Acrylic jakisoni akamaumba ndondomeko

Akriliki mankhwala amatchedwa polymethyl methacrylate (PMMA in English). Chifukwa cha zofooka za PMMA pamwamba kuuma, kukanda kosavuta, kukana kukhudzidwa kochepa, osauka akamaumba fluidity, etc., kusinthidwa kwa PMMA kwawonekera motsatira. Monga copolymerization ya methyl methacrylate ndi styrene ndi butadiene, Kuphatikiza kwa PMMA ndi PC, etc..

Kuthamanga kwa PMMA ndi koipa kuposa kwa PS ndi ABS, ndipo kusungunuka kwamphamvu kumakhudzidwa kwambiri ndi kusintha kwa kutentha. Pa nthawi ya Njira Yourira, The Sungunulani mamasukidwe akayendedwe makamaka anasintha kuchokera jekeseni kutentha. PMMA ndi polima amorphous ndi kutentha kosungunuka kuposa 160 ° C ndi kutentha kwa 270 ° C..

1. Pulasitiki processing

PMMA ili ndi mlingo wina wa kuyamwa madzi, ndi kuchuluka kwa mayamwidwe amadzi 0.3-0.4%, ndi chinyezi cha jekeseni akamaumba ayenera kukhala pansipa 0.1%, kawikawiri 0.04%. Kukhalapo kwa madzi kumayambitsa thovu, mizere ya gasi, ndi kuchepetsa kuwonekera mu kusungunuka. Choncho iyenera kuumitsidwa. Kuyanika kutentha ndi 80-90 ℃, ndipo nthawi ndi yoposa 3 maola. Zida zobwezerezedwanso zitha kugwiritsidwa ntchito 100% nthawi zina. Ndalama zenizeni zimadalira zofunikira za khalidwe, kawirikawiri kutha 30%. Zida zobwezerezedwanso ziyenera kupewa kuipitsa, mwinamwake izo zidzakhudza kuwonekera ndi katundu wa mankhwala omalizidwa.

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2. Jekeseni akamaumba makina kusankha

PMMA ilibe zofunikira zapadera zamakina opangira jekeseni. Chifukwa cha kukhuthala kwake kwakukulu, pakufunika phula lozama kwambiri komanso bowo lalikulu la nozzle. Ngati mphamvu ya mankhwala ndi apamwamba, wononga yokhala ndi chiŵerengero chokulirapo mpaka m'mimba mwake iyenera kugwiritsidwa ntchito popanga pulasitiki yotsika kutentha. Kuphatikiza apo, PMMA iyenera kusungidwa mu hopper youma.

3. Mapangidwe a nkhungu ndi zipata

The Kutentha kwamphamvu akhoza kukhala 60 ℃-80 ℃, m'mimba mwake wa wothamanga wamkulu ayenera kufanana ndi taper wamkati, ngodya yabwino kwambiri ndi 5° mpaka 7°, ngati mukufuna kubaya 4mm kapena kupitilira apo, ngodya iyenera kukhala 7 °, ndi m'mimba mwake wa wothamanga ayenera kufika 8 ku 10mm, kutalika kwa chipata sikuyenera kupitirira 50mm. Pakuti mankhwala ndi khoma makulidwe zosakwana 4mm, m'mimba mwake wa wothamanga ayenera kukhala 6-8mm

Pakuti mankhwala ndi khoma makulidwe kuposa 4mm, m'mimba mwake ayenera kukhala 8-12 mm. Diagonal, Kuzama kwa chipata chofanana ndi fani komanso tabular kuyenera kukhala 0.7 ku 0,9t (t ndi makulidwe a khoma lazinthu), ndi m'mimba mwake wa chipata singano ayenera kukhala 0.8 ku 2mm; ang'onoang'ono kukula ayenera kugwiritsidwa ntchito otsika mamasukidwe akayendedwe.

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Mabowo wamba amakhala ndi kuya kosachepera 0.05 ndi m'lifupi mwake 6 mm. Ngodya yowongoka ili pakati pa 30′-1° ndi 35′-1° 30 ° m'chigawo chapakati.

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4. Kutentha kwa kutentha

Itha kuyezedwa ndi njira yojambulira mpweya: kuyambira 210 ° C mpaka 270 ° C, kutengera zomwe wapereka.

Chotsani mpando wakumbuyo, pangani mphuno ya makina opangira jekeseni kusiya sprue bushing, ndiyeno pamanja kuchita plasticization jekeseni akamaumba, chomwe ndi kuumba jakisoni wa mpweya.

5. Kutentha kwa jekeseni

Jekeseni wofulumira angagwiritsidwe ntchito, koma kupewa kupsinjika kwakukulu kwamkati, Ndikoyenera kugwiritsa ntchito jekeseni wamitundu yambiri, monga wodekha-wofulumira-wochedwa, etc., pobaya ziwalo zokhuthala, gwiritsani ntchito liwiro lodekha.

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6. Nthawi yotsekeredwa

Ngati kutentha ndi 260 ° C, nthawi yokhalamo sichitha kupitirira 10 mphindi, ndipo ngati kutentha kuli 270 ° C, nthawi yokhalamo sichitha kupitirira 8 mphindi.

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