WO2021088761A1 - Capteur de surveillance d'état d'absorption pour article absorbant jetable, produit et procédé associés - Google Patents

Capteur de surveillance d'état d'absorption pour article absorbant jetable, produit et procédé associés Download PDF

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Publication number
WO2021088761A1
WO2021088761A1 PCT/CN2020/125830 CN2020125830W WO2021088761A1 WO 2021088761 A1 WO2021088761 A1 WO 2021088761A1 CN 2020125830 W CN2020125830 W CN 2020125830W WO 2021088761 A1 WO2021088761 A1 WO 2021088761A1
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Prior art keywords
detection
absorption
electrode
monitoring sensor
excrement
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PCT/CN2020/125830
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English (en)
Chinese (zh)
Inventor
黄新凯
陈阵
徐菲
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黄新凯
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Priority claimed from CN202010410663.6A external-priority patent/CN111297567A/zh
Application filed by 黄新凯 filed Critical 黄新凯
Publication of WO2021088761A1 publication Critical patent/WO2021088761A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/42—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators with wetness indicator or alarm
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/42—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators with wetness indicator or alarm
    • A61F2013/424—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators with wetness indicator or alarm having an electronic device

Definitions

  • the invention relates to a sensor, in particular to a sensor for monitoring the absorption state of disposable absorbent articles, and related products and methods.
  • Disposable absorbent products include absorbent sanitary products such as diapers, paper diapers, toddler pants, changing pads, sanitary napkins, etc., referred to as absorbent products.
  • absorbent products such as diapers, paper diapers, toddler pants, changing pads, sanitary napkins, etc.
  • the instructions are also suitable for other absorbent products.
  • a diaper equipped with this sensor can be regarded as a smart diaper, which undoubtedly has a more user-friendly user experience and application effect than traditional diapers, and represents an important direction for the development of diapers.
  • smart diapers to be widely accepted and used by people, in addition to having a good user experience, it also depends on whether the price is cheap and whether it is convenient to produce.
  • the senor is regarded as a kind of diaper production material, it still has a requirement of versatility, because diapers have many different specifications and models. If the material is not universal, it must be prepared according to each specification and model, which will be diapers. Production brings great troubles. It is best that the same material can be adapted to the production of diapers of all models and specifications, for example, it has the ability to adapt to length, and the material can be cut off as needed during the production of diapers without affecting its performance.
  • the technical problem to be solved by the present invention is to provide a simple, reliable, versatile, low-cost smart diaper solution that is suitable for the traditional diaper production process and can realize the detection of the absorption state and the distinction between urine and feces.
  • the present invention provides an absorption state monitoring sensor suitable for use in a disposable absorbent article, and a disposable intelligent absorbent article that can provide information on the presence and absorption state of excrement.
  • the disposable intelligent absorbent article includes a surface layer, an absorption layer, a leak-proof layer, and the absorption state monitoring sensor.
  • the absorption state monitoring sensor is arranged on the surface layer or between the surface layer and the absorption layer, Or between the absorbent layer and the leak-proof layer, and realize the function of monitoring the excrement state and absorption state of the absorbent article, the absorbent layer includes a polymer absorbent material, and the surface layer includes a hydrophilic non-woven fabric,
  • the leak-proof layer includes a gas-permeable or gas-impermeable polyethylene film.
  • the absorption state monitoring sensor includes a first detection circuit, a waterproof protection mechanism, and an infiltration diffusion control mechanism.
  • the first detection circuit includes a first detection electrode and a second detection electrode. Including a protected electrode part and an unprotected electrode part, the protected electrode part is protected by the waterproof protection mechanism without direct contact with excrement, the unprotected electrode part is not affected by the waterproof protection mechanism Protection and direct contact with excrement; when excrement containing electrolyte liquid is present in the disposable absorbent article, it will cause the electrolyte liquid content of the absorbent material around the unprotected electrode portion to increase, and cause the The part of the unprotected electrode is infiltrated, so that an electric double layer capacitor will be generated between the first and second detection electrodes.
  • the capacitance of the electric double layer capacitor is the same as the part of the unprotected electrode by the electrolyte.
  • the surface area of liquid infiltration is positively correlated.
  • the electrolyte liquid will gradually diffuse in the protected electrode part under the action of the infiltration diffusion control mechanism, so that the area of the unprotected electrode part and the surface area infiltrated by the electrolyte liquid will gradually increase, thereby causes the capacitance value of the electric double layer capacitor to gradually increase, and the speed and amplitude of the increase are related to the electrolyte liquid content of the absorptive material around the unprotected electrode part, and the absorptive material and the unprotected electrode part
  • the contact tightness is positively related. The higher the electrolyte liquid content and the closer the contact, the faster the increase speed and the larger the amplitude.
  • the electric double layer capacitance if it is monitored that the electric double layer capacitance has undergone a significant change from small to large, and then from large to small, it indicates that the disposable absorbent article is in a good absorption state; if it is monitored that the electric double layer capacitance has occurred An obvious change from small to large, and then an insignificant change from large to small, indicates that the disposable absorbent article has entered a state of close to saturation from a good absorption state; if it is detected that the electric double layer capacitance has a significant From small to large, and then remain unchanged or continue to increase, it indicates that the disposable absorbent article has entered a saturated reverse osmosis state or a low-fluidity fecal infiltration state from a good absorption state.
  • the waterproof protection mechanism includes an upper waterproof film and a lower waterproof film.
  • the upper and lower waterproof films form an effective protective interlayer through a composite process.
  • the first and second detection electrodes are partially arranged with protected electrodes. Inside the interlayer, and at least one of the first and second detection electrodes is located at the edge of the interlayer and exposed to the outside through the interlayer edge gap and constitutes the unprotected electrode part;
  • the lower waterproof membrane interlayer and the interlayer edge gap together constitute the infiltration and diffusion control mechanism.
  • the electrolyte liquid contained in the excrement will pass through the interlayer edge gap in The interlayer penetrates, thereby generating a phenomenon of infiltration and diffusion and causing the capacitance value of the electric double layer capacitor to increase.
  • the penetration rate of the electrolyte liquid in the interlayer through the gap between the edges of the interlayer and the range of infiltration and diffusion are related to the bonding strength of the upper and lower waterproof films when the upper and lower waterproof films are combined.
  • the penetration rate of the electrolyte liquid in the interlayer through the interlayer edge gap and the range of infiltration and diffusion are related to the hydrophobicity of the adhesive used during compounding. The better the hydrophobicity, the slower the penetration rate and the greater the range of infiltration and diffusion. Small; or
  • the penetration rate of the electrolyte liquid in the interlayer through the interlayer edge gap and the range of infiltration and diffusion are related to the water resistance of the materials of the first and second detection electrodes. The better the water resistance, the higher the penetration rate of the electrolyte liquid. The slower, the smaller the range of infiltration and spreading.
