Taw qhia: Raws li ib qho ntawm cov yas siv dav dav, PP tuaj yeem pom txhua qhov chaw hauv lub neej txhua hnub. Nws muaj purity siab dua li qub pc. Txawm hais tias nws tsis muaj lub siab xim ntawm ABS, PP muaj ntau dua purity thiab xim rendering. Hauv kev lag luam, cov khoom siv PP feem ntau yog siv rau hauv cov khoom ntim xws lilub raj mis yas, lub raj mis caps, iav fwj, thiab lwm yam. Kuv tau txheeb los ntawmRB pobthiab koom nrog cov saw khoom siv rau kev siv:
Lub npe tshuaj: Polypropylene
Lub npe Askiv: Polypropylene (hu ua PP)
PP yog crystalline polymer. Ntawm cov khoom siv yas, PP yog lub teeb tshaj plaws, nrog qhov ceev ntawm tsuas yog 0.91g / cm3 (tsawg dua dej). Ntawm cov khoom siv dav dav, PP muaj qhov ua kom sov zoo tshaj plaws. Nws qhov kub distortion kub yog 80-100 ° C thiab tuaj yeem boiled hauv dej npau npau. PP muaj kev ntxhov siab zoo cracking tsis kam thiab siab khoov qaug zog lub neej. Nws yog feem ntau hu ua "100% yas". Kev ua tau zoo ntawm PP yog zoo dua li cov khoom siv PE. PP cov khoom muaj lub teeb yuag, zoo toughness thiab zoo tshuaj tiv thaiv.
Qhov tsis zoo ntawm PP: tsis tshua muaj qhov tseeb, tsis txaus rigidity, huab cua tsis zoo, yooj yim los tsim "tooj liab puas", nws muaj qhov tshwm sim tom qab shrinkage, tom qab demolding, nws yooj yim rau hnub nyoog, ua nkig, thiab yooj yim rau deform.
01
Moulding yam ntxwv
1) Cov khoom siv crystalline muaj hygroscopicity tsawg thiab nws yooj yim rau yaj tawg, thiab nws yog ib qho yooj yim rau decompose nyob rau hauv ntev kev sib cuag nrog kub hlau.
2) Lub fluidity yog zoo, tab sis lub shrinkage ntau thiab shrinkage tus nqi yog loj, thiab shrinkage qhov, dents, thiab deformation yog ib qho yooj yim mus tshwm sim.
3) Lub tshuab cua txias yog ceev ceev, lub tshuab pouring thiab lub tshuab cua txias yuav tsum maj mam dissipate cua sov, thiab xyuam xim rau kev tswj cov molding kub. Cov khoom siv kub yog yooj yim rau kev taw qhia ntawm qhov kub thiab txias. Thaum cov pwm kub qis dua 50 degrees, cov yas tsis yog du, thiab nws yog ib qho yooj yim los tsim cov vuam tsis zoo, ntws cov cim, Nws tuaj yeem ua rau warping thiab deformation saum 90 degrees.
4) Cov phab ntsa yas yuav tsum zoo ib yam kom tsis txhob muaj cov kua nplaum thiab cov kaum ntse ntse kom tsis txhob muaj kev ntxhov siab.
02
Cov yam ntxwv txheej txheem
PP muaj fluidity zoo ntawm melting kub thiab zoo molding kev ua tau zoo. PP muaj ob yam hauv kev ua haujlwm
Ib qho: Lub viscosity ntawm PP yaj txo qis nrog qhov nce ntawm shear npaum li cas (tsawg cuam tshuam los ntawm qhov kub thiab txias)
Thib ob: Lub degree ntawm molecular orientation yog siab thiab lub shrinkage tus nqi kuj siab.
Kev ua haujlwm kub ntawm PP yog nyob ib ncig ntawm 200-300 ℃. Nws muaj qhov zoo thermal stability (qhov kub decomposition yog 310 ℃), tab sis ntawm qhov kub siab (270-300 ℃), nws tuaj yeem degrade yog tias nws nyob hauv lub thoob rau lub sijhawm ntev. Vim tias qhov viscosity ntawm PP txo qis nrog qhov nce ntawm qhov nrawm, nce kev txhaj tshuaj thiab kev txhaj tshuaj nrawm yuav ua rau nws muaj dej ntau thiab txhim kho shrinkage deformation thiab kev nyuaj siab. Cov pwm kub yuav tsum tau tswj nyob rau hauv thaj tsam ntawm 30-50 ℃. PP yaj tuaj yeem dhau los ntawm qhov sib txawv ntawm qhov nqaim heev thiab tshwm rau pem hauv ntej. Nyob rau hauv lub melting txheej txheem ntawm PP, nws yuav tsum tau nqus ib tug loj npaum li cas ntawm tshav kub ntawm fusion (qhov loj dua qhov tshwj xeeb cua sov), thiab cov khoom yog kub dua tom qab raug tshem tawm ntawm pwm. PP cov ntaub ntawv tsis tas yuav tsum tau qhuav thaum lub sij hawm ua, thiab tus nqi shrinkage thiab crystallinity ntawm PP yog qis dua li ntawm PE.
