FBA Completes Research Of Score Profiles On Box Compression Testing BY MARY DRAIN New research has been completed by the Fibre Box As- sociation (FBA) Technical Committee. It was a scoping
vided by Pratt Industries Wapakoneta Corrugated Division. Results from this study showed that scoring profiles can potentially impact BCT by greater than 10 percent. • Score cracking reduces the compression strength by 10+ percent. • Scoring parameters (geometry, depth, etc.) and slotting depth both affect BCT. While the data shows that scoring profile can impact BCT, since the scoring profiles didn’t produce a similar hierarchy of increasing/decreasing BCT between the two board grades using a given score profile, the data in this study didn’t pinpoint what is driving those differences. So further study is needed. FBA held a free webinar November 16 for members, illustrating the new research. John M. Considine, Materials Research Engineer at USDA Forest Service, Forest Prod- ucts Laboratory (FPL) and the project’s principal investiga- tor, provided an overview of the technical research project and shared the findings. Charts were shown and John explained FPL’s analysis of the variance in data sets — within 95 percent confi- dence interval (95 percent CI), so that statistically similar (and dis-similar) groups are easier to recognize. This can help to explain how information from eventual findings can be used to optimize box design for box plants and today’s sustainability strategies. Mary Drain is the Director of Technical Services at FBA. Reach her at mdrain@fibrebox.org.
project that examined the impact of score profile on box compres- sion testing (BCT). This is the third research project completed by the committee since 2017. To the com- mittee and researcher’s knowledge, only one article has been published examining the effect of scoring on
Mary Drain
BCT. And that was approximately 60 years ago. The objective of the study was to determine if different commonly used score profiles have statistically significant effects on BCT, i.e., a more than 10 percent difference. The optimal result is to correspondingly improve BCT by strate- gically applying this information. The study was performed at Forest Products Laboratory (FPL), part of the U.S. For- est Service of USDA. The study used 21-inch by 15-inch by 16-inch single wall RSC samples with two different board grades (32 ECT and 44 ECT). All flaps were taped, 10 replications were done per pa- rameter. And all material testing was performed according to TAPPI. The sample material with score gaps was pro-
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