Magani ga matsalolin da aka shafa foda akan zafi tsoma galvanizing

1. Maganin da bai cika ba:

• polyester foda shafi foda resins ne na thermosetting wanda ke ƙetare hanyar haɗin gwiwa zuwa nau'in halitta na ƙarshe ta hanyar kiyaye shi a zazzabi (yawanci 180 o C), na kusan mintuna 10. An tsara tanda don samar da wannan lokacin a yanayin zafi. Tare da abubuwa na galvanized mai zafi mai zafi, tare da kauri mai nauyi, ya zama dole don tabbatar da cewa an ba da izinin isasshen lokacin stoving don saduwa da ƙayyadaddun magani. Kafin yin dumama aikin da ya fi nauyi zai taimaka wajen hanzarta aikin warkewa a cikin tanda mai warkewa.

2. Rashin mannewa:

• Mataki na ƙarshe a cikin tsarin galvanizing mai zafi ya haɗa da kashe ruwa na aikin, akai-akai a cikin raunin sodium dichromate bayani. Wannan tsari yana sanyaya aikin ta yadda za'a iya sarrafa shi kuma yana wuce saman murfin galvanized don hana iskar oxygen da wuri na saman. Kasancewar fim ɗin wucewa a saman rufin galvanized zai tsoma baki tare da zinc phosphate ko baƙin ƙarfe phosphate pretreatment, kuma a yawancin lokuta, waɗannan magunguna ba su da tasiri. Yana da mahimmanci kada a kashe abubuwa masu zafi na galvanized bayan galvanizing. Wannan yana tabbatar da cewa saman tutiya yana cikin yanayin haɓakawa sosai don karɓar pretreatment da aka yi amfani da shi a cikin tsarin suturar foda.

3. Tsagewa:

• Pinholing yana faruwa ne ta hanyar samar da ƙananan kumfa na iskar gas a cikin rufin polyester yayin zagayowar dafawa/warkewa. Wadannan kumfa suna samar da ƙananan raƙuman ruwa a saman kuma ba su da kyau. Babban dalilin fil holing ya bayyana shine cewa ƙwayoyin polyester mai hankali a cikin hulɗa tare da galvanized karfe surface ba sa fuse a lokaci guda kamar yadda wadanda suke a saman polyester foda. fim, saboda yawan tarin galvanized karfe , da kuma lokacin da aka dauka don ya zo har zuwa yanayin zafi.
• An ƙera resins na musamman tare da ma'aikatan 'degassing' don rage wannan matsala ta hanyar jinkirta fara haɗuwa da foda. Pre-dumama aikin a cikin tanda pre-zafi kafin foda aikace-aikace damar da zafi tsoma galvanized sassan da za a foda mai rufi da magance matsalar fil holing lokacin amfani da tare da 'degassing' maki na polyester foda shafi.