Diaper / pants water wetting radio frequency sensor and disposable diaper / pants

Abstract

The utility model discloses a disposable diaper / pants water-wet radio frequency sensor in the technical field of radio frequency sensors. The disposable diaper / pants water-wet radio frequency sensor comprises a radio frequency tag body layer, sodium chloride salt fine particles located at a resonant cavity position of a radio frequency tag, a tag water absorption layer and a moisture-proof protective film. The disposable diaper / pants water-wet radio frequency sensor after the moisture-proof protective film is uncovered is located in the disposable diaper / pants, and a label water absorption layer of the disposable diaper / pants water-wet radio frequency sensor faces the inner side of the disposable diaper / pants body. The disposable diaper / pants have the water wetting reminding function and are high in safety, low in cost and easy to apply and popularize.

Description

TECHNICAL FIELD

[0001] The utility model relates to radio frequency sensor technical field, specifically, it is related to a kind of paper diaper / trousers water wet radio frequency sensor and application. BACKGROUND

[0002] Paper diaper or paper diaper trousers have been widely applied in bedridden old people or baby crowd.If paper diaper (trousers) is wet, it cannot be replaced in time, and it can cause bedsores to old people or baby skin.Now, paper diaper or paper diaper trousers are checked by people actively, and it is inevitable that there are not timely checking time.

[0003] Therefore, a water wet sensor for paper diaper or paper diaper trousers is needed urgently, which can notify medical staff or family members to replace paper diaper or paper diaper trousers in time. UTILITY MODEL CONTENT

[0004] In order to overcome the shortcomings of the prior art, the utility model provides a kind of paper diaper / trousers water wet radio frequency sensor and application.

[0005] The utility model technical scheme is as follows:

[0006] The utility model provides a kind of paper diaper / trousers water wet radio frequency sensor, including radio frequency tag body layer, sodium chloride salt fine particle, label water absorption layer and moisture-proof protective film.Label water absorption layer is 0.1 millimeter~0.3 millimeter thick water absorption paper, and moisture-proof protective film is 15 microns~25 microns thick PP protective film.

[0007] Radio frequency tag body layer includes PET bottom film, radio frequency resonant cavity, ultra-high frequency antenna, radio frequency chip and pressure sensitive adhesive layer, radio frequency resonant cavity is located on the surface of PET bottom film, and ultra-high frequency antenna, radio frequency chip are connected with radio frequency resonant cavity to form radio frequency resonant cavity assembly, and pressure sensitive adhesive layer connects PET bottom film and label water absorption layer.

[0008] The utility model also provides a kind of paper diaper / trousers, including paper diaper / trousers body, paper diaper / trousers water wet radio frequency sensor after moisture-proof protective film is removed is located inside paper diaper / trousers body, and the label water absorption layer of paper diaper / trousers water wet radio frequency sensor is towards the inside of paper diaper / trousers body.

[0009] According to the utility model of the above-mentioned scheme, its beneficial effect lies in, the utility model can make that paper diaper / trousers realizes water wet reminding function, so as to be replaced in time paper diaper / trousers.The paper diaper / trousers water wet radio frequency sensor of the utility model is hidden in paper diaper / trousers, does not directly contact with human body, so that the wearing comfort of paper diaper / trousers is better, and the utility model adopts radio frequency technology instead of electric signal, guarantees the safety of human body, and signal acquisition is more rapid, and reaction is more sensitive.

