Tabbatar da bushewa
Nailan ya fi hygroscopic, idan an fallasa shi zuwa iska na dogon lokaci, zai sha danshi a cikin yanayi. A yanayin zafi sama da wurin narkewa (kimanin 254 ° C), kwayoyin ruwa suna amsawa da nailan. Wannan sinadaran da ake kira hydrolysis ko cleavage, yana sanya nailan oxidizes kuma ya canza launi. Nauyin kwayoyin halitta da taurin guduro sun yi rauni sosai, kuma ana ƙara yawan ruwa. A danshi tunawa da filastik da gas fashe daga cikin hadin gwiwa clamping sassa, haske da aka kafa a kan surface ba santsi, azurfa hatsi, speckle, microspores, kumfa, nauyi narke fadada ba za a iya kafa ko kafa bayan inji ƙarfi rage muhimmanci. A ƙarshe, nailan da wannan hydrolysis ya toshe gaba ɗaya ba zai yuwu ba kuma ba za a iya sake amfani da shi ba ko da an sake bushewa.
Nailan abu kafin allura gyare-gyare bushewa aiki dole ne a dauki tsanani, to bushe zuwa abin da mataki da bukatun gama kayayyakin yanke shawara, yawanci 0.25% kasa, ya fi kyau ba wuce 0.1%, idan dai da albarkatun kasa bushe mai kyau, allura gyare-gyaren ne. mai sauƙi, sassan ba za su kawo matsala mai yawa akan inganci ba.
Nylon ya fi amfani da bushewar bushewa, saboda yanayin yanayin bushewar matsa lamba na yanayi ya fi girma, albarkatun da za a bushe har yanzu suna da alaƙa da iskar oxygen a cikin iska da yuwuwar discoloration oxidation, oxidation mai wuce kima shima zai sami kishiyar sakamako, don haka cewa samar da gaggautsa.
Idan babu kayan bushewa mara amfani, ana iya amfani da bushewa na yanayi kawai, kodayake tasirin ba shi da kyau. Akwai sharuɗɗa daban-daban don yanayin bushewar yanayi, amma ga kaɗan. Na farko shi ne 60 ℃ ~ 70 ℃, abu Layer kauri 20mm, gasa 24h ~ 30h; Na biyu ba fiye da 10h lokacin bushewa a kasa 90 ℃; Na uku shi ne a 93 ℃ ko kasa, bushewa 2h ~ 3h, domin a cikin iska zafin jiki fiye da 93 ℃ da kuma ci gaba da 3h a sama, yana yiwuwa a yi nailan canza launi, don haka zafin jiki dole ne a rage zuwa 79 ℃; Na hudu shine ƙara yawan zafin jiki zuwa fiye da 100 ℃, ko ma 150 ℃, saboda la'akari da nailan fallasa iska na dogon lokaci ko saboda rashin aiki na bushewa; Na biyar shine injin gyare-gyaren allura, bushewar iska mai zafi, zafin iska mai zafi a cikin hopper yana ɗagawa zuwa ƙasa da 100 ℃ ko sama, ta yadda danshin da ke cikin filastik ya ƙafe. Sa'an nan kuma ana ɗaukar iska mai zafi tare da saman hopper.
Idan busassun robobin ya fallasa a cikin iska, zai yi sauri ya sha ruwa a cikin iska kuma ya rasa tasirin bushewa. Ko da a cikin hopper ɗin injin da aka rufe, lokacin ajiya bai kamata ya yi tsayi da yawa ba, gabaɗaya bai wuce awa 1 a cikin kwanakin damina ba, ranakun rana suna iyakance ga awanni 3.
Sarrafa zafin ganga
Yanayin narkewar nailan yana da girma, amma lokacin da ya isa wurin narkewa, dankon sa ya yi ƙasa da na yau da kullun na thermoplastics kamar polystyrene, don haka samar da ruwa ba shi da matsala. Bugu da kari, saboda rheological Properties na nailan, da fili danko ragewa a lokacin da karfi rate karuwa, da kuma narkewa zafin jiki kewayon ne kunkuntar, tsakanin 3 ℃ da 5 ℃, don haka high abu zafin jiki ne garanti na santsi cika mold.
Amma nailan a cikin yanayin narkewa lokacin da kwanciyar hankali na thermal ba shi da kyau, sarrafa kayan aiki da yawa matsakaicin tsayin dumama na iya haifar da lalacewar polymer, don samfuran suna bayyana kumfa, raguwar ƙarfi. Saboda haka, zafin jiki na kowane sashe na ganga ya kamata a tsananin sarrafawa, don haka pellet a cikin babban narkewa zafin jiki, da dumama halin da ake ciki ne kamar yadda m kamar yadda zai yiwu, wasu uniform, don kauce wa mummunan narkewa da kuma gida overheating sabon abu. Amma ga dukan gyare-gyaren, yawan zafin jiki na ganga bai kamata ya wuce 300 ℃ ba, kuma lokacin dumama na pellet a cikin ganga kada ya wuce 30min.
Ingantattun abubuwan kayan aiki
Na farko shi ne halin da ake ciki a cikin ganga, ko da yake akwai wani babban adadin kayan gaba allura, amma juzu'i kwarara na narkakkar abu a cikin dunƙule tsagi da yoyo tsakanin karshen fuskar dunƙule da ciki bango na karkata ganga shi ma yana ƙaruwa. saboda yawan ruwa mai yawa, wanda ba wai kawai yana rage tasirin allurar da adadin abinci ba, har ma a wasu lokuta yana hana ci gaban ciyarwa da kyau, ta yadda dunƙule ba zai iya zamewa baya ba. Don haka, dole ne a shigar da madauki a gaban ganga don hana komawa baya. Amma bayan shigar da rajistan zobe, da kayan zafin jiki ya kamata a ƙara da 10 ℃ ~ 20 ℃ daidai, sabõda haka, da matsa lamba hasãra za a iya rama.