  • the second detection circuit includes an electrolytic capacitor detection circuit
  • the electrolytic capacitor detection circuit includes at least one third circuit that has no contact with the excrement and is not affected by the infiltration and diffusion control mechanism.
  • a detection electrode, the third detection electrode includes a non-contact electrode, and the electrolytic capacitance value output by the second detection circuit is positively correlated with the wet area on the outer surface of the upper and lower waterproof membranes corresponding to the third detection electrode;
  • the third detection electrode has better water resistance and stability, the electrolytic capacitance value it produces has a relatively low correlation with the electrolyte liquid content of the surrounding absorbent material, and the electrolytic capacitance value will not be affected by the absorption.
  • the electrolyte liquid content of the sexual material is reduced and significantly reduced, and will not be significantly increased by long-term soaking of excrement.
  • the difference in the output characteristics of the first and second detection circuits is the absorption of the disposable absorbent article Condition monitoring and excrement distinction provide a basis for discrimination.
  • the capacitance of the first detection loop increases and the magnitude of the fall is greater than the fall magnitude of the second detection loop, it is determined that the excrement is urine; if the first detection loop The capacitance of the circuit does not fall after increasing, or the fall is less than the fall of the second detection circuit, it is determined that the excrement is low-fluidity excrement, the low-fluidity excrement includes loose stool, or the Disposable absorbent articles are already in a saturated reverse osmosis state.
  • the third detection electrode and any one of the first and second detection electrodes constitute the second detection circuit, and the second detection circuit and the electrolyte liquid contained in the excrement together constitute an electrolysis A capacitor, the third detection electrode constitutes a solid electrode of the electrolytic capacitor, the electrolytic liquid constitutes a liquid electrode of the electrolytic capacitor, the upper and lower waterproof films constitute the dielectric of the electrolytic capacitor, and the electrolytic capacitor
  • the capacitance value is positively correlated with the area of the liquid electrode corresponding to the solid electrode on the surface of the upper and lower waterproof membranes.
  • the first, second, and third detection electrodes are all located in an interlayer composed of the upper and lower waterproof membranes, and the first and second detection electrodes are located on both sides of the interlayer and each has a part thereof
  • the slits at the edges of the interlayer are exposed to the outside and constitute the unprotected electrode part
  • the third detection electrode is located between the first and second detection electrodes and constitutes a fully protected area that does not come in contact with any excrement
  • the area of the protected electrode portion of the first and second detection electrodes is much larger than the area of the unprotected electrode portion.
  • the third detection electrode also includes a third waterproof membrane and two upper and lower interlayers.
  • the first and second detection electrodes and the third detection electrode are respectively arranged in different interlayers.
  • the orthographic projection with the third detection electrode includes an overlap portion, which provides an initial capacitance value for the second detection loop, and compares the capacitance value of the second detection loop at a specific moment with the By comparing the initial capacitance value, the wet state at the specific moment can be known.
  • the upper and lower waterproof films include hard plastic films or waterproof coatings generated by coating of waterproof materials
  • the hard plastic films include BOPP films or PET films
  • the waterproof coatings include PVDC coatings
  • the detection electrode includes a carbon electrode produced by printing with carbon conductive ink
  • the width of the detection electrode includes 1 to 30 mm
  • the thickness of the waterproof film includes 1 to 100 microns
  • the thickness of the conductive ink printing includes 1 to 25 Micrometers
  • the area of the unprotected electrode part is less than one percent of the area of the protected electrode part
  • the absorption state monitoring sensor is consistent in the length direction
  • the cross section at any length is equal. Cutting it off in length will not affect its integrity and performance.
  • the present invention also provides a method for monitoring the absorption status of disposable absorbent articles and distinguishing urine and feces based on the absorption status monitoring sensor, which includes the following steps:
  • the capacitance values of the first and second detection loops are respectively acquired by the detection device as initial values;
  • the capacitance value of the first detection loop does not attenuate, or although the attenuation occurs, but the reduction is less than the capacitance reduction of the second detection loop, then it is determined that the excrement is loose stool, or the disposable The absorbent article is in a saturated reverse osmosis state.
  • the absorption state monitoring sensor is arranged on the surface layer of the disposable absorbent article, or between the surface layer and the absorption layer, the detection device includes a capacitance detection device, and the capacitance detection device includes at least three signal inputs The first, second, and third detection electrodes are electrically connected to the first, second, and third detection electrodes.
  • the detection device also includes a wireless transmitting device, which can compare the detected capacitance values from the first and second detection circuits, or with The related excrement existence information or absorption status information is sent out wirelessly.
  • the present invention also provides a manufacturing method related to the absorption state monitoring sensor, which includes the following steps:
  • the wide-width absorption state monitoring sensor roll material is slit in M+1 way, the slitting line is set in the middle position of the odd detection electrode and the corresponding detection electrode is cut together with its corresponding waterproof film to produce an M roll narrow
  • each roll of the narrow web absorption state monitoring sensor web material includes three detection electrodes, wherein the first and second detection electrodes are located on both sides of the narrow web absorption state monitoring sensor roll material and pass through the slitting line The generated slit is exposed to the outside, and the third detection electrode located in the middle of the narrow-width absorption state monitoring sensor roll material has no intersection with the slitting line and has no exposed part.
  • it also includes the step of cutting the narrow-width absorption state monitoring sensor roll material as required for the production of disposable intelligent absorbent articles to generate an absorption state monitoring sensor with a suitable length.
  • the present invention also provides a manufacturing method of a disposable intelligent absorbent article that can provide information on the existence and absorption status of excrement, including the following steps:
  • a narrow absorption state monitoring sensor roll is installed on the production line equipment of disposable absorbent articles, and the narrow absorption state monitoring sensor roll is set on the surface of the disposable absorbent article during the production process of the disposable absorbent article Layer, or between the surface layer and the absorption layer, or between the absorption layer and the leak-proof layer, and then cut the narrow-width absorption state monitoring sensor coil together with the surface layer, the absorption layer and the leak-proof layer to produce
  • One item includes absorption state monitoring sensors and disposable intelligent absorbent products that can provide information on the existence and absorption state of excrement.
  • the beneficial effect of the present invention is firstly that the detection electrode of the first detection circuit is divided into a protected electrode part and an unprotected electrode part, and the capacitance value generated by the unprotected electrode part is related to the electrolyte liquid content of the surrounding absorbent material.
  • the capacitance curve of the first detection loop which is easily affected by the electrolyte liquid content and contact tightness of the absorbent material
  • the capacitance curve of the second detection loop which is not easily affected by the electrolyte liquid content and contact tightness of the absorbent material.
  • the comparison method is used to realize the function of urine and feces distinction.
  • Another beneficial effect of the present invention is that the production of the absorption state monitoring sensor of the embodiment of the present invention is realized through traditional diaper production processes such as printing, compounding, and slitting, and the production of smart diapers is realized by arranging the absorption state monitoring sensor in the diaper.
