WO2017221345A1

WO2017221345A1 - Absorbed-water-dependent-friction measurement device and absorbed-water-dependent-friction measurement method

Info

Publication number: WO2017221345A1
Application number: PCT/JP2016/068508
Authority: WO
Inventors: 幹也倉本; 友香理井土
Original assignee: 一般財団法人カケンテストセンター
Priority date: 2016-06-22
Filing date: 2016-06-22
Publication date: 2017-12-28
Also published as: JP6169813B1; CN109313174B; JPWO2017221345A1; CN109313174A; KR102394817B1; KR20190021232A

Abstract

This absorbed-water-dependent-friction measurement device (1) is provided with: a scale support part (2); a scale (3) supported above the scale support part (2); a measurement tool (4) that is suspended from a weighing tray support part of the scale (3) and holds a flexible, water-absorbing, sheet-like sample (9) in a space formed by the scale support part (2) such that the sample (9) is spread out and suspended; and a friction element (5) that has a portion of a spheroidal surface that is a surface of rotation around the central axis of the friction element (5), is supported such that the central axis is horizontal and parallel to the sheet surface of the sample (9) held by the measurement tool (4), is capable of translation, in a direction within a surface orthogonal to the central axis that intersects with the sheet surface, between a first position in which the friction element (5) is not in contact with the sample (9) and a second position in which the spheroidal surface is in contact with the sheet surface of the sample (9), and is such that the part of the spheroidal surface in contact with the sample (9) is capable of rotating around the central axis in the direction of gravity at the second position. The scale (3) outputs an indication value for when the friction element (5) is at the first position and an indication value for when the friction element (5) is rotating at the second position.

Description

Water content dependent friction force measuring device and water content dependent friction force measuring method

The present invention relates to a water retention amount-dependent friction force measuring device and a water retention amount-dependent friction force measurement method for measuring the friction force of a fabric material having a friction force different depending on the water retention amount.

Since the increase in humidity on the skin surface causes unpleasant sensation when wearing clothing, clothing with improved hygroscopicity and quick drying properties as described in Patent Documents 1 to 7 have been developed. In the case of clothing, not only the moisture transfer characteristics of the fabric material but also the interface state between the water and the skin existing on the surface are major factors that affect the comfort. There is “stickiness” in the sense resulting from this. The “stickiness” of clothing is related to the frictional force of the wet fabric material.

Patent Document 1 describes that 1 cc of water is injected between a rotating metal roller and a fabric, and the tension applied to the fabric is measured as the wet frictional force of the fabric.

In Patent Document 2, water exceeding the saturated water absorption amount of the sample fabric is dropped onto the acrylic plate, and the sample fabric is placed on the acrylic plate so that the surface on the skin side is downward when making it into clothing. Next, the yarn attached to the center of the outer surface of the sample fabric is pulled up vertically using a tensile tester to peel the sample fabric from the acrylic plate, and the maximum value of the force required at that time is read. , It is described as a sticking force.

In Patent Document 7, let's attach a skin surface side to a sample in which a certain amount of moisture is uniformly contained from the skin surface, and a cylinder made of acrylic resin is set up vertically, with the longitudinal direction of the sample as the vertical direction. It is described that the bare water content that cannot be pasted is used as a curved surface sticking index.

JP-A-9-195172 JP 2001-303408 A JP 2013-133572 A JP 2012-21254 A JP 2004-11069 A JP 2001-254244 A JP 2004-270047 A

摩擦 The frictional force of the wet dough material varies depending on the amount of water retained. With the methods for evaluating the wet friction force of the dough material described in

Patent Documents

1, 2, and 7, the relationship between the water content and the friction force of the dough material could not be accurately measured.

The present invention has been made in view of the above-described circumstances, and an object thereof is to accurately measure the relationship between the water content of a sample and the frictional force.

