Impahla ye-PMMA ivamise ukwaziwa nge-plexiglass, i-acrylic, njll. Igama lekhemikhali yi-polymethyl methacrylate. I-PMMA iyimpahla engenabuthi futhi evumelana nemvelo. Isici esikhulu kunazo zonke ukukhanya okuphezulu, nokudluliswa kokukhanya okungama-92%. Le enezinto ezingcono kakhulu zokukhanya, ukudluliswa kwe-UV nakho kufika ku-75%, futhi impahla ye-PMMA iphinde ibe nokusimama okuhle kwamakhemikhali kanye nokumelana nesimo sezulu.
Izinto ze-PMMA acrylic zivame ukusetshenziswa njengamashidi e-acrylic, ama-pellets epulasitiki e-acrylic, amabhokisi okukhanya kwe-acrylic, obhavu be-acrylic, njll. Imikhiqizo esetshenziswayo yensimu yezimoto ikakhulukazi izibani zomsila wezimoto, izibani zesignali, amaphaneli amathuluzi, njll., imboni yezemithi (ukugcina igazi iziqukathi), izinhlelo zokusebenza zezimboni (amadiski evidiyo, ama-light diffuser)), izinkinobho zemikhiqizo kagesi (ikakhulukazi esobala), izimpahla zabathengi (isiphuzo izinkomishi, izinto zokubhala, njll.).
I-fluidity yezinto ze-PMMA zimbi kakhulu kune-PS ne-ABS, futhi i-viscosity encibilikayo izwela kakhulu ekushintsheni kwezinga lokushisa. Enqubweni yokubumba, izinga lokushisa lomjovo lisetshenziselwa kakhulu ukushintsha i-viscosity yokuncibilika. I-PMMA i-amorphous polymer enezinga lokushisa elincibilikayo elingaphezu kuka-160℃ kanye nezinga lokushisa lokubola elingu-270℃. Izindlela zokubumba zezinto ze-PMMA zifaka phakathi ukubunjwa,ukubumba umjovo, imishini, i-thermoforming, njll.
1. Ukwelashwa kwamapulasitiki
I-PMMA inokumuncwa okuthile kwamanzi, futhi izinga layo lokumunca amanzi liyi-0.3-0.4%, futhi izinga lokushisa lokubumba umjovo kufanele libe ngaphansi kuka-0.1%, ngokuvamile libe ngu-0.04%. Ukuba khona kwamanzi kwenza ukuncibilika kubonakale njengamabhamuza, imivimbo yegesi, futhi kunciphise ukubonakala. Ngakho idinga ukomiswa. Izinga lokushisa lokumisa lingama-80-90 ℃, futhi isikhathi singaphezu kwamahora ama-3.
Kwezinye izimo, u-100% wezinto ezigaywe kabusha zingasetshenziswa. Inani langempela lincike ezidingweni zekhwalithi. Ngokuvamile, ingadlula ama-30%. Izinto ezigaywe kabusha kufanele zigweme ukungcoliswa, ngaphandle kwalokho kuzothinta ukucaca kanye nezakhiwo zomkhiqizo oqediwe.
2. Ukukhethwa komshini wokubumba umjovo
I-PMMA ayinazo izidingo ezikhethekile zemishini yokubumba umjovo. Ngenxa ye-viscosity yayo ephezulu yokuncibilika, i-screw groove ejulile kanye nembobo yombobo yobubanzi obukhulu kuyadingeka. Uma amandla omkhiqizo edingeka ukuthi abe phezulu, isikulufu esine-aspect ratio enkulu kufanele sisetshenziselwe ukwenza ipulasitiki yezinga lokushisa eliphansi. Ngaphezu kwalokho, i-PMMA kumele igcinwe ku-hopper eyomile.
3. Isikhunta kanye nomklamo wesango
Izinga lokushisa le-mold-ken lingaba ngu-60℃-80℃. Ububanzi be-sprue kufanele buhambisane ne-taper yangaphakathi. I-engeli engcono kakhulu ngu-5° ukuya ku-7°. Uma ufuna ukujova imikhiqizo engu-4mm noma ngaphezulu, i-engeli kufanele ibe ngu-7°, kanti ububanzi be-sprue kufanele bube ngu-8°. Ku-10mm, ubude besango bubonke akumele budlule ku-50mm. Emikhiqizweni enokuqina kodonga ngaphansi kuka-4mm, ububanzi bomgijimi kufanele bube ngu-6-8mm, futhi emikhiqizweni enogqinsi olungaphezu kuka-4mm, ububanzi bomgijimi kufanele bube ngu-8-12mm.
Ukujula kwamasango ane-diagonal, amise okwefeni futhi amise ukuma kufanele kube ngu-0.7 kuya ku-0.9t (t ukushuba kodonga lomkhiqizo), futhi ububanzi besango yenaliti kufanele bube ngu-0.8 kuya ku-2mm; nge-viscosity ephansi, usayizi omncane kufanele usetshenziswe. Izimbobo zokungena ezivamile zingu-0.05 kuya ku-0.07mm ukushona no-6mm ububanzi.Umthambeka wokudilika uphakathi kuka-30’-1° no-35’-1°30° engxenyeni yomgodi.
4. Izinga lokushisa elincibilikayo
Ingalinganiswa ngendlela yomjovo womoya: ukusuka ku-210℃ ukuya ku-270℃, kuye ngolwazi olunikezwa umphakeli.
5. Izinga lokushisa lomjovo
Umjovo osheshayo ungasetshenziswa, kodwa ukuze ugweme ukucindezeleka okukhulu kwangaphakathi, umjovo wezigaba eziningi kufanele usetshenziswe, njengokunensa-okushesha kakhulu, njll. Uma ujova izingxenye eziwugqinsi, sebenzisa isivinini esinensayo.
6. Isikhathi sokuhlala
Uma izinga lokushisa lingu-260 ℃, isikhathi sokuhlala akufanele sidlule imizuzu eyi-10 kakhulu, futhi uma izinga lokushisa lingu-270 ℃, isikhathi sokuhlala akufanele sidlule imizuzu engu-8.
Isikhathi sokuthumela: May-25-2022
