JP2020169975A - Excrement sensor and preparation method - Google Patents

Abstract

To provide a simple, effective, and low cost excrement sensor.SOLUTION: An excrement sensor comprises a thin-film capacitive sensor. The sensor comprises a sensing bar. The sensing bar comprises an upper waterproof film, a lower waterproof film, a first detection electrode 21, a second detection electrode 22, and a first notch. One surface of the upper waterproof film and the lower waterproof film is bonded with each other to form an insulating interlayer. A main body part of the first detection electrode is located in the interlayer. The first notch penetrates the upper waterproof film, the lower waterproof film, and the first detection electrode located in the interlayer. As a result, the first detection electrode in the interlayer is exposed outwards through the first notch to form a first sensing line 21c, the first sensing line is in contact with an excrement 16 to be detected to generate a first double-electric-layer capacitor C1, and capacity of the first double-electric-layer capacitor is in direct proportion to a coverage range of the excrement to be detected on the first sensing line.SELECTED DRAWING: Figure 6a

Description

The present invention relates to a sensor, and is an electric double layer capacitor type excrement sensor capable of distinguishing stool and a method for manufacturing the same.

Disposable absorbent items include disposable sanitary products such as disposable diapers, sheet pad type disposable diapers, pants type disposable diapers, urine absorbing pads, sanitary napkins, etc., and all disposable absorbent articles have the problem of timely replacement. If the replacement is too frequent, it is troublesome and wasteful, if the replacement is too late, leakage is likely to occur, and if the excrement (especially the excrement such as loose stool) irritates the skin for a long time, diaper rash etc. Because it can cause skin disorders, sensors that can detect the excretory status of absorbent articles in real time have different status information and corresponding prompts for different excrement (eg, diapers, urine) and different degrees of moisture. Can be provided and has great significance for the scientific use and replacement of disposable absorbent articles.

In the prior art, a Chinese patent application with publication number CN10265608A discloses a liquid detector, method and paper diaper based on an electrochemical capacitor (ie an electric double layer capacitor), with an excrement sensor inside the leak prevention layer of the paper diaper. At least two carbon conductive inclines are printed as detection electrodes, and when wetting occurs, urine enters the absorption layer from the surface layer of the paper diaper, reaches the leakage prevention layer of the paper diaper, and then By contacting the detection electrode on the leakage prevention layer, generating an electric double layer capacitor on the electrode surface, and detecting the electric double layer capacitor, the wet state of the paper diaper can be grasped, and the larger the capacitance value, the more wet. Indicates that the degree becomes severe.

Conventional technical proposals have solved the problem of quantitative detection of wetness in disposable diapers, but there are also some technical flaws, one of which is that the resistance and capacitance of the sensor detection circuit are too large. Electric double layer capacitors, also called supercapacitors, have a very large capacitance, and the RC sensor detection circuit composed of them has a very large time constant and a very low detection speed (for example, several minutes). It also takes), and cannot meet the requirements for real-time state detection. In addition, it is easy for the reliability of the detection result to be lowered due to interference from the surrounding environment during a long detection period, which is a technology that needs to be solved for the current electric double layer capacitor type wet sensor. It is a problem.

Another defect of the prior art is that the adhesive is sprayed onto the detection electrodes during the production of disposable diapers, affecting the detection results. When producing paper diapers, the leak-proof layer, absorbent layer and surface layer must be adhered, and during the bonding, an adhesive (structural adhesive including hot melt adhesive) must be sprayed between each layer of the paper diaper. , These adhesives adhere to the surface of the detection electrode and adversely affect the contact between the electrode and urine, reduce the reliability of the detection result, and impair the quality of the product and the user experience.

The conventional technique also has a technical drawback that stools cannot be effectively detected and distinguished, and this problem is very important for excrement detection of disposable diapers. Since the detection electrode in the prior art is printed directly on a specific layer of the disposable diaper, it is troublesome and inflexible during production and use. The various shortcomings of the above prior art need to be resolved by new technical proposals.

The technical problem to be solved by the present invention is that the detection speed is very slow due to the extremely large capacitance and resistance existing in the conventional electric double layer capacitor type excrement detection system. Simple, effective and easy to solve problems such as stool distinction problem during excrement detection, the effect of adhesive on the detection electrode during production, and flexibility of production and use of the product. The purpose is to provide a low cost excreta sensor, and various specific detection systems and applications can be configured as needed.

In order to solve the above technical problems, the present invention provides an excrement sensor, includes a thin film capacitance sensor, the sensor includes a sensing bar, and the sensing bar is an upper waterproof thin film, a lower waterproof thin film. , A first detection electrode, a second detection electrode, and a first notch are included, and one surface of the upper and lower waterproof thin films is adhered to each other to form an insulating intermediate layer, and the first detection electrode is formed. The main body portion is located in the intermediate layer, and the first notch penetrates the upper waterproof thin film, the lower waterproof thin film, and the first detection electrode located in the intermediate layer, and as a result, the intermediate layer. The first detection electrode inside is exposed to the outside through the first notch to form a first sensing line, and the first sensing line comes into contact with the excrement to be detected and is the first. An electric double layer capacitor is generated, and the capacitance of the first electric double layer capacitor is directly proportional to the coverage range of the detection target excrement on the first sensing line.

The main body portions of the first and second detection electrodes are located in the intermediate layers of the upper and lower waterproof thin films, and are separated and insulated from each other, and the sensing bar further includes a second notch. The second notch penetrates the upper waterproof thin film, the lower waterproof thin film, and the second detection electrode located in the intermediate layer, and as a result, the second detection electrode in the intermediate layer is the notch. It is exposed to the outside through the second sensing wire to form a second sensing wire, and the second sensing wire contacts the detection target excrement to generate a second electric double layer capacitor, and the second electric double layer is formed. The capacitance of the capacitor is directly proportional to the coverage range of the excrement to be detected on the second sensing line, and the capacitance between the first and second detection electrodes is the first and second electric doubles. This is the series connection value of the multi-layer capacitor.

The second detection electrode is located on the outer surface of the upper waterproof thin film or the lower waterproof thin film, and is in direct contact with the excrement to be detected to generate a second electric double layer capacitor, and the second electric double layer is formed. The capacitance of the capacitor is directly proportional to the coverage range of the excrement to be detected on the second detection electrode, and the capacitance between the first and second detection electrodes is the first and second electric double layers. This is the series connection value of the multi-layer capacitor.

The first and second notches penetrating the first and second detection electrodes include a linear open type notch, which are located at two edges of the sensing bar in the lateral direction, respectively, and the intermediate layer. The first and second detection electrodes inside are exposed to the outside through the first and second notches to form sensing lines parallel to each other, and the first or second detection electrode is sensing. The first notch comprising a break point in the longitudinal direction of the bar or penetrating the first detection electrode includes a dotted line concealed notch, and the concealed notch is in the center of the first detection electrode. The first and second notches forming a sensing line approaching and hidden in position or penetrating the first and second detection electrodes include a rectangular notch, the rectangular notch comprising the sensing bar. A linear sensing line is cut out from the first and second detection electrodes, or at least a part thereof overlaps with the first and second detection electrodes, or the first detection electrode is penetrated. The first notch is a circular notch, and the circular notch approaches the central position of the first detection electrode and constitutes a circular sensing line.

The sensing bar includes a third detection electrode, the third detection electrode is located in the intermediate layer of the upper and lower waterproof thin films, and is not in contact with the detection target excrement during work, and the third detection is performed. The electrode constitutes an electrolytic capacitor together with the sensing wire and the excrement to be detected in contact with the sensing wire, and the third detection electrode and the sensing wire constitute an electrode of the electrolytic capacitor, and the waterproof thin film is formed. Consists of the dielectric of the electrolytic capacitor, the excrement constitutes the electrolyte of the electrolytic capacitor, and the capacitance value of the electrolytic capacitor is the area corresponding to the third detection electrode of the excrement on the surface of the waterproof thin film. Is directly proportional to.

