12.3 圆网成形装置在线视频

介绍完了长网成形器我们下面来学习
After the introduction of the fourdrinier former, let’s learn

第三节 圆网成形装置
Section 3 Cylinder Forming Device

圆网造纸机的网部
The wire section of the cylinder paper machinery

常简称圆网
is often referred to as the cylinder

主要由网笼、网槽和伏辊组成
which is mainly composed of the wire cage, the wire trough and the couch

网笼浸放在网槽中
Wire cage is immersed in the wire trough

随着网笼的回转
With the rotation of the wire cage

由于网内外液位的差
because of the difference of the liquid level inside and outside the wire

浆料中的纤维等物料因过滤作用
the fiber in the pulp and other materials are deposited

不断沉积到网笼的网面上
on the wire surface of the wire cage because of the filtering action

当纤维层通过网笼上方的伏辊时
When the fiber layer passes through the couch at the top of the cage

就自网面转移到
it is transferred from the wire surface

包住伏辊的无端毛毯上
to the endless blanket covering the couch

从而形成连续的湿纸幅
thus forming a continuous wet paper web

圆网结构简单
The cylinder is simple in structure

占地面积小，投资少
small in area and less in investment

多用于抄造要求
It is mainly used for making thin paper

较低的薄纸、卡纸和纸板
cardboard and paperboard with low requirement

圆网的纸幅成形过程
The paper web forming process of cylinder

基本上是一个过滤过程
is basically a filtering process

在圆网造纸机上
In the cylinder

网笼内的白水不断排出
the white water in the wire cage is discharged continuously

并与网笼外的浆位
and a constant pressure difference is formed

形成一定压差
with the pulp level outside the wire cage

由此产生的过滤现象
The resulting filtering phenomenon

使纤维附着到网面上
makes the fiber attached to the wire surface

随着网笼的回转
and the paper web is formed continuously

而不断地形成纸幅
with the rotation of the wire cage

过滤的压差
The effect of filter pressure difference

（即网笼内外的水位差）
(i. e. the water level difference inside and outside the wire cage)

在抄造薄型纸张时，影响是明显的
is obvious when making thin type paper

而抄造较厚的纸张或纸板时
However, when making thick paper or paperboard

增加水位差对过滤速度
increasing the water level difference

几乎不起作用
has little effect on the filtration speed

通常只能用多个圆网
usually only with a plurality of cylinder

即用增加过滤面积的方法
which can be used to increase the filter area

来达到所需的纤维层厚度
to achieve the required fiber layer thickness.

在圆网上的纸幅成形过程中
The orientation, separation and elution of the fibers

无论是在何种型式的网槽上
occur to varying extent in the process

都不同程度地发生
of paper web forming on the cylinder

纤维的定向、选分和洗脱的现象
regardless of the type of wire trough

1. 纤维的定向主要是由于
1. The orientation of the fiber is mainly caused

纸浆与网笼之间的速度差异
by the tractive effort resulting from the speed difference

纤维受到网笼回转时的
between the pulp and the wire cage

牵引作用而造成的
when the wire cage rotates

2. 纤维选分现象是由于
2.The phenomenon of fiber separation is due to

细小纤维有较大的表面积
the large surface area

和较强的吸附作用
and strong adsorption of fine fibers

较易于沉积和附着在
which makes fine fibers easy to deposit and attach

网面的纤维层上面造成的
to the fiber layer on the wire surface.

3. 纤维被冲脱的现象是指
3.The phenomenon of the fiber being eluted refers to

网笼的网面上已经沉积的纤维
the phenomenon of the fiber being deposited on

由于受到网槽内
the wire surface of the wire cage

纸浆的冲洗作用
partially returning to the fiber suspension

部分地重新回到纤维悬浮液中的现象
due to the washing of the pulp in the wire trough

下面来介绍一下圆网纸机的
The following is a brief introduction to the structure

具体结构和构成
and composition of the cylinder paper machinery

网笼是圆网造纸机中
The wire cage is the main part on which

纸幅在其上成形的主要部件
the paper web is formed in the cylinder paper machinery

如图即为典型的网笼结构
The picture is the typical wire cage structure

圆网笼按结构分为
the cylinder cage according to the structure is divided into

普通、片式、抽气、真空网笼
ordinary, slice, suction, vacuum wire cage

按材质分为
according to the material is divided into

普通、全铜、不锈钢网笼
ordinary, all copper, stainless steel wire cage

网笼的里网一般用8～16目
The inner wire of the wire cage is 8~16 mesh

主要是用来分散伏辊的压力
which is mainly used to disperse the pressure of the couch

保持面网平整
and keep the wire flat

面网比较致密
The face mesh is relatively dense

用来过滤纤维形成纸幅
and is used to filter the fibers to form paper web

一般为40～100目
is generally 40-100 mesh

网目的选用主要决定于
The selection of mesh mainly depends on

所生产纸张的品种
the variety of paper produced

生产一般文化用纸
The most commonly used mesh for producing

最常用的网目是65目
common culture paper is 65 mesh

网槽结构常用木材制成
The wire trough is usually made of wood

网槽圆环的主要部分
and the main part of the ring of wire trough

有时衬以金属（常为不锈钢）
is sometimes lined with metal (usually stainless steel)

有时也用塑料材质
and sometimes with plastic material

所谓网槽圆环是指网笼面
The so-called ring of wire trough refers to

与半圆体之间的环隙
the ring gap between the wire cage surface and the semicircle

网槽圆环必须仔细构筑
The ring of wire trough must be carefully constructed

其外形必须匀称和光滑
and its shape must be symmetrical and smooth

网槽的形式较多
The form of wire trough is various

沿用最久的型式是
The longest-used types are the straight-flow

顺流式网槽和逆流式网槽
and counter-flow type wire trough

目前我国使用比较广泛的是
At present, the widely used wire trough in our country

活动弧形板式网槽
includes movable arc-shaped wire trough

还有干式网槽
dry-type wire trough

旋转式成形器和鼓式真空成形器等
rotary former and drum type vacuum former, etc.

