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Textile Costing · Lecture 19
Review of Weaving Calculations II
Loom production per day, B-grade adjustment, sizing and packing cost — the variable production cost of one metre of grey fabric.
Loom productionB-gradeSizing costVariable cost per metre
Production of a loom
An air-jet loom at 800 rpm inserting 60 picks per inch at 90% efficiency makes 12 inches a minute: 800 × 0.9 ÷ 60. Per day that is 480 yd; 1% of it is B-grade, so 475 yd of A-grade — 435 m. Sizing is paid per kg of sized warp; packing per metre; B-grade fetches a lower price that comes back as a small credit.
| A | B | C | |||
|---|---|---|---|---|---|
| 1 | RPM | ||||
| 2 | Efficiency | ||||
| 3 | Picks per inch | ||||
| 4 | Production per minute (in) | 12.00 | in | ||
| 5 | Production per day (yd) | 480.0 | yd | ||
| 6 | B-grade | ||||
| 7 | A-grade production per day (yd) | 475.2 | yd | ||
| 8 | A-grade production per day (m) | 434.5 | m | ||
| 9 | Variable production cost per metre | ||||
| 10 | Yarn cost per metre (from Lecture 18) | ||||
| 11 | Warp weight per yard before wastage (lb) | ||||
| 12 | Warp contraction | ||||
| 13 | Sized warp per metre (kg) — all wastage assumed in warping | 0.124 | kg | ||
| 14 | Sizing cost per kg | ||||
| 15 | Sizing cost per metre | 1.24 | |||
| 16 | Packing cost per metre | ||||
| 17 | B-grade price per metre | ||||
| 18 | B-grade proceeds per metre (credit) | (0.21) | |||
| 19 | Total variable production cost per metre | 29.32 | |||
blue = input (edit me)grey = formula (click to see it)