Duan Yuqing, Wang Shumei, Xu Tingting, Bian Huiyang, Dai Hongqi
Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing 210037, China.
Polymers (Basel). 2024 Jul 2;16(13):1892. doi: 10.3390/polym16131892.
The characteristics of fiber morphology and paper structure are critical to the barrier properties of food packaging paper. Herein, this study aimed to use pulp fibrillation, paper semi-dry pressing and carboxymethyl starch (CMS) coating to flatten the fibers, which were formed on the paper surface with good barrier properties due to the tight bond between fibers. The results showed that the permeability of paper was reduced by 87.56%, from 81.44 μm/Pa·s to 10.13 μm/Pa·s after the pulp fibrillation treatment (60 °SR). Moreover, semi-dry pressing treatment contributed to decreasing the water vapor transmission coefficient (WVP) by 50.98% to 2.74 × 10 g/m·s·Pa, and the oxygen permeation coefficient (OP) decreased by 98.04% to 1.93 × 10 cm·cm/cm·s·Pa. After coating the paper surface with titanium dioxide (TiO) and CMS, the WVP of the paper was further reduced to 1.55 × 10 g/m·s·Pa, and OP was reduced to 0.19 × 10 cm·cm/cm·s·Pa. These values were 72.27% and 99.8% lower than those of the original paper, respectively. Therefore, through pulp fibrillation, semi-dry pressing of paper, TiO filling, and surface coating with CMS, there is no need to use synthetic polymer surface film-forming agents to achieve the high barrier properties that are required for low water and oxygen molecules permeation in food packaging paper.
纤维形态和纸张结构的特性对食品包装纸的阻隔性能至关重要。在此，本研究旨在通过纸浆纤维化、纸张半干压和羧甲基淀粉（CMS）涂层来使纤维扁平化，由于纤维之间紧密结合，这些纤维在纸张表面形成了具有良好阻隔性能的结构。结果表明，纸浆纤维化处理（60°SR）后，纸张的渗透率从81.44μm/Pa·s降低到10.13μm/Pa·s，降低了87.56%。此外，半干压处理使水蒸气透过系数（WVP）降低了50.98%，降至2.74×10 g/m·s·Pa，氧气渗透系数（OP）降低了98.04%，降至1.93×10 cm·cm/cm·s·Pa。在用二氧化钛（TiO）和CMS对纸张表面进行涂层后，纸张的WVP进一步降至1.55×10 g/m·s·Pa，OP降至0.19×10 cm·cm/cm·s·Pa。这些值分别比原纸张低72.27%和99.8%。因此，通过纸浆纤维化、纸张半干压、TiO填充和CMS表面涂层，无需使用合成聚合物表面成膜剂即可实现食品包装纸中低水分和氧气分子渗透所需的高阻隔性能。