In order to achieve the above object, the water content-dependent frictional force measuring device according to the present invention comprises:
A balance support part that forms a space that can accommodate a sheet-like sample having flexibility and water-holding property in a state where the sample is spread and suspended; and
A scale supported on the scale support;
A measuring jig that is suspended from the weighing pan support portion of the balance and holds the sample in a suspended state in a space formed by the balance support portion, and
A rotating surface around a central axis, having a part of a rotating ellipsoid including a cylindrical surface, the rotating ellipsoid facing the sheet surface of the sample held by the measuring jig A first position where the central axis is parallel to and horizontally supported by a sheet surface of the sample held by the measurement jig and does not contact the sample held by the measurement jig; and It is possible to translate between the second position where the spheroidal surface is in contact with the held sheet surface of the sample in a direction intersecting the sheet surface among the surfaces orthogonal to the central axis, A position where the portion in contact with the sample is rotatable in the direction of gravity with the central axis as a rotation axis;
With
The balance is an indication value when the friction element is at the first position, and a portion where the friction element contacts the sample at the second position rotates in the direction of gravity with the central axis as a rotation axis. The indicated value is output.

The water content-dependent frictional force measuring method according to the present invention is:
A sheet-like sample having flexibility and water repellency is suspended from a weighing pan support portion of a balance supported on a balance support portion that forms a space that can be accommodated in an unfolded and suspended state. Moisture is applied to the sample and held in a measurement jig that holds the sample in a state where the sample is spread and suspended in the space formed by the support part,
A rotating surface around a central axis, having a part of a rotating ellipsoid including a cylindrical surface, the rotating ellipsoid facing the sheet surface of the sample held by the measuring jig From the first position where the center axis is parallel to the sheet surface of the sample held by the measurement jig and supported horizontally, the friction element is not in contact with the sample held by the measurement jig. To the second position where the spheroidal surface comes into contact with the sheet surface of the sample held by the jig, in the plane orthogonal to the central axis, in a direction intersecting the sheet surface,
The friction element is rotated at the second position where the portion in contact with the sample is in the direction of gravity with the central axis as a rotation axis.
The indication value when the friction element is in the first position, which is output from the balance, and the portion where the friction element contacts the sample at the second position rotate in the direction of gravity with the central axis as the rotation axis. Record the indicated value.

According to the present invention, it is possible to accurately measure the relationship between the water holding amount of the sample and the frictional force.

It is a figure which shows the structural example of the water retention amount dependent frictional force measuring apparatus which concerns on embodiment of this invention. It is a figure which shows an example of the 1st position of the friction element of the water holding | maintenance amount dependence frictional force measuring apparatus which concerns on embodiment. It is a figure which shows an example of the 2nd position of the friction element of the water holding | maintenance amount dependence frictional force measuring apparatus which concerns on embodiment. It is a figure which shows the diffusive residual moisture content performance of the sample A and sample B which concern on embodiment. It is a figure which shows the measurement result of the frictional force of the sample A which concerns on embodiment. It is a graph which shows the relationship between the residual moisture content and the frictional force in the drying process of the sample A which concerns on embodiment. It is a graph which shows the relationship between the residual moisture content and the frictional force in the drying process of the sample B which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

FIG. 1 is a diagram illustrating a configuration example of a water retention amount-dependent friction force measuring apparatus according to an embodiment of the present invention. The water holding amount-dependent frictional force measuring device 1 includes a balance support unit 2, a balance 3, a measurement jig 4, a friction element 5, a drive unit 6a, and a drive unit 6b (hereinafter, collectively referred to as a drive unit 6). ), An upper columnar member 7 a and a lower columnar member 7 b (hereinafter, collectively referred to as a columnar member 7), and a storage device 8. The balance support part 2 forms a space in which a sheet-like sample 9 having flexibility and water repellency can be accommodated in a state where it is spread and suspended. The balance 3 is supported on the balance support part 2. The measuring jig 4 is suspended from the weighing pan support part of the balance 3, and holds the sample 9 in a state where the sample 9 is spread and suspended in the space formed by the balance support part 2. At this time, a constant tension may be applied by applying a load under the sample 9 held by the measuring jig 4.

In the cylindrical friction element 5, the cylindrical surface which is a rotating surface around the central axis faces the sheet surface of the sample 9 held by the measuring jig 4, and the sample 9 has the central axis held by the measuring jig 4. Is supported in parallel and horizontally to the sheet surface. The sheet surface refers to a surface facing the friction element 5 among the two widest surfaces of the sample 9 that is spread and suspended on the measuring jig 4. The friction element 5 is between the first position where the sample 9 held by the measurement jig 4 does not contact the second position where the cylindrical surface contacts the sheet surface of the sample 9 held by the measurement jig 4. It can be translated in a direction perpendicular to the sheet surface. The friction element 5 is in the second position, and the portion in contact with the sample 9 can rotate in the direction of gravity with the central axis as the rotation axis.

