Patent ID: 11927504
Assignee: ZHENGZHOU TOBACCO RESEARCH INSTITUTE OF CNTC
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. The non-destructive determination method of a cigarette packet's seal according to claim 3, wherein:
in step (6, the above is based on Fick's law of diffusion:, p
   t
  
  =
  
   
    p
    e
   
   +
   
    
     (
     
      
       p
       
        t
        ⁢
        0
       
      
      -
      
       p
       e
      
     
     )
    
    ·
    
     exp
     [
     
      
       -
       
        
         p
         
          t
          ⁢
          0
         
        
        
         
          (
          
           
            p
            
             t
             ⁢
             0
            
           
           -
           
            p
            e
           
          
          )
         
         ·
         
          V
          1
         
        
       
      
      ·
      L
      ·
      k
      ·
      t
     
     ]
    
   
  
 

k: effective diffusion coefficient of cigarette packet (m2/s); L: effective distance (m); V1: external volume of cigarette packet (m3); Pe: final pressure of airtight chamber (Pa); Pt: measured pressure of airtight chamber (Pa); Pt0: initial pressure of the airtight chamber (Pa).