Kev thim siab tsis siab ntawm qhov chaw txhaj tshuaj molded? Tom qab nyeem ntawv no koj yuav to taub

Feem ntau cov khoom siv pob tshab ntawm lub khw niaj hnub no yog cov tshuaj polymethyl methacrylate (feem ntau hu ua acrylic or plexiglass, codenamed PMMA) thiab polycarbonate (codenamed PC). Polyethylene terephthalate (Tsiaj), pob tshab nylon. AS (acrylonitrile-styrene copolymer), polysulfone (code PSF), thiab lwm yam., Cov uas peb raug feem ntau raug rau PMMA. PC thiab PET yog peb hom ntawm plastics. Vim tias luag khij, cov nram qab no peb lub plastics coj los ua ib qho piv txwv los sib tham txog cov yam ntxwv ntawm cov khoom yas thiab cov txheej txheem txhaj tshuaj.

Ua ntej, qhov teeb meem tshwm sim uas yuav tsum tau them nyiaj rau thaum lub caij txhaj tshuaj molding ntawm cov hnab yas

Vim tias lub teeb siab loj ntawm cov khoom uas nrov, cov khoom zoo ntawm cov khoom yas yuav tsum tau ua kom nruj heev, thiab yuav tsum tsis muaj cov pob zeb, cov qhov cua, thiab cov xim dawb. Cov dej khov, cov pob zeb, cov pob zeb tsis zoo, cov lus qhia tsis zoo, thiab lwm yam teeb meem, thiab yog vim li no yuav tsum ua kom tiav cov txheej txheem raw khoom, khoom, molds, thiab tsim khoom,

Qhov thib ob, vim tias cov hnab yas yog cov melting loj thiab cov neeg pluag tsis muaj zog, thiaj li tsim nyog rau cov khoom zoo, tsim nyog nws yuav tsum ua kom zoo me ntsis hauv cov txheej txheem tsis xws li qhov kub, kev txhaj tshuaj, kev txhaj tshuaj, thiab lwm yam. , yog li hais tias lub hnab yas txhaj tau puv nrog pwm, tab sis tsis yog kev ntxhov siab sab hauv ua rau deformation thiab ntuav ntawm cov khoom.

Hauv qab no nws yog npaj rau hauv raw cov ntaub ntawv. Rau cov khoom thiab mould cov tseev kom muaj, kev txhaj molding txheej txheem thiab cov khoom raw cov khoom tuav, tham txog cov xwm txheej uas yuav tsum tau muab sau tseg.

1. Kev npaj thiab ziab ntawm cov Khoom Raw Vim yog muaj cov khoom tsis haum rau hauv cov yas, cov transparency ntawm cov khoom yuav raug cuam tshuam, thiab yog li ntawd khaws thiab thauj. Thaum txoj kev pub mis, peb yuav tsum xyuam xim rau lub foob kom paub meej tias raw cov ntaub ntawv raw. Nyob rau hauv kev, dej yog muaj nyob rau hauv cov ntaub ntawv raw, thiab raw cov ntaub ntawv yog deteriorated thaum rhuab. Yog li, cov ntaub ntawv raw yuav tsum tau qhuav thiab lub raj qhwv qhuav yuav tsum tau siv rau kev pub mis.

Nws tseem ceeb heev uas yuav tsum nco ntsoov tias thaum txoj kev ziab tshav kub, cov pa taws yuav tsum tau lim dej kom zoo thiab dehumidified kom paub meej tias nws tsis paug cov khoom.

2. Tu cov thawv ntoo, cov ntsia hlau thiab cov khoom siv

Yuav kom tiv thaiv tau cov kabmob ntawm cov ntaub ntawv raw thiab muaj cov khoom qub los yog cov khoom tsis muaj nyob rau hauv cov hollows ntawm cov ntsia hlau thiab cov accessories, muaj tshwj xeeb resins nrog cov thermal stability txom nyem. Vim li no, cov neeg siv cov tshuaj ntxuav tes siv los ntxuav tag nrho cov khoom ua ntej thiab tom qab siv, yog li ntawd lawv yuav tsum tsis txhob raug kab mob nrog impurities. Thaum tsis muaj tus neeg tu lub cev, tus ntsia hlau yuav tsum muab ntxuav nrog cov resins xws li PE thiab PS.