  • diaper production processes such as printing, compounding, and slitting
  • smart diapers is realized by arranging the absorption state monitoring sensor in the diaper.
  • the standard production processes of diapers which are simple, convenient and fast production methods.
  • the absorption state monitoring sensor is consistent in the length direction and the cross section is equal. It can be cut and used according to the required length of each diaper without affecting its working performance, and has the ability to adapt to length.
  • Fig. 1 is a schematic diagram of a sensor for monitoring the absorption state of a disposable absorbent article and its application according to an embodiment of the present invention.
  • Fig. 2 is a schematic diagram of a layered structure of a sensor according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a side structure of a sensor according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of the A-A' cross-sectional structure and an equivalent circuit diagram of the sensor according to the embodiment of the present invention.
  • FIG. 5 is a schematic diagram of the detection electrode of the sensor of the embodiment of the present invention being penetrated and infiltrated by the electrolyte liquid.
  • FIG. 6 is a schematic diagram of a cross-sectional structure and an equivalent circuit diagram of the sensor according to an embodiment of the present invention when the sensor is disposed between the surface layer and the absorbent layer of the diaper.
  • FIG. 7 is a schematic diagram of a cross-sectional structure and an equivalent circuit diagram of a sensor including a third detection electrode according to an embodiment of the present invention.
  • FIG. 8 is a schematic cross-sectional structure diagram and an equivalent circuit diagram of the first, second and third detection electrodes of the sensor according to the embodiment of the present invention in two different interlayers and including overlapping projections.
  • Fig. 9 is a schematic diagram of the sensor according to the embodiment of the present invention being cut during the production process.
  • Fig. 10 is a flowchart of a method for manufacturing a sensor according to an embodiment of the present invention.
  • Fig. 11 is a flow chart of a manufacturing method of a disposable intelligent absorbent article capable of providing information on the presence and absorption status of excrement according to an embodiment of the present invention.
  • Fig. 12 is a flowchart of a method for realizing absorption state monitoring and urine and feces distinction on disposable absorbent articles according to an embodiment of the present invention.
  • Fig. 13 is a graph of capacitance output changes of the first and second detection loops in the state of urinary excrement according to an embodiment of the present invention.
  • Fig. 14 is a graph showing changes in capacitance output of the first and second detection circuits of the embodiment of the present invention in the state of fecal excrement.
  • 15 is a block diagram of the functional structure of the absorption state monitoring sensor, related products, and related systems according to an embodiment of the present invention.
  • Fig. 1 is a schematic diagram of a sensor for monitoring the absorption state of a disposable absorbent article and its application according to an embodiment of the present invention.
  • 10 in the figure is disposable absorbent products (absorbent products for short), including diapers, diapers, toddler pants, pull-up pants, changing pads, sanitary napkins, maternity towels and other products.
  • These products usually include a surface layer (dry layer, Including hydrophilic non-woven fabric), leak-proof layer (base film, including breathable or non-breathable polyethylene film PE), absorbent layer (moisture absorption layer, located between the surface layer and the leak-proof layer, usually including polymer absorbent material/
  • a surface layer dry layer, Including hydrophilic non-woven fabric
  • base film including breathable or non-breathable polyethylene film PE
  • absorbent layer moisture absorption layer, located between the surface layer and the leak-proof layer, usually including polymer absorbent material/
  • the main parts of polymer water-absorbing resin/SAP, wood pulp, fluff pulp or fluffy non-woven fabrics, etc. for the convenience of description, the following mainly uses diapers as an example for explanation, and the relevant instructions are also applicable to other disposable absorbent products.
  • the diaper 10 includes an absorption state monitoring sensor 20 arranged in the diaper.
  • the absorption state monitoring sensor may be referred to as a sensor for short.
  • the sensor 20 is usually a flat and flexible strip/belt/film-like structure. Therefore, the sensor in the embodiment of the present invention is sometimes called a sensing film or a sensing strip, which includes two first detection electrodes 21 and a first detection electrode 21 parallel to each other.
  • Two detection electrodes 22, the combination of the first and second detection electrodes (ie electrode group) is represented by 23, which constitute the first detection circuit of the embodiment of the present invention, usually conductive ink (including carbon conductive ink, carbon paddle, etc.) ) Is printed on a waterproof film, so the detection electrode can also be called a conductive ink line.
  • the figure also includes a detection device 30 which is integrated with the detection electrode 23 through an electrical connection 24.
  • a detection device 30 which is integrated with the detection electrode 23 through an electrical connection 24.
  • both the diaper 10 and the sensor 20 are disposable/disposable, while the detection device 30 is reusable. Since the diaper is equipped with the sensor of the embodiment of the present invention to detect and distinguish between urine and urine, the embodiment of the present invention refers to this type of diaper as a smart diaper, and the corresponding disposable absorbent is called a disposable intelligent absorbent.
  • Fig. 2 is a schematic diagram of a layered structure of a sensor according to an embodiment of the present invention.
  • a sensor including a lower waterproof film 25, an upper waterproof film 26, and a first detection electrode 21 and a second detection electrode 22 printed/set on the inner surface of the lower waterproof film.
  • the two electrodes are collectively called an electrode group (or electrode group). Yes) 23 and constitute the first detection loop of the embodiment of the present invention.
  • the detection electrode group 23 can also be printed on the inner surface of the upper waterproof film.
  • the various components of the sensor in the figure are drawn in a layered manner.
  • the above-mentioned components are bonded together through an adhesive compounding process, and the parts can also be thermally fused together through processes such as hot pressing.
  • the inner surface refers to the side constituting the interlayer of the composite film.
  • the first and second detection electrodes are covered by the upper and lower waterproof membranes.
  • the first is to reduce the proportion of the detection electrodes exposed to the excrement, thereby reducing the generation during the detection process.
  • Electric double layer capacitors are also called “super capacitors", and their capacity is generally very large. A large capacitance value will greatly increase the time constant of the detection loop and affect the detection speed. Therefore, reducing it will help improve the detection speed.
  • the second function is to constitute the infiltration and diffusion control mechanism required by the first detection circuit of the embodiment of the present invention, which will be further described below.
  • one layer of waterproof film can be used as BOPP (biaxially oriented polypropylene) film or PET (polyester) film and other rigid plastic films, so that it has enough strength and is suitable for printing on it; another The layer of waterproof film can be BOPP or PET film, or a softer film, such as PE (polyethylene) or EVA (ethylene-vinyl acetate copolymer), or a waterproof coating can be formed from waterproof materials by coating or other methods, such as PVDC coating and so on.
  • the width of the detection electrode includes 1 to 30 mm, and the thickness of the waterproof film includes 1 to 100 microns.
  • FIG. 3 is a schematic diagram of a side structure of a sensor according to an embodiment of the present invention.
  • 20 is a sensor
  • 25 is a lower waterproof film
  • 26 is an upper waterproof film
  • 23 is a detection electrode group viewed from the side, which is in the shape of a line.
