Papermaker's Partner
this is a newletter from Paper Trade Associates
In This Issue
Importance of Stroke Rate/Length
Nozzle Reconditioning
Scanning Shower Pumping System
Gem Insert Nozzles
Moisture Streak Causes
Spray Boom Oscillation
Low Cost Scanning Shower
Quick Links
Oscillator Stroke Rate & Length
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Have you checked your showers' stroke rate lately?

If not, you really should. In most cases when we check the stroke rate we find it is improper. Usually the stroke rate is too fast.

Improper stroke length can lead to the following problems: poor felt performance, uneven moisture profiles, filling, felt wear, edge wear, and streaking to name a few.

The formula to use to check to see if you have the proper stroke rate is simple: machine speed (fpm)/ felt loop length (in feet) x (2 x nozzle diameter (in inches)

Paper Trade Associates would be glad to come in and do a complete shower survey at any time.
Nozzle Reconditioning
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Do you use long life Gem (Ruby, Sapphire or Cer-bide) type shower nozzles or trim squirts?

Do you use spring-purge or air-purge nozzles?

Do you throw out nozzles when you change them out because they get plugged or contaminated?

If you answered yes to any of the above questions we can most likely save you money.

Most of the time Gem, Spring Purge, and Air Purge nozzles can be inspected and reconditioned to like-new condition for a fraction of the cost of a new nozzle.
Scanning Shower Pump

Looking for a reliable high pressure low volume pumping system for your high-end scanning type dryer felt or backing roll shower? We have one!
Greetings!

Paper Trade Associates have been working with showering for clothing and rolls for almost 30 years. In this newsletter we will highlight several of the key fundamentals that get lost and forgotten.  Not maintaining these fundamentals can lead to poor clothing life, poor moisture profiles and uneven roll wear.

We hope you find this issue of Papermaker's Partner useful!
Gem Insert Nozzles: many benefits
  • insert nozzleLike better cleaning and life for your machine clothing?
  • Looking to reduce your water usage?
Replacing worn nozzles with Gem (Sapphire, Ruby or NEW Cerbide) insert nozzles will net you amazing results!

Gem Nozzles wear 5-10 times longer than common stainless steel  ones. When a wire cleaning shower on a 200" wide paper machine with .040" nozzles has their nozzles wear to .042" that shower will use almost 4 extra GPM or 1.9 extra gallons per year! Other water savings from using Gem Nozzles is due to improved jet integrity which allows showers to be operated at reduced pressure to get the same cleaning. Improve jet integrity will also lead to improved clothing life as well.

Worn nozzles in the above mentioned shower will cost the mill approximately $6,300/year in water, energy and sewer in additional costs!

Switching to Gem nozzles can save your mill big bucks$$$

Our nozzle reconditioning program can give you many years of life out of Gem nozzles as well. We will describe our reconditioning program later in this newsletter.
Clothing Moisture Streak Sources
Cooling Tower001
  • Do you have or get moisture streaks in your machine clothing?
  • Do you feel you get moisture profile streaks that are created in your press section?
 
A source for most of these streaks is from fan style lube or chemical showers. Redesigning the operation of these type of showers has been a very cost effective way to reduce sheet moisture variations.

In most cases resolution has been achieved by the addition of oscillation to existing showers. The primary cause is that fan nozzles DO NOT distribute fluids uniformly.  The edges of a fan nozzle spray is much heavier than the center of the spray. Thus, when a fan shower pipe is designed the spray pattern of the nozzles overlap.  These overlaps are where the moisture streaks are created.

Don't overlook press roll lube showers as well. Press roll lube shower can effect roll wear, doctor blade wear and sheet moisture.

Any shower arrangement can be redesigned to reduce the impact of these shower pattern variations.

When fan showers are redesigned felt life has been improved by as much as 50%, documented!
 
Yankee Spray Boom Oscillation

  • Do you oscillate your Yankee Spray Boom?
  • If not, you should be!
Benefits are much more even distribution of your coatings.  This will allow you to reduce the amount of coating you use. The other documented benefit is greater creping blade life and more even blade wear angles etc....
Economical Scanning Shower

Looking for a scanning type shower for dryer felts, backing rolls or other clothing applications? We have a system that is a fraction the cost of big named brands.
Let us know if you would like us to do a shower survey or come in to discuss issues you may be having. Our attitude is no issue or problem is too small.
 
Sincerely,
 
PTA logo
Paper Trade Associates
Chris Kellner cell 413-478-0560
Tom Morganstern cell 207-232-0685
Paper Trade Associates enjoy the challenge of figuring out machine showering and moisture profile problems. In many cases it is a small problem that can add up to big issues for the Papermaker.