Fiber processing device, fibrous feedstock recycling device, and control method of a fiber processing device

Abstract

Variation in the amount of material that is dispersed when material containing fiber is discharged by a sieve is suppressed. A fiber processing device has a drum that screens defibrated material containing fiber, a mesh belt that accumulates first screened material discharged from the drum, and a processor that processes the first screened material accumulated on the mesh belt. The drum operates at a first speed during processing by the processor; and when the drum starts from a stationary stop, a startup operation including a state in which the drum operates at a slower speed than the first speed executes for a specific time.

What is claimed is: 
     
         1 . A fiber processing device comprising:
 a sieve configured to screen material containing fiber;   an accumulator configured to accumulate the material discharged from the sieve; and   a processor configured to process the material accumulated on the accumulator;   a controller configured to:
 control the fiber processing device to operate the sieve at a first speed during processing of the accumulated refined material by the processor; and 
 when the sieve starts from a stopped state, execute a startup operation in which the sieve operates at a lower speed than the first speed for a specific time after the sieve starts operating. 
   
     
     
         2 . The fiber processing device described in  claim 1 , wherein:
 in the startup operation, the sieve operates to maintain the operating speed of the sieve at a second speed lower than the first speed for a specific time.   
     
     
         3 . The fiber processing device described in  claim 1 , wherein:
 the startup operation includes a first operation of increasing the speed per unit time of the sieve for a period of time, and a second operation in which increase in the speed per unit time is less than in the first operation after the period of time.   
     
     
         4 . The fiber processing device described in  claim 1 , wherein:
 the sieve starts from a stop with the material inside the sieve.   
     
     
         5 . The fiber processing device described in  claim 1 , wherein
 the controller is configured to control operation of the sieve,   the controller operates the sieve based on a first speed during processing by the processor, and   after the sieve starts, the controller operates the sieve for a specific time based on a set speed, which is lower than the first speed.   
     
     
         6 . The fiber processing device described in  claim 5 , further comprising:
 a humidity detector; wherein   the controller controls the set speed according to information of the humidity detected by the humidity detector.   
     
     
         7 . The fiber processing device described in  claim 1 , wherein:
 the sieve is cylindrical, openings are disposed in the outside surface of the sieve, and the sieve rotates on an axis of the cylinder.   
     
     
         8 . A fibrous feedstock recycling device comprising:
 a refiner configured to refine material containing fiber;   a sieve configured to screen refined material refined by the refiner;   an accumulator configured to accumulate the refined material discharged from the sieve; and   a processor configured to process the refined material accumulated on the accumulator;   a controller configured to:
 control the sieve to operate at a first speed during processing of the accumulated refined material by the processor, and 
 when the sieve starts operating from a stop with the refined material inside the sieve, execute a startup operation in which the sieve operates at a lower speed than the first speed for a specific time after the sieve starts. 
   
     
     
         9 . A control method for a fiber processing device including a sieve configured to screen material containing fiber, an accumulator configured to accumulate the material discharged from the sieve, a processor configured to process the material accumulated on the accumulator, and a driver configured to operate the sieve and cause the material to discharge from the sieve, the control method comprising:
 controlling the driver to operate the sieve at a first speed during processing of the accumulated refined material by the processor; and   when the sieve starts operation from a stopped state, execute a startup operation for a predetermined period of time after the sieve starts, the startup operation including a state in which the sieve operates at a lower speed than the first speed.   
     
     
         10 . A fiber processing device comprising:
 a sieve configured to screen material containing fiber;   an accumulator configured to accumulate the material discharged from the sieve; and   a processor configured to process the material accumulated on the accumulator;   a central processing unit or integrated circuit programmed to:
 control the sieve to operate at a first speed during processing of the accumulated refined material by the processor; and 
 in response to the sieve starting from a stopped state, control the sieve to operate at a second speed that is less than the first speed for a first predetermined period of time. 
   
     
     
         11 . The fiber processing device described in  claim 10 , wherein the central processing unit or the integrated circuit controls the sieve to maintain a steady-state operating speed of the sieve at the second speed for the first predetermined period of time. 
     
     
         12 . The fiber processing device described in  claim 10 , wherein
 the central processing unit or the integrated circuit is further programmed to:
 operate the sieve at a first speed per unit time for a period of time, and 
 operate the sieve at a second speed per unit time that is less than the first speed per unit time after the period of time has elapsed. 
   
     
     
         13 . The fiber processing device described in  claim 10 , wherein the sieve starts from a stop with the material inside the sieve. 
     
     
         14 . The fiber processing device described in  claim 10 , wherein
 the central processing unit or the integrated circuit is further programmed to:
 operate the sieve at the first speed during processing by the processor, and 
 after the sieve starts, operate the sieve for a second predetermined period of time based on a predetermined set speed that is less than the first speed. 
   
     
     
         15 . The fiber processing device described in  claim 14 , further comprising:
 a humidity detector configured to detect a humidity; wherein   the central processing unit or the integrated circuit is further programmed to:
 control the predetermined set speed based on the humidity detected by the humidity detector. 
   
     
     
         16 . The fiber processing device described in  claim 10 , wherein:
 the sieve is cylindrical, openings are disposed in the outside surface of the sieve, and the sieve rotates on an axis of the cylinder.   
     
     
         17 . A fibrous feedstock recycling device comprising the fiber processing device according to  claim 10 .