Shanghai Daoqin Plastics Co., Ltd.

injection mold disadvantages and phenomenon most in in injection molding products quality upper 反映出. injection molding products disadvantages can separation formed lower 列几点:
（1） product injection 不足; （2） product 溢边; （3） product and bubbles; （4） product has 接痕; （5） product 发脆; （6） plastics color; （7） product has silver streaks, and flow marks; （8） product gate mixed 浊; （9） product warpage and shrinkage; （10） product dimensions 不准; （11） product viscous inner; （12） material material viscous runner; （13） nozzle 流涎. lower 面一一叙述 its generate causes and 克服 办 method.

⒈ how to product injection 不足
product material 不足往往 due to material material in 未充满 type front already solid 化, also has other multiple causes.
⑴ equipment causes:
① material in material; ② material shrink separation or full 部堵塞; ③ add material amount 不够; ④ add material control system as positive 常; ⑤ 注 pressure machine 塑化容 amount small; ⑥ equipment formed injection cycle 反常.
⑵ injection molding conditions causes:
① injection pressure low; ② in injection cycle in injection pressure loss large; ③ injection time short; ④ injection full pressure time short; ⑤ injection speed rate slow; ⑥ mold cavity inner material in 断; ⑦ 充模 speed rate and other; ⑧ 操 as conditions formed injection cycle 反常.
⑶ temperature degree causes:
① improve/increase material temperature degree; ② improve/increase nozzle temperature degree; ③ 检查 milli 伏计, hot electrical 偶, electrical retardant electrical hot 圈（ or outer add hot plant/unit ） and add hot system; ④ improve/increase mold temperature; ⑤ 检查 mold temperature control plant/unit.
⑷ mold causes
① runner small; ② gate small; ③ nozzle small; ④ gate 位置不 combined 理; ⑤ gate 数不足; ⑥ cold material small; ⑦ 排 gas 不足; ⑧ mold formed injection cycle 反常;
⑸ material material causes: material material flow property 太差.

⒉ how to product flash material:
product 溢边往往 due to defect formed. other causes has: injection force large clamping force, material material temperature degree high, gas 不足, add material amount, upper has material and other.
⑴ mold issues:
① type and type 芯未闭紧; ② type and type 芯偏移; ③ 模 sheet/plate 不平行; ④ 模 sheet/plate deformation; ⑤ 模子平面落入异 material; ⑥ 排 gas 不足; ⑦ 排 gas large; ⑧ mold formed injection cycle 反常.
⑵ equipment issues:
① products 投影面积 ultra- 注 pressure machine most large injection 面积; ② 注 pressure machine sheet/plate adjustment positive 确; ③ mold 安装不 positive 确; ④ clamping force can maintain 恒定; ⑤ 注 pressure machine sheet/plate 不平行; ⑥ 拉杆 deformation 不均; ⑦ equipment formed injection cycle 反常
⑶ injection molding conditions issues:
① clamping force low ② injection pressure large; ③ injection time long; ④ injection full pressure time long; ⑤ injection speed rate fast; ⑥ 充模 speed rate and other; ⑦ mold cavity inner material in 断; ⑧ add material amount control large; ⑨ 操 as conditions formed injection cycle 反常.
⑷ temperature degree issues:
① material temperature degree high; ② nozzle temperature degree high; ③ mold temperature high.
⑸ equipment issues:
① increase large pressure machine 塑化容 amount; ② make injection cycle positive 常;
⑹ cooling conditions issues:
①部 parts in inner cooling long, 避免由 outer shrinkage, shrink short cooling time; ② will made parts in hot water in cooling.

