Conductive nylon, a new development in the brush industry, is a non-marking synthetic brush fiber that can take the static charge created by the brushing action and send it to the ground where it belongs. Loose particles are free to be vacuumed away and brush action is free of residues that typically clog and restrict bristle action. It is available in a variety of sizes that are not available in natural fibers, it has better wear characteristics, and it is priced competitively.
Do you have a static problem that is frustrating you? Are natural fibers doing a good enough job or is it time to reevaluate your application and see if Conductive nylon is right for your application?
We encourage you to contact us for further information and to discuss your specific application. This could be a real breakthrough in dealing with one of your chronic problems, Static.
Doctor Roll Dampening
Doctor Roll Dampening has become a highly sophisticated method of applying moisture to a web traveling at extremely high speed. The system is used in the manufacture of paper and is an integral part of most offset printing systems. The same brush and pick-up roll configuration is also used to dispense adhesives, waxes, and powders.
Normally, the pick-up roll which is usually rubber covered, and the cylinder brush are both variably speed driven. This feature insures absolute control of moisture content applied to a traveling web. The pick-up roll runs at a comparatively low speed (30 to 100 rpm) while the cylinder brush rotates at a much higher speed (800 to 1200 rpm).
Typical Sizes of Common Parts
|
BRUSH
|
PICK-UP
ROLL
|
| Diameter - 12" | Diameter - 6' to 8' |
| Fill - .012" Nylon (2" projection) | Covering - Rubber |
| Pattern - Mediun Dense (Fineset) | Durometer - Bone Hard |
| Speed - 800 - 1200 rpm | Speed - 30 - 100 rpm |
The rubber pick-up roll carries a fine film of water which, when flicked by the counter rotating brush, becomes atomized and thrown toward the web. Contact between the two rotating bodies is generally very slight and in most cases is only 1/32" impingent. The dispersion of moisture is very fine and appears as a cloud or mist of extremely small moisture particles. Avarage amounts of moisture application range from 12% to 20% by weight. Brush sizes from The Industrial Brush Company range from several feet, to over twenty (20) feet long.
Flicker Blade Dampening
Flicker Blade Dampening is a relatively simple method of applying maximum moisture to a slow moving web. The system requires a holding pan, power driven brush, and stationary doctor blade assembly. It can also be used to disperse adhesives, waxes and powders.
The cylinder brush becomes the moisture pick-up vehicle as it rotates in the holding pan. Average brush speed varies from 60 to 200 rpm. The flicking action of the bristles against the stationary doctor blade dispurses fine moisture droplets. Flicker blade impingement is generally 3/32" to 1/8". The distance between the traveling web and the brush and blade point of contact should be 4" to 6" . As the distance decreases, dispersion becomes more uniform.
The system provides for greater quantities of moisture dispersion than Doctor Roll Dampening, but lacks uniformity and accuracy. Moisture application levels range from 30% to 70%.
Flicker Blade Brushing
Rotary cylinder brushes have been used for years to remove lint, excess flock, or any other undesirable particle or substance from a moving web. A power driven brush, by virtue of the fact that it is an endless revolving cylinder, tends to carry or load some of the brushed particles into itself, rather than releasing all of them each revolution. The cylinder brush then becomes loaded or as contaminated as the web it is brushing, and tends to re-deposit the particles back on to the web.
The flicker blade used in conjunction with a vacuum system tends to eliminate the loading problem. The blade is set into the revolving brush at approximately 90 dedgrees, after the brush point of contact with the traveling web. The blade should be heavy enough to maintain rigidity depending on the web, brush, and blade width, and should create slight interference (3/32" to 1/8") with the tips or revolving bristles. The bristles passing by or striking the flicker blade tends to flick or release the impurities picked up from the web. These impurities are effectively removed by the hooded vacuum system.
The most common bristle pattern used to remove undesirable particles from a moving web is a spiral configuration. Multiple spirals are generated in a gentle arc along the length of the brush surface. The spirals tend to be self-cleaning, create a definite wind pattern, and are easily cleaned after prolonged use. Densly filled brushes may be used for ultra-fine particle removal as long as those particles are dry and not tacky.
The "A" alternate method for web cleaning tends to open up the web to a maximum degree, assuring deep down cleaning action. The vacuum system (hood) should be designed to fit the exact configuration of the web angle. Both systems can be utilized to clean either the top or bottom of a traveling web, as well as vertical brushing.
The diagrams illustrate a typical brush and flicker blade installation mounted on a traveling web. The vacuum hood, brush, and bar assembly are incorporated to effectively remove undesirable particles from the web.
Figure 2
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Antistatic Brushes
Friction has always been responsible for creating static and brushing has always been a sure way to increase static charges. Static charges build up on both the brush and the finished product ultimately clogging the brush and re-depositing loose particles on a clean product. Sometimes these charges create unsafe environments where a spark can start a fire or explosion. In the past, there have been many good ideas for dealing with static. Natural fibers, such as Tampico, Horsehair, and Boarshair do not create as much static as synthetics, therefore they have been the fiber of choice. However, they are not a guarantee against static build up and they have a limited degree of stiffness. Historically they do not last as long as synthetic fiber but they have been all that has been available.
