KR101670788B1

KR101670788B1 - Insole for collecting foot pressure

Info

Publication number: KR101670788B1
Application number: KR1020150102823A
Authority: KR
Inventors: 김백진; 고철웅; 한세미; 변태민
Original assignee: 한국생산기술연구원
Priority date: 2015-07-21
Filing date: 2015-07-21
Publication date: 2016-10-31

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a shoe insole, and more particularly, to a shoe insole for foot pressure collection including a sensor including a plurality of conductive contacts in a sensor base layer of an impact absorbing material.
The foot pressure collecting insole according to the present invention has excellent durability, and it is possible to collect accurate foot pressure data as the error range of data collection is reduced.

Description

Insole for collecting foot pressure

The present invention relates to a shoe insole, and more particularly, to a shoe insole capable of accurately measuring foot pressure of a pedestrian by including a sensor including a plurality of conductive contacts on a sensor base layer of an impact absorbing material.

The shoes are designed to prevent foot protection, fashion, and slip on the floor. The types include sneakers, fashion shoes, slippers, etc., and the insole is provided inside the shoe to mitigate impact transmitted from the floor or outside .

As described above, the conventional insole provided for the purpose of impact mitigation is manufactured by adopting a silicon material. Korean Patent No. 10-1333728, for example, discloses a feature that it is disposed inside a shoe so as to be in close contact with a bottom surface of a wearer's foot to mitigate impact and prevent slippage. However, in the case of a silicone material applied to a conventional shoe insole, the weight is heavy and the adhesiveness is poor. In addition, there is a limitation in applying the silicon material to the entire surface of the insole with a large manufacturing cost, and in order to solve such a problem, there is a focus on technology for manufacturing by applying a polyurethane material.

People walk a lot in their everyday lives, and each time they walk a distance of about 1 Km, they get about 10-20 tons of pressure. In addition, inherited foot disease, lack of exercise, walking habits, etc., will lead to foot related diseases.

Accordingly, since the walking posture of a person is directly related to the health of the person, it is important to have a proper walking posture. However, the majority of people do not have the correct walking postures when walking, and the impacts on the right foot and left foot are abnormally different, which may adversely affect the health of the pedestrian, so it is necessary to correct the walking posture.

Recently, in order to analyze the walking posture of a pedestrian, as shown in Korean Patent No. 10-1263216, a sensor is attached to a shoe insole to extract the walking data, thereby providing the most suitable health related service to the pedestrian. However, it is difficult to analyze the accurate walking posture by analyzing based on the walking data extracted within a certain time in a certain space, because the sensor applied to analyze the walking posture of the existing pedestrian is not economical due to the high price, .

In the case of the insole equipped with the sensor for the analysis of the walking posture of the pedestrian, the conventional silicone material was replaced with the polyurethane material. However, when the polyurethane material having poor durability was used, the number of compression and elastic restoration was increased A deformation of the polyurethane insole shape occurs. Therefore, as the pedestrian feels uncomfortable and comfortable walking, it is difficult to collect accurate data, and the problem arises that the cost due to replacement of the insole is generated.

Korean Patent No. 10-1333728 Korean Patent No. 10-1263216

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems of the prior art, and it is an object of the present invention to provide a polyurethane foam containing 40 to 60% of foamed foam cells having a particle size of 40 to 60 탆, So that it is possible to collect accurate foot pressure data.

In order to achieve the above object,

A sensor base layer comprising foamed polyurethane; And

And a plurality of sensors provided in the sensor base layer,

The foamed polyurethane provides an insole collecting insole containing a foamed foam cell having a particle size of 40 to 60 mu m in a range of 40 to 60% of the entire foamed foam cells.

As the foot pressure collecting insole according to the present invention is applied to the insole with a polyurethane material having excellent durability, it is possible to acquire precise foot pressure and the additional replacement cost of the insole is reduced.

Accordingly, the present invention can be applied to an insole provided with a sensor, thereby providing a customized health-related service such as measurement of an activity amount of a pedestrian and confirmation of pathology.

