PP polypropylene
Mhando dzekushandisa dzakajairika:
Indasitiri yemotokari (kunyanya kushandisa zvinowedzerwa zvesimbi zvine PP: madhaka emugodhi, machubhu emhepo, mafeni, nezvimwewo), midziyo yemagetsi (machubhu emuchina wekugezesa ndiro, machubhu emhepo anoomesa, mafuremu emuchina wekugezesa, machubhu emuchina wefriji, nezvimwewo), Japan Shandisa zvinhu zvevatengi (midziyo yehuswa neyebindu yakaita se
Michina yekucheka uswa nemidziyo yekupfapfaidza, nezvimwewo).
Maitiro ejekiseni muforoma:
Kuomesa: Kana zvachengetwa zvakanaka, hapana mushonga wekuomesa unodiwa.
Kupisa kwekunyunguduka: 220~275℃, chenjerera kuti usapfuure 275℃.
Kupisa kwechikohwe: 40~80℃, 50℃ zvinokurudzirwa. Mwero wekuita kristalllization unonyanya kutsanangurwa nekupisa kwechikohwe.
Kumanikidzwa kwejekiseni: kusvika 1800bar.
Kumhanya kwejekiseni: Kazhinji, kushandisa jekiseni rinomhanya kunogona kuderedza kumanikidzwa kwemukati kusvika padiki. Kana paine zvikanganiso pamusoro pechigadzirwa, jekiseni rinomhanya zvishoma patembiricha yakakwira rinofanira kushandiswa.
Magedhi eRunners: Kune vanomhanya vanotonhora, dhayamita yerunners inowanzo shandiswa i4 ~ 7mm. Zvinokurudzirwa kushandisa denderedzwa reinjection port uye runner. Mhando dzese dzegedhi dzinogona kushandiswa. Dhayamita yegedhi yakajairika inotangira pa1 kusvika 1.5mm, asi magedhi madiki se0.7mm anogona kushandiswawo. Kune vanomhanya, kudzika kwegedhi kunofanira kunge kuri hafu yeukobvu hwemadziro; hupamhi hwegedhi hunofanira kunge huri kaviri ukobvu hwemadziro. PP material inogona kushandisa hot runner system.
Hunhu hwemakemikari uye hwemuviri:
PP chinhu chine semi-crystalline. Chakaoma kupfuura PE uye chine poindi yekunyunguduka yakakwira. Sezvo homopolymer PP isinganyanyi kusimba kana tembiricha yakakwira kupfuura 0°C, zvinhu zvakawanda zvePP zvekutengeserana zvinoitwa copolymers dzisina kurongeka dzine 1 kusvika 4% ethylene kana clamp copolymers dzine ethylene yakawanda. Copolymer PP zvinhu zvine tembiricha yakaderera yekukanganiswa kwekupisa (100°C), kujeka kwakaderera, kupenya kwakaderera, kuomarara kwakaderera, asi zvine simba rakasimba rekukanganisa. Simba rePP rinowedzera nekuwedzera kwe ethylene. Tembiricha yekunyorovesa yeVicat yePP i150°C. Nekuda kwekristaro yakakwira, kuomarara kwepamusoro uye kuramba kukwenya kwezvinhu izvi zvakanaka kwazvo. PP haina dambudziko rekupwanyika kwekumanikidzwa kwezvakatipoteredza. Kazhinji, PP inogadziriswa nekuwedzera girazi fiber, zvinowedzerwa zvesimbi kana rabha yethermoplastic. Mwero wekuyerera kweMFR yePP unobva pa1 kusvika ku40. Zvinhu zvePP zvine MFR yakaderera zvine resistance iri nani yekukanganisa asi simba rakaderera rekureba. Kune zvinhu zvine MFR imwechete, simba remhando ye copolymer rakakwirira kupfuura remhando ye homopolymer. Nekuda kwekuita makristaro, mwero wekupwanya kwePP wakakwira zvakanyanya, kazhinji 1.8 ~ 2.5%. Uye kufanana kwedivi rekupwanya kuri nani kupfuura kwePE-HD nezvimwe zvinhu. Kuwedzera 30% yekuwedzera kwegirazi kunogona kuderedza kupwanya kusvika 0.7%. Zvese zvinhu zvePP zve homopolymer ne copolymer zvine hunyoro hwakanaka, zvinodzivirira acid ne alkali corrosion, uye zvinodzivirira kunyungudika. Zvisinei, hazvina hunhu hwe aromatic hydrocarbons (senge benzene) solvents, chlorinated hydrocarbons (carbon tetrachloride) solvents, nezvimwewo. PP haina hunhu hwe oxidation pakupisa kwakanyanya sePE.

Yeduzvipunu zvepurasitiki, machubhu ekuyedza epurasitiki, zvinofema mhinonezvimwe zvigadzirwa zvinosangana nemuviri wemunhu zvinoshandisa zvinhu zvePP. Tine zvinhu zvePP zvemhando yekurapa uye zvinhu zvePP zvemhando yekudya. Nekuti zvinhu zvePP hazvina chepfu.