JPH038770B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an improved method for producing artificial hair for direct hair transplantation onto human skin.

(Structure of conventional example and its problems) In recent years, artificial hair for direct hair transplantation to human skin has been developed and put into practical use. In particular, various improvements have been proposed regarding the shape of the hair root in order to increase the retention rate of transplanted hair.

As one of these methods, a method was proposed in which one end of a single synthetic resin fiber is wound to form a loop and tied tightly to provide a hair root (Utility Model Application Publication No. 123089/1989).

This method is excellent in that it allows the formation of hair roots without complex processes such as plastic processing, but the artificial hair manufactured using this method is easy to untie if it is made of a single layer, and if it is made of double or more layers. With a tight knot, the knot becomes too thick compared to the root of the hair and the wound becomes larger when the hair is transplanted.As a result, the rate of hair shedding immediately after the transplant is high, and there is a risk of inflammation on the skin after the hair has settled. If the hair becomes suppurated, it must be pulled out immediately, but if it is pulled out after the loop-shaped hair root has penetrated and the subcutaneous tissue has developed, it will break at the base of the hair root knot and the hair root will remain within the skin, causing medical problems. There were drawbacks that caused various problems.

In order to eliminate such problems, the present inventor proposed in a previous application (Utility Model Application No. 142524/1983) that the peeling strength could be increased by thermally bonding the intersections of hair roots wound in a loop using high-frequency point welding technology. Therefore, when the implanted artificial hair is pulled out with a strength above a certain level (hereinafter referred to as the critical peeling strength), the junctions at the intersections are separated and the loop-shaped hair root becomes a single thread that separates from the skin. He proposed a manufacturing method for artificial hair that can be pulled out without leaving any hair roots inside.

Normally, when hair is styled with a comb, the load applied to the hair is 90 to 100 g, so it is necessary to manufacture artificial hair with a peel strength of 100 g or more.

It is difficult to consistently produce artificial hair fused at the above-mentioned single-point intersection with an average peel strength of 100 g or more. In order to obtain a product with a peel strength higher than this, it is necessary to increase the pressure applied by the heating device to achieve strong fusion. However, although the peel strength increases if the pressure applied by the heating device is increased, increasing the pressure applied makes it easier to break from the fused portion. (Hereinafter, the limit strength at which a single fiber breaks when pulled in its longitudinal direction is referred to as breaking strength.) This is because the crossing single fibers bite into each other, creating a constriction in each single fiber, and This is because the orientation of the fibers is disturbed, weakening the strength in the longitudinal direction of the fibers, and the force is concentrated at the corners of the constrictions, making them easier to break.

In the cited example of artificial hair fused at a single point intersection, it is 100
In order to obtain a peel strength of 40 g or more, strong fusion must be achieved with a pressure of 40 g or more. As a result, the breaking strength of the base of the hair root of the artificial hair obtained is
The weight of the hair decreases to 100 to 120 g, and when the hair is forcibly pulled out, most of it is cut off from the root of the hair, making it unsuitable for commercial value.

(Objective of the Invention) The present invention solves the above-mentioned drawbacks of conventional artificial hair, has a high fixation rate, and has a loop-shaped hair root at the base of the hair root so that the hair root is not cut when forcedly removed and comes out as a single thread. An object of the present invention is to provide a method for manufacturing artificial hair for hair transplantation at low cost and with good yield, and which has an appropriate critical peel strength at the intersection point.

(Structure of the Invention) The method for producing artificial hair of the present invention includes the steps of winding artificial hair made of a single fiber of thermoplastic synthetic resin once around a rod-shaped jig to form a loop, and One end of the fiber and the other end of the filament that will form the hair shaft are entwined and twisted once to form an S-shaped joint at the base of the loop, and the filament that is to form the hook portion is twisted. A step of holding the fibers and the single fibers that are to form the hair shaft with a support so that they are spread out at a certain angle, and heating the above-mentioned bonded portion while applying pressure with a flat heating section of a heating device for fusing. This method is characterized by a process of heat-sealing and fixing only the two intersections where the single fibers of the hook part and the joint part of the hair shaft intersect.

