Shanghai Daoqin Plastics Co., Ltd.

high density polyethylene (PE) （HDPE） material temperature degree material 区30～50℃（50℃） 区1160～250℃（200℃） 区2200～300℃（210℃） 区3220～300℃（230℃） 区4220～300℃（240℃） 区5220～300℃（240℃） nozzle 220～300℃（240℃） 括号 inner temperature degree as is basic setting value, utilizing rate is 35％ and 65％, parts long and thick ratio is 50: 1 to 100: 1 熔 material temperature degree 220～280℃ material temperature 220℃ mold temperature degree 20～60℃ injection pressure tool has very good flow property can, using/adopting high injection pressure 80～140MPa（800～1400bar）; thin packaging container remove outer can to 180MPa(1800bar) holding pressure pressure shrinkage degree relatively high, need long time for products holding pressure, dimensions degree is key/critical factors, is injection pressure 30％～60％ back pressure 5～20MPa（50～200bar）; back pressure low easy formed products weight and color dispersion injection speed degree for thin plastics bottle packaging container need high injection speed degree, in and other injection speed degree comparison suitable for its it type plastics products screw speed high screw speed （线 speed degree is 1.3m/s） is 允许, need meet/satisfy cooling time front formed process can; screw requirements is low amount 行程0.5～4D（ most small value ～ most large value ）; 4D amount is material provide long time is very important material amount 2～8mm, 取决于计 amount and screw recycling rate can to 100％ recycling shrinkage rate 1.2～2.5％; easy 扭曲; shrinkage degree high; 24h rear again shrinkage （ molding rear shrinkage ） gate system gate; add hot hot runner, temperature hot runner, inner sleeve/set; 横截面面积 versus for small, for thin products already machine 停工时段无需 use its it material 进行专门 清洗工 as; PE resistant temperature rise material equipment standards screw, standards use 三段式 screw; for plastics bottle packaging container type products, mixed combined and 切变段几何 outer 形特殊（L: D＝25: 1）, nozzle, 止逆阀