Copper + Leather: Fold-formed Closures for Vegetable-tanned Leather
铜＋皮：折叠铜扣件与植鞣革的结合
标签：铜+皮, 折叠扣, 皮具, 混合材料
折叠成型的天然折缝自带弹簧回紧力，适合做皮具扣件：0.9 mm 铜片折出 S 形或书夹形扣舌，折缝替代冲压五金的弹片；与 3.5–4 mm 植鞣革连接采用缝合式——铜件边缘折出 2 mm 包边并冲 φ1 mm 线孔，用亚麻蜡线交叉缝入皮革，避免铆钉应力集中撕裂皮面。铜面做旧后上蜂蜡，皮革接铜处每季补貂油；折缝根部是应力最高点，量产前须做 500 次开合疲劳测试。
The natural crease of a fold works as its own spring, ideal for leather closures: fold 0.9 mm copper into an S or book-clasp tongue, the crease replacing a stamped spring. Stitch it to 3.5–4 mm vegetable-tanned leather—turn a 2 mm hem at the copper edge, punch φ1 mm stitching holes and saddle-stitch with waxed linen, avoiding rivet stress that tears the hide. Wax the patinated copper, feed the leather at the joint quarterly, and fatigue-test the crease root—the highest-stress point—for 500 open-close cycles before production.