  • 23c represents the exposed part of the electrode group 23 at the edge gap between the upper and lower waterproof membrane interlayers, which overlaps with 23 visually. Since 23c is the part of the detection electrode that is exposed to the outside and can be in contact with excrement, the embodiment of the present invention refers to this part as the unprotected electrode part, and the part that is not exposed to the outside is collectively called the protected electrode part.
  • 23c is the detection electrode exposed to the outside through the edge of the interlayer, its width is equal to the thickness of the conductive ink printed on the waterproof film by the conductive ink, which is generally between 1 and 25 microns.
  • the area of the unprotected electrode part in the embodiment of the present invention is much smaller than that of the protected electrode part. Assuming that the width of the electrodes 21 and 22 is 5 mm and the thickness of the conductive ink is 5 microns, then the embodiment of the present invention is not protected by the electrode.
  • the area of the part (in this embodiment refers to the surface area of the detection electrode exposed to the edge of the interlayer, that is, the thickness of the conductive ink times the length of the conductive ink) is the area of the protected electrode part (the width of the detection electrode times the length of the detection electrode) ), which can increase the detection speed of the first detection loop by a thousand times (compared to the bare detection electrode).
  • the area of the unprotected electrode portion is generally less than one percent of the area of the protected electrode portion.
  • Figure 4 is a schematic diagram of the AA' cross-sectional structure and equivalent circuit diagram of the sensor of the embodiment of the present invention.
  • 26 is the upper waterproof film
  • 25 is the lower waterproof film
  • 21 and 22 are covered by the upper and lower waterproof films.
  • the protected first and second detection electrodes 21, 22 each have one side located at the edge of the sensor interlayer, and can be exposed to the outside through the gap 21c, 22c at the edge of the interlayer.
  • the interlayer edge gaps 21c, 22c are usually produced by slitting, that is, the detection electrodes 21, 22 and the upper and lower waterproof films are cut together with a slitting knife. Therefore, 21c, 22c can also be used to represent slitting lines, or slitting lines.
  • the electrode width of the exposed part is equal to the width of the interlayer gap/printing thickness of the conductive ink, and the exposed part is not protected.
  • the electrode part can be in direct contact with the excrement 16, 18 and can be infiltrated by the electrolyte liquid contained in the excrement.
  • an electric double-layer capacitor will be generated on the liquid/solid surface.
  • the size of the capacitor is positively related to the area/surface area of the electrode wetted by the electrolyte liquid.
  • the capacitance can be detected from The two ends of the electrodes 21 and 22 are detected, which is represented by the capacitor C1 in the figure.
  • C1 in this embodiment is equivalent to the output value of the first detection loop in the embodiment of the present invention.
  • FIG. 5 is a schematic diagram of the detection electrode of the sensor of the embodiment of the present invention being penetrated and infiltrated by the electrolyte liquid.
  • 21, 22 are the first and second detection electrodes, the main part of which is protected by the upper/lower waterproof film 26/25, constituting the protected electrode part;
  • 21c, 22c are the cutting lines/cuts on both sides of the sensor, the electrodes 21, 22 is exposed to the outside through the cuts 21c, 22c to form an unprotected electrode part, which can directly contact the excrement 16/18. Since the interlayer of the embodiment of the present invention is composed of upper and lower waterproof films through adhesives, its water resistance is limited.
  • the electrolyte liquid in the excrement When it is immersed in excrement (or the absorbent material around the incision has a higher electrolyte liquid content) When the time), the electrolyte liquid in the excrement will gradually penetrate from the incision to the depth of the interlayer and make more parts of the detection electrodes 21 and 22 be infiltrated by the electrolyte liquid, as shown by the dashed lines 21i and 22i in the figure, and the dashed line 21i 22i is arc-shaped, and the recessed middle part means the electrolyte liquid penetrates into the protected electrode part, so that the area of the protected electrode part of the detection electrode is less and the area of the unprotected electrode part is gradually increased, so that the first and second The electric double layer capacitance output between the detection electrodes gradually increases.
  • the detection electrode of the embodiment of the present invention includes a carbon electrode printed with carbon conductive ink.
  • the carbon electrode is a porous material with many water-absorbing micro-spaces. The internal surface area of these micro-spaces is much larger than the surface area of the detection electrode on the incision. ,
  • the electrolyte liquid easily penetrates and fills these spaces to increase the liquid/solid contact area, that is, the surface area of the electrolyte liquid infiltrating the carbon electrode increases, thereby increasing the capacitance.
  • the penetration of electrolyte liquid is also related to the bonding strength of the upper and lower waterproof membranes, the hydrophilicity and hydrophobicity of the adhesive, and the water resistance of the conductive ink. The stronger the bonding strength, the hydrophobicity of the adhesive and the water resistance of the conductive ink. The better, the slower the penetration rate of the electrolyte liquid, and the smaller the range of the corresponding infiltration and diffusion.
  • the embodiment of the present invention covers and protects the detection electrode through upper and lower waterproof films. From this perspective, it can be considered that the embodiment of the present invention includes a waterproof protection mechanism, or that the waterproof protection mechanism includes upper and lower waterproof films 26, 25; The electrolyte liquid of the embodiment of the present invention penetrates into the protected electrode part through the interlayer edge slits/cuts 21c, 22c.
  • the embodiment of the present invention includes the infiltration and diffusion control mechanism, or that the infiltration and diffusion control mechanism includes the above ,
  • FIG. 6 is a cross-sectional structure diagram and equivalent circuit diagram of the sensor according to an embodiment of the present invention when the sensor is arranged between the surface layer 11 and the absorbent layer 12 of the diaper.
  • the sensor can also be arranged on the surface layer of the diaper, or the diaper Between the absorption layer and the leak-proof layer.
  • 20 in the figure is a sensor, including an upper waterproof film 26, a lower waterproof film 25, and a first detection electrode 21 and a second detection electrode 22 located in the upper and lower waterproof film sandwiches, and the electrodes 21 and 22 pass through the edges of the sandwich in the sandwich The unprotected electrode portions 21c and 22c exposed outside the slit/cut.
  • urine 16 When urination occurs (such as urination), urine 16 will first infiltrate the surface layer 11 of the diaper, and then flow into the absorbent layer 12 of the diaper from the left and right sides of the sensor 20 to form an infiltration area 18. During this process, the urine will flow into the absorbent layer 12 of the diaper.
  • the liquid 16 will be in contact with the cutouts 21c and 22c on both sides of the sensor 20, thereby generating an electric double layer capacitor C1 between the first and second detection electrodes 21 and 22.
  • the electric double layer capacitor is generated at the interface between the electrode and the liquid.
  • the positive and negative ions on the interface constitute the electric double layer.
  • the electric double layer The capacitance is highly dependent on the tightness of the contact between the excrement and the detection electrode.
