0401000 headbox

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  • VOITH has developed a special lamella design which allows to extend some lamellas very close to the nozzle exit. (without creating the effect of lamella oscillation.) With this long lamella, very intense micro turbulence is created, with which tear ratio may be reduced as well. - CLICK - First time we installed new Headbox hydraulics was last year in October at Hausmening, Austria, on PM 5 of Neusiedler group. Here, we‘d like to thank the staff of Neusiedler to trust in our approach and for the good cooperation during the project. Because of the success, just recently (in June) the group ordered same Headbox type for a copy paper machine in Hungary (?).
  • In brief the function of the ModuleJet is a closed-spaced adjustment of the CD stock consistency profile through sectional metering with white water 1 meanwhile the slice gap remains parallel. Two parabolic headers distribute the stock to a number of adjacent mixing units positioned with intervals across the machine width. The larger header transports the high-consistency flow and the smaller header the low consistency. In each connecting pipe between the low consistency header and the mixing chamber there is a metering valve The high and low consistency flows are led together in the mixing chamber. The hydraulic conditions in the mixing chamber guarantee an existing volume flow, which remains constant with varying local mixing conditions. A throttle at the mixing chamber outlet ensures optimum blending of the two flows QH and QL before the suspension flow is equalized in the connecting stilling chamber. Let‘s proceede now to analyze the ModuleJet valve technology...-CLICK- N.B Angle is 3°
  • 0401000 headbox

    1. 1. VKPC – PM#1 Training Headbox
    2. 2. Introduction 1. Introduction Trainer 2. Training Schedule
    3. 3. Introduction of the Trainer <ul><li>Toru Maruyama </li></ul><ul><li>Paper Machine Engineering Dept. </li></ul>
    4. 4. Training Schedule <ul><li>Training Time </li></ul><ul><li>Breaks </li></ul><ul><li>Lunch </li></ul><ul><li>Question and Answer </li></ul>
    5. 5. Technical Data 1. Basic Design Data 2. Technical Specification
    6. 6. Basic Design Data – Layout data 5.300 mm Untrimmed paper width on pope 5.950 mm Wire width Design width 105 - 125 gsm CM 125 - 250 gsm T2 (100% OCC) 125 - 275 gsm T1 (Pulp on Top) Basis weight 125 gsm (Reference liner grade) Basis weight 8% Moisture at reel 100% With efficiency max. 744 to/24h At PM reel Design production Liner Board (Test Liner: T1, T2) Corrugating Medium Paper Grade
    7. 7. Basic Design Data – Layout data 3.000 mm Max. parent reel diameter: Reel spool Drive on right hand side facing the reel:   Standing at the headbox Hand of machine 900 m/min Balancing speed 900 m/min Design speed 900 m/min Drive speed 355 - 800 m/min Production speed range Operating speed
    8. 8. Technical Specification of HEADBOX Back Layer Under Top Layer 48 - 113 28.9 – 45.2 25.0 – 42.5 6.5 – 6.5 Master Jet II F/B 33/3-MJ-H-SC 47 - 112 28.6 – 44.7 30.8 – 48.0 NONE Master Jet II F/B 33/3-B-H 30 - 60 Basis Weight(g/m 2 ) 5739 900 323 - 747 Slice Width(mm) Design Speed(m/min) Production Speed(m/min) 20.9 – 51.8 22.2 – 55.1 NONE Flow to wire(m 3 /min) Flow to HC Header(m 3 /min) Flow to LC Header(m 3 /min) Master Jet II F/B 25/3-H-2L Headbox Type Top Layer
    9. 9. Description <ul><li>Technology </li></ul><ul><li>Component </li></ul>
    10. 10. TOP Layer HEADBOX UNDER TOP Layer HEADBOX BACK Layer HEADBOX
    11. 11. Function of the Headbox Stabile Jet Influence of jet direction Cross profile Control - Stock consistency Turbulence generation Cross profile Control - Slice blade adjustment
    12. 12. MasterJet F/B with directly flanged-on header TOP Layer MasterJet II F/B 25/3-H-2L - PD tank (for stable pressure) - Swing Header (for easy cleaning) - Turbulence generator (for good sheet formation) - Edge Master (for stable stock on wire) - Lamella (for good sheet formation)
    13. 13. MasterJet F/B with directly flanged-on header UNDER TOP Layer MasterJet II F/B 33/3-H - PD tank (for stable pressure) - Swing Header (for easy cleaning) - Turbulence generator (for good sheet formation) - Edge Master (for stable stock on wire)
    14. 14. MasterJet F/B with ModuleJet BACK Layer MasterJet II F/B 33/3-MJ-H-SC - PD tank (for stable pressure) - Stilling chamber (for even profile) - Swing Back wall (for easy cleaning) - Turbulence generator (for good sheet formation) - Edge Master (for stable stock on wire) - Module Jet (for good profile)
    15. 15. MasterJet F/B with directly flanged-on header Turbulence generator Slice nozzle Slice lip Bottom lip HC header (Top Layer & Under Top Layer)
    16. 16. Good Distribution The parabolic header and pressure drop in turbulence generator make uniform distribution.
