Supplementary material for "Polymer extrusion processes in tire manufacturing: a systematic review and bibliometric analysis"

The supplementary materials include: (i) the enriched Scopus-Web of Science dataset analysed in this study; (ii) the Python pipeline used for data cleaning, metadata enrichment, and bibliometric analysis; (iii) the rule-based Python script used to construct the broad tire-extrusion subset and the technology-focused strict and technology-dense subsets; and (iv) additional sensitivity figures, including the DE thematic map for the technology-dense subset and the full list of frequent keywords.本研究的补充材料包含以下内容：(i) 本研究中所分析的经富集处理的Scopus-Web of Science（斯科普斯-科学网）数据集；(ii) 用于数据清洗、元数据富集以及文献计量分析的Python数据处理流水线；(iii) 用于构建广义轮胎挤出子集、聚焦技术的严格子集与技术密集子集的基于规则的Python脚本；(iv) 额外的敏感性分析图表，其中包括技术密集子集的DE主题图（Differential Expression）以及高频关键词完整列表。