Shanghai Daoqin Plastics Co., Ltd.

reaction injection molding (RIM) through mixed combined, will reaction property liquid in 间体进入 mold will its mixed combined, from make parts molding. and injection molding different is, reaction injection molding through in mold inner achieve crosslinked or polymerization 化而形 formed solid parts, is through cooling methods. this process need using/adopting hot mold cavity active reaction. upper, in in hot amount lower mixed combined 时会形 formed hot amount, therefore, RIM mold usually need cooling. molding parts demolding time generally ultra- 20秒钟.
　　　　　　　
reaction injection molding process development polyurethane ester foam technology. automotive market demand 推动, make this process in USA obtain large growth, automotive market still is reaction injection molding main/primary use 武之. this technology 进步 自 automotive production use material and process 改进. 不, reaction injection molding in medical device industry has relatively large applications, structure foam machine parts, base/seat, structure parts, can again use type foam 病人定位 parts and other.
　　　　　　　
reaction injection molding advantages 　
generally 说, using/adopting reaction injection molding, can make structure parts weight more light, automotive 保险杠以 and its it anti product or decrease product in use type strong/high force elastic property plastics. using/adopting this process, can reduce repair use, 保险费 use and material use, from make large degree 节省总体费 use.
　　　　　　　
该 process belt/tape 社会效益 is reduce gas 污染. USA 国家科学基金会(NSF)一直支持 reaction injection molding research. 20世纪80 year 代, NSF支持 research development soft parts obtain formed 功. Union Carbide, DOD and NASA也 provide 支持. 　
　　　　　
reaction injection molding requirements
　　　　　　　
equipment 　
reaction injection molding equipment most Germany made, more 家厂商 sales. reaction injection molding system basic parts 包括: 状态调理 system, use 於准备 liquid in 间体; amount system, ensure 以规定 数 amount and pressure in 间体; or more mixed combined machine 头, through mixed combined methods mixed combined liquid in 间体; 载模架, make mold requirements orientation, mold opening and clamping, 便於清洁 and demolding.
　　　　　　　
and thermoplastic property plastics injection molding different is, reaction injection molding in process in using/adopting low viscosity liquid 体, through internal generate pressure, can made formed parts. therefore, reaction injection molding using/adopting injection molding pressure can low 至50psi(thermoplastic property plastics injection molding pressure low 於5000psi), from make clamping force has small type machine can amount production relatively large parts. 基於同一 causes, RIM mold ratio thermoplastic property plastics process cost low more. is, using/adopting injection molding standards made formed RIM mold formed rate high. RIM mold in filling low viscosity liquid 体方面 has requirements, using/adopting its it process mold difficult 以适应.
　　　　　　　
reaction injection molding tool has viscosity low, mold pressure low, mold cost low and other features, especially combined short process/workflow production and machine production. need reaction injection molding to formed application, made 宜进行 equipment type separation key/critical. equipment selection based on main/primary parameters 包括: use material type type (如 foam, elastomer and other), production parts dimensions combined property and 需 产出 rate. 随? technology development, equipment already to versus 应 改进. market has more selection solution/scheme, its in is using/adopting more mixed combined and equipment formed system solution multiple processing property issues. equipment 而言, has multiple selection solution/scheme, various mixed combined type type and dimensions, material and mold temperature degree control, can 编程式 injection time control and process/workflow control and other.
　　　　　　　
材 material 　
rate using/adopting reaction injection molding material is polyurethane ester. is, technology 进步, many its it material in can using/adopting reaction injection molding process. reaction injection molding can use production flexible foam, rigid property foam and elastomer, specific according to using/adopting in 间体而定. 例如, injection molding process already use production its it process method processing can again use type foam. reaction injection molding process tool has relatively high active property, can solution using/adopting plastics, 橡胶甚至钢材 and other its it material method solution issues.
　　　　　　　
processing parameters 　　　　　　　
reaction injection molding in using/adopting low viscosity in is improve/increase production efficiency large advantages, is, this process has its 不足之处. this reaction property or property Raw Materials need using/adopting specialty equipment and 程序, 包括溢出清理材 material. as 员应穿戴 anti clothing/apparel and 眼罩, has 时甚至 need 佩戴空 gas 滤面罩. has material easy in room temperature 冻结, therefore, and 存放应 in temperature ring lower 进行.
　　　　　　　
该 process in filling easy bubbles inner 藏, mold difficult 於密封, make material more add heavy. this issues generally can through fine material selection, design mold and orientation, injection time and gas and other solution. low viscosity material easy mold, therefore difficult development combined reaction injection molding demolding agent. but also, most 近颁布 prohibited use certain foaming agent (包括 chlorine fluorine carbon and hydrogen fluorine carbon) strip/profile 例, therefore, must 进行广泛 research 以寻求 combined 适 代 use product.
　　　　　　　
injection molding must through long use reaction injection molding process, 以掌握 chemical 操控, mold manufacturing and processing parameters and other features can formed 功. this features in different project in same, make provide reaction injection molding product company 需经历 relatively long process.
　　　　　　　
design in 应考虑 factors 　
can using/adopting has parts and reinforcement material. reinforcement material glass fiber, waste plastics, metal or material. can add filling agent, 以改进 formed product modulus or reduce processing shrinkage rate.