CN1212089C - How to make brushes - Google Patents

Abstract

The invention provides a manufacturing method for a brush which manufactures a brush with high quality in which fall-out resistant strength of a bristle bundle is high, resin leakage generated when filling the resin, and the distortion and disorder of the bristle bundle are restrained, with few deformation and warp of an implantation base part. The manufacturing method for the brush comprises a bristle bundle insertion process inserting the bristle bundle 3 into implantation holes 24 formed on an implantation base part 22 having a plurality of implantation holes 24, a heating process forming the end parts 31 of the bristle bundle 3 protruding from the implantation holes 24 into molten lumps 32 by heating, and a covering process covering the molten lumps 32. The molten lumps 32 are formed by heating the peripheral part of the opening 240 of the implantation holes 24 and the end parts 31 of the bristle bundle 3 by using a non-contact heat source, and the molten lumps 32 are bonded to the peripheral part of the opening 240 of the implantation holes 24 by fusion.

Description

How to make brushes

technical field

The present invention relates to a method for the manufacture of brushes, in particular toothbrushes.

Background technique

As the prior art related to the manufacturing method of the toothbrush using the hair-planted base having the hair-planted holes, for example, the technology described in JP-A-9-182632 is known. In this technique, one end of the hair bundle protruding from the hair-planting hole of the hair-planting base is melted to form a fused block, and then the fused block is covered to form a hair-planted part.

But, the manufacture method of this toothbrush will all melt one end of a plurality of hair bundles, forms the fusing block, then compresses the formed fusing block, makes this fusing block and the hair-planting base tightly bonded. That is: it is not considered to adapt to the shape of one end of the hair bundle protruding from the hair-planting hole to form a high-precision fusion block.

Therefore, when such a manufacturing method is adopted, especially in the case of flocking of bristle bundles having different cross-sectional sizes and shapes, and in the case of manufacturing brushes in which the positions of the ends of the bristle bundles protruding from the flocking holes are different from each other. , it is difficult to melt the protruding ends of the hair bundles equally. Like this, molten mass can not fill up around the whole hair-planting hole, and when carrying out the resin filling mentioned later, resin can leak out from the hair-planting hole, and molding is not good.

In addition, the melting degree of each hair bundle is not uniform, so the size of the fusion block is uneven, and the small hair bundles of the fusion block can be pulled out with a slight force.

In addition, because the fused mass needs to be pressed tightly to make it tightly bonded, the hair bundle is subjected to an excessive load. In addition to easily distorting or messing up the hair, the fused mass and the base of the planted hair that are tightly bonded by pressing will shrink after heating. , causing problems such as bending and other deformations on the final product.

On the other hand, there is known a method for producing a toothbrush described in USP4441227 as a technique using laser light in the bristle fusion method. When using this technique, a laser is used to make the front end of each hair bundle (filament) into a circle. In addition, the filaments can be bonded to each other along the length direction using a laser. However, there is no description in this document of fusing one end of the hair bundle with a laser to form a fused mass and a pattern of laser irradiation.

Similarly, the brush manufacturing method described in JP-A-2000-287755 describes a method of melting a plurality of bristle ends exposed from a resin bristle support with a heat source such as a laser to form a large fused portion, However, the specific irradiation method of the laser is not described.

Contents of the invention

Therefore, the object of the present invention is to provide a hair bundle with high pull-out strength, which can prevent poor molding caused by resin leakage when filling resin, can suppress twisting or disorder of the hair bundle, and deformation of the base of the hair-planting, and can produce high-quality hair bundles. A brush manufacturing method for a brush.

In order to achieve the above object, the present invention provides a method of manufacturing a brush, which has: a hair bundle insertion process of inserting a hair bundle into the hair-planting hole of a hair-planting base having a plurality of hair-planting holes; One end of the hair bundle, forming a thermal processing process of a fused mass; and a covering process of covering the above-mentioned fused mass, characterized in that, the opening peripheral edge of the above-mentioned hair-planting hole and one end of the above-mentioned frizz are heated with a non-contact heat source to form a fused mass, And, this fused block is fusion-bonded to the opening peripheral edge of the above-mentioned hair-planting hole.

Description of drawings

Fig. 1 is a diagram schematically showing a molding die and a toothbrush body used in one embodiment of the brush manufacturing method of the present invention; Fig. 1 (a) is a sectional view of a molding die; Fig. 1 (b) is a toothbrush Longitudinal section view of the body.

Fig. 2 is the figure that schematically represents the front end structure of the toothbrush body of same embodiment; A floor plan of the main part.

Fig. 3 is a cross-sectional view schematically showing a main part of a laser processing step after hair transplantation of a hair bundle in the same embodiment, and is a view showing a state of irradiation with a laser beam.

