Shanghai Daoqin Plastics Co., Ltd.

1 this 里 讨论 is woven bag recycled utilizing, waste material is combined production woven bag PP plastics waste product. this is types mono product types waste material utilizing, requirements comparison high, can mixed has its it product types plastics, more can has 泥沙, material, machine 械杂质 and other, its melt flow index requirements in 2--5 scope/range inner （不 is 任何pp plastics can use ）. it main/primary has 两, is woven bag production process in waste material; is waste 弃pp bag recycling product, 如化肥 bag, material bag, salt bag and other and other. 　　2 recycled methods 　　 it main/primary has melt method and extrusion pelletizing method types, more using/adopting extrusion pelletizing method. types methods process/workflow lower. 　　2.1熔 melt method 　　 waste material --选 material water 洗--晾 dry --裁 strip/profile -- high speed 团粒（投 material -- hot shrinkage --喷 water --团粒）出 material packaging. 　　2.2 extrusion pelletizing method 　　 waste material --选 material -- water 洗--晾 dry --裁 strip/profile -- add hot extrusion --- cooling pellet cutting -- packaging. 　　 extrusion method use equipment is 自造 二 grade extrusion machine, is troubleshooting waste material extrusion in generate gas 体, can use gas extrusion machine. is troubleshooting waste material in material, in extrusion machine material must 80-120目 筛网. 　　3. recycled material utilizing and for pp bag property can effect/influence due to plastics processing hot aging for property can has effect/influence, especially is recycling woven bag 经 两次甚至 more hot process, meanwhile add upper recycling front in use in outer aging, property can has obvious decline. 　　4. recycled material utilizing for wire drawing process adjustment due to pp plastics more hot processing generate hot aging and long use in outer 线照射 aging, make pp recycling material melt flow index processing 次数不断 increase upper rise. therefore, in new material in a large amount of add recycling material rear, in process temperature degree control upper, versus for full new material, for extrusion machine temperature degree, machine temperature degree, tensile type temperature degree as 适当调 low, adjustment amount through testing new mixed combined material melt flow index 确定. 　　另一方面, due to recycling material more processing, molecular weight reduce, has a large amount of short separation 子链存 in, but also more tensile orientation. therefore, in production process in, tensile 倍数也 need relatively types full new material low. generally full new material tensile is 4--5倍, add 入40% recycling material rear generally is 3--4倍. due to recycling material melt flow index improve/increase, viscosity has reduce, extrusion speed rate has improve/increase, in same screw speed and temperature degree conditions lower, wire drawing speed degree need micro add fast. in new raw materials mixed in, value attention/notes is need mixed combined uniform; meanwhile amount selection melt flow index versus raw materials combined. melt flow index versus large, melt temperature degree versus large. in extrusion in, types raw materials can meanwhile 塑化, heavy effect/influence extrusion tensile speed degree, formed waste product rate high, 甚至无 method production.