Kune marudzi akawanda emapuranga epurasitiki ane huwandu hwakawanda hwekushandisa. Parizvino, mhando huru ndeye polyvinyl chloride, polystyrene uye polyester (PET). Pepa rePET rine kuita kwakanaka uye rinosangana nenyika yehutsanana indekisi inodiwa yezvigadzirwa zvakaumbwa uye zvepasirese kuchengetedzwa kwezvakatipoteredza zvinodiwa. Ivo ndevepatafura yekuchengetedza kwezvakatipoteredza. Parizvino, kurongedza kunoda kusangana nekuchengetedzwa kwezvakatipoteredza uye kudzokorodza zvinodiwa, saka kudiwa kwemapepa ePET kuri kuwedzera nekukwira. Ichi chinyorwa chinonyanya kukurukura maitiro ekugadzira uye matambudziko akajairika ePET mapepa.
PET sheet kugadzira tekinoroji:
(1) PET pepa
Kufanana nemamwe mapurasitiki, zvimiro zvePET sheet zvine hukama zvakanyanya nehuremu hwemamorekuru. Huremu hwemamorekuru hunotsanangurwa nemukati viscosity. Iyo yakakwirira iyo intrinsic viscosity, zviri nani zvemuviri uye makemikari ehupfumi, asi hurombo hunyoro uye kuoma mukuumba. Iyo yakaderera iyo intrinsic viscosity, iyo yakaipisisa yemuviri uye kemikari zvivakwa uye simba rekukanganisa. Naizvozvo, iyo intrinsic viscosity yePET sheet inofanirwa kunge iri 0.8dl/g-0.9dl/g.
(2) Nzira yekugadzira inoyerera
The mainzvigadzirwa zvekugadzira zvePET mapepainosanganisira crystallization shongwe, kuomesa shongwe, extruders, die heads, matatu-roll calenders uye coilers. Maitiro ekugadzira ndeaya: raw material crystallization-drying-extrusion plasticization-extrusion molding-calendering and shaping- winding products.
1. Crystallization. Iwo PET zvimedu zvinodziyirwa uye zvakakwenenzverwa mu crystallization tower kuti ienzanise mamorekuru, uyezve kuwedzera tembiricha yegirazi yezvimedu kudzivirira kunamatira uye kuvhara kwe hopper panguva yekuomesa. Crystallization kazhinji inhanho yakakosha. Crystallization inotora 30-90 maminetsi uye tembiricha iri pasi pe149 ° C.
2.Dry. Pakupisa kwepamusoro, mvura ichaita hydrolyze uye kushatisa PET, zvichikonzera kudzikiswa kwehunhu hwayo hwekunamatira, uye hunhu hwayo hwemuviri, kunyanya kusimba kwesimba, huchadzikira sezvo huremu hwemamorekuru hunodzikira. Nokudaro, isati yanyunguduka uye yakabuda, PET inofanira kuomeswa kuderedza unyoro hwemukati, hunofanira kunge huri pasi pe0.005%. Dehumidification dryer inoshandiswa pakuomesa. Nekuda kweiyo hygroscopicity yePET zvinhu, kana mvura ikapinda mukati mukati meiyo chimedu, ma molecular bonds anoumbwa, uye imwe chikamu chemvura inopinda mukati mechikamu, zvichiita kuti kuoma kuome. Naizvozvo, mhepo yakajairika inopisa haigone kushandiswa. Mhepo inopisa yedova inodiwa kuti ive yakaderera pane -40C, uye mhepo inopisa inopinda muhopi yekuomeswa kuburikidza nedunhu rakavharwa kuti rirambe richiomesa.
3. Kusvina. Mushure mekristaro uye kuomeswa, PET inoshandurwa kuita polima ine nzvimbo yekunyungudika iri pachena. Iyo tembiricha yekuumbwa kwepolymer yakakwira uye tembiricha yekudzora huwandu hwakatetepa. Iyo polyester-specific barrier screw inoshandiswa kuparadzanisa zvidimbu zvisina kunyunguduka kubva mukunyunguduka, izvo zvinobatsira kuchengetedza kureba kweshear process uye inowedzera kubuda kweiyo extruder. Adopts flexible lip die with streamlined throttle rod. Musoro we mold wakapetwa. Vamhanyi vakakwenenzverwa uye miromo isina kukwenya-yekufa inoratidza kuti kupera kunofanirwa kuve kwakanaka. Iyo mold heater ine drainage uye kuchenesa mabasa.
4.Kutonhora uye kuumba. Mushure mokunge kunyunguduka kwabuda mumusoro, inopinda zvakananga katatu-roll calender ye calendering uye kutonhora. Chinhambwe chiri pakati pematatu-roller calender uye musoro wemuchina unowanzo chengetwa paanenge 8cm, nekuti kana chinhambwe chakanyanya, bhodhi rinodonha nekuunyana zviri nyore, zvichikonzera kupera kwakashata. Mukuwedzera, nekuda kwechinhambwe chakareba, kupisa kupisa uye kutonhora kunononoka, uye kristaro inoshanduka chena, iyo isingakodzeri kukunguruka. Iyo matatu-roller calendering unit ine yepamusoro, yepakati uye yakaderera rollers. Iyo shaft yepakati roller inogadziriswa. Munguva yekutonhodza uye kuita calendering, roller surface tembiricha i40°c-50c. Iyo shaft yekumusoro uye yakaderera rollers inogona kufamba kumusoro uye pasi.
Nguva yekutumira: Sep-28-2023
