Mzere Wowonjezera Mapepala a PET/PLA

Polylactic acid (PLA) imatha kusungunuka kwathunthu kukhala carbon dioxide ndi madzi pansi pa mikhalidwe yachilengedwe itatayidwa. Ili ndi kukana madzi bwino, mphamvu zake, imagwirizana ndi zamoyo, imatha kuyamwa ndi zamoyo, ndipo ilibe kuipitsa chilengedwe. Nthawi yomweyo, PLA ilinso ndi mphamvu zake. Ili ndi mphamvu yayikulu, kusinthasintha bwino komanso kukhazikika kwa kutentha, pulasitiki, kusinthasintha, kusinthasintha mtundu, kulola mpweya ndi nthunzi ya madzi kulowa bwino, komanso kuwonekera bwino, kukana chimfine, kupha mabakiteriya, nthawi yogwira ntchito ndi zaka 2 mpaka 3.

Chizindikiro chofunikira kwambiri cha magwiridwe antchito a zinthu zopakira ndi mpweya wokwanira, ndipo gawo logwiritsira ntchito la zinthuzi mu phukusi likhoza kudziwika malinga ndi kusiyana kwa mpweya wokwanira wa zinthuzo. Zipangizo zina zopakira zimafuna mpweya wokwanira kuti zipereke mpweya wokwanira ku chinthucho; zipangizo zina zopakira zimafuna cholepheretsa mpweya pankhani ya zinthu, monga kuyika zakumwa, zomwe zimafuna zinthu zomwe zingalepheretse mpweya kulowa mu phukusi kuti zilepheretse kukula kwa nkhungu. PLA ili ndi chotchinga cha mpweya, chotchinga cha madzi, chowonekera bwino komanso chosindikizidwa bwino.

PLA ili ndi mawonekedwe abwino komanso kuwala, ndipo magwiridwe ake abwino kwambiri ndi ofanana ndi cellophane ndi PET, zomwe sizipezeka m'mapulasitiki ena owonongeka. Kuwonekera bwino ndi kuwala kwa PLA ndi kuwirikiza kawiri mpaka katatu kuposa filimu wamba ya PP ndi kuwirikiza ka khumi kuposa LDPE. Kuwonekera kwake kwakukulu kumapangitsa kuti PLA iwoneke ngati chinthu chokongoletsera. Mwachitsanzo, imagwiritsidwa ntchito popaka maswiti. Pakadali pano, mapaki ambiri a maswiti pamsika amagwiritsa ntchito mafilimu opaka maswiti a PLA.

Mawonekedwe ndi magwiridwe antchito a filimuyi yopaka maswiti ndi ofanana ndi mafilimu achikhalidwe opaka maswiti, okhala ndi mawonekedwe owonekera bwino, kusunga bwino kink, kusindikiza komanso mphamvu, komanso mawonekedwe abwino kwambiri otchinga, omwe amatha kusunga kukoma kwa maswiti. Kampani ina yaku Japan imagwiritsa ntchito mtundu wa "racea" PLA wa American Cakir Dow Polymer Company ngati zinthu zopangira zinthu zatsopano, ndipo maphukusi ake ndi owonekera kwambiri. Toray Industries yapanga mafilimu ndi zidutswa za PLA pogwiritsa ntchito ukadaulo wake wapadera wa nano-alloy. Filimuyi ili ndi kukana kutentha ndi kukhudza komweko monga mafilimu opangidwa ndi mafuta, komanso ili ndi kusinthasintha komanso kuwonekera bwino.

PLA ikhoza kupangidwa kukhala zinthu zopangidwa ndi filimu zomwe zimaonekera bwino, zimakhala ndi zotchinga zabwino, zimatha kukonzedwa bwino komanso zimakhala ndi makina, ndipo zingagwiritsidwe ntchito pokonza zipatso ndi ndiwo zamasamba mosavuta. Imatha kupanga malo oyenera osungira zipatso ndi ndiwo zamasamba, kusunga moyo wa zipatso ndi ndiwo zamasamba, kuchedwetsa kukalamba, komanso kusunga mtundu, fungo, kukoma ndi mawonekedwe a zipatso ndi ndiwo zamasamba. Komabe, ikagwiritsidwa ntchito pazinthu zenizeni zokonzera chakudya, kusintha kwina kumafunika kuti igwirizane ndi mawonekedwe a chakudyacho, kuti pakhale zotsatira zabwino zokonzera chakudya.

PLA ikhoza kupanga malo okhala ndi asidi pang'ono pamwamba pa chinthucho, chomwe chili ndi maziko a mabakiteriya ndi bowa. Ngati mankhwala ena ophera tizilombo agwiritsidwanso ntchito, kuchuluka kwa mabakiteriya opitilira 90% kumatha kupezeka, komwe kungagwiritsidwe ntchito popaka mankhwala ophera tizilombo.

Poyerekeza ndi filimu ya LDPE, filimu ya PLA ndi filimu ya PLA/REO/TiO2, mphamvu ya madzi yolowera mu filimu ya PLA/REO/Ag ndi yayikulu kwambiri kuposa mafilimu ena. Izi zatsimikizira kuti imatha kuletsa bwino mapangidwe a madzi oundana ndikupangitsa kuti tizilombo toyambitsa matenda tizitha kukula; nthawi yomweyo, ilinso ndi mphamvu yabwino kwambiri yolimbana ndi bakiteriya.

Mzere wotulutsira mapepala a PET/PLA: JWELL imapanga mzere wotulutsira mapepala awiri ofanana a pepala la PET/PLA, mzerewu uli ndi makina ochotsera mpweya, ndipo palibe chifukwa chowumitsa ndi kupangira makristalo. Mzere wotulutsira uli ndi mphamvu zochepa zogwiritsira ntchito mphamvu, njira yosavuta yopangira komanso kukonza kosavuta. Kapangidwe ka screw kogawanika kangachepetse kutayika kwa viscosity kwa resin ya PET/PLA, chozungulira cha symmetrical ndi thin-wall calender chimawonjezera mphamvu yozizira ndikukweza mphamvu ndi mtundu wa pepala. Chodyetsa cha dosing cha zigawo zambiri chimatha kuwongolera kuchuluka kwa zinthu zomwe sizinali za virgin, zinthu zobwezeretsanso ndi master batch molondola, pepalali limagwiritsidwa ntchito kwambiri pamakampani opanga ma thermoforming.