JP2000321186A - Method and device for measuring dyanmica characteristics of fiber-shaped object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To objectively measure dynamic characteristics by applying a bending load to a fiber-shaped object while one end is fixed and the other end is released and detecting a bending load for it as a concentrated load. SOLUTION: A movable part 2 itself consists of two plates 2a and 2b where pinching parts 3a and 3b are provided, and the plate is adjusted for pinching by the pinching parts 3a and 3b so that a fiber object can freely move. By operating an actuator and applying a bending load to the fiber-shaped object, a bending load is generated as a concentrated load in the direction of the bending load and in the opposite direction at two probes 4. The load is transferred to a sensor 5 that is mechanically coupled, where a load is changed into an electrical signal. The load to be measured may be in a rotary direction or a Cartesian coordinates components. Further, a signal from the sensor 5 is transmitted to an output end via a cord. The signal is amplified or A/D- converted by an amplifier and is read by a computer for recording and storage, thus judging dynamic characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring the mechanical properties of hair, various fibers, fibrous materials such as sheets and the like, and more particularly, to a method of measuring fibrous properties with one end fixed and the other end open. The present invention relates to a measurement method capable of measuring a bending load generated when a bending load is applied to an object as a concentrated load and measuring a mechanical property of a fibrous object such as hair with a high detection force, and an apparatus used therefor.

[0002]

2. Description of the Related Art Conventionally, mechanical properties of fibrous materials such as hair, various fibers and sheets have been measured by various methods, and are used for comparison of physical properties of various fibrous materials and development of new materials. Have been.

[0003] By the way, for example, the measurement of the mechanical properties of hair involves examining and classifying the properties of the hair of each individual, and in particular, how the properties of the hair change due to the use of hair cosmetics and permanent treatment. It is important to find out. That is, the setting power, hair styling power, flexibility and the like are properties of hair and cosmetics that many people strongly demand, and providing cosmetics that can impart such properties to hair is a major issue in the cosmetics field. one of. And in order to provide the above cosmetics, it is necessary to accurately measure and analyze the setting power, hairdressing power, and flexibility,
Means for this are always desired by cosmetic technicians.

[0004] At present, the evaluation of the setting power, hair styling power, and flexibility of the above hair is generally performed by an evaluator in a sensory evaluation. However, the objectivity was poor. For this reason, various attempts have been made to standardize the evaluation using instruments and the like.

[0005] As a method of measuring the setting power, hair styling power, and flexibility of hair using such instruments and the like, for example, a method in which both ends of the hair are fixed and a bending operation is given, and a method using the deflection caused by the weight of the hair itself And the like.

However, there is a problem in the conventional method for measuring flexibility of not only hair but also fibrous materials, and it is difficult to say that the flexibility of fibrous materials can be accurately measured. That is, for example, the conventional method of fixing both ends of a hair and giving a bending operation is such that the hair is flexible so that the hair measurement portion is easily bent (the displacement between the displacement direction and the bending direction is likely to occur) and further partially. There is a problem that the length of the hair measurement portion is limited because it is easily affected by error factors such as bending from a deteriorated portion.

If the measuring portion of the hair is shortened to solve this problem, another problem occurs in that the detection power is reduced, and an excessive number of hairs is required to increase the detection power. Problems. Furthermore, the method using the deflection caused by the weight of the hair has a problem that the detection power is extremely low, the direction of the hair is easily affected, and the load on the evaluation of the setting force is small.

As described above, even in the conventional method using an instrument or the like, since there are various fluctuation factors in the actual measurement, what does not provide information that accurately indicates the state of a fibrous material such as hair can be obtained. It was hard to say, and it was hardly a standard law. Further, in these conventional methods, a decrease in measurement accuracy is considered due to changes in the angle, speed, and number of bending directions, and cannot be said to reflect the bending operation performed by humans in sensory evaluation.

[0009]

Accordingly, the present invention provides a more accurate method for treating fibrous materials, such as hair, in terms of its condition, in particular, the degree of setting force after application of cosmetics, the degree of hair styling, and the flexibility of hair. It is an object of the present invention to provide a method capable of objectively measuring mechanical properties under more flexible and repeatable dynamic conditions.

[0010]

Under such circumstances, the present inventors have conducted intensive studies to achieve the above object, and as a result, the bending load generated when a bending load is applied with one end of the fibrous material being released is reduced. , Which accurately reflects the physical properties such as the flexibility of the fibrous material, and found that it is possible to objectively evaluate the physical properties of the hair by measuring this, and completed the present invention. .

