Apparatus for determining percent of wet-end moisture removed

Claim 2

Apparatus as in claim 1 wherein each of said first and second basis weight signal generating means includes: a respective basis weight gauge operating in a given range and a respective repeat slide-wire potentiometer having a slider connected to the gauge for movement proportional to the operating variation of the gauge within said range to effect a zero potentiometer output at a given point in said range; respective biasing means connected to said potentiometer for causing a nonzero output from said potentiometer throughout said range; and said biasing means being respectively set in accordance with the respective ranges of the basis weight gauges.

Claim 3

Apparatus as in claim 1 wherein said arithmetic processing means operates in accordance with the formula BW1 - BW2 + M2 wherein BW1 and BW2 and M2 respectively represent said first and second signals, saId third signal is indicative of the percent moisture, and M2 represents the multiplication of said second and third signals.

Claim 4

Apparatus as in claim 4 wherein said arithmetic processing means includes adder and multiplying means for developing the numerator and denominator quantities of said formula and division means for dividing those quantities to obtain said output signal.

Claim 5

Apparatus as claim 5 including means for multiplying said second and third signals to obtain an M2 signal, means for inverting said second signal to form a -BW2 signal and wherein said adder means includes two adders one of which adds the said first signal and the -BW2 signal to form said numerator quantity, the other adds those signals and said M2 to form said denominator quantity.

Claim 6

Apparatus as in claim 6 including recording means responsive to said output signal and being connected to both of said adders for indicating the aforesaid moisture removed percentage at said first point, the unit weight of water removed between said points and the unit weight of moisture removed at said first point.

Claim 7

Apparatus as in claim 1 wherein said third signal is indicative of the percent moisture, and said arithmetic processing means includes: multiplying means responsive to said second and third signals for developing a fourth signal proportional to the quantity -BW2 (1- m2) wherein BW2 and m2 respectively represent said second and third signals; adder means responsive to said first and fourth signals to obtain a signal M1 representing the amount of moisture at said first point; means for taking the difference of said first and second signals to obtain a basis weight difference signal; and means for dividing said difference signal by said M1 signal to obtain said percentage moisture output signal.

Claim 8

Apparatus as in claim 8 wherein said multiplying means includes an operational amplifier having an input which receives said second signal and having feedback resistance means, and means for varying said resistance means in resistance at least approximately in accordance with the percent moisture variation of the material passing said second point to effect said multiplying.

Claim 9

In combination with apparatus wherein a traveling material is subjected to a moisture removal operation in passing from a first point to a second point: a basis weight gauge at each of said points; means responsive to said gauges for producing first and second variation signals indicative of the basis weight variations within the respective gauge calibration ranges; means for adding first and second biasing signals respectively to each of said first and second variational signals to produce first and second basis weight signals; an operational amplifier having an input receiving one of said basis weight signals; a moisture gauge at said second point; feedback means in said amplifier responsive to said moisture gauge for causing said amplifier to produce an amplifier output signal which varies jointly with the moisture content of said material and said one basis weight signal; and means responsive to said amplifier output signal and to the other of said basis weight signals for producing a resultant signal indicative of the moisture content of said material passing said first point.

Claim 10

Apparatus as in claim 10, further comprising: means or producing a signal indicative of the difference between said first and second basis weight signals; and means responsive to said difference signal and to said resultant signal for producing a signal indicative of the percent moisture removed from said material between said first and second points.

Claim 11

Apparatus a in claim 10 wherein said basis weight gauges at said first and second points have different calibration ranges, and wherein said added first and second biasing signals have mutually different values.