Shanghai Daoqin Plastics Co., Ltd.

how to production 出无熔痕, flow marks, 无流线, shrink 痕, surface high light outer housing/shell product, for/regarding sheet/plate electrical machine, electrical liquid 晶显示 device, 空调, automotive inner trim parts is important. use high light injection molding technology can very good solution issues.

in clamping front and clamping process in for mold add temperature, clamping formed rear, temperature degree to setting conditions 即进行 injection. injection process in mold 继续维持 high temperature, this can make material injection in mold inner maintain very good flow property. injection formed, in holding pressure cooling 时, for mold drop temperature 处理, also can large large shrink short products cooling time, from improve/increase production efficiency.

蒸汽无痕 high light injection molding

technology currently in inner belongs to 一项先进 production process. due to this technology large large improvement products surface quality and surface strong/high degree, can rear spray coating or and other process, 既保护 ring and as 人员 人身健康, also decrease/reduce process process/workflow, 省 昂贵 二次 processing use, in large degree reduce production cost meanwhile, can and material.

传统 做 method is using/adopting mold temperature machine for mold add temperature, this type of methods 不足之处如 lower:

① 无 method meet/satisfy high light injection molding in fast speed rise temperature and fast speed drop temperature need;

② rise temperature degree relatively small, products surface 熔接痕 can to decrease light method remove;

③ due to plastics hardness high, flow property 越差. therefore using/adopting types process products surface hardness can to HB grade method meet/satisfy use need;

④ mold rise temperature hot 膨胀, drop temperature also shrinkage, make clamping force very unstable. easy formed products 打不满, 烧焦, internal stress large and other various defect.

in process upper development 而 蒸汽 high light injection molding technology for above defect separation 别做 改进:

① 此 technology in mold in water tube/pipe, need rise temperature 时通蒸汽, need drop temperature cold water, cooling rear use pressure shrink gas will water separation 吹出, ensure can achieve fast speed rise temperature, drop temperature;

② 以 most large degree remove 熔接痕夹, water short shot and other various products fault/failure;

③ due to rise temperature degree relatively large, use H甚至2H hardness grade plastics, make products surface hardness large large improve/increase;

④ due to in mold internal pipeline 时, for mold inner surface rise temperature or drop temperature, mold overall relatively small, therefore decrease/reduce due to clamping force unstable belt/tape various products defect.

need production high quality high light products, need injection molding machine, mold, temperature equipment, high light products specialized plastics, and 锅炉, cooling plant/unit and other versus combined.

塑 machine 配置

①锁模 machine rigid property need good; due to production process in need rise temperature and drop temperature. therefore requirements injection molding machine machine must rigid property, strong/high degree need good, ensure clamping force and stability. from ensure products surface quality.

② selection large injection molding machine: use process due to method again use gas 体辅助 injection, therefore production products need clamping force comparison large.

③ according to selection relatively small amount: production sheet/plate electrical machine, liquid 晶显示屏 outer frame and other product 时, need relatively large amount, in selection injection molding machine amount selection small amount injection molding machine. products weight in injection molding mechanism 论射胶 amount 30%～80% between most 佳. machine amount large, material in material inner time long easy separation separation understanding, products surface generate silver streaks and other defect.

④ 配备 specialized screw production high light products use to plastics hardness relatively high, its melt flow index versus for relatively low, 因 此 requirements screw need good. meanwhile screw also can large, 否则胶 material easy separation understanding.

mold 配置

① mold inner surface requirements non high light degree, ensure products surface quality;

② mold internal pipeline must combined 理, ensure can fast speed rise temperature and drop temperature;

③ mold internal pipeline 应该导 thermal properties good;

④ due to production process in need add temperature and drop temperature, mold selection need good;

⑤ in use process in need especially heavy mold maintenance, ensure drying, 无尘

temperature equipment 配置

① temperature degree control need non 常准确, this is products quality important ensure;

② temperature equipment reaction need non fast ensure relatively high production efficiency.

specialized plastics

production surface quality relatively high product 时, commonly used plastics has ABS, PC+ABS or PMMA+ABS. its in, ABS hardness most low, PMMA+ABS hardness most high, can 达H, 甚至2H. hardness high, melt flow index versus for low. flow property 会变差, therefore can according to production need 选取适当 plastics.

随 plastics parts application day 趋广泛, and for/regarding environmental protection, safety 意识逐渐 increase high, 蒸汽无痕 high light injection molding already formed is future injection molding field/area front and technology.