Photopolymer Resin Direct Casting: Wax-free Burnout
光固化树脂直铸：免蜡烧尽工艺
标签：树脂直铸, 光固化, 烧尽曲线, 灰分控制
Castable 光敏树脂打印的首饰模可整体替代蜡模：树脂灰分须 <0.1%，否则残渣堵住型腔。关键在两段升温烧尽曲线——先 100–150℃ 缓升 2 h 使树脂软化，再 730–750℃ 保温 2–4 h 彻底碳化排出；快速升温会让树脂沸腾胀裂石膏型。烧尽后观察浇口杯内壁洁白无灰即为合格，随后常规真空浇注。新树脂品牌务必先烧样片验证。
Castable photopolymer patterns replace wax outright: resin ash must be under 0.1% or residue blocks the cavity. Success lies in a two-stage burnout — ramp slowly 100–150°C for 2 h to soften the resin, then hold 730–750°C for 2–4 h to fully carbonize and vent it; fast ramps boil the resin and split the plaster flask. After burnout the cup interior should be clean white with no ash; cast normally under vacuum. Always burn a test coupon before committing a new resin brand. ---