The driving unit 6a is constituted by an actuator, for example, and moves the friction element 5 from the first position to the second position and from the second position to the first position. The drive part 6b is comprised, for example with a motor, and rotates the friction element 5 in a 2nd position. The driving unit 6 moves the friction element 5 from the first position to the second position, rotates the friction element 5 at the second position, and then moves the friction element 5 to the first position one or more times.

The cylindrical columnar member 7 has a central axis that is horizontally supported on the opposite side of the friction element 5 with respect to the sheet surface of the sample 9 held by the measuring jig 4. The columnar member 7 does not contact the sample 9 when the friction element 5 is in the first position, and contacts the sample 9 when the friction element 5 is in the second position. The upper columnar member 7a is disposed above the central axis of the friction element 5 when in the second position. The lower columnar member 7b is disposed below the central axis of the friction element 5 when in the second position. Here, a state where the friction element 5 is in the first position and the second position will be described.

FIG. 2A is a diagram illustrating an example of a first position of a friction element of the water retention amount-dependent friction force measuring apparatus according to the embodiment. FIG. 2A shows a cross section of the friction element 5, the measuring jig 4, the drive unit 6, and the columnar member 7 in the first position when viewed in the direction of the central axis of the friction element 5. When the friction element 5 is in the first position, the sheet surface of the sample 9 held in a state of being spread and suspended on the measuring jig 4 extends in the vertical direction. At this time, the friction element 5 and the columnar member 7 do not contact the sample 9. The friction element 5 is moved in the direction of the arrow T from the first position by the drive unit 6a.

FIG. 2B is a diagram illustrating an example of a second position of the friction element of the water retention amount-dependent friction force measuring device according to the embodiment. FIG. 2B shows a cross section of the friction element 5, the measuring jig 4, the drive unit 6, and the columnar member 7 in the second position when viewed in the direction of the central axis of the friction element 5. When the friction element 5 is moved to the second position by the drive unit 6a, the sample 9 contacts the columnar member 7, and contacts the friction element 5 with an area defined by the position of the friction element 5 and the columnar member 7. When a load is applied under the sample 9, the sample 9 comes into contact with the friction element 5 more stably. The friction element 5 is rotated in the direction of arrow R by the drive unit 6b at the second position. The direction of arrow R is the direction in which the portion of the friction element 5 that contacts the sample 9 rotates in the direction of gravity with the central axis as the rotation axis.

The friction element 5 is supported so as to be freely rotatable around the central axis until it moves from the first position to the second position. Thereby, when the friction element 5 moves to the second position, it can be suppressed that the sample 9 is pulled by contacting the friction element 5. The columnar member 7 is supported so as to be freely rotatable around the central axis. Thereby, when the friction element 5 moves to the 2nd position, it can suppress that the sample 9 is pulled by contacting the columnar member 7. FIG.

The friction element 5 generally has a shape having a part of a spheroid that is a rotating surface around the central axis. The cylindrical surface can be regarded as a case where the major axis of the ellipse forming the spheroid is infinite. Further, when the major axis and the minor axis of the ellipse forming the spheroid are equal to each other, it is a spherical surface. In the present application, the spheroidal surface includes a cylindrical surface and a spherical surface. When the cylindrical frictional element 5 is used, a part having a surface close to the cylindrical surface of the human body can be simulated, and when the frictional element 5 is in the second position, the sample 9 has a certain area and the frictional element 5 has a constant area. Can be brought into contact with the cylindrical surface. When the spherical friction element 5 is used, a part having a surface close to the spherical surface of the human body can be simulated, and when the friction element 5 is in the second position, the sample 9 is moved along the curve of the spherical surface of the friction element 5. Can be contacted. In this way, the shape of the friction element 5 may be selected in accordance with the curve of the part of the human body that is supposed to come into contact with the clothing using the sample 9 as a fabric material.

