Shanghai Daoqin Plastics Co., Ltd.

PA easy wet, processing front need separation drying, water amount control in 0.3% below/following. raw materials drying good, products gloss high, comparison coarse 糙, PA不会随受 hot temperature degree rise high 而逐渐 soft 化, is in 一 靠近 melting point relatively narrow temperature degree scope/range inner soft 化, melting point very obvious, temperature degree 一旦达 to 就会出现 flow （ and PS, PE, PP and other material different ）.

PA viscosity ratio its it thermoplastic property plastics low, its temperature degree scope/range relatively narrow （仅5℃ left right ）. PA flow property good, easy molding, easy 走披锋. nozzle easy 出现“流涎” phenomenon, 抽胶需 large 一点. PA melting point high, solid high, material in mold inner 随时会因 temperature degree drop to melting point below/following solid, 妨碍充模 molding formed. therefore, must using/adopting high speed injection, （ thin or long process/workflow made parts especially this 样）. nylon mold need has relatively separation gas measures.

PA in melt 状态时, heat stabilized property relatively 差, easy degradation. material temperature degree ultra- 300℃, material in material inner add hot time ultra- 30 separation 钏, PA for mold temperature requirements relatively high, can utilizing mold temperature high low control its crystallization property, obtain property can.

PA material mold temperature in 50-90℃ relatively good, PA1010 processing temperature degree in 220-240℃ is 宜, PA66 processing temperature degree is 270-290℃. PA products has according to quality requirements 进行“退火处理” or “调 wet 处理”.

PA12 polyamide (PA) 12 or nylon 12 processing front ensure wet degree in 0.1% below/following. if material is in gas in 储存, need in 85C hot gas in drying 4~5 small 时. if material is in container in 储存, that 么经 3 small temperature degree balanced can use. temperature degree 240~300C; for/regarding features material need ultra- 310C, for/regarding has flame retardant features material need ultra- 270C. mold temperature degree: for/regarding reinforcement type material is 30~40C, for/regarding thin or large 面积元 parts is 80~90C, for/regarding reinforcement type material is 90~100C. increase temperature degree will increase material crystallization degree. control mold temperature degree for PA12 说 is very important. injection pressure: most large can to 1000bar（建议 use low holding pressure pressure and high temperature degree ）. injection speed degree: high speed （ for/regarding has additives material more good ）. runner and gate: for/regarding add additives material, due to material viscous property relatively low, runner 直径应 in 30mm left right. for/regarding reinforcement type material requirements 5~8mm large runner 直径. runner 形状应当 full is 圆形. 注入口应尽 can can short. can use multiple gate. large type parts need use small gate, this is is for parts high pressure or large shrinkage rate. gate thick degree most good and parts thick degree versus and other. if use 潜入式 gate, most small is 0.8mm. hot runner mold very has 效, is requirements temperature degree control very 精确以 anti material in nozzle 处渗漏 or solid. if use hot runner, gate dimensions ratio cold runner need small 一.

PA6 polyamide (PA) 6 or nylon 6: due to PA6 very easy absorption water separation, therefore processing front drying especially need attention/notes. if material is use anti water material packaging supply, container maintain 密闭. if wet degree large 于0.2%, in 80C above hot gas in drying 16 small 时. if material already in gas in ultra- 8 small 时, 建议进行105C, 8 small above true dry. temperature degree: 230~280C, for/regarding reinforcement product types is 250~280C. mold temperature degree: 80~90C. mold temperature degree very significantly effect/influence crystallization degree, crystallization degree also effect/influence parts machine features. for/regarding structure parts crystallization degree very important, therefore mold temperature degree is 80~90C. for/regarding thin 壁, process/workflow relatively long parts 也建议施 use relatively high mold temperature degree. increase large mold temperature degree can improve/increase parts strong/high degree and rigid degree, reduce tough property. if thick large 于3mm, use 20~40C low temperature mold. for/regarding reinforcement material mold temperature degree large 于80C. injection pressure: generally in 750~1250bar between （取决于材 material and product design ）. injection speed degree: high speed （ for reinforcement type material need micro reduce ）. runner and gate: due to PA6 凝 solid time very short, therefore gate non important. gate 孔径不 need small 于0.5*t（ this 里t is parts thick degree ）. if use hot runner, gate dimensions ratio use runner small 一, is hot runner can 够帮助 retardant material solid. if use 潜入式 gate, gate most small 直径应当 is 0.75mm.

PA66 polyamide (PA) 66 or nylon 66 if processing front material is 密封, that 么就没 has necessary drying. however, if container by 打开, that 么建议 in 85C hot gas in drying 处理. if wet degree large 于0.2%, also need 进行105C, 12 small true drying. temperature degree: 260~290C. for additives product is 275~280C. temperature degree 应避免 high 于300C. mold temperature degree: 建议80C. mold temperature degree will effect/influence crystallization degree, crystallization degree will effect/influence product material features. for/regarding thin parts, if use low 于40C mold temperature degree, parts crystallization degree will time 而变化, is maintain parts stability property, need 进行退火处理. injection pressure: usually in 750~1250bar, 取决于材 material and product design. injection speed degree: high speed （ for/regarding reinforcement type material low 一 ）.

runner and gate: due to PA66 凝 solid time very short, therefore gate non important. gate 孔径不 need small 于0.5*t （ this 里t is parts thick degree ）. if use hot runner, gate dimensions ratio use runner small 一, is hot runner can 够帮助 retardant material solid. if use 潜入式 gate, gate most small 直径应当 is 0.75mm.