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polyethylene (PE) pipe/tube extrusion 模头 generally Knowledge
in currently pipe/tube market upper, PE pipe/tube relatively high speed degree positive in upper and ultra- PVC pipe/tube use amount. in production in and in or will project in very has necessary understanding production PE pipe/tube important parts — extrusion 模头. in commonly used types extrusion is 螺旋芯 rod 式模头 and 筛篮式模头. this types separation as discussion, large 家参考.
1, 模头必 must processing material;
2, 模头必 must according to extrusion amount and pipe/tube dimensions design.
一, polyolefin development process
for polyolefin extrusion, from 支架式模头 development to rear commonly used 螺旋式模头 and 筛篮式模头. its 目 都 is can can remove 由模头支架 引起 clamping 线, make 进进模头 material material very good mixed combined, melt more add 均化.
1, 支架式模头
模头 separation 流体部 separation is 支架式, production small pipe/tube is 十字支架式, production large pipe/tube more is strip/profile or strip/profile 筋. this type of most large disadvantages is false front pressure shrink pressure small 话, combined has remove 就不太 good. from must has high pressure make this separation material again melt combined. this requirements tool has versus for high strength structure, therefore overall weight very high. this type of generally more used for PVC pipe/tube extrusion.
2, belt/tape material sheet/plate 支架式模头
most simple methods is will material sheet/plate in 支架之 rear, 由支架 引起 几道 material by separation formed more more small material 流. therefore, machine force from 支架部 separation toward front 推移, clamping large upper by a large amount of small material remove. this type of PE模头 more used for low density polyethylene (PE), small pipe/tube production in. front company in production low density PE排 water use pipe/tube use 模头就 is types 模头. in this category of already 经趋于淘汰, in 一 私营 small also in use.
3, 螺旋芯 rod 式模头 and 筛篮式模头
belt/tape material sheet/plate 支架式模头 in has in high density polyethylene (PE) pipe/tube production in already very less use. more use 螺旋芯 rod 式模头 and 筛篮式模头. this types machine already relatively good solution remove clamping 线 题目. 螺旋芯 rod 式模头 core is 螺旋芯 rod, 筛篮式模头模头 core separation is belt/tape has a large amount of tube/pipe 状体, 即网叠. this types commonly used structure and as principle separation 别说明.
二, 螺旋芯 rod 式模头 structure and as principle
图1 螺旋芯 rod 式模头 structure and as principle
螺旋芯 rod 式模头 also 叫螺旋 separation 流体模头. for/regarding separation 流体模头, 进进模头 melt material 流, through separation system -- has is dry type or other separation system, separation to machine 头四周. rear melt 进进螺旋状 ring in outer runner. runner deep degree 随 靠近模头流出端而逐渐 decrease small. meanwhile, and 模头体 type between 间隙则逐渐 increase large. in this 一区段, material internal 出现轴 toward and toward active heavy 叠. 沿 模头流出 direction, toward active ratio/proportion reduce, toward active ratio/proportion, 则持续进步, full melt toward active 动. using/adopting this type of methods, separation runner active 动印记沿 pipe/tube 断面四周 uniform distribution, this 就意味 不会出现 local strong/high degree loss 失.
沿 pipe/tube 断面四周 melt separation quality multiple factors effect/influence. this factors machine 头 几何 dimensions, runner 数目, runner 缠绕扭曲角 degree, 螺旋 螺距, deep degree and wide degree, wide degree, processing raw materials, especially is its viscosity, and extrusion amount and material material temperature degree. 借助于计算 machine and 操纵者 experience, can for separation 流体进行 optimization design, 以适应特定 application scope. in this type of lower, thick distribution non uniform. this type of remove very good remove combined material outer, also in below/following 几方面 has upper 风:
1, machine force and hot force relatively low, products has good machine strong/high degree.
2, structure solid, combined high viscosity material extrusion, meanwhile 模头 装拆 and 操纵简便.
3, rod upper easy 钻孔, easy using/adopting inner cold system.
above this advantages make 螺旋芯 rod 式模头 to 越 越广泛 application.
this type of disadvantages is: due to its versus for complex structure, this type of type type for raw materials relatively 敏感. make is viscosity and features fine small 变化都会引起螺旋体 in active 动情况 改变, tube/pipe 径 变化也 has versus effect/influence. therefore, need design good 螺旋 几何 outer 形, make tool has can can wide processing scope/range, 以适应 different material and extrusion amount.
三, 筛篮式模头 structure and as principle
in 筛篮式模头 upper, material 流首先 through or belt/tape has more material separation system. melt more 孔区段. this parts, 即筛篮, in this material is toward 流, is toward from toward outer 流. due to tool has long degree, in machine 头直径 relatively small lower, provide very large 流面积. therefore, in versus for relatively small machine dimensions lower, more 孔区段 pressure reduce. in 筛篮区段 inner, melt material 流两次改变流 toward, rear formed toward. mono material between can good mixed combined, melt more add 均化.
借助于一 retardant parts and versus 邻 松弛缓冲区, achieve material between melt combined. due to 筛篮 断面面积 comparison large, 筛篮式 machine machine pressure need obvious low other structure 形式. material material to negative comparison small, material material temperature degree comparison low, can relatively light easy extrusion amount. this type of machine most large advantages is property comparison good make in very high extrusion amount 时, can achieve good 均化; pipe/tube tube/pipe and thick 变化, PE raw materials Model/Grade, material material viscosity, back pressure lower, can production high quality pipe/tube. this type of most large disadvantages is inner has material material melt combined, production in 清理, 拆装模头不如螺旋芯 rod machine good and 方便. company use PE tube/pipe production is 巴登震雄 production, use machine is 筛篮式 machine 头. production in can obvious this type of machine 头 适应 property relatively strong/high, 无论PE80, PE100 also is PE63. 我们另买一 specialized machine extrusion PP-R pipe/tube, solution 经常清理 machine 头 不便.
总之, this types 模头各 has pros and cons, in 选购PE pipe/tube 模头时, long short, according to production selection. production raw materials grade solid 定, production amount relatively large, 不经常 more pipe/tube color 而清理拆装模头时, most good selection 筛篮式模头. requirements pipe/tube thick relatively uniform, production raw materials grade relatively solid 定, more pipe/tube color 而清理拆装模头时, most good selection 螺旋芯 rod 式模头.
