目的 降低白卡纸在压痕折弯过程中的表面裂纹及后续复合铝层、油墨层的折裂风险,在白卡纸光面构建聚乙烯醇（PVA）和生物基聚氨酯（PU）柔性涂层。方法 以白卡纸为基材,通过PVA及PVA/PU溶液对白卡纸进行涂布,制备厚度约为1、5、10 μm的涂布白卡纸,结合压痕折弯试验、偏光显微观察和数字图像相关（DIC）技术,研究折弯角度、循环折弯次数、涂层组成及厚度对折痕区裂纹行为和表面应变分布的影响。结果 未涂布白卡纸在压痕后即出现初始裂纹,且随折弯角度和循环折弯次数增加,裂纹长度、宽度及面积占比持续增大。涂布白卡纸的PVA及PVA/PU涂层均能显著抑制裂纹张开与扩展,其中PVA/PU涂层在循环折弯条件下表现更优。DIC结果表明,在30°~120°时,涂层对应变影响有限,而在120°~150°高角度折弯下,涂层可有效降低最大应变和应变集中。结果表明,柔性聚合物涂层主要通过增强表层连续性、缓解局部应变集中和提高裂纹扩展阻力来抑制折痕区损伤演化。结论 聚乙烯醇/生物基聚氨酯复合涂层能够有效抑制白卡纸压痕折弯过程中的表面裂纹形成与扩展,降低折痕区损伤风险。
Abstract
The work aims to reduce surface cracking of white paperboard during creasing and bending, as well as the subsequent fracture risk of laminated aluminum and ink layers, and construct flexible coatings based on polyvinyl alcohol (PVA) and bio-based polyurethane (PU) on the coated side of paperboard. With white paperboard as the substrate, PVA and PVA/PU coatings with thicknesses of approximately 1, 5, and 10 μm were prepared. The effects of bending angle, cycle number, coating composition, and coating thickness on the crack behavior and surface strain distribution in the crease zone were investigated by combining creasing-bending tests, polarized optical microscopy, and digital image correlation (DIC). The results showed that initial cracks appeared in the uncoated samples immediately after creasing, and the crack length, width, and area fraction continuously increased with increasing bending angle and cycle number. Both PVA and PVA/PU coatings significantly inhibited crack opening and propagation, while the PVA/PU coating exhibited superior performance under cyclic bending conditions. DIC results indicated that the coatings had a limited effect on strain within the bending angle range of 30°-120°, whereas under high-angle bending of 120°-150°, the coatings effectively reduced the maximum strain and strain concentration. These results demonstrated that flexible polymer coatings suppressed damage evolution in the crease zone mainly by enhancing surface continuity, alleviating local strain concentration, and increasing resistance to crack propagation. Polyvinyl alcohol/bio-based polyurethane composite coatings can effectively inhibit the initiation and propagation of surface cracks in white paperboard during creasing and bending, thereby reducing the risk of damage in the creased region.
关键词
白卡纸 /
聚乙烯醇 /
生物基聚氨酯 /
压痕折弯 /
折裂 /
数字图像相关技术
Key words
white paperboard /
polyvinyl alcohol /
bio-based polyurethane /
creasing and bending /
crack /
digital image correlation technique
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