Thaum mus txuas ib ntus, yuav kom tsis txhob muaj cov khoom raw los ntawm qhov kub nyob ntev, ua rau kev daws teeb meem, qhov kub ntawm lub tshuab ziab khaub ncaws thiab cov thoob yuav tsum tau txo. Piv txwv, qhov kub ntawm cov thawv hauv PC, PMMA, thiab lwm yam yuav tsum tau txo kom tsawg dua 160 ° C. (Lub hopper ntsuas kub yuav tsum tsawg dua 100 ° C rau PC)

3. Cov teeb meem yuav tsum tau muab sau rau hauv cov qauv ntawm cov pwm (nrog rau kev tsim ntawm qhov khoom)

Yuav kom tsis txhob rov qeeb, los sis tsis sib npaug los ntawm plua plav yas uas tsis zoo, ua rau muaj qhov tsis zoo thiab qhov teeb meem, feem ntau ntawm cov qauv tsim, yuav tsum tau mloog zoo rau cov nram qab no:

Lub phab ntsa ntawm qhov yuav tsum ua kom zoo li tsim nyog, thiab cov ntawv yuav tsum loj txaus;

Qhov kev hloov no yuav tsum maj mam. Hloov kev sib txig kom tsis txhob ntse ntse. Ntse npoo, tshwjxeeb cov khoom hauv PC yuav tsum tsis txhob muaj khoob;

Rooj vag. Cov neeg khiav dej yuav tsum dav thiab luv li sai tau, thiab qhov chaw nkaum qhov chaw yuav tsum tau teem raws li qhov kev sib tw ntawm kev sib tw. Yog tias tsim nyog, cov khoom noj txias yuav tsum ntxiv.

Cov pwm ntawm lub puab tsaig yuav tsum tau du, nrog rau cov uas tsis tshua muaj siab (dua li 0.8);

Qhov quav. Lub tank yuav tsum txaus kom paug tawm cua thiab roj cua hauv yaj.

Tsuas yog tus tsiaj, lub phab ntsa yuav tsum tsis txhob thim, feem ntau tsis tshaj lmm.

4. Cov teeb meem yuav tsum tau muab sau rau hauv kev txhaj tshuaj molding (nrog rau kev siv tshuaj molding tshuab)

Yuav kom txo cov kev ntxhov siab thiab cov teeb meem ntawm qhov chaw tsis zoo, cov hauv qab no yuav tsum tau muab sau rau hauv kev txhaj tshuaj molding:

Yuav tsum siv cov ntsia thawv tshwj xeeb, txhaj tshuaj molding tshuab nrog cais kev tswj kub tsis muaj cav;

Cov tshuaj tiv thaiv kab mob yuav tsum siab tshaj cov tshuaj txhaj yog tias cov yas tawv tsis zoo.

Txhaj siab: feem ntau siab mus kov yeej cov teeb meem loj yaj viscosity, tab sis qhov siab yog siab dhau heev lawm yuav ua rau muaj teeb meem hauv lub cev los ntawm kev tsis sib haum thiab deformation;

Kev Txhaj Tshuaj Txhaj Tshuaj: Yog hais tias filling lub pwm, nws yuav tsum qis qis, nws yog qhov zoo tshaj plaws los siv qe menyuam yaus qeeb qeeb;

Siab tuav lub sij hawm thiab molding cycle: nyob rau hauv rooj plaub ntawm sau cov khoom kom paub meej tias tsis muaj kev nyuaj siab los yog npuas tshwm sim; nws yuav tsum kom luv li sai tau kom txo tau qhov chaw nyob lub sij hawm ntawm yaj nyob rau hauv lub thoob;

Ntsia hlau ceev thiab nraub qaum siab: Hauv qhov tsim nyog ntawm qhov kev zoo siab ntawm kev sib koom ua ke, nws yuav tsum muaj tsawg li sai tau kom tsis txhob muaj kev daws teeb meem.

Pwm sov: Qhov txias ntawm qhov khoom yog qhov zoo los sis qhov phem. Nws muaj feem xyuam rau txoj kev zoo. Yog li no, cov pwm kub kub yuav tsum muaj peev xwm tswj tau cov txheej txheem. Yog tias ua tau, ntsuas kub yuav tsum siab dua.

