I-Polypropylene (PP) yi-thermoplastic "ipolymer eyongeziweyo" eyenziwe ngokudibanisa i-propylene monomers. Isetyenziswa kwizicelo ezahlukeneyo ukubandakanya ukupakishwa kweemveliso zabathengi, iinxalenye zeplastiki kumashishini ahlukeneyo kubandakanya umzi-mveliso weemoto, izixhobo ezikhethekileyo ezifana neehenjisi eziphilayo, kunye namalaphu.
1. Unyango lweeplastiki.
I-PP ecocekileyo i-translucent yendlovu emhlophe kwaye inokudaywa ngemibala eyahlukeneyo. Ukudaya kwePP, kuphela umbala we-masterbatch onokusetyenziswa ngokubanziisitofu sokubumbaoomatshini. Iimveliso ezisetyenziswa ngaphandle zizaliswe zizinzisi ze-UV kunye nekhabhoni emnyama. Umlinganiselo wokusetyenziswa kwezinto ezisetyenzisiweyo akufanele udlule i-15%, ngaphandle koko kuya kubangela ukuhla kwamandla kunye nokubola kunye nokuguqulwa kombala.
2. Ukukhethwa komatshini wokubumba inaliti
Kuba iPP inobukhazikhazi obuphezulu. Umatshini wokubumba inaliti yekhompyuter enoxinzelelo oluphezulu lwenaliti kunye nolawulo lwamanqanaba amaninzi luyafuneka. I-clamping force inqunywe ngokubanzi kwi-3800t / m2, kwaye umthamo we-injection yi-20% -85%.
3. Uyilo lokungunda kunye nesango
Iqondo lobushushu lokungunda yi 50-90℃, kwaye ubushushu obuphezulu bokungunda busetyenziselwa iimfuno zobukhulu obuphezulu. Ubushushu obuphambili bungaphezulu kwe-5℃ ngaphantsi kobushushu bomgodi, i-diameter yembaleki yi-4-7mm, ubude besango lenaliti yi-1-1.5mm, kwaye ububanzi bunokuba buncinci njenge-0.7mm. Ubude besango lomphetho bufutshane ngokusemandleni, malunga ne-0.7mm, ubunzulu buyisiqingatha sobunzima bodonga, kwaye ububanzi buphindwe kabini ubuninzi bodonga, kwaye buya kunyuka ngokuthe ngcembe kunye nobude be-melt flow in the cavity. Umngundo kufuneka ube nomoya olungileyo. Umngxuma wokukhupha umoya yi-0.025mm-0.038mm ubunzulu kunye ne-1.5mm ubukhulu. Ukuze ugweme amanqaku okunciphisa, sebenzisa i-nozzle enkulu kunye ejikelezileyo kunye nomgijimi ojikelezayo, kwaye ubukhulu beembambo kufuneka bube buncinci. Ubunzima beemveliso ezenziwe nge-homopolymer PP abukwazi ukudlula i-3mm, ngaphandle koko kuya kuba namaqamza.
4. Ubushushu obunyibilikayo
Iqondo elinyibilikayo le-PP liyi-160-175 ° C, kwaye ukushisa kwe-decomposition yi-350 ° C, kodwa ukusetwa kweqondo lokushisa akukwazi ukudlula i-275 ° C ngexesha lokucubungula i-injection. Iqondo lobushushu lendawo yokunyibilika likhethwa ukuba libe ngama-240°C.
5. Isantya sokutofa
Ukuze kuncitshiswe uxinzelelo lwangaphakathi kunye ne-deformation, i-injection yesantya esiphezulu kufuneka ikhethwe, kodwa amanye amabakala e-PP kunye ne-molds ayifanelekanga. Ukuba umgangatho owenziweyo ubonakala unemigca ekhanyayo kunye nemnyama esasazwe ngesango, inaliti enesantya esisezantsi kunye nobushushu obuphezulu bokubumba kufuneka busetyenziswe.
6. Nyibilikisa i-adhesive back pressure
I-5bar melt adhesive back pressure ingasetyenziswa, kwaye uxinzelelo lwangemva lwento yetoner lunokulungelelaniswa ngokufanelekileyo.
7. Isitofu kunye nokugcina uxinzelelo
Sebenzisa uxinzelelo lwenaliti ephezulu (1500-1800bar) kunye nokubamba uxinzelelo (malunga ne-80% yoxinzelelo lwenaliti). Tshintshela ekubambeni uxinzelelo malunga ne-95% ye-stroke epheleleyo, kwaye usebenzise ixesha elide lokubamba.
8. Emva kokulungiswa kweemveliso
Ukuze uthintele ukucutheka kunye nokuguqulwa okubangelwa yi-post-crystallization, iimveliso ngokubanzi kufuneka zifakwe.d emanzini ashushu.
Ixesha lokuposa: Feb-25-2022
