Nau'in filastik a cikin tsarin gyare-gyare na thermoplastic, saboda canjin ƙarar da ke haifar da crystallization, danniya mai ƙarfi na ciki, babban damuwa mai daskarewa a cikin ɓangaren filastik, ƙarfin kwayoyin halitta da sauran dalilai, idan aka kwatanta da robobi na thermosetting, raguwar raguwa ya fi girma, kewayon shrinkage yana da faɗi, kuma jagorar a bayyane take. Bugu da kari, raguwar ragewar bayan annalawa ko kula da zafi gabaɗaya ya fi na robobin zafin jiki girma.

Lokacin da aka ƙera ɓangaren robobi, narkakkar kayan yana tuntuɓar saman rami, kuma saman saman waje nan da nan ya yi sanyi ya samar da harsashi mai ƙarancin ƙarfi. Saboda ƙarancin zafin zafin jiki na filastik, ɓangaren filastik na ciki yana yin sanyi sannu a hankali don samar da babban kauri mai ƙarfi tare da raguwa mai girma. Saboda haka, kaurin bango, jinkirin sanyaya da kauri mai girma-yawa yana raguwa sosai. Bugu da ƙari, kasancewar ko rashi na abubuwan da aka saka, shimfidawa da adadin abubuwan da aka sanyawa kai tsaye suna shafar jagorancin kayan aiki, rarrabawa mai yawa da juriya na raguwa, don haka halayen sassan filastik suna da tasiri mai girma akan girman shrinkage da shugabanci.
Siffar, girman da rarraba mashigar ciyarwa kai tsaye suna shafar jagorar kwararar kayan abu, rarraba yawa, matsa lamba da tasirin ciyarwa da samar da lokaci. Idan sashin tashar jiragen ruwa na kai tsaye da tashar abinci yana da girma (musamman idan sashin yana da kauri), raguwa yana da ƙananan amma shugabanci yana da girma, kuma idan nisa da tsayin tashar jiragen ruwa sun kasance gajere, jagorancin yana da ƙananan. . Idan yana kusa da tashar ciyarwa ko kuma yayi daidai da jagorar kwararar kayan, raguwa yana da girma.
Yanayin gyare-gyare: babban zafin jiki mai ƙima, jinkirin sanyaya narkakkar kayan abu, babban yawa da babban raguwa. Musamman ga kayan kristal, raguwa ya fi girma saboda babban crystallinity da babban canjin girma. Rarraba zafin jiki na mold kuma yana da alaƙa da sanyaya ciki da waje na sassa filastik da daidaituwar yawa, wanda kai tsaye yana rinjayar girman da shugabanci na raguwa na kowane bangare. Bugu da ƙari, riƙe matsa lamba da lokaci kuma suna da tasiri mai yawa akan haɗin gwiwa. Wadanda ke da babban matsin lamba da dogon lokaci suna da ƙananan ƙanƙanta amma babban shugabanci.
Matsin allura yana da girma, bambancin danko na kayan da aka narkar da shi karami ne, danniya mai karfi na tsaka-tsakin yana da karami, kuma sake dawo da na roba bayan dimuwa yana da girma, don haka ana iya rage raguwar yadda ya kamata. Yanayin zafin jiki yana da girma, raguwa yana da girma, amma shugabanci yana da ƙananan. Don haka, raguwar sassan filastik kuma za'a iya canza shi daidai ta hanyar daidaita yanayin ƙira, matsa lamba, saurin allura da lokacin sanyaya.
A lokacin ƙirar ƙira, za a ƙayyade ƙimar ƙimar kowane ɓangaren ɓangaren filastik bisa ga gwaninta bisa ga kewayon raguwa na robobi daban-daban, kauri na bango da siffar sassan filastik, tsari, girman da rarraba mashigar abinci, sannan kuma rami. girman za a lissafta. Don ɓangarorin filastik
ƙira
② Canjin girman sassa na filastik da za a bi da su bayan jiyya za a ƙayyade bayan jiyya (ma'auni dole ne ya kasance awanni 24 bayan lalatawa).
③ Gyara mutuwa bisa ga ainihin raguwa.
