Kugula zinthu zolongedza | Momwe mungasankhire zinthu zapamwamba za payipi yapulasitiki

Kusankha ndi ubwino wa zipangizo ndizofunikira kwambiri kuti mapayipi akhale abwino, zomwe zidzakhudza mwachindunji ntchito yokonza ndi kugwiritsa ntchito mapayipi komaliza. Zipangizo za mapayipi apulasitiki zikuphatikizapo polyethylene (ya thupi la chubu ndi mutu wa chubu), polypropylene (chivundikiro cha chubu), masterbatch, barrier resin, inki yosindikizira, varnish, ndi zina zotero. Chifukwa chake, kusankha kwa zipangizo zilizonse kudzakhudza mwachindunji ubwino wa payipi. Komabe, kusankha zipangizo kumadaliranso pazinthu monga zofunikira zaukhondo, zinthu zotchinga (zofunikira za mpweya, nthunzi ya madzi, kusunga fungo lonunkhira, ndi zina zotero), komanso kukana mankhwala.

Kusankha mapaipi: Choyamba, zipangizo zomwe zimagwiritsidwa ntchito ziyenera kukwaniritsa miyezo yoyenera ya ukhondo, ndipo zinthu zovulaza monga zitsulo zolemera ndi zinthu zowunikira ziyenera kulamulidwa mkati mwa mlingo wofunikira. Mwachitsanzo, pa mapaipi otumizidwa ku United States, polyethylene (PE) ndi polypropylene (PP) zomwe zimagwiritsidwa ntchito ziyenera kukwaniritsa muyezo wa US Food and Drug Administration (FDA) 21CFR117.1520.

Kapangidwe ka zinthu zotchinga: Ngati zomwe zili mu phukusi la makampani opanga mankhwala tsiku ndi tsiku ndi zinthu zina zomwe zimakhudzidwa kwambiri ndi mpweya (monga zodzoladzola zina zoyera) kapena fungo lake ndi losasinthasintha (monga mafuta ofunikira kapena mafuta ena, ma acid, mchere ndi mankhwala ena owononga), machubu opangidwa ndi zigawo zisanu ayenera kugwiritsidwa ntchito panthawiyi. Chifukwa mpweya wolowa m'chubu chopangidwa ndi zigawo zisanu (polyethylene/adhesive resin/EVOH/adhesive resin/polyethylene) ndi mayunitsi 0.2-1.2, pomwe mpweya wolowa m'chubu chodziwika bwino cha polyethylene single-layer ndi mayunitsi 150-300. Munthawi inayake, kuchuluka kwa kulemera kwa chubu chopangidwa ndi ethanol kumakhala kotsika kambirimbiri kuposa kwa chubu chopangidwa ndi zigawo chimodzi. Kuphatikiza apo, EVOH ndi ethylene-vinyl alcohol copolymer yokhala ndi zotchinga zabwino kwambiri komanso kusunga fungo (kukhuthala kwa ma microns 15-20 ndiye kwabwino kwambiri).

Kuuma kwa zinthu: Makampani opanga mankhwala tsiku ndi tsiku ali ndi zofunikira zosiyanasiyana pakuuma kwa mapaipi, ndiye mungapeze bwanji kuuma komwe mukufuna? Polyethylene yomwe imagwiritsidwa ntchito kwambiri m'mapaipi ndi polyethylene yotsika kwambiri, polyethylene yotsika kwambiri, ndi polyethylene yotsika kwambiri. Pakati pawo, kuuma kwa polyethylene yotsika kwambiri ndikwabwino kuposa kwa polyethylene yotsika kwambiri, kotero kuuma komwe mukufunako kumatha kuchitika posintha chiŵerengero cha polyethylene yotsika kwambiri/polyethylene yotsika kwambiri.

Kukana mankhwala: Polyethylene yochuluka kwambiri imakhala ndi kukana kwabwino kwa mankhwala kuposa polyethylene yocheperako.

Kukana kwa zinthu pa nyengo: Kuti muwongolere magwiridwe antchito a payipi kwa kanthawi kochepa kapena kwa nthawi yayitali, zinthu monga mawonekedwe, kukana kupanikizika/kutsika kwa mpweya, mphamvu yotsekera, kukana kupsinjika kwa chilengedwe (mtengo wa ESCR), fungo labwino ndi kutayika kwa zosakaniza zogwira ntchito ziyenera kuganiziridwa.

