Nzira yekuwedzera uremu (constant weight loading method) ndeimwe yenzira dzinowanzoshandiswa dzekuyedza melt flow rate instruments (MFR)–YYP-400E;
Chinhu chikuru cheiyi nzira ndeyekuisa mutoro usingachinji papurasitiki yakanyungudutswa uchishandisa huremu hwakatarwa, wobva wayera huremu hwechinhu chakanyungudutswa chinoyerera nepakati pedhishi yakajairwa panguva yakatarwa yekuverenga mwero wekuyerera. Zvakanakira zvayo zvinonyanya kuratidzwa muzvinhu zvakawanda zvakaita sekushanda, kururama, kushanda, uye mutengo. Zvinhu zvinotevera:
1. Maitiro ekushanda ari nyore uye akajeka, uye akajeka. Nzira yehuremu humwe chete inoda chete magadzirirwo ehuremu hwakatarwa uye haidi michina yakaoma yekuchinja mutoro. Munguva yekuedza, ingopisa sampuro kuti inyungudike, isa huremu hwakatarwa, isa nguva, uye unganidza zvinhu zvakanyungudutswa zvinoyerera. Matanho acho mashoma uye kurongeka kwakakwira, nehunyanzvi hushoma hwevashandisi, uye inogona kukurumidza kugadziriswa uye kudzokororwa. Kana ichienzaniswa nenzira yekuchinja mutoro (yakadai seyero yehuwandu hwehuwandu hwemvura inonyunguduka yeMVR), inobvisa kudiwa kwekutsiva huremu uye kugadzirisa mitoro, zvichideredza zvakanyanya nguva yekugadzirira bvunzo imwe chete.
2. Data rekuyedza rakagadzikana zvikuru uye chikanganiso chinogona kudzorwa. Kana zvinhu zvakanyungudutswa zvichirema, kumanikidzwa kwesimbi kunoramba kuripo, mwero wekuyerera kwemvura wakafanana, uye kuchinja-chinja kwehuwandu hwezvinhu zvakanyungudutswa zvakaunganidzwa kudiki, zvichikonzera kudzokororwa kwakanaka kweMFR. Kururama kwehuremu hwemhando yepamusoro kunogona kudzorwa zvakanyanya kuburikidza nekuongororwa (nekurongeka kwe±0.1g), kudzivirira zvikanganiso zvekuwedzera zvinokonzerwa nekusanganiswa kwehuremu uye kutumirwa kwemagetsi nenzira yemutoro unoshanduka. Izvi zvinonyanya kukodzera kuyedzwa kwakanyatsojeka kwepurasitiki inoyerera zvishoma (senge PC, PA) kana purasitiki inoyerera zvakanyanya (senge PE, PP).
3. Chimiro chemidziyo chakareruka, mutengo wakaderera, uye kugadzirisa kuri nyore. Chishandiso cheMFR chinoshandisa nzira yehuremu humwe chete hachidi sisitimu yakaoma yekugadzirisa mutoro (senge kurodha kwemagetsi, kuchengetedza huremu), uye michina yacho idiki muhukuru, ine zvikamu zvishoma, zvichikonzera mutengo wekutenga wakaderera ne20% kusvika 40% zvichienzaniswa nemidziyo yemhando dzakasiyana-siyana. Kugadzirisa kwezuva nezuva kunoda chete kuyera huremu hwehuremu, kuchenesa die nebarrel, uye hapana kugadziriswa kwesystem yekutumira kana yekudzora kunodiwa. Kukundikana kwakaderera, kutenderera kwekugadzirisa kwakareba, uye kwakakodzera kuongororwa kwemhando yenguva dzose mumakambani madiki nepakati kana marabhoritari.
4. Inoenderana nezvinodiwa zvakajairwa uye yakakodzera kuongororwa kwemhando yepamusoro. Nzira yehuremu humwe chete inosangana zvizere nezvinodiwa nezvinodiwa nezvinodiwa nemakambani makuru akadai seISO 1133-1 neASTM D1238, uye inzira yakajairika yekuongorora zvinhu zvepurasitiki uye kutonga kwemhando yekugadzirwa. Pakuongorora mapurasitiki mazhinji (akadai sePE, PP, PS) mufekitori, mutoro wakajairwa chete (wakadai se2.16kg, 5kg) ndiwo unodiwa kuti bvunzo ipedzwe, pasina chikonzero chekuwedzera kugadziriswa kweparameter, uye yakakodzera zvinodiwa nekuongorora kwemhando yepamusoro mumaindasitiri.
5. Mhedzisiro yedata iri nyore kunzwisisa uye nechinangwa chekuenzanisa. Mhedzisiro yebvunzo inoratidzwa zvakananga mu "g/10min" units, uye saizi yenhamba inoratidza zvakananga kuyerera kwezvinhu zvakanyungudutswa, zvichiita kuti zvive nyore kuita kuenzanisa kwakatwasuka pakati pemabhechi akasiyana nevagadziri vakasiyana vezvinhu zvakagadziriswa. Semuenzaniso: kune imwe mhando yePP raw material, kana MFR yebhechi A iri 2.5g/10min uye iyo yebhechi B iri 2.3g/10min, zvinogona kutongwa zvakananga kuti batch A ine kuyerera kuri nani, pasina chikonzero chekushandura kwakaoma kana kugadzirisa data.
Zvinofanira kucherechedzwa kuti muganhu wemhando imwe chete uri mukusakwanisa kwayo kuyera kutsamira kwehuwandu hwekunyunguduka kwesimbi. Kana munhu achida kudzidza hunhu hwe rheological hwepurasitiki pasi pemitoro yakasiyana, chishandiso cheMVR chine mitoro yakawanda kana capillary rheometer chinofanira kushandiswa pamwe chete.
Nguva yekutumira: Zvita-13-2025