在更高级些的纸机上
and extraction type cylinder is used on

则使用抽气式圆网等
more advanced paper machinery

如图为顺流式网槽
As shown in the picture, they are the straight-flow type

和逆流式网槽
and counter-flow type wire trough

以及活动弧形板式网槽的结构图
and the movable arc-shaped plate-type wire trough

下面介绍一下三种网槽的特点
The following are the features of the three wire trough

顺流式
Straight flow type

浆流与网转动方向相同
The pulp flow and the wire rotation direction is the same

有很大的脱水弧长
It has the big dehydrating arc length

可以使用浓度较低的纸浆
and can use low-concentration pulp

成纸的匀度较好
The paper homogeneity is better

紧度较大，也较平滑
the compactness is bigger, and smoother

结构简单，清洗方便
simple in structure, easy to clean

适用于各种文化用纸
It is applicable to make all kinds of cultural paper

一般薄纸、原纸
common thin paper, original paper

纸绳纸、油封纸等的抄造
paper rope paper, oil seal paper and so on

逆流式
Counter-flow type

纸浆流动方向与圆网转动相反
pulp flow direction is opposite to the cylinder rotation

上网浓度高
with high concentration of approaching wire

白水浓度大
high white water concentration

纤维流失多
more fiber loss

纵横张力比小
small vertical and horizontal tension ratio

纸质疏松，透气度大
loose paper, and big air permeability

表面有竖立的小纤维
the surface has erect small fiber

适合于抄造纸板
suitable for making paper board

活动弧形板式网槽
Movable arc-shaped plate-type wire trough

浆速可调，应用广
adjustable pulp speed, wide application

成形弧较短，上网浓度高
Forming arc is shorter, wire density is higher

纤维流失较多
fiber loss is more

浆料的上网压力大
The pressure of the pulp is high

有利于改善纸页的匀度
which is helpful to improve the uniformity of the paper

成纸的紧度和纵横向张力比小
The paper’s compactness and transverse tension ratio is small

透气度较高
the air permeability is high

纸页的背面较粗糙
the back of the paper page is rough

网易脏，易产生透光点
The wire is easy to dirty, easy to produce light point

由于圆网成成形装置
Because of the limitation of the structure

结构和原理的限制
and principle of the circular wire forming device

存在临界速度
there is a critical speed

即为当湿纸页所受到的离心力
that is, when the centrifugal force on the wet paper sheet

与在网上的重力相等时
is equal to the gravity on the net

湿纸页处于临界状态
the wet paper sheet is in a critical state

此时的圆网圆周速度称为
and the circumferential speed of the circular wire

“圆网纸机的临界速度”
is called "the critical speed of the circular wire paper machinery"

纸机的车速称为
and the speed of the paper machinery is called

圆网纸机的极限车速
the ultimate speed of the circular wire paper machinery

尽管可以通过增大网笼直径
Although the critical speed can be improved by

网内减压和网外加压等方法increasing the wire cage diameter, depressurizing inside the net

来提高临界速度and pressurizing outside the net

然而这一限制不符合this limit do not meet the requirements

如今的高车速生产要求of today’s high-speed production

近年发展出了超级圆网成形器and in recent years a super-round mesh former has been developed

超级成形器是一个
Super former is a cylinder

带附属流浆箱的圆网机
with an auxiliary cylinder

“超成形”圆网主要是
“Super forming” cylinder is mainly composed

由流浆箱和真空网笼组成
of flow box and vacuum wire cage

流浆箱的结构和
The structure of flow box and

长网纸机的流浆箱基本是相同的
the flow box of fourdrinier is basically the same

真空网笼和抽气式圆网的结构类似The structure of vacuum wire cage and extraction cylinder is similar

利用流浆箱将纤维悬浮液
which uses flow box to feed the fiber suspension

送上圆网顶部的成形网上
to the forming wire on the top of the cylinder

在很短的网面上快速脱水和成形
and dehydrate and form on the short wire surface

然后进入网笼和毛毯之间的压力楔形体
then enter the forming wire between the wire cage and the blanket

受到逐渐增加的压力
after bearing the pressure increased gradually

进行挤压脱水
then extruded and dehydrated

在最大脱水点会产生细小的湍动
Micro-turbulence will produce at the biggest dehydration point

这对层间结合与匀度均是有利的
which is beneficial to the interlayer bonding and evenness

最后，形成的湿纸幅随毛毯
Finally, the wet paper web formed will enter the next cylinder

进入下一圆网或是去压榨部
with the blanket or the press part

车速为100~500m/min
The speed is 100~500m/min

除了图中所示的普通超成型以外
In addition to the ordinary super-forming as shown in the picture

还有超级超成形器
there are super super-forming machine

超成C型成形器、超成T型成形器
super C-forming machine and super T-forming machine

谢谢同学们
Thank you all

本节就讲到这里
So much for this section