Laying a Marker on a Directional Stripe With One Off-Shade Roll
A Ludhiana unit has won an order for 300 school shirts in a 90 cm wide yarn-dyed striped poplin. Stripes are 4 mm wide and must run vertically; the buyer's tech pack requires stripe matching at the placket, pocket and side seams. The fabric store holds 450 m in three rolls of 200 m, 150 m and 100 m. The third roll is visibly darker in daylight than the other two, although all three roll tickets carry the same shade number. The approved marker is 8.40 m long and carries one set of six shirt panels at a marker efficiency of 79%; fabric consumption works out to 1.40 m per shirt. The unit's standard allowance is 2% for shrinkage and 3% for end loss and cutting damage. The cutting master proposes spreading all three rolls in one 12-ply lay to save time, and tilting the front pattern pieces by 5° to squeeze in two extra panels. Delivery is in 18 days and the buyer's inspection is on the day of dispatch.
1. Calculate the fabric required for 300 shirts and state whether the order can be completed from the 450 m in stock. Show every step.
Read the worked answer
Step 1 - Base consumption. 300 shirts × 1.40 m = 420 m.
Step 2 - Add cutting allowances. These stack on the base, not on each other:
- shrinkage 2% → 420 × 1.02 = 428.4 m
- end loss and damage 3% → 428.4 × 1.03 = 441.25 m (or the equivalent single step: 420 × 1.05 = 441 m)
Step 3 - Compare with stock. 441 m needed against 450 m available = 9 m headroom, about 2%.
Interpretation. On paper the order fits, but the margin is not real. Nine metres is roughly one marker length plus a bit; any re-cut of a damaged panel, any splice, any size rebalancing in the last lay, or any decision to cut the dark roll separately will wipe it out. So the answer is conditionally yes: feasible only if the lay plan uses exactly the assumed number of lays and no panel is re-cut. The professional response is to state this in writing to the production manager before cutting starts and to ask the fabric supplier to hold 40–50 m of the same lot as backup.
2. How should the three rolls be laid? Justify your lay plan and say what it costs you in fabric.
Read the worked answer
Do not spread all three rolls in one lay. Yarn-dyed stripes from different dye lots, even with identical shade tickets, almost never match under buyer inspection lighting. If the darker roll ends up in one panel of a shirt and the lighter rolls in another, the garment shows a two-tone effect at the side seam - a defect, not a shade variation.
Lay plan:
- Treat rolls 1 and 2 (200 m + 150 m = 350 m) as one shade lot. With a 12-ply lay of the 8.40 m marker, one lay yields 6 × 12 = 72 shirts and consumes 12 × 8.40 = 100.8 m. Do 4 lays = 288 shirts, using 403 m - but that is more than 350 m, so trim to 3 full lays (216 shirts, 302.4 m) plus a part lay from the balance.
- Cut the 100 m dark roll as a separate lay: about 100 ÷ 1.40 ≈ 71 shirts (say 60–66 after allowances). These shirts must be kept as a separate shade band, packed in marked cartons, and ideally placed in a single size so that no customer opens a carton with two shades.
The cost of good practice: each separate lay adds one marker length of end loss, roughly 8.4 m. Two extra lays ≈ 17 m - more than the 9 m headroom, which is exactly why the supplier must be asked for extra fabric or the buyer asked to approve the dark roll as a declared shade band.
What not to do: stitching the dark roll into the main lot and hoping. Shade rejection at final inspection costs far more than 20 m of poplin.
3. Evaluate the cutting master's 5° tilt of the front pattern pieces. What is the real cause of the 79% marker efficiency and what would you do instead?
Read the worked answer
The tilt is unacceptable. Tilting a pattern piece off the lengthwise grain means:
- the stripes no longer run parallel to the grain line, so they will not align at the side seam after the panel is sewn;
- the garment will twist and hang unevenly after washing, because warp yarns are now at an angle to the body;
- the buyer's tech pack specifies vertical stripes and stripe matching at placket, pocket and seam - a tilted panel fails the inspection on the first garment measured.
The two extra panels gained are worth perhaps ₹400 of fabric; the rejected shipment is worth the whole order. This is a false economy.
Real cause of low efficiency (79%). On a 90 cm width with a directional stripe, pieces cannot be reversed or nested, so there is unavoidable loss at the selvedge and around curved armholes. 79% is low but not shocking for a directional stripe on narrow width - however it can usually be pushed to 83–86% by:
- re-grading the marker for 2–3 size combinations instead of a single size set;
- placing the smallest pieces (collars, cuffs, yokes) in the selvedge gaps;
- checking whether the fabric can be ordered in 110 cm width, which cuts selvedge waste sharply;
- using a CAD marker rather than a hand-shuffled one, and recording the best of several trials.
Rule to give the cutting master: efficiency is improved by better arrangement, never by changing grain.