronization signal between the control drives (3, 6) maintains the difference between the phase angles electric actuators (2, 5).

Abstract: A chemical or chemical compound (L) is supplied via at least two displacement pumps (1, 4) to a common supply line (11), through which the chemical or chemical compound (L) is supplied to the operating device (12) of a fibrous web machine. Each pump (1, 4) has a corresponding electric actuator (2, 5) which is equipped with a corresponding control drive (3, 6). The fibrous web machine has a measuring device (8; 8a, 8b) for determining the phase angles of at least the first and second actuators (2,5). A control signal based on the determined phase angle information is formed and transmitted to the first control drive (3), based on the control signal, the difference between the first and second electric actuators (2, 5) is adjusted. An electric synchronization signal between the control drives (3, 6) maintains the difference between the phase angles electric actuators (2, 5).