Rau lub ntsiab lus tseem ceeb ntawm PP txhaj tshuaj moulding

Rau lub ntsiab lus tseem ceeb ntawm PP txhaj tshuaj moulding.Qhov kev ua cov ntaub ntawv yas roj yas yog feem ntau ua rau yaj, ntws, lub cev, thiab tom qab ntawd txias rau hauv cov khoom tiav. Nws yog txheej txheem ntawm cua sov thiab tom qab ntawd txias. Nws kuj yog cov txheej txheem uas cov yas hloov los ntawm pellets rau cov duab sib txawv. Cov hauv qab no yuav piav qhia txog kev ua tiav los ntawm kev pom ntawm ntau theem. Txheej txheem.

1. Melting

Lub rhaub tso cai rau raw khoom hais maj mam yaj mus rau hauv cov dej ntws, uas yog tsim nyog rau kev hloov kho kub ntawm cov khoom sib txawv. Kev nce qhov kub thiab txias yuav ua rau kom nrawm nrawm ntawm cov khoom siv raw, uas tuaj yeem nce efficiency tab sis yuav tsis lav tawm los. Nws yuav tsum haum Balance.

Ntxiv thiab, Cov nyhuv zoo thiab cov yam ntxwv ntawm cov thermal tawg ntawm PP yog qhov zoo tshaj plaws los ua kom cov ntaub ntawv raw khoom ntws mus rau qhov tuag thaum lub sij hawm tsim khoom kom tsis txhob muaj cov khoom tsis txaus lossis rov qab.. Backflow txhais tau hais tias qhov ntws ntawm cov khoom siv raw yog nrawm dua li cov zis tawm. Kev nce hauv nruab nrab ntws efficiency sib npaug ntawm qhov nce hauv MFR, uas yog ib qho ntawm cov txheej txheem muaj, tab sis nws kuj ua rau MFR txawv txav, uas yuav ua rau muaj kev tsis ruaj khov ntxiv, uas tuaj yeem nce tus nqi tsis raug.

Txawm li cas los, cov PP khoom tsis yog cov khoom uas muaj qhov siab precision vim yog daim ntawv thov, yog li qhov cuam tshuam tsis loj.

2. Ntsia hlau

Feem ntau ntawm PP txheej txheem yog tsav los ntawm cov ntsia hlau los tsav lub fluidity, yog li qhov tsim ntawm cov ntsia hlau muaj kev cuam tshuam zoo. Qhov loj ntawm txoj kab uas hla cuam tshuam rau cov zis, thiab qhov sib piv compression cuam tshuam rau tus nqi siab thiab cov zis thiab cov nyhuv ntawm cov khoom tiav. Qhov no kuj suav nrog ntau yam khoom siv. (Xim masterbatch, additives thiab modifiers) sib tov nyhuv.

Kev khiav ntawm raw cov ntaub ntawv tsuas yog nyob ntawm lub rhaub, tab sis qhov sib txhuam kub ntawm cov khoom siv raw yuav kuj tsim kom muaj kev sib txhuam kub kom nrawm lub fluidity, yog li cov ntsia hlau compression piv yog me me thiab qhov ntws me me, thiab kev sib hloov ceev yuav tsum tau nce. Kev sib txhuam cua sov yuav ntau dua li ntawm cov ntsia hlau nrog qhov loj compression piv.

Yog li ntawd, nws feem ntau hais tias tsis muaj tus tswv hauv kev ua cov yas, thiab tus neeg uas ua tib zoo nkag siab txog kev ua haujlwm ntawm lub tshuab yog tus tswv. Cov cua kub ntawm cov khoom siv raw tsis yog lub tshuab cua sov xwb, tab sis kuj muaj kev sib txhuam kub thiab lub sij hawm nyob.

Yog li qhov no yog ib qho teeb meem siv tau, thiab kev paub pab daws teeb meem kev tsim khoom thiab kev ua haujlwm zoo. Yog tias cov ntsia hlau yuav tsum muaj qhov sib xyaw ua ke zoo, sometimes two-stage different screws or twin-shaft screws are designed and different types of screws are divided into sections to achieve various mixing effects.

3. Mould or die head

Plastic reshaping relies on the mold or die head. The injection molded product is three-dimensional, and the mold is more complex, and shrinkage must be considered. The others are flat, strip, and needle-shaped continuous product die heads. If it is a special shape, It is classified as a special shape, and needs to pay attention to the problem of cooling and shaping immediately.

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Most of the plastic machines are designed like injection syringes, and the extrusion force driven by the screw will cause huge pressure on the small outlets and improve production efficiency. When the die head is designed as a flat surface, yuav ua li cas kom cov ntaub ntawv raw khoom sib npaug ntawm tag nrho saum npoo yog qhov tseem ceeb heev.

4.Txias

Ntxiv rau lub rooj vag sprue pouring raw khoom, cov txhaj tshuaj pwm kuj muaj cov dej txias channel kom txias cov khoom siv raw khoom tsim. Extrusion molding tso siab rau cov dej txias channel hauv cov menyuam kom ua tiav cov nyhuv txias, tsuas yog rab riam cua xwb, cov dej txias yog ncaj qha rau ntawm lub tshuab tshuab, thiab cov txheej txheem txias xws li hollow tshuab.

5.Txuas ntxiv

Reprocessing thiab txuas ntxiv ntawm cov khoom tiav yuav txhim khu cov nyhuv. Piv txwv, lub strapping siv yog tsav los ntawm pem hauv ntej thiab nram qab rollers ntawm qhov sib txawv speeds yuav ua rau lub extension nyhuv. Lub zog tensile ntawm qhov taw qhia txuas ntxiv ib feem ntawm cov khoom tiav yog ntxiv dag zog thiab nws tsis yooj yim los tsim kua muag, tab sis nws yog qhov yooj yim heev los tsim kua muag nyob rau hauv txoj kab rov tav. Kev faib tawm qhov hnyav ntawm molecular kuj tseem cuam tshuam cov nyhuv txuas ntxiv thaum lub sijhawm ua haujlwm siab. Tag nrho cov khoom extruded suav nrog fibers muaj qhov sib txawv. Lub tshuab nqus tsev thiab lub siab sib sau tuaj yeem suav tias yog lwm hom kev txuas ntxiv.

6, ntsws

Txhua yam khoom siv raw muaj qhov teeb meem ntawm shrinkage. Lub shrinkage yog tshwm sim los ntawm thermal expansion thiab txias shrinkage thiab internal stress generated thaum lub sij hawm siv lead ua.

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Feem ntau hais lus, thermal expansion thiab contraction yog yooj yim dua mus kov yeej, thiab lub sijhawm txias tuaj yeem ua kom ntev hauv kev ua haujlwm, thiab lub siab tuaj yeem tswj tau tsis tu ncua. Crystalline raw cov ntaub ntawv zoo li muaj qhov sib txawv loj dua li cov ntaub ntawv uas tsis yog crystalline, uas yog kwv yees li ib txhiab rau PP. Kaum rau, tab sis ABS tsuas yog kwv yees li plaub txhiab. Ib feem ntawm qhov sib txawv no loj heev. Qhov no yuav tsum tau kov yeej ntawm pwm, los yog cov shrinkage txo cov additives feem ntau ntxiv kom kov yeej lub phaj extrusion. LDPE feem ntau ntxiv los txhim kho qhov teeb meem ntawm caj dab.