Shanghai Daoqin Plastics Co., Ltd.

         generate black spots reduce formed product rate, easy solution, is injection molding industry 一 共同话题. will 以TPU材 material machine sleeve/set injection molding is 例, brief discussion TPU injection molding black spots and solution methods.

         thermoplastic polyurethane (TPU) generally by as TPU(Thermoplastic polyurethanes), TPU tool has its it plastics material method ratio many excellent function, its excellent property can and environmental protection concept day to 人们 欢迎. TPU already widely used in electronics electrical appliances, medical 卫生, industrial and and other 方面, used for made as machine sleeve/set, medical device 材, device 材, footwear materials, toys, automotive base/seat material and other day commonly used product. has data forecast, 2013-2017 year TPU market year growth speed degree 达11.2%, 2017 year 消费额 expected will to 28.1 100 million yuan.

        TPU因 its low viscosity, good resistant property, excellent wear resistance, high gloss degree features, year already formed is injection molding production machine sleeve/set main/primary material, in production in TPU injection molding product black spots phenomenon 并不罕见.

         generate black spots reduce formed product rate, easy solution, is injection molding industry 一 共同话题. will 以TPU材 material machine sleeve/set injection molding is 例, brief discussion TPU injection molding black spots and solution methods.

         from polymer/macromolecule molding process understanding 释出现 black spots material causes, is due to TPU含 has 氨基, active property strong/high, in melt lower tool has viscous property, injection molding process in, and screw, material 筒接触 that 层TPU raw materials long time 滞留无 method by injection shot material outer, 经 一段 time hot aging, by separation understanding, in screw, material upper 出现积 carbon, injection molding process in carbon by scratch 脱落, mixed melt raw materials in injection molding, product black spots.

         in production in, add fast 导致TPU raw materials injection molding generate black spots causes has very more, main/primary has below/following this:

          workshop production ring relatively 差

         workshop ring 境脏乱, powder and 杂质污染 整 production process/workflow step/link.

        TPU raw materials pure 净

         is reduce cost, has production in raw materials in more “ water 口” material use, or different raw materials 牌子杂乱 mixed use, raw materials low 档.

          injection molding machine 操 as specification

         this separation more 方面, its is mold factors, mold molding product 形状, thick degree and other design defect. in machine sleeve/set 越 越 large and thin, also has production 1出2 or more more mold, production mono improve/increase raw materials temperature degree filling mold cavity, time long product and generate black spots; its 二客户 selection injection molding machine comparison low 端, or machine selection 不当, machine can force can meet/satisfy molding conditions pressure, speed and other parameters setting.

            and machine use process debugging water has 关

        调 machine 师傅一直 use most usually methods debugging machine.

          use defect good as 习惯

        譬如暂停 production front, has good material tube/pipe raw materials injection machine to temperature 状态, raw materials long hot, 导致发黄.

          injection molding machine less maintenance

         generally production TPU raw materials injection molding machine most good one-time one-time screw and material 筒 清洁 maintenance, machine cost high, ratio machine formed black spots 而浪费 material use low, is has 厂商忽略 this 一点.

         also has its it causes products black spots, this 情况出现 usually more 项交错. in low product production 厂商因节约 cost this comparison Common. high product production 厂商因 is product profit relatively high this versus for relatively less, 他们会严格 tube/pipe as specification, more for injection molding machine maintenance, use plastics versus for relatively good.

         raw materials use is generate black spots causes. TPU本身 resistant temperature property good, raw materials property 质差异 effect/influence relatively is important. 一 产自 Europe (如 Germany Bayer) and Taiwan raw materials generally ratio inner production good, has add temperature 至240℃-250℃也不会“糊 material ”, inner production has raw materials add temperature ultra- 230℃, time long 就出现发黄 and black spots issues.

         but also, production 厂商因接 to different color product mono, frequency more 换渗入 raw materials in color powder, for production excellent injection molding parts 也提出 very large 考验. processing application in summary experience: more color powder from shallow color to deep color 次序, production transparent, shallow color product, again to deep color, most rear black, its rear 清洗一遍 machine again transparent color products. this type of in rear more products color production in 会浪费 a large amount of raw materials. meanwhile need color powder resistant temperature property, poor color powder is black spots is black spots 元凶.

         in production ring 境, raw materials quality, mold and other factors method 改变 情况 lower, Yizumi for injection molding machine design and use process, has 专门 应 for methods solution 客户面 for type issues.

        一, according to product need, adjustment injection molding machine hard parts parameters. decrease/reduce raw materials in material and screw inner time, control high production temperature degree, from decrease/reduce raw materials in machine inner carbon 化. add large injection plant/unit injection pressure and injection speed rate, more easy molding. specific methods lower:

        1, for machine most simple methods is sleeve/set material tube/pipe 组, decrease small screw 直径, make raw materials in material in time short, standards UN120SK product 直径38cm screw is 直径35cm screw, meanwhile injection pressure improves 17%, more improvement molding thin product, this type of especially engineering cost versus large.

        2, types methods is improve/increase injection molding machine speed degree (add large electrical machine)而 mold cavity filling 满, use improves raw materials temperature degree. this type of 特工改装 methods 会一定程 degree improve/increase machine cost.

         also has is less machine injection amount. production machine sleeve/set injection amount generally relatively less, less injection amount make raw materials in material inner time decrease/reduce, shrink small grade 射台, need cost.

        二, use parameters design production TPU raw materials specialized screw, specialized design screw more combined production TPU材 material.

            三, combined use machine, made as specification.

         Yizumi for production 情况结 combined injection molding machine property can, made 《TPU specialized machine as specification 指导书》 and 《TPU material tube/pipe 组清洗 as 业指导书》. 《指导书》 upper 不建议客户 improve/increase temperature degree production, 并建议客户定期 for injection molding machine machine, machine, raw materials long time add temperature carbon separation understanding; for machine specification steps.

         Yizumi through ring methods solution issues, in selection injection molding machine front understanding 清楚客户 production what products, use what raw materials, rear design according to demand selection 一款各方面 parameters most combined conditions injection molding machine, ensure injection molding machine parts quality, also for 客户状况如 production process, mold, as methods and other 方面提出 overall solutions. 确, property can parameters excellent screw for production property has relatively large improvement, meanwhile, 我们认 is heavy process and as specification is non important front 提, products black spots is full can can.

         currently TPU production black spots issues has 一劳永逸 solution methods, again good machine need combined application methods. 建议客户 in injection molding machine front and processing production front inquiry related 专业人员, 避免人 is type and as belt/tape loss 失, make tube/pipe more add specification, production more add 顺畅, formed is more add TPU production sleeve/set 商.