[0010] The paper diaper / trousers water wet radio frequency sensor is more quick to install, can be realized without changing the structure of the existing paper diaper / trousers, is low in cost and easy to popularize and apply. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1a It is a structure schematic view of the paper diaper / trousers water wet radio frequency sensor of the aluminum foil etching ultra-high frequency antenna in the utility model;

[0012] Figure 1b It is a top view of the paper diaper / trousers water wet radio frequency sensor of the aluminum foil etching ultra-high frequency antenna in the utility model;

[0013] Figure 1c It is a schematic view of the radio frequency tag of the aluminum foil etching ultra-high frequency antenna in the utility model;

[0014] Figure 2a It is a structure schematic view of the paper diaper / trousers water wet radio frequency sensor of the copper wire ultra-high frequency antenna in the utility model;

[0015] Figure 2b It is a schematic view of the radio frequency tag of the copper wire ultra-high frequency antenna in the utility model;

[0016] Figure 2c It is a structure schematic view of the double-circle type radio frequency resonant cavity in the utility model;

[0017] Figure 3 It is a schematic view of the paper diaper / trousers water wet radio frequency sensor of the puncture needle front end hole insertion in the utility model;

[0018] Figure 4 It is a schematic view of the paper diaper / trousers water wet radio frequency sensor of the puncture method installation in the utility model;

[0019] Figure 5 It is an application state schematic view of the paper diaper / trousers water wet radio frequency sensor in the utility model.

[0020] In the drawings, various reference numerals are:

[0021] 01, paper diaper / trousers water wet radio frequency sensor; 021, paper diaper / trousers inner layer water permeable film; 022, paper diaper / trousers inner part; 023, paper diaper / trousers outer layer waterproof film; 03, bed; 04, radio frequency identification alarm;

[0022] 1, fine particle of sodium chloride salt; 2, pressure sensitive adhesive layer; 3, label water absorption layer;

[0023] 11, aluminum foil etching antenna PET bottom film; 12, aluminum foil etching ultra-high frequency antenna; 13, radio frequency chip; 14, moisture-proof protective film;

[0024] 21. Copper wire antenna PET base film; 22. Copper wire UHF antenna; 23. Dual-loop RF resonant cavity; 231. Inner ring aluminum foil; 232. Outer ring aluminum foil; 233. Chip coupling point; 234. Antenna coupling point;

[0025] 31. Puncture needle; 32. Puncture needle tip; 33. Puncture needle front hole. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0027] like Figures 1a to 2b As shown, this utility model provides a diaper / pants wetness radio frequency sensor, which uses ultra-high frequency radio frequency signals as transmission signals to promptly remind people to change the diaper / pants when they become wet.

[0028] The diaper / pants moisture radio frequency sensor includes an RFID tag body layer, sodium chloride fine particles 1, a tag absorbent layer 3, and a moisture-proof protective film 14. The RFID tag body layer provides basic radio frequency functions, the sodium chloride fine particles 1 are used to control the radio frequency signal according to the moisture level, the tag absorbent layer 3 is used for water absorption, and the moisture-proof protective film 14 can prevent the sodium chloride fine particles 2 from getting damp.

[0029] 1. Radio Frequency Tag Body Layer

[0030] The RFID tag body layer is used to transmit and receive radio frequency signals. Its overall shape is long and narrow, which makes the RFID tag small in size and increases the transmission distance of radio frequency signals while ensuring signal sensitivity.

[0031] The RFID tag body includes a PET base film, an ultra-high frequency antenna, an RFID resonant cavity, an RFID chip 13, and a pressure-sensitive adhesive layer 2. The RFID resonant cavity is located on the surface of the PET base film. The ultra-high frequency antenna and the RFID chip 12 are both connected to the RFID resonant cavity to form an RFID resonant cavity assembly. The pressure-sensitive adhesive layer 2 is used to connect the PET base film and the tag absorbent layer 3.

[0032] In this invention, the UHF channel is located between 860MHz and 960MHz, and the UHF antenna can be an aluminum foil etched UHF antenna or a copper wire UHF antenna.