The water retention amount-dependent frictional force measuring device 1 does not have to include the drive unit 6. In this case, the user manually moves the friction element 5 from the first position to the second position, rotates the friction element 5 at the second position, and then moves the friction element 5 to the first position. When the user manually rotates the friction piece 5, the water retention amount-dependent friction force measuring device 1 may include a rotation speed detection unit that detects the rotation speed of the friction piece 5.

The balance 3 in FIG. 1 has an instruction value when the friction element 5 is in the first position (state of FIG. 2A) and an instruction value when the friction element 5 rotates at the second position (state of FIG. 2B). The data is output to the storage device 8. The storage device 8 records the instruction value output by the balance 3 when the friction element 5 is at the first position and the instruction value when the friction element 5 rotates at the second position. The balance 3 and the storage device 8 repeat these operations in accordance with the operation of the friction element 5. The indication value of the balance 3 when the friction element 5 is in the first position indicates the mass of the sample 9 itself + the amount of water held. The indication value of the balance 3 when the friction element 5 rotates at the second position is The mass of the sample 9 itself + the amount of water held + the frictional force of the sample 9 is shown. This makes it possible to measure the amount of water retained in the sample 9 when the frictional element 5 immediately before and immediately after the frictional element 5 rotates at the second position is in the first position. The relationship with force can be accurately measured.

In the water retention amount-dependent frictional force measuring device 1, since the friction force is expressed by the indicated value of the balance 3, the unit is g weight, which is the unit mass (g) at the place where the water retention amount-dependent frictional force measurement device 1 is installed. The frictional force is expressed in the unit of gravity applied to. Assuming that the friction coefficient is the same when the sample, the amount of water held, and the ambient atmosphere conditions are the same, the friction force is the total pressure applied to the friction surface x the friction coefficient. Since the total pressure on the surface is proportional to the acceleration of gravity, the frictional force is also different. However, if the friction force is measured in terms of mass x gravitational acceleration at the measurement location, the total pressure applied to the friction surface is the mass of the sample x gravitational acceleration at the measurement location. The indicated value of the frictional force in units of gravitational acceleration is the same value. When calculating the friction coefficient, the value of the friction force when the friction element 5 rotates at the second position is set, and the friction element 5 immediately before and after the rotation of the friction element 5 at the second position is at the first position. Divide by the average value of the mass of the sample 9 (the mass of the sample 9 itself + the amount of water held).

The storage device 8 may store the rotational speed of the friction element 5. The storage device 8 is not limited to a PC as shown in FIG. 1, and may be any device provided with a non-volatile memory such as a flash memory or a hard disk. The balance 3 may display the indicated value on the display unit, and the user may read and record it. In this case, the water retention amount-dependent frictional force measuring device 1 may not include the storage device 8. Further, the balance 3 has an indication value from when the friction element 5 comes into contact with the sheet surface of the sample 9 and before the rotation at the second position is started, and when the friction element 5 finishes the rotation at the second position. To the storage device 8 may be further output to the storage unit 8. Thereby, the relationship between the amount of water held in the sample 9 and the force applied when the friction element 5 comes into contact with the sample 9 and the force applied when leaving the sample 9 can be accurately measured. The balance 3 may output an instruction value from when the friction element 5 finishes moving to the second position to before starting rotation at the second position. Thereby, it is possible to accurately measure the relationship between the water holding amount of the sample 9 and the force with which the sample 9 in contact with the friction element 5 after moving to the second position tries to return to the original position. Further, the balance 3 may output an instruction value from when the friction element 5 finishes rotating at the second position to before starting to move to the first position. Thereby, it is possible to accurately measure the relationship between the water holding amount of the sample 9 and the force with which the sample 9 in contact with the rotated friction element 5 at the second position returns.

The water retention amount-dependent frictional force measuring device 1 may include only the upper columnar member 7a or only the lower columnar member 7b. The columnar member 7 may not be cylindrical as long as it is columnar, and may be supported so as not to rotate. Alternatively, the water retention amount-dependent frictional force measuring device 1 may not include the columnar member 7.

The friction element 5 may be supported around the central axis so that it cannot rotate or the rotation angle is limited until it moves from the first position to the second position. Thereby, when the human body wears clothing using the sample 9 as a fabric material, the force applied when contacting and the force applied when leaving can be simulated in a form close to the actual situation. The rotation angle at which the friction element 5 is limited may be set assuming, for example, the amount that the skin is stretched and stretched when the human body moves while touching the clothing. By providing the friction element 5 with play that allows the skin to move due to friction with the clothing, when the human body wears clothing made of the sample 9 as a fabric material, it is applied when the skin is pulled and the stretched portion comes into contact. It is possible to mimic the force and the force applied when leaving.

