10/08/2026
Spot the folding issue before it becomes a packaging defect - Why Duplex Board Cracks While Folding (and How to Prevent It)
Cracking happens when the coated surface can’t stretch: the common causes are folding across the grain, incorrect creasing, low humidity, heavy coatings/varnishes and higher GSM. Practical fixes you can apply on the shop floor: align folds with the grain, use the right creasing channel for your GSM, maintain stable humidity (45-55% RH), pre‑crease before folding, avoid varnish on fold lines and choose fold‑friendly duplex grades. ✅📦🛠️
Otley Traders can help specify the right board, tooling and humidity controls. We stock Metsa, IPSUN and Monadnock Mills, offer fast lead times, vendor inventory management and responsive after‑sales support as an FSC‑certified distributor.
Read the full guide on our blog to see detailed causes and step‑by‑step fixes - then tell us about your folding challenge below and we’ll recommend a solution.