Dynamic Relative Humidity Creep Decay in Corrugated Packaging Substrates
Dynamic relative humidity cycling drives exponential creep decay in corrugated board through mechano-sorptive bond cleavage, requiring dynamic safety factors.
TAPPI T402 Standard
Testing Protocol
Laboratory protocol defines the specific temperature and humidity conditions required for the standardized testing of paper and board products. Tappi t402 standard specifies an environment of twenty-three degrees Celsius and fifty percent relative humidity to ensure that results are comparable across different laboratories. It also dictates the duration for pre-conditioning samples to eliminate the effects of their previous moisture history.
Environment Control
Physical properties of cellulose are highly dependent on the amount of water held within the fibre walls. Tensile strength and stiffness fluctuate as the sheet equilibrates with the surrounding air. By holding the environment constant, the industry can establish a reliable baseline for quality control and material specifications.
Data Baseline
Following this protocol is mandatory for any commercial dispute involving the physical properties of a shipment. If a lab tests a sample at a higher humidity, the resulting strength values will be lower than the true specification. This standard allows global buyers and sellers to agree on the technical performance of a grade without being influenced by local weather conditions.
Consistent conditioning is the foundation of all other physical testing procedures. Most laboratories use specialized climate-controlled rooms with high-precision sensors to maintain these tolerances.