The work aims to improve the packaging protection of coke certified reference materials for thermal properties, including coke reactivity index (CRI) and coke strength after reaction (CSR), because these samples are prone to powder formation and edge breakage during storage and transportation, so as to reduce the impact of sample shape changes on the stability of the measured values. According to the lump-like, porous and brittle characteristics of coke, three packaging schemes were compared: loose packing in plastic bottles, vacuum sealing in triple-layer aluminum foil bags, and quadruple-layer nylon-aluminum foil bags combined with expanded polyethylene (EPE) pearl cotton cushioning. Drop tests from 2.0 m at ten specified impact positions and five-layer stacking tests for 24 h were carried out with reference to transport packaging test standards. The mass-loss data were analyzed using one-way ANOVA followed by Welch pairwise t-tests. Scheme A showed an average mass loss of 1.63 g after dropping, and all outer packages were slightly deformed; nevertheless, the coke balls and sealing state remained intact after stacking. Scheme B reduced the average mass loss to 0.36 g, but 90% of the inner bags lost vacuum integrity after dropping. Scheme C gave the lowest average mass loss of 0.22 g, corresponding to 0.052%, and the average outer-package deformation after stacking was 0.03 mm, with no vacuum leakage observed. The mass loss differences among the three schemes were significant (P<0.001), and the difference between schemes B and C was also significant (P=0.016). The composite packaging of quadruple-layer nylon-aluminum foil bags and EPE pearl cotton can improve both puncture resistance and cushioning performance. Scheme A is acceptable for short-term static storage but not for long-distance transportation, whereas scheme C is more suitable for coke and similar fragile lump-form reference materials.
Key words
coke /
standard sample /
packaging design /
protective performance /
drop test /
stacking test
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