Kodi ndi mfundo ziti zofunika kuziganizira mukamapanga jakisoni wa PP?

Chiyambi: Monga imodzi mwamapulasitiki omwe amagwiritsidwa ntchito kwambiri, PP imatha kuwoneka paliponse pamoyo watsiku ndi tsiku.Ili ndi chiyero chapamwamba kuposa pc wamba.Ngakhale ilibe utoto wapamwamba wa ABS, PP ili ndi chiyero chapamwamba komanso kumasulira kwamitundu.M'makampani, zinthu za PP nthawi zambiri zimagwiritsidwa ntchito popanga zinthu mongamabotolo apulasitiki, zipewa za botolo, botolo zonona, ndi zina zoteroRB PACKAGEndi kugawana ndi supply chain kuti mufotokozere:

5207D2E9-28F9-4458-A8B9-B9B9D8DC21EC

Dzina la mankhwala: Polypropylene

Dzina la Chingerezi: Polypropylene (wotchedwa PP)

PP ndi crystalline polima.Pakati pa mapulasitiki omwe amagwiritsidwa ntchito kwambiri, PP ndiyopepuka kwambiri, yokhala ndi kachulukidwe ka 0.91g/cm3 yokha (yosachepera madzi).Pakati pa mapulasitiki opangidwa ndi cholinga chambiri, PP ili ndi kukana kutentha kwambiri.Kutentha kwake kosokoneza kutentha ndi 80-100 ° C ndipo akhoza kuwiritsidwa m'madzi otentha.PP imakhala ndi kukana kupsinjika kwamphamvu komanso kutopa kwambiri.Amadziwika kuti "100% pulasitiki".Ntchito yonse ya PP ndiyabwino kuposa yazinthu za PE.Zogulitsa za PP zimakhala ndi kulemera kopepuka, kulimba kwabwino komanso kukana mankhwala abwino.

Zoyipa za PP: kulondola kwapang'onopang'ono, kukhazikika kosakwanira, kukana kwanyengo, kosavuta kutulutsa "kuwonongeka kwa mkuwa", kumakhala ndi zochitika zapambuyo-shrinkage, pambuyo pobowola, ndizosavuta kukalamba, zimakhala zolimba, komanso zosavuta kupunduka.

01
Kuumba makhalidwe
1) Zinthu za crystalline zimakhala ndi hygroscopicity yochepa ndipo zimakhala zosavuta kusungunuka, ndipo zimakhala zosavuta kuwola pokhudzana ndi nthawi yayitali ndi zitsulo zotentha.

2) The fluidity ndi zabwino, koma shrinkage osiyanasiyana ndi shrinkage mtengo ndi lalikulu, ndi shrinkage mabowo, mano, ndi mapindikidwe n'zosavuta kuchitika.

3) Kuthamanga kwa kuzizira kumakhala kofulumira, kutsanulira ndi dongosolo lozizira liyenera kutaya kutentha pang'onopang'ono, ndipo tcherani khutu pakuwongolera kutentha.Kutentha kwa zinthu kumakhala kosavuta kulunjika pa kutentha kochepa komanso kuthamanga kwambiri.Pamene nkhungu kutentha ndi otsika kuposa madigiri 50, mbali pulasitiki si yosalala, ndipo n'zosavuta kubala osauka kuwotcherera, zizindikiro otaya, sachedwa warping ndi mapindikidwe pamwamba 90 madigiri.

4) Makulidwe a khoma la pulasitiki ayenera kukhala ofanana kuti apewe kusowa kwa guluu ndi ngodya zakuthwa kuti mupewe kupsinjika.

02
Makhalidwe a ndondomeko
PP imakhala ndi madzi abwino pa kutentha kosungunuka komanso kugwira ntchito bwino.PP ali ndi makhalidwe awiri pokonza

Choyamba: Kukhuthala kwa PP kusungunuka kumachepa kwambiri ndi kuchuluka kwa kukameta ubweya wa ubweya (zosakhudzidwa ndi kutentha)

Chachiwiri: Mlingo wa momwe mamolekyu amayendera ndi okwera ndipo kuchuluka kwa kuchepa kumakhala kwakukulu. 

