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.