Further, the friction element 5 is not limited to the configuration in which the friction element 5 is translated in the direction perpendicular to the sheet surface between the first position and the second position, and the friction element 5 is disposed between the first position and the second position. It is only necessary to be able to translate in the direction intersecting the sheet surface among the surfaces orthogonal to the central axis. That is, the friction element 5 may translate in a plane orthogonal to the central axis and contact the sheet surface from diagonally below or diagonally above. If the friction element 5 moves in a plane perpendicular to the central axis to the second position and comes into contact with the sheet surface at an appropriate angle from obliquely below, the friction element 5 and the columnar member 7 that are supported so as not to rotate are supported. It can be suppressed that the sample 9 is pulled by the sample 9 coming into contact with the sample 9. If the friction element 5 translates in a plane perpendicular to the central axis to the second position and makes contact with the seat surface from an oblique angle at an appropriate angle, the friction element 5 cannot always rotate around the central axis. Even in the supported configuration, the frictional force can be measured between the time when the sample 9 is brought into contact with the sheet surface and the time when the movement to the second position is completed. Here, the flow of measurement will be described.

When starting measurement, the user holds the sample 9 on the measurement jig 4. The measuring jig 4 includes a needle portion extending in the horizontal direction, and the user penetrates and fixes the upper portion of the sample 9 to the needle portion. The portion of the measuring jig 4 that fixes the sample 9 is not limited to the shape that allows the sample 9 to pass therethrough, and may have a shape that sandwiches the sample 9. The user drops a predetermined amount of water on the sheet surface of the sample 9 held in a state of being spread and suspended on the measuring jig 4. The user may hold the sample 9 on the measurement jig 4 after dripping a predetermined amount of water onto the sample 9. The method of applying moisture to the sample 9 is not limited to the method of dripping a predetermined amount of water. For example, the sample 9 may be immersed in water, and the sample 9 that has sufficiently absorbed water may be held by the measurement jig 4. The water retention amount-dependent frictional force measuring device 1 may include a water supply device that applies moisture to the sheet surface of the sample 9 that is held in a state of being spread and suspended on the measurement jig 4. The water supply device may apply moisture to the sample 9 in a state where the sample 9 is not suspended from the measurement jig 4.

The user turns on the driving unit 6 after dripping a predetermined amount of water onto the sheet surface of the sample 9. When the drive unit 6 is turned on, the friction element 5 is moved from the first position to the second position and rotated at the second position. The drive unit 6 rotates the friction element 5 at the second position and then moves it to the first position. The balance 3 outputs the instruction value when the friction element 5 is in the first position and the rotation value at the second position, and the storage device 8 records the instruction value. The water retention amount-dependent frictional force measuring apparatus 1 repeats these operations once or more.

In the case where the water retention amount-dependent frictional force measuring device 1 does not include the drive unit 6, the user manually drops the determined amount of water on the sheet surface of the sample 9 and then manually moves the friction element 5 to the first position. To the second position and rotated at the second position. The user manually rotates the friction element 5 at the second position and then moves it to the first position. At this time, the rotation speed detection unit detects the rotation speed of the friction element 5 and outputs it to the storage device 8. The storage device 8 records the instruction value when the friction element 5 rotates at the second position and the value of the rotation speed of the friction element 5 in association with each other. Here, measurement examples of two different samples will be described.

FIG. 3 is a diagram showing the diffusive residual moisture content performance of Sample A and Sample B according to the embodiment. As shown in FIG. 3, in the drying process, the residual moisture content of Sample A and Sample B decreases with time, and shows different diffusive residual moisture performance depending on the material and structure.

