亚洲欧美国产日韩字幕,欧美FREE性护士VIDE0SHD,好男人观看免费视频2018,巨乳色呦呦免费,免费观看在线日韩AV片

　　造紙設備成(cheng)形(xing)網(wang)(wang)有哪些(xie)分類?成(cheng)形(xing)網(wang)(wang)是造(zao)紙(zhi)(zhi)機上成(cheng)形(xing)裝置的一個重要(yao)組(zu)成(cheng)部分。其由伏(fu)輥或其他傳動(dong)輥帶動(dong)運行(xing)，使紙(zhi)(zhi)漿在網(wang)(wang)上連(lian)續地過濾脫水形(xing)成(cheng)濕紙(zhi)(zhi)層，并將濕紙(zhi)(zhi)層運送到伏(fu)輥處。此外，造(zao)紙(zhi)(zhi)網(wang)(wang)還有牽引(yin)網(wang)(wang)部的各種輥筒(tong)回轉的作(zuo)用。因(yin)此，造(zao)紙(zhi)(zhi)網(wang)(wang)的濾水性必須(xu)適合抄(chao)紙(zhi)(zhi)的要(yao)求;能夠承受較(jiao)大的張力;具(ju)有反復曲(qu)伸的韌(ren)性及(ji)耐磨性等。

　　成形網有金屬網(主要是(shi)銅網，也(ye)有不銹(xiu)鋼網)和(he)塑料網兩種類型(xing)。

　　(一)銅網

　　1、銅網的規(gui)格和線(xian)材(cai)

　　銅(tong)(tong)網(wang)(wang)的(de)(de)規格是指(zhi)網(wang)(wang)目(mu)(mu)(即網(wang)(wang)號)和緯密(mi)。網(wang)(wang)目(mu)(mu)是指(zhi)平行于緯線(xian)25.4mm(每(mei)英(ying)寸(cun))寬度(du)內經(jing)線(xian)(貫通銅(tong)(tong)網(wang)(wang)縱(zong)向全長的(de)(de)銅(tong)(tong)線(xian))的(de)(de)根數(shu)或網(wang)(wang)孔(kong)的(de)(de)個數(shu)。也(ye)有用每(mei)厘(li)米寬度(du)內經(jing)線(xian)的(de)(de)根數(shu)來表示的(de)(de)。緯密(mi)，是指(zhi)平行于經(jing)線(xian)每(mei)英(ying)寸(cun)寬度(du)內緯線(xian)(貫通銅(tong)(tong)網(wang)(wang)橫向全寬的(de)(de)銅(tong)(tong)線(xian))的(de)(de)根數(shu)。在一般情況下，緯密(mi)為(wei)網(wang)(wang)目(mu)(mu)的(de)(de)60%-70%。車速較(jiao)高(gao)的(de)(de)造紙機(ji)，使用緯密(mi)較(jiao)大的(de)(de)網(wang)(wang)子。

　　銅(tong)(tong)網(wang)是用鋼絲按(an)經(jing)(jing)緯(wei)線(xian)(xian)(xian)(xian)排列織成(cheng)的。縱的方向(xiang)稱(cheng)為(wei)經(jing)(jing)線(xian)(xian)(xian)(xian)，橫的方向(xiang)稱(cheng)為(wei)緯(wei)線(xian)(xian)(xian)(xian)。在(zai)銅(tong)(tong)網(wang)運行過程中，經(jing)(jing)線(xian)(xian)(xian)(xian)與緯(wei)線(xian)(xian)(xian)(xian)所(suo)(suo)受的力(li)(li)和(he)運行狀態都不同(tong)，所(suo)(suo)以(yi)經(jing)(jing)線(xian)(xian)(xian)(xian)和(he)緯(wei)線(xian)(xian)(xian)(xian)的材料成(cheng)分也不同(tong)。長網(wang)造紙機上對(dui)銅(tong)(tong)網(wang)經(jing)(jing)線(xian)(xian)(xian)(xian)要(yao)求(qiu)(qiu)具有較大的抗張力(li)(li)、彎(wan)曲(qu)力(li)(li)、耐磨性(xing)、不易伸(shen)長及耐酸(suan)堿性(xing)。磷青(qing)銅(tong)(tong)(銅(tong)(tong)89%-96%，錫4%-10%，磷0.1%-0.5%)適于(yu)經(jing)(jing)線(xian)(xian)(xian)(xian)所(suo)(suo)要(yao)求(qiu)(qiu)的性(xing)能，故通常用作(zuo)經(jing)(jing)線(xian)(xian)(xian)(xian)的材料。對(dui)緯(wei)線(xian)(xian)(xian)(xian)要(yao)求(qiu)(qiu)具有適當的彎(wan)曲(qu)性(xing)及挺直性(xing)。這是由于(yu)銅(tong)(tong)網(wang)在(zai)運轉中，經(jing)(jing)線(xian)(xian)(xian)(xian)受到相當的張力(li)(li)，使(shi)(shi)緯(wei)線(xian)(xian)(xian)(xian)彎(wan)曲(qu)，銅(tong)(tong)網(wang)的寬(kuan)度(du)呈收縮的傾向(xiang)。若經(jing)(jing)線(xian)(xian)(xian)(xian)的張力(li)(li)不均一(yi)，就會發生皺(zhou)紋，因(yin)此必(bi)須使(shi)(shi)用較經(jing)(jing)線(xian)(xian)(xian)(xian)粗的銅(tong)(tong)絲作(zuo)緯(wei)線(xian)(xian)(xian)(xian)。黃銅(tong)(tong)(銅(tong)(tong)65%，鋅35%)具有緯(wei)線(xian)(xian)(xian)(xian)所(suo)(suo)要(yao)求(qiu)(qiu)的機械性(xing)能，故緯(wei)線(xian)(xian)(xian)(xian)一(yi)般以(yi)黃銅(tong)(tong)制(zhi)成(cheng)。