常见啤塑缺陷及原因分析.ppt

常見啤塑缺陷及原因分析 COMMON INJECTION DEFECTS AND THE REASON ANALYSIS * * Flashing Sink Marks Phenomena 現象 Inferior Sample 不良樣本 Molding Machine, Molding Condition 啤塑條件 Mold, Material 模具,材料 披鋒 ? High Injection Pressure 啤塑壓力高 Lack of Clamping Force 鎖模力不足 Excessive Supply of Molding Material 熔料過多 High Resin Temperature 料溫過高 Long Holding Time of Injection Pressure 保壓時間太短 ? No Mold Align or Lack of Contact of Parting Surface 模具不對中或分型面接 Excessively Large Projected Area of Mold Cavity 型腔投影面積太大 Low Resin Viscosity During Molding 啤塑期間溶料粘度低 縮水 ? Low Injection Pressure 啤塑壓力偏低 Short Holding time of Injection Pressure 保壓時間太短 Slow Injection Speed 啤塑時間太慢 Small Supply Amount of Molding Materials 熔料不足 High Resin Temperature 熔料溫度高 Excessively High or Uneven Mold Temperature 模具溫度過高或不穩定 Small Gate 水口偏小 Existence of Resistance Due to Narrow Runner and Sprue 流道,分流道狹窄而引起的阻力 Thick Section is Provided in the Cavity 收縮處截面偏厚 High Resin Shrinkage Ratio 村料收縮率高 Silver Streaks and Spray marks 銀紋,料花 ? Inferior Plasticizing 塑化不良 Resin is Overheated and Resolved 熔料過熱分解 Excessively High Injection Speed 啤塑壓力過高,啤塑速度太快 Excessively High Injection Pressure and Injection Speed is Too Fast 啤塑壓力過高,蜱塑速度太快 Air Inside Screw (Lack of Back Pressure and Compression) 啤塑螺杆中有空氣 Low Mold Temperature 模具溫度低 Lack of venting 排氣不良 Incorrect Gate placement 水口位置不當 Inferior Cavity Design 模腔干燥不合理 Insufficient Resin Drying 膠料干燥不充分 ? ? flow Marks 流動紋/走水紋 ? Temperature Too Low and Lack of Fluidity 溫度太低,流動性差 Slow Injection Speed 啤塑速度 Excessively Small Nozzle 噴嘴過小 Injection Holding Pressure Too Low 保壓壓力太低 Mold Temperature Too Low 模具溫度太低 Improper Mold Cooling 模具冷卻不合理 Resin Does Not Flow Well 熔料流動性差 oudy, Appearance Phenomena 現象 Inferior Sample 不良樣本 Molding Machine, Molding Condition 啤塑條件 Mold, Material 模具,材料 色澤陰暗 ? Uneven Melting of Partially Overheated Resin 料溫太低,流動性差 Cold Nozzle 噴嘴溫度低 Excessively High or low Injection Speed 過高或過低的注射速度 Overheated Resolution of Resin 熔度過熱分解 ? Excessively High or Excessively Low Mold T