The thermoplastic single fibers used in the present invention may be of polyester, polyethylene, polypropylene, or any other thermoplastic fiber that is less toxic to the human body.
Polyester single fibers having a diameter of 0.06 to 0.1 mm made by melt-spinning a linear polymer of polyethylene terephthalate are particularly preferred because they have extremely low toxicity and high heat resistance, and have a texture similar to hair.
In order to thermally fuse only the two points of intersection where the single fibers of the hook part and the single fibers of the hair shaft intersect, heat is applied while applying pressure with the flat heating section of the heating device for fusing, as described above. , the contact force at that time is
It is necessary to pressurize and heat 20 to 40 g at a heating temperature of 180 to 260°C for 0.1 to 3.0 seconds.

As a heating device for fusion, any device such as a resistance electric heating device, a high frequency heating section, or an ultrasonic heating section may be used as long as the heating temperature, heating time, pressure contact force during heating, etc. can be freely controlled. In the case of a heating device, it is easily affected by the ambient temperature, so it is necessary to work while maintaining a constant ambient temperature of the indoor hot water or workbench.

In addition, in the case of a high-frequency heating device, in order to obtain the above temperature, a device with a power of 2KW or less must be used at a frequency of 1 to 100MHz.
Just heat it for 0.1 to 1.0 seconds.

In the case of an ultrasonic heating device, the purpose can be achieved by heating at a frequency of 1.5 to 10KHz for 0.1 to 0.5 seconds with a device of 1KW or less. In addition, ultrasonic heating equipment has excellent fine control functions, and
Since it has an excellent ability to selectively heat only a limited heating area, it is most preferable as a heating means of the present invention.

Next, an embodiment of the method for producing artificial hair for hair transplantation according to the present invention will be described with reference to the drawings.

As shown in Fig. 1, a single fiber 1 cut to an appropriate length is held at both ends and wrapped around a rod-shaped jig 21, and the intersections of the artificial hair on both sides are fixed in a twisted state, and the intersections are fused. A wearable heating device 50, for example, a resistance electric heating device, a high frequency heating device, an ultrasonic heating device, etc., heats the two intersections 4, 4 by instantaneously heating while applying pressure with the flat bottom heating part 23 of the heating rod 22. The bonded portion 6 is formed by heat-sealing only the space between .

However, the peeling strength of the joint 6 of the artificial hair of the present invention is defined as the degree to which the fused intersections are peeled off so that the hair roots do not break and come out as a single thread when the hair is forcibly removed after hair transplantation. It is necessary to control the degree of fusion so that the critical peel strength is 100 to 220 g, preferably 140 to 200 g against the load in the longitudinal direction of the trunk.

For that purpose, the heating part 2 of the heating device 50 for fusion
3. Heat the joint at 180 to 260℃ while applying pressure of 20 to 40g.
It is necessary to heat instantly for 0.1 to 3.0 seconds.

Next, an example of an apparatus suitable for performing such processing will be described.

As shown in FIGS. 2 and 3, a cylindrical sliding body 29 is provided on the lower surface of the work table 20 having a bar-shaped projection 21, and is slidably attached to a cylinder 27 provided on a base 28. It is inserted.

A spring 26 is interposed between the lower surface of the work table 20 and the cylinder 27 to bias them in opposite directions. An adjustment groove 3 is provided on the side wall of the sliding body 29.
A pin portion 33 at the tip of a screw 32 screwed into the side wall of the cylinder 27 projects into the adjustment groove 30 to limit the vertical movement distance of the sliding body 29.

On the other hand, a sliding ring 37 of a support arm 37 is fitted into a column 42 that projects from the base 28 so as to be vertically slidable. Further, adjustment rings 43 and 44 for regulating vertical movement of the support arm 37 are fixed to the column 42 by screws 40. In addition, the support arm 37 is
It is constantly pulled upward by a spring 45, one end of which is fixed to 2.

A support ring 38 for holding the heating device 50 by a screw 39 is provided at the other end of the support arm 37 .

Further, a rotary cam 47 rotated by a handle 48 is in contact with the support arm 37, and the rotation of the rotary cam 47 causes the support arm 37 to move up and down.

Inside the heating device 50, there is a heater 54 for resistance electric heating.
is built-in. The joint portion of the artificial hair is pressurized and heated by the planar heating portion 23 formed on the lower surface of the heating rod 22 which is in thermal contact with the heater 54 . The heater 54 is connected to the power source 51 by a cord 55, and a foot switch 52 and a timer device 53 are provided in the circuit.

In the case of a high-frequency heating device, as shown in FIG.
A flat heating section 23 is provided on the lower surface of the heating presser 61. One cord 64 connected to the high-frequency heating device 63 is guided to the heating presser 61, and the other cord 65 is connected to a part of the work table 20. Also included in the circuit is a foot switch 25 and a timer device 5.
3 is provided.

