Make Extrusion - Kaʻina Hoʻokuʻu Polymer

Ke hoʻoheheʻe ʻia ka polymer, hui ʻia a kaomi ʻia i loko o kahi extruder, e puhi ʻia ma o ka extrusion die no ka hana mau ʻana (ma hope o ka hoʻoluʻu ʻana a me ka paʻa ʻana) i huahana hope loa.ʻO nā ʻano make maʻamau he palahalaha, annular a me proŽle.ʻO nā huahana i hana ʻia e ka extrusion, ʻo ia ka paipu, ka paipu, ka uhi ʻana o ka uea, nā ʻōmole plastik, nā kiʻiʻoniʻoni a me nā ʻāpana, nā ʻeke plastik, ka uhi ʻana no ka pepa a me ka foil, Ž bres, Ž kanikau, yarns, lipine a me ka laulā o nā proŽfiles.

ʻO ka polymer extrusion ma o ka make he mau mea like me ka extrusion wela o nā metala.I ka hoʻokuke ʻana metala ua hoʻokuʻu ʻia ka mea i mua e ka hipa kāne, ʻoiai ma ka extrusion polymer e hoʻolako mau ʻia ka mea e ka wili wili.I loko o ka extrusion metala wela ka wela mai ka 340°C no ka magnesium a hiki i ka 1325°C no ke kila, a me na kaomi pili ana mai 35 a oi 700 MPa.1 5 I ka polymer extrusion kakaikahi ka wela ma mua o 350°C, a o na kaomi maʻamau, ʻaʻole i emi iki. e hele nui ma luna o 50 MPa ma ka piko wili.Hoʻokumu ʻia ka extrusion paʻa paʻa o nā polymers no ka hana ʻana i kekahi mau huahana ikaika kiʻekiʻe. Ma nā haʻahaʻa haʻahaʻa, ʻo ka molecular orientation i hāʻawi ʻia e ka hoʻoikaika ʻana o ka mea ma o ka shaping die e noho mau i ka extrudate.He mau mea like ka Solid State polymer extrusion me ka extrusion anuanu o nā metala.

ʻO ka hoʻokuʻu ʻia ʻana o ke kiʻiʻoniʻoni ke kaʻina hana nui loa no ka hana ʻana i nā kiʻiʻoniʻoni lahilahi mai polyethylene.I ka nui o na hihia, ua hookumuia ka hu'ahu'a ki'i'oni'oni i luna.ʻO ka nui o ke anawaena hū maʻamau he 1.2 - 4 manawa ka nui ma mua o ke anawaena o ka make.Hoʻomaʻalili ʻia ka hoʻoheheʻe wela e nā kahawai annular o ka ea wikiwiki mai nā apo o waho, a i kekahi manawa mai nā mea hoʻolaha ea kūloko.Ke hele nei ka solidiŽ ed Žfilm i loko o kahi kiʻi e kuʻi i ka piko o ka ʻōhū a lawe ʻia e nā wili.ʻO nā kiʻiʻoniʻoni coextruded me 3 - 8 papa (i kekahi manawa a hiki i ka 11) e hana pū ʻia e kēia kaʻina hana, no ka hoʻohana ʻana i ka ʻeke meaʻai.

ʻO ka hoʻolei ʻana i ka Žfilm a me ka pepa extrusion e pili ana i ka hoʻokuʻu ʻana i kahi polymer ma o ka at die me ka puka ākea (a hiki i 10 m), ma luna o kahi huila kila a i ʻole nā ​​​​rola e kinai a paʻa i ka mea hoʻoheheʻe.ʻO ke kiʻiʻoniʻoni ma ke ʻano he huahana ʻoi aku ka lahilahi ma mua o 0.25 mm, a ʻoi aku ka mānoanoa o ka pepa ma mua o kēia.ʻO ka hapa nui o nā mea palahalaha no nā ʻāpana T a i ʻole nā ​​mea pale lole, aia i loko o kahi ʻano e hohola i ka polymer e kahe ana ma ka laula o ka make, a ukali ʻia i lalo me ka hoʻololi ʻana i nā ʻāpana haiki a hāmama e hana i ka hāʻawi kahe i makemake ʻia a me ka hāʻule o ke kaomi.ʻO ka hapa nui o nā laina kiʻiʻoniʻoni i hana ʻia i kēia lā, he laina coextrusion, e hui pū ana i nā papa mai ʻehiku extruders i loko o ka huahana ma o nā multimanifold dies, a i ʻole make hoʻokahi manifold me ke kōkua o nā meaʻai.

