Shanghai Daoqin Plastics Co., Ltd.

can currently world, products year demand already 达十几 10,000 tons,国 inner make raw materials speed to melt temperature degree, screw make melt. demand 数千吨 products in market non large. for separation mixed combined process upper comparison easy control toward screw products development and 推广不够,般都 tool has,够 high,转矩 screw, speed degree generally ultra- 二 is type copolymer poly polyether its soft is long table/sheet,. different screw its speed 确定见元 alcohol ester or,,一组 formed hard is 由二异氰 acid and table/sheet different screw and speed ester usually is 二苯烷二异氰 acid ester.,刀 short alcohol butanediol formed 就嵌段 copolymer,说 soft screw 直径浏・一’团段 usually can effect/influence polymer low temperature property can and elastic property hard 链段通. most large speed 而卯常 effect/influence poly, combined material soft melt temperature degree and high temperature property can generally raw materials drying 处理 说 in, hard 链段氨基甲 acid ester, and other mono between formed production products advantages is 购 材 material can hydrogen is material property crosslinked main/primary is tool has good material use 无需添 add additives,而直接 processing. in processing front property can lower this type of material,素之理 crosslinked in processing add hot and force as to can property bad.,熔必 must drying 处理.

本人经 more 次实验,,证明 is melt can injection formed various 形状. cooling rear hydrogen formed also make raw materials in water separation 挥发掉 processing front,粒 material generally in formed material property crosslinked 皿兀 组 formed structure and generate hard.,鼓风 drying 烘箱, in drying 以约并 need 经. degree is process upper control temperature degree important factors 动不宜堆积太 thick dry effect/influence drying 效果间 also use if equipment and raw materials requirements material water separation content large use used for need long make amount 取现适. processing most more 允许含 has separation equipment brief introduction generally used for processing thermoplastic property plastics injection molding machine can use water separation usually 以四粒 material absorption water separation quality separation 数,约 in or upper material drying full production 出.

polyurethane ester products 呈豆渣状 cracking in wet degree large,若因 fault/failure 模,化定 time relatively pressure pressure 称. make as 暂停仅一两 small 时密封 property good material 斗, pressure pressure holding pressure pressure effect/influence products dimensional stability usually already drying. material 也会吸潮继续 production front through, experiment/testing 以确定 products shrinkage. rate scope/range most small pressure,必 must heavy new dry value value as is holding pressure pressure, if holding pressure pressure large. processing parameters formed difficult demolding, make molding cycle long 笔者认. is injection processing temperature degree setting pressure is holding pressure pressure 以, is processing temperature degree setting 取决于 equipment type type and specifications hard and 源因即一厂, important in molding cycle in injection time generally is, injection time and holding pressure time very mold, material degree, and other,素 make is provide,处 熔 material 凝结之 rear material hardness products large batch different its property can can can 差异颇 large small, thick thin degree, mold temperature degree and other parameters setting holding pressure time. is different batch versus raw materials combined formed process in molecular weight distribution formed can can has and other and other holding pressure 时,间 long short ensure products demolding 时不引. deformation is hardness can can has different tensile strength and melt temperature degree.,原则 holding pressure time generally above melt temperature degree has can melt temperature degree lower type hardness melt temperature degree different hardness 土 熔,致并 mold design key points processing mold design and usually plastics processing mold large is can requirements has 足够 锥 degree runner need ratio add this need as tool has processing experience products appearance and adjustment temperature temperature degree temperature,. degree plastics processing use mold large can can large 否则因. demolding and products 接触面 solid slow easy make products in made 不当会 make products obvious defect temperature degree high 会,出时 deformation 顶杆截面积 large for mold gas has 益处, make products generate shrinkage. temperature degree low 出现熔 melt defect, mold conditions cooling need large make mold has good cooling products non-uniform in basic upper can melt front lower,笔, and toward processing temperature degree 稍稍偏 low is products has less,工 products shrinkage rate and products 形状预材 material type type product amount melt full generate filament strip/profile 纹时,, products add conditions has 关先精确确定 certain parts made,,各部位 dimensions comparison stability for appearance effect/influence large. and 时稍调 shrinkage rate is separation difficult 往往需 mold trial. 修改数次之 high 一℃即 can 继续生,产 has filament strip/profile,纹 product rear can product to dimensions requirements right. generally simple rear 处理工序 rear material property testing. table/sheet material machine, made shrinkage rate is left property can has reduce products 就而若 processing temperature degree high already formed waste product generate shrink formed product rear 处理, appearance. 言, formed drop demolding rear products in 鼓风烘箱 in ℃处理 low cost increase 经实践土 in temperature screw injection molding, machine 巧一,以尽 fast remove internal stress. 经 如此处理, made upper processing distribution 见图. its temperature degree degree product tensile strength can improve/increase products in use front in above waste material recycling use high 于. if rear 处℃ temperature degree ring in injection molding machine runner, inner material and parts waste product 圈姆杆沮 degree degree distribution can heavy new powder 碎我们称之 is use material product material control injection molding pressure and time and new material mixed combined make, made property can large degree drop due to melt viscosity relatively low, processing 时 需 relatively small low generally can in. new material in add injection pressure can make its through runner mold cavity,充满杂质 relatively high material usually for 不提倡掺旧 products mechanical properties requirements material products can will material polyurethane ester industrial property material in high toughness in 抛砖引玉引起 injection molding processing 业 and polyurethane ester elastomer and elastic property.