As we have stated previously, we are going to be taking the ideas developed in this column over the last couple of years and developing them into design practices. This is how it works. We will provide the basic narrative here for one design practice each week. We will keep it open for comments for one month. After that, we will finish it in formal form and offer it for sale at a modest price. Here is where you come in. If you make a substantive contribution to a standard, the organization for which you work will be granted a pro bono license to use that standard with its current issue number for as long as you like. We have had good response so far! Contribute, please.
This week's: Shaking the Wire (LGM 2013.010.01 when issued)
Reference:
'Shaking the wire' is a technique used in the wet end section of the paper machine, consisting of shaking/vibrating the breast roll in the cross-machine direction.
Like old fashioned "Shaky Fourdriniers," these modern systems provide significant "squaring" of the sheet and allow lighter basis weights to achieve better technical properties, and eliminate additional stock prep capacity.
Benefits of implementing this technology include: Better formation, lighter basis weights and lower MD/CD tensile ratio.
Objective:
To implement 'Shaking the Wire' technology on paper machines. Consideration:
When the breast roll is shaken, shear forces are created on the web which breaks up flocs formed in the web. Flocs are caused by non-uniform distribution of fibers in the paper, leading to problems such as poor and uneven printing.
The shaking or vibrating action creates a homogeneous distribution of the fibers in the cross-machine direction, resulting in improved drainage and sheet formation; important factors that affect properties such as basis weight and MD/CD tensile ratio.
So, give us your comments by 9 April 13, please!
Still open for comments: Planetary Gearboxes (Open until 2 April 13) Still open for comments: High Voltage Systems (Open until 26 March 13) Still open for comments: FRP Tanks (Open until 19 March 13)
As always, your comments will be appreciated.
Think light!
Brian Brogdon, Ph.D.
Executive Director
[email protected]
or
Jim Thompson
Founder
[email protected]
-----
Send us your comments!
|
