Kev Taw Qhia: Raws li ib qho ntawm cov yas dav dav siv dav dav, PP tuaj yeem pom txhua qhov chaw hauv lub neej txhua hnub. Nws muaj kev ntshiab siab dua li PC ib txwm muaj. Txawm hais tias nws tsis muaj xim siab ntawm ABS, PP muaj kev ntshiab siab dua thiab xim rendering. Hauv kev lag luam, cov khoom siv PP feem ntau siv rau hauv cov ntaub ntawv ntim khoom xws lilub raj mis yas, lub hau fwj, lub raj mis tshuaj pleev ib ce, thiab lwm yam. Kuv raug txheeb xyuas los ntawmRB PACKAGEthiab qhia rau cov khoom siv rau kev siv ua piv txwv:
Lub npe tshuaj: Polypropylene
Lub npe lus Askiv: Polypropylene (hu ua PP)
PP yog ib hom polymer crystalline. Ntawm cov yas uas siv ntau, PP yog lub sib dua tshaj plaws, nrog qhov ceev tsuas yog 0.91g/cm3 (tsawg dua dej). Ntawm cov yas dav dav, PP muaj qhov tiv taus cua sov zoo tshaj plaws. Nws qhov kub hloov pauv cua sov yog 80-100 ° C thiab tuaj yeem ua kom npau hauv dej npau. PP muaj kev tiv taus kev ntxhov siab zoo thiab lub neej khoov siab. Nws feem ntau hu ua "100% yas". Kev ua tau zoo ntawm PP zoo dua li cov khoom siv PE. Cov khoom PP muaj qhov hnyav sib dua, tawv zoo thiab tiv taus tshuaj lom neeg zoo.
Qhov tsis zoo ntawm PP: qhov tseeb ntawm qhov ntev tsis zoo, tsis muaj zog txaus, tsis tiv taus huab cua, yooj yim tsim "kev puas tsuaj los ntawm tooj liab", nws muaj qhov tshwm sim tom qab ntsws, tom qab demolding, nws yooj yim laus, ua brittle, thiab yooj yim deform.
01
Cov yam ntxwv ntawm molding
1) Cov khoom siv crystalline muaj hygroscopicity qis thiab yooj yim rau yaj tawg, thiab nws yooj yim rau decompose hauv kev sib cuag ntev nrog cov hlau kub.
2) Qhov fluidity zoo, tab sis qhov ntau thiab tsawg ntawm shrinkage thiab shrinkage tus nqi loj, thiab qhov shrinkage, dents, thiab deformation yooj yim tshwm sim.
3) Qhov txias ceev ceev, lub kaw lus nchuav thiab lub kaw lus txias yuav tsum maj mam tso cua sov tawm, thiab xyuam xim rau kev tswj qhov kub ntawm lub pwm. Qhov kub ntawm cov khoom siv yooj yim rau kev taw qhia ntawm qhov kub qis thiab siab. Thaum qhov kub ntawm lub pwm qis dua 50 degrees, qhov chaw yas tsis du, thiab nws yooj yim los tsim cov vuam tsis zoo, cov cim ntws, yooj yim rau kev warping thiab deformation saum 90 degrees.
4) Lub phab ntsa yas tuab yuav tsum sib xws kom tsis txhob muaj kua nplaum thiab cov ces kaum ntse kom tiv thaiv kev ntxhov siab.
02
Cov yam ntxwv ntawm cov txheej txheem
PP muaj cov kua dej zoo thaum lub sijhawm yaj thiab kev ua haujlwm zoo ntawm kev txhaj tshuaj. PP muaj ob yam ntxwv hauv kev ua tiav
Ib: Qhov viscosity ntawm PP yaj txo qis ntau nrog rau qhov nce ntawm shear rate (tsawg dua cuam tshuam los ntawm qhov kub thiab txias)
Qhov thib ob: Qhov degree ntawm molecular orientation siab thiab qhov shrinkage tus nqi yog qhov siab.
Qhov kub ntawm PP ua haujlwm yog li ntawm 200-300 ℃. Nws muaj kev ruaj khov zoo (qhov kub ntawm kev lwj yog 310 ℃), tab sis thaum kub siab (270-300 ℃), nws yuav lwj yog tias nws nyob hauv lub thoob ntev. Vim tias qhov viscosity ntawm PP txo qis ntau nrog rau qhov nce ntawm qhov ceev ntawm shear, kev nce ntawm kev txhaj tshuaj thiab qhov ceev ntawm kev txhaj tshuaj yuav ua rau nws cov kua dej ntau ntxiv thiab txhim kho kev hloov pauv thiab kev nyuaj siab ntawm lub cev. Qhov kub ntawm pwm yuav tsum tau tswj hwm hauv qhov ntau ntawm 30-50 ℃. PP yaj tuaj yeem hla dhau qhov sib txawv ntawm pwm nqaim heev thiab tshwm sim pem hauv ntej. Hauv cov txheej txheem yaj ntawm PP, nws yuav tsum nqus tau ntau qhov kub ntawm kev sib xyaw (qhov kub tshwj xeeb loj dua), thiab cov khoom kub dua tom qab raug rho tawm ntawm pwm. Cov khoom PP tsis tas yuav qhuav thaum lub sijhawm ua haujlwm, thiab qhov nrawm ntawm kev lwj thiab crystallinity ntawm PP qis dua li ntawm PE.
