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Weaving Calculations · Lecture 08
Breakages and Sized Count
Expressing warp breaks per unit length so mills can be compared, and finding the count of yarn after sizing.
Breaks per 10⁶ mSized countSize add-on
Breaks per million metres
A warper or sizer reports “one break every 51 lb” — but 51 lb of Ne 21 is a very different length from 51 lb of Ne 10. Convert poundage to yardage with the count and the comparison becomes fair:
yards per break = Ne × lb per break × 840 · metres = yards ÷ 1.0936 · breaks per 10 million m = 10⁷ ÷ metres per break
| A | B | C | D | E | |
|---|---|---|---|---|---|
| 1 | Count Ne | lb per break | yd per break | m per break | Breaks / 10 million m |
| 2 | 902,110 | 824,899 | 12.12 | ||
| 3 | 1,201,200 | 1,098,391 | 9.10 | ||
| 4 | 1,108,800 | 1,013,899 | 9.86 | ||
| 5 | 1,411,200 | 1,290,417 | 7.75 | ||
| 6 | 1,360,800 | 1,244,331 | 8.04 |
blue = input (edit me)grey = formula (click to see it)
The Ne 60 warp breaking every 27 lb (8 breaks per 10 million m) is actually performing better than the Ne 21 warp breaking every 51 lb (12 breaks). Poundage flatters coarse yarns.
Count of sized yarn
Size adds weight but no length, so the yarn becomes “coarser”. The sized count is needed for loom-side yarn stock calculations and for weight-based selling of fabric.
| A | B | |
|---|---|---|
| 1 | Warp count Ne (unsized) | |
| 2 | Ends on beam | |
| 3 | Length on beam (yd) | |
| 4 | Size add-on | |
| 5 | Unsized warp weight (lb) | 1,446.4 |
| 6 | Sized warp weight (lb) | 1,627.2 |
| 7 | Count of sized warp Ne | 17.78 |
blue = input (edit me)grey = formula (click to see it)
Sized count = Ne ÷ (1 + size add-on) → 20 ÷ 1.125 = 17.8
Original lecture material
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