    17. 17. Pulsation Damper Ball valve Solenoid valve Water line Compressed-air line Pneumatic Control cabinet Pressure control valve Throttling valve Pressure relief valve Slice-blade valve Overflow vessel Supply Light source Sequence Reduction of pulsation in stock line
    18. 18. Pulsation Damper Overflow bore Compressed-air cushion Suspension Supply Perforated-hole plate Compressed air connection Outlet A evacuating compressed air B evacuating suspension Pressure drop in perforated plate and cushion of compressed air reduce pulsation. Compressed air and overflow keep the level automatically.
    19. 19. Turbulence Generator with exchangeable Inserts Insert at inlet for spec. pressure drop and micro turbulence M icro turbulence make good sheet formation View A View A
    20. 20. Pictures of a Turbulence Tube Block
    21. 21. Turbulence generator with lamella fixing device (Top Layer Only) Turbulence generator Lamella Slice lip Bottom lip Top-lip beam This picture is sample. Top layer HB has only 2 Lamella.
    22. 22. Lamellas in the Headbox Nozzle (Top Layer Only) short lamella with smooth tip long lamella with structured tip This picture is sample. Top layer HB has only 2 Lamella.
    23. 23. Lamella make stabile jet for good sheet formation
    24. 24. Bottom lip Fixing bolt spacer Bottom-lip fixing bolt Supporting plate Bottom lip Installation lever Spacer/guide plate Rod head Screw jack element Bottom lip can move to adjust the Jet landing
    25. 25. The Problem of Jet Impingement wrong Jet landing point is adjusted with bottom lip extension
    26. 26. MasterJet F/B with ModuleJet Slice lip ModuleJet LC header HC header Bottom lip Slice nozzle Turbulence generator Stilling chamber (Back Layer)
    27. 27. ModuleJet Unit (Back Layer only) ModuleJet Unit mix the stock and white water to control the consistency in Headbox
    28. 28. ModuleJet Unit and Header
    29. 29. ModuleJet Valve
    30. 30. The Problem of CD-Profile Control BW with slice BW with dilution Control BW control with Slice disturb the jet direction BW control with Dilution keep the jet direction
    31. 31. Misalignement of Fibers through Slilce Blade Fib er orientation TS Jet direction DS Slice geometry v wire v wire v jet v jet BW control with Slice disturb the jet direction.
