造紙網部-造紙網部結構

demodemodemodemodemodemodemodemodemodemodemodemodemodemo3.網部的demodemodemodemodemodemodemodemodemodemodemodemo1)典型網案：無端成型網、胸輥、成形板、溝紋案輥、案輥、脫水板、濕吸箱、真空吸水箱、真空伏輥等脫水元件架托，并由裝設在網案下的導

demodemodemodemodemodemodemodemodemodemodemo

2.3結構：管輥，表面度銅或包硬橡膠。兩端熱裝鑄鐵悶頭和鋼制軸頭，軸上裝有滾動demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

2.1作用：承托成型網；脫水。2.2要求demodemodemodemodemodemodemodemodemo

3.1成形板的作用：

1）控制脫水：

2）支撐成型網：3.2成形板的結構：1）典型結構：為長條形，每塊成形板由1-5條組成，根據工demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo3）安裝角度與安裝高度：適當前傾，同時與網面留一定間隙，可以控制脫水量，減少磨損。一般前緣留1.5-3mm，后緣留0.75-1demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo4．案輥和擋水板：

demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

demodemo

1）常用滾動軸承；

2）軸承殼應有良好的密封，防止水分浸入；

3）要保持良好的潤滑，努力減少案輥轉動的摩擦力矩demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo4.2溝紋案輥：4.2.1作用：在車速較高時，靠近胸輥的幾根案輥常以溝紋輥代替。這樣可使脫水緩和，有利于紙頁的均勻成型。溝

demodemodemodemodemodemodemodemodemodemodemo4.3.2結構：鋼制箱型結構，重量輕、剛度大，上沿與銅網接近的部分，宜用硬橡膠或耐磨塑料板制成，以減demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo5.案板：

5.1案板demodemodemodemodemodemodemodemodemodemodemo

1）葉片：如圖4-12，有前角、水平支撐面和后傾角的長條形板，底部做成與連接支架相配合的各種榫口形狀。要求摩擦系數小，而且耐磨。常用的材料有高分子聚乙烯、鑲陶瓷條、全陶瓷葉demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo5.3案板設計和使用demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo脫水量隨葉片傾角的增加而增大到某一最大值，繼續(xù)增大傾角時，案板的脫水量很快下降。一般角在1-5°之間。車速高最大傾角選大值（1-5度內變化）；車速低最大傾角選小值（2-3度內變化）。在網部的不同demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

4）案板葉片之間的距離：在網案的濕端，適當增大葉片間的間距，單片脫水量會增加，跳漿現象會減弱。在網案demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo6.濕吸demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo1）脫水機理：濕吸箱把壓差脫水和刮水兩種作用結合起來，使它的脫水能力較案輥和案板大，比普通真空箱小，吸水不吸氣，所以稱濕吸箱。2）脫水特性：脫水穩(wěn)demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

1）真空案板：圖4-18。用案板做濕吸箱的面板條demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo7.1結構demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo面板寬一般為250-300毫米。

1）面板材料：過去常采用加二硫化鉬的硬橡膠或加二硫化鉬的MC尼龍6等材料制成，現在多用高分子聚乙烯，使用陶瓷面板的越來越多。

2）面板的開孔demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo7.3真空箱的demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

1）汽水分離：真空箱內的水和空氣，通過氣水分離器將水、氣分開。分離器上部裝有真空調節(jié)器，與真空管道相通demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo3）真空調demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo1)脫水：濕紙頁經真空吸水箱脫水后，其干度為12-18％，在通過伏輥進一步脫水，可使干度達到18-22％，同demodemo

demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

8.3.1真空伏輥demodemodemodemodemodemodemodemodemo

一般用錫青銅離心澆鑄而成，當使用聚酯網時，為防止腐蝕，采用銅殼包膠或不銹鋼輥殼demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo8.3.2真空伏輥的demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo從理論上講，使用包有軟橡膠的的上伏輥，可以提高真空度和demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo8.3.5真空伏輥demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo可以改善網上濕紙頁頂面的表面狀態(tài)，表面結合強度以及均勻度；使紙頁兩面均有網眼以減少差異(有爭議);

由于壓緊紙頁可改善后幾個真空箱的脫水。飾面demodemodemodemodemo9.2.1按其結構分為有demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo1）銅質幅圈式；2）不銹鋼纏繞式；3）demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo9.2.4噴水管和demodemodemodemodemodemodemodemodemodemodemodemo飾面輥正常工作時，把銅網壓下2-3厘米，因此濕紙幅被壓緊，密度增大，表面被桿平，并在紙面留下適當的網痕。隨著壓區(qū)中壓力下降，在壓區(qū)出口側的楔形區(qū)里存在一定的負壓。飾demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo10．網案的搖振裝置：

10.demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo在低速紙機上，抄速低于100米/分時，如果不振蕩網案，一般不易得到均勻的紙幅。抄速超過300米/分時demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo10.4搖振demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo由于可能存在網案上各滾筒的軸線相互不平形；真空箱兩端的真空度有差異，從而造成銅網伸長不均勻以及網上濕紙頁橫幅定量不一致；或網的兩端demodemo銅網趨向于沿輥筒旋轉軸線的垂直方向運行。當銅網在運行中向一側跑偏時，將原來與網案其它滾筒相平行的校正輥相應移動一個角度，使校正輥作用于銅網的力，除原有垂直于校正輥軸線的力外，另產生一個沿校正demodemodemodemodemodemodemodemodemodemodemodemodemodemodemo2)自動校demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo12.銅網張demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

1)螺桿式剛性張緊器：借手輪及螺桿機構來移動。較大的張緊距離，以適應銅網的長度變化。2)柔性張緊器：用來使銅網在運行中保持所需恒定的張力。張緊量較小。重錘demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo13.1人工換網：也稱拆除式，須拆除網demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo14.網案上的噴demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

15.機架：大梁和橫梁材質為普鋼包不銹鋼、或全不銹鋼。一般搖振梁為銅質，普通支座為鑄鐵，抽出座為鑄鋁。16.造紙成型網：成型網demodemo

demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo1.2圓網的demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo由于園網的諸多缺點，特別是車速的限制，目前只用于小廠，多用于抄造特種紙、衛(wèi)生紙和低檔紙板。為了提高園網車速demo

demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

2.1.3普通結構demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo圖4-31。將普通網籠的繞絲改成不銹鋼環(huán)形片。結構：有穿片、繞片和斜片式demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo2.2.1園網槽常demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo2.2.3網槽結demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

特點：a）網籠成形弧較長;b)適合漿料濃度較低的紙張;c)上網漿料濃度低，纖維流失少;d)網面不易堵塞，清洗容易;e)紙頁勻度好，緊度大demodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

demodemodemodemodemodemodemodemo2）逆流式demodemodemodemodemodemodemodemodemodemodemodemo網籠與弧形板之間的距離可以調節(jié)，使?jié){速與網速相協調，有利于紙張勻度和提高車速，目前使用最普遍。特點：

a)脫水能力大，適用于生產品種多變的紙種demodemodemodemodemodemodemodemodemodemodemodemodemodemo5）壓力式demodemodemodemodemodemodemodemodemodemodemodemodemo通過密封裝置使成型弧長縮短。demodemodemodemodemodemodemodemodemodemo2.3伏輥demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

3）偏距：伏輥中心線與網籠垂直中心線有一定的偏距，其偏角一般是順著網籠回轉方向前置15-20°，使下毛布在進入伏輥與網籠之間的壓榨區(qū)前，先與網面上的濕紙頁接觸進行預壓脫水，以避免紙頁被伏輥壓潰。demodemodemodemodemodemodemodemodemodemodemodemodemodemo4.鼓式真空demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo與鼓式真空成型器類似，只是采用片式網籠成型demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

7.超成型demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo圖4-40。流漿箱把漿料直接噴在園網面上脫水成型。demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo7.3C型超成demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo圖4-43。在超級超成型器的基礎上，增加一條demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

1.2類型demodemodemodemodemodemo圖4-44。c刮板式、b輥筒式、demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

2.2應用實demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo圖4-48。特點是有一個半徑約5米的成型區(qū)。首先是雙網的擠壓脫水，接著是一號網的離心脫水和二號網內弧形成型板(多個刮水板)、demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

3.2特點demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo1）巴白列成型器：圖4-50。成型輥直徑約760-1220demodemo沒有真空伏輥，僅靠成型輥脫水，有單面脫水的實心成型輥，也有雙面脫水的demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo水平demodemo圖4-56

圖4-57

demodemo

1）可明顯提高紙張質量：表現在勻度、兩面性、纖維定向，豎向結構，結合強度、留著率等各方面，是目前demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo第六節(jié)????復demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

demodemodemo圖4-58。上下都由demodemodemodemodemo

3）復合型“Cdemode