That is, the present invention is characterized in that a bending load is applied to a fibrous material in a state where one end is fixed and the other end is released, and the bending load on the fibrous material is detected as a concentrated load. To provide a method for measuring the mechanical properties of

Further, the present invention provides a gripping portion for fixing one end of a fibrous material and a holding portion for clamping the fibrous material in a movable state, which are used in the above measuring method, for applying a bending load to the fibrous material. An object of the present invention is to provide a measuring device for measuring mechanical properties of hair, comprising a movable mechanism, a probe provided between the gripping portion and the holding portion, and a probe for sandwiching a fibrous material, and a sensor for measuring a load generated by the probe.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, the method of the present invention is such that a fibrous material is fixed at one end and is sandwiched in a holding portion with the other end released, and a bending load is applied to the fibrous material. This is performed by detecting the load as a concentrated load with a probe (sensor). That is, a bending load is applied at the probe part by giving a motion to the open end side of the fibrous material, a concentrated load generated on the fixed probe is detected, converted into an electric signal, and recorded and analyzed. It is implemented by.

In the method of the present invention, the reason why the fiber is folded in a cantilevered state (a state in which only one is fixed) instead of a state in which both ends are supported (a state in which both are fixed) as in the conventional method is as follows. This is because, since one end of the object is released, the degree of freedom of bending is high and the detectability is improved.

In the method of the present invention, the bending load applied to the fibrous material can be applied by appropriately displacing the open end of the test fibrous material. An example of the displacement is a pendulum motion in the rotation direction. The motion conditions such as the angle, amplitude, speed, and radius of the pendulum motion can be determined for the purpose of measuring the physical properties of the fibrous material. this,
Displacement given to the fibrous material, using an actuator or the like,
It can also be predetermined.

More specifically, for example, when measuring a bending load on the hair by pendulum movement, the exercise conditions are set according to which of the setting force, the hair styling force, the flexibility and the like is to be evaluated. In this case, the pendulum motion can be performed only one reciprocation to measure the bending load.However, the same displacement is repeated a plurality of times, and the hair is vibrated at a constant amplitude and speed to change the cosmetic film on the hair surface. This makes it possible to obtain information on the deterioration of the hair surface and inside, and is more preferable as a condition for evaluating the setting power and the hair styling power.

Further, as the response characteristics of the hair, the bending force is measured at several levels of the vibration angle or the vibration speed, and the relationship between the amplitude and the bending load and the relationship between the frequency and the bending load are grasped, so that the setting force and the hair styling are obtained. Force persistence, durability, thresholds, etc. can be measured. This may be used to determine the properties of setting agents and hair cosmetics.

Next, the present invention will be further described with reference to the drawings showing an example of an apparatus used for carrying out the method of the present invention.

FIG. 2 is a front view of an apparatus for measuring mechanical properties of a fibrous material, and FIG. 3 is a right side view thereof. In each figure, 1 is a gripping part, 2 is a movable part, 3 is a holding part, 4 is a probe, 5 is a sensor, 6 is a support base, 7 is a substrate, 8 is an actuator, 9 is an output terminal, and 10 is a cord. Show.

In order to carry out the method of the present invention using the present measuring device, first, one end of a fibrous material is fixed to the holding portion 1. Next, the fibrous material is passed between the two probes 4, and further sandwiched between the two clamping portions 3 attached to the movable portion 2.

The movable part 2 of the measuring apparatus is connected to an actuator 8, and the actuator moves according to an instruction from a controller (not shown). As the actuator used here, a motor that moves in an appropriate rotational direction can be used, and preferable examples thereof include a pulse motor and a servo motor.

The movable part 2 itself is composed of two plates 2a and 2b provided with clamping parts 3a and 3b, respectively, as can be seen from FIG. 2. By adjusting these plates, the fibrous material can move freely. The holding portion 3a in a state where
3b.

When the actuator 8 is operated to apply a bending load to the fibrous material, a bending load is generated as a concentrated load in the two probes 4 in the drawing in a direction opposite to the bending load direction. The load generated by the probe 4 is transmitted to a mechanically coupled sensor 5, where the load (force)
Is converted to an electrical signal. The load to be measured may be in the direction of rotation or a rectangular coordinate component. Sensor 5
For example, a load detector in an appropriate rotation axis direction and an orthogonal coordinate component direction can be used. Preferred examples thereof include a strain gauge and a multi-axis force sensor.

Further, the signal from the sensor 5 is
Through to the output end 9. The signal from the output terminal 9 is amplified or A / D-converted by an appropriate amplifier (not shown), if necessary, and then output to a computer (not shown).
By recording, storing, and analyzing this, it is possible to determine the mechanical properties of the fibrous material.

In the method of the present invention described above, for example, when the hair is given a rotational motion in a specific direction at a constant speed, the following data is obtained, for example.