I loko o ka extrusion Žfilm, ʻo ka nui o ka ʻako ma nā lehelehe make he ~103 s21.Ke ʻoi aku ka nui o ke koʻikoʻi o ka ʻili o ka pā i kekahi waiwai (maʻa mau 0.14 MPa i nā pepa noiʻi, ʻoi aku ka kiʻekiʻe o ka ʻoihana me ke kōkua o nā mea hoʻohui), nalowale ka ʻili o ka extrudate i kona ʻōlinolino ma muli o ke ʻano o ka haki ʻana o ka ʻili manō. ʻike ʻia e ka maka ʻōlohelohe, kū pololei i ke ala kahe.

ʻO ka hoʻoheheʻe ʻia ʻana o ka paipu a me ka paipu e pili ana i ka puhi ʻana i kahi polymer hoʻoheheʻe ʻia ma oanannulardie, a ma hope o ka huahana i hoʻokuʻu ʻia, ʻoiai e huki ʻia ana, e hele i loko o kahi ʻāpana nui kahi e loaʻa ai kona mau ana hope.Hoʻopili ʻia kēia me ka hoʻoheheʻe ʻana a i ʻole ka hoʻoluʻu ʻana a ʻokiʻoki i nā lōʻihi paʻa.Hana ʻia ka paipu o ke anawaena a hiki i 2 m a ʻoi aku paha ma kēia kaʻina hana, a me nā paipu me nā anawaena mai 10 mm a i lalo o 1 mm.ʻO ka make maʻamau o ka spider a i ʻole ka hoʻolālā spiral mandrel.

Ma nā kaʻina hana uea a me ka uhi uwea, huki ʻia nā uea pākahi a i ʻole nā ​​hui uea me ka wikiwiki loa ma o ka make kea, ma nā kihi ʻākau i ke axis extruder.I ke kiʻekiʻe puʻe extrusion, hui ka polymer hehee me ke uwea a i ʻole ke kaula ma mua o ka puka ʻana o ka make, no ka laʻana, ka hoʻokaʻawale ʻana i nā uea pākahi.Ma ke kaomi haʻahaʻa extrusion, hui ka heheʻe i ke kaula ma hope o ka puka ʻana o ka make, no ka laʻana ka hoʻopaʻa ʻana o nā hui o nā uwea insulated.Loaʻa pinepine ʻia ka nui o ka ʻāhi kiʻekiʻe ma kēia kaʻina hana (a hiki i 106 s2 1) a hoʻohana ʻia nā resins viscosity haʻahaʻa.

ʻO ka extrusion ProŽfile kahi kaʻina hana i hoʻohana ʻia no nā huahana o ka pauku kea mau.Hiki i kēia mau mea mai nā ʻano maʻalahi a hiki i nā profile paʻakikī loa me nā keʻena he nui a me nā manamana lima.E like me na la'ana mai ke ki'i pa'i ki'i, a hiki i ke ka'a ka'a, i ka lihi no ka papa papa, a i ka puka makani.Hoʻonohonoho ʻia nā mea i hoʻokuʻu ʻia ma ke ʻano he paʻa a paʻa paha.ʻO ka laina extrusion proŽle maʻamau he extruder e puhi ana i ka polymer ma o ka proŽle die, a ukali ʻia e kahi pahu nui a i ʻole calibrator, nā pahu hoʻomaha hou, kahi huki a me kahi mea ʻoki.Pono ka ʻike a me ke ahonui no ka hoʻolālā ʻana o ka profile.ʻO ka paipu Polymer a me ka extrusion proŽfile ua like ia me ka extrusion wela o nā metala no ka hana ʻana i nā ʻano hollow mau o nā mea like ʻole.Eia nō naʻe, ʻo ka hoʻohālike makemakika o kēia mau kaʻina no nā metala e pili nui ana i nā kuhiakau elastic - plastic flow hypotheses.

I ka milo hehee, aie ka polimer hehee ma na capillaries he nui i loko o ka milo (a hiki i 1000).Hāʻawi ʻia ka polymer ma lalo o ke kaomi ʻana e kahi pahu pahu no ka ana pono ʻana, ma hope o ka hele ʻana i kahi Žlter e hahai ana i ka extruder.I ka puka ʻana o nā capillaries, hoʻemi ʻia nā kanikau Ž i ke anawaena i makemake ʻia.Ma kēia kaʻina hana, ua hoʻemi ʻia nā Ž bres e ka ikaika kauo i hana ʻia e kahi mokulele lele lele.