Polypropylene (PP) shine thermoplastic "ƙarin polymer" wanda aka yi daga haɗin propylene monomers. Ana amfani da shi a cikin aikace-aikace iri-iri don haɗawa da marufi don samfuran mabukaci, sassan filastik don masana'antu daban-daban ciki har da masana'antar kera motoci, na'urori na musamman kamar hinges na rayuwa, da masaku.
1. Maganin robobi.
Pure PP farar hauren giwa ne mai jujjuyawa kuma ana iya rina shi da launuka daban-daban. Don rini na PP, masterbatch launi kawai za'a iya amfani dashi akan gabaɗayaallura gyare-gyareinji. Kayayyakin da ake amfani da su a waje gabaɗaya suna cike da masu daidaita UV da baƙin carbon. Matsakaicin amfani da kayan da aka sake yin fa'ida bai kamata ya wuce 15% ba, in ba haka ba zai haifar da raguwar ƙarfi da bazuwar da canza launi.
2. Zaɓin na'urar gyare-gyaren allura
Saboda PP yana da babban crystallinity. Ana buƙatar injin yin gyare-gyaren allurar kwamfuta tare da matsananciyar allura da sarrafa matakai da yawa. Ƙarfin matsawa gabaɗaya ana ƙaddara a 3800t/m2, kuma ƙarar allurar shine 20% -85%.
3. Mold da ƙirar kofa
A mold zafin jiki ne 50-90 ℃, da kuma high mold zafin jiki da ake amfani da mafi girma size bukatun. Matsakaicin zafin jiki ya fi 5 ℃ ƙasa da zafin rami, diamita mai gudu shine 4-7mm, tsayin ƙofar allura shine 1-1.5mm, diamita na iya zama ƙarami kamar 0.7mm. Tsawon ƙofar gefen yana da gajere kamar yadda zai yiwu, kimanin 0.7mm, zurfin shine rabin kauri na bango, kuma nisa shine sau biyu na kauri na bango, kuma a hankali zai karu tare da tsawon narkewar ruwa a cikin rami. Dole ne mold ya sami iska mai kyau. Ramin huɗa yana da zurfin 0.025mm-0.038mm da kauri 1.5mm. Don guje wa alamar raguwa, yi amfani da bututun ƙarfe babba da zagaye da mai gudu madauwari, kuma kaurin haƙarƙari ya zama ƙanana. Kauri daga samfurori da aka yi da homopolymer PP ba zai iya wuce 3mm ba, in ba haka ba za a sami kumfa.
4. Narkewar zafin jiki
Matsakaicin narkewa na PP shine 160-175 ° C, kuma zafin jiki na lalacewa shine 350 ° C, amma yanayin zafin jiki ba zai iya wuce 275 ° C yayin sarrafa allura ba. Zazzabi na yankin narkewa ya fi dacewa 240 ° C.
5. Gudun allura
Don rage damuwa na ciki da nakasawa, ya kamata a zaɓi allura mai sauri, amma wasu maki na PP da molds ba su dace ba. Idan shimfidar tsari ta bayyana tare da haske da ratsan duhu da aka watsa ta hanyar ƙofar, ya kamata a yi amfani da allura mai ƙarancin sauri da zafin jiki mafi girma.
6. Narke mannewa matsa lamba na baya
Za a iya amfani da matsa lamba na 5bar narke mannewa, kuma ana iya daidaita matsa lamba na baya na kayan toner daidai.
7. Allura da matsa lamba
Yi amfani da matsa lamba mafi girma (1500-1800bar) da riƙe matsa lamba (kimanin 80% na matsa lamba na allura). Canja zuwa matsa lamba a kusan 95% na cikakken bugun jini, kuma yi amfani da lokaci mai tsayi.
8. Bayan sarrafa samfuran
Don hana raguwa da lalacewa ta hanyar post-crystallization, samfuran gabaɗaya suna buƙatar jiƙa.d cikin ruwan zafi.
Lokacin aikawa: Fabrairu-25-2022