(1) Bending load Flexibility, setting force, hair styling force (2) Load change when bending load is repeated Sustainability of setting force, elasticity, brittleness

In addition, according to the method of the present invention, the degree of damage to the hair (branches, cut hairs), stiffness, elasticity, specimens other than hair (threads, fibers, etc.) are caused by changes in load when bending load is repeated. ), It is possible to estimate and determine the strength of a coating film when a hair styling material or a material is applied.

[0028]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited thereto.

Example 1 Measurement of change in bending load of hair due to treatment with set agent: (1) Hair treatment: Using hair sampled from Asians, two types of hair bundles A and B (weight 10 mg, length 6 cm)
It was created. A and B of the hair bundle were treated with a setting agent. Hair bundle A is vinylpyrrolidone / vinyl acetate copolymer 5
% Hair (alcohol 20%, purified water 75%), hair bundle B was a vinylpyrrolidone / N, N-dimethylaminoethyl methacrylic acid copolymer 5% solution (alcohol 20%, purified water 75%), Each was immersed for one hour. The soaked hair bundles A and B were dried in a thermo-hygrostat (25 ° C., 55% humidity) for 24 hours.

(2) Hair bending load measurement: Next, the hair bending load (hair setting force) of the hair bundle obtained in the above (1) was measured by the measuring device shown in FIG. First, the measurement environment was set to a temperature of 25 ± 2 ° C. and a humidity of 55 ± 2%, 10 hairs collected from each hair bundle were collected, one end of which was fixed to the holding portion 1, and the space between the probes 4a and 4b was set. After passing through, it was sandwiched between the holding portions 3a and 3b in a freely moving state (the distance between the holding portion 1 and the probe 4 was 1 cm, and the distance between the probe 4 and the holding portion 3 was about 2 cm). The initial position and motion conditions (amplitude: ±
30 deg, speed: 88 deg / sec) were set, the pendulum movement was performed 50 times on the hair, and the bending load was detected.

(3) Measurement results: FIG. 4 shows the change in the load on the hair bundle A during the measurement, and FIG. 5 shows the change in the load on the hair bundle B during the measurement. As is clear from these figures, the hair bundle A does not show any attenuation of the bending load even after performing the pendulum movement 50 times, and can be evaluated as “elastic”, that is, “set force lasts longer”. there were. On the other hand, the bristle bundle B was remarkably attenuated in bending load, and was evaluated as "the set force is easily damaged over time". Among these hair bundles, A was evaluated as “elastic” and “flexible” in the conventional sensory evaluation, and B was evaluated as “non-elastic” and “brittle”.

As described above, the results of FIGS. 4 and 5 and the results of the sensory evaluation clearly have a correlation, and
According to the method of the present invention, it has been clarified that “persistence of set force”, “elasticity” and “brittleness” can be expressed by numerical values.

Example 2 Measurement of Change in Hair Bending Load by Treatment with Set Agent: (1) Hair treatment: Using hair sampled from Asians, two types of hair bundles A and B (weight 10 mg, length 6 cm)
Was prepared and set. Polyvinylpyrrolidone is used as a setting agent, hair bundle A is a 5% solution of polyvinylpyrrolidone (molecular weight 700,000) (alcohol 20%, purified water 75%), and hair bundle B is 5% of polyvinylpyrrolidone (molecular weight 40,000). Solution (alcohol 20%, purified water 75%)
For 1 hour each. The hair bundles A and B after the immersion treatment were dried in a thermo-hygrostat (25 ° C., humidity 55%) for 24 hours.

(2) Measurement of hair bending load: Next, the hair bending load (setting force) of the hair bundle obtained in the above (1) was measured by a measuring device shown in FIG. First, the measurement environment was set to a temperature of 25 ± 2 ° C. and a humidity of 55 ± 2%, and ten hairs collected from each hair bundle were collected, one end of which was fixed to the gripper 1, and the space between the probes 4 a and 4 b was set. After passing through, it was sandwiched between the holding portions 3a and 3b in a freely moving state (the distance between the holding portion 1 and the probe 4 was 1 cm, and the distance between the probe 4 and the holding portion 3 was about 2 cm). Initial position of probe, motion condition (amplitude: ± 30d) by controller
(eg, speed: 88 deg / sec), the pendulum motion was performed 50 times on the hair, and the bending load was detected.

(3) Measurement result: The load at the time of ± 30 deg bending was obtained from 50 repetitions of the pendulum movement, and the following substitute values were further calculated. (A) Initial bending load: Average of the absolute value of the load after 1 to 5 reciprocations (b) Temporal bending load: Average of the absolute value of the load after 46 to 50 reciprocations Was used as a representative value. FIG. 6 shows the initial bending load and the temporal bending load for the hair bundles A and B.