  • the diapers When urine is absorbed by the absorbent layer 12, especially after being absorbed and locked by the polymer absorbent material SAP in the absorbent layer, the diapers will gradually return to dryness (that is, the degree of moisture is reduced), and the electrolyte liquid near the incisions 21c and 22c Will gradually decrease (that is, the electrolyte liquid content in the absorbent material around the sensor is reduced.
  • the electrolyte liquid content in the absorbent material around the sensor refers to the electrolyte liquid content per unit volume, especially It refers to the electrolyte liquid content per unit volume of the absorbent material in contact with the first and second detection electrodes in the incision), which makes the capacitance C1 fall from the peak value and gradually decrease, showing an attenuation characteristic.
  • the absorptive materials around the sensor include some hydrophilic materials contained in the surface layer 11, the absorbing layer 12 and close to the sensor 20, especially close to the incisions 21c, 22c (that is, the unprotected electrode part), such as non-woven fabrics, coverings Cloth, white paper, wood pulp, etc.
  • the diaper When the diaper is not urine but loose stools, the situation will change. Due to the poor fluidity of loose stools (low-fluidity excrement) and strong adhesion, the loose stools will adhere to the incisions 21c/22c on both sides of the sensor and have a continuous effect. In other words, it is equivalent to maintaining an almost constant state/degree of humidity. At the same time, the electrolyte liquid contained in the loose stool adhering to the incision 21c/22c will gradually penetrate from the incision 21c/22c to the depth of the interlayer, so that part of the electrode that was originally protected is also infiltrated by the electrolyte liquid.
  • the increase in the surface area of the electrolyte liquid infiltration and the corresponding increase in the electric double layer capacitance means that the infiltration and diffusion control mechanism of the embodiment of the present invention is working.
  • the sensor can also be pasted on the surface layer 11 of the diaper, so that the excrement can be in contact with the sensor without obstacles.
  • the absorption performance of the absorbent layer of diapers will reduce the capacitance of the electric double layer between the two detection electrodes, and the penetration and diffusion of the electrolyte liquid of the excrement in the interlayer of the waterproof film will increase the capacitance of the electric double layer.
  • the capacitance attenuation effect caused by the decrease of the electrolyte liquid content of the absorbent material around the sensor will be greater than the capacitance increase effect caused by the infiltration and diffusion of the electrolyte liquid in the interlayer, so that the capacitor C1 will appear after urination. Decay over time, and the faster the capacitance decays, the better the absorption capacity of the diaper; on the contrary, when the excrement is loose stool, the capacitance increase effect caused by the infiltration and diffusion of the electrolyte liquid in the interlayer will be greater than the decrease in the electrolyte liquid content of the absorbent material The resulting capacitance attenuation effect makes the capacitor C1 appear to increase with time as a whole. Through the analysis of the trend of the capacitor C1, it can effectively distinguish between urine and feces.
  • FIG. 7 is a schematic diagram of a cross-sectional structure and an equivalent circuit diagram when the sensor according to an embodiment of the present invention includes a third detection electrode, which is an extension of the embodiment shown in FIG. 6.
  • 20 is a sensor, which is arranged between the surface layer 11 and the absorbent layer 12 of the diaper, and includes an upper waterproof film 26, a lower waterproof film 25, and a first detection electrode 21 and a second detection electrode located in the upper and lower waterproof film sandwiches.
  • this embodiment includes a third detection electrode 27, which is arranged between the first and second detection electrodes 21, 22, which is completely covered and protected by the upper and lower waterproof membranes 26, 25, so in It does not come into contact with excrement 16, 18 during the working process, thus forming a non-contact electrode.
  • the first and second detection electrodes constitute the first detection circuit of the present invention
  • the third detection electrode and either of the first and second detection electrodes (21 or 22) constitute the second detection circuit
  • the first and second detection circuits have different performances for excreta with different fluidity.
  • urine 16 When there is excrement (such as urine), urine 16 will first infiltrate the surface layer 11 of the diaper, and then flow into the diaper absorbent layer 12 from both sides of the sensor 20 to form an infiltration area 18. In the above process, the urine will contact 21c and 22c and present an electric double layer capacitance C1 between 21 and 22 (output from the first detection loop). Since urine containing salt (electrolyte) is conductive and is an electrolyte liquid, urine/electrolyte liquid 16/18 and 21c/22c will act as a liquid electrode when in contact with it, becoming an extension of detection electrodes 21 and 22 .
  • salt electrolyte
  • the electrolytic capacitor C13 (output between 21 and 27) and C23 (between 22 and 27 together with the electrode 27).
  • Output where the electrode 27 constitutes the solid electrode of the electrolytic capacitor, the excrement 16, 18 constitutes the electrolyte/liquid electrode of the electrolytic capacitor, and the upper and lower waterproof films 26, 25 constitute the dielectric of the electrolytic capacitor.
  • the electrolytic capacitance value of C13 and C23 is the same as The excrement on the upper and lower surfaces of the waterproof membrane is positively correlated with the area corresponding to the third detection electrode 27.
  • the urine coverage on the upper and lower surfaces of the electrode 27 can be obtained, which can realize the quantitative wetness detection function, that is, not only know whether the wetness has occurred, but also the degree of wetness how is it.
  • the third detection electrode 27 Since the third detection electrode 27 is located in the interlayer, it is protected by the upper and lower waterproof membranes and does not come into contact with excrement at all, so its water resistance and stability are much better than the first and second detection electrodes 21, 22. It will not be corroded by excrement so as to increase the capacitance value. Therefore, the excrement that accumulates on the upper and lower waterproof membranes and corresponds to the electrode 27, whether it is urine with high fluidity or loose stool with low fluidity, the output The electrolytic capacitor value will be relatively stable.
  • the electrolytic capacitors C13 and C23 are formed through a waterproof film.
  • the thickness of the waterproof film is generally between 10 and 100 microns, which is larger than the interval (1 nanometer) between the two charge layers of the electric double layer capacitor.
  • the electrolytic capacitor has a relatively low dependence on the contact tightness of excrement.
  • the loss of electrolyte liquid on the absorbent material around the sensor/decreased electrolyte liquid content per unit volume has a smaller impact on the electrolytic capacitor than the electric double layer capacitor. some.
  • the first and second detection electrodes of the embodiment of the present invention directly contact the excrement through the slitting line/incision to form the first detection circuit (electric double layer capacitance detection circuit, output C1), and the third
  • the detection electrode (non-contact electrode) and any one of the first and second detection electrodes constitute a second detection circuit (electrolytic capacitance detection circuit, output C13, C23), in which the electric double layer capacitance detection circuit has a tight contact with excrement
  • the requirements are high, and the capacitance value is reduced due to the loss of the electrolyte liquid of the absorptive material around the detection electrode, and the water resistance of the electric double layer capacitance detection circuit is poor, and it is easily affected by the penetration of the electrolyte liquid in the excrement.
