Plastic extrusion, senge UPVC (rigid polyvinyl chloride) profiles kana pombi zvigadzirwa, zvinonyanya kuumbwa kuburikidza nekusanganisa, extrusion process, kuumba, kuburitsa, uye kucheka kwePVC resin nezvimwe zvine hukama. Izvo zvinhu zvinokanganisa mashandiro ezvigadzirwa zvinovhara nhanho yega yega mukugadzira maitiro. Nhanho imwe neimwe inopindirana uye inobata mumwe nemumwe kuburikidza nenhepfenyuro yechigadzirwa. Dambudziko rimwe rinogona kubhadharwa nemamwe matanho mukati meimwe nhanho, saka nhanho imwe neimwe inova chipenyu. Pakati pazvo, zvigadzirwa, zvigadziriso zvekugadzira uye maitiro ekushanda ndizvo zvinhu zvikuru mupurasitiki extrusion process, iyo inokanganisa zvakananga kunaka uye kubuda kwe extrusion molding. Ichi chinyorwa chinotarisa pamhedzisiro ye extrusion kubva pakuona kwe extrusion midziyo uye mbishi zvinhu.
Kazhinji, PVCzvigadzirwa zvinoshandisa zvinotevera zvinowedzera kuita extrusion process:
1.PVC resin:
Polyvinyl chloride, inodaidzwa sePVC muChirungu, ndiyo yechitatu inogadzirwa polymer purasitiki pasi rose (mushure me polyethylene uye polypropylene). PVC yaimbove yaigadzirwa zvakanyanya-chinangwa mapurasitiki pasi rose uye yaishandiswa zvakanyanya. Kune marudzi maviri ePVC: yakaoma (dzimwe nguva yakapfupikiswa seRPVC) uye yakapfava. Rigid polyvinyl chloride inoshandiswa mukuvaka mapaipi, magonhi nemahwindo. Inoshandiswawo kugadzira mabhodhoro epurasitiki, kurongedza, kubhengi kana makadhi enhengo. Kuwedzera mapurasitiki anoita kuti PVC ive yakapfava uye yakawedzera elastic. Inogona kushandiswa mumapombi, kuvharwa kwetambo, pasi, zvikwangwani, marekodhi egiramufomu, zvigadzirwa zvinotapukira uye zvinotsiva rabha.
stabilizer:
Nekuda kwekuti PVC resin iresin inonzwa kupisa, inotanga kudzikisira kana tembiricha inosvika pa90 kusvika 130 ° C, ichiburitsa HCL isina kugadzikana uye zvichiita kuti resin iite yero. Sezvo tembiricha inokwira, ruvara rweresin runosviba uye zvemuviri & zvemakemikari zvimiro zvechigadzirwa zvinodzikira. Pamusoro pekuvandudza maitiro ekugadzira resin mbishi zvinhu, kugadzirisa dambudziko rekushatisa kunonyanya kusanganisira kuwedzera ma stabilizers kuPVC resin kutora uye kumisa gasi reHCL uye kubvisa iyo inokonzeresa kushatisa maitiro. Anowanzo shandiswa kudzikamisa masisitimu anosanganisira: lead salt, organotin, sipo dzesimbi uye zvisingawanzo pasi pasi stabilizers.
Mafuta (PE wax kana Parafini):
Imwe mhando yekuwedzera yekuvandudza lubricity uye kuderedza interface adhesion. Zvinoenderana nemabasa, iwo akakamurwa kuita ekunze mafuta, emukati mafuta uye emukati & ekunze lubricant. Iyo yekunze lubricant inogona kuderedza kukweshera pakati pechinhu uye nesimbi pamusoro kudzivirira iyo UPVC zvinhu kubva kunamira kune dhiramu uye screw mushure mepurasitiki. Iyo yemukati lubricant inogona kuderedza kupokana pakati pezvimedu mukati mechinhu, kunetesa kubatana pakati pemamorekuru uye kuderedza kunyungudika viscosity. Kushandiswa kwemafuta ekuzora kune kwakakosha kudzikisa screw load, kuderedza kupisa kweshear, uye kuwedzera extrusion kubuda. Kugadzirwa kwemafuta ekuzora mukugadzirisa kwakakosha zvikuru.
Kuzadza zvinhu:
Kuti uvandudze kuoma uye kuomarara kwezvigadzirwa, kuderedza deformation yechigadzirwa, uye kuderedza mitengo yezvigadzirwa, mafirita akadai seCaCO 3 anowanzowedzerwa mukugadzirwa kweUPVC zvigadzirwa.
Kugadzirisa Kugadzirisa (ACR):
Chinangwa chikuru ndechekuvandudza mashandiro ezvishandiso, kukurumidza kuita plasticization yePVC resin, uye kugadzirisa fluidity, deformation yekupisa uye kupenya kwepasi kwezvigadzirwa.
Impact modifier:
Chinangwa chikuru ndechekuvandudza maitiro ekupikisa kwezvigadzirwa, kuvandudza kuomarara kwezvigadzirwa, uye kuvandudza maitiro epurasitiki. Anowanzo shandiswa modifiers yeUPVC iCPE (chlorinated polyethylene) uye acrylate maitiro ekugadzirisa.
Iyo plasticizing dhizaini yepurasitiki extrusion midziyo uye pesvedzero yeformula zvinongedzo pairi:
Pane midziyo yakawanda yepurasitiki extrusion molding. Iwo makuru anoshandiswa kuburitsa UPVC zvigadzirwa zvakaomarara zvinopokana-kutenderera mapatya-screw extruderconical twin screw extruder. Izvi zvinotevera zvinonyanya kukurukura nezve plasticization dhizaini yeanowanzo shandiswa extruder yekuburitsa UPVC zvigadzirwa.
Counter-inotenderera conical twin-screw extruder:
Nguva yekutumira: Zvita-29-2023