Further, in the case of an ultrasonic heating device, as shown in FIG. 5, an ultrasonic vibrator 71 made of a ceramic piezoelectric material is built into the heating device 50. Electrodes 72, 7 provided on the upper and lower surfaces of the ultrasonic vibrator 71
3 is connected to an ultrasonic generator 75 by a cord 55, and a foot switch 25 and a timer device 53 are provided in the circuit. Further, a heating horn 74 is fixed to the lower end of the ultrasonic vibrator 71,
A planar heating section 23 is provided on the lower surface of the heating horn 74 .

Now, in order to manufacture the artificial hair of the present invention using such a device, first, in the device shown in FIG.
Hold the grip 49 and rotate the handle 48 upward to rotate the rotary cam 47 and move the support arm 37 upward. Then, as shown in FIG. 3, the artificial hair 1 is wrapped around the rod-shaped protrusion 21 on the work table 20, twisted once, and both ends of the artificial hair 1 are inserted into the slits 36 of the stops 34 and 35 of the fixed table 24. Fix it with. Next, when the handle 48 is rotated downward and the support arm 37 is moved downward by the cam 47, the heating part 23 of the heating device 50 presses the S-shaped intersection of the artificial hair 1, and the spring 26 work table 20 against
Press down. At this time, by adjusting the strength of the spring 26 and the moving distance of the support arm 37, that is, the moving distance of the work table 20, the desired pressing force, that is, a pressing force of 20 to 40 g, can be achieved at the intersection of the artificial hair 1. 4 and 4'.

Then, when the foot switch 52 is closed, the heater 54 is heated and the flat heating portion 23 at the tip of the heating rod 22 heats the intersections 4 and 4' of the artificial hair 1. The heating time is set in advance by setting the timer device 53 from 0.5 to
By setting the time to 3.0 seconds, it is possible to fuse only the intersections 4 and 4' of the artificial hair.

In the case of the high frequency heating device shown in FIG. 4, the frequency of the high frequency generator 63 is set to 1 to 100 MHz,
If the timer device 53 is set to 0.1 to 1.0 seconds, since the artificial hair is a dielectric material, only the intersection portion of the artificial hair pressed against the flat heating part 23 of the heating presser 61 is applied with the high frequency electric field. Therefore, high-frequency dielectric heating is performed and thermal fusion is performed.

In the case of the ultrasonic heating device shown in FIG. The vertical vibration of the frequency in the sonic range is applied to the joint part of the artificial hair through the heating part 23 of the heating horn 74, and the intersection part of the artificial hair is heated by the heat generated by internal friction, making it possible to obtain the desired joint part 6. can.

Artificial hair 1 of the present invention formed in this way
As shown in FIG. 6, the hair shaft 7 is provided with a loop-shaped portion 3 at the tip thereof, and the hook portion 5 projects at a certain angle with respect to the hair shaft 7, and forms the hair shaft 7. Only the two intersection parts 4 and 4' where the monofilament intersects with the monofilament that forms the hook part 5 has a heat-sealed joint 6, and the maximum outer diameter of the loop-shaped part 3 is 0.8~1.5mm, minimum outer diameter is 0.6~
It is extremely minute, with a length of 1.3 mm and a hook portion 5 of 0.3 to 1.5 mm. Further, the hole 9 formed inside the loop-shaped part 3 is for inserting the forked part 14 at the tip of the hair transplant needle 13 during hair transplantation, and is also for preventing the artificial hair from falling off after the hair transplantation. It functions as follows.

That is, as shown in FIG. 7, the forked part 14 at the tip of the hair transplant needle 13 pinches the lower side of the loop-shaped part 3 of the hair root part 2, breaks through the epidermis 10 and dermis 11, and penetrates deep into the subcutaneous tissue 12. If you push in the hair root part 2 and gently pull out only the hair transplant needle 13, the hook part 5 of the hair root part 2 will be removed.
protrudes at a certain angle with respect to the hair shaft 7, which prevents the hair from returning, and the hair root 2 is anchored in the subcutaneous tissue 12, as shown in FIG.

After a few days, when the subcutaneous tissue in the hole 9 of the hair root 2 recovers and the tissue around the artificial hair becomes fibrillated due to a physiological reaction, the hair root 2 is completely retained by the subcutaneous tissue 12. This will prevent the implanted artificial hair from falling off.