  • the electrolytic capacitor detection circuit has relatively low requirements for the contact tightness of the excrement, and it is not easy to be affected by the loss of the electrolyte liquid of the absorptive material around the electrode to reduce the capacitance value, and the electrolytic capacitor detection circuit has better water resistance, even if it is Soaking the excrement for a long time will not increase its capacitance value.
  • FIG. 8 is a schematic cross-sectional structure diagram and an equivalent circuit diagram of the first, second and third detection electrodes of the sensor according to the embodiment of the present invention in two different interlayers and including overlapping projections.
  • 26 and 25 are the upper and lower waterproof films
  • 29 is the third waterproof film (middle film), which forms an upper interlayer and a lower interlayer with the upper and lower waterproof films.
  • the first and second detection electrodes 21, 22 are located
  • the upper sandwich layer is composed of 26 and 29, and the third detection electrode 27 is located on the lower sandwich layer composed of 29 and 25, and the third detection electrode 27 and the first and second detection electrodes 21, 22 are in the orthographic projection direction (up and down in the figure).
  • the overlap portion causes the first and third detection electrodes and the second and third detection electrodes to generate an initial capacitance value C 0 respectively even when they are dry, which represents the dry state of the diaper.
  • the first detection circuit When the diaper is wet, the first detection circuit generates an electric double layer capacitor C1 and outputs it through the first and second detection electrodes 21, 22, while the second detection circuit generates an electrolytic capacitor C2, which is present on the detection electrode 27 and excrement 16/ Among the electrolyte liquid electrodes composed of 18, as long as the size of C2 and C 0 is compared, the wet state of the diaper can be known . The more C2 and the larger C 0, the more severe the wetness.
  • Fig. 9 is a schematic diagram of the sensor according to the embodiment of the present invention being cut during the production process.
  • multiple sets of detection electrodes are usually printed on a large roll of several kilometers long wide waterproof film at the same time, and then the waterproof film printed with multiple sets of detection electrodes is printed with another width.
  • the waterproof membrane is laminated to make it a roll of wide-width composite membrane, so that multiple sets of detection electrodes are covered and protected by the upper and lower wide-width waterproof membranes.
  • the above-mentioned wide composite film containing multiple sets of detection electrodes must be slit, and a part of the detection electrode must be exposed through the slit edge gap through slitting. To form an unprotected electrode part.
  • 20N is a part of a composite membrane that includes multiple sets of detection electrodes (the actual length is much longer than shown in the figure).
  • the picture includes three sets of detection electrodes 20_1, 20_2, and 20_3, and each set of detection electrodes can constitute One sensor, so 20_1, 20_2, and 20_3 can also be used to represent three sensors respectively.
  • a wide composite membrane can contain dozens or even hundreds of detection electrodes. Assuming that the composite film has a length of 3000 meters and a width of 1 meter, and the actual sensor width is 2 cm, then a roll of wide composite film can be divided into 50 rolls of narrow sensor rolls with a length of 3000 meters (that is, a roll Method of packaging film materials).
  • narrow-width sensor rolls will become a raw material for the production of smart diapers.
  • only the narrow-width sensor rolls can be cut and set on a specific layer of the diaper, or the sensor can be set on a specific layer of the diaper and then combined with the diaper. Cut off the other constituent materials together to produce a smart diaper product containing a sensor.
  • Each narrow sensor in the figure includes three detection electrodes, namely the first, second, and third detection electrodes 21, 22, and 27.
  • 20c is the slitting line. After slitting is performed at 20c, the first and second detection electrodes 21/22 that were originally connected together can be cut. After slitting, the first and second detection electrodes 21, 22 on both sides of the sensor can be exposed to the outside through the slit formed by the slitting line 20c and constitute the unprotected electrode part of the embodiment of the present invention.
  • the third detection electrode 27 it will be located between the first and second detection electrodes 21 and 22 after slitting.
  • the slitting line 20c is arranged at the middle position of the odd-numbered (1, 3, 5, 7...) detection electrode from top to bottom.
  • the narrow sensor web will be cut at 20e according to the required length (usually the same as the length of the diaper) during the production of smart diapers. Although there will be an incision on the cut line 20e, because it is located in the non-working area of the sensor (corresponding to the head and tail positions of the urine, that is, the position of the front abdomen and the back waist), it does not correspond to the excrement in the diaper during work. Therefore, it does not affect the normal operation of the sensor, and does not constitute the part of the electrode that is not protected by the embodiment of the present invention.
  • the composite film 20N in the figure can be used to make 3 sensors, and the excess parts above and below the sensors 20_1 and 20_3 will be treated as waste. To produce more sensors at a time, it is necessary to use a wider waterproof film and print more sets of detection electrodes on the waterproof film.
  • Step S1001 is to set 2*M+1 parallel detection electrodes on a wide waterproof film roll by printing, where M is an integer not less than 1;
  • Step S1002 is to combine another wide-width waterproof membrane coil with a wide-width waterproof membrane coil provided with a detection electrode to generate a wide-width sensor coil, and the detection electrode is located in the composite film sandwich of the wide-width sensor coil. ;
  • Step S1003 is to slit the wide sensor coil in M+1 way, the slitting line is set at the middle position of the singular detecting electrode and the corresponding detecting electrode is cut together with its corresponding waterproof film to generate an M-roll narrow sensor Coil, each roll of narrow-width sensor coil includes three detection electrodes, of which the first and second detection electrodes are located on both sides of the narrow-width sensor coil and are exposed through the slit of the slitting line, and are located in the middle of the narrow-width sensor coil.
  • the third detection electrode in the position has no intersection with the slitting line and has no exposed part.
  • Step S1004 is to cut the narrow-width absorption state monitoring sensor roll material according to the production needs of the disposable intelligent absorbent article to generate an absorption state monitoring sensor with a suitable length.
  • this is a flow chart of a manufacturing method of a disposable intelligent absorbent article capable of providing information on the presence and absorption status of excrement according to an embodiment of the present invention, including the following steps:
  • Step S1101 is to install a narrow-width sensor roll material on the production line equipment of disposable absorbent articles, and cut the narrow-width sensor web material according to the required length during the production process of disposable absorbent articles to obtain a sensor with a moderate length. Then set the sensor on the surface layer of the disposable absorbent article, or between the surface layer and the absorbent layer, or between the absorbent layer and the leak-proof layer, and then cut the disposable absorbent article to produce a strip that includes the sensor and can provide excrement Disposable intelligent absorbent articles with status information and absorption status information, the sensor is shorter than or equal to the absorbent article in length, or
  • Fig. 12 is a flow chart of a method for monitoring the absorption state and distinguishing urine and feces on a disposable absorbent article according to an embodiment of the present invention, including the following steps:
  • Step S1201 is to electrically connect a detection device to the first detection circuit and the second detection circuit of the sensor set on the disposable absorbent article;
  • step S1202 when the disposable absorbent article is dry, the capacitance values of the first and second detection circuits are separately obtained by the detection device as the initial value;
  • Step S1203 is to monitor the change of the capacitance value of the first and second detection loops
  • Step S1204 is that if any output capacitance value of the first and second detection loops has a continuous increase compared with the initial value, it is determined that the disposable absorbent article has excrement and the humidity range is increasing;
  • Step S1205 is to continuously monitor the change of the capacitance value of the first and second detection loops. If the capacitance value of any loop drops or no longer increases after a certain peak value, it is determined that the moisture range increase process in the disposable absorbent article has been completed. Stop;
  • Step S1206 is to compare the capacitance value changes of the first and second detection loops in a specific time period after the peak value appears;
  • Step S1207 If the capacitance value of the first detection loop is attenuated and the attenuation amplitude is greater than that of the second detection loop, it is determined that the excrement is urine, and the greater the decrease, the better the absorption state of the disposable absorbent article;
  • step S1208 if the capacitance value of the first detection circuit does not attenuate or the attenuation amplitude is smaller than that of the second detection circuit, it is determined that the excrement is loose stool, or the disposable absorbent article is in a saturated reverse osmosis state.