Kusankha masterbatch: Masterbatch imagwira ntchito yofunika kwambiri pakuwongolera khalidwe la payipi. Chifukwa chake, posankha masterbatch, kampani yogwiritsa ntchito iyenera kuganizira ngati ili ndi kufalikira kwabwino, kusefa ndi kukhazikika kwa kutentha, kukana nyengo komanso kukana mankhwala. Pakati pawo, kukana kwa mankhwala a masterbatch ndikofunikira kwambiri panthawi yogwiritsa ntchito payipi. Ngati masterbatch sigwirizana ndi mankhwalawo, mtundu wa masterbatch udzasamukira ku chinthucho, ndipo zotsatira zake zimakhala zoopsa kwambiri. Chifukwa chake, makampani opanga mankhwala tsiku ndi tsiku ayenera kuyesa kukhazikika kwa zinthu zatsopano ndi mapayipi (mayeso ofulumira pansi pa mikhalidwe yodziwika).

Mitundu ya varnish ndi makhalidwe awo: Varnish yomwe imagwiritsidwa ntchito mu payipi imagawidwa m'mitundu ya UV ndi mtundu wa kuuma kwa kutentha, ndipo imatha kugawidwa m'mitundu yowala komanso yopanda matte malinga ndi mawonekedwe. Varnish sikuti imangopereka mawonekedwe okongola, komanso imateteza zomwe zili mkati mwake ndipo imakhala ndi zotsatira zina zoletsa mpweya, nthunzi yamadzi ndi fungo labwino. Kawirikawiri, varnish youma kutentha imakhala yogwirizana bwino ndi kupopera kotentha komanso kusindikiza kwa silk-screen, pomwe varnish ya UV imakhala ndi kuwala kwabwino. Makampani opanga mankhwala tsiku ndi tsiku amatha kusankha varnish yoyenera malinga ndi mawonekedwe a zinthu zawo. Kuphatikiza apo, varnish yotsukidwa iyenera kukhala yomata bwino, malo osalala opanda mabowo, osagwirizana ndi kupindika, osagwirizana ndi kuwonongeka, osagwirizana ndi dzimbiri, komanso osasintha mtundu panthawi yosungira.

Zofunikira pa thupi la chubu/mutu wa chubu: 1. Pamwamba pa thupi la chubu payenera kukhala kosalala, popanda mikwingwirima, mikwingwirima, kupsinjika, kapena kusokonekera kwa kufupika. Thupi la chubu liyenera kukhala lolunjika komanso losapindika. Kukhuthala kwa khoma la chubu kuyenera kukhala kofanana. Kukhuthala kwa khoma la chubu, kutalika kwa chubu, ndi kukula kwake kuyenera kukhala mkati mwa mulingo womwe watchulidwa;

2. Mutu wa chubu ndi thupi la chubu la payipi ziyenera kulumikizidwa bwino, mzere wolumikizira uyenera kukhala wosalala komanso wokongola, ndipo m'lifupi uyenera kukhala wofanana. Mutu wa chubu uyenera kusanjidwa bwino mutalumikiza; 3. Mutu wa chubu ndi chivundikiro cha chubu ziyenera kugwirizana bwino, kulowa ndi kutuluka bwino, ndipo pasakhale kutsetsereka mkati mwa torque yodziwika, ndipo pasakhale kutuluka kwa madzi kapena mpweya pakati pa chubu ndi chivundikiro;

Zofunikira pakusindikiza: Kukonza mapaipi nthawi zambiri kumagwiritsa ntchito kusindikiza kwa lithographic offset (OFFSET), ndipo inki yambiri yomwe imagwiritsidwa ntchito imakhala youma ndi UV, zomwe nthawi zambiri zimafuna kumamatira mwamphamvu komanso kukana kusintha kwa mtundu. Mtundu wosindikiza uyenera kukhala mkati mwa mulingo wofunikira, malo osindikizira ayenera kukhala olondola, kusiyana kuyenera kukhala mkati mwa 0.2mm, ndipo zilembo ziyenera kukhala zomveka bwino.

Zofunikira pa zipewa za pulasitiki: Zipewa za pulasitiki nthawi zambiri zimapangidwa ndi jekeseni ya polypropylene (PP). Zipewa za pulasitiki zapamwamba siziyenera kukhala ndi mizere yooneka bwino yocheperako komanso yowala, mizere yosalala ya nkhungu, kukula kolondola, komanso kugwirizana bwino ndi mutu wa chubu. Siziyenera kuyambitsa kuwonongeka kwa kapangidwe kake monga ming'alu yosweka kapena ming'alu panthawi yogwiritsidwa ntchito mwachizolowezi. Mwachitsanzo, mphamvu yotsegulira ikafika pamalo oyenera, chipewa chopindika chiyenera kukhala chotha kupirira mapindidwe opitilira 300 popanda kusweka.