    32. 32. Profilmatic M – Hardware Overview Telephone Power Data Link QCS (Profiles, ...) Power 24 VDC Actuator- Bus CD Control Headbox Dilution Water Stock Cable VPAH Supply Cable Customer Supply DCS Setpoint Differential Pressure Recirculation PDIC PT PT ModuleJet valves are controled with Profilmatic M SIC
    33. 33. ModuleJet – Headbox Installation Connecting boxes ( stainless steel ) Power Distribution Boxes
    34. 34. Profilmatic M Profilmatic M control ModuleJet valves with Profile data from QCS
    35. 35. Operation <ul><li>Start up </li></ul><ul><li>Shut down </li></ul><ul><li>Adjusting </li></ul>
    36. 36. Operational Data 89 NONE Back Layer Under Top Layer 30 4 – 44 Approx.3 - 21 125 30 4 – 44 Approx.3 – 20.8 125 30 Slice dajustment device (PC) NONE ModuleJet Unit(PC) 4 – 44 Bottom lip extension(mm) Approx.3 - 17 125 Slice Opening (mm) Max. Slice Opening to service Top Layer
    37. 37. Operational Data Back Layer Under Top Layer 48.2 – 127.1 6.9 – 20.1 166.5 – 232.8 0.63 – 0.78 0.63 – 0.78 23.4 – 57.4 7.7 – 18.7 NONE 0.70 – 0.90 0.63 – 0.78 11.8 -65.9 4.0 – 24.7 NONE Pressure drop in HB HC(kPa) Pressure drop in PD HC(kPa) Pressure drop in HB LC(kPa) 14 - 78 Static Head in the Nozzle(kPa) 0.30 – 0.80 Consistency in Headbox (%) 0.50 – 0.87 Total Retention (%) Top Layer
    38. 38. Start Headbox <ul><li>Prerequisites </li></ul><ul><li>Ensure, that all cleaning covers are closed. </li></ul><ul><li>after longer downtime, activate the headbox heating (6 preheating hours) </li></ul><ul><li>Ensure, that header (or back wall), and deckle plates are closed and all screws are tighten. </li></ul><ul><li>Ensure, that manhole of PD tank are closed and hanble is tighten. </li></ul><ul><li>Check operational reliability of limit switch of top lip beam adjustment. </li></ul>
    39. 39. Start Headbox <ul><li>Adjust lip opening </li></ul><ul><li>Open slide valve of stock feeding pipe </li></ul><ul><li>Open valve of headbox recirculation pipe </li></ul><ul><li>Open valve of compressed air to PD tank </li></ul><ul><li>Start LC screen (Back layer only) </li></ul><ul><li>Start HC screen </li></ul><ul><li>Ensure, that the former is ready-to-operate </li></ul><ul><li>Open shower valves </li></ul><ul><li>Enter machine speed, jet-wire-difference, lip opening, ... into the PLS. </li></ul><ul><li>Activate LC fan pump (Back layer only) </li></ul><ul><li>Activate HC fan pump, when the LC-line is running stable. </li></ul>
    40. 40. Start Headbox <ul><li>Check after Start </li></ul><ul><li>Check pressure difference at the header. Correct it, if necessary. </li></ul><ul><li>Check stock level of PD tank . Correct it, if necessary. </li></ul><ul><li>Check stability of the jet </li></ul><ul><li>Check required static head with indicated static head. If necessary, correct it. </li></ul><ul><li>Check that the edge of jet is straight . If necessary, correct it. </li></ul>
    41. 41. Shut Down Headbox <ul><li>Close slide valve of stock feeding pipe The headbox will be flushed with white water. </li></ul><ul><li>Stop HC fan pump after 5 minutes </li></ul><ul><li>Stop LC fan pump after 1 minute (Back layer only) </li></ul><ul><li>Close shower valves, when the wire stops </li></ul><ul><li>Close slide valve of headbox feeding pipe </li></ul><ul><li>Hose down the nozzle area and the nozzle </li></ul><ul><li>Close valve of compressed air to PD tank </li></ul><ul><li>Preparing for longer downtime: - Empty and clean the headbox </li></ul>
    42. 42. Headbox Operation panel Vertical adjustment Horizontal adjustment Slice opening is displayed on HB operation panel
    43. 43. Top-lip beam vertical adjustment Hinged joint Top-lip beam vertical adjustment Worm shaft Slice opening is adjusted with worm jack on HB
    44. 44. Swiveling away the deckle plate Measuring pin Measuring unit for slice-opening size determination Deckle plate Hex. bolts Hinge Side section Slice opening is measured with measuring unit on deckle plate
    45. 45. Bottom lip extension Top-lip beam Slice lip Apron board Bottom lip l = Bottom lip extension r = Stick down s = Slice opening
    46. 46. Bottom lip extension Fixing bolt spacer Bottom-lip fixing bolt Supporting plate Bottom lip Installation lever Spacer/guide plate Rod head Screw jack element Bottom lip extension is adjusted with worm jack in HB
    47. 47. Display unit for the bottom lip position Side Section Scale Deckle Plate Bottom lip position is shown with scale on side section (not displayed on operation panel)
    48. 48. Breast roll shower Nozzle platelets Breast roll Breast roll shower
    49. 49. Pressure-difference in Nozzle (Top and Under Top Layer) Flushing line Headbox Recirculation valve Recirculation line Flushing line Ball valve Flushing line Pressure-difference transmitter Flow rotameter Check Differential pressure with transmitter. Adjust Differential pressure with Recirculation valve.
