Industry News
Zhejiang Grey Board Mills Hold Caliper Tighter as Rigid Box Plants Reject Drift
Grey board suppliers in Zhejiang are advertising tighter caliper tolerance after rigid box plants rejected spot lots that forced die remakes.
Grey board mills around Jiaxing and Pinghu say rigid-box converters are rejecting more spot lots where caliper drifts outside the die’s design window, especially on 1.5–2.5 mm turning grades.
Mills that publish lot-level caliper and moisture data are winning repeat POs even when not the lowest bid. Unlabeled “equivalent thickness” swaps remain a flashpoint for lid fit and magnet alignment.
Why buyers care: a 0.1–0.2 mm drift can scrap wrap paper and hard-tooling time on premium gift programs.
Buyer takeaways
Put caliper tolerance and moisture range on the PO.
Require lot tickets before die-cut of wrapped components.
Avoid mixing mills inside one lid/base set without a fit check.