The first and second detection electrodes include a carbon electrode produced by carbon conductive ink printing, and the width of the sensing line exposed to the outside through a notch is the thickness of the conductive ink printing. Consistent with the above, the upper and lower waterproof thin films include hydrophobic thin films and perform different surface actions on excreta with different viscosity, fluidity and adhesive force, thereby providing an excrement detection function that distinguishes stools. Realize.

Includes a disposable excrement carrier and absorber, has the appearance design of a normal disposable absorbent article, and includes a surface layer, an absorbent layer and a leak-proof layer, the sensing bar absorbing on or with the surface layer. A disposable intelligent absorbent article that is installed between layers or between the absorption layer and the leakage prevention layer and can provide excrement state information of a specific layer together with the surface layer, the absorption layer and the leakage prevention layer. Constitute.

A detection device including a capacitance detection unit is further included, the capacitance detection device is electrically connected to the first and second detection electrodes, and a quantitative detection function of excrement is realized by capacitance detection. To do.

It further includes a radio transmission unit and a radio reception and display device capable of transmitting, receiving and displaying related excrement status information or alarm information, said radio reception and display device including a mobile phone or tablet computer.

The present invention further provides a method for manufacturing an excrement sensor, which is suitable for mass production of an M-volume excrement sensor, and each volume includes N sensing bars of detection electrodes.
A step of installing M * (N-1) + 1 parallel detection electrodes by carbon conductive ink printing on any surface of a wide range of upper and lower waterproof thin film coil materials.
By adhering an arbitrary surface of the other wide waterproof thin film coil material on which the detection electrode is not installed to a wide range of waterproof thin film coil material on which the detection electrode is installed, one wide composite film coil material is generated, and the detection is performed. The electrodes are located in the intermediate layer of the wide composite film coil material.
The wide composite film coil material is slit in the M + 1 direction, and the detection electrode and the corresponding upper and lower waterproof thin film are cut at a position near the center of the detection electrode to open M + 1 straight lines. By generating a notch, an M-roll sensing bar coil material is generated, and each winding sensing bar coil material includes N detection electrodes, with a first detection electrode and a second detection electrode (N> = 2). (If there is) is located on both sides of the sensing bar and includes a first notch and a second notch, respectively, forming linear sensing lines in the first and second notches, and the other. The body portion of the detection electrode (when N> = 3) includes a step that does not include any notch or sensing line.

The beneficial effects of the present invention are as follows. The upper and lower waterproof thin films protect the main body of the detection electrode of the sensor, and then by installing a notch in the waterproof thin film, the detection electrode is exposed to the outside in the form of an ultra-narrow sensing line, and the width of the sensing line is widened. Is only one-thousandth of the width of the detection electrode, which significantly reduces the contact area between the detection electrode and the excrement to be detected and the resulting capacitance value, thereby significantly accelerating the speed of excrement detection. To do. In the present invention, since the heat-resistant thin film having excellent printing performance is used as the waterproof thin film and the detection electrode is printed directly on the waterproof thin film, the resistance of conductive ink printing can be effectively reduced. By further shortening the time constant of the sensor detection circuit, the detection speed is accelerated.

In addition, the present invention solves the problem of the influence of the adhesive on the detection electrode during the production of the disposable diaper by the notch, and solves the problem of distinguishing stool during the detection of excrement by the hydrophobic waterproof thin film, and the disposable diaper. It provided a simple, effective and low-cost solution for excrement detection and created conditions for intelligent upgrades of disposable diapers.

In order to more clearly explain the technical proposals of the embodiments of the present invention, the drawings that need to be used in the embodiments will be briefly described below, and the drawings that are clear and described below are merely some of the drawings of the present invention. It is an embodiment only, and one of ordinary skill in the art can further obtain other drawings based on these drawings without any creative effort.
It is a structural schematic diagram of the excrement sensor according to the Example of this invention. FIG. 5 is a schematic view of a hierarchical structure when the excrement sensor according to the embodiment of the present invention includes a sensing bar and a disposable excrement transporting and absorbing device. It is a hierarchical structure schematic diagram of the detection bar of the excrement sensor according to the Example of this invention. It is a structural schematic diagram in the case where the two edges of the detection bar of the excrement sensor according to the embodiment of the present invention include an open type notch. It is a side structure schematic diagram of the detection bar of the excrement sensor by the Example of this invention. It is a schematic cross-sectional structure diagram and the equivalent circuit diagram of AA'cross section of the sensing bar of the excrement sensor according to the embodiment of the present invention. It is a cross-sectional structure schematic diagram and equivalent circuit diagram in the case where the detection bar of the excrement sensor according to the embodiment of the present invention is installed between the surface layer and the absorption layer of the disposable diaper. It is a schematic diagram of the capacitance change curve during detection of urine excrement of the excrement sensor by the Example of this invention. It is a schematic diagram of the capacitance change curve during detection of stool excrement of the excrement sensor according to the embodiment of the present invention. It is a schematic diagram of the capacitance change curve during detection of excrement including excrement of the excrement sensor according to the embodiment of the present invention. It is a structural schematic diagram in the case where the detection bar of the excrement sensor according to the embodiment of this invention includes a rectangular notch. It is a structural schematic diagram in the case where the detection bar of the excrement sensor according to the Example of this invention contains a hidden notch. It is a structural schematic diagram in the case where the detection bar of the excrement sensor according to the Example of this invention includes a through hole notch. FIG. 5 is a schematic cross-sectional structure diagram and an equivalent circuit diagram when the detection bar of the excrement sensor according to the embodiment of the present invention includes a third detection electrode and is installed between the surface layer and the absorption layer of the disposable diaper. FIG. 6 is a schematic perspective view of a case where the sensing bar of the excrement sensor according to the embodiment of the present invention includes a third detection electrode and a through hole. It is a schematic diagram in the case where the detection bar of the excrement sensor according to the embodiment of the present invention is slit during production. It is a flowchart of the manufacturing method of the detection bar of the excrement sensor by the Example of this invention. It is a block diagram of the functional structure of the excrement sensor according to the Example of this invention.

The following description of each embodiment is for reference to the drawings to indicate specific feasible embodiments of the present invention. Directional and positional terms referred to in the present invention, such as "top", "bottom", "front", "rear", "left", "right", "inside", "outside", "top", "bottom" , "Side" and the like are only directions or positions with reference to the drawings. For this reason, the directional and positional terms used are for the purpose of explaining and understanding the present invention and do not limit the scope of protection of the present invention.

Hereinafter, the present invention will be further described with reference to the drawings. Referring to FIG. 1, the figure is a schematic structural diagram of an excrement sensor according to an embodiment of the present invention. In the figure, 10 is a disposable excrement transporting and absorbing device, which includes conventional disposable (disposable) absorbent articles (paper diapers, sheet pad type paper diapers, pants type paper diapers, urine absorbing pads, sanitary napkins, etc.). Including), the embodiments of the present invention can be regarded / referred to as disposable absorbent articles because of their appearance design and basic functions. These absorbent articles include a surface layer (inner layer, dry layer, facing the user's skin during use), a leak-proof layer (outer layer, bottom layer, facing the side opposite to the user's skin during use), and an absorbent layer (intermediate layer). , Located between the moisture absorption layer, the surface layer and the leak prevention layer).