[0033] (1) Aluminum foil etched ultra-high frequency antenna

[0034] like Figures 1a to 1c As shown, both the radio frequency resonant cavity and the aluminum foil-etched ultra-high frequency antenna 12 are formed by etching the aluminum foil of the PET substrate. Specifically, the surface of the PET substrate 11 for the aluminum foil-etched antenna is provided with an aluminum foil layer, which is etched to form the radio frequency resonant cavity and the aluminum foil-etched ultra-high frequency antenna 12. Figure 1cAs shown, the radio frequency resonant cavity is a ring circuit with an opening. The radio frequency chip 13 is connected to the chip coupling position of the ring circuit. One side of the ring circuit opposite to the radio frequency chip 13 extends to the left and right to form antenna fins (i.e., aluminum foil etched ultra-high frequency antenna 12) to enhance the radio frequency signal strength.

[0035] In this configuration, the pressure-sensitive adhesive layer 2 is located on the surface of the RF chip 12, connected to the aluminum foil etched antenna PET substrate 11, and serves to enclose the RF chip 13 and the aluminum foil etched ultra-high frequency antenna 12 between the pressure-sensitive adhesive layer 2 and the aluminum foil etched antenna PET substrate 11. Fine sodium chloride particles 1 are located between the pressure-sensitive adhesive layer 2 and the RF resonant cavity (aluminum foil etched ultra-high frequency antenna 12), allowing the pressure-sensitive adhesive layer 2 to connect to the aluminum foil etched antenna PET substrate 11 while simultaneously encapsulating the fine sodium chloride particles 1.

[0036] (2) Copper wire UHF antenna

[0037] like Figures 2a to 2c As shown, the copper wire UHF antenna 22 is formed by bending copper wire, and the copper wire is connected to the antenna coupling position 234 of the dual-loop RF resonant cavity 23 to realize the function of antenna data transmission. Specifically, the dual-loop RF resonant cavity 12 and the copper wire UHF antenna 22 are bonded to the pressure-sensitive adhesive layer 2, and the sodium chloride fine particles 1 are located at the position of the dual-loop RF resonant cavity 12.

[0038] In this method, the pressure-sensitive adhesive layer 2 is located below the dual-loop RF resonant cavity 23 and the copper wire UHF antenna 22, which can simultaneously adhere the dual-loop RF resonant cavity 23, the copper wire UHF antenna 22, and the sodium chloride fine particles 1 to their surfaces, thus fixing the three together. Another pressure-sensitive adhesive layer is also provided above the dual-loop RF resonant cavity 23, the copper wire UHF antenna 22, and the sodium chloride fine particles 1. The label absorbent layer 3 is located on the surfaces of the dual-loop RF resonant cavity 23, the copper wire UHF antenna 22, and the sodium chloride fine particles 1, connecting them and simultaneously bonding the label absorbent layer.

[0039] Preferably, the copper wire diameter is 0.05 mm to 0.08 mm, and the resistance per meter of copper wire is less than 7.5 ohms. The shape of the copper wire UHF antenna 22 can be linear, sinusoidal, square, triangular, trapezoidal, serrated, or mixed. A mixed waveform refers to a shape formed by connecting any two or more of the above shapes, such as a segment of linear, a segment of sinusoidal, and so on.

[0040] In the embodiment, the double-loop radio frequency resonant cavity 23 comprises an inner loop aluminum foil 231 and an outer loop aluminum foil 232 formed by aluminum foil etching, the openings of the inner loop aluminum foil 231 and the outer loop aluminum foil 232 are located at one place to form a chip coupling site 233 for connecting with the radio frequency chip 13, and the outer loop aluminum foil 232 on the side opposite to the installation position of the radio frequency chip 13 is provided with an antenna coupling site 234 for coupling with the copper wire ultra-high frequency antenna 22. Meanwhile, the packaging pins of the radio frequency chip 13 comprise two packaging balance pins and two packaging pins, and the two packaging balance pins are connected through a short circuit line. One packaging balance pin is connected with one end point of the inner loop aluminum foil 231, the other packaging balance pin is connected with one end point of the outer loop aluminum foil 232, one packaging pin is connected with the other end point of the inner loop aluminum foil 231, and the other packaging pin is connected with the other end point of the outer loop aluminum foil 232. The radio frequency chip 13 is fixed on the end points of the double-loop radio frequency resonant cavity 23 through conductive resin, the inner loop aluminum foil and the outer loop aluminum foil are connected in series through the short circuit line between the packaging balance pins, and the two packaging pins of the radio frequency chip 13 and the inductance of the series connection of the inner loop aluminum foil and the outer loop aluminum foil form the double-loop radio frequency resonant cavity assembly.

