PAPER CHEMISTRY LABORATORY, INC.
.....the acknowledged leader in papermaking chemistry Instrumentation
One Washington Square  Suite 4G
LARCHMONT, NEW YORK 10538
 

	PHONE:	914 - 882 - 7781
E-MAIL:  john-penniman@papermaking-chemistry.com	FAX:	914 - 833 - 0843
	(ALTERNATIVE) FAX:	845 - 223 - 3789

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The Trial Zeta Data instrument is used to make on-line measurements of the zeta potential, specific conductance and temperature of a flowing sample from the downstream headbox recirculation line, as shown in the illustration. It measures the thoroughness of mixing of chemicals and stock, and outputs a Homogeneity Index.It enables on-machine, and laboratory, demonstration of the major importance of neutralizing the negative repulsive charge, after attaining homogeneity. Output is to a printer. The Trial Zeta Data is also conveniently used as a lab bench instrument. The measurement chamber is attached to a ring stand and inserted into a 1.5 liter stock sample in a 2 liter heavy wall beaker. The beaker rests on a heated magnetic stirrer. The quantitative effect of chemicals on zeta potential can be tested. Handsheets can be made to assess changes in physical properties. The Trial Zeta Data instrument applies a vacuum to draw stock against a screen and form a pad of fines, fibers (and fillers) between two electrodes. The further application of vacuum draws white water through the pad. The moving fluid displaces the mobile portion of the double layer and creates a measurable difference in potential between the two electrodes. This “streaming potential” is applied to the Helmholtz Smoluchowsky equation together with the system parameters, including measured conductance and temperature, to calculate the zeta potential. Measurement of streaming potential utilizes the complete stock, making it highly attractive for wet end process chemistry development and control. Use of the Mark V Dynamic Hand Sheet Mold is appropriate for making experimental handsheets.

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