Sample Technical Report
Version anglaise disponible seulement

 

Customer P.O. No. :
..
Project No. :
..0000
Date :
..December 11, 2000

Table of Contents
Cover page and executive summary
Table of contents
Introduction
References
Inspection & Alignment Results
Recommendations
Appendix : Tolerances & Benefits of Alignment
Drawing #


 

Executive summary



In this box, you will generally find an overview of what was done during the project.
The following pages of this sample report contains information that is setup in a usual customer report. In addition, we have included several examples of what MASI can do for you and your machine.

For your next shutdown, please consider a team of professional with over 50 years of combined experience in the paper mill industry and alignment business. Call us at (514) 933-MASI (6274).

 


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CONFIDENTIALITY NOTICE

 

Please note that information contained in this document is the exclusive property of MASI, and is not to be copied, transmitted or distributed for any purpose. This document is provided solely for the discretionary use of promotion.

 

 


A short paragraph is usually found in this section containing information on the mill contact and a brief description of the reason for our visit.

 

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The references usually used by our optical team are:

  • Level (Vertical) Attribute - Level to earth

  • Square (Horizontal) Attribute -- The monuments of the machine that represents the offset machine centerline. You are not sure that you have such a line, no problem, MASI can help you establish such a line. Please ask us for details.

Throughout this report, data may be shown with arrows. The data indicates the position of the operator (tending) side of the component with respect to the drive side, as viewed from the tending side. The following sketch is inserted for details:







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Whether your fourdrinier is horizontal, vertical, with a top former or multiple tables, MASI's optical team as knowledge of all these types of fourdrinier, and we can setup easily any of our instruments to inspect any components. You are having problems with sheet formation or wire tracking, an inspection of the headbox, the breast roll, the couch, the wire turning rolls or table elements could help you find what the problem is. You are setting up new equipment, let us help you by making sure all proper steps for erection are followed.

The following is the typical information format you would see in our report:
  • An initial inspection of the apron lip showed that it was 0.061"‚ and 0.030". The breast roll was found to parallel to the breast roll for the level and perfectly perpendicular to the centerline of the machine.

  • Please refer to drawings for more details of what MASI can do for you in this section of your machine.



Section: Wet Press

(Refer to Drawing No. 0000-6 and 0000-7)


Straight thru press, "Twinver", "Tri-Nip", shoe press, whatever the type of press you have doesn't matter to MASI's optical team, because we have seen them all and know the peculiarities of inspecting and aligning each and everyone of them.
If you are experiencing dewatering problems, premature wear on coverings, web or felt tracking problems, you should make MASI's optical team part of your troubleshooting diagnostics. Optical inspection of presses can pin point the exact location where nips are in a scissor condition and eliminate this condition by proper alignment.
The following is the typical information format you would see in our report:
  • The granite roll of the first press was found to 0.008"‚ and perfectly perpendicular to the machine centerline. The suction roll, which nips horizontally with the fix roll, was 0.023"‚. A scissor condition of 0.015" is present in the first press. With proper roll diameter, the optical team can identify where the scissor condition occurs.

See the attached drawings for details.

 



Section: Dryer Section


(Refer to Drawing No. 0000-8 and 0000-9)





Although the dryer section appears to be straight forward, several alignment related problems can be found in this area. Amongst them you have: poor web and felt tracking, premature wear in felts, wear on gears and pinion, etc.. MASI as seen it all, let us help you in troubleshooting this area.

Attach you will find a drawing, which depicts alignment condition in a dryer section and the proposed action to correct these. Also you will find the alignment portrait of a complete section.


Section: Coater and Calender


(Refer to Drawing No. 0000-10)





A regular size press, transfer roll coater or gate coater alignment is not to be taken lightly. Especially when you consider the fact that you are about to wet the sheet once more. If any residual stress is found in the sheet, due to web tracking problems prior to the coater, the quality of the finish product will be affected. MASI will help you ensure that the your finish product is the best, by optimizing alignment of paper rolls and coater rolls to eliminate any undue stress in the sheet.

 


Calendering will transfer to your product the final physical properties wanted. The gloss or finish of the paper is very important to the printer or end-user, so you want to make sure that your equipment is optimized and up to the task. MASI's optical team as extensive experience with hard nip calenders, soft nip calenders and gloss calenders. We can help you optimize your calendering process and also help you track the history of your rolls in the calender. Typical analysis would be as such:

  • The "King" roll was perfectly aligned to the machine centerline and the level was 0.010"‚.

