1.Polypropylene - PP
Extrusion kub: Dav ntau yam, kwv yees li 190-250 degree. Nws muaj qhov sib txawv ntawm qhov sib txawv tab sis tus nqi siab enthalpy, yuav tsum muaj cov yas txaus thiab lub peev xwm txias.
Qhuav lub zog thiab sagging: Tsawg yaj lub zog yog ib qho ntawm cov teeb meem loj tshaj plaws nyob rau hauv extrusion ntawm PP nplooj ntawv (tshwj xeeb tshaj yog homopolymer PP). Ntawm qhov tuag tawm, daim ntawv yog sagging nyob rau hauv nws tus kheej qhov hnyav, uas impairs thickness uniformity. Lub siab yaj lub zog PP (HMSPP) lossis copolymer PP yog qhov kev xaiv zoo dua.
Crystallinity thiab txias: Raws li crystalline polymer, qhov cua txias thiab qhov kub thiab txias (tshwj xeeb tshaj yog lub calender yob kub) ua rau muaj kev cuam tshuam loj rau crystallinity, pob tshab thiab tom qab-shrinkage tus nqi. Yuav tsum muaj kev tswj hwm gradient txias system.
Hygroscopy: Tsawg heev; ziab yog feem ntau tsis tsim nyog (tshwj tsis yog muab cia rau hauv qhov chaw ntub dej heev).
Shrinkage tus nqi: Relatively siab (1.0-2.5%), yuav tsum tau ua tib zoo saib xyuas qhov seem stability ntawm cov khoom tiav.
Cov yam ntxwv tseem ceeb / Cov Kev Sib Tw: Lub Zog: Lub teeb yuag, cov tshuaj tiv thaiv zoo heev, microwaveable, thiab tus nqi siab -effectiveness.Challenges: Tswj sagging thiab ntug warpage; Kev ua tiav siab pob tshab yuav tsum tau quenching cov txheej txheem thiab cov tso tsheb hlau luam dej, ua rau kev tsim khoom nyuaj dua li ntawm PS.
2. Polystyrene - PS
Extrusion kub: Kwv yees li 180-230 degree. Muaj qhov sib txawv me ntsis ntawm GPPS thiab HIPS; Kev ua haujlwm kub ntawm HIPS feem ntau yog qis dua vim nws cov roj hmab tivthaiv.
Qhuav lub zog thiab sagging: Zoo yaj lub zog, tshwj xeeb tshaj yog pom nyob rau hauv GPPS. Daim ntawv tseem tawv thaum kos tawm ntawm qhov tuag nrog tsawg sagging, ua kom yooj yim traction thiab shaping.
Crystallinity thiab txias: Ib qho amorphous polymer uas tsis muaj crystalline hloov pauv. Cov txheej txheem cua txias feem ntau yog hloov pauv iav, nrog tus nqi qis heev (kwv yees li 0.4-0.7%) thiab qhov zoo ntawm qhov ntev. Kev tswj kub ntawm calender yob yog hloov tau yooj yim.
Hygroscopy: Tsawg, thiab ua ntej- ziab yog qhov tsis tsim nyog.
Cov yam ntxwv tseem ceeb / Cov Kev Sib Tw: Lub Zog: GPPS nta zoo tshaj plaws optical transparency, siab rigidity thiab zoo printability; HIPS muaj kev cuam tshuam zoo. Nws muaj qhov ua haujlwm dav dav thiab yog ib qho ntawm cov ntaub ntawv yooj yim tshaj plaws rau extrude.
Kev sib tw: GPPS yog nkig heev; Qhov gloss ntawm HIPS feem ntau yog qis dua li ntawm GPPS; nws cov cua sov thiab roj kuj yog nruab nrab.
3. Polyethylene Terephthalate - PET (APET)
Extrusion kub: Zoo heev, kwv yees li 260-290 degree. Nws yog rhiab heev rau qhov kub thiab txias thiab yuav tsum tau tswj kom meej.
Qhuav lub zog thiab sagging: Melt lub zog yog nruab nrab, tab sis yaj viscosity yog heev rhiab heev rau kub thiab noo noo. Sagging tswj yog yooj yim dua li ntawm PP tab sis nyuaj dua li ntawm PS.
Crystallinity thiab txias: Lub crystallization tus nqi kuj qeeb. High-pob tshab, amorphous APET nplooj ntawv tuaj yeem tsim los ntawm kev ua kom txias sai (siv lub tank dej txias). Tsis txaus cua txias yuav ua rau ntxov ntxov crystallization, ua rau muaj kev nce hauv haze thiab embrittlement.
