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燒紙造紙機成(cheng)(cheng)(cheng)(cheng)形(xing)裝(zhuang)(zhuang)置(zhi)的(de)作用,成(cheng)(cheng)(cheng)(cheng)形(xing)裝(zhuang)(zhuang)置(zhi)又(you)稱為網部,是造(zao)(zao)(zao)紙(zhi)(zhi)(zhi)(zhi)機上最重要的(de)一(yi)部分(fen),紙(zhi)(zhi)(zhi)(zhi)料懸浮液在(zai)其上面形(xing)成(cheng)(cheng)(cheng)(cheng)紙(zhi)(zhi)(zhi)(zhi)頁,成(cheng)(cheng)(cheng)(cheng)紙(zhi)(zhi)(zhi)(zhi)質量和紙(zhi)(zhi)(zhi)(zhi)機的(de)正常(chang)生產都與成(cheng)(cheng)(cheng)(cheng)形(xing)裝(zhuang)(zhuang)置(zhi)的(de)操作有密(mi)切關系。濕(shi)紙(zhi)(zhi)(zhi)(zhi)幅一(yi)旦(dan)在(zai)成(cheng)(cheng)(cheng)(cheng)形(xing)裝(zhuang)(zhuang)置(zhi)成(cheng)(cheng)(cheng)(cheng)形(xing)后,紙(zhi)(zhi)(zhi)(zhi)張中的(de)纖維交織狀態便基本(ben)定形(xing),紙(zhi)(zhi)(zhi)(zhi)張的(de)基本(ben)物理性(xing)質也(ye)隨(sui)之(zhi)確(que)定下來(lai),隨(sui)后造(zao)(zao)(zao)紙(zhi)(zhi)(zhi)(zhi)機的(de)壓榨、干燥和壓光等過程(cheng)只能有限地(di)改(gai)善已(yi)成(cheng)(cheng)(cheng)(cheng)形(xing)紙(zhi)(zhi)(zhi)(zhi)幅的(de)性(xing)質。成(cheng)(cheng)(cheng)(cheng)形(xing)裝(zhuang)(zhuang)置(zhi)通常(chang)也(ye)是造(zao)(zao)(zao)紙(zhi)(zhi)(zhi)(zhi)機上最復(fu)雜的(de)一(yi)部分(fen),在(zai)運(yun)轉中,成(cheng)(cheng)(cheng)(cheng)形(xing)裝(zhuang)(zhuang)置(zhi)的(de)動(dong)力消耗和維修費用在(zai)整個造(zao)(zao)(zao)紙(zhi)(zhi)(zhi)(zhi)機中占有相當大的(de)比重。
紙幅(fu)的(de)成(cheng)(cheng)形(xing)是(shi)一(yi)(yi)個復雜的(de)過程(cheng),通常可(ke)簡單地(di)看(kan)成(cheng)(cheng)是(shi)纖維(wei)逐漸沉積到(dao)成(cheng)(cheng)形(xing)網(wang)網(wang)面上,相互錯(cuo)綜(zong)交(jiao)織成(cheng)(cheng)一(yi)(yi)個薄層的(de)結果(guo)。要(yao)獲得(de)組織均勻(yun)的(de)紙幅(fu),除了(le)需(xu)要(yao)性能良好(hao)的(de)流送(song)設(she)備外,還需(xu)要(yao)使(shi)(shi)紙料(liao)在(zai)成(cheng)(cheng)形(xing)網(wang)面上進行合理的(de)脫水過程(cheng)。一(yi)(yi)般可(ke)通過控制(zhi)網(wang)速(su)和上網(wang)漿(jiang)速(su)的(de)差值、網(wang)案的(de)搖振及選用適(shi)當的(de)脫水元件等方(fang)法,使(shi)(shi)纖維(wei)懸浮液在(zai)紙幅(fu)成(cheng)(cheng)形(xing)過程(cheng)中(zhong),既(ji)相對平靜又(you)具有(you)一(yi)(yi)定的(de)湍動,從而使(shi)(shi)沉積的(de)纖維(wei)分散均勻(yun),無絮團(tuan),同時(shi)又(you)避(bi)免不(bu)適(shi)當的(de)過急脫水,使(shi)(shi)紙料(liao)中(zhong)的(de)膠料(liao)、填(tian)料(liao)和細(xi)小纖維(wei)流失過多,造成(cheng)(cheng)紙幅(fu)的(de)兩面性質的(de)差別(bie)。