03
Cov ntsiab lus yuav tsum nco ntsoov hauv kev ua cov yas
Kev ua yas
PP ntshiab yog xim dawb pob tshab thiab tuaj yeem zas xim rau ntau yam xim. PP tsuas yog tuaj yeem zas xim nrog cov xim masterbatch ntawm cov tshuab txhaj tshuaj molding dav dav, tab sis qee cov qauv muaj cov khoom yas ywj pheej uas ua kom muaj zog rau kev sib xyaw, thiab lawv kuj tuaj yeem zas xim nrog toner.
Cov khoom siv sab nraum zoov feem ntau yog ntim nrog UV stabilizers thiab carbon dub. Qhov piv ntawm kev siv cov khoom siv rov ua dua tshiab yuav tsum tsis pub tshaj 15%, txwv tsis pub nws yuav ua rau lub zog poob thiab lwj thiab hloov pauv. Feem ntau, tsis tas yuav tsum tau kho kom qhuav tshwj xeeb ua ntej ua PP txhaj tshuaj.
Kev xaiv tshuab txhaj tshuaj molding
Tsis muaj qhov yuav tsum tau tshwj xeeb rau kev xaiv cov tshuab txhaj tshuaj molding. Vim tias PP muaj crystallinity siab. Yuav tsum muaj lub tshuab txhaj tshuaj molding computer nrog lub siab txhaj tshuaj siab dua thiab kev tswj ntau theem. Lub zog clamping feem ntau yog txiav txim siab los ntawm 3800t / m2, thiab qhov ntim txhaj tshuaj yog 20% -85%.
Tsim pwm thiab rooj vag
Qhov kub ntawm pwm yog 50-90 ℃, thiab qhov kub ntawm pwm siab yog siv rau qhov xav tau loj dua. Qhov kub ntawm lub plawv qis dua 5 ℃ dua li qhov kub ntawm qhov kab noj hniav, txoj kab uas hla ntawm tus khiav yog 4-7 hli, qhov ntev ntawm lub qhov rooj koob yog 1-1.5 hli, thiab txoj kab uas hla tuaj yeem me li 0.7 hli.
Qhov ntev ntawm lub rooj vag ntug yog luv li sai tau, kwv yees li 0.7 hli, qhov tob yog ib nrab ntawm cov phab ntsa tuab, thiab qhov dav yog ob npaug ntawm cov phab ntsa tuab, thiab nws maj mam nce nrog qhov ntev ntawm cov dej ntws hauv qhov.
Cov pwm yuav tsum muaj qhov cua zoo. Lub qhov cua yog 0.025mm-0.038mm tob thiab 1.5mm tuab. Txhawm rau kom tsis txhob muaj cov cim ntsws, siv cov nozzles loj thiab puag ncig thiab cov khiav ncig, thiab qhov 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 pub tshaj 3 hli, txwv tsis pub yuav muaj npuas (cov khoom phab ntsa tuab tsuas yog siv tau copolymer PP).
Kub yaj
Lub ntsiab lus yaj ntawm PP yog 160-175 ° C, thiab qhov kub ntawm kev lwj yog 350 ° C, tab sis qhov chaw kub tsis tuaj yeem tshaj 275 ° C thaum lub sijhawm txhaj tshuaj. Qhov kub hauv seem yaj yog qhov zoo dua 240 ° C.
Kev txhaj tshuaj ceev
Yuav kom txo tau kev ntxhov siab sab hauv thiab kev hloov pauv, yuav tsum xaiv kev txhaj tshuaj ceev ceev, tab sis qee qib ntawm PP thiab pwm tsis haum (npuas thiab cov kab cua hauv tib neeg lub mantle). Yog tias qhov chaw patterned tshwm sim nrog cov kab teeb thiab tsaus nti diffused los ntawm lub rooj vag, kev txhaj tshuaj ceev qis thiab qhov kub pwm siab dua yuav tsum tau siv.
Yaj rov qab siab
Siv tau 5bar yaj nplaum rov qab siab, thiab lub siab rov qab ntawm cov khoom siv toner tuaj yeem hloov kho kom haum.
Kev txhaj tshuaj thiab kev tuav lub siab
Siv lub zog txhaj tshuaj siab dua (1500-1800bar) thiab lub zog tuav (kwv yees li 80% ntawm lub zog txhaj tshuaj). Hloov mus rau lub zog tuav ntawm kwv yees li 95% ntawm tag nrho lub stroke, thiab siv lub sijhawm tuav ntev dua.
Kev ua tiav cov khoom tom qab
Yuav kom tiv thaiv tau qhov ntsws thiab deformation los ntawm kev tom qab crystallization, cov khoom feem ntau yuav tsum tau muab tso rau hauv dej kub.
Shanghai Rainbow Industrial Co., Ltd.yog tus tsim khoom,Shanghai pob zaj sawvMuab ib qho chaw nres tsheb ntim khoom kom zoo nkauj. Yog tias koj nyiam peb cov khoom, koj tuaj yeemtiv tauj peb,
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Email:Bobby@rainbow-pkg.com
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Lub sijhawm tshaj tawm: Lub Kaum Hli-04-2021