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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,造紙涂布新技術(shù),Presented for Daewoo Paper,大宇紙業(yè)技術(shù)講座,April 2003 by,John Moore Chemco International,John Moore,化聯(lián)精聚化學,Paper Coating Techniques造紙涂布新,1,Introduction,前言,W

2、e will review paper coating equipment,the basic concepts will be discussed along with:,我們將回顧一下涂布的設備，并依次討論一下其基本概念,-advantages in paper quality,對紙張的優(yōu)點,-disadvantages,對紙張的缺點,-operational issues,紙機操作的影響,These things are important to your ability to problem solve and provide detailed feed back to princip

3、le and internal customers like TMC.,這些方面對于提高解決問題的能力，并提高反饋問題的能力都是很有幫助的。,Introduction前言We will review p,2,Fundamentals,page 1,基本原理,第一頁,Almost all coaters consist of two functions:,所有的涂布機都具有兩種功能：,Application,上料裝置,metering,計量裝置,Application,consists of applying more material than is needed in the final p

4、roduct,上料是指將過量的涂料涂到紙張表面,Metering,methods remove the excess in a way which leaves the desired coating quality at the desired production rate,計量是指將過量的涂料從紙層移除，達到需要的涂布量,Fundamentals page 1 基本原理 第一頁,3,Fundamentals,page 2,基本原理,第二頁,We will consider the four most popular coating methods:,我們將討論四種比較常見的涂布方式：,B

5、lade coating both bent and stiff,刮刀涂布，硬刮刀和軟刮刀,Air Knife Coating,氣刀式涂布,Rod Coating,棒刀式涂布,Metering Size Press/Roll,計量式施膠涂布/輥式,Fundamentals page 2 基本原理 第二頁,4,Blade vs Airknife vs Rod/Metering Size Press,刮刀式涂布和棒刀/計量式施膠涂布的比較,Blade vs Airknife vs Rod/Meter,5,Factors Affecting Coater Runnability,影響涂布機運轉(zhuǎn)的因素

6、,Factors Affecting Coater Runna,6,Application and Metering Two Normal Steps,上料和計量 兩個基本的步驟,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,在造紙工業(yè)的涂布應用中刮刀式涂布是最常見的方式,ridged blade,硬刮刀,bent blade,軟刮刀,Used with various

7、application devices including:,使用不同的上料裝置，包括：,roll applicator,上料輥,short dwell,短流著,jet applicator,噴射型,Blade Coaters刮刀式涂布Blade coate,8,Stiff Blade Bent Blade at Tip,硬刮刀 軟刮刀刀尖工作情況,Stiff Blade Bent Blade at Ti,9,Typical Operational Conditions for Blade Coaters,刮刀涂布的典型工作條件,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,涂布車速,To 2000 m/min,200,to 1200 m/min,Coating Visc.,涂料粘度,800-3000,800-1500,Best suited for,最適合于,LWC,pre-coats and low coat weight,Board and high coat weights,Biggest concern,最關系到,Blade streaks,刮刀條紋,Blade streaks,刮刀條紋,Stiff Blade,硬刮刀,Bent Blade,軟刮

9、刀,Typical Operational Conditions,10,Blade Coaters-Ridged,刮刀涂布機 硬刮刀,Ridged blade coater advantages,硬刮刀涂布的優(yōu)點,smooth level surface.Excellent roto&offset print,平整的紙面-優(yōu)異的凹版和膠版印刷性能,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,當用短留著型涂布設備時

10、，非常適合輕涂紙,LWC,Ridged blade disadvantages,硬刮刀涂布的缺點,poor ability to achieve high coat weight at low speeds,在低速時很難達到高的涂布量,high coating de-watering at high blade pressure,刮刀壓力越大，保水性越差,Operational issues,操作方面,blade lines/streaks,刮刀條痕,blade wear can be high,刮刀磨損嚴重,Blade Coaters-Ridged刮刀涂布機 硬,11,Blade Coate

11、rs-Bent,刮刀涂布機 軟刮刀,Bent blade coater advantages,軟,刮刀涂布的優(yōu)點,same smooth coating as stiff blade,像硬刮刀一樣的平整紙面,ability to obtain high coat weight at low speed or solids,在較低的車速或固含量下，得到較高的涂布量,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，刮刀條痕較少,less problems with streaks

12、 than stiff blade,刮刀條痕較硬刮刀少,Bent blade disadvantages,軟刮刀涂布的缺點,poor ability to achieve low coat weight at high speeds,在高速下較難達到高的涂布量,high coating dewatering at high blade angle/pressure,在大的刮刀角度或加壓時保水性能差,Operational issues,blade lines/streaks,刮刀條痕,blade wear can be high,刮刀磨損嚴重,Blade Coaters-Bent刮刀涂布機 軟

13、刮刀,12,Roll Applicator Trailing Blade Coater,輥式涂布-整飾刮刀涂布機,Roll Applicator Trailing Bla,13,Coating/Application,Dwell,Metering,涂布/上料，留著，計量,Coating/Application,Dwell,Me,14,Blade Coater w/Short Dwell Applicator,刮刀涂布機/短留著上料裝置,Blade Coater w/Short Dwell App,15,Blade Load for Short Dwell vs Roll Applicator,

14、短留著和噴射式涂布頭的刮刀加壓,Blade Load for Short Dwell vs,16,Coating/Application,Dwell,Metering,涂布/上料，留著，計量,Coating/Application,Dwell,Me,17,Air Knife Coaters,氣刀式涂布機,AK coater advantages,氣刀式涂布機的優(yōu)點,uniform thickness coat important for optical uniformity,均一的涂層厚度，對保持均一的光學性能非常重要,versatile in coat weight and the unif

15、orm thickness is important for many functional coatings,涂布量的靈活性和均一的涂層厚度可以適應多種涂布的需求,AK coater disadvantages,氣刀式涂布機的缺點,requires low viscosity/solids&thus high drying load,需要較低的粘度/固含量，因為干燥的需求比較大,can have patterns,會形成花斑,entrained air and porous coatings,空氣會進入涂層形成中空的涂層,Operational issues,操作方面,lips become

16、 plugged especially at higher speed,噴嘴會堵賽，尤其是在高速時,can only be used on low speed&coaters under 500 m/min,只能應用于低于500,m/min,的涂布機,Air Knife Coaters氣刀式涂布機AK coa,18,Airknife Coater,氣刀式涂布機,Airknife Coater氣刀式涂布機,19,Airknife Coater double knife w/blowoff pan,氣刀式涂布機-帶吹氣面板的雙刀型,Airknife Coater double knife,20,Rod Coaters,棒刀式涂布機,Rod coater advantages,棒刀式涂布機的優(yōu)點,free of blade lines,沒有刮刀條痕,rugged/excellent for base coats,適合于底涂,Rod coater disadvantages,棒刀式涂布機的缺點,coatings can have patterns,涂層易形成花斑,solids or visco