Shanghai Daoqin Plastics Co., Ltd.

introduction transparent ABS products injection molding parts molding features, effect/influence products transparent degree factors, combined transparent ABS medical grade bottle 体 实际 application,提出 versus solution methods. 1 引言 transparent ABS new material tool has high flow property and low shrinkage rate, processing properties and product dimensional stability relatively good, and chemical resistant property can relatively good, therefore, transparent ABS new material has in can force formed is polycarbonate (PC) substitute/replace material. due to for transparent ABS development and application relatively 晚, in raw materials development, molding equipment and process research and other and outer versus ratio also in 一定 差距, make production injection molding product transparent property 差, to 预期 效果. 本文针 for effect/influence transparent ABS injection molding product transparent property factors discussion, 并提出 versus 应 提 high transparency property methods. 2 transparent property types material transparent property good bad, has many property can indicators need 考虑. commonly used indicators has: light transmittance, degree, light 指数, di and color dispersion and other. in upper indicators in, light transmittance and degree is most is important 2 indicators, main/primary table/sheet material light property. 2. 1 light transmittance light transmittance is table/sheet resin transparent degree important property can indicators,一 types resin light transmittance high, its transparent property good. light transmittance is: 透 材 material light amount and to material surface upper light amount separation rate. 2. 2 雾 degree degree also is degree, it can amount transparent or semi transparent material 不清晰 or mixed 浊 程 degree. degree generate is due to material internal or outer surface light dispersion formed 云雾状 or mixed appearance. degree is: 透 材 material dispersion light amount and 透 材 material light amount separation rate. upper introduction light transmittance and degree is amount material transparent property important indicators, 两者 关系如 lower: generally 说, light transmittance and degree between formed ratio 关系, light transmittance high material, its degree low,反之亦然. 3 transparent ABS transparent mechanism transparent ABS is in 普通ABS upper development 起, in its formed separation in add transparent agent increase transparent property. transparent agent increase transparent causes is is transparent agent (Clarifier) is types high nucleating agent. it advantages is in shrink short formed time, maintain products mechanical properties lower to most good optical 效果. transparent agent can solvent understanding in polymer melt in formed uniform solvent liquid, ratio nucleating agent as is types need large several amount grade, cooling rear, transparent agent formed ternary “网格 structure ”. this type of structure as is 晶核, increase formed density. meanwhile,形 formed this type of “网格 structure ” “ fiber ” its large small has nano, full in can light long scope/range inner, therefore, can make products transparent. 据《Molding System》1998 year 报道, USA Dacial polymer company development types is T- 140 transparent ABS new material, it tool has 88 % light transmittance. 4 effect/influence factors due to production transparent ABS products, not only need ensure products dimensions degree, appearance quality and strong/high degree and other, but also need ensure products light property, therefore, transparent ABS and 普通ABS injection molding parts molding injection molding parts mold and process parameters upper has different, tool has features. 4. 1 injection molding parts mold transparent ABS products transparent degree high low and injection molding parts mold design and processing degree related, it effect/influence products surface optical 效果. is to 需形状 high transparency, high gloss products, in injection molding parts mold structure design 方面, gate and dimensions, block large small focus/key point add 以考虑. in ensure cost 允许 情况 lower, can using/adopting hot runner technology, design 时, attention/notes hot and thermal insulation this 2 issues. injection molding parts mold cooling water 道 排布应尽 can can 均衡, ensure products hot 均衡, has products fast speed crystallization. in injection molding parts mold processing in, 一方面 need improve/increase processing degree, 另一方面尽 amount improve/increase injection molding parts mold type surface quality. 首先应 make injection molding parts mold molding separation high degree light slip, molding surface or to 镜面抛 light, molding surface coarse 糙, more 不规则 micro and micro effect/influence light degree, from effect/influence products transparent property. 4. 2 molding process 4. 2. 1 material temperature degree and nozzle temperature degree and 普通ABS 一样, transparent ABS in material in to hot and function 塑化, uniform property main/primary 取决于 temperature degree and hot time, material temperature degree effect/influence to material material temperature degree and flow property. is ensure as stability,塑化 uniform,避免 high temperature lower material in screw inner slip 移, make pressure and injection amount difficult control. meanwhile injection process in high temperature function degradation and additives separation understanding. material temperature low 时, effect/influence products surface gloss degree, material temperature high 于240 ℃ above 时, degree increase, transparent property decline. is make material 筒塑化 transparent ABS high speed nozzle and injection molding parts mold runner to most large flow property and good property, for/regarding melt flow rate relatively high material material, material temperature degree control low 一. for/regarding melt flow rate relatively low material material, material temperature degree control high 一. material temperature degree separation control, from material 斗一端 to nozzle 止, temperature degree rise high,以 make material material 逐步塑化. nozzle temperature degree generally low material front temperature degree, high easy 发生流涎 phenomenon (不应 ultra- 230 ℃), nozzle temperature degree can low, 否则会发生堵塞 or cold material 入模, effect/influence products transparent property. 4. 2. 2 injection molding parts mold temperature degree injection molding parts mold temperature degree high low effect/influence products dimensions, property can, crystallization degree and other process conditions. transparent ABS is crystallization property polymer, rise high mold temperature can improve/increase products density and crystallization degree, has force strong/high degree and products surface light degree improve/increase, products shrinkage rate increase large, products easy deformation. therefore, injection molding parts mold temperature degree 不宜太 high, generally 取40～55 ℃. 但也不 can low,否则会出现 solid 化不完 full, make products generate toward property large,并 has bubbles, and other defect. is improve/increase products surface gloss degree, decrease/reduce non-uniform shrinkage degree, injection molding parts mold surface temperature degree can maintain in 50 ℃ left right. 4. 2. 3 injection pressure and injection speed degree injection pressure and injection speed degree for material material 充模起 决定 function, injection molding parts molding transparent ABS 时, is improve/increase products surface quality, shrink short solid time, from increase large transparent property,应 using/adopting relatively high injection speed degree, add nitrogen gas increase pressure plant/unit more 理想. due to transparent ABS flow property relatively good, crystallization speed degree fast, injection and holding pressure pressure large,以免边缘 generate 雾状,破 bad transparent 效果. 4. 2. 4 molding cycle transparent ABS due to transparent agent, crystallization speed degree fast, solid temperature degree high, formed one-time injection time ratio 普通ABS short, from decrease/reduce molding time, reduce product cost. 5 application injection molding product is transparent ABS medical grade liquid bottle bottle 体（图1）, bottle bottle separation is 椭圆形, bottle separation is 圆形, 颈部平 slip 渡, upper lower 镂空, requirements light transmittance to 80 % above. is ensure light property, using/adopting 图2 injection molding parts mold structure. therefore can ensure light property, main/primary is below/following measures:(1) type and type 芯镀铬, decrease/reduce micro and micro 划痕, improve/increase light transmittance. (2) block thick degree relatively large, injection pressure large 时, generate flash. (3) using/adopting strip/profile, ensure block pressure. (4) injection pressure can can large, improve/increase speed degree, decrease/reduce hot amount loss 失,以不 generate flash is 准. (5) nozzle temperature degree 230 ℃, low transparent agent degradation temperature degree, injection molding parts mold temperature degree is 55 ℃. (6) cooling water 道布置 balanced, water 道直径 relatively large, make products cooling speed degree fast, crystallization fast, transparent property ensure. 6 结束语 through analysis transparent ABS process features, in medical grade liquid bottle bottle 体 实例 in 以实际 application, and ensure light property methods and 建议, from is transparent ABS injection molding parts molding injection molding parts mold design and processing provide 参考.