Mitundu yoyambira ndi magawo akulu a zomangira zomangira jakisoni: Nthawi zambiri, screw imagawidwa m'magawo atatu: gawo lodyetsa, gawo lopondereza, ndi gawo la homogenization. Gawo lodyetsa - lokhala ndi mainchesi ocheperako, ntchito yake yayikulu ndikunyamula zida kupita kuzigawo zotsatila; Choncho, nkhawa yaikulu ndi kufalitsa mphamvu. Zigawo: (L1, h1), h1=(0.12 - 0.14)D. Chigawo cha kuponderezana - ndi kusintha koyambira m'mimba mwake, ntchito yake yaikulu ndikugwirizanitsa ndi kusungunula zakuthupi, kukhazikitsa kupanikizika. Zoyezera: kuponderezana ε=h1/h3 ndi L2. Zolondola ziyenera kuwonetsedwa pogwiritsa ntchito gradient A=(h1 - h3)/L2. Gawo la homogenization (gawo la metering) - limatulutsa zinthu zosungunuka kuchokera ku gawo loponderezedwa mpaka kutsogolo kwa screw pa kuchuluka kokhazikika ndi kutentha. Zigawo: (L3, h3), h3=(0.05 - 0.07)D.
Pa screw yonse, parameter ya L/D (utali-ku-diameter ratio) ili ndi zabwino zingapo ndi kuipa kwake: L/D, pamodzi ndi liwiro la rotational n, ndi chinthu chofunikira kwambiri pakupanga pulasitiki ndi mphamvu ya screw. L/D yokulirapo imabweretsa nthawi yayitali yokhala mumgolo, zomwe zimapindulitsa pakupanga pulasitiki. Zimachepetsanso kuthamanga kwa kuthamanga ndi kutayikira, kupititsa patsogolo mphamvu ya plasticizing. Izi ndizopindulitsanso pazinthu zomwe zili ndi zofunikira zogawa kutentha kwakukulu. Komabe, L/D yokulirapo imatha kusokoneza kupanga, kusonkhanitsa, ndi kugwiritsa ntchito. Nthawi zambiri, L/D ili pakati pa 18 ndi 20, koma pali zomwe zikuchitika pakukulitsa. Zina ndi monga screw pitch S ndi helix angle φ=πDtgφ. Nthawi zambiri, D=S, kotero φ=17 digirii 40′. φ zimakhudza mphamvu ya pulasitiki; kawirikawiri, chokulirapo φ chimabweretsa liwiro lotumizira mwachangu. Choncho, φ amasiyana malinga ndi mawonekedwe a zinthu. Kwa ufa, φ ikhoza kukhala pafupifupi 25 digiri; kwa cylindrical zipangizo, kuzungulira 17 digiri; ndi zida za block, kuzungulira 15 digiri. Komabe, zosiyana za φ zimapangitsa kuti ntchito ikhale yovuta kwambiri, kotero φ nthawi zambiri imatengedwa ngati 17 digiri 40′. Kwa zida zokhala ndi mamasukidwe otsika, m'lifupi e ayenera kukhala wamkulu momwe angathere. Ma e ang'onoang'ono amatha kutayikira, koma ma e ambiri amawonjezera kugwiritsa ntchito mphamvu ndikupangitsa kutentha kwambiri. e=(0.08~0.12)D. Mwachidule, pansi pazimenezi, chifukwa cha kusowa kwa njira zoyesera zofunikira, palibe njira yokwanira yopangira mapangidwe a screw.
