Ibiranga imikorere: Ubwoko bwanyuma bwa PVC yumuriro wumuriro wumuriro ukoresha impanga ebyiri zivamo umusaruro mwinshi hamwe nibikorwa byiza bya pulasitiki, kandi bifite ibikoresho byateguwe neza kugirango bishushanye inzira. Imiyoboro ine isohoka neza kandi umuvuduko wo gusohora urihuta. Ibigega bine bikonjesha vacuum birashobora kugenzurwa kugiti cyabyo kandi bigahinduka bitagize ingaruka mubikorwa byumusaruro.