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Weaving Calculations · Lecture 09
Cone Size
Matching cone weight to creel capacity: how many bags of yarn one creel can use, and how small a cone a short sample warp needs.
CreelsCones per bagSample warp
How many bags can the creel take?
Yarn arrives in 100 lb bags. A full creel is one set of cones; the number of complete creels you can fill decides how much of the available yarn can be used at once.
| A | B | |
|---|---|---|
| 1 | Warp count Ne | |
| 2 | Ends per inch | |
| 3 | Width (in) | |
| 4 | Selvedge ends | |
| 5 | Creel capacity | |
| 6 | Cone size (lb) | |
| 7 | Bags available (100 lb each) | |
| 8 | Total ends | 3,840 |
| 9 | Beams (round up to even) | 6 |
| 10 | Cones per creel (ends per beam) | 640.0 |
| 11 | Cones available | 2,398 |
| 12 | Complete creels possible | 3 |
| 13 | Bags actually used | 80.1 |
blue = input (edit me)grey = formula (click to see it)
100 bags give 2,398 cones, enough for only 3 full creels of 640 — so 80 bags are used and 20 bags wait for the next lot. Ordering yarn in multiples of the creel requirement avoids these left-overs.
Cone size for a sample warp
For a short sample the problem is reversed: the cone must carry just enough yarn for the sample length, otherwise most of the cone is wasted.
| A | B | |
|---|---|---|
| 1 | Sample length required (m) | |
| 2 | Wastage | |
| 3 | Warp contraction | |
| 4 | Beams (creels) to be run | |
| 5 | Warp count Ne | |
| 6 | Warp length to be warped (m) | 396 |
| 7 | Metres of yarn per lb at this count | 15,362 |
| 8 | Cone size needed (lb) | 0.155 |
blue = input (edit me)grey = formula (click to see it)
Each cone must feed one end on every one of the 6 beams, hence the multiplication by the number of beams. The answer (0.15 lb ≈ 70 g) is a tiny cone — sample warps are usually made on a sectional or sample warper for exactly this reason.