Hygroscopy: siab heev! PET yog qhov cuam tshuam rau hydrolytic degradation hauv lub xeev molten, uas ua rau txo qis hauv molecular hnyav thiab poob ntawm lub zog. Lub tshuab dehumidifying yuav tsum tau siv los tswj cov dej noo ntawm cov ntaub ntawv raw hauv qab 50ppm (0.005%)-qhov no yog lub neej ntawm PET extrusion.
Cov yam ntxwv tseem ceeb / Cov Kev Sib Tw: Lub Zog: Cov pob tshab zoo heev, gloss, rigidity thiab barrier zog (tshwj xeeb tshaj yog rau cov pa oxygen thiab carbon dioxide).
Cov kev sib tw: Cov kev cai nruj rau cov khoom siv raw kom qhuav thiab tu cov khoom siv; khoom siv yuav tsum yog corrosion-resistant (vim acetic acid los ntawm- khoom); nyuaj heev nyob rau hauv recycling thiab reprocessing cov ntaub ntawv pov tseg.
4. Polyvinyl Chloride - PVC (Rigid)
Extrusion kub: qis qis, kwv yees li 160-190 degree. Nws muaj qhov tsis zoo thermal stability, xav tau kev tswj xyuas meej ntawm lub sijhawm nyob thiab qhov kub thiab txias.
Melt zog thiab sagging: nta zoo yaj lub zog thiab yooj yim formability. Txawm li cas los xij, cov yaj muaj qhov pom tseeb elasticity thiab tseem ceeb tuag swell, uas yuav tsum muaj qhov tsim nyog tuag daim di ncauj rau kev them nyiaj.
Thermal stability: Qhov kev sib tw loj tshaj plaws. PVC decomposes thiab tso tawm HCl roj ntawm kev ua haujlwm kub, uas muaj cov nyhuv autocatalytic. Thaum tshav kub kub stabilizers yuav tsum tau ntxiv, thiab cov cuab yeej ntsia hlau, chim thiab tuag yuav tsum tau ua los ntawm corrosion{2}}cov alloys resistant (xws li, bimetallic chim).
Txias: Raws li cov khoom siv amorphous, nws qhov txias yog qhov yooj yim. Txawm li cas los xij, vim nws cov thermal conductivity tsawg, yuav tsum muaj qhov ua kom txias zoo.
Cov yam ntxwv tseem ceeb / Cov Kev Sib Tw: Lub Zog: Siab hardness, nplaim hluav taws zoo, huab cua tsis zoo, thiab hloov tau yooj yim ntawm kev tsim.
Cov kev sib tw: cov qauv tsim (xws li stabilizers, lubricants, modifiers, thiab lwm yam); corrosive rau cov khoom siv; thiab ntxiv kev nruj me ntsis ntawm ib puag ncig thiab kev noj qab haus huv cov cai.
5. Acrylonitrile-Butadiene-Styrene Copolymer - ABS
Extrusion kub: Kwv yees li 200-240 degree. Kev kub siab heev yuav ua rau cov roj hmab degradation thiab tsis muaj zog toughness.
Melt zog thiab sagging: Zoo yaj lub zog nrog tswj sagging.
Hygroscopy: Zoo heev. Txawm hais tias tsis zoo li PET, noo noo tuaj yeem ua rau npuas lossis crazes ntawm daim ntawv. Qhuav ntawm ib ncig ntawm 80℃rau 2-4 teev feem ntau yuav tsum tau.
Txias thiab shrinkage: Cov khoom siv amorphous nrog tus nqi qis qis (kwv yees li 0.4-0.9%). Txawm li cas los xij, vim nws qhov kub hloov pauv iav siab, lub calender yob kub yuav tsum tau teeb tsa siab kom tsis txhob muaj kev ntxhov siab tawg ntawm daim ntawv.
Cov yam ntxwv tseem ceeb / Cov Kev Sib Tw: Lub Zog: Zoo heev sib npaug ntawm toughness, deg hardness, gloss thiab processability.
Cov kev sib tw: cov nqi raw khoom zoo heev; nruab nrab tsis kam mus rau ultraviolet rays thiab ntev - huab cua (xws li yuav tsum tau ntxiv); Cov kev xav tau siab heev rau kev ua tiav ntawm calender yob thaum nrhiav qhov siab -gloss nto.