03
Cov ntsiab lus yuav tsum nco ntsoov hauv kev ua cov yas
Kev ua yas
Pure PP yog translucent ivory dawb thiab tuaj yeem dyed hauv ntau xim. PP tuaj yeem tsuas yog dyed nrog cov xim masterbatch ntawm cov tshuab txhaj tshuaj molding, tab sis qee cov qauv muaj cov yas yas ywj pheej uas ntxiv dag zog rau kev sib xyaw ua ke, thiab lawv tuaj yeem ua rau dyed nrog toner.
Cov khoom siv sab nraum zoov feem ntau tau ntim nrog UV stabilizers thiab carbon dub. Kev siv cov khoom siv rov ua dua yuav tsum tsis pub tshaj 15%, txwv tsis pub nws yuav ua rau lub zog poob thiab decomposition thiab discoloration. Feem ntau, tsis muaj kev kho kom qhuav tshwj xeeb ua ntej kev txhaj tshuaj PP.
Txhaj tshuaj molding tshuab xaiv
Tsis muaj cov cai tshwj xeeb rau kev xaiv cov tshuab txhaj tshuaj molding. Vim tias PP muaj crystallinity siab. Lub tshuab computer txhaj tshuaj molding tshuab nrog kev txhaj tshuaj siab dua thiab kev tswj ntau theem yog xav tau. Lub clamping quab yuam feem ntau txiav txim siab los ntawm 3800t / m2, thiab qhov ntim ntim yog 20% -85%.
Pwm thiab rooj vag tsim
Cov pwm kub yog 50-90 ℃, thiab pwm kub kub yog siv rau qhov loj dua qhov yuav tsum tau ua. Qhov kub ntawm cov tub ntxhais yog ntau tshaj 5 ℃ qis dua qhov kub ntawm kab noj hniav, txoj kab uas hla yog 4-7 hli, rab koob qhov rooj ntev yog 1-1.5 hli, thiab txoj kab uas hla tuaj yeem me me li 0.7 hli.
Qhov ntev ntawm lub rooj vag ntug yog luv li sai tau, txog 0.7 hli, qhov tob yog ib nrab ntawm phab ntsa tuab, thiab qhov dav yog ob zaug ntawm phab ntsa tuab, thiab nws maj mam nce nrog qhov ntev ntawm cov yaj ntws hauv cov kab noj hniav.
Cov pwm yuav tsum muaj qhov cua zoo. Lub qhov taub yog 0.025mm-0.038mm tob thiab 1.5mm tuab. Txhawm rau kom tsis txhob muaj cov cim shrinkage, siv cov nozzles loj thiab puag ncig thiab lub voj voog khiav, thiab cov tuab ntawm cov tav yuav tsum me me (Piv txwv li, 50-60% ntawm phab ntsa tuab).
Lub thickness ntawm cov khoom ua los ntawm homopolymer PP yuav tsum tsis txhob ntau tshaj 3 hli, txwv tsis pub yuav muaj npuas (cov khoom phab ntsa tuab tsuas yog siv copolymer PP).
Melting kub
Lub melting point ntawm PP yog 160-175 ° C, thiab qhov decomposition kub yog 350 ° C, tab sis qhov kub thiab txias tsis tuaj yeem tshaj 275 ° C thaum txhaj tshuaj. Qhov kub nyob rau hauv lub melting seem yog nyiam dua 240 ° C.
Txhaj ceev
Txhawm rau txo qis kev ntxhov siab thiab deformation, kev txhaj tshuaj nrawm yuav tsum raug xaiv, tab sis qee qib ntawm PP thiab pwm tsis haum (npuas thiab cua kab hauv tib neeg mantle). Yog hais tias tus qauv nto tshwm nrog lub teeb thiab tsaus kab txaij diffused los ntawm lub rooj vag, kev txhaj tshuaj qis qis thiab kub pwm yuav tsum tau siv.
Melt rov qab siab
5bar yaj nplaum rov qab siab tuaj yeem siv tau, thiab rov qab siab ntawm cov khoom siv toner tuaj yeem hloov kho kom tsim nyog.
Txhaj thiab siab tuav
Siv kev txhaj tshuaj siab dua (1500-1800bar) thiab tuav lub siab (li 80% ntawm kev txhaj tshuaj siab). Hloov mus tuav lub siab ntawm li 95% ntawm tag nrho cov hlab ntsha tawg, thiab siv lub sijhawm tuav ntev dua.
Tom qab ua tiav cov khoom
Txhawm rau tiv thaiv qhov shrinkage thiab deformation tshwm sim los ntawm tom qab crystallization, cov khoom feem ntau yuav tsum tau soaked hauv dej kub.
Shanghai Rainbow Industrial Co., Ltdyog tus tsim khoom,Shanghai zaj sawv pobMuab ib-stop cosmetic ntim.Yog tias koj nyiam peb cov khoom, koj tuaj yeemtiv tauj peb,
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Post lub sij hawm: Oct-04-2021