In the figure, reference numeral 20 denotes a disposable thin film capacitance sensor (abbreviated as thin film sensor, capacitance sensor) installed in the absorbent article 10, including a sensing bar having a flexible band structure, and the sensing bar in the figure. Contains two parallel detection electrodes 21 and 22 (referred to as a first detection electrode and a second detection electrode, respectively), and is a combination of the first and second detection electrodes 21 and 22 (that is, a group of electrodes). Is marked with 23, and is generally printed on a waterproof thin film with conductive ink, so that the detection electrode is also called a conductive ink line. Further, since the conductive ink printing layer is thin and the entire sensing bar is flexible by printing on the flexible waterproof thin film, the detection electrode can also be called a flexible electrode. In the figure, the detection device 30 is further included, and is integrated and used by an electrical connection 24 between the detection device 30 and the detection electrode 23. The detection device 30 includes a capacitance detection unit, and can realize an excrement detection function for the absorbent article 10 by the capacitance. In practical applications, the absorbent article 10 and the thin film sensor 20 are generally disposable / disposable, and the detector 30 is installed outside the absorbent article and is removable and reusable.

Hereinafter, as shown in FIG. 2, the figure is a schematic diagram of a hierarchical structure in the case where the excrement sensor according to the embodiment of the present invention includes a sensing bar and a disposable excrement transporting and absorbing device. Hereinafter, using a disposable diaper as an example. The description and related description are also suitable for other disposable absorbent articles such as sheet pad type disposable diapers, pants type disposable diapers, urine collecting pads and sanitary napkins. The disposable diaper in the figure includes a surface layer 11, an absorption layer 12, and a leakage prevention layer 15. During use, the surface layer 11 is in direct contact with the skin of the human body (eg, covering the crotch of the human body), and when the human body urinates, the urine fluid is absorbed through the surface layer 11 which is hydrophilic and loose and breathable. It enters and is absorbed by substances such as wood pulp and polymer absorbent material (SAP) in the absorption layer, which has the function of moisture locking and gradually restores the surface layer 11 to a dry state. The leak-preventing layer 15 mainly serves to prevent leakage of urine, and is generally made of a polyethylene thin film (PE) that is waterproof and breathable or non-breathable.

Unlike the conventional method of printing the detection electrode directly on the leakage prevention layer (or other layer) of the disposable diaper as a sensor, the embodiment of the present invention prints the detection electrode on the detection bar 20 and is an independent disposable thin film. Configure the sensor, which provides greater flexibility for product applications. In the embodiment of the present invention, the mark 20 not only indicates a sensing bar, but also indicates a thin film sensor, and in most cases, the sensing bar of the embodiment of the present invention has the same meaning as the thin film sensor, and the sensing bar. / The thin film sensor constitutes the smallest unit of the excrement sensor of the embodiment of the present invention. In the figure, the sensing bar 20 includes an electrode group 23, and 23 includes two or more detection electrodes (including a first detection electrode 21 and a second detection electrode 22 in the figure). The sensing bar 20 of this embodiment is installed between the surface layer 11 of the disposable diaper and the absorbing layer 12, and in an actual application, the sensing bar 20 is placed on the surface layer 11 of the disposable diaper or between the absorbing layer 12 and the leakage prevention layer 15. It may be installed in between. For convenience of expression, each component of the disposable diaper of this embodiment (including the surface layer 11, the absorption layer 12, the leakage prevention layer 15, and the sensing bar 20) is drawn in layers. In a practical application, each of the above components is bonded with an adhesive (structural adhesive containing a hot melt adhesive), the surface layer and leakage prevention layer of the paper diaper are longer than the absorption layer, and the absorption layer is the liquid in the absorption layer. Can be wrapped to prevent leakage. After undergoing the above treatment, the sensing bar 20 together with the surface layer 11, the absorbing layer 12, and the leakage prevention layer 15 constitutes a disposable intelligent absorbent article capable of providing excrement state information of a specific layer, and here, intelligently. It may be called a disposable diaper.

In the figure, the length of the sensing bar matches the length of the disposable diaper, the entire sensing bar penetrates the entire disposable diaper, and any excrement can be detected at any position in the longitudinal direction of the disposable diaper. It is a concept, which is very different from the local detection concept of some external capacitive sensors (non-intrusive sensors) in the prior art. Non-invasive sensors are generally glued to specific locations on disposable diapers to provide local wetting detection and are undetectable or significantly attenuated when urine is wet / excrement is present outside the sensor. And a clear non-linearity occurs. In practical applications, the present invention may optionally select the length of the sensing bar, eg, lengthening it to facilitate electrical connection with the detector, the amount of sensing bar used. It may be shortened to save such things.

Hereinafter, as shown in FIG. 3, the figure is a schematic diagram of the hierarchical structure of the detection bar of the excrement sensor according to the embodiment of the present invention. In the figure, reference numeral 20 denotes a sensing bar, which is a lower waterproof thin film 25, an upper waterproof thin film 26, and a first detection electrode 21 and a second detection electrode 22 (electrode group 23) printed / installed on the inner surface of the lower waterproof thin film. And generically). In actual application, the detection electrode 23 may be printed on the inner surface of the upper waterproof thin film, if necessary. In the embodiment of the present invention, the surface of the waterproof thin film facing the intermediate layer is referred to as an inner surface, and the surface of the waterproof thin film facing the intermediate layer is referred to as an outer surface. For convenience of expression, each component of the sensing bar (including the electrode group 23, the lower waterproof thin film 25, and the upper waterproof thin film 26) is drawn in layers in the drawing. In a practical application, each of the above components may be adhered with an adhesive and the parts may be thermally fused by a process such as hot pressing.

In the examples of the present invention, the main reason for wrapping / covering the detection electrode with the upper and lower waterproof thin films is to reduce the ratio of exposure of the detection electrode to the outside / contact with the excrement to be detected. The capacitance (capacitance value, capacitance value) of the electric double layer capacitor generated during detection is reduced. According to the electric double layer capacitor theory, the electrolyte liquid (eg, urine, loose stool, etc.) is contacted with a solid electrode (eg, a carbon electrode, preferably a detection electrode produced by carbon conductive ink printing in the embodiments of the present invention). In this case, an electric double layer capacitor is generated at the interface, and when a DC voltage is applied between the two electrodes, negative ions in the liquid accumulate in the positive electrode and positive ions accumulate in the negative electrode, and these liquids. The positive and negative ions inside form a single layer of ionic dielectric with the opposite ions in the electrode, creating a so-called electric double layer capacitor. Electric double layer capacitors, also called "supercapacitors", are generally very large in capacitance and are usually shown in a "short circuit" state when measuring their "resistance" from both poles of the capacitor with a resistance detector. It is usually thought that the conductive liquid "shorted" the electrodes, and in fact, the capacitance is so large that it is difficult to detect the "boundary" (magnitude of the capacitance value) of the capacitor. The "short circuit" state described above is shown.

After the detection electrode 23 is covered with the upper and lower waterproof thin films 26 and 25, the main body portion thereof is protected by a sealed insulating intermediate layer composed of the upper and lower waterproof thin films, and is exposed to the outside only through the gap of the insulating intermediate layer. The exposed portion changes from the width of the original detection electrode to the "thickness" of conductive ink printing (ie, the thickness of the intermediate layer), which is one of the main differences between the examples of the present invention and the prior art. is there. The conductive ink printing of the examples of the present invention is preferably gravure printing, and the thickness of the gravure printing layer is generally only 5 to 8 microns, which is about one-thousandth of the width of the conventional detection electrode. (That is, 99.9% of the detection electrode area is protected, and the protected portion constitutes the main body portion of the detection electrode), so that the contact area between the detection electrode and the excrement to be detected can be significantly reduced. It can, thereby significantly reducing the capacitance value of the generated electric double layer capacitor, at which time the resistance value can rise rapidly if the "resistance" is measured from both ends of the capacitor with a resistance detector. You can see, that is, the "boundary" of the capacitor can be detected quickly, which allows the capacitance value of the capacitor to be calculated quickly, resulting in a significant reduction in the detection cycle (the time constant according to equation τ = RC). (It can be seen that it is directly proportional to the resistance and capacitance of the detection circuit), the original "minutes" is shortened to "seconds" and then "milliseconds", that is, the system detection speed is improved by several thousand times. In the embodiment of the present invention, an electric double layer capacitor is generated by a detection electrode installed in a sensing bar, and then a quantitative detection of wetness is realized by detecting a capacitance between the electrodes. The excrement sensor is also called a thin film electric double layer capacitor sensor.

