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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 pound and cut it off into sleeves before it goes into the shrink tunnel.

If you buy 22 in. X 2 mils 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:
22 in.
2 mils
34 in. cutoff



Half of the web width or ½ of 22": 11" X 34" X 2 mils÷15 = 49.86 # / 1,000 packages

Half of the web cutoff or ½ of 34": 17" X 22 X 2 mils ÷15 = 49.86 # / 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:

  • 22"
  • 2 mils (ostensibly)
  • 16" od rolls
  • 77 pounds per roll
  • No footage marked on roll tags
  • one roll cutoff style
  • 34" cutoff
  • 1,443 packages from 1 roll of film @ 77 pounds per roll
Step 1 measured cutoff = 34"
Step 2 1,443 packages from 1 roll of film
Step 3 weight per 1,000 packages = 49.86 # / 1,000
Step 4 77 # ÷ 42.53 # /1,000 = 1544 "theoretical yield" from 34.93 kg film
Step 5 compare actual (1,443) to theoretical (1,544)

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 (in.) :                    
         
          Cutoff (in.) :                   
         
          Gauge(mil) :                   
         
                   
         
  

                                     

         
                                        
         
         
       

 

                                     
 Number of Pounds per Roll (lb):     

                            

        
 Number of Rolls:           
         
                   
         
 

                               
         
                                   
         
       

 

 

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

Example:

Here is a nearly perfect scenario:

  • 22″
  • 2 mils 16″ od rolls
  • 70 pounds per roll
  • No footage marked on roll tags
  • one roll on top one roll on bottom
  • 2 rolls of shrink film in a heat-sealed pass through fashion
  • 29″ cutoff
  • 3,309 packages from 2 rolls of film @ 70 pounds per roll
Step 1 measured cutoff = 29"
Step 2 3,309 packages from 140 pounds of film (2 rolls x 70 # / roll)
Step 3 weight per 1,000 packages = 42.53 # / 1,000
Step 4 140 # ÷ 42.53 # /1,000 = 3284 "theoretical yield" from 140 # film
Step 5 compare actual (3,309) to theoretical (3,292)

In this example, the yield is practically perfect and there were 17 "free" packages from "light film".

          Width (in.) :                
          Cutoff (in.) :                 
         
          Gauge (mil) :                
         
                   
         
                                
         
                   
         
       
 

 

                                    
         
          Number of Pounds per Roll (lb):

                                      
         
          Number of Rolls: