Ib, Xaiv thiab npaj cov ntaub ntawv raw: thawj kauj ruam mus rau flatness
1. Nrhiav qhov zoo tshaj plaws hom thiab qhov sib piv ntawm fiber ntau
Qhov zoo ntawm cov fibers muaj qhov cuam tshuam ncaj qha rau qhov zoo ntawm cov pulp yuav tsim. Cov fibers hauv coniferous ntoo pulp yog qhov ntev (1.2-3.5 hli), uas tuaj yeem ua rau cov khoom muaj zog thiab tsis tshua tsim kua muag, tab sis tus nqi yuav tsum tau tswj kom tsis txhob muaj qhov ntxhib los ntawm fibers tau tangled. Cov fibers hauv cov ntoo tawv tawv yog luv luv (0.5-1.5 hli), uas tuaj yeem ua rau cov ntaub so ntswg zoo dua thiab pab ua kom cov pwm sib npaug. Nws yog qhov zoo tshaj plaws los sib xyaw cov ntoo ntoo ntoo thiab dav -tawm ntoo ntoo hauv qhov sib piv 3: 7 rau kev siv tswv yim kom tau txais qhov sib npaug ntawm lub zog thiab qhov smoothness.
2. Kev tswj xyuas meej ntawm cov txheej txheem pulping
Kev ntaus℃(tapping degree) yog ib qho tseem ceeb uas cuam tshuam li cas fibers kis tawm. Kev sib tsoo ntub dej tuaj yeem siv los ua cov txheej txheem micro ntxeem tau ntawm qhov chaw ntawm cov fibers, uas yuav txhim kho cov slurry lub peev xwm nqus. Piv txwv li, Apple cov tuam txhab xa khoom siv siv cov txheej txheem pulping graded. Ntev fibers (coniferous ntoo pulp) yog pulped ntawm siab concentration ntawm 10% los yog ntau tshaj kom lawv o thiab tawg; luv fibers (hardwood pulp) yog tswj kom muaj kev sib tw ntawm 30℃SR thiab 45℃SR kom tsis txhob raug txiav ntau dhau. Siv cov qauv pulping dynamic tau ua rau daim ntawv ntawm ib txoj kab tsim 15% muaj zog dua thiab txiav cov ntoo pulp siv los ntawm 8% ib tuj ntawm daim ntawv.
3. Kev sib xyaw ua ke ntawm kev ntxiv
Cationic polyacrylamide (CPAM) yog ib qho kev txhim kho uas cuam tshuam cov nqi kom cov fibers lo ua ke kom ruaj khov. Ntxiv 0.2% kev daws tuaj yeem tsim cov qauv hauv lub network thaum lub sij hawm tsis zoo ntawm lub cev qhuav dej, uas txiav cov nti poob ntau dua 86%.
Adhesive: Sib tov 0.2% AKD nplaum nrog 1% cationic starch tuaj yeem ua rau cov khoom sib txuas ntawm cov khaubncaws sab nraud povtseg 92% muaj zog thiab nres fibers los ntawm ripping tawm ntawm qhov chaw.
Waterproof agent: paraffin lotion ua ib txheej ntawm fiber ntau uas tiv thaiv nws ntawm dej puas thiab ua kom nws lub zog zoo ib yam.
2, Txhim kho cov txheej txheem molding kom tau txais kev tswj kom tsis pub dhau ib millimeter
1. Technology rau lub tshuab nqus tsev nqus molding
Nqus suction molding yog ib txoj hauv kev hauv kev lag luam ntim khoom. Nws siv qhov tsis zoo siab adsorption los sau cov pwm sib npaug nrog slurry. Kev tswj ntawm qhov tseem ceeb tsis muaj xws li:
Nqus theem: Khaws nws ntawm -0.06MPa thiab -0.08MPa kom paub tseeb tias cov slurry adsorbs sai thiab kom cov fibers tsis straining ntau dhau.
Hloov lub sij hawm adsorption raws li qhov tuab ntawm cov khoom. Nws nquag siv 8 mus rau 15 vib nas this. Yog tias nws luv dhau, nws yuav tsis sau tag nrho, thiab yog tias nws ntev dhau lawm, cov fibers yuav nyob thiab sib nrug.
Qhov kub ntawm cov pwm: Txhawm rau kom ceev cov evaporation ntawm dej thiab txhawb hydrogen bonding ntawm fibers, preheat lub pwm mus rau 150 mus rau 200 degrees Celsius.
2. Cov txheej txheem ntawm ntub compression molding
Thaum cov khoom muaj 50% mus rau 75% noo noo cov ntsiab lus, nws yog kho nrog ntub nias. Cov khoom nruj tuaj yeem nce los ntawm 20% thaum lub siab nyob nruab nrab ntawm 0.4 thiab 0.6 MPa thiab qhov kub ntawm 180 thiab 200 degree. Qhov saum npoo roughness yog Ra tsawg dua lossis sib npaug li 0.8 μm. Ib lub tuam txhab ntiav cov tshuab kub xovxwm los nias thiab polish lub iPhone lub tais sab hauv. Qhov no ua rau saum npoo du zoo li daim iav thiab txo qis kev sib txhuam coefficient rau 0.354.
