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Paper humidity sensor and its application

A humidity sensor and paper technology, applied in the direction of material resistance, can solve the problems that the sensor cannot be closely attached, the humidity sensor cannot be used to sense the humidity of paper, etc., and achieves the effects of short measurement time, simple structure and low cost.

Inactive Publication Date: 2003-01-08
SHANGHAI BANKNOTE PRINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned shortcoming of the background technology is that the humidity sensor cannot be used to sense the humidity of the paper: 1, the flexible structure, the sensing part of the sensor cannot be closely attached to the paper surface; 2, the paper is too thin, the sensing part of the sensor, that is, the probe Cannot be inserted inside the paper

Method used

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  • Paper humidity sensor and its application
  • Paper humidity sensor and its application
  • Paper humidity sensor and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A kind of paper humidity sensor 1, it is characterized in that, the parameter of additional part is: the outer electrode circle 102 is the circular ring that inner diameter, outer diameter and thickness are respectively 14mm, 20mm and 4.5mm; Inner electrode circle 101 is outer diameter and thickness respectively 8mm and 4.5mm discs, the inner electrode ring 101 and the outer electrode ring 102 are installed concentrically, the lead wire 12 is a coaxial cable, and the plug CT is a coaxial cable plug.

Embodiment 2

[0026] One of the applications of the paper humidity sensor 1, a figure 2 , 3 The paper hygrometer composed of the circuit shown is characterized in that the parameters of the components are:

[0027] Amplifier 2: Transistors BG1 and BG2 are 3DO14, the resistance values ​​of resistors R1, R2, R3, R4, R5 and R6 are 200M, 2M, 6K8, 6K8, 68K and 51M respectively, and the resistance values ​​of variable resistors W1 and W2 are respectively 6K8, 100K, the capacities of capacitors C1 and C3 are 680P and 12μF respectively, the full-scale current of ammeter M is 100μA, and the socket CZ is a coaxial cable socket;

[0028] DC power supply 3: switch K2 is a double-pole three-throw switch, switch K2b and its contacts 1, 2, and 3 are part of switch K2, and the voltage of dry battery or Ni-Cd battery pack B is 12V.

Embodiment 3

[0030] The second application of the paper humidity sensor 1, a kind of figure 2 , 4 The paper hygrometer composed of the circuit shown is characterized in that the parameters of the components are:

[0031] Amplifier 2: Transistors BG1 and BG2 are 3DO14, the resistance values ​​of resistors R1, R2, R3, R4, R5 and R6 are 200M, 2M, 6K8, 6K8, 68K and 51M respectively, and the resistance values ​​of variable resistors W1 and W2 are respectively 6K8, 100K, the capacities of capacitors C1 and C3 are 680P and 12μF respectively, the full-scale current of ammeter M is 100μA, and the socket CZ is a coaxial cable socket;

[0032] DC power supply 3: The switch K2 is a double-pole three-throw switch, the switch K2b and its contacts 1, 2, and 3 are part of the switch K2, the capacity of the capacitor C2 is 12μF, the voltage-stabilizing integrated circuit IC is 78L12, dry battery or Ni- The voltage of Cd battery pack B is 18V.

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Abstract

A paper humidity transducer contains an inside electrode circle 101 and an outside electrode circle 102 made of conductive silicon rubber. When testing moisture, the said two circles closely attach to the surface of paper sample and the transducer is equal to a resistant value related to the paper sample humidify to be tested of a resistor. The sample paper humidity will be calculated after testing the resistor value. Appliance: the said transducer, amplifier 2 and DC power source 3 are composed of a paper moisture test device and amplifier 2 is a source FET follower DC differential amplifier and the DC power source 3 contains batteries or Ni-Cd battery group B, especially suits for testing humidty of printed paper.

Description

technical field [0001] The invention relates to a paper humidity sensor and its application, and belongs to the technical field of paper humidity sensors and paper humidity measurement. Background technique [0002] The paper has different humidity, and the paper size is also different. The paper with high humidity has a large size, and vice versa. If you print on paper with humidity that does not meet the requirements, the color registration of the printed matter will be inaccurate. Excessive humidity of the paper will also affect the ink used for printing, causing color loss and dragging of the printed matter after printing. Therefore, printing factories, especially banknote printing factories, must use paper moisture meters to measure the humidity of printing paper in key printing sections, so as to monitor and control the humidity of printing paper and ensure the printing quality of printed products. [0003] To measure paper humidity, a humidity s...

Claims

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Application Information

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IPC IPC(8): G01N27/04G01N27/12
Inventor 王洪波邱玲沈焕刚
Owner SHANGHAI BANKNOTE PRINTING
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