5. Lwm yam teeb meem

Raws li nws yog ib qho tsim nyog los tiv thaiv qhov zoo ntawm lub sab saum npoo los ntawm degraded, tso tus neeg sawv cev yuav tsum siv tsawg li sai tau thaum lub caij txhaj tshuaj; thaum siv cov ntaub ntawv coj los siv, nws yuav tsum tsis txhob yuav ntau dua 20%.

Ntxiv nrog rau kev sib tw, cov khoom yuav tsum rov qab kho kom tshem tawm kev ntxhov siab. PMMA yuav tsum tau qhuav hauv cua kub ntawm 70-80 ° C rau 4 xuab moos; Lub PC yuav tsum tau ntxuav ntawm huab cua thiab glycerin. Cov dej khov thiab lwm cov cua sov 110-135 ° C, lub sij hawm yog txiav txim los ntawm cov khoom, qhov siab tshaj plaws xav tau ntau tshaj 10 teev. Tus tsiaj PET yuav tsum tau siv ib txoj hauv kev kom ncav caj dab kom tau cov cuab yeej zoo.

Thib ob, qhov kev kawm ntawm cov yas pob tshab

Pob tshab yas yuav tsum xub xub thawj siab, ua raws li qee lub zog ntawm lub zog thiab hnav ua haujlwm, tej yam ua haujlwm, kev kub-resistant qhov zoo dua, tshuaj lom neeg ua hauj lwm yuav tsum yog superior, cov dej nqus dej yuav tsum me, tsuas yog ua li no hauv siv, kom tau raws li kev pom zoo Tus thov yuav nyob tsis hloov mus ntev.

Comparatively muaj PC yog ib qho kev xaiv zoo tshaj plaws, tab sis nws tsuas siv nyuaj raw khoom thiab kev txhaj tshuaj molding, PMMA tseem yog qhov tseem ceeb xaiv (rau kev xav tau ntawm cov khoom siv), thiab PPT tuaj yeem tau txais kev zoo vim ncab. Vim nws cov khoom siv dag zog, nws yog siv ntau ntim thiab ntim.

Thib peb, txheej txheem yas txhaj molding txheej txheem

Cov yam ntxwv ntawm cov cuab yeej ntawm cov pob tshab: Ntxiv rau cov teeb meem saum toj no, cov khoom yas kuj muaj qee cov cuab yeej twj ywm, uas yog piav raws li nram no:

1. PMMA txheej txheem PMMA viscosity, fluidity yog cov neeg txom nyem me ntsis, yog li nws yuav tsum muaj cov khoom kub, kev txhaj tshuaj siab txhaj koob tshuaj, tsuas yog qhov kev txhaj tshuaj tiv thaiv kab mob siab tshaj qhov kev txhaj tshuaj, tab sis lub siab muaj zog, cov khoom ntsws.

Kev ntsuas kub ntau yog dav, melting qhov kub yog 160 ° C, thiab cov lwj siab kub mus txog 270 ° C, yog li cov khoom ntsuas kub ntau yog qhov dav thiab qhov kev ua haujlwm zoo. Yog li, lub cev muaj peev xwm tuaj yeem kho tau zoo dua los ntawm kev pib txhaj tshuaj. Kev tsis zoo, kev txom nyem hnyav, yooj yim kos paj, yoojyim rau kev yoojyim, nws yuav tsum nce lub pwm kub, txhim kho txoj txheej txheem, kom kov yeej cov teeb meem no.

2. Lub PC muaj kev siab khov siab, siab kub lub cev thiab cov pluag tsis zoo, vim li ntawd nws yuav tsum tau txhaj ntawm qhov ntsuas kub (nruab nrab ntawm 270-320 ° C). Lus hauv no, Kuj hais lus, cov khoom siv ntsuas kub ntau yog nqaim thiab cov processability tsis zoo li PMMA. Kev txhaj tshuaj tiv thaiv tau me ntsis ua rau fluidity, tab sis vim yog lub zog loj, nws tseem yuav tsum tau txhaj tshuaj loj. Yuav kom tiv thaiv kev ntxhov siab, kev tuav lub sijhawm yuav tsum yog luv li sai tau.

