Possible causes include incompatible foil or surface, insufficient or uneven heat, pressure or dwell, poor makeready, contamination, roughness, coating cure and excessive speed. Diagnose with the exact material stack.

Excessive transfer around the image, unsuitable die geometry, too much heat or pressure, soft backing, adhesive spread or artwork that is too dense for the route can reduce edge definition.

Fine elements need compatible artwork, die, foil release, surface smoothness and stable settings. Do not apply a universal minimum size; test positive and reversed detail separately.

Large solids magnify surface roughness, board variation, pressure distribution and trapped contamination. They may need different foil, die, makeready or artwork segmentation from fine detail.

Sheet movement, gripper references, paper dimensional change, prior-process variation, die positioning and register-system setup all matter. Define the registration reference and inspect the combined result.

Yes. Film chemistry, texture, slip additives, surface treatment and lamination cure affect transfer and adhesion. Confirm a foil grade intended for the exact finished surface.

Foil and surface layers may be strained when the substrate bends. Position, grain, score geometry, board, laminate and folding sequence should be tested on the final carton.

Not always. The two areas can need conflicting transfer conditions. Separate dies, zones, artwork changes or production passes may be considered after trials.

Provide 1:1 vector artwork with foil separated as a named spot layer, clear knockout and trapping intent, dieline reference and no unintended raster effects. Confirm minimum details with the converter.

Approve the exact foil grade, substrate, print and finish sequence, die artwork, position and a production-representative stamped sample under agreed lighting and defect criteria.