1 is a perspective view of a foot pressure collecting insole according to the present invention.
FIG. 2 is a perspective view of a sensor provided in a foot pressure collecting insole according to the present invention. FIG.
Fig. 3 is a morphological analysis graph of Example 1 of the present invention and Comparative Examples 1 to 4. Fig.
4 is a graph showing the results of permanent compression shrinkage measurement of Example 1 of the present invention and Comparative Examples 1 to 4;
5 is a graph showing the results of the repulsive force measurement of Example 1 and Comparative Examples 1 to 4 of the present invention.
6 is a graph showing the durability measurement results of Example 1 of the present invention.
FIG. 7 is a graph showing an optical microscope photograph and a cell distribution chart of a permanent compression shrinkage test according to Example 1 of the present invention. FIG.

Hereinafter, the present invention will be described in more detail.

The present invention proposes an insole (1) for foot pressure collection that can accurately collect foot pressure data of a pedestrian.

The foot pressure collecting insole 1 according to an embodiment of the present invention includes a sensor base layer 10 using a foamed polyurethane material and a plurality of sensors 20 provided in the sensor base layer 10.

The sensor base layer 10 is a base component constituting the footrest collecting insole 1, and alleviates an impact that a pedestrian is transmitted from the floor to the foot when walking.

Particularly, the foamed polyurethane according to the present invention is characterized in that the foamed foam cell having a particle size of 40 to 60 탆 is contained in a range of 40 to 60% of all the foamed foam cells, thereby exhibiting an excellent compression reduction ratio and excellent resilience property .

When the foamed foam cell having a particle size of 40 to 60 탆 is contained in less than 40% of all the foamed foam cells, there is a problem that the foamed foamed cell can not be recovered when the foamed foam is compressed due to a certain pressure, The effects of the permanent compressive shrinkage and the rebound resilience on the physical properties are insignificant.

The polyurethane foam according to the present invention has a low degree of deformation of the material of the polyurethane foam foam even though the number of repulsion elasticity after compression due to pressure increases due to excellent permanent compression shrinkage and rebound resilience property, .

It is preferable that the foamed foam having a particle size of 40 to 60 탆 has 50 to 300 cells per unit area, and the unit area is 1 to 3 mm 2.

As described above, the sensor base layer 10 of the present invention including the polyurethane foam foam having improved durability can reduce the error range when collecting the foot pressure data, and accurate foot pressure collection becomes possible.

The polyurethane foamed foam is preferably prepared by polymerizing an isocyanate with a polyol obtained by mixing an ether type polyol and a caprolactone type polyol. At this time, the isocyanate is methylenediphenyl isocyanate (MDI).

The polyurethane foamed foam is characterized in that the equivalent ratio (NCO / OH) of the isocyanate group and the hydroxyl group of the polyol is in the range of 1 to 3. If the equivalent ratio of the isocyanate group to the hydroxyl group is less than the above range, the physical properties of the polyurethane foam foam are generally deteriorated. If the equivalent ratio is more than the above range, the hardness of the elastomer of the polyurethane foam foam is improved, This is because a problem of breakage may occur.

A plurality of the sensors 20 of the present invention are provided in the sensor base layer 10.

The sensor 20 is not particularly limited in the present invention, but preferably includes a silicone material. More preferably, the sensor 20 is made of silicon having a permanent compression shrinkage and rebound resilience similar to that of the polyurethane foam foam. It is good to include.

The pedestrian places the footfall collecting insoles 1 equipped with the sensor 20 at the predetermined intervals in the sensor base layer 10 in the inside of the shoe. The sensor base layer 10 undergoes a certain compressive deformation as a constant pressure is applied to the insole due to the weight of the pedestrian when walking, and the repulsive elasticity recovery that tries to return to the original shape occurs when the applied pressure is removed.

In this case, when the polyurethane foam foam applied as the material of the sensor base layer 10 and the sensor 20 positioned at a certain distance have different permanent compressive shrinkage and rebound resilience properties, The rebound resilience is changed so that the footwear insole (1) does not have a flat surface. For example, when the permanent compression shrinkage of the polyurethane foamed foam is higher than that of the sensor 20, the foamed polyurethane foamed foam is more compressed than the sensor 20 to feel a foreign body around the sensor 20 When the compression ratio of the polyurethane foam is lower than that of the sensor 20, the degree of compressive deformation of the foamed polyurethane foam is less than that of the sensor 20, A feeling of indentation is received.

