Preliminary analysis on the characteristics of stamps by 3D printing and their stamped impression

IF 2.2 3区医学 Q1 MEDICINE, LEGAL Forensic science international Pub Date : 2024-08-02 DOI:10.1016/j.forsciint.2024.112183

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Abstract

The development of 3D printing technology has brought new risks and challenges to stamp impression identification. To prevent potential risks, a total of 45 stamps were printed using three types of 3D printers: fused deposition molding (FDM) printer, stereo lithography (SLA) printer, and liquid crystal display (LCD)-based SLA 3D printer, including 6 stamps replicated using LCD-based SLA 3D printer. A preliminary study was conducted on the printed stamps and stamped impressions, and the results showed that stamp are influenced by various factors such as printer type, printing material, the technology level of the producer, mold parameters such as font, size, printing parameters, slicing direction, and polishing process, etc., resulting in significant differences in characteristics. However, there are some obviously common characteristics such as missing of strokes, exposure of white and mottled phenomenon in the impression stamped by the 3D produced stamp. The impression of stamp replicated with an LCD 3D printer can be easily identified since it is difficult to achieve consistency with the real impression in detail characteristics.

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初步分析三维打印邮票的特点及其印模。

三维打印技术的发展给邮票印模识别带来了新的风险和挑战。为防范潜在风险，我们使用熔融沉积成型（FDM）打印机、立体光刻（SLA）打印机和基于液晶显示器（LCD）的SLA 3D打印机三种3D打印机共打印了45枚邮票，其中包括使用基于LCD的SLA 3D打印机复制的6枚邮票。对打印出的印章和印模进行了初步研究，结果表明印章受打印机类型、打印材料、制作者技术水平、字体、尺寸等模具参数、打印参数、切片方向、抛光工艺等多种因素的影响，在特性上存在明显差异。不过，三维印章的印迹也有一些明显的共性，如缺笔、露白、斑驳等现象。由于液晶三维打印机复制的印章在细节特征上很难与真实印章保持一致，因此很容易辨别。

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来源期刊

Forensic science international 医学-医学：法

CiteScore

5.00

自引率

9.10%

发文量

285

审稿时长

49 days

期刊介绍： Forensic Science International is the flagship journal in the prestigious Forensic Science International family, publishing the most innovative, cutting-edge, and influential contributions across the forensic sciences. Fields include: forensic pathology and histochemistry, chemistry, biochemistry and toxicology, biology, serology, odontology, psychiatry, anthropology, digital forensics, the physical sciences, firearms, and document examination, as well as investigations of value to public health in its broadest sense, and the important marginal area where science and medicine interact with the law. The journal publishes: Case Reports Commentaries Letters to the Editor Original Research Papers (Regular Papers) Rapid Communications Review Articles Technical Notes.