造纸涂布新技术课件

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1、Click to edit Master title style,Click to edit Master text styles,Second level,Third level,Fourth level,Fifth level,*,Paper Coating Techniques,造纸涂布新技术,Presented for Daewoo Paper,大宇纸业技术讲座,April 2003 by,John Moore Chemco International,John Moore,化联精聚化学,Paper Coating Techniques造纸涂布新,1,Introduction,前言,W

2、e will review paper coating equipment,the basic concepts will be discussed along with:,我们将回顾一下涂布的设备，并依次讨论一下其基本概念,-advantages in paper quality,对纸张的优点,-disadvantages,对纸张的缺点,-operational issues,纸机操作的影响,These things are important to your ability to problem solve and provide detailed feed back to princip

3、le and internal customers like TMC.,这些方面对于提高解决问题的能力，并提高反馈问题的能力都是很有帮助的。,Introduction前言We will review p,2,Fundamentals,page 1,基本原理,第一页,Almost all coaters consist of two functions:,所有的涂布机都具有两种功能：,Application,上料装置,metering,计量装置,Application,consists of applying more material than is needed in the final p

4、roduct,上料是指将过量的涂料涂到纸张表面,Metering,methods remove the excess in a way which leaves the desired coating quality at the desired production rate,计量是指将过量的涂料从纸层移除，达到需要的涂布量,Fundamentals page 1 基本原理 第一页,3,Fundamentals,page 2,基本原理,第二页,We will consider the four most popular coating methods:,我们将讨论四种比较常见的涂布方式：,B

5、lade coating both bent and stiff,刮刀涂布，硬刮刀和软刮刀,Air Knife Coating,气刀式涂布,Rod Coating,棒刀式涂布,Metering Size Press/Roll,计量式施胶涂布/辊式,Fundamentals page 2 基本原理 第二页,4,Blade vs Airknife vs Rod/Metering Size Press,刮刀式涂布和棒刀/计量式施胶涂布的比较,Blade vs Airknife vs Rod/Meter,5,Factors Affecting Coater Runnability,影响涂布机运转的因素

6、,Factors Affecting Coater Runna,6,Application and Metering Two Normal Steps,上料和计量 两个基本的步骤,Application and Metering Two,7,Blade Coaters,刮刀式涂布,Blade coaters are the most commonly used metering device in the paper&board industry,在造纸工业的涂布应用中刮刀式涂布是最常见的方式,ridged blade,硬刮刀,bent blade,软刮刀,Used with various

7、application devices including:,使用不同的上料装置，包括：,roll applicator,上料辊,short dwell,短流着,jet applicator,喷射型,Blade Coaters刮刀式涂布Blade coate,8,Stiff Blade Bent Blade at Tip,硬刮刀 软刮刀刀尖工作情况,Stiff Blade Bent Blade at Ti,9,Typical Operational Conditions for Blade Coaters,刮刀涂布的典型工作条件,Head angle,0,刮刀角,35,to 50,15,to

8、25,Coating solids,涂料固含量,45,to 70,45,to 70,Coater Speed,涂布车速,To 2000 m/min,200,to 1200 m/min,Coating Visc.,涂料粘度,800-3000,800-1500,Best suited for,最适合于,LWC,pre-coats and low coat weight,Board and high coat weights,Biggest concern,最关系到,Blade streaks,刮刀条纹,Blade streaks,刮刀条纹,Stiff Blade,硬刮刀,Bent Blade,软刮

9、刀,Typical Operational Conditions,10,Blade Coaters-Ridged,刮刀涂布机 硬刮刀,Ridged blade coater advantages,硬刮刀涂布的优点,smooth level surface.Excellent roto&offset print,平整的纸面-优异的凹版和胶版印刷性能,good coat weight control at high speed or solids,高速或高固含量下的良好的涂布量控制,best LWC when used with short dwell applicator,当用短留着型涂布设备时

10、，非常适合轻涂纸,LWC,Ridged blade disadvantages,硬刮刀涂布的缺点,poor ability to achieve high coat weight at low speeds,在低速时很难达到高的涂布量,high coating de-watering at high blade pressure,刮刀压力越大，保水性越差,Operational issues,操作方面,blade lines/streaks,刮刀条痕,blade wear can be high,刮刀磨损严重,Blade Coaters-Ridged刮刀涂布机 硬,11,Blade Coate

11、rs-Bent,刮刀涂布机 软刮刀,Bent blade coater advantages,软,刮刀涂布的优点,same smooth coating as stiff blade,像硬刮刀一样的平整纸面,ability to obtain high coat weight at low speed or solids,在较低的车速或固含量下，得到较高的涂布量,can apply high coat weight on smooth substrates with few blade lines,在光滑的底面上得到高的涂布量，刮刀条痕较少,less problems with streaks

12、 than stiff blade,刮刀条痕较硬刮刀少,Bent blade disadvantages,软刮刀涂布的缺点,poor ability to achieve low coat weight at high speeds,在高速下较难达到高的涂布量,high coating dewatering at high blade angle/pressure,在大的刮刀角度或加压时保水性能差,Operational issues,blade lines/streaks,刮刀条痕,blade wear can be high,刮刀磨损严重,Blade Coaters-Bent刮刀涂布机 软

13、刮刀,12,Roll Applicator Trailing Blade Coater,辊式涂布-整饰刮刀涂布机,Roll Applicator Trailing Bla,13,Coating/Application,Dwell,Metering,涂布/上料，留着，计量,Coating/Application,Dwell,Me,14,Blade Coater w/Short Dwell Applicator,刮刀涂布机/短留着上料装置,Blade Coater w/Short Dwell App,15,Blade Load for Short Dwell vs Roll Applicator,

14、短留着和喷射式涂布头的刮刀加压,Blade Load for Short Dwell vs,16,Coating/Application,Dwell,Metering,涂布/上料，留着，计量,Coating/Application,Dwell,Me,17,Air Knife Coaters,气刀式涂布机,AK coater advantages,气刀式涂布机的优点,uniform thickness coat important for optical uniformity,均一的涂层厚度，对保持均一的光学性能非常重要,versatile in coat weight and the unif

15、orm thickness is important for many functional coatings,涂布量的灵活性和均一的涂层厚度可以适应多种涂布的需求,AK coater disadvantages,气刀式涂布机的缺点,requires low viscosity/solids&thus high drying load,需要较低的粘度/固含量，因为干燥的需求比较大,can have patterns,会形成花斑,entrained air and porous coatings,空气会进入涂层形成中空的涂层,Operational issues,操作方面,lips become

16、 plugged especially at higher speed,喷嘴会堵赛，尤其是在高速时,can only be used on low speed&coaters under 500 m/min,只能应用于低于500,m/min,的涂布机,Air Knife Coaters气刀式涂布机AK coa,18,Airknife Coater,气刀式涂布机,Airknife Coater气刀式涂布机,19,Airknife Coater double knife w/blowoff pan,气刀式涂布机-带吹气面板的双刀型,Airknife Coater double knife,20,Rod Coaters,棒刀式涂布机,Rod coater advantages,棒刀式涂布机的优点,free of blade lines,没有刮刀条痕,rugged/excellent for base coats,适合于底涂,Rod coater disadvantages,棒刀式涂布机的缺点,coatings can have patterns,涂层易形成花斑,solids or visco