ND3 Curling Metso翘曲解决方案及其他问题的服务报告2012-02-20

1、Liner coating challenges21.2.2012Jukka LuotoNDPM3RCurling of liner paperHow to control? MetsoMachine Direction Curl纸机方向翘曲 MetsoCross-Machine CurlCD方向翘曲 MetsoDiagonal Curl 对角翘曲 MetsoCurl Control 翘曲控制TYPICAL REASONS FOR CURL 翘曲的典型原因Moisture difference in z-direction on the reel纸页在卷取时正反面的水分不均Non-symmet

2、ric fiber structure纤维的结构不对称，-Stronger bonds on one side pulling the sheet when drying-干燥时纸幅一面受到强烈的拉力-Diagonal curl, fiber orientation difference -对角翘曲是因为纤维的排列不同。Hysterisis (memory) effects from earlier drying process在前烘干燥时纸幅的翘曲状态会影响到成纸。（纤维有记忆）Date/Title/Author7On the reelmoist equilibrium in laborat

3、ory在化验室的湿度下Absorb waterFiber swelling吸水后纤维弯曲WetDry MetsoMultilayer liner behaviour - Structural curl多层牛卡纸的结构性翘曲现象Tight layer construction紧密的层间构造Top ply and back ply curries out loadingOn different ply is opposite fibre orientation不同层的纤维排列朝相反的方向Moisture difference expands or shrinks fibres水分不同纤维的膨胀收缩

4、不同Fibres on top and back ply twist the sheet面底层的纤维走向不同会扭曲纸页。Problem occurs on printing machine印刷机的问题Fibres on top plyFibres on base plyTop PlyBase PlyUndertop Ply Metso12/13/2021Some parameters effecting on curl 影响翘曲的一些参数ParameterEffect on curl (direction) -Top layer grammage increase增加面层定量Base laye

5、r grammage increase增加底层定量Top side coating decrease降低涂布量Top side jet-to-wire ratio close to 1.00 *面层浆网速比靠近1.00Base side jet-to-wire ratio increase *提高底层浆网速比After dryers btm side steam pressure up增加后烘下排缸蒸汽压力Surface size solids (topside) decrease降低正表挂胶量Surface size solids (backside) decrease降低背表挂胶量* st

6、arting situation is j/w-ratio 1.00 MetsoCurl Control ND3CURL CORRECTIONAdding water to the back side in the coater section在涂布段向纸页背面喷水Back side water addition is most effective if end part in the process如果在最后一段工序向纸页背面喷水是最有效的-Minimize drying after water addition-在喷水后尽量不要干燥High moisture into coater is

7、better for curl, as backside will stay wet during the coating drying process进涂布前尽量保持高的水分，因为这样背面可以在涂布段尽量保持湿润。A dry sheet into coaters is good for most quality properties, but it makes curl control more difficult进涂布时纸页比较干有利于成纸的质量（可以增加涂料吸收），但是会很难控制翘曲。-Coated side will stay wet on reel, back side will b

8、e overdry-因为这样的话涂布面在卷取缸上还是湿的，而背面则会过度干燥。-A dry sheet into coater requires curl control to be last in the predryer-如果要纸页尽量干的进涂布的话，必须在前烘就开始控制翘曲。Date/Title/Author10 MetsoCurl Control ND3 (situation 19.2.2012) 2月19日控制翘曲Verification how curling? In lab, machine hall, printing house确认在化验室、车间、客户仓库等不同环境下翘曲的状

9、态确认在化验室、车间、客户仓库等不同环境下翘曲的状态Up side, down side or diagonal up or downwards?是向上翘曲、向下翘曲还是对角向上或对角向下翘曲。是向上翘曲、向下翘曲还是对角向上或对角向下翘曲。Verification moisture measurement确认在线水分测量是否准确Target moisture; final, intermediate目标水分，最终水分Adjustment: IQAquaPro for moisturising, Cooling cylinders, 10th group, 9th group, 8th gro

10、up, predryer, J/W ratio adjustments调节：开横幅喷湿水，冷缸、前、后烘进汽调节，浆网速比调节Systematic study/testing of curl condition系统的学习测试翘曲的状态Date Author TitleINTERNAL118th group 2,2 bar Heat top side9th group No heating8th group2,1 bar Heat btm sideHeattopCooltop4*Heat top3*Heat topOpen8,2 %9% 9% 8%Predry dry btm side3,4 b

11、arPredry top4,3 barDry top sideCD moisture profile9th group No heating MetsoCurl Control ND3 (curl up)Verification how curling? In lab, machine hall, printing houseIf the problem is curl upside如果是正面翘曲应该怎么做如果是正面翘曲应该怎么做Every bottom cylinder must be heated. Top less as possible 后烘所有的下排烘缸都必须加热，上排缸尽量少进汽。

