Ngemuva kokuhlolwa kwekhwalithi eqinile, ipuleti lokuhlunga le-PP (ipuleti eliwumgogodla) lamukela i-polypropylene ethuthukisiwe, enokuqina okuqinile nokuqina, ethuthukisa ukusebenza kokuvalwa kokucindezelwa nokubola kwepuleti lokuhlunga, futhi i-diaphragm ithatha i-TPE elastomer yekhwalithi ephezulu, enezinga eliphezulu. ..
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