In practical applications, the width of the sensing bar should be moderate, and if it is too wide, the sensing bar will be impermeable, which not only increases the cost but also affects the permeability of the surface of the disposable diaper. If it is too narrow, the tensile strength of the sensing bar will be reduced, and it is easy for the detection bar to break during use. Theoretically, the width of the sensing bar may be 5 to 50 millimeters, but 10 to 30 millimeters is more suitable, preferably 15 to 25 millimeters wide, which is the optimum cost-effectiveness of the sensing bar. To realize the conversion.

Different materials have different requirements for the thickness of the waterproof thin film. In practical applications, the thickness may be 5 to 500 microns, preferably 10 to 30 microns. In practical applications, preferably biaxially stretched polypropylene film (BOPP) and polyester film (PET), which have high tensile properties, are selected as the waterproof thin film, and these two thin films are all hard plastic films, and conventional paper diapers. Not only has a much higher tensile strength than the polyethylene (PE) film often used for, but also has a higher heat resistance than the PE film, and when printing conductive ink on BOPP / PET, a high temperature hot air blower (120 to It can be dried at (150 ° C), which not only allows faster printing, has a lower resistance value, the drying temperature of conventional PE film printing generally does not exceed 60 ° C, and the coloring performance of PE film is also low. The resistance value after printing is usually several times that of POFF / PET film printing.

In the examples of the present invention, a lower waterproof thin film may be used on the same thickness and material, or a lower waterproof thin film may be used on different thicknesses and materials. For example, BOPP / PET with excellent tensile strength and printing performance is selected as the printed thin film, and then composited with it using a flexible PE / EVA film, so that the sensing bar is flexible. And balanced in terms of tensile strength. A waterproof coating may be directly applied to the detection electrode instead of the waterproof thin film to generate a waterproof coating. In such a case, the waterproof coating can be regarded as one of the waterproof thin films. In this embodiment, after the upper and lower waterproof thin films are combined, the thickness of the entire sensing bar is generally 0.01 to 1 mm. It may be 2 to 20 mm, preferably 4 to 10 mm, and the distance between the detection electrodes may be 0.2 to 20 mm, preferably 1 to 10 mm with respect to the width of the detection electrode. The thickness of the detection electrode (thickness of conductive ink printing) may be 1 to 30 microns, preferably 4 to 10 microns.

Further, since the waterproof thin film of the embodiment of the present invention is impermeable and non-breathable, it effectively protects the detection electrodes in the intermediate layer, and water vapor permeates the waterproof thin film to cause electrical leakage between the detection electrodes. Prevents short circuits, which are essentially different from the waterproof breathable membranes commonly used in conventional absorbent articles.

Hereinafter, as shown in FIG. 4, the figure is a schematic structural diagram in the case where the two edges of the detection bar of the excrement sensor according to the embodiment of the present invention include an open notch. In the figure, 20 is a sensing bar, 21 and 22 are first and second detection electrodes, and constitute an electrode group 23. After the upper and lower waterproof thin films are composited / bonded, the detection electrode is sandwiched between the upper and lower waterproof thin films and sealed and insulated. In order to expose the detection electrodes located in the intermediate layer of the upper and lower waterproof thin films to the outside more properly, the first detection electrodes 21 in the drawing are notched 21c (the first cut at the outer edge of the first detection electrodes). (Notch) is included, and the second detection electrode 22 includes a notch 22c (a second notch cut at the outer edge of the second detection electrode). During production, a cutting knife (or roller brake knife) is typically used to cut the sensing bars adjacent to the 21c, 22c positions into the composite membrane coil material containing the sensing bars. It is possible to generate a sensing bar with an open notch (multiple volumes).

After having the notches, the first and second detection electrodes can be exposed to the outside by a neat notch at these edges, which allows contact with the excrement to be detected and thus the associated excretion. An object detection function can be realized. The detection electrode is exposed to the outside by the notch, the width of the exposed detection electrode is equal to the ink printing thickness of the detection electrode, and the conductive ink printing thickness is generally 5 to 25 microns, if gravure printing is adopted. The thickness is only approximately 5-8 microns, which can significantly reduce the contact area between the detection electrode and the excrement to be detected, thereby the capacitance of the electric double layer capacitor generated during detection. The value can be significantly reduced.

Hereinafter, as shown in FIG. 5, the figure is a schematic side view of the side structure of the detection bar of the excrement sensor according to the embodiment of the present invention. In the figure, 20 is a sensing bar, 25 is a lower waterproof thin film, 26 is an upper waterproof thin film, and 23 is a linear detection electrode viewed from the side surface. Since the electrode of the sensing bar according to the embodiment of the present invention is mainly for sensing excrement, the linear portion where the sensing electrode is exposed to the outside through the notch may be called a “sensing line”. Yes, in the figure, the detection electrode 23 and the sensing line overlap, and the sensing line can be marked at 23c. The width of the sensing line according to the embodiment of the present invention is equal to the thickness of the conductive ink line (detection electrode) printed on the waterproof thin film with the conductive ink, and is generally 5 to 25 microns. In the examples of the present invention, gravure conductive ink printing is preferable, the thickness thereof can be controlled to 5 to 8 microns, the width can be indicated by "one line", and in practice, "one line" Narrower than "line". Unless otherwise specified, the sensing lines according to the embodiments of the present invention all refer to ultra-narrow sensing lines generated by notches. In FIG. 4, the sensing lines exposed by the first and second detection electrodes 21 and 22 through the first and second notches 21c and 22c are referred to as the first sensing line and the second sensing line, respectively. In the figure, since the notch and the sensing line overlap, 21c and 22c may represent the first and second sensing lines.

Hereinafter, as shown in FIGS. 6a and 6b, the figure is a schematic diagram of the AA'cross-sectional structure and the equivalent circuit diagram of the detection bar of the excrement sensor according to the embodiment of the present invention, in which 20 is a detection. A bar, 26 is an upper waterproof thin film, 25 is a lower waterproof thin film, 21 and 22 are first and second detection electrodes coated and insulated by the upper and lower waterproof thin films, and 21c and 22c are. The first and second sensing lines are exposed to the outside through a notch in the intermediate layer of the upper and lower waterproof thin films, and 16 is a detection target excrement containing an electrolyte and immersing the sensing bar. Is. After the excrement 16 has penetrated the first and second sensing lines 21c and 22c, an electric double layer capacitor is generated on the liquid / solid surface of the excrement and the sensing wire, respectively, and the first sensing wire and the second sensing wire are generated, respectively. In order to correspond to the sensing wire, they are called the first electric double layer capacitor C1 and the second electric double layer capacitor C2, and their capacitance values (capacitance, capacitance value) are the contact between the excrement and the sensing wire. It is directly proportional to the area. Since the width of the sensing line (that is, the thickness of the detection electrodes 21 and 22) is constant, in such a case, the capacitance value is directly proportional to the covering range (length) of excrement on the sensing line. The larger the capacitance value, the more severe the degree of excrement covering and penetrating the sensing bar.

