PATCH MAKING
A patch that curls after one wash usually failed before the first stitch: the border was too narrow, the backing was wrong, or the fill was too dense for the fabric. Here is a production-minded sequence that holds up.
Start with the edge, not the artwork
The outer edge is what people touch, fold and wash. Decide the patch shape first, then choose a border that can wrap that shape without crowding the artwork. A 2–3 mm satin border is a good default for a 70–100 mm patch. A merrow edge can look more traditional, but it needs a clean contour and enough space for the overlock to sit outside the fill.
Keep at least 3 mm between the artwork and the inner edge of the border. If a letter or a leaf touches the border, the satin and the fill fight for the same pixels; the result is a lumpy edge, not a crisp one.
Choose the backing for the end use
- Sew-on: the most durable and the easiest to wash. Use a woven or non-woven backing that does not fray.
- Iron-on: convenient, but heat and repeated washing can lift the adhesive. Use a quality adhesive film and test it on the target fabric.
- Hook-and-loop: good for removable patches. Keep the loop side on the garment and the hook side on the patch, or the reverse, depending on how the customer will use it.
For a patch that will be washed often, a sewn edge plus a sew-on backing is still the most reliable combination.
Build the fill in the right order
Use an underlay that runs across the final fill direction. On a 100 mm patch, a 0.35–0.45 mm row spacing is a practical starting point for a solid tatami fill; dense enough to cover, open enough not to create a stiff board. If the design has large flat areas, keep the fill angle consistent across the shape rather than changing it at every small contour.
Add a pull compensation of about 0.15–0.25 mm for a woven fabric. Too little leaves a white halo between colours; too much makes small details close up. Check the actual preview at full size, not a thumbnail.
The border is a structural element
A satin border should overlap the fill slightly and sit on the true outer contour. The inner rail should be clean and continuous. If the border is built from a single offset ring, it will scallop on curves. A two-rail satin with a consistent normal is much more reliable.
For a merrow finish, the overlock needs a stable edge and a contour that does not have deep inside corners. A deep notch is where the overlock skips or bunches.
Test the wash before you sell
Sew a sample, wash it inside a pillowcase on a normal cycle, and dry it the way the customer will. Check for curling, edge fray, colour bleed and adhesive lift. A patch that survives a warm wash and a tumble dry is a product; one that only survives a hand wash is a prototype.
File checklist
- One colour change per thread, in a sensible order.
- No tiny trims inside the fill.
- Border width and fill overlap checked at 100% zoom.
- DST plus a colour chart; the machine does not read colour from DST.
- A sew-out on the actual fabric and backing.
If the artwork has 2–3 mm text that must stay sharp, stop trying to force it through a needle. Use a hybrid print centre with an embroidered border or simplify the lettering.