Chifukwa chiyani pulasitiki yoyera imasanduka yachikasu pakapita nthawi yayitali?

Nthawi zambiri, chikasu cha zinthu zapulasitiki chimayamba chifukwa cha kukalamba kapena kuwonongeka kwa zinthu.Nthawi zambiri,PPamayamba chifukwa cha ukalamba (kuwonongeka).Chifukwa cha kukhalapo kwa magulu a mbali pa polypropylene, kukhazikika kwake sikuli bwino, makamaka pa kuwala.Nthawi zambiri, stabilizer yowala imawonjezeredwa.KomaPE, popeza palibe maziko ammbali, palibe milandu yambiri yachikasu pakukonza kapena kugwiritsa ntchito koyambirira.Zithunzi za PVCidzasanduka yachikasu, yomwe imagwirizana kwambiri ndi ndondomeko ya mankhwala.Kunena mosabisa, ndi okosijeni.Pamwamba pa masterbatches ena ndi osavuta oxidized, choncho m`pofunika kuchita pamwamba mankhwala pa masterbatches.

Kuphatikiza pazowonjezera zoyipa ndi zonyansa m'dongosolo, ndikuganiza kuti zimayamba chifukwa cha ukalamba.Kuonjezera machitidwe abwino a antioxidant ndi anti ultraviolet agents amatha kusintha chikasu cha PE ndi PP, koma ambiri omwe amalepheretsa phenolic antioxidant machitidwe okha amabweretsa chikasu pang'ono.Kuphatikiza apo, machitidwe ena a antioxidant ndi anti ultraviolet agents ali ndi zotsatira zotsutsa, choncho samalani mukamagwiritsa ntchito.Mafuta a polima amawonjezedwa kuti apange filimu yotulutsa polima ya fluoropolymer pakhoma la makina, kuwongolera magwiridwe antchito a extrusion, kuthamanga kwa extrusion ndi kutentha kwa kutentha kwa utomoni wa polyolefin, kupititsa patsogolo malonda ndi zokolola, kuchepetsa ndalama zopangira, kuchepetsa kapena kuthetsa kusweka kwa zinyalala, ndi kuchepetsa zinyalala. mlingo.

1. Pali zinthu zopangira zomwe zimatchedwa plasticizer muzinthu zapulasitiki, zomwe makamaka zimagwira ntchito yotsutsa kukalamba, koma zidzasungunuka mumlengalenga, kotero pamene pulasitiki imachepetsedwa, mtunduwo udzazimiririka, ndipo kusungunuka kwa pulasitiki kudzachepanso. , zomwe zidzapangitsa kuti zikhale zowonongeka ndi zachikasu.

2. Kutsekemera kwachikasu kwa mabokosi apulasitiki pambuyo popanga kapena kugwiritsidwa ntchito kwa nthawi yaitali chifukwa cha kukalamba kwa zipangizo zomwe zimagwiritsidwa ntchito, kapena zikhoza kupangidwa pambuyo powonongeka.Chochitika chovuta kwambiri ndi mabokosi apulasitiki oyera, monga mabokosi ogulitsira oyera ndi migolo yapulasitiki.

3. Chifukwa chofala ndi kukalamba kwa zinthu zapulasitiki.Chifukwa chake ndi chakuti polypropylene ili ndi kuwukira m'mwamba.Kukhazikika kwake sikwabwino kwambiri, makamaka pankhani ya kuyanika kwa nthawi yayitali.

4. Choncho, kuti mapulasitiki oyera akhale nthawi yaitali, yesetsani kupewa kuwala kwamphamvu.Ngati zikugwirizana ndi chakudya, yesani kugwiritsa ntchito mapulasitiki owonekera komanso opanda mtundu.Ngati mukufuna kuthetsa chodabwitsa ichi, mukhoza kuwonjezera kuchuluka kwa stabilizer yosalala.