Fig. 4 is the figure that schematically represents laser beam scanning form; Fig. 4 (a), Fig. 4 (b) are the figures representing the cross-sectional shape of hair bundle, and Fig. 4 (c), Fig. 4 (d) are linear scanning The figure of the situation, Fig. 4 (e), Fig. 4 (f) is the figure of the situation of ring-shaped scanning.

Fig. 5 is a cross-sectional view schematically showing the fixed bonding state of the boundary surface between the fusion mass and the opening peripheral edge of the hair transplantation hole.

Fig. 6 schematically shows that along with the laser beam scanning irradiation of Fig. 4 (c), the explanatory drawing of forming fusion block and fusing process; An explanatory diagram (partial cross-sectional view) of the state of fixed adhesion by mutual fusion to form a boundary surface.

Fig. 7 is a cross-sectional view schematically showing a main part of a fused mass covering step in the same embodiment.

Detailed ways

Hereinafter, the brush manufacturing method of this invention which is a preferable embodiment is demonstrated based on embodiment to which the manufacturing method of the toothbrush is applied, referring FIGS. 1-7.

In the manufacturing method of the toothbrush of this embodiment, first, as shown in FIG. As shown in FIG. 1( a ), in the molding process of the toothbrush body 2 , a cavity 11 corresponding to the shape of the toothbrush body 2 having a flocking base 22 and a molding die 10 are used. The molding metal mold has a resin injection passage 12 opening into the cavity 11 . The molding metal mold 10 is installed on the injection molding machine (not shown in the figure), and under a given injection molding pressure, from the resin injection channel 12, in a molten state, the thermoplastic resin (not shown in the figure) is injected Into the cavity 11, the metal mold is separated after cooling.

In addition, for the toothbrush body 2, a common thermoplastic resin used in a conventional toothbrush body can be used without any particular limitation. As the thermoplastic resin, polyolefins such as polypropylene, polycarbonate, polymethyl methacrylate, polyester such as polyethylene terephthalate, acrylonitrile-styrene copolymer, acrylonitrile A butadiene-styrene copolymer, etc. These thermoplastic resins can be used singly or in plural by appropriately selecting them.

As shown in FIG. 2 , by the toothbrush manufacturing method of the present embodiment, a flat flocking base 22 having a concave portion 21 on the back is formed on the front end 20 of the toothbrush body 2 .

Generally, the hair-planting part of the toothbrush with good operability in the oral cavity (the toothbrush head is divided into a plastic resin part) preferably has a thickness t1 of 5.5 mm or less. If it is thinner, the operability in the oral cavity can be improved, but in order to ensure the strength of the toothbrush, To keep the hair bundle stably on the hair-planting base 22, it is preferable that the thickness t1 of the hair-planting part is in the range of 3-5 mm.

Considering the relationship with the above-mentioned thickness t1 and the extent to which the fused mass 32 is covered, the depth d of the concave portion 21 is preferably 1 to 4 mm, and is preferably 1 to 2 mm if the operability of the toothbrush is important.

In addition, the greater the thickness t2 of the bottom surface of the concave part 21, the easier it is to form and the greater the bending strength. However, considering the operability and practicality of the toothbrush, t2 is preferably 1-4 mm, preferably 1.0-2 mm.

On the flocking base 22, a flocking hole 24 that passes through the lower surface 23 into the recess 21 is formed. In the present embodiment, the hair-planting holes 24 having different sizes and shapes are respectively formed at the front end, the center, and both sides. In addition, as the shape of the tuft-planting hole 24, besides a substantially circular shape, a substantially oblong shape, a substantially elliptical shape, various triangular shapes, and various rectangular shapes can be appropriately selected. The interval between the hair-planting holes 24 should be at least more than 0.3mm, preferably more than 0.5mm. If the interval is too narrow, the insertion of the hair bundles into the hair-planting holes will be hindered, the strength of the hair-planting base 22 will be reduced, and it will be difficult to secure a resin flow path when the hair-planting base 22 is molded.

The upper opening peripheral edge 240 of the hair-planting hole 24 expands upwards to form a cone. The angle α of the opening edge 240 is preferably 20-120°, more preferably 30-50°. When the angle α is set in a preferable range, the hair transplantation becomes easier, the strength of pulling out the hair bundle increases, and unevenness is easily formed on the boundary surface between the fusion mass and the hair transplant base.

The outer peripheral wall 21a of the recessed portion 21 preferably extends over the entire periphery. In this way, when the resin is filled into the concave portion 21 described later, the bonding area between the resin for filling and the concave portion can be increased, and the bonding strength can be improved. In addition, as will be described later, when the one end 31 of the fused bristle bundle 3 forms the fused mass 32 , it is possible to prevent the fused mass 32 from flowing out to the outside of the flocking base 22 .