3, how to product and gas 孔
product usually due to products upper force 不足, material material 充模不足以 and products design combined 理, 凹痕常出现 in and thin versus thick separation. gas 孔 造 formed is due to mold cavity inner plastics 不足, outer plastics cooling solid 化, internal plastics generate shrinkage formed true 空. more semi due to wet property material material drying good, and material material in mono and other combined material formed. gas formed causes, need plastics products bubbles in mold opening 时瞬时出现 also is cooling rear 出现. if mold opening 时瞬时出现, more semi is material material issues, if is cooling rear 出现 则 belongs to or injection molding conditions issues.
（1） material material issues:
① drying material material ② add lubricant ③ reduce material material in material
（2） injection molding conditions issues
① injection amount 不足; ② improve/increase injection pressure; ③ increase injection time; ④ increase full pressure time; ⑤ improve/increase injection speed degree; ⑥ increase injection cycle;
⑦操 as causes formed injection cycle 反常.
（3） temperature degree issues
① material material hot formed amount shrinkage; ② material material cold formed material pressure 实不足; ③ mold temperature high formed 模壁处 material material can very fast solid 化; ④ mold temperature low formed 充模不足; ⑤模子 has local hot 点; ⑥改变 cooling solution/scheme.
（4） mold issues;
① increase large gate; ② increase large separation runner; ③ increase large runner; ④ increase large nozzle 孔; ⑤改进模子排 gas; ⑥ balanced speed rate; ⑦避免充模 material in 断; ⑧ gate material in products thick 壁部位; ⑨ if has can can, decrease/reduce products thick 差异; ⑩模子造 formed injection cycle 反常.
（5） equipment issues:
① increase large pressure machine 塑化容 amount; ② make injection cycle positive 常;
（6） cooling conditions issues:
①部 parts in inner cooling long, 避免由 outer shrinkage, shrink short cooling time; ② will made parts in hot water in cooling.

⒋ how to anti product 接痕（拼缝线）
product usually is due to in 拼缝处 temperature degree low, pressure small formed.
⑴ temperature degree issues:
① material temperature degree low; ② nozzle temperature degree low; ③ mold temperature low; ④ 拼缝处 mold temperature low; ⑤ plastics melt temperature degree 不均.
⑵ injection molding issues:
① injection pressure low: ② injection speed degree slow.
(3) mold issues:
<1>拼缝处排 gas defect; <2>部 parts gas defect; <3> separation runner small; <4> gate small; <5>三 runner Imported 直径太 small; <6> nozzle small; <7> gate 离拼缝处太远, can increase gate; <8> products thick thin, formed solid 化; <9> type 芯偏移, formed mono thin; <10>模子偏移, formed mono thin <11> made parts in 拼缝处太 thin, add thick; <12>充模 speed rate and other; <13>充模 material in 断.
(4) equipment issues:
①塑化容 amount small; ② material in pressure loss large （柱塞式注 pressure machine ）.
(5) material material issues:
① material material 污染; ② material material flow property 太差, add lubricant improvement flow property.

5, how to anti product 发脆
product 发脆往往 due to material material in injection molding process in degradation or other causes.
⑴ injection molding issues:
<1> material temperature degree low, improve/increase material temperature degree; <2> nozzle temperature degree low, improve/increase it; <3> if material material easy thermal degradation, reduce material nozzle temperature degree; <4> improve/increase injection speed degree; <5> improve/increase injection pressure; <6> increase injection time; <7> increase full pressure time; <8> mold temperature low, improve/increase it; <9> made parts internal stress large, decrease/reduce internal stress;
<10> made parts has 拼缝线, method decrease/reduce or remove; <11> screw speed high degradation material material.
⑵ mold issues:
① products design thin; ② gate small; ③ separation runner small; ④ products increase add strong/high 筋, inner 角.
⑶ material material issues:
① material material 污染; ② material material drying good; ③ material material in has material; ④ material material in material more or material 次数太 more; ⑤ material material strong/high degree low.
⑷ equipment issues:
①塑化容 amount small; ② material in has material make material material degradation.

6, how to anti plastics color
material material color usually due to or degradation and other causes.
（1） material material issues:
① material material 污染; ② material material drying good; ③ material material in material more; ④ material material degradation; ⑤ color agent separation understanding; ⑥ additives separation understanding.
（2） equipment issues:
① equipment dry 净; ② material material drying dry 净; ③ ring gas dry 净, color agent and other in in, in material and other upper; ④ hot electrical 偶失灵;
⑤ temperature degree control system 失灵; ⑥ electrical retardant electrical hot 圈（ or outer add hot plant/unit ） loss bad; ⑦ material in has material make material material degradation.
（3） temperature degree issues:
① material temperature degree high, reduce it; ② nozzle temperature degree high, reduce it.
（4） injection molding issues:
① reduce screw speed; ② decrease small back pressure force; ③ decrease small clamping force; ④ reduce injection pressure; ⑤ shrink short injection pressure; ⑥ shrink short full pressure time; ⑦ decrease slow injection speed degree;
⑧ shrink short injection cycle.
（5） mold issues:
①考虑模子排 gas; ② add large gate dimensions, reduce speed rate; ③ add large nozzle 孔, runner and separation runner dimensions; ④ remove inner type and lubricant; ⑤调换 lubricating agent.
another, high impact strong/high degree polystyrene (PS) and ABS如 products internal stress large, due to force color.