[0041] 2. Sodium chloride salt fine particles

[0042] The sodium chloride salt fine particles 1 are arranged in the radio frequency tag body layer and located at the resonant cavity site of the radio frequency tag, so that the state change of the sodium chloride salt fine particles 1 can directly affect the radio frequency performance of the radio frequency resonant cavity. In addition, the sodium chloride salt fine particles 1 have low cost and will not cause damage to the human body.

[0043] 3. Label water absorption layer

[0044] The label water absorption layer 3 is located on the surface of the radio frequency tag body layer and connected with the pressure-sensitive adhesive layer 2 of the radio frequency tag body layer to realize fixation and cover the sodium chloride salt fine particles 1. The sodium chloride salt fine particles 1 are directly contacted with the label water absorption layer 3, so that the state of the sodium chloride salt fine particles 1 is changed according to the water wetness of the label water absorption layer 3.

[0045] The label water absorption layer 3 of the utility model adopts the water absorption paper with the thickness of 0.1mm-0.3mm.

[0046] 4. Moisture-proof protective film

[0047] The moisture-proof protective film 14 is located on the surface of the label water absorption layer 3, and the moisture-proof protective film 14 needs to be torn off when the paper diaper / trouser water wet radio frequency sensor is used. The moisture-proof protective film 14 adopts the PP protective film with the thickness of 15-25 microns, which is covered on the surface of the label water absorption layer 3, so that the sodium chloride salt fine particles are prevented from being damp in the wet weather.

[0048] As Figure 3As shown, the utility model also provides a kind of paper diaper / trousers of application paper diaper / trousers water wet radio frequency sensor, including paper diaper / trousers body, the inside of paper diaper / trousers body is paper diaper / trousers inner layer water permeable membrane 021, and its outside is paper diaper / trousers outer layer waterproof film 022.

[0049] The paper diaper / trousers water wet radio frequency sensor after removing moisture-proof protective film is located inside paper diaper / trousers 022, and the label water absorption layer of paper diaper / trousers water wet radio frequency sensor is towards the inside of paper diaper / trousers body, so that the label water absorption layer can detect water wet as soon as possible to carry out radio frequency response.

[0050] The paper diaper / trousers water wet radio frequency sensor after removing moisture-proof protective film is inserted into the inside of paper diaper / trousers body by puncture needle 31, the front end of puncture needle 31 is provided with puncture needle tip 32, the rear side of puncture needle tip 32 is provided with puncture needle front end hole 33, when installing, paper diaper / trousers water wet radio frequency sensor 01 is first inserted through puncture needle front end hole 33, and paper diaper / trousers water wet radio frequency sensor 01 is driven into the inside of paper diaper / trousers 022 by puncture needle 31.

[0051] As shown in Figure 3 , Figure 4 The installation method of paper diaper / trousers water wet radio frequency sensor includes the following steps:

[0052] 1, remove the moisture-proof protective film on the surface of paper diaper / trousers water wet radio frequency sensor 01.

[0053] 2, one end of paper diaper / trousers water wet radio frequency sensor 01 is inserted into the puncture needle front end hole of puncture needle tip 32.

[0054] 3, insert puncture needle 31 into the inside of the front end of paper diaper / trousers body (one side of paper diaper / trousers inner layer water permeable membrane 021), and after confirming that the label water absorption layer of paper diaper / trousers water wet radio frequency sensor 01 is towards the inside of paper diaper / trousers body, push forward puncture needle 31 (the pushing distance is about 80 millimeters according to the length of paper diaper / trousers water wet radio frequency sensor 01), so that paper diaper / trousers water wet radio frequency sensor 01 is synchronized forward and inserted into paper diaper / trousers body.