    50. 50. Differential pressure in Header (Back layer Only) Valve Measuring line Three-way cock Three-way cock Pressure difference Sight glass Recirculation valve Sample-taking opening Header Position A : Pressure equilibrium check of pressure difference display Position B : Flushing Position C : Sample taking Position D : Resting position Check Differential pressure with sight glass. Adjust Differential pressure with Recirculation valve.
    51. 51. Edge deckle “EdgeMaster” Edge master improve the straightness of jet in edge area
    52. 52. Fastening and locking of nuts Fastening bolt Adjusting bolt (vertical lifting/lowering) Adjusting screw (swiveling vertically)
    53. 53. EdgeMaster - elevation on front side Adjusting bolt (vertical lifting /lowering) Adjusting screw (swiveling vertically) Fastening bolt Shower EdgeMaster bottom edge Edge protection Adjusting screw (swiveling horizontally) EdgeMaster Breast roll Adjusting bolt (vertical lifting /lowering) Deckle plate Sealing water distributor Hose coupling
    54. 54. Adjustment of EdgeMaster Basically, 3 directions of adjustment A , B and C of the EdgeMaster are possible:  Vertical lifting / lowering ( A approx. ± 5 mm (approx. 0.2 inch))  Vertical swiveling ( B approx. ± 4 mm (approx. 0.1575 inch) at the EdgeMaster end) Caution: Do not exceed.  Variation of the outlet width ( C approx. ± 5 mm (approx. ± 0.2 inch) at the EdgeMaster end)
    55. 55. Slice-lip adjustment Cup spring stuck with washer Collar screw Hex. nut Connector Slice lip Long spindle Adjusting machine Slice lip is adjusted with handles. Slice lip can’t control the BW profile during ModuleJet is running.
    56. 56. Slice lip adjustment and Fiber orientation Fib er orientation TS Jet direction DS Slice geometry v wire v wire v jet v jet Slice lip is adjusted to arrange Jet direction for fiber orientation.
    57. 57. Pulsation Damper Ball valve Solenoid valve Water line Compressed-air line Pneumatic Control cabinet Pressure control valve Throttling valve Pressure relief valve Blade valve Overflow vessel Supply Light source Sequence
    58. 58. Pulsation Damper Overflow bore Compressed-air cushion Suspension Supply Perforated-hole plate Compressed air connection Outlet A evacuating compressed air B evacuating suspension Level is kept in too high -> Increase Air pressure Level is kept in too low -> Decrease Air pressure Up down is too big -> Close Blade valve Close Throttling valve
    59. 59. Maintenance 1. Change Seal 2. Change ModuleJet Valve 3. Remove Lamellas 4. Install Lamellas
    60. 60. Maintenance 1. Change Seal 2. Change ModuleJet Valve 3. Remove Lamellas 4. Install Lamellas
    61. 61. Hydraulic Unit (3 Headboxes share this one) Long hose - Connect to the port in tender side of each Headbox Control lever
    62. 62. Header (Top and Under Top layer) Header (closed) Flange bolt for header (flange closed: A) Flange screw for header inserted on flange   back side (flange open: B) Hex. nut M24 / Md = 400 Nm Flange bolt for the turbulence generator Sealing surfaces Flange bolt for the turbulence generator Hex. nut M24 / Md = 400 Nm Hydraulic cylinder Header (opened)
    63. 63. Flange for Header (Top and Under Top Layer) Sealing surface Flange bolt for header (flange closed: A) Flange screw for header inserted on flange back side (flange open: B)
    64. 64. Open the header 1. Connect the hoses of hydraulic unit to port of headbox. 2. Turn hydraulic pump and set lever to close . 3. Turn out all flange bolts for the header. 4. Turn out and remove nuts. 5. Set lever of hydraulic unit to open.
