Poganizira kuchuluka kwa zosankha zomwe zilipo, kusankha thumba lapulasitiki loyenera kungakhale ntchito yovuta.Izi ndichifukwa choti matumba apulasitiki amapangidwa kuchokera kuzinthu zosiyanasiyana ndipo chilichonse mwazinthu izi chimapatsa ogwiritsa ntchito mawonekedwe ake.Zimabweranso m'mawonekedwe ndi mitundu yosiyanasiyana.
Pali mitundu yambiri ya matumba apulasitiki kunja uko, komabe, podziwa mtundu uliwonse, mukhoza kuchepetsa zosankha zanu kwambiri ndikusankha chikwama choyenera pazosowa zanu.Chifukwa chake, tiyeni tilowe mkati ndikuwona mitundu yosiyanasiyana yamatumba apulasitiki omwe akupezeka pamsika lero:
High Density Polyethylene (HDPE)
Imodzi mwa mapulasitiki omwe amagwiritsidwa ntchito kwambiri padziko lonse lapansi, HDPE imakhala ndi makhalidwe osiyanasiyana, omwe amachititsa kuti ikhale yabwino kwambiri popanga matumba apulasitiki.Ndi yopepuka, yowoneka bwino, yosamva madzi ndi kutentha, ndipo ili ndi mphamvu zolimba kwambiri.
Kupatula apo, matumba apulasitiki a HDPE amakumana ndi malangizo a USDA ndi FDA osamalira chakudya, motero amawapanga kukhala chisankho chodziwika bwino pakusunga ndikupereka chakudya potengera ndi kugulitsa.
Matumba apulasitiki a HDPE atha kupezeka m'malesitilanti, m'masitolo osavuta, m'malo ogulitsa zakudya, zophikira komanso ngakhale m'nyumba zosungirako ndikuyika.HDPE imagwiritsidwanso ntchito ngati matumba a zinyalala, zikwama zothandizira, matumba a T-sheti, ndi zikwama zochapira, pakati pa ena.
Low Density Polyethylene (LDPE)
Pulasitiki yamtunduwu imagwiritsidwa ntchito kwambiri ngati matumba, zikwama zazakudya, matumba a mkate komanso matumba okhala ndi mphamvu zochepa komanso zotambasula.Ngakhale LDPE ilibe mphamvu ngati matumba a HDPE, amatha kusunga zinthu zambiri, makamaka zakudya ndi nyama.
Kuphatikiza apo, pulasitiki yowoneka bwino imapangitsa kuti zikhale zosavuta kuzindikira zomwe zili mkati, zomwe zimapangitsa kuti malo odyera azikhala okhazikika m'makhitchini amalonda.
Izi zati, matumba apulasitiki a LDPE ndi osinthika kwambiri ndipo ndi otchuka kuti agwiritsidwe ntchito ndi kusindikiza kutentha chifukwa cha kutsika kwawo kosungunuka.LDPE imakumananso ndi malangizo a USDA ndi FDA okhudza chakudya komanso nthawi zina amagwiritsidwa ntchito kupanga kukulunga.
Linear Low Density Polyethylene (LLDPE)
Kusiyana kwakukulu pakati pa matumba apulasitiki a LDPE ndi LLDPE ndikuti chomalizacho chimakhala ndi choyezera chocheperako pang'ono.Komabe, chinthu chabwino kwambiri pa pulasitiki iyi palibe kusiyana kwa mphamvu, zomwe zimalola ogwiritsa ntchito kusunga ndalama popanda kusokoneza khalidwe.
Matumba a LLDPE amawonekera momveka bwino ndipo amagwiritsidwa ntchito popanga matumba a chakudya, matumba a nyuzipepala, matumba ogulira zinthu komanso matumba otaya zinyalala.Atha kugwiritsidwanso ntchito posungira chakudya m'mafiriji ndi mafiriji, chifukwa chake amagwiritsidwa ntchito posungira zakudya zambiri m'makhitchini amalonda.
Medium Density Polyethylene (MDPE)
MDPE ndi yomveka bwino poyerekeza ndi HDPE, koma osati momveka bwino ngati polyethylene yotsika kwambiri.Matumba omwe amapangidwa ndi MDPE samalumikizidwa ndi mphamvu yayikulu, komanso samatambasula bwino, motero samakonda kunyamula kapena kusunga zinthu zambiri.
Komabe, MDPE ndi chinthu chodziwika bwino pamatumba otaya zinyalala ndipo nthawi zambiri amagwiritsidwa ntchito popakira ogula pazinthu zamapepala monga mapepala a toiler kapena matawulo amapepala.
Polypropylene (PP)
Matumba a PP amadziwika ndi mphamvu zawo zamagetsi komanso kukana.Mosiyana ndi matumba ena, matumba a polypropylene sangapume ndipo ndi abwino kwa malo ogulitsa chifukwa chokhala ndi nthawi yayitali.PP imagwiritsidwanso ntchito popanga zakudya, pomwe zinthu monga maswiti, mtedza, zitsamba ndi zokometsera zina zitha kusungidwa mosavuta m'matumba opangidwa kuchokera pamenepo.
Matumbawa ndi omveka bwino poyerekeza ndi ena, zomwe zimapangitsa kuti ogwiritsa ntchito aziwoneka bwino.Matumba a PP ndiwonso abwino kusindikiza kutentha chifukwa cha kusungunuka kwawo kwakukulu, ndipo, monga zosankha zina zamatumba apulasitiki, ndi USDA ndi FDA zovomerezeka kuti zigwire chakudya.