[0055] 4, hold the tail end of paper diaper / trousers water wet radio frequency sensor 01 (right side in Figure 3 ), continue to push forward puncture needle 31 (the pushing distance is about 20 millimeters to 30 millimeters according to the length of paper diaper / trousers water wet radio frequency sensor 01 inserted into puncture needle front end hole 33), until the front end of paper diaper / trousers water wet radio frequency sensor 01 leaves puncture needle front end hole 33.

[0056] 5, pull out puncture needle 31, so that paper diaper / trousers water wet radio frequency sensor 01 remains in paper diaper / trousers body.

[0057] After being installed and worn on the human body, the paper diaper / trousers wet radio frequency sensor is used in combination with the radio frequency identification alarm 04 located below the bed 03, and the radio frequency identification alarm 04 cannot receive the signal after the paper diaper / trousers wet radio frequency sensor 01 is wet, the radio frequency identification alarm 04 sends alarm information to the sound and light display, and the sound and light display in the hall or the on-duty room performs sound and light alarm to remind others to replace the paper diaper / trousers wet.

[0058] After the installation of the paper diaper / trousers wet radio frequency sensor is completed, the sensor can also be checked, and the specific steps are as follows:

[0059] 1. Place the paper diaper / trousers in the middle part of the bed 03, so that it corresponds to the position when the human body lies flat or lies on one side.

[0060] 2. Turn on the power of the radio frequency identification alarm 04, the radio frequency identification alarm 04 green light, display its normal work, and can read the radio frequency signal of the paper diaper / trousers wet radio frequency sensor 01, so as to show that the paper diaper / trousers is not wet.

[0061] 3. Cover the paper diaper / trousers wet radio frequency sensor 01 with both hands, so that the sensitivity of the radio frequency tag is greatly reduced, or hold the paper diaper / trousers above 40 cm, so that the radio frequency signal is difficult to be read by the radio frequency identification alarm 04, so as to show that the radio frequency tag is invalid, indicating that the paper diaper / trousers is wet. At this time, since the radio frequency identification alarm 04 cannot read the radio frequency signal of the paper diaper / trousers wet radio frequency sensor 01, it generates an alarm signal.

[0062] If the alarm occurs, it indicates that the paper diaper / trousers wet radio frequency sensor 01 can work normally.

[0063] The working principle of the paper diaper / trousers wet radio frequency sensor in the utility model is as follows:

[0064] 1) The dielectric constant of the radio frequency resonant cavity part in the paper diaper / trousers wet radio frequency sensor determines the reading sensitivity of the radio frequency tag. When the sodium chloride salt substance is in a solid state, the dielectric constant is small, and when it is in the radio frequency resonant cavity part, the solid sodium chloride salt has little effect on the reading sensitivity of the radio frequency tag, and the radio frequency tag can work normally. When the sodium chloride salt substance is wet and changes from a solid to a liquid, it has a conductive property, and the dielectric constant increases greatly, and when it is in the radio frequency resonant cavity part, the liquid sodium chloride salt greatly reduces the reading sensitivity of the radio frequency tag, and loses the radio frequency function.

[0065] 2) due to the radio frequency tag function failure of the paper diaper / trousers wet radio frequency sensor, the radio frequency reader (i.e. the radio frequency identification alarm under the bed) cannot read the radio frequency signal, its output changes from low level to high level, and the alarm signal is triggered; meanwhile, it can also be linked with the sound and light display in the hall or the on-duty room to make sound and light alarm, reminding people to change the paper diaper / trousers.

[0066] In the normal use process: after the child or the old man or the paralytic patient wears the paper diaper / trousers, if the paper diaper / trousers is wet, the moisture enters the position of the radio frequency resonant cavity through the label water absorption layer, the sodium chloride salt fine particles are dissolved, the dielectric constant of the sodium chloride solution is greatly increased, the sensitivity of the radio frequency tag is greatly reduced and fails, no radio frequency signal or the radio frequency signal cannot be recognized by the radio frequency identification alarm 04, and then the high level output triggers the alarm signal.

