Njira Yopanga Mapepala a PET

Zopangira za PET pepala #pet sheet extrusion

Mapepala a PET, monga mapulasitiki ena, ntchitoyo imagwirizana kwambiri ndi kulemera kwa maselo, ndipo mawonekedwe a viscosity amatsimikizira kulemera kwa maselo. Kuchuluka kwa kukhuthala kwamkati, kumapangitsa kuti thupi likhale labwino komanso lamankhwala. koma kusauka kwamadzi, kumabweretsa zovuta kuumba. Kutsika kwa kukhuthala kwamkati ndiko, kuipiraipira kwa physicochemical properties ndi mphamvu yamphamvu. Choncho, 0.8dl/ G-0.9dL/g ayenera kusankhidwa kwa khalidwe mamasukidwe akayendedwe a PET mandala filimu.

PET kupanga njira #extrusora de garrafa pet

Zida zazikulu zopangira pepala lowonekera la PET ndi: nsanja ya crystallization, nsanja yowumitsa, extruder, mutu wa nkhungu, kalendala yama roll atatu ndi coiler.

Njira yopangirayi ili motere: crystallization zopangira → kuyanika → extrusion plasticizing → extrusion molding → calendering molding → zomangira zopangira.

Gawo loyamba ndi crystallization. Magawo a PET amatenthedwa ndikuwunikiridwa munsanja ya crystallization, kotero kuti mamolekyu amakonzedwa bwino, ndiyeno kutentha kwa magalasi kwa magawowo kumakwezedwa, komwe cholinga chake ndi kuteteza kumamatira panthawi yowumitsa ndikutsekereza hopper. Crystallization nthawi zambiri ndi gawo lofunikira, kutenga mphindi 30 mpaka mphindi 90, ndipo kutentha kumakhala kosakwana 149 ° C.

Khwerero 0.005, youma. Chifukwa cha kuwonongeka kwa hydrolytic kwa PET komwe kumachitika chifukwa cha madzi pansi pa kutentha kwambiri, kumatira kwake kumachepetsedwa, ndipo mawonekedwe ake, makamaka mphamvu yamphamvu, adzachepetsedwa ndikuchepetsa kulemera kwa maselo. Choncho, PET iyenera kuumitsidwa isanayambe kusungunuka ndi kutuluka kuti ichepetse chinyezi, ndipo chinyezi chiyenera kukhala chocheperapo 40%. Chifukwa cha hygroscopic yazinthu za PET, madzi akuya pamwamba pa kagawoyo amapanga zomangira zama cell, ndipo madzi ena amakhala mkati mwa kagawo, zomwe zimapangitsa kuti kuyanika kukhale kovuta, kotero kuti mpweya wotentha sungagwiritsidwe ntchito. Mame a mpweya wotentha amafunika kukhala pansi pa -XNUMX ° C, ndipo mpweya wotentha umadutsa pamtunda wotsekedwa kupita ku chowumitsa chowumitsa kuti chiwume mosalekeza. # pe extruder makina.

Zithunzi zomwe zaperekedwa zikuchokera kufakitale yamakasitomala a JWELL Turkey mu Seputembala. Atabereka kuchokera ku fakitale ya Jwell kupita ku fatory ya kasitomala waku Turkey, injiniya wa Jwell adapita kufakitale kukayika makina a PET sheet extrusion pakuyika kwa thermoforming. #rpet pulasitiki yobwezeretsanso

Gawo lachitatu ndikuumba extrusion. PET imasinthidwa kukhala polima yokhala ndi malo osungunuka owoneka bwino pambuyo pa crystallization ndi kuyanika, ndipo kutentha kwa polima kumakhala kokwera komanso kuwongolera kutentha kumakhala kocheperako. The unmelted particles amasiyanitsidwa ndi kusungunula ntchito chotchinga wononga makamaka lakonzedwa poliyesitala, amene amathandiza kukhala yaitali akumeta ubweya ndondomeko ndi kuonjezera linanena bungwe extruder a. Mutu wofewa wa milomo wofewa wokhala ndi ndodo yoyimitsa mzere umagwiritsidwa ntchito, mutu ndi wowoneka bwino, njira yowongoka komanso milomo yopanda zingwe ikuwonetsa kuti pepala liyenera kukhala labwino, chotenthetsera chamutu chimakhala ndi ntchito yokhetsa ndi kuyeretsa, mutu kufa mlomo kusiyana ayenera kuonetsetsa chifanane, mutu kufa milomo kusiyana chifanane mwachindunji zimakhudza yopingasa makulidwe kupatuka kwa pepala ndi flatness wa calendering. Kutentha kofanana ndi malo akutsogolo, dera lapakati la fuselage, kumbuyo kwa fuselage, kusintha kwa ukonde ndi mutu ndi 240 ° C-260 ° C, 265 ° C-275 ° C, 260 ° C- 265°C, 260°C-265°C, 255°C-265°C. #makina opangira mapepala

Khwerero 8: Kuzizira ndikukhazikitsa. Pambuyo pa kusungunula kumatuluka pamutu mwachindunji mu kalendala ya mipukutu itatu ya kalendala ndi kuziziritsa, mtunda wapakati pa kalendala ya mipukutu itatu ndi mutu nthawi zambiri umasungidwa pafupifupi 40cm, chifukwa ngati mtunda uli waukulu kwambiri, pepala ndi losavuta. makwinya ndi makwinya, zomwe zimapangitsa kuti masamba asamalire bwino. Kuonjezera apo, chifukwa cha mtunda wochuluka, kuziziritsa kutentha kwa kutentha kumakhala pang'onopang'ono ndipo crystallization ndi yoyera, yomwe siikugwirizana ndi calendering. Magawo atatu odzigudubuza a calendering amapangidwa ndi odzigudubuza atatu apamwamba, apakati ndi apansi, mzere wapakati wodzigudubuza umakhala wokhazikika, ndipo mzere wa ma roller awiri apamwamba ndi otsika amatha kusunthira mmwamba ndi pansi pamene kutentha kwa mpukutuwo ndi 50 ° C. -30 ° C panthawi yozizira ya kalendala. Posunthira mmwamba ndi pansi pa olamulira kuti musinthe kusiyana kwa mpukutuwo, kutentha kwa odzigudubuza awiri apamwamba ndi otsika ndi 60 ° C-52 ° C, 68 ° C-100 ° C, motero, odzigudubuza atatu ayenera kuonetsetsa kuti liwiro likuyenda. synchronized, liwiro ayenera kukhala pamwamba pa liwiro extrusion, cholinga ndi kuthetsa kukulitsa zinthu kusiya kufa ndi kufooketsa nkhawa mkati mwa pepala, kuti makwinya kutha. PET idzatulutsa crystallization mu 250 ° C mpaka 140 ° C, ndipo mlingo wa crystallization ndi 180 ° C mpaka XNUMX ° C pamene uli mofulumira, kotero crystallization ikhoza kumalizidwa mumasekondi angapo. PET imayenera kudutsa mwachangu m'derali kutentha kwa crystallization ndikuwongolera kutentha kwa ma roll atatu.

Khwerero 5: Kokani ndikusintha. Tsambalo limatuluka kudzera mu chodzigudubuza cha kalendala ndikulowa mu chipangizo chokokera kudzera pa chowongolera. Chipangizo chokokera chimapangidwa ndi mphira wodzigudubuza wokhazikika komanso wodzigudubuza wa rabara, ndipo kukakamiza kwa ma roller awiri kumateteza pepala kuti lisaphwanyike pamene pepala limakokedwa ndi odzigudubuza awiri ku chipangizo chomangirira.