Kupanga jekeseni kwa zinthu za PMMA

Zida za PMMA zimadziwika kuti plexiglass, acrylic, etc. Dzina la mankhwala ndi polymethyl methacrylate.PMMA ndi zinthu zopanda poizoni komanso zachilengedwe.Chinthu chachikulu ndikuwonetsetsa kwambiri, ndikuwunikira kwa 92%.Imodzi yokhala ndi kuwala kwabwino kwambiri, ma transmittance a UV amakhalanso mpaka 75%, ndipo zinthu za PMMA zilinso ndi kukhazikika kwamankhwala komanso kukana kwanyengo.

 

PMMA acrylic zipangizo nthawi zambiri ntchito ngati akiliriki mapepala, akiliriki pulasitiki pellets, akiliriki kuwala mabokosi, akiliriki bathbath, etc. The ntchito katundu wa munda magalimoto makamaka magetsi mchira, magetsi chizindikiro, mapanelo zida, etc., makampani mankhwala (kusungira magazi zotengera), ntchito zamafakitale (makanema ma disc, ma diffuser opepuka)), mabatani azinthu zamagetsi (makamaka zowonekera), zinthu zogula (makapu akumwa, zolembera, etc.).

 缩略图

The fluidity ya PMMA zakuthupi ndi zoipa kuposa PS ndi ABS, ndi kusungunuka mamasukidwe akayendedwe amakhudzidwa kwambiri kusintha kutentha.Mu ndondomeko akamaumba, jekeseni kutentha makamaka ntchito kusintha kusungunula mamasukidwe akayendedwe.PMMA ndi polima amorphous ndi kutentha kusungunuka kuposa 160 ℃ ndi kutentha kwa 270 ℃.Njira zopangira zida za PMMA zimaphatikizapo kuponyera,jekeseni akamaumba, Machining, thermoforming, etc.

 

1. Chithandizo cha mapulasitiki

PMMA imakhala ndi mayamwidwe ena amadzi, ndipo kuchuluka kwake kwa madzi ndi 0.3-0.4%, ndipo kutentha kwa jekeseni kuyenera kukhala pansi pa 0.1%, kawirikawiri 0.04%.Kukhalapo kwa madzi kumapangitsa kusungunuka kumawoneka ngati thovu, mikwingwirima ya gasi, ndikuchepetsa kuwonekera.Choncho iyenera kuumitsidwa.Kutentha kowuma ndi 80-90 ℃, ndipo nthawiyo ndi yoposa maola atatu.

Nthawi zina, 100% yazinthu zobwezerezedwanso zitha kugwiritsidwa ntchito.Ndalama zenizeni zimadalira zofunikira za khalidwe.Kawirikawiri, imatha kupitirira 30%.Zinthu zobwezerezedwanso ziyenera kupeŵa kuipitsidwa, apo ayi zidzakhudza kumveka bwino ndi katundu wa mankhwala omalizidwa.

2. Kusankha makina opangira jekeseni

PMMA ilibe zofunikira zapadera zamakina opangira jekeseni.Chifukwa cha kusungunuka kwake kwakukulu, chibowo chakuya chakuya ndi bowo lalikulu la nozzle zimafunikira.Ngati mphamvu ya chinthucho ikufunika kukhala yokwera, wononga ndi chiŵerengero chokulirapo chiyenera kugwiritsidwa ntchito papulasitiki yotsika kutentha.Kuphatikiza apo, PMMA iyenera kusungidwa mu hopper youma.

3. Mapangidwe a nkhungu ndi zipata

Kutentha kwa nkhungu-ken kungakhale 60 ℃-80 ℃.Kutalika kwa sprue kuyenera kufanana ndi taper yamkati.Ngodya yabwino kwambiri ndi 5° mpaka 7°.Ngati mukufuna kubaya 4mm kapena kupitilira apo, ngodya iyenera kukhala 7 °, ndipo m'mimba mwake mwa sprue iyenera kukhala 8 °.Kufikira 10mm, kutalika kwa chipata sikuyenera kupitirira 50mm.Pazinthu zokhala ndi khoma lochepera 4mm, m'mimba mwake wa othamanga ayenera kukhala 6-8mm, ndi zinthu zokhala ndi khoma lokulirapo kuposa 4mm, m'mimba mwake wothamanga ayenera kukhala 8-12mm.

Kuzama kwa zitseko zozungulira, zooneka ngati fan komanso zowoneka ngati ofukula ziyenera kukhala 0.7 mpaka 0.9t (t ndi makulidwe a khoma la mankhwala), ndipo m'mimba mwake wa chipata cha singano kuyenera kukhala 0.8 mpaka 2mm;kwa mamasukidwe otsika, kukula kocheperako kuyenera kugwiritsidwa ntchito.Mabowo olowera wamba ndi 0.05 mpaka 0.07mm kuya ndi 6mm m'lifupi.Malo otsetsereka ali pakati pa 30'-1 ° ndi 35'-1 ° 30 ° pachigawo chapakati.

4. Kutentha kwa kutentha

Itha kuyezedwa ndi njira ya jakisoni wa mpweya: kuyambira 210 ℃ mpaka 270 ℃, kutengera zomwe wapereka.

5. Kutentha kwa jekeseni

Jekeseni wothamanga angagwiritsidwe ntchito, koma kuti mupewe kupsinjika kwakukulu kwa mkati, jekeseni wamagulu ambiri ayenera kugwiritsidwa ntchito, monga pang'onopang'ono-wochepa, ndi zina zotero.

6. Nthawi yokhalamo

Ngati kutentha ndi 260 ℃, nthawi yokhalamo sayenera kupitirira mphindi 10, ndipo ngati kutentha ndi 270 ℃, nthawi yokhalamo sayenera kupitirira mphindi 8.


Nthawi yotumiza: May-25-2022

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