Since the excrement 16 containing the electrolyte is conductive, the capacitors C1 and C2 are electrically connected (connected in series) by the excrement 16. As shown in FIG. 6b, when viewed from both ends of the first and second detection electrodes 21 and 22, the capacitance value C is detected, and the capacitance is equal to the series connection value of the capacitors C1 and C2, that is, C =. It is C1 * C2 / (C1 + C2). In the figure, the first and second detection electrodes of the embodiment of the present invention are equivalent, and both include a sensing wire generated through a notch, and thereby reduce the value of the electric double layer capacitor. To achieve. In a practical application, the first and second detection electrodes may not be equivalent, any one electrode (eg, the first detection electrode) is covered with an upper and lower waterproof thin film and the sensing line in the notch The purpose of reducing the capacitance can be achieved by contacting the excrement to be detected, and the other electrode (for example, the second detection electrode) comes into contact with the excrement to be detected without protection and has a large capacitance. Can be received even if you generate. For example, the second detection electrode can be installed on the outer surface of the waterproof thin film, and the generated second electric double layer capacitor C2 is directly proportional to the coverage range of the excrement to be detected on the second detection electrode. Since the capacitance C between the electrodes is equal to the series connection value of C1 and C2 and C after series connection is smaller than the capacitance of any one of C1 and C2, the purpose of reducing the capacitance is also realized. can do. A situation in which only one detection electrode contains a sensing line can be considered as one exception or variation of the embodiments of the present invention and still falls within the scope of the present invention. In the above cases, in the embodiment of the present invention, the electrode installed / protected in the intermediate layer is referred to as the first detection electrode, and the electrode installed / unprotected outside the intermediate layer is referred to as the second detection electrode. It is called the detection electrode of.

Hereinafter, as shown in FIG. 7, the figure is a schematic cross-sectional structure diagram and an equivalent circuit diagram when the detection bar of the excrement sensor according to the embodiment of the present invention is installed between the surface layer and the absorption layer of the disposable diaper. .. The sensing bar 20 in the figure is installed between the surface layer 11 of the disposable diaper and the absorbing layer 12, and is a first detection electrode located in the intermediate layers of the upper waterproof thin film 26, the lower waterproof thin film 25, and the upper and lower waterproof thin films. The 21st, the second detection electrode 22, and the first sensing line 21c and the second sensing line 22c exposed to the outside through the edge portion (notch) of the intermediate layer in the intermediate layer are included.

When wetting occurs (for example, urination), the urine liquid 16 first permeates the surface layer 11 of the disposable diaper, and then permeates the interface 17 of the surface layer / absorption layer from both sides of the sensing bar 20 into the absorbent layer 12 of the disposable diaper. In this process, the urine 16 comes into contact with the sensing lines 21c and 22c at the outer edge of the sensing bar 20, thereby forming between the first and second detection electrodes 21 and 22. An electric double layer capacitor C is generated. The urine liquid is absorbed by the absorption layer 12, and the surface layer 11 of the disposable diaper gradually recovers to a dry state, particularly after the water is locked by the polymer material SAP in the absorption layer. Above and below the sensing bar The waterproof thin film is hydrophobic, the absorbent layer of the paper diaper is hydrophilic, and the moisture on the hydrophobic material is gradually absorbed by the hydrophilic material, so that the notches 21c and 22c are above. Moisture is gradually reduced, thereby reducing the liquid coverage range / penetration degree, and as a result, the capacitance C is returned from a high peak and gradually reduced, exhibiting damping characteristics.

The situation changes when the surface layer 11 of a disposable diaper is infiltrated by loose stool instead of urine. Due to the high viscosity, low fluidity and strong adhesion of loose stool, loose stool adheres / remains in the notches 21c / 22c on both sides of the sensing bar, providing a lasting effect on the sensing lines on the notch, resulting in , The capacitance C between the first and second detection electrodes is basically unchanged, that is, the attenuation is small or does not decrease. By continuously monitoring the value C of the electric double layer capacitor output by the excrement sensor and analyzing the change discipline, it is possible to effectively realize the excrement detection function of the disposable diaper and the stool discrimination function. ..

The detection electrode in the above-mentioned prior art is installed on the inner surface of the leakage prevention layer of the disposable diaper and faces the absorption layer, and the adhesive is detected when the adhesive is sprayed on the leakage prevention layer and adheres to the absorption layer of the disposable diaper. Since it is sprayed on the electrode, it affects the contact between the electrode surface and the urine, and reduces the reliability of the detection result. The sensing bar 20 of this embodiment is usually installed and independent between the surface layer 11 and the absorbing layer 12 of the paper diaper, and after the adhesive spraying of the absorbing layer / surface layer is completed, the sensing bar is inserted and the absorbing layer and the surface layer are inserted. Can adhere to each other and the adhesive will not be sprayed directly onto the sensing bar. At the same time, in the embodiment of the present invention, the sensing line generated through the notch faces both sides of the absorbent article and does not face the adhesive surface of the absorbent article, so that the adhesive on the adhesive surface of the absorbent article is It is also possible to prevent the adhesive from being adhered to the sensing wire of the notch, thereby solving the problem that the adhesive in the above-mentioned prior art is adhered to the detection electrode and the reliability of the detection result is lowered.

Hereinafter, as shown in FIG. 8, the figure is a schematic diagram of a capacitance change curve during detection of urine excrement of the excrement sensor according to the embodiment of the present invention as shown in FIG. In the figure, the abscissa is time t, the ordinate is the value C of the electric double layer capacitor between the first detection electrode 21 and the second detection electrode 22 of the sensing bar, and the paper diaper is dried. If so, the capacitance C from the origin of the coordinates to the time T0 is zero, and when wetting / urination occurs at the T0 point, the capacitance C rapidly increases from 0 to Ct1 and the capacitance is increased. The capacitance value is directly proportional to the diffusion of urine fluid in the longitudinal direction of the paper diaper (that is, the coverage range / penetration length of the liquid with respect to the detection electrode). When the time reaches T1, urination continues, but the diffusion rate of urine in the longitudinal direction of the disposable diaper becomes weaker, so that the rate of increase of the capacitance C begins to slow down. When the time T2 is reached, urination stops and begins to return after the capacitance value reaches the highest point Ct2, and as the polymer material SAP in the absorbent layer of the disposable diaper absorbs and locks moisture, the disposable diaper The surface layer gradually recovers to a dry state, and at T3, the capacitance C returns to Ct3 and Ct3 is much smaller than Ct2, so that the absorption layer of the disposable diaper is not saturated, and the corresponding absorption capacity / margin is further increased. Indicates to have.

Hereinafter, as shown in FIG. 9, the figure is a schematic diagram of a capacitance change curve during detection of stool excrement of the excrement sensor according to the embodiment of the present invention as shown in FIG. 7. The capacitance curve changes when it is loose stool, not urine, that has penetrated the disposable diaper / crossed the sensing bar 20. Since both the fluidity and diffusivity of loose stool are lower than that of urine, the rate of increase of the capacitance C curve between the first and second detection electrodes of the sensing bar becomes relatively slow during the period T0 to T2, and T2 After reaching, defecation has already stopped, but loose stool is adhered to the sensing bar 20 and the notches 21c and 22c on both sides and penetrates the sensing wire, so that the electric double layer capacitor C generated in the sensing wire is maintained. Up to time T3, the capacitance value Ct3 still corresponds to Ct2, that is, the capacitance C decays slowly with respect to loose stool excrement, and thus does not decay within a certain time range. By analyzing the attenuation discipline of C, it can be determined whether the excrement to be detected is urine (urine) or stool (feces).