  • the above-mentioned capacitance value is a broad concept.
  • the detection device may not directly output a capacitance value, but may also be a voltage value or other parameter value related to the capacitance value. As long as the information related to the capacitance value can be obtained or calculated from these parameters That's it.
  • Fig. 13 is a graph of capacitance output changes of the first and second detection loops in the state of urinary excrement according to an embodiment of the present invention.
  • the abscissa is time t
  • the ordinate is capacitance c
  • c1 is the electric double layer capacitance value output by the first detection loop
  • c2 is the electrolytic capacitance value output by the second detection loop.
  • t t0
  • c1 and c2 are both 0, which means that the detection circuit/sensor/absorbent article is in a dry state.
  • the capacitances c1 and c2 continue to increase, which means that the absorbent article has excrement and the humidity range is increasing.
  • the c1 and c2 curves in the figure are the result of the combined effects of the relevant parameters of the first and second detection loops.
  • the process of c1 falling from the peak is mainly affected by factors such as the electrolyte liquid content of the absorbent material around the sensor, the degree of moisture and the degree of contact tightness.
  • the absorbent material such as wood pulp/fluff pulp, or fluffy cloth/non-woven fabric
  • the absorbent material (such as wood pulp/fluff pulp, or fluffy cloth/non-woven fabric) around the sensor contains
  • the electrolyte liquid content will gradually decrease, which makes c1 decrease; at the same time, c1 is affected by the penetration of the electrolyte liquid in the protected interlayer, which makes c1 increase.
  • the absorbent material around the sensor will quickly become dry, so that the rate of attenuation of c1 is faster than the growth rate as a whole, so that the overall attenuation of c1 is larger. situation.
  • the process of c2 falling from the peak is also affected by factors such as the degree of humidity and contact tightness, but the degree of influence is smaller than that of c1, so the attenuation amplitude of c2 is smaller than that of c1.
  • the response curve of c1 and c2 to excrement can be changed to a certain extent. If c1 and c2 are required to have a faster attenuation rate and a greater reduction, you can increase the polymer water-absorbing resin content in the absorbent layer 12 and reduce the wood pulp/fluff pulp content in the absorbent layer, because wood pulp/fluff pulp has Water retention capacity will keep moist for a long time.
  • One of the methods is to use a composite core/hybrid core.
  • the composite core is also called the third or third generation core, which is composed of dust-free paper, non-woven fabric (fluffy non-woven fabric) and polymer absorbent resin , And glue each layer of material together with hot melt adhesive.
  • the composite core does not contain wood pulp/fluff pulp.
  • the polymer water-absorbing resin absorbs and locks the moisture, the residual moisture in the absorbent layer will be less and it will appear more dry, which makes the moisture of the absorbent material around the sensor/ The electrolyte liquid content is greatly reduced, so that c1 and c2 quickly decay.
  • Fig. 14 is a graph showing changes in capacitance output of the first and second detection circuits of the embodiment of the present invention in the state of fecal excrement.
  • the abscissa is time t
  • the ordinate is capacitance c
  • c1 is the electric double layer capacitance value output by the first detection loop
  • c2 is the electrolytic capacitance value output by the second detection loop.
  • t t0
  • c1 and c2 are both 0, which means that the detection circuit/sensor/absorbent article is in a dry state.
  • the capacitances c1 and c2 continue to increase, which means that the absorbent article has excrement and the humidity range is increasing.
  • the curve c2 starts to stop growing, which means that the increasing process of the moisture range of the absorbent article has stopped, but at this time c1 does not fall back and still shows a gradual increase.
  • the curve in the figure is also the result of the comprehensive effect of the relevant parameters of the first and second detection loops.
  • the decrease of c2 is less than that in Figure 13 because the loose stools with low fluidity adhere to the sensor and keep it moist for a long time.
  • c1 because of the influence of the infiltration and expansion control mechanism, the electrolyte liquid in the thin stool penetrates into the interlayer and the protected electrode part is corroded (refer to Figure 5), so that the overall c1 continues to increase over time.
  • the difference between the curves is generated, which can effectively realize the detection and differentiation of urine and feces. In this case, even if a faster-drying composite core structure is used, c1 will not be attenuated, but will continue to increase over time, which makes it easier to distinguish whether the excrement that wets the diaper is stool or urination.
  • FIG. 15 is a block diagram of the functional structure of the absorption state monitoring sensor, related products, and related systems according to an embodiment of the present invention, and is a general description and summary of the foregoing embodiment.
  • 10 is a disposable absorbent article, which includes a surface layer 11, an absorbent layer 12 and a leak-proof layer 15.
  • an absorption state monitoring sensor 20 is provided in the absorbent article, which includes a first detection circuit 20a and a second detection circuit 20b.
  • the first detection loop includes a first detection electrode 21 and a second detection electrode 22, and the second detection loop includes a third detection electrode 27, which is formed with either of the first and second detection electrodes (21 or 22)
  • the output of the second detection loop, or in other words, the second detection loop actually includes any one of the first and second detection electrodes.
  • the detection device 30 is an external detection device, which includes three connection terminals/signal input terminals, which are respectively electrically connected to the first, second, and third detection electrodes, and the detection device 30 monitors the first and second detection circuits , And through the monitoring of the excrement status information and absorption status information of the absorbent article, and through the comparison and analysis of the capacitance change law of the first and second detection loops to realize the distinction between urine and feces.
  • the output of the first and second detection loops in the embodiment of the present invention are both capacitance values, so the detection device 30 includes a capacitance detection device.
  • the detection device also includes a wireless transmitting device, which can wirelessly send the detected capacitance value from the first and second detection loops, or the presence or absorption status information of excrement related thereto.
  • the first detection circuit 20a includes a waterproof protection mechanism 231.
  • the waterproof protection mechanism 231 includes the upper and lower waterproof films of the embodiment of the present invention, which implement waterproof protection for the first and second detection electrodes and constitute the protected electrode part 232 .