    65. 65. Close the header 1. Connect the hoses of hydraulic unit to port of headbox. 2. Clean sealing surfaces before closing. 3. Set ever of hydraulic unit to close. 4. Pull header with nuts. 5. Insert and tighten all flange bolts for the header.
    66. 66. Back wall (Back layer only) Bolts (1) Bolts (2) Back wall (closed) Back wall (open) Back-wall hinge Distributor bar Hydraulic cylinder Bolts (3)
    67. 67. Open the back wall 1. Connect the hoses of hydraulic unit to port of headbox. 2. Turn hydraulic pump and set lever to close . 3. Turn out all bolts(1) and (2) of back wall. 4. Unscrew all bolts(3) and turn them back into distributor bar. 5. Set lever of hydraulic unit to open.
    68. 68. Close the back wall 1. Connect the hoses of hydraulic unit to port of headbox. 2. Clean sealing surfaces before closing. 3. Set ever of hydraulic unit to close. 4. Pull the back wall against the stop by bolts(1) and (2). 5. Insert bolt(3) and fasten them with torque 120Nm. 6. Tighten bolt(1) and (3) with torque 120Nm.
    69. 69. Swiveling away the deckle plate Measuring pin Measuring unit for slice-opening size determination Deckle plate Hex. bolts Hinge Side section
    70. 70. Open the deckle plate 1. Remove all red hex. Bolts fir deckle plate fastening. 2. Swivel the deckle plate horizontally open. Carefully put the measuring device out from the measuring pin at top lip beam. Close the deckle plate 1. Clean sealing surfaces before closing. 2. Close the deckle plate. Carefully insert the measuring device into the measuring pin at top lip beam.
    71. 71. Open the deckle plate Measuring pin Measuring unit for slice-opening size determination Deckle plate Hex. bolts Hinge Side section Change of seals in top-lip beam, slice lip and deckle plate
    72. 72. Change of seals in top-lip beam, slice lip and deckle plate Turbulence generator Seal for the top-lip beam Top lip beam Slice lip Bottom lip Apron Board Bottom-lip seal Seal for the turbulence generator Open the deckle plate
    73. 73. Change of seals in top-lip beam, slice lip and deckle plate 1. Dismount deckle plates. 2. Pull old seals out of the grooves. 3. Clean groove bottom. 4. Bond new seals into groove bottom. 5. Install the deckle plate.
    74. 74. Open Header (Top and Under Top layer) Header (closed) Flange bolt for header (flange closed: A) Flange screw for header inserted on flange   back side (flange open: B) Hex. nut M24 / Md = 400 Nm Flange bolt for the turbulence generator Sealing surfaces Flange bolt for the turbulence generator Hex. nut M24 / Md = 400 Nm Hydraulic cylinder Header (opened) Change of seals in header
    75. 75. Open Back wall (Back layer only) Bolts(1) Bolts(2) Back wall (closed) Back wall (open) Back-wall hinge Distributor bar Hydraulic cylinder Bolts(3) Change of seals in back wall
    76. 76. Change of seals in header or back wall 1. Open the header or back wall. 2. Pull old seals out of the grooves. 3. Clean groove bottom. 4. Bond new seals into groove bottom. 5. Close the header or back wall.
