Shanghai Daoqin Plastics Co., Ltd.

main/primary for currently molding product generate defect has causes add analysis 判断, in molding machine, injection molding parts mold and raw materials provide factors from has control defect generate, reduce production cost. inner 容: 1 起疮: （银 color strip/profile 纹） formed product surface, 以CATE is in 心, has very more white strip/profile 痕, basic upper is raw materials flow direction generate. this type of phenomenon is many defect conditions rear 发生, has need true positive causes very difficult. 1．1 raw materials in if has water separation or other formed separation, separation dry, surface upper generate very more strip/profile. 1．2 raw materials in mixed its it raw materials 时, 也会形 formed 起疮, its 形状呈云母状 or 针点状, easy and its it causes formed separation 别. 1．3 raw materials or material tube/pipe 不清洁时, easy this type of 情况. 1．4 injection shot time long, 初期射入 to inner raw materials temperature degree low, solid 化 结果, make formed separation troubleshooting, especially for temperature degree raw materials, 发常会出现 this type of 状况. 1．5 if mold temperature low, raw materials solid fast easy 发生（1. 4）之状况, make formed separation 不会排出 remove. 1．6 injection molding parts mold gas defect 时, raw materials 进入时 gas easy troubleshooting, generate 起疮, this type of 状况, formed product 顶部往往会烧黑. 1．7 injection molding parts mold upper if water separation, 则充填 raw materials belt/tape hot will its 蒸发, and melt raw materials melt combined, formed 起疮, white 雾状. 1．8 胶道 cold material has cold material or small, injection shot 时, cooling raw materials belt/tape 入模穴 inner, separation speed solid formed thin 层, rigid production mold temperature low 也会开 formed 起疮. 1．9 raw materials in process in, 因模穴面接触部 separation cold formed thin 层, also by rear raw materials melt separation understanding, formed white or 污痕状, more thin housing/shell product. 1．10 充填时, raw materials formed 乱流状 can, make raw materials 流径路线延 long, 并受模穴 inner structure effect/influence generate abrasion scratch add 之充填 speed degree ratio raw materials cooling speed degree fast, GATE位置处于筋骨处 or small easy generate 起疮, formed product thick 急剧化 方也容 easy generate 起疮. 1．11 GATE以 and runner small or deformation, speed degree fast, generate abrasion scratch make temperature degree rise formed raw materials separation understanding. 1．12 raw materials in has recycled material, separation dry, injection shot separation understanding, generate 起疮. 1．13 raw materials in material tube/pipe in time 久, formed separation hot separation understanding. 1．14 back pressure 不足, 卷入空 gas （ pressure shrink ratio 不足）. 起疮: table/sheet molding machine can can force 不足. resin hot separation understanding （ material tube/pipe temperature degree ） material tube/pipe inner raw materials 停留久, formed separation hot. injection shot pressure high. screw 卷入空 gas （ back pressure 不足）. mold injection molding parts mold inner gas defect. injection molding parts mold temperature degree low. cold material 窝存储 small. GATE small or deformation. injection molding parts mold surface has water separation. 模穴 形状 defect （横截面 or thick relatively more relatively 急）. raw materials raw materials in water separation and formed separation. raw materials dry 不足. mixed its it raw materials. 2 会胶线 会胶线 is raw materials in combined generate fine small 线, due to full melt combined generate, formed product positive, 反面都 in 同一部位 upper fine 线, if injection molding parts mold temperature degree high, and its 接触 会胶线 ratio 另一方 shallow. 1 improve/increase raw materials temperature degree, increase injection shot speed degree 则会胶线 decrease small. 2 improve/increase injection molding parts mold temperature degree, make raw materials in injection molding parts mold inner flow property increase,则 raw materials combined temperature degree relatively high, make its 会胶线 decrease small. 3 CATE 位置决定会胶线 位置, basic upper 会胶线 位置都进胶 direction 一致. 4 injection molding parts mold in has or its it easy formed separation,则 it in in combined melt combined separation formed 会胶线, 5 受 injection molding parts mold structure effect/influence,完 full remove 会胶线 is can can, therefore machine need in remove 会胶线方面,而 is will 会胶线 generate defect phenomenon control in most small degree, this more is important.会胶线: table/sheet molding machine raw materials temperature degree low, flow property injection shot pressure low injection shot speed degree slow cold material or long 灌嘴处 deformation formed retardant force large (pressure loss 失) mold injection molding parts mold temperature degree low injection molding parts mold inner gas defect GATE defect GATE runner small from GATE to 会胶线 generate 位置 距离 long (L/T 关系) injection molding parts mold temperature degree balanced raw materials raw materials flow property defect raw materials solid speed degree fast raw materials dry 不足3 bubbles formed product thick internal generate 空隙,不 transparent product can from outer to,必 must will its rear can to. thick in is cooling most slow 方, therefore speed cooling, fast speed shrinkage surface will raw materials 拉引起 generate 空隙,形 formed bubbles.1 injection shot pressure can can high, decrease/reduce raw materials shrinkage. 