Taw qhia ntawm ABS yas txhaj tshuaj molding txheej txheem

ABS yas plays lub luag haujlwm tseem ceeb hauv kev tsim cov khoom yas, kev lag luam hluav taws xob, kev lag luam tshuab, thiab cov khoom siv hauv tsev vim nws lub zog txhua yam thiab kev ua haujlwm zoo. Cov khoom siv yas zoo nkauj uas xav tau electroplating hauv cov khoom siv yas feem ntau siv ABS yas,ABS yas qhov chawtau dav siv hauv lub neej.

ABS is commonly known as acrylonitrile{{0}}butadiene-styrene terpolymer, which is copolymerized by three monomers of acrylonitrile, butadiene and styrene. Due to the different proportions of the three monomers, they can have different properties and melting temperatures. If ABS is blended with other plastics or additives, it can be expanded to ABS with different uses and properties, such as impact grade, heat resistance grade, flame retardant Grade, transparent grade, enhanced grade, electroplating grade, etc., the electroplating grade is generally used in the manufacture of plastic products. The fluidity of ABS is between PS and PC. Its fluidity is related to injection temperature and pressure. The influence of injection pressure is slightly larger. Therefore, the higher injection pressure is often used during molding to reduce melt viscosity and improve mold filling. performance. ABS injection molding performance: the general melting point of ABS is about 170 degree , and the decomposition temperature is 260 degree ; the adjustable range of injection temperature is relatively large. During injection molding, the general operating temperature is 180-240 degree ; because of the presence of rubber components, it absorbs a small amount of water. During production, it needs to be dried, and can be dried at 80-90 degree for 1-2 hours; at the same time, due to the presence of rubber components , poor thermal stability, it is easy to decompose, when injection molding, the raw material should not stay in the barrel for too long; the melt viscosity is larger than PS, but the gate and runner are general, and the product can also be filled; the product is prone to static electricity, and the surface Easy to vacuum dust. The shrinkage rate is 5‰; the overflow value is 0.05mm.

(1) Kev ziab ntawm ABS yas
ABS yas muaj siab hygroscopicity thiab rhiab heev rau ya raws, thiab txaus ziab thiab preheating ua ntej ua tsis tau tsuas yog
Tshem tawm cov foob pob hluav taws-xws li npuas daim kab xev thiab nyiaj hlau ntawm qhov chaw ntawm cov khoom tshwm sim los ntawm cov pa vapor, thiab tseem pab cov yas yas thiab txo cov xim ntawm cov khoom.
Spots thiab moires. Cov dej noo ntawm ABS raw khoom yuav tsum tau tswj hauv qab no 0.13 feem pua ​​. Cov txheej txheem ziab ua ntej txhaj tshuaj molding yog: lub caij qhuav los yog lub caij ntuj no
Qhuav ntawm 75-80 degree rau 2-3h, thiab qhuav ntawm 80-90 degree rau 4-8h nyob rau hnub los nag nyob rau lub caij ntuj sov, yog hais tias cov khoom yuav tsum tau ua kom ib tug tshwj xeeb zoo gloss.
Los yog qhov nws tus kheej yog qhov nyuaj, thiab lub sij hawm ziab yog ntev dua, ncav cuag 8 mus rau 16 teev. Vim muaj cov kab dej vapor, cov pos huab ntawm qhov chaw ua haujlwm feem ntau
Ib qho teeb meem uas feem ntau tsis saib xyuas. Nws yog qhov zoo tshaj plaws los hloov lub hopper ntawm lub tshuab mus rau hauv lub tshuab cua kub hopper kom tsis txhob qhuav ABS hauv cov khoom.
Lub hopper absorbs noo noo dua, tab sis hom hopper no yuav tsum ntxiv dag zog rau cov av noo xyuas kom tsis txhob muaj cov khoom siv los ntawm overheating thaum cov khoom raug cuam tshuam.
Qhov feem ntawm cov khoom siv rov ua dua tsis tuaj yeem tshaj 30 feem pua, thiab kev siv cov khoom siv rov ua dua tsis tuaj yeem siv hauv electroplating - qib ABS.

(2) Kev txhaj tshuaj kub
Kev sib raug zoo ntawm qhov kub thiab yaj viscosity ntawm ABS yas yog txawv ntawm lwm yam amorphous plastics. Thaum kub nce thaum lub sij hawm melting txheej txheem, lub melting yeej txo qis heev. Thaum lub plasticizing kub (qhov kub ntawm qhov tsim nyog rau kev ua, xws li 220-250 degree) mus txog, yog tias qhov kub thiab txias tseem nce qhov muag tsis pom kev, nws yuav ua rau muaj kev kub ntxhov tsawg. Ntawm qhov tsis sib xws, cov thermal degradation ntawm ABS ua rau kom cov viscosity yaj, ua rau kev txhaj tshuaj molding nyuaj, thiab cov khoom siv ntawm cov khoom kuj txo. Yog li ntawd, txawm hais tias qhov kev txhaj tshuaj kub ntawm ABS yuav tsum siab dua li ntawm cov yas xws li polystyrene, nws tsis tuaj yeem muaj cua sov zoo li yav tas los. Rau qee qhov kev txhaj tshuaj molding tshuab nrog kev tswj kub tsis zoo, thaum tsim cov khoom ABS nce mus txog qee tus lej, nws feem ntau pom tias cov xim daj lossis xim av coking tau muab tso rau hauv qhov chaw, thiab nws nyuaj rau siv cov ntaub ntawv tshiab los txhaj rau hauv huab cua. , thiab lwm yam txoj kev tshem nws. Qhov laj thawj yog vim li cas ABS yas muaj cov khoom siv butadiene, thaum cov khoom siv yas yog ruaj khov rau qee qhov chaw hauv cov ntsia hlau zawj uas tsis yooj yim los ntxuav ntawm qhov kub siab dua, thiab raug kub hnyiab mus ntev, ua rau degradation thiab carbonized. Txij li thaum kub kub ua haujlwm yuav ua rau muaj teeb meem rau ABS, nws yog ib qho tsim nyog los txwv qhov kub ntawm lub cub tawg ntawm txhua ntu ntawm lub thoob. Tau kawg, ntau hom thiab cov khoom sib xyaw ntawm ABS muaj qhov sib txawv siv rau qhov cub kub. Xws li lub tshuab plunger, lub cub tawg kub yog khaws cia ntawm 180 230 degree C; ntsia hlau tshuab, lub cub tawg kub yog khaws cia ntawm 160 220 degree C. Nws yog tshwj xeeb yog tsim nyog hais tias, vim lub siab ua hauj lwm kub ntawm ABS, nws yog rhiab heev rau kev hloov nyob rau hauv ntau yam txheej txheem txheej txheem. Yog li ntawd, kev tswj qhov kub thiab txias ntawm qhov kawg ntawm lub thoob thiab lub nozzle yog ib qho tseem ceeb heev. Kev xyaum tau ua pov thawj tias qee qhov kev hloov pauv me me hauv ob ntu no yuav tshwm sim hauv ntu. Qhov kub hloov pauv ntau dua, cov teeb meem xws li weld seam, tsis zoo gloss, flash, pwm sticking, discoloration, thiab lwm yam.

(3) Txhaj tshuaj
Lub viscosity ntawm ABS molten qhov chaw yog siab dua li ntawm polystyrene lossis hloov polystyrene, yog li kev txhaj tshuaj ntau dua yog siv thaum txhaj tshuaj. Tau kawg, tsis yog txhua qhov ABS qhov yuav tsum tau muaj kev kub siab, thiab kev txhaj tshuaj qis tuaj yeem siv rau qhov me me, yooj yim thiab tuab. Thaum lub sij hawm txhaj tshuaj, lub siab nyob rau hauv cov kab noj hniav thaum lub sij hawm lub rooj vag kaw feem ntau txiav txim siab qhov zoo ntawm cov khoom thiab cov degree ntawm silver filamentous defects. Yog tias lub siab me me dhau lawm, cov yas ntim tau zoo heev, thiab muaj lub caij nyoog zoo ntawm kev sib cuag nrog cov kab noj hniav, thiab qhov chaw ntawm cov khoom yog atomized. Yog tias lub siab loj dhau lawm, kev sib txhuam cov nyhuv ntawm cov kab noj hniav yas yog qhov muaj zog, uas yog ib qho yooj yim los ua cov nplaum.

(4) Txhaj ceev
Cov khoom siv ABS nrog cov nyhuv txhaj tshuaj nruab nrab yog qhov zoo dua. Thaum qhov kev txhaj tshuaj nrawm dhau lawm, cov yas tau yooj yim scorched los yog decomposed rau hauv cov khoom vaporized, ua rau muaj qhov tsis xws luag xws li weld seams, tsis zoo gloss thiab redness ntawm cov yas ze ntawm lub rooj vag. Txawm li cas los xij, thaum tsim cov khoom nyias nyias -walled thiab complex qhov chaw, nws tseem tsim nyog los xyuas kom meej txaus txhaj tshuaj ceev, txwv tsis pub nws yuav nyuaj rau sau.

(5) Pwm kub
Lub molding kub ntawm ABS yog qhov siab, thiab pwm kub kuj tseem siab. Feem ntau, pwm kub yog hloov mus rau 75-85 degree . Thaum tsim cov khoom nrog thaj tsam loj, cov pwm ruaj khov yuav tsum yog 70-80 degree, thiab cov pwm txav tuaj yeem yuav tsum yog 50-60 degree. Thaum siv cov phab ntsa nyias nyias, cov cua sov tshwj xeeb ntawm cov pwm yuav tsum xav txog. Txhawm rau kom luv luv lub voj voog ntau lawm thiab tswj xyuas qhov kev ruaj ntseg ntawm pwm pwm, tom qab cov khoom raug tshem tawm, da dej txias, da dej kub lossis lwm yam kev teeb tsa kev siv tshuab tuaj yeem siv los them nyiaj rau lub caij txias kho lub sijhawm. kab noj hniav.

(6) Cov khoom tswj kom muaj nuj nqis
Thaum lub tshuab txhaj tshuaj molding tshuab txhaj tshuaj ABS yas, qhov ntim ntawm ib qho kev txhaj tshuaj tsuas yog 75 feem pua ​​​​ntawm cov qauv txhaj tshuaj. Txhawm rau txhim kho qhov zoo thiab qhov ruaj khov ntawm qhov chaw, lub ntsej muag gloss thiab qhov sib xws ntawm cov xim xim, lub ntim ntim yuav tsum yog 50 feem pua ​​​​ntawm nominal txhaj ntim.

(7) Kev xaiv ntawm kev txhaj tshuaj molding tshuab
Cov txheej txheem kev txhaj tshuaj molding tshuab (ntsia hlau ntev - txoj kab uas hla 20: 1, compression piv ntau dua 2, kev txhaj tshuaj siab tshaj 150MPa). Yog tias cov xim masterbatch siv los yog cov kev xav tau ntawm cov khoom muaj siab, cov ntsia hlau nrog lub taub me me tuaj yeem siv. Clamping quab yuam yog txiav txim siab raws li 4700-6200t / m, uas nyob ntawm qib yas thiab cov khoom yuav tsum tau ua.