Sample approval looks perfect, but mass production often brings unexpected defects: warped paper boxes, uneven colour on paper bags, handle detachment, bad folding and compliance non-conformity. Stable quality relies on standardized checkpoints rather than random final inspection.
Incoming Material Inspection
· Paper: Check grammage, thickness, colour shade, surface absorbency and certificate. Reject paper batches with big shade difference or unstable tensile strength.
· Auxiliary materials: Glue, film, ink, rope handles must match EU chemical requirements. Confirm PFAS-free and restricted substance reports before use.
Mid-production Checkpoints for Rigid Boxes
1. Greyboard cutting: Consistent thickness, no burrs.
2. Wrapping process: No bubble, no corner split, neat folding.
3. Finishing check: Hot stamping adhesion, emboss clarity, lamination smoothness.
4. Box shape: No warping, consistent lid gap for magnetic boxes.
Mid-production Checkpoints for Paper Bags
1. Printing colour consistency across the run.
2. Bottom folding & glue sealing test for load bearing.
3. Handle pulling test: Pull force standard to avoid detachment.
4. Crease test: Fold repeatedly to check cracking and ink peeling.
Final Random Inspection before Shipment Randomly pick finished goods following AQL standard. Check appearance, dimension, finishing, load performance and marking. Keep inspection records and retained samples.
Our Quality Promise We run separate QC flows for paper boxes and paper bags, since their failure modes are different. We share inspection reports and photos before shipment for EU customers. Stable quality helps you avoid customer complaints and return costs. Send us your quality standards, we will build a customized QC checklist for your packaging order.