    77. 77. Maintenance 1. Change Seal 2. Change ModuleJet Valve 3. Remove Lamellas 4. Install Lamellas
    78. 78. Open cover sheet Support Cover sheet Supporting frame
    79. 79. Change of valve insert Valve insert Seal/Mounting plug Connecting bushing Mixing chamber Screw Throttle Distributor block Motor Screw Fork and sealing ring (valve housing) Sealing ring (valve rod) Screw Holding plate Valve insert Valve body Screw Sealing ring
    80. 80. ModuleJet Valve Change <ul><li>remove electrical plug-in connections </li></ul><ul><li>loosen screws inside the fork approx. 1 turn with a hexagon socket wrench (pic. 1) </li></ul><ul><li>Pull out the fork to the side (pic. 2) </li></ul>
    81. 81. ModuleJet Valve Change <ul><li>Remove valve insert complete with motor (pic. 3 + 4) </li></ul><ul><li>Insert new valve insert (the last 2-3 mm are somewhat difficult). </li></ul><ul><li>re-insert fork </li></ul><ul><li>Tighten the screws with hexagon socket wrench </li></ul><ul><li>Reinstall electrical plug-in connections. </li></ul>
    82. 82. Mech. Position Display Gear Linear force: ± 500 N Linear travel: ±15 mm Rev. Backlash: 0.1 mm ProfilTronic Intelligent Motor Control Status Display Stepper Motor Lin. travel: 0.5 mm/rev. Power: 24-28 V, 1A Steps: 200/ revolution Speed: 1rev./sec (200Hz) Module Jet – Actuator LVM-3
    83. 83. Maintenance 1. Change Seal 2. Change ModuleJet Valve 3. Remove Lamellas 4. Install Lamellas
    84. 84. Open Deckle Plate Measuring pin Measuring unit for slice-opening size determination Deckle plate Hex. bolts Hinge Side section Remove Lamellas
    85. 85. Deckle Plate opened. Turbulence generator Lamella Slice lip Bottom lip Top-lip beam Remove Lamellas This picture is sample. Top layer HB has only 2 Lamella.
    86. 86. Bring the Transport Box Lid to the Headbox Remove Lamellas
    87. 87. Pull the lamellas out of the Headbox and place them on the Transport Box Lid, continuously fitting the Edge Protector . Remove Lamellas
    88. 88. Lift the Lamellas out of the Transport Box Lid and place in the Shipping Case. Lift simultaneously - Avoid Deformations. Remove Lamellas
    89. 89. Cleaning of Lamellas Lamella holding unit Lamell a
    90. 90. Remove the suction Lifters. During the Transport remains the Edge Protector on the Lamella Tip. Remove Lamellas
    91. 91. Removal/mounting of the edge protection Lamella Edge protection
    92. 92. Wrap the Lamellas in their original Wrapping and store them so that they are protected. Remove Lamellas
    93. 93. Maintenance 1. Change Seal 2. Change ModuleJet Valve 3. Remove Lamellas 4. Install Lamellas
    94. 94. Install Lamellas Unpack the Lamella Note: In the presentation lamellas in blue and transparent were used. Color depends on the ordered material.
    95. 95. Edge Protector Remains on the Lamella Tip Install Lamellas
    96. 96. Installation Sequence Observe: The „first“ lamella in the nozzle is the „last“ lamella on the transport box lid. Last lamella First lamella First lamella Last lamella
    97. 97. Fit Suction Lifters to the Lamella Install Lamellas
    98. 98. Lift the Lamella Out of the Shipping Case Lift Simultaneously - Avoid Deformations Install Lamellas
    99. 99. Place Lamella on the Transport Box Lid. (Place all the lamellas in the same way on the transport box lid.) 1 Lamella 2 Transport box lid 3 Lamella Install Lamellas
    100. 100. Check Direction of Installation <ul><li>The chamfer of the lamella tip points in the direction of the top-lip beam. </li></ul>Install Lamellas This picture is sample. Top layer HB has only 2 Lamella.
    101. 101. Bring the Transport Box Lid to the Headbox Install Lamellas
    102. 102. Pull the Lamellas out of the Transport Box Lid and push them into the Grooves. Install Lamellas This picture is sample. Top layer HB has only 2 Lamella.
    103. 103. Continuously remove the Edge Protector while pushing in the Lamellas. Install Lamellas
    104. 104. Push the Lamellas in completely to the Drive Side. Install Lamellas This picture is sample. Top layer HB has only 2 Lamella.
    105. 105. Center Lamellas: Measure the distance from the outlet width and align them. Install Lamellas This picture is sample. Top layer HB has only 2 Lamella.