④ Gwada mold sake, kuma canza tsari yanayin yadda ya kamata, da kuma dan kadan gyara shrinkage darajar saduwa da bukatun na filastik sassa.
A fluidity na thermoplastics za a iya kullum ana nazari daga jerin fihirisa kamar kwayoyin nauyi, narke index, Archimedean karkace kwarara ya kwarara, fili danko da kwarara rabo (tsari tsawon / roba part kauri bango).
Idan nauyin kwayoyin karami ne, rarraba nauyin kwayoyin halitta yana da fadi, tsarin tsarin kwayoyin halitta ba shi da kyau, ma'auni na narkewa yana da girma, tsayin ƙuƙuka yana da tsayi, danko na fili yana ƙarami, kuma rabon kwarara yana da girma, ruwa yana da yawa. mai kyau. Don robobi tare da sunan samfurin iri ɗaya, dole ne a bincika umarnin don sanin ko ƙimar su ta dace da gyare-gyaren allura.Bisa ga buƙatun ƙirar ƙirar ƙira, za a iya rarraba ruwa na filastik na yau da kullun zuwa nau'ikan uku:
① Good fluidity PA, PE , PS, PP, CA, poly (4) methylene:
② Polystyrene jerin resins tare da matsakaiciyar ruwa (kamar ABS, kamar), PMMA, POM da polyphenylene ether;
③ Poor fluidity PC, wuya PVC, polyphenylene ether, polysulfone, fluoroplastics.
Ruwan robobi daban-daban kuma yana canzawa saboda abubuwan gyare-gyare daban-daban. Babban abubuwan da ke haifar da tasiri sune kamar haka:
① Lokacin da zafin jiki yayi girma, yawan ruwa yana ƙaruwa, amma robobi daban-daban kuma suna da bambance-bambance. Ruwan ruwa na PS (musamman waɗanda ke da juriya mai ƙarfi da ƙimar MFR), PP, PA, PMMA, polystyrene da aka gyara (kamar ABS, kamar), PC, Ca da sauran robobi suna canzawa sosai tare da zafin jiki. Don PE, POM da, karuwa ko raguwar zafin jiki yana da ɗan tasiri akan yawan ruwan su. Saboda haka, tsohon ya kamata ya daidaita yanayin zafi don sarrafa ruwa.
② Tare da karuwar ƙwayar allura, kayan da aka narkar da su za su kasance da yawa sosai kuma ruwa zai karu, musamman ma PE da POM sun fi damuwa, don haka ya kamata a daidaita matsa lamba don sarrafa ruwa a lokacin gyare-gyare.
③ Mold tsarin, gating tsarin tsari, size, layout, sanyaya tsarin zane, narkakkar kayan ya kwarara juriya (kamar surface gama, abu tashar tashar kauri, kogo siffar, shaye tsarin) da sauran dalilai kai tsaye rinjayar da ainihin fluidity na narkakkar abu a cikin rami. Idan aka sa narkakkar kayan don rage zafin jiki da haɓaka juriya, za a rage yawan ruwan.
Za a zaɓi tsari mai ma'ana bisa ga ruwa na filastik da aka yi amfani da shi a cikin ƙirar ƙira. A lokacin gyare-gyaren, zafin kayan abu, zazzabi mai ƙira, matsa lamba na allura, saurin allura da sauran abubuwan kuma ana iya sarrafa su don daidaita yanayin cikawa da kyau don biyan buƙatun gyare-gyare.
Crystalline thermoplastics za a iya raba crystalline robobi da amorphous (wanda aka sani da amorphous) robobi. Lamarin da ake kira crystallization al'amari al'amari ne cewa kwayoyin halitta suna motsawa da kansu kuma gaba ɗaya a cikin wani yanayi mara kyau daga yanayin narkewa zuwa yanayin daɗaɗɗen robobi, kuma ya zama al'amari cewa kwayoyin suna daina motsi cikin yardar kaina, danna madaidaicin matsayi kaɗan, kuma suna da. Halin yin tsarin kwayoyin halitta ya zama samfurin al'ada.