Na biyu shi ne bututun ƙarfe, aikin allura ya ƙare, dunƙule baya, narkakkar da ke cikin tanderun gaba a ƙarƙashin ragowar matsi na iya gudana daga bututun ƙarfe, wato, abin da ake kira "salivation salivation". Idan kayan da za a salivated a cikin rami zai sa sassa da sanyi abu aibobi ko wuya a cika, idan bututun ƙarfe a kan mold kafin cire, kuma ya karu ƙwarai da aiki na matsala, tattalin arzikin ba m. Hanya ce mai inganci don sarrafa zafin bututun ƙarfe ta hanyar saita zoben dumama da aka gyara daban akan bututun ƙarfe, amma hanya mai mahimmanci ita ce canza bututun bututun tare da bututun bututun ramin bazara. Tabbas, kayan bazara da irin wannan nau'in bututun ƙarfe ke amfani da shi dole ne ya zama mai jure yanayin zafi, in ba haka ba zai rasa tasirin sa na roba saboda maimaita matsawa annealing a babban zafin jiki.
Tabbatar da shayewar mutuwa da sarrafa zafin mutu
Saboda babban narkewar nailan, bi da bi, wurin daskarewa shi ma yana da girma, kayan narkewar da ke cikin sanyin sanyi za a iya ƙarfafa su a kowane lokaci saboda yanayin zafi ya faɗi ƙasa da wurin narkewa, yana hana kammala aikin ciko mold. , don haka dole ne a yi amfani da allura mai sauri, musamman ga sassa masu sirara ko sassa na nesa mai nisa. Bugu da kari, babban saurin gyare-gyaren gyare-gyare kuma yana haifar da matsala ta shaye-shaye, ƙirar nailan ya kamata ya sami isassun matakan shaye-shaye.
Naylon yana da buƙatun zafin jiki mafi girma fiye da yanayin zafi na gaba ɗaya. Gabaɗaya magana, babban mold zafin jiki yana da kyau ga kwarara. Yana da mahimmanci ga sassa masu rikitarwa. Matsalar ita ce adadin sanyaya narkewa bayan cika rami yana da tasiri mai mahimmanci akan tsari da kaddarorin nailan guda. Yafi ta'allaka ne a cikin crystallization, a lokacin da shi a cikin high zafin jiki a cikin wani amorphous jihar a cikin rami, crystallization fara, girman da crystallization kudi ne batun high da kuma low m m zafin jiki da zafi canja wurin kudi. Lokacin da sassa na bakin ciki tare da babban elongation, mai kyau nuna gaskiya da tauri ake bukata, da m zafin jiki ya kamata a low don rage matakin crystallization. Lokacin da bango mai kauri tare da babban taurin, ana buƙatar juriya mai kyau da ƙananan lahani a amfani da shi, zafin jiki ya kamata ya zama mafi girma don ƙara darajar crystallization. Nailan mold zazzabi bukatun ne mafi girma, wannan shi ne saboda ta forming shrinkage kudi ne babba, a lokacin da ya canza daga narkakkar jihar zuwa m jihar girma shrinkage ne babba, musamman ga kauri bango kayayyakin, mold zafin jiki ne ma low zai haifar da ciki rata. Sai kawai lokacin da zafin jiki mai kyau yana sarrafawa sosai girman sassan zai iya zama mafi kwanciyar hankali.
Matsakaicin kula da zafin jiki na nailan mold shine 20 ℃ ~ 90 ℃. Zai fi kyau a sami na'urar sanyaya (kamar ruwan famfo) da dumama (kamar sandar dumama wutar lantarki).
Annealing da humidification
Don amfani da zafin jiki sama da 80 ℃ ko tsauraran ƙayyadaddun buƙatun sassan, bayan gyare-gyaren ya kamata a goge shi a cikin mai ko paraffin. Annealing zafin jiki ya zama 10 ℃ ~ 20 ℃ mafi girma fiye da sabis zafin jiki, da kuma lokacin ya zama game da 10min ~ 60min bisa ga kauri. Bayan an shafe shi, ya kamata a sanyaya a hankali. Bayan annealing da zafi magani, za a iya samun fi girma nailan crystal, da kuma rigidity an inganta. Sassan Crystallized, canjin yawa kaɗan ne, ba nakasawa da fatattaka ba. Sassan da aka gyara ta hanyar sanyaya kwatsam suna da ƙarancin crystallinity, ƙaramin crystal, babban tauri da bayyana gaskiya.
Ƙara wakilin nucleating na nailan, gyare-gyaren allura na iya samar da babban crystallinity crystal, zai iya rage sake zagayowar allura, an inganta gaskiya da rigidity na sassan.
Canje-canje a cikin zafi na yanayi na iya canza girman guntun nailan. Nailan kanta adadin raguwa ya fi girma, don kiyaye mafi kyawun kwanciyar hankali, yana iya amfani da ruwa ko maganin ruwa don samar da jiyya. Hanyar ita ce ta jiƙa sassan a cikin ruwan zãfi ko potassium acetate mai ruwa mai ruwa bayani (rabo na potassium acetate da ruwa shine 1.25: 100, wurin tafasa 121 ℃), lokacin shayarwa ya dogara da matsakaicin kauri na bango na sassa, 1.5mm 2h , 3mm 8h, 6mm 16h. Jiyya na humidification na iya inganta tsarin kristal na filastik, inganta ƙarfin sassa, da kuma inganta rarraba damuwa na ciki, kuma tasirin ya fi kyau fiye da maganin annealing.
Lokacin aikawa: 03-11-22