Piezoelectric Stress Wave Analysis in Rotary Die Scoring Operations
Piezoelectric stress wave monitoring detects cartonboard score cracking in real time by capturing high-frequency elastic strain transients at rotary die nips.
Iso 12716
Standard Specification
Test methods documented in international standardization frameworks establish standardized procedures for measuring water resistance and liquid absorption in paper, board, and corrugated structures. The ISO 12716 specification governs standardized testing protocols designed to evaluate water absorption characteristics of paperboard subjected to immersion or surface wetting. Packaging converters utilize this standardized method to verify water resistance in corrugated shipping containers destined for cold storage or humid transit environments.
Controlled liquid exposure measures rate of mass increase over specified duration intervals.
Test Protocol
Conditioned test specimens are weighed, exposed to distilled water under defined temperature and hydrostatic pressure, and blotted before final mass determination. Standard procedures specify precise water temperature, immersion duration, and specimen clamping force to ensure repeatable measurements across testing laboratories. The resulting absorption value expressed in grams per square meter dictates whether raw paperboard meets wet strength requirements for produce packaging.
Proper specimen conditioning at standard temperature and relative humidity prevents moisture baseline errors.
Substrate Boundary
Measurement results lose validity when applied to heavily waxed or plastic laminated paperboards where surface barrier layers prevent uniform water contact. Edges of thick corrugated board samples require edge sealing compounds to prevent lateral water wicking into fluting channels during immersion.