US 12,350,131 B2
Method for measuring absorbent hygiene products
Udo Schlemm, Hamburg (DE)
Assigned to TEWS ELEKTRONIK GMBH & CO. KG, Hamburg (DE)
Appl. No. 16/322,298
Filed by TEWS Elektronik GmbH & Co. KG, Hamburg (DE)
PCT Filed Aug. 1, 2017, PCT No. PCT/EP2017/069460
§ 371(c)(1), (2) Date Jan. 31, 2019,
PCT Pub. No. WO2018/024736, PCT Pub. Date Feb. 8, 2018.
Claims priority of application No. 102016114286.7 (DE), filed on Aug. 2, 2016.
Prior Publication US 2019/0175421 A1, Jun. 13, 2019
Int. Cl. G01N 22/02 (2006.01); A61F 13/15 (2006.01); G01N 22/04 (2006.01); G01N 33/36 (2006.01); A61F 13/53 (2006.01)
CPC A61F 13/15658 (2013.01) [A61F 13/15203 (2013.01); A61F 13/15772 (2013.01); G01N 22/04 (2013.01); G01N 33/362 (2013.01); A61F 13/53 (2013.01); G01N 22/02 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for measuring absorbent hygiene products, the method comprising:
placing a plurality of absorbent bodies on a continuous web, wherein the absorbent bodies are spaced a distance from each other;
moving the continuous web through at least one microwave resonator;
measuring values of a shift in a resonance frequency and a spreading of the resonance frequency using the at least one microwave resonator to continuously determine the shift in the resonance frequency and the spreading of the resonance frequency;
determining at least one of moisture and density of the plurality of absorbent bodies based on the measured values of the shift in the resonance frequency and a spreading of the resonance frequency;
determining empty values for each of the measured values of the shift in the resonance frequency and the spreading of the resonance frequency, wherein the empty values are determined by continuously determining a local minimum value and averaging the continuously determined local minimum value with a plurality of past values of local minima; and
subtracting the average local minima as the empty values from the measured values of the shift in the resonance frequency and the spreading of the resonance frequency to evaluate the measured values of the shift in the resonance frequency and the spreading of the resonance frequency to account for the distance between the absorbent bodies.