Budurwa PLA resin, an yi crystallized kuma an bushe shi zuwa matakin danshi 400-ppm kafin barin shukar samarwa.PLA yana ɗaukar danshi na yanayi cikin sauri, yana iya ɗaukar kusan 2000 ppm danshi a yanayin buɗe ɗakin kuma yawancin matsalolin da aka samu akan PLA suna tasowa daga rashin isasshen bushewa.Ana buƙatar PLA a bushe da kyau kafin sarrafawa.Saboda shi polymer condensation ne, kasancewar ko da ɗan ƙaramin danshi yayin sarrafa narkewa yana haifar da lalacewar sarƙoƙi na polymer da asarar nauyin kwayoyin halitta da kaddarorin inji.PLA na buƙatar digiri daban-daban na bushewa dangane da sa da yadda za a yi amfani da shi.Ƙarƙashin 200 PPM ya fi kyau saboda danko zai zama mafi kwanciyar hankali kuma ya tabbatar da ingancin samfurin.
Kamar PET, ana isar da budurwa PLA pre-crystallized.Idan ba a yi crystallized ba, PLA zai zama m kuma zai yi dunƙule lokacin da zafinsa ya kai 60 ℃.Wannan shine zafin canjin gilashin PLA (Tg);wurin da kayan amorphous ya fara yin laushi.(Amorphous PET zai ƙara girma a 80 ℃) Rerind kayan da aka dawo dasu daga samarwa a cikin gida kamar datsa gefuna ko tarkacen kwarangwal ɗin thermoformed dole ne a yi crystalized kafin a iya sake sarrafa shi.Idan PLA crystallized ya shiga tsarin bushewa kuma an fallasa shi zuwa dumama sama da 140 F, zai yi girma kuma ya haifar da toshewar bala'i a cikin jirgin.Saboda haka, ana amfani da crystallizer don ba da damar PLA don canzawa ta hanyar Tg yayin da ake fuskantar tashin hankali.
Sannan PLA na buƙatar Dryer da crystallizer
1. Tsarin bushewa na al'ada --- na'urar bushewa (desiccant).
Amorphous maki amfani da zafi hatimin yadudduka a cikin fim an bushe a 60 ℃ na 4 hours.Crystallized maki da ake amfani da su extrude takardar da fim an bushe a 80 ℃ na 4 hours.Tsari tare da tsawon lokacin zama ko yanayin zafi mafi girma kamar kadin fiber yana buƙatar ƙarin bushewa, zuwa ƙasa da 50 PPM na danshi.
Bugu da kari, Infrared crystal dryer --- IR Dryer an nuna don yin crystallize Ingeo biopolymer yadda ya kamata yayin bushewa.Yin amfani da bushewar Infrared (IR).Saboda yawan canjin makamashi tare da dumama IR a hade tare da takamaiman tsayin igiyoyin da aka yi amfani da su, ana iya rage farashin makamashi sosai, tare da girman.Gwaji na farko ya nuna cewa budurwar Ingeo bioopolymer za a iya bushewa kuma a sanya flake amorphous crystallized kuma a bushe cikin kusan mintuna 15 kawai.
Infrared crystal bushewa --- ODE Design
1. Tare da sarrafa bushewa da crystallizing a lokaci guda
2. Lokacin bushewa shine 15-20mins (lokacin bushewa kuma zai iya zama daidaitacce azaman buƙatun abokan ciniki akan busassun kayan)
3. bushewa zafin jiki na iya zama daidaitacce (Range daga 0-500 ℃)
4. Danshi na ƙarshe: 30-50ppm
5. Kudin makamashi yana adana kusan 45-50% kwatanta da na'urar bushewa &crystallizer
6.Space tanadi: har zuwa 300%
7. Duk tsarin ana sarrafa Siemens PLC, sauƙin aiki
8. Mai saurin farawa
9. Saurin canzawa da lokacin rufewa
Aikace-aikacen PLA na al'ada (polylactic acid) sune
Fiber extrusion: jakunan shayi, tufafi.
Yin gyare-gyaren allura: kayan ado na kayan ado.
Haɗin: tare da itace, PMMA.
Thermoforming: clamshells, kuki trays, kofuna waɗanda, kofi kwafsa.
Busa gyare-gyare: kwalabe na ruwa (ba carbonated), ruwan 'ya'yan itace sabo, kwalabe na kwaskwarima.
Lokacin aikawa: Fabrairu-24-2022