7, how to product silver streaks and 斑纹
（1） material material issues:
① material material 污染; ② material material drying; ③ material material pellets 不均.
（2） equipment issues:
①检查 material 筒- nozzle runner system has 无障碍 material and effect/influence material 流; ②流涎, using/adopting elastic nozzle; ③ equipment amount 不足.
（3） injection molding issues:
① material material degradation, reduce screw speed, reduce back pressure force; ② adjustment injection speed degree; ③ increase large injection pressure; ④ add long injection time; ⑤ add long full pressure time; ⑥ add long injection cycle.
（4） temperature degree issues:
① material temperature degree low or high; ② mold temperature low, improve/increase it; ③ mold temperature 不均. ④ nozzle temperature degree high 会流涎, reduce it.
（5） mold issues:
① increase large cold material 穴; ② increase large runner; ③抛 light runner, separation runner, gate; ④ increase large gate dimensions or is gate; ⑤ improvement gas; ⑥ improve/increase mold cavity light degree; ⑦清洁 mold cavity; ⑧ lubricant amount, decrease/reduce it or it; ⑨ remove inner water （模子 cooling formed ）; ⑩ material 流经 凹穴 and increase thick 断面, products design; use gate local add hot.

8, how to product gate mixed 浊
product gate 处出现斑纹 and mixed 浊, usually due to expand 张注入模 type formed “ melt 破碎” 致.
（1） injection molding issues:
① improve/increase material temperature degree; ② improve/increase nozzle temperature degree; ③ decrease slow injection speed degree; ④ increase large injection pressure; ⑤改变 injection time; ⑥ lubricant decrease/reduce or lubricant.
（2） mold issues:
① improve/increase temperature degree; ② increase large gate dimensions; ③改变 gate 形状（扇形 gate ）; ④ increase large cold material 穴; ⑤ increase large separation runner dimensions; ⑥改变 gate 位置; ⑦ improvement gas.
（3） material material issues:
① drying material material; ② remove material material in material.

9, how to product warpage and shrinkage
product warpage and amount shrinkage usually is due to products design 不善, gate 位置不 good and injection molding conditions 致. high force lower orientation is factors.
（1） injection molding issues:
add long injection cycle 间时; amount lower increase large injection pressure; amount lower add long injection time; amount lower add long full pressure time; amount lower increase injection amount; reduce material material temperature degree decrease/reduce warpage; make material material maintain most small degree decrease/reduce warpage; make force orientation maintain most small decrease/reduce warpage; increase large injection speed degree; decrease slow ejection speed degree; made parts 退火; made parts in type upper cooling; make injection cycle positive 常.
（2） mold issues:
①改变 gate dimensions; ②改变 gate 位置; ③ increase gate; ④ increase ejection 面积; ⑤ maintain ejection 均衡; ⑥ need has 足够 排 gas; ⑦ increase thick add strong/high made parts; ⑧ increase add strong/high and 圆角; ⑨校 for dimensions.
products warpage and amount shrinkage for material material and mold temperature degree is for 矛盾. material material temperature degree high, products shrinkage small, warpage large, products shrinkage large, warpage small; mold temperature degree high, products shrinkage small, warpage large, products shrinkage large, warpage small. therefore, must products structure different solution its main/primary 矛盾.

