Pali njira zambiri zogawira nkhungu zapulasitiki, ndipo zitha kugawidwa m'magulu otsatirawa malinga ndi njira zosiyanasiyana zopangira ndi kukonza magawo apulasitiki:
Jekeseni nkhungu imatchedwanso jekeseni nkhungu.Njira yopangira nkhungu iyi imadziwika ndi kuyika zida za pulasitiki mu mbiya yotentha yamakina ojambulira.Pulasitiki imatenthedwa ndikusungunuka, ndipo imayendetsedwa ndi wononga kapena plunger ya makina ojambulira, imalowa mu nkhungu kudzera mumphuno ndi ndondomeko yothira nkhungu, ndipo pulasitiki imapangidwa mu nkhungu poteteza kutentha, kukakamiza, ndi kuziziritsa.Chifukwa chotenthetsera ndi kukanikiza chipangizochi chimatha kugwira ntchito pang'onopang'ono, kuumba jekeseni sikungangoumba mbali zapulasitiki zokhala ndi mawonekedwe ovuta, komanso kukhala ndi magwiridwe antchito apamwamba komanso abwino.Choncho, jekeseni akamaumba nkhani gawo lalikulu mu akamaumba mbali pulasitiki, ndi jekeseni zisamere nkhungu chifukwa theka la akamaumba pulasitiki.Makina ojambulira amagwiritsidwa ntchito makamaka popanga thermoplastics.M'zaka zaposachedwa, idagwiritsidwanso ntchito pang'onopang'ono popanga mapulasitiki a thermosetting.
Compression mold imatchedwanso compression mold kapena rabara mold.The akamaumba ndondomeko khalidwe nkhungu ndi kuti pulasitiki zopangira mwachindunji anawonjezera lotseguka nkhungu patsekeke, ndiyeno nkhungu chatsekedwa.Pambuyo pa pulasitiki mumkhalidwe wosungunuka pansi pa kutentha ndi kupanikizika, patsekekeyo imadzazidwa ndi mphamvu inayake.Panthawiyi, mawonekedwe a pulasitiki a pulasitiki amapangidwa ndi mankhwala osokoneza bongo, omwe pang'onopang'ono anaumitsa ndikuyika.Makatani oponderezedwa amagwiritsidwa ntchito kwambiri popanga mapulasitiki a thermosetting, ndipo mbali zapulasitiki zomwe zimagwiritsidwa ntchito nthawi zambiri zimagwiritsidwa ntchito popangira magetsi komanso zofunikira zatsiku ndi tsiku.
Kusamutsa nkhungu amatchedwanso jekeseni nkhungu kapena extrusion nkhungu.Njira yopangira nkhungu iyi imadziwika kuti pulasitiki yaiwisi imawonjezedwa ku chipinda chodyera chotenthedwa, ndiyeno kupanikizika kumagwiritsidwa ntchito pazitsulo zapulasitiki m'chipinda chodyera ndi mzere wokakamiza.Pulasitiki imasungunuka pansi pa kutentha kwakukulu ndi kupanikizika ndipo imalowa m'mimba kudzera mu ndondomeko yothira nkhungu.Kulumikizana kwa mankhwala kumachitika ndipo pang'onopang'ono kumalimba.Njira yosinthira posamutsa imagwiritsidwa ntchito kwambiri pamapulasitiki a thermosetting, omwe amatha kupanga zida zapulasitiki zovuta kwambiri.
Extrusion kufa amatchedwanso extruder mutu.Chikombolechi chimatha kupanga mapulasitiki okhala ndi mawonekedwe ofanana, monga mapaipi apulasitiki, ndodo, ndi mapepala.Chipangizo cha extruder chotenthetsera ndi kukanikiza ndi chofanana ndi cha makina a jakisoni.Pulasitiki yosungunuka imadutsa pamutu wamakina kuti ipange gawo la pulasitiki lopangidwa mosalekeza, lomwe limagwira ntchito bwino kwambiri.
Nthawi yotumiza: Aug-18-2021