Ndi kufalikira kosalekeza kwa kufunikira kwa mphamvu zatsopano, zikuyembekezeredwa kuti msika wa capacitor wa mafilimu ku China udzalowanso munthawi yokulirakulira kwambiri m'zaka zingapo zikubwerazi. Filimu ya polypropylene, yomwe ndi chinthu chachikulu cha ma capacitor a mafilimu, ikupitiliza kukulitsa kusiyana kwa kupezeka ndi kufunikira chifukwa cha kukulirakulira kwachangu kwa kufunikira komanso kutulutsidwa pang'onopang'ono kwa mphamvu zopangira. Nkhani ya sabata ino iwona zinthu zazikulu za ma capacitor a mafilimu - filimu ya polypropylene (filimu ya PP).

Kumapeto kwa zaka za m'ma 1960, filimu yamagetsi ya polypropylene inakhala imodzi mwa mafilimu atatu akuluakulu amagetsi chifukwa cha mawonekedwe ake apadera amagetsi ndi kukonza komanso mtengo wake wabwino kwambiri, ndipo idagwiritsidwa ntchito kwambiri mumakampani opanga ma capacitor amphamvu. Kumayambiriro kwa zaka za m'ma 1980, kupanga ma capacitor a polypropylene opangidwa ndi zitsulo kunali kutayamba kale m'maiko otukuka ku Europe ndi America, pomwe China inali ikadali mu gawo lopanga ma capacitor a polypropylene opangidwa ndi zitsulo. Kudzera mu kuyambitsa ukadaulo wopanga ma capacitor a polypropylene opangidwa ndi zitsulo ndi zida zazikulu, tidakhala ndi ma capacitor a polypropylene opangidwa ndi zitsulo m'lingaliro lenileni.

Tiyeni tidziwe bwino momwe filimu ya polypropylene imagwiritsidwira ntchito mu ma capacitor a mafilimu ndi mawu oyamba achidule. Ma capacitor a filimu ya polypropylene ndi a gulu la organic film capacitor, njira yake ndi polypropylene film, electrode ili ndi mtundu wa chitsulo chosungira ndi mtundu wa filimu yachitsulo, pakati pa capacitor imakulungidwa ndi epoxy resin kapena yophimbidwa mu pulasitiki ndi chikwama chachitsulo. Polypropylene capacitor yopangidwa ndi electrode ya filimu yachitsulo imatchedwa metallized polypropylene film capacitor, yomwe imadziwika kuti film capacitor. Polypropylene film ndi thermoplastic resin yopangidwa ndi polymerizing propylene. Nthawi zambiri imakhala yokhuthala, yolimba, ndipo imakhala ndi mphamvu yokoka kwambiri, ndipo ingagwiritsidwe ntchito pa mafilimu obiriwira, matumba onyamula katundu, ndi zina zotero. Polypropylene ndi polymer yopanda poizoni, yopanda fungo, yopanda kukoma, yoyera ngati mkaka, yokhala ndi makristalo ambiri yokhala ndi kachulukidwe ka 0.90-0.91g/cm³ yokha. Ndi imodzi mwa mitundu yopepuka kwambiri ya mapulasitiki onse omwe alipo. Ndi yokhazikika kwambiri ku madzi, kuchuluka kwa madzi m'madzi ndi 0.01% yokha, kulemera kwa mamolekyu pafupifupi 80,000-150,000.

Filimu ya polypropylene ndiye chinthu chachikulu cha ma capacitor a filimu. Njira yopangira ma capacitor a filimu imatchedwa filimu yachitsulo, yomwe imapangidwa ndi vacuum vaporizing wosanjikiza woonda wa chitsulo pa filimu ya pulasitiki ngati electrode. Izi zitha kuchepetsa kuchuluka kwa mphamvu ya capacitor unit, kotero filimuyo ndi yosavuta kupanga ma capacitor ang'onoang'ono, okhala ndi mphamvu zambiri. Kumtunda kwa capacitor ya filimu kumaphatikizapo filimu yoyambira, zojambula zachitsulo, waya, ma phukusi akunja, ndi zina zotero. Pakati pawo, filimu yoyambira ndiye chinthu chachikulu, ndipo kusiyana kwa zinthuzo kumapangitsa ma capacitor a filimu kuwonetsa magwiridwe antchito osiyanasiyana. Filimu yoyambira nthawi zambiri imagawidwa mu polypropylene ndi polyester. Filimu yoyambira ikakula, mphamvu imatha kupirira, ndipo mosemphanitsa, mphamvu imatha kupirira. Filimu yoyambira ndi filimu yamagetsi yamagetsi, chifukwa dielectric ya ma capacitor a filimu ndiye chinthu chofunikira kwambiri chapamwamba, chomwe chimatsimikiza magwiridwe antchito a ma capacitor a filimu ndipo chimatenga 60%-70% ya mtengo wazinthuzo. Ponena za momwe msika ulili, opanga aku Japan ali ndi mbiri yabwino pakupanga zinthu zopangira ma capacitor apamwamba kwambiri, ndipo Toray, Mitsubishi ndi DuPont ndi omwe amapereka mafilimu apamwamba kwambiri padziko lonse lapansi.

Makanema amagetsi a polypropylene a magalimoto atsopano amphamvu, photovoltaic ndi mphamvu ya mphepo amakhala pakati pa ma microns awiri ndi anayi, ndipo mphamvu yopanga yachepetsedwa ndi theka munthawi yomweyo poyerekeza ndi ma microns 6 mpaka 8 a zida wamba zapakhomo, zomwe zapangitsa kuti kupanga konse kuchepe kwambiri komanso kusintha kwa msika ndi kufunikira. Kupereka kwa filimu yamagetsi ya polypropylene kudzakhala kochepa m'zaka zikubwerazi. Pakadali pano, zida zazikulu za filimu yamagetsi ya polypropylene yapadziko lonse lapansi zimapangidwa ku Germany, Japan ndi mayiko ena, ndipo nthawi yomanga mphamvu yatsopano ndi miyezi 24 mpaka 40. Kuphatikiza apo, zofunikira pakugwira ntchito kwa mafilimu atsopano amphamvu zamagalimoto ndizokwera, ndipo makampani ochepa okha ndi omwe amatha kukhazikika pakupanga mafilimu atsopano amagetsi a polypropylene, kotero padziko lonse lapansi, sipadzakhala mphamvu yatsopano yopanga mafilimu a polypropylene mu 2022. Ndalama zina pakupanga zikukambidwa. Chifukwa chake, pakhoza kukhala kusiyana kwakukulu kwa mphamvu kwa makampani onse chaka chamawa.