湖南pph管的擠出成型工藝
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pph管的擠壓成形加(jia)工工藝以下:
1、原材料的挑選:阻燃塑料聚丙稀管件用(yong)環氧(yang)樹脂,其溶(rong)體流動性速度在0.2~0.4g/10min范(fan)疇(chou)內。一般(ban)溶(rong)體流動性速度在0.2~0.4g/10min范(fan)疇(chou)內的環氧(yang)樹脂運用(yong)較多。
2、聚丙烯(xi)管生(sheng)產(chan)工(gong)藝(yi)流程次序:與通用(yong)性聚乙烯(xi)給水管的(de)生(sheng)產(chan)工(gong)藝(yi)流程次序同樣,加工(gong)工(gong)藝(yi)次序以下。原材(cai)(cai)料(liao)(liao)開袋查驗品質(zhi)→擠塑機把(ba)原材(cai)(cai)料(liao)(liao)熔(rong)融熔(rong)化(hua)→模(mo)貝成形(xing)管料(liao)(liao)→真(zhen)空泵(beng)口(kou)模(mo)套(tao)制冷(leng)口(kou)模(mo)→真(zhen)空泵(beng)自噴制冷(leng)→管件制冷(leng)減溫→牽引帶(dai)→激光切(qie)割→檢(jian)測(ce)品質(zhi)→進庫。
3、機器(qi)設備的挑選(xuan):聚丙稀管(guan)件(jian)多選(xuan)用(yong)通用(yong)性單單螺桿(gan)擠出機生產制造成形。
擠出(chu)機螺(luo)桿(gan)構造(zao)為等牙距不一深(shen)漸變色(se)型,高徑(jing)(jing)為(25~30):1,發(fa)動(dong)機壓縮(suo)比為2.5~4。成(cheng)形模具設計多見直(zhi)(zhi)(zhi)連式(shi),芯軸(zhou)定形豎(shu)直(zhi)(zhi)(zhi)一部分長L=(2~5)D(D為管(guan)(guan)件(jian)的直(zhi)(zhi)(zhi)徑(jing)(jing),直(zhi)(zhi)(zhi)徑(jing)(jing)鐘頭取最大(da)值(zhi),管(guan)(guan)件(jian)直(zhi)(zhi)(zhi)徑(jing)(jing)大(da)時取小值(zhi))。口模套的內徑(jing)(jing)d=D/(1-δ)(D為管(guan)(guan)件(jian)直(zhi)(zhi)(zhi)徑(jing)(jing),δ為管(guan)(guan)件(jian)縮(suo)水(shui)率,一般δ=2.7%~4.7%)。
4、管件擠壓(ya)成形加工(gong)工(gong)藝(yi)溫度:料筒的投(tou)料段(duan)150~165℃,熔(rong)融段(duan)170~180℃,均化段(duan)190~220℃。成形模(mo)貝溫度190~220℃。
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