Thepa le likarolo tsa ts'ebetso ea ho bopa ente ea polasetiki li angoa ke lintlha tse ngata. Li-plastiki tse fapaneng li hloka ho etsa liparamente tsa ho etsa tse loketseng thepa ea tsona e le hore li fumane thepa e ntle ka ho fetisisa ea mochine.
Lintlha tsa ho bopa ente ke tse latelang:
E 'ngoe, sekhahla sa ho fokotseha
Lintlha tse amang shrinkage ea polasetiki ea thermoplastic ke tse latelang:
1.Mefuta ea li-plastiki
| NO. | Plastikilebitso | SkhitlaRjele |
| 1 | PA66 | 1%–2% |
| 2 | PA6 | 1%–1.5% |
| 3 | PA612 | 0.5%–2% |
| 4 | PBT | 1.5%–2.8% |
| 5 | PC | 0.1%–0.2% |
| 6 | POM | 2%–3.5% |
| 7 | PP | 1.8%–2.5% |
| 8 | PS | 0.4%–0.7% |
| 9 | PVC | 0.2%–0.6% |
| 10 | ABS | 0.4%–0.5% |
2.Boholo le sebopeho sa hlobo ea ho bopa. Botenya bo feteletseng ba lerako kapa mokhoa o fokolang oa ho pholisa o ka ama shrinkage. Ho phaella moo, ho ba teng kapa ho se be teng ha ho kenya le ho hlophisoa le bongata ba ho kenya ho ama ka ho toba tataiso ea phallo, kabo ea bongata le ho hanyetsa ho fokotseha.
3.Sebopeho, boholo le kabo ea molomo oa thepa. Lintlha tsena li ama ka ho toba tataiso ea phallo ea thepa, kabo ea letsoalo, ho tšoara khatello le phello ea shrinkage le ho theha nako.
4.Mold mocheso le khatello ea ente.
Mocheso oa hlobo o phahame, sekhahla sa ho qhibiliha se phahame, sekhahla sa shrinkage sa polasetiki se phahame, haholo-holo polasetiki e nang le crystallinity e phahameng. Kabo ea mocheso le ho lumellana ha sekhahla sa likarolo tsa polasetiki le tsona li ama ka ho toba ho fokotseha le tataiso.
Ho boloka khatello le nako ea nako ho boetse ho na le phello ho khohlano. Khatello e phahameng, nako e telele e tla fokotseha empa tataiso e kholo. Ka hona, ha mocheso oa hlobo, khatello, lebelo la ho bopa ente le nako ea ho pholisa le lintlha tse ling le tsona li ka ba tse loketseng ho fetola shrinkage ea likarolo tsa polasetiki.
Hlobo moralo ho ea ka mefuta e fapaneng ya polasetiki shrinkage mefuta e fapaneng, polasetiki lebota botenya, sebopeho, fepa inlet foromo ya boholo le kabo, ho ea ka phihlelo ho fumana shrinkage ea karolo ka 'ngoe ea polasetiki, ebe ho bala cavity boholo.
Bakeng sa likarolo tsa polasetiki tse nepahetseng haholo 'me ho thata ho utloisisa sekhahla sa shrinkage, ka kakaretso ho loketse ho sebelisa mekhoa e latelang ho rala hlobo:
a) Nka shrinkage e nyane ea likarolo tsa polasetiki ka bophara ba kantle le ho honyela ho hoholo e le hore ho be le sebaka sa ho fetoloa kamora tlhahlobo ea hlobo.
b) Teko ea hlobo ho fumana hore na mokhoa oa ho lahla, boholo le maemo a ho theha.
c) Phetoho ea boholo ba likarolo tsa polasetiki tse lokelang ho sebetsoa hape e khethoa ka mor'a ho etsoa hape (tekanyo e tlameha ho ba lihora tse 24 kamora ho hlobolisoa).
d) Fetola hlobo ho latela shrinkage ea 'nete.
e) Lefu le ka lekoa hape mme boleng ba shrinkage bo ka fetoloa hanyane ka ho fetola maemo a ts'ebetso ka nepo ho fihlela litlhoko tsa likarolo tsa polasetiki.
Ea bobeli,Mokelikeli
- The fluidity ea thermoplastics hangata e hlahlojoa ke letoto la li-index tse kang boima ba molek'hule, melt index, Archimedes spiral flow length, viscosity ea ts'ebetso le tekanyo ea phallo (bolelele ba phallo / botenya ba lerako la polasetiki). Bakeng sa li-plastiki tsa lebitso le le leng, litlhaloso li tlameha ho hlahlojoa ho fumana hore na mokelikeli oa tsona o loketse ho etsoa ha ente.
Ho latela litlhoko tsa moralo oa hlobo, metsi a polasetiki a sebelisoang hangata a ka aroloa ka mekhahlelo e meraro:
a) Mokelikeli o motle oa PA, PE, PS, PP, CA le polymethylthyretinoene;
b) Letoto le bohareng la polystyrene resin (joalo ka AS ABS, AS), PMMA, POM, polyphenyl ether;
c) PC ea metsi e fokolang, PVC e thata, polyphenyl ether, polysulfone, polyaromatic sulfone, polasetiki ea fluorine.
- The fluidity ea li-plastiki tse fapa-fapaneng le tsona lia fetoha ka lebaka la lintho tse sa tšoaneng tse bōpang. Lintlha tse ka sehloohong tse susumetsang ke tse latelang:
a) Mocheso. Mocheso o phahameng oa thepa o tla eketsa mokelikeli, empa li-plastiki tse fapaneng le tsona li fapane, PS (haholo-holo ho hanyetsa ho hanyetsa le boleng bo phahameng ba MFR), PP, PA, PMMA, ABS, PC, CA polasetiki ea lichelete e nang le phetoho ea mocheso. Bakeng sa PE, POM, joale ho eketseha ha mocheso le ho fokotseha ha ho na tšusumetso e fokolang ho boleng ba bona.
b) Khatello. Khatello ea ho bopa ka ente e eketsa ho qhibiliha ka ketso ea ho kuta, metsi a boetse a eketseha, haholo-holo PE, POM e na le kutloelo-bohloko, kahoo nako ea khatello ea ho bopa ente ho laola phallo.
c) Sebopeho sa lefu. Tse kang ho tšela mokhoa oa tsamaiso, boholo, sebopeho, tsamaiso ea ho pholisa, tsamaiso ea ho qeta le lintlha tse ling ka ho toba li ama phallo ea sebele ea lintho tse entsoeng ka ho qhibilihisoa ka har'a cavity.
Moqapi oa hlobo o lokela ho thehoa holim'a tšebeliso ea phallo ea polasetiki, khetha sebopeho se utloahalang.Mould e ka boela ea laola mocheso oa thepa, mocheso oa hlobo le khatello ea ente, lebelo la ente le lintlha tse ling ho lokisa ho tlatsa hantle ho finyella litlhoko tsa ho bōpa.
Nako ea poso: 29-10-21