Polypropylene (PP) ndi "polima yowonjezera" ya thermoplastic yopangidwa kuchokera ku kuphatikiza kwa propylene monomers. Amagwiritsidwa ntchito m'njira zosiyanasiyana kuphatikiza kulongedza zinthu za ogula, zida zapulasitiki zamafakitale osiyanasiyana kuphatikiza mafakitale amagalimoto, zida zapadera monga ma hinge amoyo, ndi nsalu.
1. Chithandizo cha mapulasitiki.
Pure PP ndi yoyera yoyera ndipo imatha kupakidwa utoto wamitundu yosiyanasiyana. Pa utoto wa PP, masterbatch amtundu okhawo angagwiritsidwe ntchito pazambirijekeseni akamaumbamakina. Zinthu zomwe zimagwiritsidwa ntchito panja nthawi zambiri zimadzazidwa ndi ma UV stabilizers ndi carbon black. Kugwiritsa ntchito chiŵerengero cha zipangizo zobwezerezedwanso sikuyenera kupitirira 15%, apo ayi kungayambitse kutsika kwa mphamvu ndi kuwonongeka ndi kusinthika.
2. Kusankha makina opangira jekeseni
Chifukwa PP ili ndi crystallinity yapamwamba. Makina opangira jakisoni apakompyuta omwe ali ndi kuthamanga kwambiri kwa jakisoni komanso kuwongolera masitepe ambiri ndikofunikira. Mphamvu ya clamping nthawi zambiri imatsimikiziridwa pa 3800t/m2, ndipo voliyumu ya jakisoni ndi 20% -85%.
3. Mapangidwe a nkhungu ndi zipata
Kutentha kwa nkhungu ndi 50-90 ℃, ndipo kutentha kwa nkhungu kumagwiritsidwa ntchito pazofunikira zazikuluzikulu. Kutentha kwapakati ndi 5 ℃ kutsika kuposa kutentha kwa patsekeke, m'mimba mwake wothamanga ndi 4-7mm, kutalika kwa chipata cha singano ndi 1-1.5mm, ndipo m'mimba mwake amatha kukhala ochepa ngati 0.7mm. Kutalika kwa chipata cha m'mphepete ndi kochepa kwambiri, pafupifupi 0.7mm, kuya ndi theka la makulidwe a khoma, ndipo m'lifupi mwake ndi kawiri makulidwe a khoma, ndipo pang'onopang'ono adzawonjezeka ndi kutalika kwa kusungunuka kwa madzi muzitsulo. Nkhungu iyenera kukhala ndi mpweya wabwino. Bowo lolowera ndi 0.025mm-0.038mm kuya ndi 1.5mm wandiweyani. Kuti mupewe zizindikiro za kuchepa, gwiritsani ntchito phokoso lalikulu ndi lozungulira ndi wothamanga wozungulira, ndipo makulidwe a nthiti ayenera kukhala ochepa. Makulidwe azinthu zopangidwa ndi homopolymer PP sizingadutse 3mm, apo ayi padzakhala thovu.
4. Kutentha kwa kutentha
Malo osungunuka a PP ndi 160-175 ° C, ndipo kutentha kwa kuwonongeka ndi 350 ° C, koma kutentha sikungathe kupitirira 275 ° C panthawi ya jekeseni. Kutentha kwa malo osungunuka bwino ndi 240 ° C.
5. Kuthamanga kwa jekeseni
Kuti muchepetse kupsinjika kwamkati ndi kusinthika, jekeseni wothamanga kwambiri ayenera kusankhidwa, koma magiredi ena a PP ndi nkhungu sizoyenera. Ngati malo opangidwa ndi mawonekedwe akuwoneka ndi mikwingwirima yowala komanso yakuda yofalikira ndi chipata, jekeseni wocheperako komanso kutentha kwa nkhungu kwapamwamba kuyenera kugwiritsidwa ntchito.
6. Sungunulani zomatira kumbuyo kuthamanga
5bar melt adhesive back pressure ingagwiritsidwe ntchito, ndipo kukakamiza kumbuyo kwa zinthu za tona kumatha kusinthidwa moyenera.
7. Kusunga jekeseni ndi kukakamiza
Gwiritsani ntchito kuthamanga kwambiri kwa jakisoni (1500-1800bar) ndikugwira mwamphamvu (pafupifupi 80% ya kuthamanga kwa jakisoni). Sinthani pakugwira kukakamiza pafupifupi 95% ya sitiroko yonse, ndipo gwiritsani ntchito nthawi yayitali yogwira.
8. Pambuyo pokonza zinthu
Pofuna kupewa shrinkage ndi mapindikidwe omwe amayamba chifukwa cha post-crystallization, zinthuzo nthawi zambiri zimayenera kunyowa.d m'madzi otentha.
Nthawi yotumiza: Feb-25-2022