[0067] The paper diaper / trousers wet radio frequency sensor in the utility model has the following functional characteristics of the paper diaper / trousers:

[0068] (1) the paper diaper / trousers wet radio frequency sensor is located in the paper diaper / trousers body, and does not directly contact with people, so that the comfort is good.

[0069] (2) the paper diaper / trousers wet radio frequency sensor does not need power supply, has no wire arrangement, and has no current passing, so that the safety is good.

[0070] (3) the paper diaper / trousers wet radio frequency sensor is more convenient and fast to install on the paper diaper / trousers body.

[0071] (4) the response speed of the paper diaper / trousers wet radio frequency sensor is fast, and the alarm signal output can be realized within three minutes.

[0072] (5) the paper diaper / trousers wet radio frequency sensor has small overall volume, low cost, and is easy to be widely popularized and applied.

[0073] (6) the existing structure of the paper diaper / trousers can not be changed, and the paper diaper / trousers wet radio frequency sensor can be directly installed.

Claims

1. A radio frequency sensor for the moisture content of diapers / pants, characterized in that, include: The RFID tag body layer is used to transmit and receive radio frequency signals; Fine sodium chloride particles are disposed within the body layer of the RFID tag and located in the resonant cavity of the RFID tag, so that changes in the state of the fine sodium chloride particles directly affect the RF performance of the RF resonant cavity. A label absorbent layer is located on the surface of the RFID tag body layer, and the label absorbent layer is absorbent paper. And a moisture-proof protective film, which is located on the surface of the label's absorbent layer to prevent fine sodium chloride particles from getting damp; The RFID tag body layer includes a PET base film, an RF resonant cavity, an UHF antenna, an RF chip, and a pressure-sensitive adhesive layer. The RF resonant cavity is located on the surface of the PET base film. The UHF antenna and the RF chip are both connected to the RF resonant cavity to form an RF resonant cavity assembly. The RF resonant cavity is a ring circuit with an opening. The RF chip is connected to the chip coupling position of the ring circuit. The pressure-sensitive adhesive layer is used to connect the PET base film and the tag absorbent layer. Fine sodium chloride particles are located between the pressure-sensitive adhesive layer and the RF resonant cavity, so that the pressure-sensitive adhesive layer can be sealed with fine sodium chloride particles while connecting the aluminum foil-etched antenna PET base film. The UHF antenna is formed by bending copper wire, and the copper wire is pasted on the inner side of the pressure-sensitive adhesive layer and coupled to the antenna coupling position of the RF resonant cavity.

2. The diaper / pants moisture radio frequency sensor according to claim 1, characterized in that, The surface of the PET base film is provided with an aluminum foil layer, and the aluminum foil layer is etched to form the ultra-high frequency antenna and the radio frequency resonant cavity.

3. The diaper / pants moisture radio frequency sensor according to claim 1, characterized in that, The thickness of the absorbent paper is 0.1 mm to 0.3 mm.

4. The diaper / pants moisture radio frequency sensor according to claim 1, characterized in that, The thickness of the moisture-proof protective film is 15 micrometers to 25 micrometers.

5. A diaper / pants using the diaper / pants moisture radio frequency sensor according to any one of claims 1-4, characterized in that, The diaper / pants body includes a moisture-proof protective film removed from the diaper / pants body. The moisture-proof protective film of the diaper / pants body is removed from the diaper / pants body and the absorbent layer of the label of the moisture-proof protective film of the diaper / pants body faces the inside of the diaper / pants body.

6. The diaper / pants according to claim 5, characterized in that, After the moisture-proof protective film is removed, the diaper / pants moisture radio frequency sensor is inserted into the interior of the diaper / pants body through a puncture needle.

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