Kutentha kwa PP ndi kuzungulira 200-300 ℃.Ili ndi kukhazikika kwamafuta abwino (kutentha kowola ndi 310 ℃), koma kutentha kwambiri (270-300 ℃), imatha kutsika ngati ikhala mumgolo kwa nthawi yayitali.Chifukwa kukhuthala kwa PP kumachepa kwambiri ndi kuchuluka kwa liwiro la kukameta ubweya, kuwonjezereka kwa kuthamanga kwa jakisoni ndi kuthamanga kwa jakisoni kumawonjezera madzi ake ndikuwongolera kupunduka kwa shrinkage ndi kukhumudwa.Kutentha kwa nkhungu kuyenera kuyendetsedwa mkati mwa 30-50 ℃.Kusungunuka kwa PP kumatha kudutsa mumpata wopapatiza wa nkhungu ndikuwonekera kutsogolo.Pakusungunuka kwa PP, imayenera kuyamwa kutentha kwakukulu kwa fusion (kutentha kwakukulu kwapadera), ndipo mankhwalawa ndi otentha atatulutsidwa mu nkhungu.Zinthu za PP siziyenera kuwumitsidwa panthawi yokonza, ndipo kuchuluka kwa shrinkage ndi crystallinity ya PP ndizotsika kuposa za PE. 

03
Mfundo zofunika kuzidziwa pokonza pulasitiki
Pulasitiki processing

Pure PP ndi yoyera yoyera ndipo imatha kupakidwa utoto wamitundu yosiyanasiyana.PP imatha kupakidwa utoto ndi mtundu wa masterbatch pamakina omangira jakisoni wamba, koma mitundu ina imakhala ndi zinthu zodziyimira pawokha zapulasitiki zomwe zimalimbitsa kusanganikirana, ndipo zimathanso kupakidwa utoto ndi tona.

Zinthu zomwe zimagwiritsidwa ntchito panja nthawi zambiri zimadzazidwa ndi zolimbitsa thupi za UV ndi carbon black.Kugwiritsa ntchito chiŵerengero cha zinthu zobwezerezedwanso sikuyenera kupitirira 15%, apo ayi kungayambitse kutsika kwa mphamvu ndi kuwonongeka ndi kusinthika.Nthawi zambiri, palibe chithandizo chapadera chowumitsa chomwe chimafunikira musanagwiritse ntchito jakisoni wa PP.

Kusankha makina opangira jekeseni

Palibe zofunikira zapadera pakusankha 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 ndi 3800t/m2, ndipo voliyumu ya jakisoni ndi 20% -85%.

注塑车间

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 mwake ndi kochepa kwambiri, pafupifupi 0.7mm, kuya ndi theka la makulidwe a khoma, ndipo m'lifupi mwake ndi kawiri kukula kwa khoma, ndipo pang'onopang'ono kumawonjezeka ndi kutalika kwa kusungunuka kwachitsulo muzitsulo.

Nkhungu iyenera kukhala ndi mpweya wabwino.Bowo lolowera ndi 0.025mm-0.038mm kuya ndi 1.5mm wandiweyani.Pofuna kupewa zizindikiro za kuchepa, gwiritsani ntchito ma nozzles akuluakulu ndi ozungulira ndi othamanga ozungulira, ndipo makulidwe a nthiti ayenera kukhala ochepa (Mwachitsanzo, 50-60% ya makulidwe a khoma).

Makulidwe a mankhwala opangidwa ndi homopolymer PP sayenera upambana 3mm, apo ayi padzakhala thovu (wandiweyani khoma mankhwala akhoza kugwiritsa ntchito copolymer PP).

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 mu gawo losungunuka ndi bwino 240 ° C.

Kuthamanga kwa jekeseni

Pofuna kuchepetsa kupsinjika kwamkati ndi kusinthika, jekeseni wothamanga kwambiri ayenera kusankhidwa, koma ma PP ena ndi nkhungu sizoyenera (thovu ndi mizere ya mpweya mu chovala chaumunthu).Ngati malo opangidwa ndi mawonekedwe akuwoneka ndi mikwingwirima yowala komanso yakuda yofalikira ndi chipata, jekeseni wocheperako komanso kutentha kwa nkhungu kwapamwamba kuyenera kugwiritsidwa ntchito.

Sungunulani kumbuyo kuthamanga

5bar melt adhesive back pressure ingagwiritsidwe ntchito, ndipo kukakamiza kumbuyo kwa zinthu za tona kumatha kusinthidwa moyenera. 

Jekeseni ndi kukakamiza kugwira

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.

Pambuyo pokonza zinthu

Pofuna kupewa shrinkage ndi mapindikidwe obwera chifukwa cha post-crystallization, zinthuzo nthawi zambiri zimafunika kuviikidwa m'madzi otentha.

Malingaliro a kampani Shanghai Rainbow Industrial Co., Ltdndiye wopanga,Shanghai utawaleza phukusiPerekani zopangira zodzikongoletsera zokhazokha.Ngati mumakonda katundu wathu, mungatheLumikizanani nafe,
Webusaiti:www.rainbow-pkg.com
Imelo:Bobby@rainbow-pkg.com
WhatsApp: +008613818823743


Nthawi yotumiza: Oct-04-2021
Lowani