In the toothbrush manufacturing method of this embodiment, the above-mentioned bristle bundle 3 (see FIG. 3 ) can be made of common materials conventionally used for bristles of toothbrushes, such as polyamide such as nylon, and polyethylene terephthalate.

The method of inserting the hair bundles 3 into the hair implantation holes 24 is not particularly limited, and for example, a method of inserting cut hairs in bundles of a predetermined number can be used.

Next, in the thermal processing step, heat one end 31 of the hair bundle 3 protruding from the opening peripheral edge 240 of the tufting hole 24 and the tufting hole 24 with a non-contact heat source (not shown), and melt the one end 31 , Form the fusing block 32, meanwhile, make the opening peripheral edge 240 of the fusing block 32 and the hair-planting hole 24 be fused and bonded, and the two are fixedly bonded without pressing.

As the above-mentioned method of forming a molten lump using a non-contact heat source, from the viewpoint of forming each molten lump of a necessary shape with high precision and high efficiency, a method of irradiating with a laser beam emitted from a given laser oscillator, and The method of intensively irradiating with light emitted from a light source such as an iodine-tungsten lamp is preferable.

Hereinafter, it demonstrates based on embodiment of the method of irradiating with a laser beam.

As shown in FIG. 3 , in the processing step of the present embodiment, a laser beam is irradiated on one end 31 of a plurality of the above-mentioned hair bundles 3, and the one end 31 is melted to form a cross-sectional area larger than the opening peripheral edge 240 of the above-mentioned hair-planting hole 24. Large fused mass 32 .

The size of the fusion block 32 is preferably more than 1.05 times the diameter of the flocking hole, so as to ensure the desired pull-out strength of the hair bundle 3 . When the distance between the bristle bundles 3 is narrow, the fused lumps are connected to each other, so that the pull-out strength of the bristle bundles becomes higher. When the fused mass 32 is too large, the pull-out strength of the hair bundle is high, but it takes a certain time to form the fused mass, and the fused mass 32 will protrude from the recess 21, which will form an obstacle during resin filling described later.

In this embodiment, according to the light path from the laser oscillator to the laser beam of the imaging lens, according to the irradiation pattern (scanning pattern) recorded in memory in advance according to the cross-sectional shape of each hair bundle 3, the controller can servo Control the angle of the reflective mirror arranged in the above-mentioned optical path, and control the position of the focusing lens at the same time, so that the laser beam emitted from the imaging lens is correctly scanned and irradiated on one end 31 of each hair bundle 3 .

The thickness (beam diameter) of the above-mentioned laser beams can be appropriately set according to the cross-sectional shape, number, and hair-implantation positions of the hair bundles 3 .

In the present embodiment, in order to scan and irradiate each hair bundle 3, the laser beam diameter is preferably 0.1 to 4 mm. In addition, when the energy of the laser beam is increased to form the fused mass 32 on each hair bundle 3 in a fine scanning manner, the diameter of the laser beam is preferably 0.1 to 1 mm.

In the above-mentioned laser beam irradiation pattern, according to the length of the hairs of each of the above-mentioned hair bundles 3, the cross-sectional size of each hair bundle 3, the hair-planting position on the hair-planting base 22 of each hair bundle 3, for the hair-planting base 22 of each hair bundle 3 The above-mentioned angle (θ), the hair density of each hair bundle, the hair type (thickness, color (light absorption rate)) of each hair bundle, and the shape of the tip, etc., set the most suitable parameters (diameter of the irradiation point, irradiation heat, irradiation Time, scanning speed, scanning distance, etc.), scanning and irradiation corresponding to each hair bundle can form a good fusion block.

For example, in the hair bundle 3 having the oblong or horseshoe-shaped cross-sectional shape shown in Fig. 4 (a), (b), the irradiation point according to the laser beam as shown in Fig. Diameter, in the form of linear scanning at a given pitch (P), or as shown in Figure 4(e), (f), according to the diameter of the irradiation spot of the laser beam, at a given pitch, from the center to the outer ring Shape scanning, etc., can get the most suitable melting conditions.

The scanning pitch of the laser beam is determined by the irradiation spot diameter of the laser beam, scanning speed or output, and is preferably 0.05 to 2 mm.

In addition, the scanning speed of the laser beam is preferably 60 to 800 mm/sec (output 12 to 50 W) from the viewpoint of securing the necessary heat capacity and melting time for forming the above-mentioned fused mass 32 .