A matsayin ma'auni na bayyanar don yin hukunci akan waɗannan nau'ikan robobi guda biyu, ana iya ƙayyade shi ta hanyar bayyana gaskiyar sassan filastik bango mai kauri na robobi. Gabaɗaya, kayan lu'ulu'u ba su da ƙarfi ko shuɗi (kamar POM), kuma kayan amorphous suna bayyana (kamar PMMA). Duk da haka, akwai keɓancewa. Misali, poly (4) methylene shine filastik crystalline tare da nuna gaskiya, kuma ABS abu ne mai amorphous amma ba m.
Dole ne a lura da buƙatun masu zuwa da matakan kariya don robobi na crystalline yayin ƙirar ƙira da zaɓi na injin gyare-gyaren allura:
① Ana buƙatar ƙarin zafi don zafin jiki na abu don haɓaka yanayin zafin jiki, don haka yakamata a yi amfani da kayan aiki tare da babban ƙarfin filastik.
② Zafin da ake fitarwa yayin sanyaya da sake yin amfani da shi yana da girma, don haka ya kamata a sanyaya sosai.
③ Bambancin ƙayyadaddun nauyi tsakanin narkakkar jihar da m jihar ne babba, da gyare-gyare shrinkage ne babba, kuma shrinkage da porosity ne mai sauki faruwa.
④ Saurin sanyaya, ƙananan crystallinity, ƙananan raguwa da babban nuna gaskiya. Ƙa'idar crystallinity yana da alaƙa da kauri na bango na ɓangaren filastik. Kaurin bango yana da fa'idodi na jinkirin sanyaya, babban crystallinity, babban shrinkage da kyawawan kaddarorin jiki. Sabili da haka, dole ne a sarrafa yanayin zafin jiki na kayan kristal kamar yadda ake buƙata.
⑤ Muhimmancin anisotropy da babban damuwa na ciki. Bayan rushewa, kwayoyin da ba su da crystallized suna iya ci gaba da yin kyalkyali, suna cikin yanayin rashin daidaituwar kuzari, kuma suna da saurin nakasu da yaƙe-yaƙe.
⑥ Matsakaicin zafin jiki na crystallization yana da kunkuntar, kuma yana da sauƙi don allurar kayan da ba a narkewa ba a cikin mutu ko toshe mashigar abinci.
Hankalin zafi yana nufin yanayin canza launi, lalacewa da ruɓewar wasu robobi waɗanda suka fi dacewa da zafi. Lokacin da suke zafi na dogon lokaci a babban zafin jiki ko kuma sashin abincin abinci yana da ƙananan ƙananan kuma tasirin raguwa yana da girma, yawan zafin jiki yana ƙaruwa. Filastik masu wannan siffa ana kiran su robobi masu zafin zafi.
Irin su wuya PVC, polyvinylidene chloride, vinyl acetate copolymer, POM, polytrichlorethylene fluoride, da dai sauransu Thermal m robobi samar monomer, gas, m da sauran ta-samfurin a lokacin bazuwar, musamman ma wasu bazuwar iskar gas da kara kuzari, lalata ko guba ga jikin mutum. kayan aiki da molds. Saboda haka, ya kamata a biya hankali ga ƙirar ƙira, zaɓi na injin gyare-gyaren allura da gyare-gyare. Ya kamata a zaɓi injin gyare-gyaren allura. Sashin tsarin gating ya kamata ya zama babba. Samfurin da ganga ya kamata a yi masu chrome plated ba tare da tsayawar angular ba. Dole ne a kula sosai da zafin jiki na gyare-gyare kuma dole ne a ƙara stabilizer a cikin filastik don raunana yanayin zafinsa.
Ko da wasu robobi (irin su PC) suna ɗauke da ɗan ƙaramin ruwa, za su ruɓe a ƙarƙashin matsanancin zafin jiki da matsa lamba. Ana kiran wannan dukiya mai sauƙi hydrolysis, wanda dole ne a yi zafi kuma a bushe a gaba.
Qingdao Sainuo Chemical Co., Ltd. Mu ne masana'anta don PE kakin zuma, PP kakin zuma, OPE kakin zuma, EVA kakin zuma, PEMA, EBS, Zinc / Calcium Stearate…. Kayayyakin mu sun wuce REACH, ROHS, PAHS, gwajin FDA. Sainuo rest assured wax, maraba da tambayar ku! Yanar Gizo:https://www.sanowax.com
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