12、Maxium moisturezing and web temperature on AquaPro. Infra dryer should do the CD moisture profile把横幅喷湿水手动开到最大，而用第三组红外干燥来控制横幅水分 More sizing on bottom side.增加背表的挂胶量Coating amount smaller减少涂布量Date Author TitleINTERNAL1210 th groupHeat btm8th groupHeat btm9th groupHeat btm 8th groupCool topHigh moisture

13、requiredCooltop10th groupCool topOpen? %?% ?% ?%Predry Cool topWet btm sidePredry Heat btmDry top sideMoisturizer max.for bottom. Temperaturesame as web9th groupCool topCoolbtm MetsoCurl Control ND3 (curl down)Verification how curling? In lab, machine hall, printing houseIf the problem is curl down

14、side如果是背面翘曲应该怎么调如果是背面翘曲应该怎么调Every top cylinder must be heated.后烘每一个上排缸必须进汽。Moisturizing CD profile and web temperature on AquaPro. Infra dryer should be off.用横幅喷湿水来控制横幅水分，第三组红外干燥关闭。 More sizing on top side.增加正表挂胶量 Coating amount bigger增加涂布量Date Author TitleINTERNAL1310 th groupCool btm8th groupCool

15、btm9th groupCool btm8th groupHeat topHigh moisturerequiredCooltop10th groupHeat topOpen? %?% ?% ?%Predry Heat topWet btm sidePredry Cool btmDry top sideMoisturizer max.for bottom. Temperaturesame as web9th groupHeat topCoolbtm MetsoCurl Control ND3 (diagonal curl)Verification how curling? In lab, ma

16、chine hall, printing houseIf the problem is diagonal curl如果是对角翘曲怎么调？如果是对角翘曲怎么调？All layers J/W ratio should be calibrated.各层的浆网速比应该要校正。Base ply should be far from 1.000底层浆网速比应该远离1.000 Undertop & top must be close to 1.000面、芯层浆网速比尽量靠近1.000 Dewatering ratio bottom/top side 正、背面脱水率不要变化太大 On below no

17、 big influence 正反定量面不要有太大波动Date Author TitleINTERNAL14CooltopOpen? %?% ?% ?%Moisturizer max.for bottom. Temperaturesame as webCoolbtm MetsoCurl Control ND3 (MD curl)Verification how curling? In lab, machine hall, printing houseIf the problem is MD curl (curling in CD direction)如果是纸机方向翘曲怎么调？ Reel tem

18、perature must be close to machine hall temperature. Both cooling cylinder must be on.在卷取时的纸页稳定尽量接近车间环境稳定，所以2个冷缸都必须进水。 Also same things has affection as on up & down curl按照向正/反面翘曲的调节方法调 Moisturizing temperature lower than web temperature.横幅喷湿水的温度要低于纸页温度Date Author TitleINTERNAL15CooltopOpen? %?%

19、?% ?%Moisturizer max.for bottom. Coolbtm MetsoActions for curl problem解决翘曲的行动IQAquaPro for the curl control not for moisture profile. Date Author TitleINTERNAL16-If there are curl problem the moisture level can be increased to 80%.如果有正面翘曲可以把水分阀门开到80- The CD moisture control should be on Manual, if t

20、he are upside curl problem.如果正面翘曲，水分横幅控制要打手动 MetsoActions for curl problemInfra dryer for moisture profile control, not for heating. Date Author TitleINTERNAL17- The CD moisture should be controlled by Infra dryer. The profile will be not so good but ok.-用3#电红外控制横幅水分控，这样横幅虽然不会太好但是可以用。- The control s

21、hould be on Auto and level change if the actuators go to maxiuim.应该达到自动控制，而且当单个阀门开到头时要调节整体阀门级数。 MetsoActions for curl problemIQAquaPro water temperature control. 横幅喷水温度控制Date Author TitleINTERNAL18- The water doesnt go inside of the web because the water temperature is too low.- The water temperatur

22、e must be close to the web.横幅喷湿水温度必须和纸页温度接近，因为如果温度太低，水进不到纸页里。- There should be condensate of warm pure water. Not cold pure water.横幅喷湿水应该用热的冷凝水而不是冷水。 MetsoActions for curl problemFind out the best J/W ratio for base ply 找到底层最佳浆网速比Date Author TitleINTERNAL19- The base ply J/W ratio need to keep far f

23、rom 1.000- The New 1.000 point was found from 0,985.- The affection should be tested.-底层浆网速比尽量远离1.00（通过测试纸幅宽度，设定到0.985实际浆网速比为1.00）所以浆网速比应设在0.960.97之间。 MetsoEffect of Jet/Wire Speed DifferenceFibre misalignment gain factorEasy for control to keep the pressure in same side.-8-6-4-202468-20-15-10-50510

24、1520Difference in Jet and Wire speed (m/min)Fibre misalignment angle in degreesProduction BM v=290m/minm=230g/m ”Best running point” Very difficult to control. MetsoActions for curl problemFind out the best J/W ratio for undertop ply Date Author TitleINTERNAL21- The undertop ply J/W ratio need to ke

