公开(公告)号：US3676295A

公开(公告)日：1972-07-11

申请号：US3676295D

申请日：1969-09-12

Applicant: INDUSTRIAL NUCLEONICS CORP

Inventor： RICE JAMES S

IPC: D21F1/06 ,  D21G9/00 ,  D21F5/06

CPC classification number: D21G9/0027 ,  D21F1/06 ,  D21G9/0036 ,  Y10S162/06 ,  Y10S162/11

Abstract: MOISTURE AND FIBER CONTENT OF A FIBROUS SHEET ARE CONTROLLED DURING MANUFACTURE BY MEASURING THE SHEET MOISTURE DIWNSTREAM OF A DRYER IN THE MANFUACTURING MACHINE, AS WELL AS THE SHEET FIBER CONTENT. THE FIBER CONTENT AND MOISTURE MEASUREMENTS ARE COMBINED TO CONTROL THE DRYER DRYING RATE IN SUCH A MANNER THAT CHANGES IN THE RATE AT WHICH FIBER IS FED TO THE MACHINE ARE COMPENSATED FOR BY CHANGES IN THE DRYER DRYING RATE SO THAT CHANGES IN THE MOISTURE CONTENT OF THE SHEET ARE GREATLY MINIMIZED. THE RATE OF FIBER FLOW IS CONTROLLED IN RESPONSE TO AN ERROR

SIGNAL FOR THE SHEET FIBER CONTENT AND THE RATE AT WHICH FIBER IS FED INTO MACHINE.

公开(公告)号：US3703436A

公开(公告)日：1972-11-21

申请号：US3703436D

申请日：1970-02-03

Applicant: INDUSTRIAL NUCLEONICS CORP

Inventor： RICE JAMES S

IPC: D21F1/02 ,  D21F1/06

CPC classification number: D21F1/02 ,  Y10S162/11

Abstract: A HEADBOX OF A MACHINE PRODUCING A FIBROUS SHEET HAS A SLICE OPENING CONTROLLED IN RESPONSE TO SIGNALS INDICATIVE OF TOTAL HEAD OF FLUID IN THE HEADBOX, THE RATE OF FLOW OF A FIBROUS SLURRY INTO THE HEADBOX AND THE SPEED OF A FOURDRINIER WIRE RECEIVING A JET OF SLURRY EMERGING FROM THE HEADBOX SLICE. THE SLICE OPENING IS CONTROLLED TO AFFECT FORMATION OF THE FIBROUS SHEET ON THE WIRE. CONSISTENCY OF THE SLURRY BEING FED INTO THE HEADBOX IS VARIED TO CONTROL THE POSITION OF A DRY LINE ON THE WIRE OF FORMATION OF FIBERS ON THE WIRE. THE LEVEL OF LIQUID IN THE HEADBOX IS MAINTAINED AT A PREDETERMINED LEVEL BY A CONTROLLER. THE SLICE OPENING IS CONTROLLED IN ANTICIPATORY MANNER TO COMPENSATE FOR THE SLOW RESPONSE OF THE TOTAL HEAD IN THE HEADBOX TO CHANGES OCCURING IN RESPONSE TO THE SLURRY MASS FLOW RATE INTO AND OUT OF THE HEADBOX. THE CONTROLLER FOR THE SLICE OPENING IS PROVIDED WITH DEADBAND.