In particular, the thickness of the joint part 6 of the artificial hair 1 of the present invention is extremely thin compared to the hair root part obtained by other methods, so damage to the skin tissue that occurs during hair transplantation is small, and the artificial hair does not fall off immediately after hair transplantation. It has the characteristics that the hair retention rate is extremely high because it is small and the tissue recovers quickly.

(Effects of the Invention) The present invention involves entangling and twisting one end of a single fiber to form a hook portion and the other end of a single fiber to form a hair shaft, and intertwining each other in an S-shape at the base of the loop. A weld joint is formed, and this joint is heated while being pressurized by the flat heating part of the heating device for fusing, so that only the two intersection points where the single fibers of the hook part and the single fibers of the hair shaft intersect are heated. By heat-sealing and fixing, it is possible to easily obtain the required minimum peel strength of 100 g or more, so the implanted artificial hair will not fall off when hair is styled with a comb. Furthermore, the fusion conditions using the fusion heating device were set to 180 to 260°C, a pressure of 20 to 40 g, and a time of 0.1
By setting the time to ~3.0 seconds, it is possible to constantly produce artificial hair with a loop-shaped hair root with a critical peeling strength of 100 to 220 g, so even if suppuration or inflammation occurs after hair transplantation, , If you pull out the transplanted artificial hair with a force of 100g or more, it will reach intersection 4,
The fused portion between 4' can be peeled off and easily pulled out as a single thread. Furthermore, the breaking strength of the root of the loop-shaped hair root produced under these conditions was 300 g.
Since the above is maintained and the difference from the above peel strength is large, there is no possibility that when the hair root is forcibly pulled out, it will break at the base of the hair root and the hair root will remain in the skin tissue of the human body and have an adverse effect on the human body.

Next, the embodiments of the present invention will be described as follows.

1 Single fibers of thermoplastic synthetic resin are obtained by drawing and spinning polyester resin, preethylene resin, or polypropylene resin and have a diameter of 0.06 to 0.1 mm.
Method 2 for producing artificial hair for flocking according to claim 1, characterized in that a single fiber of is used.Claim 1, characterized in that a resistance electric heating device is used as a heating device for fusing. A method for producing artificial hair for hair transplantation as described in .

3. The method for producing artificial hair for hair transplantation according to claim 1, characterized in that a high-frequency heating device is used as the heating device for fusing.

4. The method for producing artificial hair for hair transplantation according to claim 1, characterized in that an ultrasonic heating device is used as the heating device for fusing.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of a device suitable for use in the artificial hair manufacturing method of the present invention, with Figure 1 being a partially enlarged perspective view of the device, and Figure 2 being a side view of the entire device. 3 is a partially enlarged plan view of the device shown in FIG. 2, FIG. 4 is a sectional view showing a portion of the high-frequency heating device of another embodiment, and FIG. 5 is an ultrasonic heating device of still another embodiment. 6 is a plan view of the artificial hair produced according to the present invention; FIG. 7 is an explanatory diagram showing the artificial hair transplantation method according to the present invention; and FIG. 8 is the implanted artificial hair. It is an explanatory view showing a state. 1...Artificial hair, 2...Hair root part, 3...Loop-shaped part,
4, 4'...intersection, 5...hook part, 6...joint part,
13... Flock needle, 20... Work table, 21... Rod-like projection, 22... Heating rod, 37... Support arm, 47... Cam, 50... Heating device, 52... Foot switch, 5
3...Timer device, 54...Heating wire, 63...High frequency generator, 71...Ultrasonic vibrator, 75...Ultrasonic generator.

Claims (1)

[Claims] 1. The process of winding artificial hair made of single fibers of thermoplastic synthetic resin once around a rod-shaped jig to form a loop part, one end of the single fiber to form the hook part, and the single fiber to form the hair shaft. The other end is entwined and twisted once to form a joint in which the fibers are intertwined in an S-shape at the base of the loop part, and the single fibers to form the hook part and the single fibers to form the hair shaft are A process of holding the parts with a support so that they spread out at a certain angle, and then heating the above-mentioned joint with a flat heating part of a fusion heating device at a temperature of 180 to 260°C and a pressure of 20 to 40 g.
The process consists of heat-sealing and fixing only the two intersection points where the single fibers that will form the hook portion and the single fibers that will form the hair shaft intersect by applying heat and pressure for 0.1 to 3.0 seconds. A method for producing artificial hair for hair transplantation, characterized by: