造纸网部-造纸网部结构

demodemodemodemodemodemodemodemodemodemodemodemodemodemo3.网部的demodemodemodemodemodemodemodemodemodemodemodemo1)典型网案：无端成型网、胸辊、成形板、沟纹案辊、案辊、脱水板、湿吸箱、真空吸水箱、真空伏辊等脱水元件架托，并由装设在网案下的导

demodemodemodemodemodemodemodemodemodemodemo

2.3结构：管辊，表面度铜或包硬橡胶。两端热装铸铁闷头和钢制轴头，轴上装有滚动demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

2.1作用：承托成型网；脱水。2.2要求demodemodemodemodemodemodemodemodemo

3.1成形板的作用：

1）控制脱水：

2）支撑成型网：3.2成形板的结构：1）典型结构：为长条形，每块成形板由1-5条组成，根据工demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo3）安装角度与安装高度：适当前倾，同时与网面留一定间隙，可以控制脱水量，减少磨损。一般前缘留1.5-3mm，后缘留0.75-1demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo4．案辊和挡水板：

demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

demodemo

1）常用滚动轴承；

2）轴承壳应有良好的密封，防止水分浸入；

3）要保持良好的润滑，努力减少案辊转动的摩擦力矩demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo4.2沟纹案辊：4.2.1作用：在车速较高时，靠近胸辊的几根案辊常以沟纹辊代替。这样可使脱水缓和，有利于纸页的均匀成型。沟

demodemodemodemodemodemodemodemodemodemodemo4.3.2结构：钢制箱型结构，重量轻、刚度大，上沿与铜网接近的部分，宜用硬橡胶或耐磨塑料板制成，以减demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo5.案板：

5.1案板demodemodemodemodemodemodemodemodemodemodemo

1）叶片：如图4-12，有前角、水平支撑面和后倾角的长条形板，底部做成与连接支架相配合的各种榫口形状。要求摩擦系数小，而且耐磨。常用的材料有高分子聚乙烯、镶陶瓷条、全陶瓷叶demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo5.3案板设计和使用demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo脱水量随叶片倾角的增加而增大到某一最大值，继续增大倾角时，案板的脱水量很快下降。一般角在1-5°之间。车速高最大倾角选大值（1-5度内变化）；车速低最大倾角选小值（2-3度内变化）。在网部的不同demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

4）案板叶片之间的距离：在网案的湿端，适当增大叶片间的间距，单片脱水量会增加，跳浆现象会减弱。在网案demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo6.湿吸demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo1）脱水机理：湿吸箱把压差脱水和刮水两种作用结合起来，使它的脱水能力较案辊和案板大，比普通真空箱小，吸水不吸气，所以称湿吸箱。2）脱水特性：脱水稳demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

1）真空案板：图4-18。用案板做湿吸箱的面板条demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo7.1结构demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo面板宽一般为250-300毫米。

1）面板材料：过去常采用加二硫化钼的硬橡胶或加二硫化钼的MC尼龙6等材料制成，现在多用高分子聚乙烯，使用陶瓷面板的越来越多。

2）面板的开孔demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo7.3真空箱的demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

1）汽水分离：真空箱内的水和空气，通过气水分离器将水、气分开。分离器上部装有真空调节器，与真空管道相通demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo3）真空调demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo1)脱水：湿纸页经真空吸水箱脱水后，其干度为12-18％，在通过伏辊进一步脱水，可使干度达到18-22％，同demodemo

demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

8.3.1真空伏辊demodemodemodemodemodemodemodemodemo

一般用锡青铜离心浇铸而成，当使用聚酯网时，为防止腐蚀，采用铜壳包胶或不锈钢辊壳demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo8.3.2真空伏辊的demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo从理论上讲，使用包有软橡胶的的上伏辊，可以提高真空度和demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo8.3.5真空伏辊demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo可以改善网上湿纸页顶面的表面状态，表面结合强度以及均匀度；使纸页两面均有网眼以减少差异(有争议);

由于压紧纸页可改善后几个真空箱的脱水。饰面demodemodemodemodemo9.2.1按其结构分为有demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo1）铜质幅圈式；2）不锈钢缠绕式；3）demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo9.2.4喷水管和demodemodemodemodemodemodemodemodemodemodemodemo饰面辊正常工作时，把铜网压下2-3厘米，因此湿纸幅被压紧，密度增大，表面被杆平，并在纸面留下适当的网痕。随着压区中压力下降，在压区出口侧的楔形区里存在一定的负压。饰demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo10．网案的摇振装置：

10.demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo在低速纸机上，抄速低于100米/分时，如果不振荡网案，一般不易得到均匀的纸幅。抄速超过300米/分时demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo10.4摇振demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo由于可能存在网案上各滚筒的轴线相互不平形；真空箱两端的真空度有差异，从而造成铜网伸长不均匀以及网上湿纸页横幅定量不一致；或网的两端demodemo铜网趋向于沿辊筒旋转轴线的垂直方向运行。当铜网在运行中向一侧跑偏时，将原来与网案其它滚筒相平行的校正辊相应移动一个角度，使校正辊作用于铜网的力，除原有垂直于校正辊轴线的力外，另产生一个沿校正demodemodemodemodemodemodemodemodemodemodemodemodemodemodemo2)自动校demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo12.铜网张demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

1)螺杆式刚性张紧器：借手轮及螺杆机构来移动。较大的张紧距离，以适应铜网的长度变化。2)柔性张紧器：用来使铜网在运行中保持所需恒定的张力。张紧量较小。重锤demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo13.1人工换网：也称拆除式，须拆除网demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo14.网案上的喷demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

15.机架：大梁和横梁材质为普钢包不锈钢、或全不锈钢。一般摇振梁为铜质，普通支座为铸铁，抽出座为铸铝。16.造纸成型网：成型网demodemo

demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo1.2圆网的demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo由于园网的诸多缺点，特别是车速的限制，目前只用于小厂，多用于抄造特种纸、卫生纸和低档纸板。为了提高园网车速demo

demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

2.1.3普通结构demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo图4-31。将普通网笼的绕丝改成不锈钢环形片。结构：有穿片、绕片和斜片式demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo2.2.1园网槽常demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo2.2.3网槽结demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

特点：a）网笼成形弧较长;b)适合浆料浓度较低的纸张;c)上网浆料浓度低，纤维流失少;d)网面不易堵塞，清洗容易;e)纸页匀度好，紧度大demodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

demodemodemodemodemodemodemodemo2）逆流式demodemodemodemodemodemodemodemodemodemodemodemo网笼与弧形板之间的距离可以调节，使浆速与网速相协调，有利于纸张匀度和提高车速，目前使用最普遍。特点：

a)脱水能力大，适用于生产品种多变的纸种demodemodemodemodemodemodemodemodemodemodemodemodemodemo5）压力式demodemodemodemodemodemodemodemodemodemodemodemodemo通过密封装置使成型弧长缩短。demodemodemodemodemodemodemodemodemodemo2.3伏辊demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

3）偏距：伏辊中心线与网笼垂直中心线有一定的偏距，其偏角一般是顺着网笼回转方向前置15-20°，使下毛布在进入伏辊与网笼之间的压榨区前，先与网面上的湿纸页接触进行预压脱水，以避免纸页被伏辊压溃。demodemodemodemodemodemodemodemodemodemodemodemodemodemo4.鼓式真空demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo与鼓式真空成型器类似，只是采用片式网笼成型demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

7.超成型demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo图4-40。流浆箱把浆料直接喷在园网面上脱水成型。demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo7.3C型超成demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo图4-43。在超级超成型器的基础上，增加一条demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

1.2类型demodemodemodemodemodemo图4-44。c刮板式、b辊筒式、demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

2.2应用实demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo图4-48。特点是有一个半径约5米的成型区。首先是双网的挤压脱水，接着是一号网的离心脱水和二号网内弧形成型板(多个刮水板)、demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

3.2特点demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo1）巴白列成型器：图4-50。成型辊直径约760-1220demodemo没有真空伏辊，仅靠成型辊脱水，有单面脱水的实心成型辊，也有双面脱水的demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo水平demodemo图4-56

图4-57

demodemo

1）可明显提高纸张质量：表现在匀度、两面性、纤维定向，竖向结构，结合强度、留着率等各方面，是目前demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo第六节????复demodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemodemo

demodemodemo图4-58。上下都由demodemodemodemodemo

3）复合型“Cdemode