Imathiriyeli ye-PMMA yaziwa ngokuqhelekileyo njenge-plexiglass, i-acrylic, njl. Igama lekhemikhali yi-polymethyl methacrylate. I-PMMA yinto engeyiyo ityhefu kunye nendalo engqongileyo. Olona phawu lukhulu kukukhanya okuphezulu, kunye nokuhanjiswa kokukhanya kwama-92%. Lowo uneempawu zokukhanya ezingcono kakhulu, i-UV transmittance nayo ifikelela kwi-75%, kunye nempahla ye-PMMA nayo inozinzo oluhle lweekhemikhali kunye nokumelana nemozulu.
PMMA izinto acrylic zidla ngokusetyenziswa njenge sheets acrylic, acrylic iipellets zeplastiki, iibhokisi ukukhanya acrylic, ibhafu acrylic, etc. Iimveliso zokugalela intsimi yeemoto ikakhulu izibane zemoto umsila, izibane umqondiso, iiphaneli izixhobo, njl, ishishini lamayeza (ugcino lwegazi izikhongozeli), usetyenziso lwemizi-mveliso (iidiski zevidiyo, izixhobo zokukhanyisa ukukhanya)), amaqhosha eemveliso zombane (ingakumbi ezibonisa elubala), iimpahla zabathengi (isiselo iikomityi, izinto zokubhala, njl. njl.).
I-fluidity yezinto ze-PMMA zibi kakhulu kune-PS kunye ne-ABS, kwaye i-viscosity enyibilikayo ivakalelwa ngakumbi kwiinguqu kwiqondo lokushisa. Kwinkqubo yokubumba, ubushushu benaliti busetyenziselwa ukutshintsha i-viscosity yokunyibilika. I-PMMA yipolima eyi-amorphous enobushushu obunyibilikayo obungaphezulu kwe-160℃ kunye nobushushu bokubola obungama-270℃. Iindlela zokubumba zezinto ze-PMMA ziquka ukuphosa,isitofu sokubumba, machining, thermoforming, njl.
1. Unyango lweeplastiki
I-PMMA ine-absorption ethile yamanzi, kwaye izinga lokufunxa kwamanzi li-0.3-0.4%, kwaye ukushisa kwe-injection yokubumba kufuneka kube ngaphantsi kwe-0.1%, ngokuqhelekileyo i-0.04%. Ubukho bamanzi benza ukuba ukunyibilika kubonakale njengamaqamza, imijelo yerhasi, kunye nokunciphisa ukungafihli. Ngoko kufuneka yomiswe. Ukushisa kokumisa yi-80-90 ℃, kwaye ixesha lingaphezu kweeyure ezi-3.
Kwezinye iimeko, i-100% yezinto ezisetyenzisiweyo zinokusetyenziswa. Eyona mali ixhomekeke kwiimfuno zomgangatho. Ngokuqhelekileyo, inokugqithisa i-30%. Izinto ezihlaziyiweyo kufuneka zigweme ukungcoliswa, ngaphandle koko kuya kuchaphazela ukucaca kunye neempawu zemveliso egqityiweyo.
2. Ukukhethwa komatshini wokubumba inaliti
I-PMMA ayinazo iimfuno ezikhethekileyo zoomatshini bokubumba inaliti. Ngenxa ye-viscosity ephezulu yokunyibilika kwayo, i-screw groove enzulu kunye nomngxuma wombhobho omkhulu uyafuneka. Ukuba amandla emveliso afunekayo ukuba abe phezulu, i-screw ene-aspect ratio enkulu kufuneka isetyenziswe kwi-plasticization yobushushu obuphantsi. Ukongeza, i-PMMA kufuneka igcinwe kwi-hopper eyomileyo.
3. Uyilo lokungunda kunye nesango
Ubushushu be-mold-ken bunokuba yi-60℃-80℃. Ububanzi be-sprue kufuneka buhambelane ne-taper yangaphakathi. Eyona engile ingcono yi-5° ukuya ku-7°. Ukuba ufuna ukufaka i-4mm okanye ngaphezulu kweemveliso, i-angle kufuneka ibe ngu-7 °, kwaye ububanzi be-sprue kufuneka bube yi-8 °. Ukuya kwi-10mm, ubude obubonke besango akufunekanga budlule kwi-50mm. Kwiimveliso ezinobunzima bodonga obungaphantsi kwe-4mm, ububanzi bembaleki kufuneka bube yi-6-8mm, kwaye kwiimveliso ezinodonga olungaphezulu kwe-4mm, ububanzi bembaleki kufuneka bube yi-8-12mm.
Ubunzulu be-diagonal, i-fan-shaped kunye ne-vertical-shaped gates kufuneka ibe yi-0.7 ukuya kwi-0.9t (t yindonga yodonga lwemveliso), kwaye ububanzi besango lenaliti kufuneka libe ngu-0.8 ukuya kwi-2mm; kwi-viscosity ephantsi, ubungakanani obuncinci kufuneka busetyenziswe. Imingxunya ye-vent eqhelekileyo yi-0.05 ukuya kwi-0.07mm ubunzulu kunye ne-6mm ububanzi.I-slope ye-demolding iphakathi kwe-30'-1 ° kunye ne-35'-1 ° 30 ° kwindawo yomgodi.
4. Ubushushu obunyibilikayo
Inokulinganiswa ngendlela yokutofa ngomoya: ukusuka kwi-210℃ ukuya kwi-270℃, kuxhomekeke kulwazi olunikwe ngumthengisi.
5. Iqondo lokushisa lokutofa
Inaliti ekhawulezayo ingasetyenziswa, kodwa ukunqanda uxinezeleko oluphezulu lwangaphakathi, inaliti enezigaba ezininzi kufuneka isetyenziswe, efana nesantya esicothayo-esicothayo, njl.njl. Xa utofa iindawo ezishinyeneyo, sebenzisa isantya esicothayo.
6. Ixesha lokuhlala
Ukuba iqondo lokushisa ngu-260 ℃, ixesha lokuhlala akufanele lidlule imizuzu eyi-10 kakhulu, kwaye ukuba iqondo lokushisa li-270 ℃, ixesha lokuhlala alifanele lidlule imizuzu eyi-8.
Ixesha lokuposa: May-25-2022
