Cov txheej txheem tsis sib txhuam cov ntaub ntawv (一)
Pressed plastics ua los ntawm cov txheej txheem qhuav qhuav thiab cov txheej txheem ntub dej feem ntau muaj ob txoj hauv kev thaum lawv nkag mus rau cov txheej txheem kub nias molding hauv qab no. Cov pwm kub stamping muaj tib yam (me me me) dawb paug, thiab tom qab ntawd muab qhov khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob lwm qhov yog ncaj qha ntxiv cov yas nias rau kub stamping pwm rau compression molding. Txawm hais tias tus txheej txheem txheej txheem, cov yas nias yuav tsum muaj qee yam txheej txheem kom nws tuaj yeem ua tau raws li cov txheej txheem ntawm cov yas nias hauv cov txheej txheem thermocompression. Kev ua haujlwm li qub, kev ua haujlwm ntau lawm, thiab tshwj xeeb tshaj yog cov khoom zoo yuav muaj kev cuam tshuam ncaj qha.
Cov txheej txheem kev ua haujlwm ntawm cov yas compression feem ntau suav nrog: kev kho ceev, cov ntsiab lus tsis hloov pauv, fluidity, fineness thiab uniformity, bulk ntom, compression npaum li cas, compaction thiab lwm yam.
1. Ceev ceev
Curing ceev, tseem hu ua hardening ceev, yog hais txog qhov ceev ntawm thermosetting resins los yog yas (xws li thermoplastic phenolic resins thiab thermosetting phenolic resins thiab lawv cov pressed plastics) hloov mus rau insoluble thiab insoluble xeev ntawm ib tug tej yam kub, feem ntau hais nyob rau hauv vib nas this yuav tsum tau. Lub curing ceev ntawm cov yas nias yuav tsum tau tswj nyob rau hauv ib tug tej yam ntau yam. Yog tias qhov curing ceev qeeb dhau lawm, lub sijhawm kho yuav ntev, thiab lub voj voog ntawm cov yas nias hauv kub nias pwm yuav ntev, thiab kev ua haujlwm ntau lawm yuav qis, uas yuav cuam tshuam rau cov zis ntawm cov txheej txheem kub kub. ; Yog hais tias qhov curing ceev ceev heev, cov yas nias yuav tsis muab sib npaug ntawm cov pwm nias. Nws puv tag nrho cov pwm kab noj hniav, thiab ua ntej nws tag nrho tsim, nws tsis tuaj yeem ntws los ntawm solidification, ua rau kev puas tsuaj rau cov khoom nias thiab ua cov khoom pov tseg. Kev kho ceev ntawm cov yas compression feem ntau yog nyob ntawm kev kho ceev ntawm phenolic resin nyob rau hauv compression yas tivthaiv. Yog li ntawd, qhov curing ceev ntawm cov yas nias yog cuam tshuam nrog cov hauv qab no:
(1) Lub degree ntawm polycondensation ntawm resin: lub degree ntawm polycondensation ntawm cov resin yog sib sib zog nqus thiab curing ceev yog ceev. Ntawm qhov tsis sib xws, qhov degree ntawm polycondensation ntawm cov resin yog tsawg, thiab kev kho ceev yog qeeb.
(2) Tus nqi ntawm kev kho tus neeg sawv cev (stabiliser): Rau cov thermoplastic phenolic resin, tus nqi ntawm cov tshuaj tua kab mob hexamethylenetetramine nce, thiab kev kho ceev nce; txwv tsis pub, qhov curing ceev qeeb.
2. Liquidity
Lub fluidity ntawm cov yas txhais tau tias nws muaj peev xwm sau cov pwm kab noj hniav nyob rau hauv tej yam kub thiab siab tej yam kev mob. Compressed plastics nrog ib txwm fluidity tuaj yeem sau cov pwm kab noj hniav kom zoo los ntawm kev faib tawm raws li cov txheej txheem nias (kub, siab), thiab tau txais cov khoom zoo molded. Compressed plastics nrog fluidity tsawg dhau tsis tuaj yeem sau tag nrho cov kab noj hniav raws li cov txheej txheem nias. Yog li ntawd, cov khoom siv hauv cov ntsiav tshuaj compressed muaj qhov tsis xws luag xws li trachoma, cov npoo uas ploj lawm, cov ces kaum uas ploj lawm, qhov chaw dawb, cov qauv xoob, thiab lub zog tsis zoo, yog li cov khoom tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua thiab ua cov khoom tsis zoo thiab cov khoom pov tseg. Rau nyias-walled los yog cov khoom loj nrog cov duab nyuaj, txawm tias cov duab xav tau tsis tuaj yeem tau. Los yog qhov ntom ntawm cov khoom ntawm cov khoom tsis sib xws, lub zog siv tshuab tsis sib xws, thiab qhov zoo yog txo.
Raws li cov txheej txheem nias, uas yog, nyob rau hauv qee qhov kub thiab txias hauv chav tsev, qhov fluidity ntawm cov yas nias yog nyob ntawm cov hauv qab no:
(1) Resin fluidity, fluidity yog qhov taw qhia tseem ceeb ntawm cov khoom siv cob.
(2) Qhov sib piv ntawm cov nplaum nplaum (nrog rau cov resin thiab roj hmab), qhov nce ntawm cov nplaum nplaum hauv cov yas nias yuav pab txhim kho cov dej ntws ntawm cov yas nias.
(3) Cov ntsiab lus tsis hloov pauv, thaum cov ntsiab lus tsis hloov pauv tau qis dua 3 feem pua, cov dej ntws ntawm cov txheej txheem ntub dej luv-fiber pressed plastics yuav tsis zoo.
