PE Films Weights and Measures
Yield Auditor - English Units
Single Roll Cutoff with Wand and Heat Seal Pass Through: Roll on Top / Roll on Bottom

Complimentary Slide Rule Complimentary Slide Rule

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.

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 1measured cutoff = 29″
Step 23,309 packages from 140 pounds of film (2 rolls x 70 # / roll)
Step 3weight per 1,000 packages = 42.53 # / 1,000
Step 4140 # ÷ 42.53 # /1,000 = 3284 “theoretical yield” from 140 # film
Step 5compare actual (3,309) to theoretical (3,292)

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

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