    106. 106. Troubleshooting
    107. 107. Contact Voith for support. Headbox operated below minimum layout limit <ul><li>Flushing before each shut-down </li></ul><ul><li>Cleaning procedures according to operation manual </li></ul><ul><li>Boil-out </li></ul>Insufficient cleaning Optimization of the retention-aid system with chemical supplier Poor retention of trash/binders etc. creating agglomerates Adapt biocide-dosage or -type Excessive micro-biological activity Contamination/ build-ups/ holes or spots in the paper Troubleshooting Problem Illustration Possible Cases Solution
    108. 108. Spinnings Problem Illustration Possible Cases Solution Screen-basket defect Wrong type of screen-basket Insufficient cleaning <ul><li>Check screen for damages or clogging </li></ul><ul><li>Cleaning </li></ul>Contact Voith for Support <ul><li>Flushing before each shut-down </li></ul><ul><li>Cleaning-procedures according to operation manu al </li></ul><ul><li>Boil-out </li></ul>Troubleshooting
    109. 109. Contact Voith for support. Insufficient pressure difference between LC- and HC-Header <ul><li>Check position of slice-adjustment spindles </li></ul><ul><li>Measure slice opening profile with dial indicator </li></ul>Slice lip not correctly aligned (parallel with bottom lip) Cleaning according to operation manual Slice lip contaminated Change Slice-Lip Slice lip damaged or deformed by excessive adjustment Basis weight-profile defects (see also next page) Troubleshooting Problem Illustration Possible Cases Solution Scanner-measurement error Scanner-measurement error Check Scanner-noise with a single sheet or preferably a Mylar-sample
    110. 110. <ul><li>Check stability of retention-aid dosage </li></ul><ul><li>Check stability of ash dosage </li></ul><ul><li>Check level-stability in PM-chest </li></ul><ul><li>Check differential speed at thick-stock injection </li></ul><ul><li>Contact Voith for engineering assistance </li></ul>Consistency deviations in MD leading to problems in controlling the profile Check inserts for cracks and gaps - possibly increasing the pressure-loss in the tubes locally Turbulence generator insert defects See “contaminations” above Contamination <ul><li>Measure consistency in HC- and LC-Header </li></ul><ul><li>Increase retention </li></ul><ul><li>Check White water tank for sediments </li></ul><ul><li>Check engineering for back-flows (excessive consistency in LC-Line) </li></ul><ul><li>Contact Voith </li></ul>Insufficient consistency difference between HC and LC Basis weight-profile defects (see also previous page) Troubleshooting Problem Illustration Possible Cases Solution Constalip-hose Leakage or low pressure (For headboxes with Constalip-hose only) <ul><li>Check couplings </li></ul><ul><li>Check compressed-air supply </li></ul><ul><li>Change Hose </li></ul>
    111. 111. Operation only using short lamellas Excessive clearance between lamella and deckle-plate due to low operation temperature <ul><li>Change wire </li></ul><ul><li>Check function of cleaning showers </li></ul>Wire clogged or defect Change foils Dewatering-elements (forming-board) damaged Change Slice-Lip Slice lip damaged or deformed by excessive adjustment Jet-disturbances (general) Troubleshooting Problem Illustration Possible Cases Solution Slice sealing defect (side-sealing between slice-lip and deckle-plate) <ul><li>Change sealing </li></ul><ul><li>Remove (cut) parts of the sealing outside of the groove </li></ul>Jet-disturbances (edge) See “Jet-disturbances (general)” above EdgeMaster clogged or poorly adjusted <ul><li>Clean EdgeMaster </li></ul><ul><li>Optimize EdgeMaster </li></ul>
    112. 112. See “Contamination” above Clogging of turbulence-generator tubes <ul><li>Forming-roll vacuum low </li></ul><ul><li>Forming-roll clogged </li></ul><ul><li>(both in combination with formation defects) </li></ul>Forming-roll defects (Gap-former) Poor slice-opening alignment <ul><li>Optimize Profile through EdgeModule-adjustments </li></ul><ul><li>Optimize Profile through slice-lip adjustments </li></ul><ul><li>Contact Voith </li></ul>Profile not optimized Troubleshooting Problem Illustration Possible Cases Solution Speed-difference between jet and wire too low <ul><li>Perform rush/drag-trial to define the actual 0 </li></ul><ul><li>Optimize settings </li></ul><ul><li>Contact Voith </li></ul>Fiber-orientation profile-defects Poor forming-board alignment Wrong flow from EdgeModule- valves Check calibration (change) of flow-meters Check distance between forming-board and bottom-lip (horizontally and vertically) <ul><li>Check for deviations in slice opening profile </li></ul><ul><li>Check straightness of the bottom-lip </li></ul><ul><li>Contact Voith </li></ul>
    113. 113. Example of an operating curve

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