  • Using a parallel line of sight to the "King" roll, the remainder of the calender was aligned parallel to it. You will also find the calculated offset of the centerline on the drawing.

See drawings for examples.

 



Section: Reel


(Refer to Drawing No.











You finally have a machine that has been optimized due to alignment, but once your product arrives at the reel you have poor spool start-up. You are losing a lot of paper during spool transfer. This is generally due to the primary arms being out of synchronization with the reel drum. MASI is once again the most economical solution for you to troubleshoot the problem in this area. A simultaneous inspection of the reel and the spool will reveal if these two rolls are synchronized. Proper tension in the spool is also important, that is why you need to know if the secondary arms are also synchronized. Optical methods are still the best way to find out this inspect and align these components.



Section: Winder


(Refer to Drawing No.











Paper machines are going faster everyday and that is why winders are also going faster. You need your winder to be fully optimized to ensure maximum winding quality and to prevent any unexpected downtime. Therefore, you want to eliminate poor winding startup, dishing, interweaving between rolls, dusting, etc... MASI will help you in obtaining a proper alignment overview of the winder and will also help you set up the winder to tight alignment tolerances to ensure proper running of the winder.

 

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In this section, the client will find observations made by the optical team during our visit, pertaining to the machine. Also, since MASI has over 50 years of experience in the industry, we will make specific or general recommendations for any section that was inspected during our visit. MASI feels that the client deserves more than just numbers on paper and that is the purpose of this report: to let our client benefit from our experiences with similar problems found throughout our numerous visit to paper machines.

The following appendix contains general tolerances for alignment of several rolls and components of the paper machine. These are sensitive to the grade produced and the speed of the machine. In this example, a coated grade machine with speeds up to 3000 FPM was used.


MASI
generally recommends the following tolerances for alignment of (coated grade) paper machine components when the manufacturer's tolerances are not available:

  • Apron Lip: ±0.001 /foot of width, for both attributes. The apron should be adjusted to eliminate out-of-flat conditions of more than 0.002" between adjacent actuator locations. These adjustments will help the operator to produce a web that is more uniform in basis weight and caliper across the width of the machine.

  • Couch, Pick-up roll, Breast roll: ±0.001 /foot of effective roll face, for both attributes. The breast roll should be aligned parallel to the apron lip, and should be positioned at the proper location with respect to the apron lip. Proper alignment and positioning of this roll relative to the apron will help to ensure that desired stock delivery conditions are maintained.

  • Tension rolls, guide rolls, return rolls: ±0.0015 /foot of effective roll face, for both attributes, and centered within ±0.125" with machine centerline.

  • Press (nipping) rolls, calender rolls: ±0.001 /foot of effective roll face up to 0.010" for level-to-earth and perpendicular to the machine centerline. Nipping or adjacent rolls should be parallel to each other in order to minimize the ³scissors² condition to no more than 0.005".

  • Turning rolls, Pressure rolls, and Bowed rolls: ±0.0015 /foot of effective roll face, for both attributes and/or parallel to its adjacent component within a maximum of ±0.007", and centered within ±0.125" with machine centerline.

  • Dryer cans, felt tension/stretch rolls, felt guide rolls, carrier felt return rolls: ±0.0015 /foot of effective roll face, for both attributes, and centered within ±0.125" with machine centerline.

  • Dryer pinion and gears: gear root clearance should be set at 0.05 ­ 0.07" in order to minimize gear backlash.

  • Reel drum, primary & secondary arms: ±0.001 /foot of effective roll face, for both attributes; primary and secondary arms to be parallel to the reel drum up to a maximum of ±0.007".
The benefits of proper paper machine alignment are:

  • Increased dewatering efficiency, and hence reduced operating costs in the dryend

  • More consistent product formation

  • Improved product transfer to the press section, and thus fewer web breaks

  • Improved wire tracking

  • Increased wire life

  • Decreased wear of bearings, bushings, dryer gears, and other mechanical parts

  • Decreased foil and suction box wear

  • Improved microturbulence on the wire, which reduces flocculation and improves formation

  • Less tension on the wire so that the designed weave is not distorted

  • Elimination of baggy edges and wrinkles

  • Decreased felt wear

  • Minimization of rewetting

  • Elimination of stresses which tend to close the felt void spaces

  • Maintained felt porosity, which increases water removal efficiency

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# 0000-2


 

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# 0000-3

 

 

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# 0000-5






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# 0000-8

 

 

 

# 0000-9

 

 

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# 0000-10

 


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# 0000-11

 

 

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# 0000-12

 

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