2 molding product upper thick 变化急剧时, separation cooling speed degree different, easy rear bubbles. 3 due to 停滞空 gas causes generate bubbles. 4 GATE small, formed product thick fast. 5 in GATE solid front, must maintain separation pressure. bubbles: table/sheet molding machine raw materials temperature degree high, gas generate machine more injection shot pressure low injection shot speed degree fast or slow holding pressure low holding pressure time short holding pressure 转换位置太 fast raw materials temperature degree low, flow property low back pressure cooling time long mold injection molding parts mold temperature degree low injection molding parts mold gas defect GATE, runner small raw materials dry raw materials shrinkage ratio rate large 4 warpage: injection shot 时, injection molding parts mold inner resin to high pressure generate internal force, demolding rear, formed product 两旁出现 deformation bending, thin housing/shell molding product easy generate deformation. 1 molding product also has separation cooling 时, ejection, through for surface add pressure, therefore formed warpage or deformation. 2 molding product cooling speed degree non-uniform 时, cooling slow shrinkage amount add large, thin separation raw materials cooling speed, viscosity improve/increase, warpage. 3 injection molding parts mold cooling water 路位置 separation non-uniform, must more temperature degree or use more mold temperature machine adjustment. 4 injection molding parts mold water 路配置 relatively more injection molding parts mold, most good use mold temperature machine separation control, already to temperature degree. warpage: table/sheet molding machine raw materials temperature degree low, flow property holding pressure high holding pressure time long injection shot pressure high injection shot speed degree slow cooling time short mold injection molding parts mold temperature degree low injection molding parts mold upper has temperature injection molding parts mold cooling non-uniform, separation demolding defect raw materials raw materials flow property 不够5 flow marks: raw materials in inner flow 时, in formed product surface upper 出现以GATE is in year fine small phenomenon. 1 increase raw materials temperature degree and injection molding parts mold temperature degree, make raw materials easy flow. 2 充填 speed degree slow, in process in temperature degree decline, 而发生 this type of phenomenon. 3 if long, in 灌嘴处 temperature degree decline, therefore, cooling raw materials most injection shot, pressure decline, formed flow marks. 4 cooling small, injection shot 初期, temperature degree low raw materials by 先充填造 formed flow marks. flow marks: table/sheet molding machine raw materials temperature degree low, flow property injection shot speed degree fast or slow 灌嘴孔径 small or long injection shot pressure low holding pressure holding pressure time short mold injection molding parts mold temperature degree low injection molding parts mold cooling 不适当GATE small or runner small cold material 窝存储 small raw materials raw materials flow property defect 6 欠肉 formed product 未充填完整, has separation less can, as is its causes is has below/following 几点: 1 formed product large, machine injection shot amount can can force 不足, need selection can force large machine 台. 2 injection molding parts mold gas 效果不佳, inner gas if has in injection shot troubleshooting, due to 残留空 gas causes make 充填不完整, has generate phenomenon. 3 模穴 inner, raw materials flow long, or has thin 壁 部 separation, in raw materials 充填结束 front cooling solid 化. 4 injection molding parts mold temperature degree low, easy formed 欠肉, is improve/increase mold temperature cooling time long, formed molding cycle time long, therefore, must from and production efficiency related degree 决定适当 mold temperature. 5 熔 melt raw materials temperature degree low or injection shot speed degree slow, raw materials in 未充满模穴之 front solid 化而造 formed short phenomenon. 6 灌嘴孔径 small or long, need improve/increase temperature degree, decrease small its flow retardant force, selection can can short, selection 灌嘴孔径 small or long, not only make its flow abrasion scratch retardant force add large, but also due to retardant force function make speed degree decrease slow, raw materials front solid 化. 7 formed product 模穴数 amount relatively more, amount balanced, need 设整GATE large small control, GATE small retardant force large 往往会欠肉, has hot system, can mono adjustment certain 欠肉模穴 temperature degree control. 8 injection shot pressure low, formed short shot. 