Enjection problems and troubleshooting (2)

Enjection problems and troubleshooting (2)

2022.08.19

Enjection problems and troubleshooting (2)

四. Sprue sticking 澆道 (水口) 黏模 During injection, sprue gets sticking, the sprue cannot fall off when the mold is opened. 注塑時，澆道粘連，開模時澆道不能脫落。
Possible Cause	Correction action
Injection pressure too high 射出壓力太高	Reduce injection pressures 降低射出壓力
Melt material temperature too high 料溫太高	Reduce material melt temperature 降低料溫
Sprue diameter too long 澆道過大	Modify the mold 修改模具
Not enough sprue cooling time 澆道冷卻時間不夠	1. Add cooling time 延長冷卻時間 2. Reduce barrel temperature 降低料管溫度
Draft angle too small 澆道脫模角不夠	Increase angle 修改模具增加角度
Sprue bushing and nozzle dismatched 澆道凹弧與射嘴之配合不正	Adjust to match 重新調整與配合
Sprue surface not smooth 澆道內表面不光滑	Maintain the mold 檢修模具
Undercuts 脫模倒角	Maintain the mold 檢修模具
Damage sprue 澆道外孔有損壞	Maintain the mold 檢修模具
No sprue puller pin 無澆道抓鎖	Add sprue puller pin 加設抓銷
Over filling 填料過飽	1. Reduce injection volume 降低射出量
	2. Shorten injection time 減短射出時間
	3. Slow injection speed 降低射出速度

五. Flash 毛頭(毛邊) 、披風 When melt plastic flows out of the cavity at the parting line or between inserts, excess are formed on surface of molded product 當熔融塑料在分型線或嵌件之間流出型腔時，成型品表面形成多餘的料邊
Possible Cause	Correction action
Melt plastic temperature too high 原料溫度太高	1. Reduce melt temperature 降低原料溫度
Melt plastic temperature too high 原料溫度太高	2. Reduce mold temperature 降低模具溫度
Injection pressure too high 射出壓力太高	Reduce injection pressure 降低射出壓力
Filling too much 填料過飽	1. Reduce injection volume 降低射出量
	2. Shorten injection time 減短射出時間
	3. Slow injection speed 降低射出速度
Poor melding line or bad sealing surface 合模線或靠密面不良	Maintain the mold 檢修模具
Low clamping pressure 鎖模壓力不夠	Raise clamping pressure 增加鎖模壓力
Hold pressure too long 保壓時間過長	Reduce hold pressure time 減少保壓時間
Injection speed too fast 射出速度過快	Slow injection speed 降低射出速度
Melt plastic flow too fast 塑膠原料流動性太好	Change plastic 更換原料

六. Cracking or Crazing 開模時或頂出時成品破裂 A breakage occurs when the mold is opened or product is ejected 開模或頂出產品時發生破損
Possible Cause	Correction action
Overfeed material 填料過於飽和	1. Reduce shot volume 降低射出量
	2. Reduce injection time 減短射出時間
	3. Reduce injection time 降低射出速度
	4. Reduce enjection pressure 降低射出壓力
Hold pressure too long 保壓時間太長	減少保壓時間
Mold temperature too high 模溫太低	升高模溫
Insufficient draft allowance 脫模斜度不足	Check the mold 檢修模具
Gate diameter too small 澆口太小	Check the mold 檢修模具
Ejector pin too small or wrong position 頂針不夠或位置不當	Check the mold 檢修模具
Mold Undercuts 模具有倒鉤	Check the mold 檢修模具
Excessive Moisture in material 材料吸濕性良好	1. Dry material 進行烘料
Excessive Moisture in material 材料吸濕性良好	2. Change plastic material 更換塑膠原料
Vacuum occurs when mold is drafted 脫模時模具產生真空現象	1. Slow to open mold or reduce eject speed 降低開啟模具或頂出的速度
Vacuum occurs when mold is drafted 脫模時模具產生真空現象	2. Use intake equipment 使用進氣設備

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