According to this result, the hair bundle A has a higher initial bending load and a temporal bending load value than the hair bundle A,
There is more. " Among these hair bundles, A
According to the conventional sensory evaluation, is evaluated as "having a set power" or "hard", and B is evaluated as "having no set power" or "soft".

As described above, the result of the method of the present invention and the result of the sensory evaluation clearly have a correlation, and therefore, the "setting force" and "hardness" can be expressed by numerical values according to the method of the present invention. It became clear that it becomes.

Example 3 Measurement of change in hair bending load by rinsing agent treatment: (1) Hair treatment: Using hair sampled from Asians, two types of hair bundles A and B (100 hairs, length 6 cm)
Was prepared, and only B was subjected to a rinsing treatment (using a salon-style hair rinse α (manufactured by Kose Corporation)). The hair bundle B after the treatment is placed in a thermo-hygrostat (25 ° C., 55% humidity) for 2 hours.
Dried for 4 hours.

(2) Hair bending load measurement: Next, the hair bending load of the hair bundle obtained in the above (1) was measured by a measuring device shown in FIG. First, set the measurement environment to temperature 2
With the temperature set at 5 ± 2 ° C. and the humidity at 55 ± 2%, one end of the hair bundle is fixed to the gripper 1, passed between the probes 4 a and 4 b, and then freely moved between the clamps 3 a and 3 b. (The distance between the grasping part 1 and the probe 4 was 1 cm, and the distance between the probe 4 and the holding part 3 was about 2 cm). The initial position of the probe and the motion conditions (amplitude: ± 10d)
(eg, speed: 10 deg / sec), the pendulum motion was performed one reciprocation for each hair, and the bending load was detected.

(3) Measurement results: +10 deg, -10 d
Fig. 7 shows the results of measuring the load (absolute value) when bending the eg.
It was shown to. As is clear from these results, the hair bundle B had lower bending load values of +10 deg and -10 deg than A, and the fluctuation was small. Of these hair bundles, B is A
Is evaluated as "flexible" in the conventional sensory evaluation.

As described above, according to the method of the present invention, it has become possible to objectively express the state in which the hair has increased the "softness" by the rinsing agent.

[0042]

As described above, according to the method for measuring the mechanical properties of a fibrous material of the present invention, the physical properties of a fibrous material such as hair can be clearly and objectively determined. And, for example, the result of the hair has a high correlation with the result of the sensory evaluation which has been conventionally performed, so that it can be used as a new method instead of the sensory evaluation method.

[Brief description of the drawings]

FIG. 1 is a drawing schematically showing the measurement principle of the method of the present invention.

FIG. 2 is a drawing showing the front of the mechanical characteristic measuring device of the present invention.

FIG. 3 is a drawing showing a right side surface of the mechanical characteristic measuring device of the present invention.

FIG. 4 is a diagram showing a change in load for the hair bundle A of Example 1.

FIG. 5 is a diagram showing a change in load with respect to a hair bundle B of Example 1.

FIG. 6 is a view showing an initial bending load and a temporal bending load of hair bundles A and B of Example 2.

FIG. 7: +10 for hair bundles A and B of Example 3
The figure which shows the load (absolute value) at the time of bending of deg and -10deg.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Grip part 6 ... Support base 2 ... Movable part 7 ... Substrate 3 ... Nipping part 8 ... Actuator 4 ... Probe 9 ... Output end 5 ... Sensor 10 ... Code

Claims (7)

[Claims] A fibrous material is characterized in that a bending load is applied to a fibrous material in a state where one end is fixed and the other end is released, and the bending load on the fibrous material is detected as a concentrated load. How to measure properties. 2. The method for measuring mechanical properties of a fibrous material according to claim 1, wherein the fibrous material is hair. 3. The method according to claim 1, wherein the bending load is applied by a predetermined pendulum motion. 4. The method for measuring mechanical properties of a fibrous material according to claim 3, wherein a predetermined pendulum motion is repeated a plurality of times to detect the attenuation of the bending load. 5. The method for measuring mechanical properties of a fibrous material according to claim 3, wherein the predetermined pendulum motion is accompanied by a change in speed. 6. The method for measuring mechanical properties of a fibrous material according to claim 3, wherein the predetermined pendulum motion is accompanied by a change in amplitude. 7. A holding mechanism for fixing one end of the fibrous material, a holding portion for holding the fibrous material in a movable state, a movable mechanism for applying a bending load to the fibrous material, and a movable mechanism for applying a bending load to the fibrous material. An apparatus for measuring mechanical properties of hair, comprising a probe provided between the probe and a sensor for measuring a load generated by the probe.