Therefore, it is preferable that the material of the polyurethane foam foam applied to the foot pressure collecting insole 1 and the material of the sensor 20 is made of a material having a similar property of compression shrinkage and rebound resilience to each other, The permanent compression shrinkage and rebound resilience values of silicon contained in the material of the sensor 20 should be within about 15% of the permanent compression shrinkage and rebound resilience values of the polyurethane foam foam.

In addition, the sensor 20 according to the present invention may include a plurality of the conductive contacts 200. The foot pressure collecting insole (1) of the present invention collects foot pressure data for analyzing a walking posture of a pedestrian. The collection of the foot pressure data is performed by sensing the foot pressure from the sensor 20 provided in the sensor base layer 10 and collecting the data and the collected data is provided on one side of the foot pressure collecting insoles 1 To the circuit. In this case, since the sensor 20 and the circuit are in contact with each other to transmit the collected data to the circuit, the sensor 20 preferably includes a conductive material.

The conductive contact 200 according to the present invention is not limited, but one selected from the group consisting of carbon, metal and graphene is mixed with silicon.

Thus, the data received from the sensor 20 can receive pedestrian footing data through wireless devices such as wired or Wi-Fi. In this case, the method and apparatus for receiving the footpad data are not limited. For example, a pedestrian can easily receive his footpad data and receive a service. Receive and analyze personalized health-related services.

Hereinafter, preferred embodiments and experimental examples of the present invention will be described. The following examples and experimental examples are provided for the purpose of more clearly expressing the present invention, but the present invention is not limited to the following examples and experimental examples.

Example 1

In order to select a material suitable for the foot pressure collecting insole of the present invention, a polyol mixed with an ether-based polyol and a caprolactone-based polyol was mixed with MDI, and an amine catalyst was added to the poly Urethane was used to measure the physical properties. Among them, a morphological analysis was carried out by adopting a polyurethane foamed foam containing 41% of foamed cells having a particle size of 40 to 60 μm in the total polyurethane foamed cells included in an area of 2.5 mm 2, (IHF-B20 product of Duraceltec) (Example 1)

Comparative Example 1 to 4

Of the total polyurethane foamed foam cells contained in an area of 2.5 mm < 2 >, the 'PORON' product containing foamed foam having a particle size of 40 to 60 μm in a range of less than 40% and the polyurethane foamed foam Respectively. In the case of Comparative Example 1, foaming having a particle size of 40 to 60 탆 in 16% of all foamed foam cells, 13% in Comparative Example 2, 29% in Comparative Example 3 and 21% The results are shown in Table 1 and FIG. 3. (Comparative Example 1: PORON product, Comparative Example 2: FLUF-P25 product of Duraceltec Co., Ltd.) , Comparative Example 3: LRS-P20 product of Duraceltec, Comparative Example 4: CRS20 product of Duraceltec)

Foamed foam cell
Particle size Example 1
(IHF-B20) Comparative Example 1
(PORON) Comparative Example 2
(FLF-P25) Comparative Example 3
(LRS-P20) Comparative Example 4
(CRS0) 0 to 20 μm 0.58% - - - - 20 to 40 탆 22.38% 15.35% 9.36% 14.69% 6.86% 40 to 60 탆 41.38% 16.49% 13.48% 29.38% 21.08% 60 to 80 탆 22.41% 23.91% 10.87% 23.73% 22.30% 80 to 100 탆 6.2% 18.47% 15.36% 13.56% 19.12% 100 to 120 탆 1.03% 8.3% 18.73% 9.79% 16.42% 120 to 140 탆 0.2% 6.06% 10.87% 4.33% 7.60% 140 to 160 탆 - 5.95% 10.85% 3.01% 4.41% 160 to 180 탆 - 4.87% 7.87% 1.51% 1.12% 180 to 200 탆 - 0.3% 1.12% - 0.59% 200 to 220 탆 - 0.3% 1.49% - 0.49%

Experimental Example 1: permanent compression Abbreviation

The permanent compression shrinkage of Example 1 and Comparative Examples 1 to 4 according to the present invention was measured and the results are shown in Table 2 and FIG. The permanent compressive shrinkage test was conducted by the Korean Institute of Clothing and Textiles. The test specimens were tested under ASTM D 3574: 2011, and the test conditions were 50% compression for 22 hours at 70 ° C.

