Txhaj molded qhov chawCov dents yog tshwm sim los ntawm shrinkage depressions vim txias thiab hardening ntawm yas, feem ntau nyob rau hauv tuab-walled txoj hauj lwm, tuav, vaj tse, nraub qaum ntawm txiv ntseej inserts, thiab lwm yam.
I. Khoom siv.
(1) Cov khoom siv tsis txaus.
Ntsia hlau los yog plunger hnav hnyav, txhaj tshuaj thiab siab tuav cov khoom molten to, txo cov pwm filling siab thiab cov khoom ntim, ua rau cov khoom tsis txaus.
(2) Nozzle qhov loj dhau lossis me dhau.
Tsawg dhau yog yooj yim los thaiv cov channel pub, loj dhau yuav ua rau lub zog txhaj tshuaj me me, pwm txhaws nyuaj tshwm sim.
Thib ob, pwm yam.
(1) Lub rooj vag me me dhau los yog cov neeg khiav dej num nqaim dhau los yog ntiav dhau, qhov kev khiav hauj lwm qis qis, qhov tsis kam yog siab, lub yaj yog txias dhau lawm.
Lub rooj vag yuav tsum tsis txhob loj dhau, txwv tsis pub, tus nqi shear yuav poob thiab viscosity ntawm cov khoom yuav siab, uas kuj tsis tuaj yeem ua rau cov khoom puv. Lub rooj vag yuav tsum qhib rau hauv qhov tuab-walled ib feem ntawm cov khoom. Cov khoom txias txias uas muaj peev xwm txaus nyob rau hauv cov neeg khiav dej num yog tsim nyog kom tshem tawm cov khoom txias los ntawm kev nkag mus rau hauv kab noj hniav kom cov pwm tuaj yeem txuas ntxiv mus.
Lub rooj vag ntev ntawm lub rooj vag taw tes thiab lub rooj vag koob yuav tsum tau tswj xyuas hauv qab 1 hli, txwv tsis pub, cov yas yuav solidify ceev ntawm lub rooj vag thiab cuam tshuam rau kev hloov siab; yog tias tsim nyog, nce tus naj npawb ntawm qhov rooj qhov rooj lossis rooj vag txoj haujlwm kom tau raws li qhov xav tau tiag tiag; Thaum tus khiav yog ntev thiab tuab, tso pa tawm grooves yuav tsum tau teem rau ntawm ntug ntawm tus khiav kom txo tau cov nyhuv thaiv ntawm huab cua ntawm cov khoom ntws.
(2) Multi-gate pwm yuav tsum tau kho qhov ntim ceev ntawm txhua lub rooj vag, thiab nws yog qhov zoo dua los qhib lub rooj vag symmetrically.
(3) Qhov tseem ceeb ntawm cov pwm yuav tsum tau teeb tsa zoo nrog cov dej txias kom paub meej tias qhov txias ntawm pwm ua lub luag haujlwm zoo hauv kev tshem tawm lossis txo qis.
(4) Tag nrho cov pwm yuav tsum tsis muaj burr-dawb thiab muaj kev ruaj ntseg pwm sealing, thiab tuaj yeem tiv taus kev kub siab, kev kub ceev, thiab qis viscosity melt filling.
Peb, txheej txheem.
(1) Ua kom lub zog txhaj tshuaj, tuav lub zog, thiab ncua sijhawm txhaj tshuaj.
Rau cov yas uas muaj fluidity siab, siab siab yuav tsim cov npoo ya thiab ua rau lub qhov dej tawg. Cov khoom siv kub yuav tsum tau txo qis kom tsim nyog thiab qhov kub ntawm sab pem hauv ntej ntawm lub thoob thiab lub nozzle yuav tsum tau qis kom lub ntim hloov ntawm cov yaj mus rau hauv cov kab noj hniav yuav raug txo kom tsawg thiab nws yuav yooj yim rau txias solidify. Shrinkage tshwm sim nyob rau hauv lub rooj vag cheeb tsam, lub sij hawm tuav yuav tsum tau ncua.
(2) Ua kom qhov kev txhaj tshuaj nrawm kom ua rau qhov ntim tau yooj yim dua thiab tshem tawm feem ntau ntawm cov shrinkage.
(3) Thin-walled qhov chaw yuav tsum ua kom cov pwm kub kom ntseeg tau tias cov khoom ntws zoo; tuab-walled qhov chaw yuav tsum txo cov pwm kub kom ceev cov tawv nqaij kho thiab teeb tsa.
(4) txuas ntxiv lub sijhawm txias ntawm qhov chaw nyob hauv pwm, tswj lub voj voog ntau lawm, ua kom lub zog rov qab, sab pem hauv ntej ntawm cov ntsia hlau kom tuav tau qee qhov tsis zoo, thiab lwm yam yog qhov tsim nyog los txo qis qhov tshwm sim.
(5) cov khoom siv qis qis yuav tsum tau tawm ntawm pwm kom nws txias maj mam hauv huab cua lossis dej kub, uas tuaj yeem ua rau lub shrinkage kev nyuaj siab maj thiab tsis cuam tshuam rau kev siv.
Plaub, cov khoom siv raw.
Cov ntaub ntawv nyoos yog mos heev thiab yooj yim rau dents, ib txoj hauv kev zoo yog ntxiv cov tshuaj nucleating hauv cov yas kom ceev cov crystallization.
Thib tsib, cov khoom tsim.
Cov khoom tsim yuav tsum ua kom cov phab ntsa tuab tuab, sim zam kev hloov pauv ntawm phab ntsa tuab, xws li polypropylene shrinkage ntawm cov yas, thaum lub thickness hloov ntau tshaj 50%, nws yog qhov zoo tshaj plaws los siv cov tav es tsis txhob thickening.