Shanghai Daoqin Plastics Co., Ltd.

polypropylene (PP) （PP） material temperature degree material 区30～50℃（50℃） 区1160～250℃（200℃） 区2200～300℃（220℃） 区3220～300℃（240℃） 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 20～70℃ 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 products generate shrink 壁, need very long time for products holding pressure （约 is ring time 30％）; is injection pressure 30％～60％ back pressure 5～20MPa（50～200bar） injection speed degree for thin plastics bottle packaging container need high injection speed degree （ belt/tape can device ）; 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 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 speed dry need; if conditions good, in 80℃ temperature degree lower dry 1h就 can recycling rate can to 100％ recycling shrinkage rate 1.2～2.5％; shrinkage degree high; 24h rear again shrinkage （ molding rear shrinkage ） gate system gate or more gate; add hot hot runner, temperature hot runner, inner sleeve/set; gate in products most thick 点, easy large sink marks machine 停工时段无需 use its it material 进行专门 清洗工 as; PP 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