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 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
- 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) |
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) |