10, how to control product dimensions
product dimensions is due to equipment control 反常, injection molding conditions combined 理, product design good and material material property can has 变化.
（1） mold issues:
①不 combined 理 模子 dimensions; ② products ejection deformation; ③ material material 充模不均; ④充模 material in 断; ⑤不 combined gate dimensions; ⑥不 combined separation runner dimensions; ⑦模子造 formed injection cycle 反常.
（2） equipment issues:
① add material system positive 常（柱塞式注 pressure machine ）; ② screw function positive 常; ③ screw speed positive 常; ④ back pressure adjustment 不均; ⑤ liquid pressure system 止回阀不 positive 常; ⑥ hot electrical 偶失灵; ⑦ temperature degree control system positive 常; ⑧ electrical retardant electrical hot 圈（ or outer add hot plant/unit ）不 positive 常; ⑨塑化容 amount 不足; ⑩ equipment formed injection cycle 反常.
（3） injection molding conditions issues:
① mold temperature 不均; ② injection pressure low, improve/increase it; ③充模不足, add long injection time, add long full pressure time; ④ material temperature degree high, reduce it; ⑤ nozzle temperature degree high, reduce it; ⑥操 as formed injection cycle 反常.
（4） material material issues:
①每批 material material property can has 变化; ② material material material large small random 律; ③ material material dry.

11, how to anti product viscous inner
product viscous inner main/primary due to 模塑不善 ejection 不足, material 不足以 and positive mold design. if products viscous inner, injection molding process can can positive 常.
（1） mold issues:
if plastics viscous inner is due to material 不足造 formed, need using/adopting ejection machine 构; remove 倒切口（陷槽）; remove 凿纹, 刻痕以 and other 伤痕; improvement surface light slip property; light surface as direction and injection direction 一致; increase degree; increase has ejection 面积; ejection 位置; ejection machine 构 操 as; in deep 抽芯模塑 in, reinforcement true bad and gas pressure 抽芯; process in mold cavity is deformation, is deformation; mold opening 时, has 否偏移; decrease small gate dimensions; increase 设辅助 gate; heavy new gate 位置, （13）（14）（15）旨 in decrease/reduce mold cavity inner pressure; balanced more 模槽 充模 speed rate; anti injection 断流; if made parts design 不善, heavy new design; 克服模子造 formed injection molding cycle 反常.
（2） injection molding issues:
① increase demolding agent or improved demolding agent; ②调 positive material material to amount; ③ reduce injection pressure; ④ shrink short injection time; ⑤ decrease/reduce full pressure time; ⑥ reduce mold temperature; ⑦ increase injection cycle; ⑧克服 injection molding conditions formed injection molding cycle 反常.
（3） material material issues:
①清 remove material material 污染; ② material material in add lubricant; ③ drying material material.
（4） equipment issues:
①修缮 ejection machine 构; ② if ejection 行程不足, add long it; ③校 for sheet/plate is 否平行; ④克服 equipment formed injection molding cycle 反常.

12, how to plastics viscous runner
plastics viscous runner is due to and nozzle 圆弧接触面 defect, gate material products demolding and positive filler. usually, runner need large, make made parts demolding gate material still full solid 化.
（1） runner and mold issues:
① runner and nozzle must good; ② ensure nozzle 喷孔不 large runner 注口直径; ③抛 light runner; ④ increase runner degree; ⑤调 positive runner 直径; ⑥ control runner temperature degree; ⑦ increase gate material force; ⑧ reduce mold temperature degree.
（2） injection molding conditions issues:
① using/adopting runner 切断; ② decrease/reduce injection material; ③ reduce injection pressure; ④ shrink short injection time; ⑤ decrease/reduce full pressure time; ⑥ reduce material material temperature degree; ⑦ reduce material temperature degree; ⑧ reduce nozzle temperature degree;
（3） material material issues: ①清理 material material 污染; ② drying material material.

13, how to anti nozzle 流涎
nozzle main/primary due to material material hot, viscosity small.
（1） nozzle and issues:
① using/adopting elastic 簧针阀式 nozzle; ② using/adopting degree nozzle; ③ decrease small nozzle 孔; ④ increase cold material 穴.
（2） injection molding conditions issues:
① reduce nozzle temperature degree; ② using/adopting runner 切断; ③ reduce material material temperature degree; 600 ④ reduce injection molding pressure; ⑤ shrink short injection time; ⑥ decrease/reduce full pressure time.
（3） material material issues:
①检查 material material is 否污染; ② drying material material.