Screw structure hian heng effects awm zat hi direct in a nghawng a ni. Injection molding screw structure hman tlanglawn tak takte chu split-type, barrier-type, leh flow-diverting screw te hi plasticizing quality tihchangtlunna tura siam te an ni. Barrel hi a bul berah chuan circular tube a ni a, a laiah discharge port a awm bawk. Plasticizing process chhung hian hmalam panna leh mixing atana driving force chu screw leh barrel relative rotation atanga lo chhuak a ni.
Screw channel-a plastic chi hrang hrang atanga thlirin, screw hi a tlangpuiin section pathum-ah then a ni a, chungte chu solid conveying section (feeding section tia koh bawk), melting section (compression section tia koh bawk), leh homogenization section (metering section tia koh bawk) te an ni.
(1) Plasticizing Molding chungchanga thu bulpui ber berte
Plastic chu rotating screw conveying action hmangin hmalam pan zel a ni. Hetianga a kal lai hian plastic hian barrel heating, screw frictional heat leh shear heat te inzawmkhawm a tawk a, zawi zawiin a nem a, a tawpah chuan melt (chu chu molten viscous flow state-ah) a lo ni ta a ni. Melt chu screw lu-ah an nawr a, barrel hma lam (chu chu dahna hmun) hmunah chuan screw inherin a dah a ni. Storage zone-a melt hian pressure engemaw zat a nei a, chu chuan screw-ah hna a thawk a, hnunglam hawiin a nawr a ni. Screw chu a hnungtawlh thei em tih leh a hnungtawlh chak dan chu a hneh ngei ngei tur resistance hrang hrang (frictional resistance, injection cylinder chhunga working oil backflow resistance, chu chu injection cylinder back pressure, screw back pressure tia hriat bawk, etc.)-ah a innghat a ni. Injection screw pawh hian a inher laiin backward linear motion a neih avangin plasticizing process chu a buaithlak zual hle. Tunah hian he thil kalphung sawifiah tur hian theory puitling a awm lo va, structural design tam tak chu thil tawn atanga siam a ni.
(2) Screw Structure Terminology bulpui leh a kaihhnawih hnathawh
Feeding Section: Feeding section-ah hian feeding zone (cooling hopper zone tia hriat bawk), solid conveying zone, leh transitional lag zone te a awm a. A hna ber chu plastic chu compact leh convey a ni. He section hnathawh dan chu hetiang hi a ni: Feeding hopper atanga plastic chu screw chhunga a luh hnuah, rotating screw hnathawh hnuaia barrel chhung lam bang leh screw chunglam inkara inhnawh tawnna hmangin hmalam pan a ni a, a compact a ni. A tlangpuiin plastic chu feeding section-ah solid state-in hmalam pan a ni.
Experimental observation-ah chuan, a tlangpuiin feeding section tawp hnaihah, frictional heat nasa tak avang hian barrel chhung lam bang nena inzawm plastic chu viscous flow temperature a thleng a, a hmin tan a, chu chuan transition zone a siam a ni.
(3) Compression Section tih a ni
He section hnathawh chu plastic chu compact leh plasticize lehzual a, plastic chhehvel boruak chu feeding port-ah discharge turin nawr leh a, plastic thermal conductivity tihchangtlun a ni. He section-a screw channel hi compression type a ni tur a ni. Hnathawh dan chu hetiang hi a ni: Feeding section atanga plastic chu melting section-a a luh chuan, plastic chu hmalam pan a kal zel angin, leh screw groove a thuk zauh zauh avang te, chubakah filter screen, diverter plate leh die head-a obstruction effect avang te chuan plastic chu pressure sang tak a siam zauh zauh a, a compact lehzual a ni. Chutih rual chuan, thil chu barrel atanga pawn lam atanga lumna leh screw leh barrel inkarah nasa takin stirring, mixing leh shearing a awm a, chu chuan plastic temperature a tisang zel a ni. Plastic hmin (liquid phase emaw molten pool emaw an tih) hi a pung zel a, solid plastic (solid phase emaw solid bed an tih) erawh a tlahniam zel thung. Melting section tawp lamah chuan plastic zawng zawng emaw a tam zawk emaw chu a hmin vek a, viscous flow state-ah a inthlak a ni.
