Textile Engineering, Chemistry and Science, Wilson College of Textiles, North Carolina State University, Raleigh, NC, USA.
Center for Materials Innovation and Future Fashion, College of Design and Social Context, RMIT University, Melbourne, Australia.
J Forensic Sci. 2021 Jul;66(4):1246-1256. doi: 10.1111/1556-4029.14702. Epub 2021 Mar 16.
Bloodstain pattern analysis (BPA) for stains found on non-porous surfaces has matured into a powerful forensic science tool based on fluid mechanics principles. The same cannot be said when bloodstains are found on porous substrates, such as textiles. This is partially due to the complex nature of textiles with tens of thousands of different materials in addition to unknown wear characteristics. In this study, three single jersey knit fabrics were manufactured from 100% cotton ring-spun yarns of linear densities of 12, 20, and 30 Ne (492, 295, and 197 dtex, respectively) and nearly identical twist multipliers. Single drops of porcine blood of 2, 10, 30, and 60 µL were allowed to fall 1 cm (to eliminate the impact of blood velocity) onto each fabric to understand the effects of yarn size on wicking and bloodstains. The size of the stain was then measured and compared for different fabrics and blood drop sizes. Wicking of blood into the fabric was fastest for the largest yarn fabrics, but more extensive wicking occurred on finer yarn fabrics resulting in much larger stains. All stains were highly altered due to wicking of blood. The findings from this paper might help the forensic scientists in understanding wicking in textiles and comparing stains on different textiles to gain a better understanding of bloodstains on textiles.
基于流体力学原理，非渗透性表面上发现的血痕分析（BPA）已经成熟为一种强大的法医学工具。但是，当血痕出现在多孔基质上，如纺织品上时，情况就并非如此了。这部分是由于纺织品的复杂性，除了未知的磨损特征外，还有成千上万种不同的材料。在这项研究中，使用线性密度为 12、20 和 30 特克斯（分别为 492、295 和 197 分特克斯）且捻度倍数几乎相同的 100%纯棉环锭纺纱线制造了三种单针织物。让直径为 2、10、30 和 60 微升的猪血单滴从 1 厘米高处落下（以消除血液速度的影响）到每种织物上，以了解纱线尺寸对吸血和血斑的影响。然后测量并比较不同织物和血滴大小的斑点大小。对于最大纱线织物，血液吸入织物的速度最快，但在更细的纱线织物上会发生更广泛的吸血，从而导致更大的斑点。所有的斑点都由于吸血而高度改变。本文的研究结果可能有助于法医学家理解纺织品中的吸血，并比较不同纺织品上的斑点，以更好地了解纺织品上的血斑。