欠肉: table/sheet molding machine injection shot can force （容 amount, can can force ）不足 raw materials material amount 不足（计 amount 不足） injection shot pressure low raw materials temperature degree low, flow property injection shot speed degree slow deformation （ temperature degree 孔径） pressure loss holding pressure pressure 转换位置 fast injection shot time setting short 逆止阀破裂 screw large, injection shot pressure low 灌嘴处溢 material mold GATE or runner balanced defect （ therefore meanwhile 充填） injection molding parts mold gas defect GATE deformation or runner small （ pressure loss 失） injection molding parts mold temperature degree low （ raw materials temperature degree decline to melting point below/following ）模穴壁 thick thin （ and L/T 关系）GATE 位置不适当 injection molding parts mold cooling 不适当 raw materials raw materials flow property 不足7 flash/burrs formed product more plastics phenomenon, more in injection molding parts mold clamping 处, 顶针处, slip block and other active 动处. 1 slip block and block if abrasion loss, easy flash/burrs. 2 injection molding parts mold surface 附著异 material 时, 也会出现 flash/burrs. 3 clamping force 不足, injection shot injection molding parts mold by 打开, flash/burrs. 4 raw materials temperature degree and injection molding parts mold temperature degree high, viscosity decline, therefore in injection molding parts mold has upper easy generate flash/burrs. 5 material amount to more, raw materials more injection shot generate flash/burrs. flash/burrs table/sheet molding machine amount more (separation 充填) injection shot pressure high injection shot speed degree fast raw materials temperature degree high clamping force low injection shot time long holding pressure pressure high holding pressure pressure 转换位置 slow amount 不准确, has 误差(back pressure, screw speed) machine solid, sheet/plate can sheet/plate defect mold clamping 面接触 defect injection molding parts mold 接触面 upper has material inner has injection molding parts mold temperature degree high injection molding parts mold rigid property defect （ strong/high degree 不足） sliding 部位间隙配 combined defect injection molding parts mold structure design raw materials raw materials flow property good 8． sink marks due to shrinkage, thick surface raw materials by 拉入, 因化时, in formed product surface 出现凹陷痕迹. sink marks is formed product surface defect phenomenon in most more, large more 发生于壁 thick 处, generally if pressure decline shrinkage machine rate relatively large. 1． injection molding parts mold design 时, need remove necessary thick degree, generally must can can make molding product thick uniform; 2． if molding temperature degree high, thick 处, 筋骨处 or 凸起处反面容 easy sink marks, this is is easy cooling solid 化, difficult cooling separation raw materials that 移动, amount will sink marks control in effect/influence formed product quality 方. 3． generally reduce molding temperature degree, injection molding parts mold temperature degree decrease/reduce raw materials shrinkage, 但势必 increase pressure. sink marks table/sheet molding machine injection shot time short （GATE未 solid 化时, holding pressure 就会结束） holding pressure low amount holding pressure 位置转换太 fast injection shot pressure low injection shot speed degree slow cooling time short raw materials temperature degree high 逆止阀破 loss 灌嘴孔径 deformation （ pressure loss 失） or material injection molding parts mold injection molding parts mold temperature degree high injection molding parts mold cooling non-uniform （ injection molding parts mold separation high ）GATE small injection molding parts mold structure design 顶针不适当 raw materials raw materials shrinkage rate large 9．不 easy demolding （顶凸） injection molding parts mold 打开时 formed product in demolding, ejection 时, or formed product. if injection molding parts mold defect, viscous 于静模. 1． injection molding parts mold gas defect or gas 槽（排 gas 槽位置不 for or deep degree 不够）造 formed demolding 不顺利; 2． injection shot pressure high, deformation large, shrinkage non-uniform, for demolding; 3． adjustment injection molding parts mold temperature degree, for anti demolding has 效, make molding product cooling shrinkage rear, 以便于 demolding, is, if shrinkage degree, in upper easy demolding, therefore, must maintain most mold temperature. generally, mold temperature ratio mold temperature high 出5℃—10℃ left right, 视实际状况而定. 4． 灌嘴 and in if for 不准, 孔偏移 or 灌嘴孔径 large 于胶道孔径, 均会造 formed demolding 不顺. demolding table/sheet molding machine raw materials temperature degree high injection shot pressure high injection shot time long holding pressure time long cooling time short holding pressure high injection molding parts mold injection molding parts mold demolding 角不够 injection molding parts mold temperature degree high injection molding parts mold gas defect injection molding parts mold cooling non-uniform 灌嘴孔径 large 于胶口孔径灌嘴偏移 raw materials raw materials flow property raw materials shrinkage rate small