<Korea Apparel Testing Institute - Permanent Compression Ratio> Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Primary 1.68% 3.81% 6.51% 2.04% 2.48% Secondary 1.79% 4.68% 7.02% 1.84% 2.54% Third 2.19% 4.55% 4.89% 1.71% 2.40% Fourth 2.14% 2.68% 5.11% 1.89% 2.93% 5th 2.22% 5.60% 4.86% 2.04% 2.82% Average 2.00% 4.26% 5.68% 1.90% 2.63%

As shown in Table 2 and FIG. 4, it can be seen that the permanent compression shrinkage of Example 1 according to the present invention is better than that of Comparative Examples 1 to 2 and 4.

Experimental Example 2: Repulsive elasticity test

The rebound resilience of Example 1 and Comparative Examples 1 to 4 according to the present invention was measured and the results are shown in Table 3 and FIG. At this time, the test standard of the rebound resilience was ASTM D 2632, the test was carried out at a height of 40 cm.

Example 1 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Primary 80% 90% 26% 7% 15% Secondary 79% 90% 29% 5% 17% Third 81% 93% 30% 6% 14% Fourth 82% 88% 27% 5% 14% 5th 80% 92% 28% 5% 15% Average 80% 91% 28% 6% 15%

As shown in Table 3 and FIG. 5, in the case of Example 1 polyurethane foamed foam containing 41% of all foamed foam cells with foamed polyurethane foamed cells having a particle size of 40 to 60 μm, Comparative Example 2 To 4, respectively.

Experimental Example 3: Durability measurement

The durability of the polyurethane foamed foam of Example 1 according to the present invention was measured, and the results are shown in Fig. Example 1 To measure the durability, a specimen of a polyurethane foam foam was cut into a size of 50 * 50 * 25 mm, and then subjected to compression with 50% (12.5 mm) compression using a dynamic fatigue test system (INSTRON) After the progress of the compression, the average value was obtained. The results are shown in FIG.

As shown in FIG. 6, the polyurethane foamed foam had almost no area change when compressed at a rate of 10 to 500,000 times, except when the compression was first performed. Thus, it was found that the durability of the polyurethane foamed foam of Example 1 was good have.

Experimental Example 4: Permanent compression Abbreviation Morphological results after the test

The above polyurethane foamed foam Example 1 was tested to see if there was any change in the shape of the polyurethane foamed foam after the experiment of permanent compression shrinkage. The number distribution of the polyurethane foamed foam of Example 1 according to the size of the cells contained in the unit area before and after the compression compression shrinkage experiment was measured three times, and the average value was obtained. The results are shown in FIG.

As shown in Fig. 7, the polyurethane foam foam of Example 1, which contains polyurethane foam foam cells having a particle size of 40 to 60 mu m in the range of 40 to 60% of the total foamed foam cells, The cell form distribution of the polyurethane foam was similar to that of the polyurethane foam before and after the experiment.

Footprint for collecting insole: 1 sensor base layer: 10
Sensor: 20 conductive contacts: 200

Claims

A sensor base layer comprising foamed polyurethane; And
And a plurality of sensors provided in the sensor base layer,
Wherein said foamed polyurethane comprises foamed foam cells having a particle size of 40 to 60 占 퐉 in a range of 40 to 60% of the entire foamed foam cells.

The method according to claim 1,
Wherein the foamed foam has a number of cells of 50 to 300 per unit area of the foamed polyurethane.

3. The method of claim 2,
Wherein the unit area is 1 to 3 mm < 2 >.

The method according to claim 1,
Wherein the foamed polyurethane is obtained by polymerizing an isocyanate with a polyol obtained by mixing an ether-based polyol and a caprolactone-based polyol.

5. The method of claim 4,
Wherein the isocyanate is methylenediphenyl isocyanate (MDI).

5. The method of claim 4,
Wherein the foamed polyurethane is a foamed polyurethane having an equivalent ratio (NCO / OH) of an isocyanate group and a hydroxyl group in a range of 1 to 3.

The foot pressure collecting insole according to claim 1, wherein the sensor comprises silicon.

8. The method of claim 7,
Wherein said sensor comprises a plurality of electrically conductive contacts.

9. The method of claim 8,
Wherein the conductive contact is made of a mixture of silicon and silicon selected from the group consisting of carbon, metal, and graphene.