Hereinafter, as shown in FIG. 10, the figure is a schematic diagram of a capacitance change curve during detection of excrement including excrement of the excrement sensor according to the embodiment of the present invention as shown in FIG. 7. When excrement is mixed with excrement at the same time, the capacitance change curve is interposed between FIGS. 8 and 9. Since the upper and lower waterproof thin films have hydrophobicity (or the upper and lower waterproof thin films include hydrophobic thin films), they perform different surface actions on excreta having different viscosities, fluidity and adhesive force, and the electric double layer Affects both capacitance value and change discipline of capacitors, fast capacitance decay due to urine with high fluidity, low viscosity and low adhesive force (shown in FIG. 8), low fluidity, high viscosity and high adhesive force. Capacitance decay due to loose stool is slow (shown in FIG. 9). By analyzing the capacitance attenuation discipline, it is possible to realize an excrement detection function that distinguishes stools.

Hereinafter, as shown in FIG. 11, the figure is a schematic structural diagram when the sensing bar of the excrement sensor according to the embodiment of the present invention includes a rectangular notch. The notches 21c and 22c of the embodiment shown in FIG. 4 described above are installed at the two edges of the sensing bar 20 and are straight open type notches, and the notch 23c of the present embodiment is a discontinuous rectangular cutout. It is a notch (hollow notch), a part is dug from the center position (that is, the non-edge position) of the sensing bar, and the first detection electrode 21, the second detection electrode 22, and the corresponding upper and lower waterproofing are performed. A thin film is cut, or a portion of the rectangular notch 23c overlaps the first and second detection electrodes, thereby producing linear first and second sensing lines 21c and 22c.

Hereinafter, as shown in FIG. 12, the figure is a structural schematic diagram in the case where the sensing bar of the excrement sensor according to the embodiment of the present invention includes a hidden notch. In the figure, a plurality of dotted hidden notches 21c and 22c are included, and these dotted hidden notches are discontinuous in order to avoid completely dividing the detection electrodes 21 and 22. .. In the hidden notches 21c and 22c, ultra-narrow gaps are opened in the upper and lower waterproof thin films near the center position (not the edge position) of the first and second detection electrodes, and the first and second detection electrodes are formed. The detection electrodes 21 and 22 can be exposed to the outside through these gaps, thereby forming a hidden first and second sensing line and can be indicated by 21c and 22c.

In the embodiment of the present invention, the notch provided in the first detection electrode is referred to as a first notch, the notch provided in the second detection electrode is referred to as a second notch, and the first The sensing line generated by the notch is called the first sensing line, and the sensing line generated by the second notch is called the second sensing line, regardless of the actual number of notches and sensing lines.

Hereinafter, as shown in FIG. 13, the figure is a structural schematic diagram in the case where the sensing bar of the excrement sensor according to the embodiment of the present invention includes a through hole notch, and in the drawing, the sensing bar 20 is provided with a through hole. The installation creates a circular notch and forms a circular sensing line. In the figure, 21c and 22c are a series of through holes that separate from each other, and these through holes are the upper and lower waterproof thin films, the first detection electrode 21, and the second detection electrode 22 (not the edge position, but). It penetrates (approaches the central position of the electrode), generates circular first and second sensing lines on the hole wall of the through hole, and is exposed to the outside through the through holes 21c and 22c.

The above embodiment of the present invention cites several different notch methods, and in practical applications there are more available notch methods. Regardless of which notch method is used, the notch cuts the upper and lower waterproof thin films and the corresponding detection electrodes, so that at least part of the detection electrodes is exposed to the outside through these notches. do it. For this reason, all other notch methods or combinations of different notches not listed here can be considered as variations of the embodiments of the present invention and all fall within the scope of the present invention.

Hereinafter, as shown in FIG. 14, the figure shows a cross section when the detection bar of the excrement sensor according to the embodiment of the present invention includes a third detection electrode and is installed between the surface layer and the absorption layer of the disposable diaper. It is a structural schematic diagram and an equivalent circuit diagram, which is an extension or modification of the embodiment shown in FIG. 7 described above. In the figure, reference numeral 20 denotes a sensing bar, which is installed between the surface layer 11 of the disposable diaper and the absorbing layer 12, and is located in the intermediate layers of the upper waterproof thin film 26, the lower waterproof thin film 25, and the upper and lower waterproof thin films. The detection electrode 21, the second detection electrode 22, and the first detection line 21c and the second detection line 22c exposed to the outside through the intermediate layer edge (notch) in the intermediate layer are included.

In an embodiment of the present invention, a third detection electrode 27 is further included, installed between the first and second detection electrodes 21 and 22, and completely covered and protected by upper and lower waterproof thin films 26 and 25 to work. It is not in contact with the excrement 16 and 18 to be detected. In the presence of excrement (eg, urine), the urine 16 first penetrates the surface layer 11 of the disposable diaper, then penetrates the interface 17 between the surface layer of the disposable diaper and the absorption layer from both sides of the sensing bar 20 and the disposable diaper. Flows into the absorption layer 12 of the diaper and forms a permeation region 18 (urine fluid in the permeation region is also indicated by 18). In the above process, the urine fluid comes into contact with the sensing lines 21c and 22c and creates an electric double layer capacitor C between the detection electrodes 21 and 22. Since the urine liquid containing the electrolyte has conductivity, the urine liquid 16/18 acts as a "liquid electrode" after contacting 21c / 22c, and becomes an extension of the detection electrode 21/22, and the urine liquid as a liquid electrode. When extending to the upper and lower surfaces of the waterproof thin film corresponding to the third detection electrode 27, the capacitors C13 (between the first and third detection electrodes) and C23 (of the second and third detection electrodes) together with the electrode 27 Since the urine fluid acts as a "liquid electrode", the capacitors C13 and C23 belong to the electrolytic capacitor, 21 and 27 are the electrodes of the electrolytic capacitor C13, and 22 and 27 are the electrodes of the electrolytic capacitor C23. The upper and lower waterproof thin films 26 and 25 constitute the dielectric of the electrolytic capacitors C13 and C23, the liquids 16 and 18 form the electrolyte of the electrolytic capacitors C13 and C23, and the capacitances of C13 and C23 are the same. It is directly proportional to the area of the liquid to be detected on the upper and lower surfaces of the waterproof thin film corresponding to the detection electrode 27 of 3. By detecting the capacitance value of the electrolytic capacitor, the existence state of the liquid on the upper and lower surfaces of the third detection electrode can be known, and the quantitative detection function of wetting can be realized, that is, whether or not wetting has occurred. Not only can you know if it is wet, but you can also know how wet it is.

Hereinafter, as shown in FIG. 15, the figure is a schematic perspective view of a case where the detection bar of the excrement sensor according to the embodiment of the present invention includes a third detection electrode and a through hole, and is shown in FIG. This is a change of example. In the figure, the first detection electrode 21 is exposed to the outside through the notch 21c at the edge of the detection bar and constitutes the first detection line, and the second detection electrode 22 in the center is a series of penetrations. It is exposed to the outside through the hole 22c and constitutes a second sensing line, and the third detection electrode 27 is located on the other side of the sensing bar, has no notch in the work area, and excretes the detection target during work. It does not come into contact with an object at all, and the corresponding electrolytic capacitors are formed together with the first and second detection electrodes, respectively, and the wetness quantitative detection function can be realized by the electrolytic capacitors. The first and second detection electrodes 21 and 22 in the figure can contact the excrement to be detected via the sensing lines on the notches 21c and 22c, respectively, and can generate the corresponding electric double layer capacitor. As a result, the function of detecting excrement and distinguishing between stools is realized. In the figure, the left-right direction is the longitudinal direction of the sensing bar, the left and right ends in the longitudinal direction are non-working areas, and there are cutting lines, but they do not form a sensing line that contacts the excrement to be detected.

