Reinforcement materials are an essential component of leather goods. They provide support, structure, and protection to the leather and can be used to change its drape and handling. The nonbiodegradability of existing reinforcements in leather goods and the high cost of materials are major challenges. The objective of this study is to fabricate reinforcement materials from sisal fiber with a face‐centered central composite design. The main factors involved in the experiment with their respective levels are polyvinyl alcohol in grams (30, 35, and 40), sisal fiber in grams (20, 22, and 24), and binder in milliliters (mL) (10, 15, and 20). The dependent variables studied are tensile strength, tear strength, and elongation at the break of reinforcement material. The results of the experiment revealed that as the amount of fiber increased by 14%, the tensile strength of reinforcement material increased by 5%, and as the fiber loading increased by 16%, elongation at break decreased by 30%. However, as the fiber loading increased to 15%, the tear strength of the material decreased by 35%. Increasing the amount of polyvinyl alcohol (PVA) in the reinforcement material by 50% increased elongation at the break by 15% and reduced the tear strength by 3% and the tensile strength by 10%. Varying the amount of binder did not affect the tensile and tear strength of the reinforcement material; however, it had a positive effect on the elongation of the material. The reinforcement material produced from sisal fiber has a comparable quality parameter to commercially available synthetic‐based materials, and it could be used in leather goods production.

Leather is a flexible, long-lasting material composed of interwoven collagen fibers that are used to make footwear, apparel, and other leather goods. This study examines the impacts of the direction of leather, stitch density, and thread size on the seam strength of cow-upper leather. The Taguchi design of experiment and ANOVA methods have been employed to evaluate and examine the seam strength of cow upper leather. The study employed control variables ranging from 6 to 12 SPI for stitch density, 60/2, 40/2, and 40/3 thread sizes, and parallel, perpendicular, and diagonal leather direction. The strongest seams are produced with stitch densities of 12 SPI, thread sizes of 40/3, and parallel orientations. According to the results of the study, the seam strength of cow upper leather was significantly impacted by the stitch density or the number of stitches per inch. Based on the Taguchi design of the experiment and the ANOVA result of cow upper leather the stitch density increases and the seam strength also increases. From the graph of the S/N ratio, the slope is higher in higher significant stitch density. As the stitch density increases the seam performance also increases (when the stitch density is 6 SPI, S/N ratio 54.67 N, and when the stitch density is 12 SPI, S/N ratio 59.15 N). Based on these findings, several recommendations are presented. These include determining the optimal stitch density range, selecting appropriate thread sizes, considering stitching direction, implementing quality control measures, fostering collaboration, and encouraging further research