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 PE Films Weights and Measures
Yield Auditor - Metric Units

Single Roll Cutoff with Wand
and
Heat Seal Pass Through: Roll on Top / Roll on Bottom


Complimentary Slide Rule Complimentary Slide Rule
Complimentary Slide Rule ca. 1976


Check Out the Yield Auditor for Heat Seal Pass Through: Roll on Top / Roll on Bottom


Single Roll Cutoff with Wand

If you are shrink wrapping cases, you are a converter. You buy film by the kilogram and cut it off into sleeves before it goes into the shrink tunnel.

If you buy 55.88 cm X 50.8 μm sheeting and have one ply on top & bottom, for practical purposes, you are making a bag. Multiply the weight per 1,000 packages by the price per kilogram to derive the cost per 1,000 cases.

If you cutoff one sheet at a time - simple. Just imagine a bag by folding either the width or length of the cutoff so there are two plys.

Example:

  • 55.88 cm
  • 50.8 μm (micrometer / micron) (ostensibly)
  • 86.36 cutoff



Half of the web width or ½ of 55.88: 27.94 cm X 86.36 cm X 50.8 μm÷.0001849 = 22.66 kg / 1,000 packages

Half of the web cutoff or ½ of 86.36: 43.18 cm X 55.88 cm X 50.8 μm ÷.0001849 = 22.66 kg / 1,000 packages


Example: Here is an example of film which is 7% "heavy" and well within the ± 10% industry tolerances. However, the film is produced "heavy" adding cost to the packages without the customer realizing the additional cost:

  • 55.88 cm
  • 50.8 μm (micrometer / micron) (ostensibly)
  • 40.64 cm od rolls
  • 34.93 kg per roll
  • No footage marked on roll tags
  • one roll cutoff style
  • 86.36 cutoff
  • 1,443 packages from 1 roll of film @ 34.93 kg per roll
Step 1 measured cutoff = 55.88 cm
Step 2 1,443 packages from 1 roll of film
Step 3 weight per 1,000 packages = 22.66 kg / 1,000
Step 4 34.93 kg ÷ 22.66 kg /1,000 = 1541 "theoretical yield" from 34.93 kg film
Step 5 compare actual (1,443) to theoretical (1,541)

In this example, the real cost per 1,000,000 cases assuming a price of $1 per pound is $53,350 not $49,860.

 

 
          Width (cm.) :                        
         
          Cutoff (cm.) :                       
         
          Gauge(μm) :                     
         
                   
         
                      
         
                 
         
         
       
 

  

                                     
         
  Number of kilograms per Roll (kg):

                                     
         
          Number of Rolls:           
         
                   
 

                               
         
                                   
         
       

Heat Seal Pass Through: Roll on Top / Roll on Bottom

Example:

Here is a nearly perfect scenario:

  • 55.88 cm
  • 50.8 μm (micrometer / micron) (ostensibly)
  • 40.64 cm od rolls
  • 31.75 kg per roll
  • No footage marked on roll tags
  • 2 rolls of film in a heat-sealed pass through fashion
  • 73.66 cutoff
  • 3,309 packages from 2 rolls of film @ 31.75 kg per roll
Step 1 measured cutoff = 73.66 cm
Step 2 3,309 packages from 63.5 kg of film (2 rolls x 31.75 kg / roll)
Step 3 weight per 1,000 packages = 19.331 kg / 1,000
Step 4 63.5 kg ÷ 19.331 kg /1,000 = 3284 "theoretical yield" from 63.5 kg film
Step 5 compare actual (3,309) to theoretical (3,285)

 

 

          Width (cm) :            
         
          Cutoff (cm) :            
         
          Gauge(μm) :           
         
                   
         
 

                                    
         
                                       
         
         
       

 

                 

                                  
         
          Number of Kilograms per Roll (kg):

                                         
         
          Number of Rolls: