PMMA zvinhu zvinowanzozivikanwa se plexiglass, acrylic, etc. Zita remakemikari inonzi polymethyl methacrylate. PMMA isiri-chepfu uye inoshamwaridzana zvinhu. Chinhu chikuru ndechekujeka kwepamusoro, nechiedza chekufambisa che92%. Iyo ine yakanakisa mwenje zvivakwa, iyo UV transmittance zvakare inosvika 75%, uye iyo PMMA zvinhu zvakare ine yakanaka kugadzikana kwemakemikari uye kuramba kwemamiriro ekunze.
PMMA acrylic zvinhu zvinowanzo shandiswa se acrylic sheets, acrylic plastic pellets, acrylic light boxes, acrylic bathtubs, etc. Zvigadzirwa zvekushandisa zvemunda wemotokari zvinonyanya mwenje wemota yemuswe, marambi echiratidzo, mapaneru emidziyo, nezvimwewo, indasitiri yemishonga (kuchengetera ropa. midziyo), maindasitiri ekushandisa (mavhidhiyo discs, light diffuser)), mabhatani ezvigadzirwa zvemagetsi (kunyanya pachena), zvinhu zvevatengi (zvinwiwa makapu, zvinyorwa, nezvimwewo).
Iyo fluidity yePMMA zvinhu yakaipisisa kupfuura iyo yePS uye ABS, uye iyo melt viscosity inonyanya kunzwisiswa nekuchinja kwekushisa. Mukuita kuumbwa, tembiricha yejekiseni inonyanya kushandiswa kushandura iyo melt viscosity. PMMA iamorphous polima ine tembiricha yekunyunguduka inodarika 160 ℃ uye tembiricha yekuora inosvika 270 ℃. Nzira dzekuumba dzePMMA zvinhu dzinosanganisira kukanda,jekiseni kuumba, machining, thermoforming, nezvimwe.
1. Kurapa kwepurasitiki
PMMA ine kumwe kunyura kwemvura, uye chiyero chemvura chayo 0.3-0.4%, uye tembiricha yekuumba jekiseni inofanira kunge iri pasi pe0.1%, kazhinji 0.04%. Kuvapo kwemvura kunoita kuti kunyungudika kuite semafuru, gasi mitsetse, uye kuderedza kujeka. Saka inoda kuomeswa. Iyo yekuomesa tembiricha ndeye 80-90 ℃, uye nguva inopfuura maawa matatu.
Mune zvimwe zviitiko, 100% yezvinhu zvakadzokororwa zvinogona kushandiswa. Mari chaiyo inobva pane zvinodiwa zvehutano. Kazhinji, inogona kudarika 30%. Iyo yakadzokororwa zvinhu inofanira kudzivirira kusvibiswa, kana zvisina kudaro ichakanganisa kujekesa uye maitiro echigadzirwa chakapedzwa.
2. Kusarudzwa kwejekiseni molding machine
PMMA haina zvakakosha zvinodiwa zvemajekiseni ekuumba michina. Nekuda kwehupamhi hwekunyungudika kwayo, yakadzika screw groove uye yakakura dhayamita nozzle gomba inodiwa. Kana kusimba kwechigadzirwa kuchidikanwa kuve kwakakwira, sikururu ine yakakura chikamu ratio inofanira kushandiswa kune yakaderera-tembiricha plasticization. Mukuwedzera, PMMA inofanira kuchengetwa muhopi yakaoma.
3. Mold uye gedhi kugadzira
Iyo mold-ken tembiricha inogona kuva 60 ℃-80 ℃. Iyo dhayamita yesprue inofanira kufanana nemukati taper. Kona yakanaka i5° kusvika 7°. Kana iwe uchida kupinza 4mm kana kupfuura zvigadzirwa, kona inofanira kuva 7 °, uye dhayamita yesprue inofanira kuva 8 °. Kusvika 10mm, kureba kwegedhi hakufaniri kudarika 50mm. Kune zvigadzirwa zvine ukomba hwemadziro zvisingasviki 4mm, iyo mumhanyi dhayamita inofanira kunge iri 6-8mm, uye kune zvigadzirwa zvine madziro ukobvu kupfuura 4mm, iyo mumhanyi dhayamita inofanira kuva 8-12mm.
Kudzika kwemasuo ane diagonal, fan-shaped uye vertical-shaped gedhi inofanira kuva 0.7 kusvika 0.9t (t ndiyo rusvingo rwechigadzirwa), uye dhayamita yegedhi retsono inofanira kuva 0.8 kusvika 2mm; kune yakaderera viscosity, saizi diki inofanira kushandiswa. Makomba akajairika ari 0.05 kusvika 0.07mm kudzika uye 6mm yakafara.The demolding slope is between 30'-1° and 35'-1°30° in the cavity part.
4. Kunyunguduka kwekushisa
Inogona kuyerwa nenzira yejekiseni remhepo: kubva pa210 ℃ kusvika 270 ℃, zvichienderana neruzivo rwunopihwa nemutengesi.
5. Jekiseni tembiricha
Rapid jekiseni rinogona kushandiswa, asi kuti udzivise kushushikana kwakanyanya kwemukati, jekiseni rematanho akawanda rinofanira kushandiswa, sekunonoka-kukurumidza-kunonoka, etc. Kana uchibaya majekiseni akakora, shandisa kukurumidza.
6. Nguva yekugara
Kana tembiricha iri 260 ℃, nguva yekugara haifanirwe kudarika maminetsi gumi zvakanyanya, uye kana tembiricha iri 270 ℃, nguva yekugara haifanirwe kudarika 8 maminetsi.
Nguva yekutumira: May-25-2022
