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

Claim 3:
4. The non-destructive determination method of a cigarette packet's seal according to claim 3, wherein:
in step (6, the above is based on Darcy's law:, p
   t
  
  =
  
   
    
     
      -
      
       p
       
        t
        ⁢
        0
       
      
     
     ·
     
      (
      
       
        p
        e
       
       +
       
        P
        0
       
      
      )
     
    
    
     
      -
      
       p
       e
      
     
     -
     
      
       
        p
        e
       
       -
       
        p
        
         t
         ⁢
         0
        
       
      
      
       
        
         -
         
          
           p
           
            t
            ⁢
            0
           
          
          
           P
           0
          
         
        
        ·
        
         exp
         ⁡
         (
         
          
           -
           1.67
          
          ×
          
           
            10
            
             -
             7
            
           
           ·
           α
           ·
           
            
             
              -
              
               p
               
                t
                ⁢
                0
               
              
             
             ·
             
              (
              
               
                p
                e
               
               +
               
                P
                0
               
              
              )
             
            
            
             
              p
              e
             
             -
             
              p
              
               t
               ⁢
               0
              
             
            
           
           ·
           
            A
            
             V
             1
            
           
           ·
           t
          
         
         )
        
       
       -
       1
      
     
    
   
   -
   
    P
    0
   
  
 

α: effective air permeability of cigarette packet (cm/min); As: surface area of cigarette packet (m2); V1: external volume of cigarette packet (m3); P0: initial pressure of cigarette packet (1.01*105 Pa); Pe: final pressure of the airtight chamber (Pa); Pt: measured pressure of the airtight chamber (Pa); Pt0: initial pressure (Pa) of the airtight chamber.