Pulp&Paper Technology •

纸业技术

MACHINERY AND PROCESS

帘式涂布

用于产生多层结构的帘式涂布

多层帘式涂布机只需经过一次涂布操作就能够赋予喷墨打印纸表面三层结构(底层、吸收层
和顶层)，并能够在不均匀的纸张表面上获得均匀的涂层

Curtain coating for

multilayer structures

A multilayer curtain coater can apply three layers – primer, absorption

layer and top coat – to inkjet paper in one pass and provides an even

coating for uneven substrates

和

其他所有加工工业一样，在造纸工业领域，想要在低成

本的条件下提高产品性能的思想已经逐渐成为主流。

对涂布产品，这就意味着所生产出来的涂层必须具

备以下两个条件：一、能够正确地包含维持一定产品功能性所需的

涂料量；二、能够在纸机纵向和横向上获得均匀分布。

新产品经常需要多层结构才能提高整个涂层自身的功能。多层

结构有助于生产过程的控制。

帘式涂布

帘式涂布是一种很有魅力的涂布方法，该方法能够提高涂层和加

工过程的作用效果。帘式涂布方式能够使涂料在纸幅横向和纵向上获

得很好地分布，经过一次涂布操作就能够同时获得多层涂层结构。

帘式涂布属于所谓的预计量涂布方式中的一种，该涂布方式主

要具有以下优点：

–

涂布量计算很简单，也就是说，质量守恒。

–

涂层分布的偏差很小，即：纵向<±0.5%；横向<±1%。

–

涂料薄膜厚度、涂料物理性能与几何特性无关。

–

横向涂层厚度的精确度主要由冲模的设计、尺寸和制造公

差决定。

–

涂料不会产生过剩。

–

更换产品种类所需时间可以缩短。

–

属于非接触式涂布方式。

–

一次涂布操作就可得到多层涂布机构。

–

能够用于双组分涂布，例如：涂布颜料和交联剂。

在预计量涂布方式中，帘式涂布是一个极具魅力的特殊涂布方

式。由于该涂布方式能够提供等高涂布，所以即使在不均匀的纸张

表面涂上也能涂上均匀的涂料。另外，也潜伏着一些涂布缺陷，比

n  the  Paper  Industry,  similar  to  almost  all  other  process
industries,  the  requirement  to  manufacture  products  with
increased  performance  at  a  lower  cost  level  is  becoming

more and more dominant.

For coated products, this means that coatings shall be

produced: i) with exactly the amount of coating liquid needed
to maintain functionality and ii) with even distribution in both
machine and in cross-machine direction.

New products, often requiring multilayer structures, are

able to improve the function of the entire coating itself.
The multilayer possibility also helps to manage the produc-
tion process.

Curtain coating

Curtain coating is an attractive method for both improving the

functionality of the coating and the process. It achieves excellent
profiles in cross-web and down-web direction and creates the
possibility of coating multiple layers simultaneously in one pass.

Curtain coating belongs to the so called pre-metered

coating methods, which are characterised by the following
main advantages:

–

A simple calculation of coat weights, that is to say,

conservation of mass

–

Minimum deviation of application profiles; that is to

say: <±0.5% in MD, <±1% in CD)

–

Film thickness depends on neither the physical

properties of the liquid nor on geometry