The relationship between board stiffness and crease stiffness, or crease recovery (spring back) as it is also known, is an important factor in the machine performance of cartons.
Board stiffness is determined by bending a 50 mm length test piece through a 15° angle. Crease recovery is determined by holding a formed crease at 90° and measuring the recovery force after 15 seconds. The maximum folding force is also recorded.
This information can be used to evaluate crease performance across different crease settings or compare the performance of different carton board materials.
Standards and accreditation
Crease stiffness testing is performed to British standard BS 6965:1 and board stiffness testing in accordance with BS 3748 and ISO 2493.
Talk to our experts about your carton board material, crease settings or folding performance requirements.
