Pali mitundu yambiri yazinthu zopangidwa ndi thovu la PVC, makamaka kuphatikiza zida zolimba za thovu ndi zinthu zofewa za thovu (monga zida zokhazokha, zikopa zopangira, ndi zina). pulasitiki yaying'ono ndi mtundu wa thovu ndi awiri a 1 ~ 10 μ M, thovu kachulukidwe 1X109 ~ 1 × 1012 / cm3 zatsopano thovu zakuthupi. Poyerekeza ndi mapulasitiki opanda thovu, kachulukidwe ka mapulasitiki ang'onoang'ono amatha kuchepetsedwa ndi 5% ~ 95%. Pambuyo thovu microcellular, PVC osati kuchepetsa kachulukidwe ndi kupulumutsa mtengo, komanso zambiri zabwino thupi ndi makina katundu, monga kulemera kuwala, mphamvu mkulu zimakhudza, kulimba mkulu, wabwino kutchinjiriza kutentha ndi ntchito kutchinjiriza phokoso, madutsidwe otsika ndi matenthedwe madutsidwe, mawonekedwe okongola, kukana kwa asidi ndi alkali, kutsekemera kwa chinyezi ndi kutsutsa-kudzimbirira, kutentha kwa moto ndi moto, kukula kosasunthika, kuumba kosavuta, kuyika pamwamba, kusindikiza kapena kupaka, kukonza kosavuta Kukaniza kwa nyengo yabwino (ingagwiritsidwe ntchito panja) ndi ntchito zina zapamwamba.

sera kwa zinthu thovu PVC

Zipangizo zolimba za PVC zokhala ndi thovu zimakhala ndi ntchito zosiyanasiyana, kuphatikiza matabwa okhala ndi thovu (monga matabwa a phazi lokhala ndi thovu, zingwe zapakhoma zokhala ndi thovu, mapanelo a khoma ndi denga, matailosi amitundu yapadenga, ndi zina), mapaipi a thovu (monga mapaipi oteteza chingwe, mapaipi otulutsa ngalande. za misewu ndi njanji, mipope zomanga ngalande, mipope ulimi ulimi wothirira, mafakitale chitetezo mapaipi, etc.), mbiri thovu (monga njanji zotchinga, gudumu lotsekera chimango mbiri, zitseko ndi zenera mbiri Balcony panel, m'nyumba ndi panja pansi, etc.) .

① Kutulutsa thovu kwaulere kumatanthawuza kukulitsidwa kwaulere kosalekeza kosungunuka mukangochoka, kenako ndikulowa mu chipangizocho ndi kukula kwakukulu pakapita nthawi yochepa. Kutulutsa thovu kwaulere kumapangitsa thovu zonse kupanga pamtanda wa extrudate. Kukula kwa thovu pamwamba kumachepa ndi kuzirala, ndipo potsiriza kachulukidwe kosalekeza, kuuma kwapakati pamadzi ndi mankhwala osalala amapangidwa. Njirayi ili ndi ubwino wa njira yosavuta ndipo ndiyoyenera kupanga zinthu zokhala ndi makulidwe a 2 ~ 6mm, geometry yosavuta komanso pamwamba (monga mapaipi, mapepala ndi mbiri ndi geometry yosavuta).
② Njira yothira thovu mkati, njira yotulutsa thovu pakhungu kapena njira ya celuka imatenga ufa wapadera wokhala ndi pakati kuti ulekanitse zida zapulasitiki, chipangizo choyikiracho chimalumikizidwa ndi kufa, ndipo mawonekedwe ake akunja ndi ofanana ndi kufa. Zinthuzo zikatumizidwa kumalo osungira kutsogolo kwa cholowera, chosungunula chomwe chili ndi thovu chimalowa m'manja ozizira chikangochoka pakamwa, ndikuzizira mwachangu padziko lonse lapansi, kuti zisapangike. a thovu pamwamba ndi kutupa kulikonse pa gawo la extrudate, kuti apange khungu wosanjikiza pamwamba. Nthawi yomweyo, pachimake mu kufa kumapangitsa kuti patsekeke kupangidwa mu theka-anamaliza mankhwala kudzazidwa ndi thovu opangidwa ndi otsala kusungunuka, ndiko, thovu mkati. Poyang'anira kuzizira kwambiri, zinthu zokhala ndi makulidwe a 0.1 ~ 10mm ndi makulidwe a khoma lazoposa 6mm zitha kupezeka. Njirayi imatha kupanga mbiri yokhala ndi mawonekedwe ovuta. Zogulitsazo zimakhala ndi mawonekedwe osalala, kuuma kwakukulu komanso kutsika kochepa m'dera lapakati. Kuphatikiza apo, kuphatikiza njira iyi ndi njira ①, chinthu chokhala ndi khungu mbali imodzi ndi ufulu kumbali inayo chikhoza kupezeka.

③ Coextrusion imagwiritsa ntchito mutu wophatikizika ndi ma extruder awiri kutulutsa wosanjikiza wosatulutsa thovu komanso wosanjikiza wa thovu motsatana. Mitundu kapena chilinganizo cha zigawo ziwiri za pulasitiki zitha kusinthidwa malinga ndi zosowa kuti zinthuzo zigwirizane ndi kachulukidwe ndi kukula kofunikira ndi muyezo. Mapaipi ambiri a thovu opangidwa ku China amapangidwa ndi njirayi.
Ngakhale njira zitatu zomwe tafotokozazi zili ndi mawonekedwe awoawo pakuphatikizidwa kwa fomula, kapangidwe kake ndi ukadaulo wopanga, momwe mungayang'anire kutulutsa thovu kwa kusungunula ndikupeza mawonekedwe a cell okhutiritsa ndiye vuto lalikulu pakutulutsa. Kutulutsa thovu komaliza kwa gasi wosungunuka mu kusungunuka kumachitikadi "mwadzidzidzi" kusungunuka kumasiya kufa. Pambuyo pa kusungunuka kumasiya kufa, chifukwa cha kutsika kwadzidzidzi kwa kuthamanga kozungulira ndi kusintha kwa kutentha, mpweya wosungunuka uli mu supersaturated state, kupatukana kwa magawo awiri a gasi, ndipo ma microbubbles ambiri amapangidwa pa nucleation. mfundo. Kukula kwa kuwira kukula zimadalira zimalimbikitsa nthunzi kuthamanga kwa kuwola mpweya ndi ductility ndi mphamvu kusungunula palokha. Kumbali imodzi, pansi pa mphamvu ya mpweya, thovu limakula mosalekeza; Kumbali ina, mphamvu ndi ductility ya kusungunula zimachepetsa kukula kwa thovu ndi kudziwa ngati thovu kuthyoka kapena kuphatikiza. Pamene mphamvu yowonjezera yakunja ya gasi imakhala yogwirizana ndi mphamvu ya viscoelastic yomwe imawonjezeka ndi kusungunuka chifukwa cha kuzizira, idzakhazikika ndikuwumbidwa nthawi yomweyo kuti ikhalebe ndi mawonekedwe a kuwira ndikuletsa kugwa kwa kuphulika. Mu zenizeni extrusion thobvu ndondomeko, chinthu chofunika kwambiri khalidwe la thovu mankhwala ndi kulamulira m'badwo ndi kukula kwa thovu kupanga ang'onoang'ono, yunifolomu ndi odziimira selo nyumba.
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