  • the first detection loop 20a also includes a cutout 233, which acts on the upper and lower waterproof membranes and the first and second detection electrodes, so that at least a part of the first and second detection electrodes are exposed through the cutout 233, which constitutes a The protected electrode part 235.
  • the excrement When there is excrement in the absorbent article, the excrement will increase the electrolyte liquid (such as urine, loose stool) of the absorbent material 236 around the unprotected electrode part, and the electrolyte liquid in the absorbent material will pass through the incision.
  • the first and second detection electrodes are not partly infiltrated by the protective electrode, so that an electric double layer capacitance is generated in the first detection circuit and output between the detection electrodes 21 and 22.
  • the capacitance of the electric double layer is related to the electrolyte liquid content of the absorbent material 236 around the unprotected electrode part 235, and the contact tightness between the absorbent material 236 and the unprotected electrode part.
  • the electrolyte liquid near the incision will also enter through the incision and penetrate into the interlayer composed of the upper and lower waterproof membranes, turning a part of the originally protected electrode into an unprotected electrode, thereby causing the electric double layer capacitance
  • the electrolyte liquid penetration rate and the range of infiltration and diffusion are related to the electrolyte liquid content and contact tightness of the absorbent material around the incision.
  • the electrolyte liquid content, contact tightness and the achieved diffusion range will eventually reach a dynamic equilibrium. For example, when the electrolyte liquid content of the absorbent material decreases/ becomes dry, the infiltration and diffusion range will not increase, or even shrink accordingly. narrow.
  • the penetration rate of the electrolyte liquid and the range of infiltration and diffusion are also related to the composite strength of the waterproof membrane, the hydrophilicity and hydrophobicity of the adhesive, and the water resistance of the electrode material.
  • the third detection electrode 27 in the second detection circuit 20b is protected by the corresponding waterproof protection mechanism 271 from any contact with excrement, which constitutes a non-contact electrode 272.
  • the waterproof protection mechanism 271 of the second detection loop can share the upper and lower waterproof membranes with the waterproof protection mechanism 231 of the first detection loop.
  • the second detection circuit will output an electrolytic capacitor.
  • the capacitance value is equal to that of the absorbent material 276 around the non-contact electrode 272.
  • the electrolyte liquid content is related to the tightness of contact. The higher the electrolyte liquid content and the tighter the contact, the greater the electrolytic capacitance.
  • the electric double layer capacitors and electrolytic capacitors output by the first and second detection loops have different correlations with the electrolyte liquid content and contact tightness of the absorptive material.
  • the electrolyte liquid content and contact tightness have a greater influence on the first detection circuit than on the second detection circuit, that is, the first detection circuit is more sensitive to the electrolyte liquid content and the tighter the contact.
  • the sensitivity of the second detection loop will be relatively low, especially the second detection loop will not have electrolyte liquid penetration and infiltration and diffusion.
  • the above-mentioned embodiment of the present invention uses the electric double layer capacitors generated by the unprotected electrode portions at the edges of the upper and lower waterproof membrane interlayers as an example to illustrate the first detection circuit, and uses the electrolysis generated by the non-contact electrodes in the waterproof membrane interlayer.
  • the capacitor is taken as an example to illustrate the second detection loop.
  • resistance, inductance or other impedance methods can also be used to implement the first and second detection loops, as long as the first and second detection loops exhibit different effects and output laws on excreta with different fluidity, and the The effect and output law are identifiable and distinguishable, which can realize the function of detecting the absorption state of the absorbent article and distinguishing urine and feces.
  • a waterproof protection mechanism and a wetting diffusion control mechanism In addition to the combination of upper and lower waterproof films to protect the protected electrode part, and then the unprotected electrode part is formed by slitting at its edge, which constitutes a waterproof protection mechanism and a wetting diffusion control mechanism, other types can also be used.
  • different water-resistant films can be selected to composite the detection electrode. Different water resistance represents different infiltration and diffusion capabilities.
  • a breathable film or a hydrophobic non-woven fabric can be used to composite the first 1.
  • the second detection electrode so that the first and second detection electrodes can be gradually penetrated by the electrolyte liquid, and gradually evolve from the part of the protected electrode to the part of the unprotected electrode.
  • coatings with relatively good water resistance can be used to cover the third detection electrode/non-contact electrode, and coatings with relatively poor water resistance can be used to cover the first and second detection electrodes, so that the first and second detection electrodes can be used over time. It is gradually eroded by water and infiltrated by water over time, which can constitute the waterproof protection mechanism and the infiltration and diffusion control mechanism of the embodiment of the present invention.

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  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Vascular Medicine (AREA)
  • Epidemiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
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  • Absorbent Articles And Supports Therefor (AREA)

Abstract

L'invention concerne un capteur de surveillance d'état d'absorption destiné à être utilisé dans un article absorbant jetable, comprenant un premier circuit de détection (20a), des mécanismes de protection étanches à l'eau (231, 271) et un mécanisme de réglage de diffusion d'infiltration. Le premier circuit de détection (20a) comprend une première électrode de détection (21) et une seconde électrode de détection (22). La première électrode de détection (21) et la seconde électrode de détection (22) comprennent une partie d'électrode protégée et une partie d'électrode non protégée Lorsque des déjections contenant un liquide électrolytique sont présentes dans l'article absorbant, un condensateur électrique à double couche peut être généré entre la première électrode de détection (21) et la seconde électrode de détection (22). La valeur de la capacité du condensateur est en corrélation positive avec la surface spécifique de la partie d'électrode non protégée infiltrée par le liquide électrolyte, et la surface spécifique augmente progressivement sous le mécanisme de réglage de diffusion d'infiltration. L'invention concerne un article absorbant intelligent jetable pouvant fournir des informations sur l'état d'absorption, un procédé de fabrication d'un capteur de surveillance de l'état d'absorption, un procédé de fabrication d'un article absorbant intelligent jetable, et un procédé de distinction de l'urine et des selles. Le capteur est peu coûteux, facile à produire et à utiliser, etc.
PCT/CN2020/125830 2019-11-04 2020-11-02 Capteur de surveillance d'état d'absorption pour article absorbant jetable, produit et procédé associés WO2021088761A1 (fr)

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CN202010410663.6A CN111297567A (zh) 2020-05-15 2020-05-15 一种可检测及区分大小便的吸收用品及相关方法

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WO2023024567A1 (fr) * 2021-08-27 2023-03-02 黄新凯 Article absorbant intelligent basé sur un film de détection et poche intégrée et dispositif associé

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CN115089382A (zh) * 2022-05-27 2022-09-23 深达创芯(深圳)科技有限公司 代谢物检测方法及护理用品
CN115980148B (zh) * 2023-03-22 2023-06-09 深圳一代科技有限公司 一种双电层电容式薄膜传感器及相关制品、装置与方法

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