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Search :      Thursday, January 08, 2009


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High Viscosity Tapered Tip Needles from I&J Fisnar
Tapered plastic needles.
Fair Lawn, NJ — When dispensing high viscosity fluids with standard blunt-end tips, extra pressure is required to overcome the resistance when entering the straight needle tube; the amount of resistance will depend on the internal bore of the tube. The effect of this extra pressure to overcome the resistance is to introduce a tertiary element in the control of the dispensing process.

This tertiary element is the excess pressure needed, which shunts the fluid forward after the air pressure is released either from a syringe or valve, making an accurate deposit difficult or even impossible to achieve. A few high pressure valves have a snuff-back feature, but it is impossible to successfully apply snuff-back when using a syringe for high viscosity fluids.

The solution is to use a tapered dispensing needle — available from I&J Fisnar — , which is a molded plastic tapered design that prevents, or at least, effectively reduces the tertiary pressure phenomenon. These needles reduce the post-dispensing ooze that can be experienced with blunt-end tips, particularly when using high viscosity fluid requiring higher pressure to dispense.

For more information, contact: I&J Fisnar, Inc., 2-07 Banta Place, Fair Lawn, NJ 07410-3002 201-796-1477 fax: 201-794-7034 E-mail: info@ijfisnar.com Web: http://www.ijfisnar.com

See at APEX Booth #571.

 
 

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