Tonse tikudziwa kuti zinthu zapulasitiki nthawi zambiri zimakhala ndi chiwopsezo, ndipo zimachepa zikatsika.Zopangidwa kuchokera kuzinthu zosiyanasiyana zimakhala ndi mitengo yocheperako yosiyana.Apa, tikambirana zinthu zingapo zomwe zimalimbikitsa kuchepa kwa nkhokwe za pulasitiki panthawi yopanga.Ndipotu, popanga, ngati mukufuna kuti kukula kwa mankhwala kukhale koyenera, ndizothandiza kumvetsetsa zinthu zomwe zimakhudza kugwirizana.Kupatula apo, m'makampani opanga zinthu zamafakitale, zotengera za pulasitiki nthawi zambiri zimakhala zotengera zofananira.Kukula kwake ndi tsatanetsatane ndi zolondola molingana ndi muyezo, ndipo palibe kupatuka.Apo ayi, sitinganene kuti generalization ndi yokhazikika.
The akamaumba ndondomeko yabokosi logulitsira pulasitikindi thermoplastic akamaumba.Chifukwa cha kusintha kwa voliyumu panthawi yopangira crystallization, kupsinjika kwamkati kumakhala kwakukulu, ndipo pali kupsinjika kotsalira mkati mwa chinthu cha nkhungu, ndipo mawonekedwe a maselo ndi amphamvu kwambiri.Chifukwa chake, ili ndi chiwopsezo chokwera kwambiri kuposa mapulasitiki a thermosetting.Ili ndi mayendedwe okulirapo komanso njira yodziwika bwino.Popeza wosanjikiza wakunja wa zinthu zosungunula amalumikizana ndi nkhungu pamwamba pa chigawo cha pulasitiki chopangidwa, nthawi yomweyo amazizidwa kuti apange chipolopolo cholimba chochepa.Ndipo ife tonse tikudziwa kuti matenthedwe matenthedwe a pulasitiki ndi osauka kwambiri, ndipo wosanjikiza wamkati wa pulasitiki chiwongolero bokosi kuziziritsa pang'onopang'ono, kupanga mkulu-kachulukidwe wosanjikiza olimba mlingo waukulu shrinkage.Ngati makulidwe a khoma ndi pang'onopang'ono, wosanjikiza wokwera kwambiri adzakhuthala ndipo adzachepa kwambiri.
The akamaumba ndondomeko yabokosi logulitsira pulasitikindi thermoplastic akamaumba.Chifukwa cha kusintha kwa voliyumu panthawi yopangira crystallization, kupsinjika kwamkati kumakhala kwakukulu, ndipo pali kupsinjika kotsalira mkati mwa chinthu cha nkhungu, ndipo mawonekedwe a maselo ndi amphamvu kwambiri.Chifukwa chake, ili ndi chiwopsezo chokwera kwambiri kuposa mapulasitiki a thermosetting.Ili ndi mayendedwe okulirapo komanso njira yodziwika bwino.Popeza wosanjikiza wakunja wa zinthu zosungunula amalumikizana ndi nkhungu pamwamba pa chigawo cha pulasitiki chopangidwa, nthawi yomweyo amazizidwa kuti apange chipolopolo cholimba chochepa.Ndipo ife tonse tikudziwa kuti matenthedwe matenthedwe a pulasitiki ndi osauka kwambiri, ndipo wosanjikiza wamkati wa pulasitiki chiwongolero bokosi kuziziritsa pang'onopang'ono, kupanga mkulu-kachulukidwe wosanjikiza olimba mlingo waukulu shrinkage.Ngati makulidwe a khoma ndi pang'onopang'ono, wosanjikiza wokwera kwambiri adzakhuthala ndipo adzachepa kwambiri.
Kudyetsa doko mawonekedwe a kupanga equipment'size yaiwisi kugawa ndi zinthu zina zidzakhudza mwachindunji otaya malangizo, katundu kachulukidwe kachulukidwe kugawa, kuthamanga chitetezo contraction ndi akamaumba nthawi, mwachindunji zimakhudza shrinkage mlingo wabokosi logulitsira pulasitiki.Pamene zidazo zili ndi chiwongolero chachindunji, gawo lolowera pamtunda ndi lalikulu kwambiri, makamaka pamene liri lakuda, chiwerengero cha shrinkage chidzakhala chaching'ono koma chowongolera.Mosiyana ndi zimenezi, pamene kukula kwa malowa kuli kochepa, njira yodutsamo imakhala yaying'ono, ndipo kuchuluka kwa shrinkage kumakhala kwakukulu pamene cholowera chili pafupi ndi cholowera kapena chofanana ndi njira yolowera.
Kupanga akamaumba zinthu zimakhudza kwambiri shrinkage mlingo wabokosi logulitsira pulasitiki.Mwachitsanzo, ngati nkhungu ikutentha kwambiri ndipo zinthu zosungunula zimakula pang'onopang'ono, pali kachulukidwe kakang'ono ndipo kuchuluka kwa shrinkage kumakhala kwakukulu.Zinthu za crystalline zimakhala ndi crystallinity yapamwamba komanso voliyumu yayikulu, kotero kuchuluka kwa shrinkage kumakhala kokulirapo.Kugawidwa kwa kutentha kwa nkhungu ndi digiri ya kuzizira kwa mkati ndi kunja ndi kufanana kwa kachulukidwe ka zigawo za pulasitiki kudzakhudza mwachindunji kuchuluka kwa shrinkage ndi malangizo a gawo lililonse la mankhwala.Kukula kwa kukakamiza kosungira komanso kutalika kwa nthawi yosungira kumakhalanso ndi chiwopsezo chachikulu pamlingo wocheperako.Pamene kupanikizika kuli kwakukulu komanso kwautali, chiwongoladzanjacho chimakhala chochepa, koma njira yake ndi yaikulu.Panthawi yowumba, kuchuluka kwa shrinkage kwa bokosi lachiwongola dzanja la pulasitiki kumatha kusinthidwa moyenera ndikusintha kutentha kwa nkhungu ndi kuthamanga kwa jekeseni wamagetsi ndi nthawi yozizira.Malinga ndi pamwamba, tikhoza kudziwa mlingo shrinkage wa gawo lililonse la mankhwala malinga ndi pulasitiki zolowa bokosi shrinkage khoma makulidwe mawonekedwe chakudya cholowera mawonekedwe ndi kukula ndi kufalitsa nkhungu kapangidwe, ndiyeno kuwerengera cavity.size.Malinga ndi shrinkage mlingo weniweni wa mankhwala, kusintha nkhungu ndi kusintha jekeseni akamaumba zinthu kukonza mankhwala shrinkage mlingo kukwaniritsa zofunika zenizeni.
Nthawi yotumiza: Nov-25-2022