Shanghai Daoqin Plastics Co., Ltd.

      polyethylene (PE) recycled material can crosslinked modified, improve/increase its tensile strength and modulus, and heat resistant property, weather resistance, wear resistance and dimensional stability and other. crosslinked degree different, its force modified degree different, polyethylene (PE) recycled material in separation crosslinked rear formed structure, from thermoplastic property plastics is hot solid property plastics, force property can large large improvement, for/regarding recycling polyethylene (PE) recycled material 说, make light degree crosslinked, can maintain its thermoplastic property can meanwhile also improve/increase its force property can, but also recycling polyethylene (PE) recycled material products again waste rear also can recycled utilizing.  
  
    polyethylene (PE) recycled material crosslinked modified has chemical crosslinked and crosslinked types, polyethylene (PE) recycled material main/primary using/adopting chemical crosslinked method. chemical crosslinked use crosslinked agent is has machine oxidation material (如 oxidation 二异丙苯) and other.   
  
    as steps is: use extrusion tIL will oxidation 二异丙苯 and powder rear polyethylene (PE) recycled material waste material mixed combined, in high temperature lower crosslinked, temperature degree control in 170--180 degree, to material is light degree crosslinked modified polyethylene (PE) recycled material, use this type of material processing formed products not only force property can has improve/increase, but also still maintain thermoplastic processing features. use extrusion machine screw long ratio 以35 is 宜.   
  
    crosslinked modified polyethylene (PE) recycled material has types processing molding methods:   
  
    1, in polyethylene (PE) recycled material soft 化点之 upper make separation 塑化, meanwhile mixed crosslinked agent, in crosslinked agent separation understanding temperature degree lower pelletizing, in pressure process in make crosslinked reaction and molding 一步完 formed.  
  
    2, in crosslinked agent separation understanding temperature degree below/following made formed type, again add hot to generate crosslinked reaction temperature degree upper formed solid 化, method is method.
塑编 products raw materials main/primary is polypropylene (PP) and high density polyethylene (PE), its raw materials generally has modifier, lubricant, masterbatch and other. according to products applications different, for raw materials selection has different. generally 说, use high density polyethylene (PE) weaving 筒布手感, soft/flexible property, low temperature resistance property relatively good. polypropylene (PP) 源丰富, price low 廉, 故塑编 products using/adopting polypropylene (PP) as is main/primary raw materials.  

       plastics products molding is extrusion molding. is ensure filament type processing parts quality, generally selection melt flow rate （MFR）恰当 raw materials. usually used for polypropylene (PP) melt flow rate in 2～5g/10min between. melt flow index small, filament strong/high degree high, molding difficult; 反之, filament strong/high degree low, molding relatively easy. in formulation in add a large amount of filling modifier, reduce material material in molding process upper flow property, can add a small amount of increase agent or lubricant improve/increase its flow property.  

       currently, polypropylene (PP) recycled plastics raw materials 也应 used for products production, although its material features and quality ratio new material 差, need combined selection, can to standards. use recycled material production filament light 亮, can in raw materials formulation in add a small amount of lubricant improvement.  

       for/regarding polypropylene (PP) recycled material selection, need “一看二咬三燃四牵”, recycled material outer table/sheet, surface wax 感, 黑亮无 bubbles is relatively good recycled material; poly pellets in upper light 咬, relatively hard is polypropylene (PP) recycled material pellets, 咬不断 is relatively good PP recycled material pellets, relatively soft is PE type recycled material pellets; pellets in upper 点燃, 离开火焰 rear can 够自行燃烧, color 底部蓝 color, 顶部黄 color, in process in has a large amount of 黑烟, melt 滴落, dispersion 发出石油 odor PP recycled material; in melt lower can 够连续不断 牵出 fine filament PP recycled material, filament short, dispersion wax odor polyethylene (PE) recycled material pellets.  

        rear melt material material through rear 应立即进行 cooling, cooling methods temperature is water cold. cooling temperature degree control in 30～35℃ is 宜. for material material cooling has 三 目: is make melt type; is high temperature oxidation; is retardant material material crystallization, is hot tensile provide necessary conditions.  

       extrusion film cooling rear, according to filament type type different selection combined 适 刀距进行切割. in 切割时, amount unchanged film uniform property. rear film need hot tensile 处理才 can to tool has relatively large force filament, is is anti filament in rear weaving process in generate relatively large shrinkage, also for its hot type 处理.  

       film in hot tensile and hot type 处理时 need according to material material and filament different selection combined temperature degree and ratio. usually, new material hot tensile and hot type temperature degree separation in 120℃ and 100℃ left right, ratio in 1: 5.8 left right; recycled material hot tensile and hot type temperature degree separation in 100℃ and 90℃ left right, ratio in 1:5 left right.
 
       another, filament type type and heavy ratio different, its hot tensile, hot type temperature degree and ratio same, heavy comparison large filament, its temperature degree and ratio can large 一; 反之, temperature degree and ratio need small 一 （ according to 平时掌握 experience and mechanical properties 而定）.  

       film hot tensile and hot type rear can used for machine weaving.