3. Tshuab ziab khaub ncaws hauv microwave
Microwave ziab tuaj yeem ua kom sov sab hauv thiab sab nraud ntawm cov khoom tib lub sijhawm, uas txo qhov kev ntxhov siab ntawm ziab piv rau cov cua kub kom qhuav. Los ntawm kev tswj kom qhuav nkhaus hauv ntu (nrog rau qhov kub ntawm<90 ℃ in the front section and 120 ℃ -150 ℃ in the back section), the surface fibers may be prevented from drying out soon and becoming brittle, and the moisture content of the product can be uniformly reduced to 10% -12%.
3, Cov tswv yim tshiab rau pwm tsim: rhuav tshem lub cev ciam teb
1. Ua cov pwm nrog ntau qhov tseeb
Xaiv cov khoom tsim nyog: Ua los ntawm aviation- qib aluminium alloy (xws li 7075-}T6) los yog chrome-plated steel, nrog ib tug hardness ntawm HRC60 los yog siab dua, thiab muaj peev xwm lis ntau tshaj 100,000 molding cycles.
Kev kho saum npoo: CNC tsib-axis machining chaw yog siv los ua kom cov pwm kab noj hniav kom meej, uas muaj qhov roughness ntawm Ra tsawg dua lossis sib npaug li 0.4 μ m. Kev kho chromium plating ua rau saum npoo 30% nyuaj thiab ua rau cov fibers tsis tshua lo rau nws.
Cov txheej txheem rau kev tso tawm: Kom paub tseeb tias cov slurry yog sib npaug zos absorbed thiab tsis tau daig, teem lub qhov tso pa (nrog ib txoj kab uas hla ntawm 0.5-1.0 hli thiab qhov nrug ntawm 15-20 hli) thiab lub 0.01 hli lim tshuaj ntsuam nyob rau hauv txoj kev zoo tshaj plaws.
2. Kev ua kom zoo ntawm cov qauv txheej txheem topology
Lub pwm kab noj hniav yog tsim los ua lub teeb yuag siv CAE simulation tsom xam. Lub Huawei Mate series ntim pwm, piv txwv li, muaj honeycomb- cov qauv siv zog ntxiv uas ua rau nws 30% sib dua thiab 40% tiv taus ntau dua. Cov kua hauv lub tais pwm muaj 12 qhov sib txawv ntawm qhov sib txawv ntawm cov kabmob honeycomb. Nws siv topology optimization kom pom qhov sib npaug ntawm qhov hnyav thiab lub zog.
3. Ntxiv rau tus kheej -tu feature
Ultrasonic vibration li (20kHz-40kHz) tuaj yeem ua rau hauv pwm tsim kom ceev ceev cov khib nyiab fiber ntau thaum lub sij hawm molding. Xwb, Teflon txheej (5-10 μ m tuab) tuaj yeem siv los txo cov fiber ntau adherence thiab xav tau kev tu tib neeg.
4, Kev Kawm Txuj Ci: Kev hloov ntawm chav kuaj mus rau daim ntawv thov kev lag luam
Case 1: Lub tais sab hauv ntawm Apple iPhone
Cov khoom xyaw nyoos yog xyoob pulp (60%), qab zib pulp (30%), thiab nanofibers (10%). Cov fibers yog 0.8 mus rau 1.2 millimeters ntev.
ntub nias shaping siab ntawm 0.5MPa, kub ntawm 190 degree, thiab lub sij hawm ntawm 40 vib nas this; microwave ziab lub hwj chim ntawm 5kW thiab lub sij hawm ntawm 8 feeb.
Cov nyhuv: Qhov roughness ntawm qhov chaw yog Ra tsawg dua los yog sib npaug rau 0.5 μm, qhov yuam kev ntawm lub xov tooj contour yog<0.1 mm, and the phone passed the 1.5-meter drop test.
Case 2: Ntim rau Sony Xperia 1 V
80% recycled pulp thiab 20% degradable conductive number case ua cov khoom xyaw nyoos. Qhov saum npoo resistivity yog 10 ⁶ -10 ⁹ Ω / sq.
Cov txheej txheem suav nrog lub tshuab nqus tsev nqus pwm nrog lub tshuab nqus tsev ntawm -0.07MPa thiab lub sijhawm adsorption ntawm 12 vib nas this. Hom LOGO yog laser engraved mus rau qhov tob ntawm 0.03 millimeters.
Cov nyhuv: Qhov kev hnav khaub ncaws saum npoo tau dhau 500 Martindale cov kev sim, thiab kev thauj mus los kub thiab av noo ntsuas tau muab tso rau hauv qhov chaw.