Hereinafter, as shown in FIGS. 16a and 16b, the figure is a schematic view of the case where the sensing bar of the excrement sensor according to the embodiment of the present invention is slit during production. In order to improve the production efficiency of the sensing bar, in a practical application, a plurality of sets of detection electrodes are usually printed on a wide waterproof thin film having a length of several thousand meters per roll, and then the detection electrodes are printed on the waterproof film. A thin film and another waterproof thin film are composited (adhered) to form a wide composite film of one roll, and in this way, a plurality of sets of detection electrodes are covered and protected by two wide waterproof thin films, one above the other. In order to obtain a sensing bar that is suitable for use and contains a set of detection electrodes, the composite membrane containing the plurality of sets of detection electrodes described above must be slit.

This embodiment includes the two cases of FIGS. 16a and 16b and can be used in the production of a sensing bar including the three detection electrodes shown in FIG. In FIG. 16a, 20N is part of a roll of composite membrane containing multiple sets of detection electrodes (actual length is much longer than the length shown in the figure), 20-1, 20 in the figure. Since three sets of detection electrodes -2 and 20-3 are included and each set of detection electrodes can form a detection bar, three sets of detection bars 20-1, 20-2 and 20-3 are used. Each may be represented. In practical applications, one wide composite membrane may include tens and thus hundreds or more sensing bars. If the length of the composite film is 3000 meters, the width is 1 meter, and the width of the sensing bar is 2 centimeters, one roll of the composite membrane is 50 rolls of the sensing bar coil material (3000 meters long). (Thin film material for roll packaging) can be slit. These sensing bar coil materials are the raw material for producing disposable diapers, during production the sensing bar is placed between specific layers of the disposable diaper (eg surface layer and absorbent layer), then adhered to the surface and absorbent layers of the disposable diaper, and finally. By cutting the disposable diaper according to the length required for the diaper, one intelligent disposable diaper product including a sensing bar can be completed.

Each of the sensing bars in the figure includes three detection electrodes, which are the first, second and third detection electrodes 21, 22 and 27, respectively. In the figure, 20c is a slitting line, and after the slitting is performed on the 20c, the originally connected first and second detection electrodes 21/22 can be slit. After slitting, the first and second detection electrodes 21 and 22 located on both sides of the sensing bar can be exposed to the outside through the slitting wire 20c and constitute the sensing wire and by the electric double layer capacitor. It is possible to realize a stool detection function. For the third detection electrode 27, located between the first and second detection electrodes 21 and 22 after slitting, it is completely covered and protected by the upper and lower waterproof thin films, and there is no notch intersecting with it. Therefore, only one electrolytic capacitor is configured with the first and second detection electrodes 21 and 22, respectively, and the wetness quantitative detection function is realized by the electrolytic capacitor.

The sensing bar coil material is cut at 20e depending on the length required during the production of the intelligent disposable diaper (usually matching the length of the disposable diaper). There is a cut in the cutting line 20e, but it is located in the non-working area of the sensing bar (the head and tail positions of the disposable diaper, that is, the anterior abdomen and the posterior lumbar position, respectively), and contacts the excrement to be detected of the absorbent article during work. Therefore, it does not form a "cutout" and a "sensing line" that have a specific meaning in the embodiment of the present invention and come into contact with the excrement to be detected. In the figure, the composite membrane 20N can be used to manufacture three sensing bars, with the rest above the sensing bars (20-1) and below the sensing bars (20-3) treated as waste material. To do. To overproduce more sensing bars at once, more sensing electrodes need to be printed on the waterproof thin film.

16b is a variation of FIG. 16a, where FIG. 6b shows only one sensing bar 20-1, including a first detection electrode 21, a second detection electrode 22, and a third detection electrode 27. In addition, the first notch 21c and the second notch 22c are included in the two edges of the sensing bar in the lateral direction (upward and downward in the figure), and the first and second cuts are provided. The notch produces the first and second sensing lines.

The difference from FIG. 16a is that the sensing bar of FIG. 16b includes a blank area 28 without detection electrodes on both the left and right sides of the cutting line 20e in the longitudinal direction (horizontal direction in the drawing), and the detection electrode in the sensing bar is Since the blank region 28 is interrupted / disappears in the blank region, the blank region 28 may be called the “breaking point” of the detection electrode. The breaking point has a cutting line 20e, but since it does not intersect the detection electrode, the detection electrode passes through the cutting line 20e. Therefore, it is not exposed to the outside, and therefore, a sensing line that comes into contact with the excrement to be detected is not formed. The cutting line 20e is located at both ends of the head and tail of the disposable diaper product, and due to the presence of the breaking point, the moisture (for example, sweat produced) at the head and tail of the disposable diaper serves as an excrement detection function of the detection bar 20. It is possible to prevent the influence.

Hereinafter, as shown in FIG. 17, the figure is a flowchart of a method for manufacturing a sensing bar of an excrement sensor according to an embodiment of the present invention, and an M-volume sensing bar is overproduced at one time in one production probe. Suitable, each roll contains a sensing bar coil material of N detection electrodes, which
Step S1701 in which M * (N-1) + 1 parallel detection electrodes are installed on any surface of a wide range of upper and lower waterproof thin film coil materials by carbon conductive ink printing.
By adhering an arbitrary surface of the other wide waterproof thin film coil material on which the detection electrode is not installed to a wide range of waterproof thin film coil material on which the detection electrode is installed, one wide composite film coil material is generated, and the detection is performed. The electrodes are located in step S1702, which is located in the intermediate layer of the wide composite film coil material.
The wide composite film coil material is slit in the M + 1 direction, and the detection electrode and the corresponding upper and lower waterproof thin film are cut at a position near the center of the detection electrode to open M + 1 straight lines. Includes step S1703, which produces an M-roll sensing bar coil material by creating a notch.

The sensing bar coil material of each winding includes N detection electrodes, and the first detection electrode and the second detection electrode (when N> = 2) are located on both sides of the sensing bar and are each the first. A notch and a second notch are included, a linear sensing line is formed in the first and second notches, and the main body portion of the other detection electrode (when N> = 3) is any cut. Does not include notches and sensing lines.

The above method flow is a summary of the production flow shown in FIGS. 16a and 16b in which the sensing bar is manufactured by the slitting method. In the embodiment shown in FIGS. 16a / 16b, N = 3 (each sensing bar contains 3 sensing electrodes), M = 3 (producing a total of 3 sensing bars), detection printed on the waterproof thin film. The number of electrodes = M * (N-1) + 1 = 3 * (3-1) + 1 = 7, and the number of slitting lines (number of directions) = M + 1 = 3 + 1 = 4. In practical applications, N may be any integer greater than 1, and the corresponding array of detection electrodes may not exceed the width of the waterproof thin film. When N = 1, the sensing bar includes one sensing electrode, and in this special case the sensing bar should be used in combination with the other sensing electrodes. When N> = 2, the sensing bar includes a plurality of detection electrodes and can be used independently. In practical applications, N is preferably 2-10, and M is set according to the width of the upper and lower waterproof thin film coil materials and the width of the slitted sensing bar.

Hereinafter, as shown in FIG. 18, the figure is a block diagram of the functional structure of the excrement sensor according to the embodiment of the present invention. In the figure, 10 is a disposable excrement transporting and absorbing device (disposable absorbent article / intelligent disposable diaper), 20 is a sensing bar installed on the intelligent disposable diaper, 30 is a detecting device, and electrical connection 24. Can be electrically connected to the detection electrode of the sensing bar 20 in the disposable diaper 10. Specifically, a contact electrode with a metal needle can be installed in the detection device 30, and during work, these metal needles penetrate the upper and lower waterproof thin films of the sensing bar 20 to detect the inside of the intermediate layer of the sensing bar thin film. It is electrically connected to the electrode.

