Shanghai Daoqin Plastics Co., Ltd.

temperature degree for PVC-U plastics pipe/tube effect/influence in PVC-U plastics pipe/tube 整 生命 cycle in, from production processing, product to use, temperature degree different 直接决定 pipe/tube use lifespan and use strong/high degree. lower from plastics temperature degree effect/influence principle temperature degree for plastics pipe/tube effect/influence. 　　　　 plastics products is polymer/macromolecule polymer, temperature degree different 会呈现出玻璃态, high elastic and viscous 流态三 types 状态（ this types is different low separation material 质, low separation material 质三态 is solid, liquid, gas separation 明）, due to polymer/macromolecule material molecular weight distribution and dispersion, therefore between versus 互转化时不 is non 常明确 temperature degree value, is comparison wide temperature degree scope/range （ low separation material 质三态转化 has comparison melting point, 沸点）. 玻璃态 lower plastics tool has strong/high degree, in normal temperature lower more plastics 处于玻璃态, usually is in this temperature degree lower application various plastics; high elastic lower, high poly material separation can versus for easy 伸展, plastics tool has very good elastic property, can 进行一 simple rear formed processing （如 expand 口, bending ）; in viscous 流态时, high poly material separation tool has versus for good flow property, can complex processing 如: extrusion, injection molding parts and other and other. 　　　　 in PVC-U pipe/tube extrusion production in, due to temperature degree different, material material 三态 变化 is: in extrusion machine in, material material in screw 末端（计 amount 段）应达 to viscous 流态, in machine in viscous 流态; 离开口模 rear high elastic 态, 接触定径 sleeve/set rear, in table/sheet speed drop temperature, temperature degree drop 至玻璃化 temperature degree below/following, cooling separation performance 出玻璃态, maintain 一定 形状, rear cooling, pipe/tube overall 呈玻璃态; expand 口工序, for pipe/tube add hot, make expand separation high elastic 态, utilizing it elastic property can make injection molding parts mold light 松进入, and pipe/tube loss 伤, rear add pressure cooling 至玻璃态定 type. 　　　　 in production process in, has temperature is 直接测 amount material material temperature degree, therefore temperature is material material true temperature degree, its it 工序 各 temperature degree is through equipment temperature degree 间接 反映 material material temperature degree （ extrusion machine machine 身, machine 头, add hot 炉）, temperature degree value and material material temperature degree in 一定 偏差. 　　　 1, mixed material 　　　　 mixed material process separation is hot mixed and cold mixed, hot mixed main/primary is make formulation in separation separation material mixed combined, make its dispersion uniform, 并排出 its in water gas. hot mixed temperature degree generally in 110摄氏 degree above, hot amount is high speed mixed combined machine high speed belt/tape material material high speed 运动, material material and and 搅拌桨摩 scratch hot, material material between scratch hot, make temperature degree upper rise. this process temperature degree main/primary 考虑不 need use resin separation understanding, water separation separation gas 化挥发, lubricant type material can 够熔化并 dispersion uniform. hot mixed rear, will material material cold mixed machine in drop temperature, temperature degree drop to 40摄氏 degree left right will material material 排出, if has this cooling process, hot material material in 一起, hot amount dispersion 发不出, formed material material hot separation understanding. 　　 2, extrusion 　　　　 extrusion process in and to temperature degree main/primary has machine and machine 头, in machine and machine 头部位, main/primary is hot, specific hot amount is, machine 身部位 摩 scratch hot and outer add hot, machine 头部位 outer add hot. in extrusion process in, hot process and temperature degree high low and hot time has very large 关系. 　　　　 machine main/primary screw and machine 筒. screw usually separation is 三段, add material 段, 塑化段 and amount 段. 　　　　 add material 段: in material 口位置, anti material material 架桥通 has cooling water; according to solid 体输送理论, is achieve large extrusion amount, requirements screw has relatively large can force, screw temperature degree high, in equipment more has screw temperature degree control, screw can different between hot and scratch hot adjustment temperature degree; make machine temperature degree high, is machine temperature degree, is material material temperature degree. 　 塑化段: through absorption various hot amount material material temperature degree upper rise, temperature degree to lubricant melting point above, lubricant rear has viscous function, material material formed types non hydrophobic block material, in material material true 空抽吸孔时, negative pressure its in water separation, volatile content, if temperature degree high （确切 应当 is hot amount more ）, material material will formed types block material, water separation, volatile content will by in block material internal, can negative pressure 脱出. temperature degree low （确切 说应当 is hot amount 不足）, its in water separation, volatile content can separation gas 化排出, powder material material will from true by 吸出, 堵塞抽 true pipeline. 　　　　 amount 段: material material will pressure 实, 并建立 pressure, 以克服 machine retardant force, scratch hot will formed is main/primary hot amount 源, in stage/phase material material already need a large amount of hot, material material need toward outer dispersion hot. machine can outer machine dispersion hot, therefore machine dispersion hot is most simple has 效; screw dispersion hot issues easy solution, is is temperature outer ring dispersion hot also is utilizing hot tube/pipe technology inner cold dispersion hot, screw internal dispersion hot small, made its dispersion hot 功效, especially in high speed production 时, scratch hot large, generate hot amount dispersion 不出, formed material temperature high, effect/influence pipe/tube inner formed and physical properties. 　　　　 temperature is non important process parameters, temperature in extrusion machine and machine 头 连接体处测 amount, temperature extrusion machine in amount temperature degree effect/influence non large, usually through adjustment amount temperature degree control temperature. amount temperature hot electrical 偶直接 and material material 接触, therefore, temperature is material material temperature degree. 　　　　 machine main/primary is make material material more add uniform, make material material pressure more add 密实, make material material 由不规则 flow formed 规则 直线 flow, formed products 形状. machine main/primary separation is and machine 头体, due to material material in machine 头 停留 time relatively long, therefore temperature degree high. machine temperature degree, pressure, long degree effect/influence combined material 线 情况 and product property can. in extrusion process in, due to extrusion machine different, 当转数 high 时, in machine 筒部位 摩 scratch hot amount high, due to extrusion speed degree fast, material material in machine in time short, machine temperature degree can 适当 设 high 一点; 当转数 comparison low 时, material material in machine in time long, machine temperature degree ratio high low 一点.