FIG. 4 is a diagram illustrating a measurement result of the frictional force of the sample A according to the embodiment. The measured value of the friction force of the sample A is repeatedly recorded at an interval determined by the movement interval between the first position and the second position of the friction element 5. Hereinafter, the period in which the measured value of the friction force of the sample A is recorded is referred to as a load ON period, and the period in which the measured value of the friction force of the sample A is not recorded is referred to as a load OFF period. The water retention amount-dependent frictional force measuring device 1 records the indicated value of the balance 3 when the friction element 5 is in the first position during the load OFF period. The water retention amount-dependent frictional force measuring apparatus 1 is configured so that the sample A in a completely dried state is measured from the indication value of the balance 3 when the friction element 5 is in the first position (mass of the sample A itself + water retention amount). A value obtained by subtracting the indicated value of the balance 3 (the mass of the sample A itself) when held at 4 is measured as the water holding amount of the sample A. In addition, the moisture content-dependent frictional force measuring apparatus 1 uses the water content when a predetermined amount of water is dropped on the sheet surface of the sample A as a residual water content of 100%, and calculates the residual water content from the water content of the sample A. calculate.

The water retention amount-dependent friction force measuring device 1 records the indicated value of the balance 3 when the friction element 5 rotates at the second position during the load ON period. The water retention amount-dependent friction force measuring apparatus 1 determines the friction immediately before and after the indication value of the balance 3 (the mass of the sample A itself + the amount of water retained + the friction force of the sample A) when the friction element 5 rotates at the second position. A value obtained by subtracting the average value of the indicated values of the balance 3 when the child 5 is in the first position (the mass of the sample A itself + the water holding amount) is measured as the frictional force of the sample A. Here, the indication value of the balance 3 when the friction element 5 is in the first position is the average value of the load OFF period, and the indication value of the balance 3 when the friction element 5 rotates in the second position is the load value. The average value during the ON period. In the graph of FIG. 4, the average value of the load ON period is plotted. The same measurement is performed when the friction force of the sample B is measured by the water retention amount-dependent friction force measuring apparatus 1.

As described above, the water retention amount-dependent friction force measuring apparatus 1 moves the friction element 5 from the first position to the second position, rotates the friction element 5 at the second position, and then moves the friction element 5 to the first position. By outputting the instruction value when rotating at the first position and when rotating at the second position and recording the instruction value twice or more, the water holding amount and friction of the sample A and the sample B in the drying process are repeated. The change in force can be measured.

FIG. 5A is a graph showing the relationship between the residual moisture content and the frictional force in the drying process of Sample A according to the embodiment. Sample A shows a peak value of the frictional force when the residual moisture content is 85%. FIG. 5B is a graph showing the relationship between the residual moisture content and the friction force in the drying process of Sample B according to the embodiment. Sample B shows a peak value of the frictional force when the residual moisture content is 80%. In addition, the frictional force of Sample A varies greatly depending on the residual moisture content, but in Sample B, the change in frictional force due to the residual moisture content is small. Thus, the relationship between the residual moisture content and the frictional force in the drying process varies depending on the material and structure of the sample.

According to the water retention amount-dependent frictional force measuring apparatus 1 according to the present embodiment, the relationship between the water retention amount and the frictional force of the sample 9 can be accurately measured. Further, by analyzing the relationship between the water holding amount of the sample 9 and the frictional force, it is possible to evaluate “stickiness” when wearing a garment using the sample 9 as a fabric material.

The present invention is capable of various embodiments and modifications without departing from the broad spirit and scope of the present invention. The above-described embodiments are for explaining the present invention and do not limit the scope of the present invention. The scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Water holding amount dependent frictional force measuring apparatus 2 Balance support part 3 Balance 4 Measuring jig 5

Friction element

6, 6a, 6b Drive part 7 Columnar member 7a Upper columnar member 7b Lower columnar member 8 Memory | storage device 9 Sample R, T Arrow