The detection device 30 includes a capacitance detection unit 35, can monitor the capacitance value between the detection electrodes in the detection bar in real time, and realizes a function of detecting the stool state of the disposable diaper 10. In addition, the related excrement state information (including alarm information) is wirelessly transmitted by the wireless transmission unit 36.

The wireless status information 38 is received by the wireless reception and display device 50, and the wireless reception and display device 50 includes the wireless reception unit 51, and after receiving the related status information, the status display unit 52 performs status display / instruction. Alternatively, the status alarm unit 53 can perform an alarm prompt. In a practical application, a mobile phone or computer (eg, a tablet computer) may be used to act as a wireless reception and display device 50, obtaining relevant state information by the running App and then by a display. Perform a related status display or alarm prompt.

With the above configuration, the excrement sensor according to the embodiment of the present invention has signal sensing, signal detection, signal transmission, signal reception and signal display functions, and as a result, the embodiment of the present invention is the most basic passive thin film. It can evolve from a capacitance sensor to an active excrement sensor that includes a detection device, and further to a wireless excrement sensor that has transmit, receive, and display functions, i.e., excreta according to an embodiment of the invention. The sensor can have various representations.

Since what is disclosed above is only a preferred embodiment of the present invention and thereby cannot limit the scope of the claims of the present invention, the equivalent changes made in accordance with the claims of the present invention are still present. It belongs to the scope of the invention.

Claims (10)

An excrement sensor, including a thin film capacitance sensor, wherein the sensor includes a sensing bar, the sensing bar is an upper waterproof thin film, a lower waterproof thin film, a first detection electrode, a second detection electrode and a first. The upper and lower waterproof thin films are bonded to each other to form an insulating intermediate layer, and the main body portion of the first detection electrode is located in the intermediate layer, and the first detection electrode is formed. The notch penetrates the upper waterproof thin film, the lower waterproof thin film, and the first detection electrode located in the intermediate layer, and as a result, the first detection electrode in the intermediate layer has the first notch. It is exposed to the outside through the sensor to form a first sensing wire, and the first sensing wire comes into contact with the excrement to be detected to generate a first electric double layer capacitor, and the first electric double layer is formed. An excrement sensor characterized in that the capacitance of the capacitor is directly proportional to the coverage range of the excrement to be detected on the first sensing line. The main body portions of the first and second detection electrodes are located in the intermediate layers of the upper and lower waterproof thin films, and are separated and insulated from each other, and the sensing bar further includes a second notch. The second notch penetrates the upper waterproof thin film, the lower waterproof thin film, and the second detection electrode located in the intermediate layer, and as a result, the second detection electrode in the intermediate layer is the notch. It is exposed to the outside through the second sensing wire to form a second sensing wire, and the second sensing wire contacts the detection target excrement to generate a second electric double layer capacitor, and the second electric double layer is formed. The capacitance of the capacitor is directly proportional to the coverage range of the excrement to be detected on the second sensing line, and the capacitance between the first and second detection electrodes is the first and second electric doubles. The excrement sensor according to claim 1, wherein the value is a series connection value of a multi-layer capacitor. The second detection electrode is located on the outer surface of the upper waterproof thin film or the lower waterproof thin film, and is in direct contact with the excrement to be detected to generate a second electric double layer capacitor, and the second electric double layer is formed. The capacitance of the capacitor is directly proportional to the coverage range of the excrement to be detected on the second detection electrode, and the capacitance between the first and second detection electrodes is the first and second electric double layers. The excrement sensor according to claim 1, wherein the value is a series connection value of a multi-layer capacitor. The first and second notches penetrating the first and second detection electrodes include a linear open type notch, which are located at two edges of the sensing bar in the lateral direction, respectively, and the intermediate layer. The first and second detection electrodes inside are exposed to the outside through the first and second notches to form sensing lines parallel to each other, and the first or second detection electrode is sensing. The first notch comprising a break point in the longitudinal direction of the bar or penetrating the first detection electrode includes a dotted line concealed notch, and the concealed notch is in the center of the first detection electrode. The first and second notches forming a sensing line approaching and hidden in position or penetrating the first and second detection electrodes include a rectangular notch, the rectangular notch comprising the sensing bar. A linear sensing line is cut out from the first and second detection electrodes, or at least a part thereof overlaps with the first and second detection electrodes, or the first detection electrode is penetrated. The excrement sensor according to claim 2, wherein the first notch is a circular notch, and the circular notch approaches the central position of the first detection electrode and forms a circular sensing line. .. The sensing bar includes a third detection electrode, the third detection electrode is located in the intermediate layer of the upper and lower waterproof thin films, and is not in contact with the detection target excrement during work, and the third detection is performed. The electrode constitutes an electrolytic capacitor together with the sensing wire and the excrement to be detected in contact with the sensing wire, and the third detection electrode and the sensing wire constitute an electrode of the electrolytic capacitor, and the waterproof thin film is formed. Consists of the dielectric of the electrolytic capacitor, the excrement constitutes the electrolyte of the electrolytic capacitor, and the capacitance value of the electrolytic capacitor is the area corresponding to the third detection electrode of the excrement on the surface of the waterproof thin film. The excrement sensor according to claim 1, wherein the excrement sensor is directly proportional to. The first and second detection electrodes include a carbon electrode produced by carbon conductive ink printing, and the width of the sensor line exposed to the outside through a notch is the thickness of the conductive ink printing. Consistent with the above, the upper and lower waterproof thin films contain hydrophobic thin films and perform different surface actions on excrement with different viscosity, fluidity and adhesive force, thereby providing an excrement detection function that distinguishes stools. The excrement sensor according to claim 1, wherein the excrement sensor is realized. It includes a disposable excrement transport and absorption device, has the appearance design of a normal disposable absorbent article, and includes a surface layer, an absorption layer and a leak prevention layer, and the sensing bar absorbs on or with the surface layer. A disposable intelligent absorbent article that is installed between layers or between the absorption layer and the leakage prevention layer and can provide excrement state information of a specific layer together with the surface layer, the absorption layer and the leakage prevention layer. The excrement sensor according to claim 1, wherein the excrement sensor is configured. A detection device including a capacitance detection unit is further included, the capacitance detection device is electrically connected to the first and second detection electrodes, and a quantitative detection function of excrement is realized by capacitance detection. The excrement sensor according to claim 1, wherein the excrement sensor is provided. A wireless transmission unit and a wireless reception and display device may be further included to transmit, receive and display relevant excrement status information or alarm information, said wireless reception and display device including a mobile phone or tablet computer. The excrement sensor according to claim 8, wherein the excrement sensor is characterized. It is a method for manufacturing an excrement sensor, which is suitable for mass production of an excrement sensor of M volume, and each volume includes a detection bar according to claim 1 of a detection electrode.
A step of installing M * (N-1) + 1 parallel detection electrodes by carbon conductive ink printing on any surface of a wide range of upper and lower waterproof thin film coil materials.
By adhering an arbitrary surface of the other wide waterproof thin film coil material on which the detection electrode is not installed to a wide range of waterproof thin film coil material on which the detection electrode is installed, one wide composite film coil material is generated, and the detection electrode Is a step located in the intermediate layer of the wide composite film coil material,
The wide composite film coil material is slit in the M + 1 direction, and the detection electrode and the corresponding upper and lower waterproof thin film are cut at a position near the center of the detection electrode to open M + 1 straight lines. By generating a notch, an M-roll sensing bar coil material is generated, and each winding sensing bar coil material includes N detection electrodes, with a first detection electrode and a second detection electrode (N> = 2). (If there is) is located on both sides of the sensing bar and includes a first notch and a second notch, respectively, forming a linear sensing line in the first and second notches, and the other. A method for manufacturing an excrement sensor, wherein the main body portion of the detection electrode (when N> = 3) includes a step that does not include any notch and a sensing line.