The physics of on-product design
Why some prints on Italy-shipped merch survive 200 washes and others crack on the first run.
On-product design is constrained by physics first, aesthetics second. A T-shirt print stretches with the cotton; a bottle wrap-print expands and contracts with temperature; a hard-good engraved logo sits a fixed depth into the substrate. Ignore these and you ship beautiful artwork that fails in week three. The team designing for our Italy customers reviews artwork against five physics constraints before approval.
Constraint one is stretch tolerance. DTG and screen prints on cotton withstand 8-12% stretch; embroidery handles much less. Constraint two is heat: dishwashers hit 70°C and most pad-prints on bottles peel above 60°C unless properly cured. Constraint three is UV: outdoor logos fade 3-5% per year in Milano sun; pigments matter. Constraint four is abrasion: bag straps experience millions of friction cycles. Constraint five is chemistry: detergents and skin oils attack inks differently.
Designers who internalise these rules ship better-looking merch because they pick techniques that match the artwork. Embossing for slow, premium effects; sublimation for full-bleed polyester; screen for solid simple shapes; DTG for photographic detail in low runs. Get the technique right and the design lives for years. We share a one-page technique-vs-substrate decision matrix with all Italy customers in the print pages.
FAQ
Best technique for a logo on a T-shirt?
Screen print for two-colour solid logos in 100+ runs; DTG for photographic or low runs; embroidery for premium feel. In Italy 80% of T-shirt orders use screen.
Why does my bottle print peel?
Likely uncured or wrong-substrate ink. Use pad-print with proper UV-cure or, better, factory in-mould labelling for high volumes.
How long should engraving last?
Indefinitely. Stainless steel and anodised aluminium engravings survive 10+ years of normal use. Plastic engravings are shorter-lived.
How do we test before bulk?
Order one pre-production sample and subject it to 20 hand-wash cycles or your harshest expected use. We do this for free in Italy on orders above 200 units.
Sustainability impact of techniques?
Screen and DTG use water and chemicals; embroidery uses thread. Choose certified water-based inks and OEKO-TEX 100 threads — see sustainability.