Claims

A balance support part that forms a space that can accommodate a sheet-like sample having flexibility and water-holding property in a state where the sample is spread and suspended; and
A scale supported on the scale support;
A measuring jig that is suspended from the weighing pan support portion of the balance and holds the sample in a suspended state in a space formed by the balance support portion, and
A rotating surface around a central axis, having a part of a rotating ellipsoid including a cylindrical surface, the rotating ellipsoid facing the sheet surface of the sample held by the measuring jig A first position where the central axis is parallel to and horizontally supported by a sheet surface of the sample held by the measurement jig and does not contact the sample held by the measurement jig; and It is possible to translate between the second position where the spheroidal surface is in contact with the held sheet surface of the sample in a direction intersecting the sheet surface among the surfaces orthogonal to the central axis, A position where the portion in contact with the sample is rotatable in the direction of gravity with the central axis as a rotation axis;
With
The balance is an indication value when the friction element is at the first position, and a portion where the friction element contacts the sample at the second position rotates in the direction of gravity with the central axis as a rotation axis. A water-amount-dependent frictional force measuring device that outputs the indicated value.
The water retention amount-dependent friction force measuring device according to claim 1, wherein the spheroid of the friction element is a cylindrical surface.
The balance includes an indication value from when the friction element contacts the sheet surface of the sample and before starting rotation at the second position, and when the friction element finishes rotating at the second position. The water retention amount-dependent frictional force measuring device according to claim 1 or 2, further outputting an instruction value until the sample separates from the sheet surface of the sample.
The balance according to any one of claims 1 to 3, wherein the balance further outputs an instruction value from when the friction element finishes moving to the second position to before starting rotation at the second position. The water content-dependent frictional force measuring device described.
The balance according to any one of claims 1 to 4, wherein the balance further outputs an instruction value from when the friction element finishes rotating at the second position to before starting to move to the first position. The water content-dependent frictional force measuring device described.
A central axis is parallel to the sheet surface and horizontally supported on the opposite side of the friction surface with respect to the sheet surface of the sample, and when the friction element is in the first position, the sample does not contact the sample, The water retention amount-dependent friction force measuring device according to claim 1, further comprising a columnar member that contacts the sample when the friction element is in the second position.
The columnar member is disposed above the central axis of the friction element when in the second position, and the upper columnar member is disposed below the central axis of the friction element when in the second position. The water retention amount-dependent frictional force measuring device according to claim 6, comprising a lower columnar member.
The water retention-dependent frictional force measuring device according to claim 6 or 7, wherein the columnar member has a cylindrical shape and is supported so as to be freely rotatable around a central axis of the cylindrical shape.
9. The friction element according to claim 1, wherein the friction element is supported so as to be freely rotatable around a central axis of the friction element until the friction element moves from the first position to the second position. For measuring the amount of water-dependent friction force.
9. The friction element according to claim 1, wherein the friction element is supported around the central axis of the friction element so that it cannot rotate or has a limited rotation angle until the friction element moves from the first position to the second position. The water content-dependent frictional force measuring device according to claim 1.
The friction element is moved from the first position to the second position, rotated around the central axis of the friction element at the second position, and rotated at the second position and then moved to the first position. The water retention amount-dependent frictional force measuring device according to any one of claims 1 to 10, further comprising a drive unit.
The driving unit moves the friction element from the first position to the second position, rotates the friction element around a central axis of the friction element at the second position, and rotates the friction element at the second position. The water retention amount-dependent frictional force measuring apparatus according to claim 11, wherein the movement to one position is repeated twice or more.
The water retention-dependent frictional force measuring device according to any one of claims 1 to 12, further comprising a storage device that records an instruction value output by the balance.
The water retention amount-dependent friction force measuring device according to any one of claims 1 to 13, further comprising a water supply device that applies moisture to the sample held by the measuring jig.
A sheet-like sample having flexibility and water repellency is suspended from a weighing pan support portion of a balance supported on a balance support portion that forms a space that can be accommodated in an unfolded and suspended state. Moisture is applied to the sample and held in a measurement jig that holds the sample in a state where the sample is spread and suspended in the space formed by the support part,
A rotating surface around a central axis, having a part of a rotating ellipsoid including a cylindrical surface, the rotating ellipsoid facing the sheet surface of the sample held by the measuring jig From the first position where the center axis is parallel to the sheet surface of the sample held by the measurement jig and supported horizontally, the friction element is not in contact with the sample held by the measurement jig. To the second position where the spheroidal surface comes into contact with the sheet surface of the sample held by the jig, in the plane orthogonal to the central axis, in a direction intersecting the sheet surface,
The friction element is rotated at the second position where the portion in contact with the sample is in the direction of gravity with the central axis as a rotation axis.
The indication value when the friction element is in the first position, which is output from the balance, and the portion where the friction element contacts the sample at the second position rotate in the direction of gravity with the central axis as the rotation axis. A method for measuring the amount of water-dependent friction force that records the indicated value at the time.