JPS62280636A - Measuring method for touch feeling of hair - Google Patents

Abstract

PURPOSE:To approximately digitize and measure the surface property of hair sensationally, i.e. touch sensation by moving a contactor made of a foamed body relatively while pressing it against a bundle of hair with constant force and measuring the degree of friction of the hair from the force required for the movement. CONSTITUTION:The contactor 2 made of the foamed body which has soft elasticity close to that of the skin of fingers is fixed and held on a rigid substrate 3, which is loaded with the specific force N to clamp the bundle 1 of hair from above and below and bring it into contact. In this state, the force T required to draw the bundle 1 of hair lengthwise at a constant speed in this state is measured. The drawing force T relates to the force of friction between the hair 1 and contactor 2, so the degree of surface friction of the hair is obtained while digitized. Thus, a contacting state close to the contacting state between the fingers and hair is realized, so a measurement result close to the touch sensation is obtained quantitatively.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) This invention approximately quantifies the sensory surface properties of hair, such as the touch and feel of the hair, based on the surface friction of the hair. The present invention relates to a hair texture measurement method that enables hair texture measurement.

(Prior Art) The texture when rinsing or pulling hair with your fingers varies depending on each individual hair, and is one of the important items to know about the properties of hair. However, since the above-mentioned tactile sensation belongs to the human five senses, and the sensations are different on the right and left sides of the measurement, it is difficult to quantify and obtain objective measurement results.

If we understand the texture as the degree of friction between the skin and hair,
Although physical measurement is possible, the conventional method for measuring the surface friction of hair is to contact a rotating circular metal pulley with a single hair, and measure the hair before and after the metal pulley. The degree of friction of the hair is measured by the tension difference or the rotational resistance of the metal pulley received from the hair, or
Alternatively, the degree of friction of the hair is measured by the resistance force against the comb when the hair is combed through the hair bundle.

(Problems to be Solved by the Invention) Conventional measurement methods all measure friction by contacting hair with a rigid body, and the soft elasticity of the skin when gripping the hair with the fingertips causes the hair to be encapsulated. Since the contact state between the fingertips and the hair is different from the state in which the hair is touched, it was not possible to reflect the touch sensation.

Furthermore, in the conventional measurement method, wear occurs at the same time as friction, and the contact area is difficult to keep constant, so the method does not have good reproducibility.

This invention makes it possible to measure the degree of friction of hair with good reproducibility in a state that approximates the feel to the touch, and to approximately quantify and measure the sensory surface properties of hair called the touch to the touch.

(Means for Solving the Problems) In order to solve the above problems, the means adopted by the present invention is to bring a contact made of a foam into contact with the hair bundle with a constant force, and then bring the contact between the hair bundle and the contact. The invention is characterized in that the degree of friction of the hair is measured by the force required for the movement.

(Function) The foam is brought into contact with the hair bundle with a constant force, and the degree of friction of the hair is measured by the force required for relative movement between the foam and the hair bundle. Since the foam comes into contact with the hair in a way that surrounds it, it is possible to create a contact state similar to that of skin contact, and the contact area is large and constant, making it possible to achieve accurate and reproducible results. You can get good results.

(Effects of the invention) Since it is possible to reproduce a contact state similar to the contact state between fingers and hair, it is possible to quantify and collect measurement results that are similar to the sense of touch, making it possible to diagnose hair health conditions, etc. It is possible to provide a measurement means suitable for this purpose.

(Embodiments) Preferred embodiments of the present invention will be described below with reference to the drawings. In the figure, (1) shows a hair bundle, and a desired plurality of hairs are selected without being cut from the scalp and used for direct measurement.

(2) is a measurement contact made of foam.

It is desirable that the foam has a soft elasticity similar to that of the skin of a finger, and when brought into contact with the hair with a predetermined force (N), it surrounds the outer periphery of the hair bundle (1) as shown in Figure 2. and make contact. By surrounding and contacting the outer periphery of the hair bundle (1) in this manner, the area of contact with the hair becomes large and constant. The material of the foam is not particularly limited, but preferable examples include urethane, polyethylene, acrylonitrile butadiene rubber, styrene butadiene rubber, and natural rubber.

A contact (2) made of foam is fixed and held on a rigid substrate (3), and a predetermined force (N) is applied to the substrate (3) to sandwich the hair bundle (1) from above and below. Make contact while doing so.

Then, the hair bundle (
Measure the force (T) required when pulling 1) at a constant speed in its longitudinal direction. Since the tensile force (T) is in a relationship corresponding to the frictional force (F) between the hair and the contactor (2), the degree of surface friction of the hair can be obtained numerically.

FIG. 3 shows one modification, in which the contacts (2) made of the foam are attached to the outer periphery of the rotating body (4) made of a rigid body.
) was fixed and the contactor (2) was brought into contact with the hair bundle (1) held at a constant tension, and the frictional force (F) with the hair was measured by the rotational resistance force of the rotating body (4). It is something.

[Brief explanation of drawings]

The drawings show embodiments of the invention. FIG. 1 is a sectional view schematically showing the vcgl, FIG. 2 is a central sectional view of FIG. 1, and FIG. 3 is a view similar to FIG. 111 showing a modification. (1)... Hair bundle (2)... Contact (3)
...Substrate (4) ...Rotating body patent applicant
Shiseido Co., Ltd. Figure 1 Figure 2

Claims (1)

[Claims] (1) While a contact made of foam is brought into contact with the hair bundle with a constant force, the hair bundle and the contact are moved relative to each other, and the degree of friction of the hair is measured based on the force required for the movement. A method for measuring the feel of hair.