Kev poob siab, kev ruaj ntseg, tiam sis kev ntxhov siab ntawm cov khoom, kwj kom yooj yim, yog li nws tsim nyog los txhim kho qhov kub dua qhov siab kom zoo dua qub, thiab los ntawm cov pwm kub, txhim kho kev tuaj pwm thiab tom qab ua tiav txo tau kev ntes. Thaum qhov kev txhaj tshuaj tsis tshua muaj me ntsis lawm, cov teeb meem xws li corrugation yog yooj yim generated ntawm lub rooj vag, qhov kub ntawm cov hluav taws xob nozzle tswj ib tus zuj zus, qhov kub ntawm pwm yog siab, thiab txoj kev khiav thiab lub qhov rooj tiv thaiv me me.

3. Tsuag moulding temperature yog siab, thiab cov khoom siv ntsuas kub ntau yog nqaim (260-300 ° C), tab sis tom qab yaj, fluidity zoo, yog li tus txheej txheem tsis zoo, thiab feem ntau nyob hauv lub taub hau kom tiv thaiv tau cov khoom ntws. Mechanical zog thiab cov khoom tsis muaj siab tom qab txhaj tshuaj thiab yuav tsum raug kho los ntawm ncab cov txheej txheem thiab kev hloov.

Pwm sov yog raug tswj kom tsis txhob muaj kev kub ntxhov. Tus deformation yog qhov tseem ceeb tshaj thiab yog vim li cas kub khiav moulds tau pom zoo. Cov pwm kub yuav tsum siab, txwv tsis pub nws yuav ua rau cov neeg pluag tsis muaj zog thiab ua nyuaj rau hauv kev ua txhaum.

Plaub, cov yas teeb meem thiab cov kev daws teeb meem

Vim yog qhov chaw, tsuas yog cov teeb meem uas cuam tshuam rau lub koob meej ntawm cov khoom sib tham txog ntawm no. Cov teeb meem muaj raws li nram no:

1. Craze: los ntawm kev txhim kho thiab txheej txheem, qhov kev ntxhov siab hauv lub cev, kev ntxhov siab nyob rau hauv txoj kev taw qhia, kom lub pob txha hloov tshiab, thiab cov kev qhia tsis muaj zog ua ib qho txawv ntawm qhov tsis muaj zog thiab flash ipk, thaum tom qab nthuav, khoom yuav tawg.

2. Cov Kab Npoo: Cov dej ua pa thiab lwm cov roj cua uas muaj nyob rau hauv cov khoom siv tsis tuaj yeem muab tawm (hauv cov txheej txheem pwm) los yog vim tsis txaus, qhov condensing ntug condensing sai heev los tsim kom muaj "nqus npuas".

3. Qhov txawv ntawm qhov sib txawv ntawm lub qhov muag: qhov roughness ntawm lub pwm tseem ceeb yog loj, thiab ntawm qhov tod tes, qhov hleb yog dhau thaum ntxov, kom lub pob zeb tsis tuaj yeem luam tau lub xeev ntawm cov pwm txheej, tag nrho cov uas ua rau saum npoo muaj ib qho me me tsis sib xws, uas ua rau cov khoom poob plhaub.

4. Tsho Khaub Ncaws. Huab cua Halo: Feem ntau yog vim hmoov av nyob hauv cov huab cua ntog rau hauv cov khoom siv los yog raw cov khoom noo noo ua los ntawm ntau dhau lawm.

5. Haus luam yeeb dawb. Cov ntsiab lus dub: Feem ntau ntawm cov yas nyob hauv lub thoob, vim lub zos overheating, tus qauv ntawm lub thoob yuav tsum tau decomposed los yog deteriorated.

6. Seismic qauv: hais txog lub pob txha ua tau los ntawm qhov chaw nruab nrab ntawm cov nroj tsuag. Yog vim li cas ho yog vim hais tias cov viscosity ntawm yaj yog ntau heev, cov ntaub ntawv pem hauv ntej tau condensed nyob hauv cov kab noj hniav, thiab tom qab ntawd cov khoom lov los ntawm qhov ntxees qhov chaw, ua rau saum npoo muaj ib qho kev poob siab txawv. .