Iindidi ezisisiseko kunye neeparitha eziphambili ze-injection molding screws: Ngokuqhelekileyo, i-screw yahlulwe ibe ngamacandelo amathathu: icandelo lokutya, icandelo loxinzelelo, kunye necandelo le-homogenization. Icandelo lokutya - kunye nobubanzi obuncinci besiseko, umsebenzi walo oyintloko kukuthutha izinto eziluhlaza kumacandelo alandelayo; ngoko ke, eyona nkxalabo iphambili kukuhambisa umthamo. Iiparamitha: (L1, h1), h1=(0.12 - 0.14)D. Icandelo lokunyanzeliswa - kunye nokutshintsha ububanzi besiseko, umsebenzi walo oyintloko kukudibanisa kunye nokunyibilika kwezinto eziphathekayo, ukuseka uxinzelelo. Iiparamitha: umlinganiselo woxinzelelo ε=h1/h3 kunye ne-L2. Ukuchaneka kufuneka kubonakaliswe kusetyenziswa i-gradient A=(h{13}} h3)/L2. Icandelo le-Homogenization (icandelo le-metering) - likhupha izinto ezinyibilikisiweyo ukusuka kwicandelo loxinzelelo ukuya phambili kakhulu kwi-screw kwinani elimiselweyo kunye nobushushu. Iiparamitha: (L3, h3), h{19}} (0.05 - 0.07)D.
Kuso sonke isikrufu, i-L/D (ubude-ukuya{1}}kumlinganiselo wedayamitha) ipharamitha ineenzuzo ezininzi kunye nokungalunganga: i-L/D, kunye nesantya esijikelezayo n, yinto ebalulekileyo kwisakhono seplastikhi sesikrufu kunye nesiphumo. I-L / D enkulu iphumela kwixesha elide lokuhlala kwizinto eziphathekayo kwi-barrel, enenzuzo kwiplastiki. Kwakhona kunciphisa ukuhamba koxinzelelo kunye nokuvuza, ngakumbi ukuphucula umthamo weplastiki. Oku kukwaluncedo kwizinto ezineemfuno zokusasazwa kobushushu obuphezulu. Nangona kunjalo, i-L/D enkulu inokuchaphazela kakubi ukwenziwa, ukudibanisa, kunye nokusetyenziswa. Ngokubanzi, i-L/D iphakathi kwe-18 kunye ne-20, kodwa kukho indlela yangoku yokuyandisa. Ezinye iiparamitha ziquka i-screw pitch S kunye ne-engile ye-helix φ=πDtgφ. Ngokubanzi, D=S, ngoko φ=17 isidanga 40′. φ ichaphazela amandla okwenza iplastiki; Ngokubanzi, enkulu φ iphumela kwisantya sokuhambisa esikhawulezayo. Ngoko ke, φ iyahluka ngokuxhomekeka kwimilo yezinto eziphathekayo. Ngomgubo, i-φ ingaba malunga ne-25 degree; kwizixhobo ze-cylindrical, malunga ne-17 degree; kunye nezixhobo zebhloko, malunga ne-15 degree. Nangona kunjalo, amaxabiso φ ahlukeneyo enza ukuba umsebenzi ube nzima ngakumbi, ke φ ithathwa ngokubanzi njenge-17℃40′. Kwizinto eziphathekayo ezine-viscosity ephantsi, ububanzi e-e kufuneka bube bukhulu ngokusemandleni. Incinci kakhulu i-e iya kukhokelela ngokulula ekuvuzeni, kodwa enkulu kakhulu i-e iya kwandisa ukusetyenziswa kwamandla kwaye ibangele ukufudumeza. e=(0.08~0.12)D. Isishwankathelo, phantsi kweemeko zangoku, ngenxa yokungabikho kweendlela zokulinga eziyimfuneko, akukho ndlela yoyilo epheleleyo yoyilo lwe-screw.