25、ep close to 1.000- The New 1.000 point need to calibrate.- The affection should be tested.-芯层浆网速比最好接近1.000。但需要找准目前的浆网速比。 MetsoActions for curl problemFind out the best J/W ratio for top ply Date Author TitleINTERNAL22- The top ply J/W ratio need to keep close to 1.000- The new 1.000 should be calibr

26、ated.- The affection should be tested.面层浆网速比最好接近1.000。但需要找准目前的浆网速比。 MetsoSeveral samples cut from a cross machine sample从纸机横向裁一些纸样Small samples dried in drying box for 3 min将纸样在烘箱里烘3分钟Curl is sheet height in mm: measured from outside the box through a transparent plate测量纸页的翘曲距离 CurlMD+-TopsideBottom

27、 sideBox Curl Method用烘箱测试翘曲的方法用烘箱测试翘曲的方法7/96 AKOther problemsSticky problem胶粘物问题Date Author TitleINTERNAL24 MetsoSticky problemMany breaks on predryer, sizer & coating section在前烘、表胶、涂布段断纸太多。Date Author TitleINTERNAL25The web is sticking on cylinder surface between 1st, 2nd, 3rd cylinders. This a

28、re causing breaks, because some of the fibres are sticking to the cylinder. Than there are hole in the base layer. After that the web will be get wet and breaks on sizer or coating section.前烘1、2、3#烘缸表面胶粘物太多，这会引起断纸。因为纸会被胶粘下来从而形成孔洞。这样就会在表胶或涂布段断纸。Reasons for sticky: 胶粘物多的原因 The cylinder temperature dif

29、ferences were too high.这些烘缸的温差太大 Also the temperature were too high前烘一组二组烘缸温度太高 The doctor blades were old.刮刀太旧 SymRun blow boxes are not working correct. Dirty! Needs cleaning by high pressure shower. Accoring to Metsos recommendation this work should done every year.稳纸风箱没有正确工作，太脏了！需要用高压水清洗。根据Metso

30、的建议这项工作必须每年都做。 Speed draw on 1st dryer group 把一组的速差调大一些 Chemical dosing, too much to base layer. 使用胶粘物控制剂，特别是底层。 MetsoFibres on 2nd cylinder doctor blade and cylinder surface very dirty.2#缸的表面太脏，太多纸毛胶粘物。Date Author TitleINTERNAL26 MetsoCylinder temperature were measured 20.2.2012Date Author TitleINT

31、ERNAL27Web temperature before 1st cylinder was 41C. The 1st cylinder temperature must be close by web temperature. Next cylinder temperatures should follow as Typical line goes (step by step).纸幅在进1#缸前的温度是41C，那么1#缸的温度要接近纸页温度。接下来的烘缸温度要按照干燥曲线一步一步升温。Other problemsCoating stations adjustments涂布机的调节 Metso

32、Using bend-blade mode面涂使用软刮刀模式Date Author TitleINTERNAL29 Coating amount should adjusted only by beam angle or coating color solid. Good operating range is 18 to 30 degree and solid 55% to 69%. 只能用刮刀角度和涂料固含量来调节上料量。刮刀角度在1830度，固含量在55%69%比较合适。 more coating, smaller angle 要加涂布量就调小刮刀角度 less coating, bigg

33、er angle 要减涂布量就调大刮刀角度 more coating, higher solid 要加涂布量就调大固含量 less coating, smaller solid 要减涂布量就调小固含量 Coating color temperature should be between 30 to 45 C. If its higher to viscosity be will lower.涂料温度必须在3045 C,否则会带来粘度变化 The preloading should be all the time same 5-7 mm. 刮刀梁间隙在所有时间都应该在57mm之间。 If th

34、e preloading goes too low, it will be in stiff mode and profile poor.如果刮刀梁间隙太小，那么就会像硬刀涂布（刀尖刮涂料而不是刀背敷抹），横幅也会非常差。 MetsoBlade CoatingBlade Coat Weight Adjustment 涂布量调节30Stiff blade, coating station 1硬刀 预涂-Hose loading for adjusting coating amount 上涂量用管道负载调节-More hose pressure Coat weight decrease.管负载越大

35、上涂量越小Bend blade, coating station 2软刀 面涂-Blade angle for adjusting coating amount刮刀角度用量调节上料量-Smaller blade angle Coat weight increase刮刀角度越小上涂量越大-Very sensitive Adjusting not easy非常敏感很难调节Other problemsCoating stations supply systemsPumps sealing waters missing涂料上料站的上料泵都没有密封水 MetsoPumps will be broken

36、soon and mechanical quarantee will be over because no sealing water如果没有密封水泵会很快损坏，机械密封也会很快磨完。Date Author TitleINTERNAL32ST2 supply system pump二涂上料泵ST1 supply system pump一涂上料泵Other problemsBetter surface on bottom and energy save背面更好的表面性能和节能 MetsoOptiHard SYMCD hydraulic unit temperature set point shoud be 60C硬压光下辊的液压油温度应该设到60CDate Author TitleI