From the viewpoint of obtaining a high output and realizing pulsed, the irradiation pulse of the above-mentioned laser beam is preferably 1 to 10 kHz. The output of the above-mentioned laser beam is preferably 10 to 100 W from the viewpoint of simplifying the equipment corresponding to the scanning shape of the laser beam.

In this embodiment, a small-diameter laser is projected onto each hair bundle, and the irradiation parameters are changed to form a fused mass under the most suitable melting conditions.

For example, as one end 31 of the hair bundle 3 shown in Figure 3, compared with other hair bundles, the form with a large amount of protrusion or the large form of the hair bundle cross-sectional area changes the irradiation time, parameters such as scanning distance, and can be scanned and irradiated. When more heat is added, a molten mass is properly formed.

In addition, for the form in which the protruding amount of the hair bundle 3 is small and the cross-sectional area of the hair bundle is small, contrary to the above, the parameters should be changed to reduce the heat added during scanning irradiation. In particular, at one end 31 of the hair bundle 3, the form (31a) in which the protruding amount of each hair changes, scans and irradiates the high part once, and then repeats scanning and irradiates all the one end 31a, which can well form a highly uniform fused mass. 32.

As mentioned above, in addition to repeating the laser beam scanning irradiation, in order to concentrate the heat on the high part of the hair bundle 3 (the part with a lot of melting), the scanning pitch can be partially narrowed, the scanning speed can be partially changed, and the melting The heat is concentrated on the necessary parts, etc., and the characteristics of the laser scanning method can be fully utilized to obtain the most suitable method for forming molten lumps.

Hereinafter, it will be specifically described to heat one end 31 of the above-mentioned hair bundle 3 and the opening peripheral edge 240 of the above-mentioned hair-planting hole 24 with a laser beam to form a fusion block 32, and to melt the fusion block 32 and the opening peripheral edge 240 of the hair-planting hole 24. The problem.

In this embodiment, when the one end 31 of the bristle bundle 3 is fused, a part of the one end 31 has a very high temperature, has high fluidity, and is in a state closely adhered to the flocking base 22 to form a fused mass 32 . In this way, as shown in FIG. 5 , fusion bonding can be achieved without pressing the entire surface of the fusing block 32 and the opening peripheral edge 240 of the tufting hole 24 . In this way, resin can be prevented from leaking from between the tufting holes 24 and the hair bundles 3 when the resin is filled to be described later.

In addition, since the fused mass 32 is formed without compaction, there is no stress on the bristle bundle 3, and the bristle bundle will not be twisted or disordered, and a high-quality bristle bundle state can be maintained. In the non-contact heat source, compared with the hot air method, the laser beam does not generate stress on the hair when forming the molten mass, which is good.

In addition, when forming a fused block, the laser beam is used to heat only the molten part, and the part that does not need to be heated is not heated. Therefore, compared with the hot air method, the deformation or bending of the base of the bristle is small, and an extremely small toothbrush can be manufactured.

In this embodiment, when forming a fused mass, as shown in FIG. 4( c ), the laser beam is scanned at a constant pitch to irradiate one end 31 of the hair bundle 3 and the hair transplantation hole 24 where the hair 3a is assembled together. A portion of the peripheral edge 240 of the opening.

Like this, as shown in Figure 5, one end 31 of the flock bundle and the opening peripheral edge 240 of the tufting hole 24 are mutually fused to form a fusion block 32, and, on the boundary surface 32a of the fusion block 32 and the opening peripheral edge 240, a concavo-convex shape is formed , the materials are wound together, so that after the boundary surface 32a cools and shrinks, there is no gap on the boundary surface, and a reliable close bonding state is formed, that is, the opening peripheral edge 240 of the fusion block 32 and the hair-planting hole 24 can be fixedly bonded. connected status.

Specifically, as shown in A-A and B-B of FIG. 4( c ), the bristle bundle 3 having an approximately oblong cross-section is cross-cut and irradiated by scanning with a laser beam.

In this case, the hair bundle 3 and the base opening peripheral edge 240 are irradiated with a laser beam whose irradiation spot diameter is smaller than that of the hair bundle 3 by scanning each other to partially melt them.

As shown in FIG. 6( a ), the shape in which the hair bundle 3 and the base opening peripheral edge 240 are fused to each other is first irradiated from the base opening peripheral edge 240 . At this time, a part of the opening peripheral edge 240 is brought into a molten state 240 a by irradiating a laser beam with a small spot diameter.

Next, a part (3b) of the hair on the outer peripheral edge of the hair bundle 3 is melted, (Fig. 6(b)), and the scanning irradiation is continued with the laser beam.

Next, the opening peripheral edge 240 of FIG. 6(c) is melted with a laser beam (240b). Thereafter, the scanning irradiation described above is repeated to melt the remaining portion at one end of the hair bundle to form a fused mass 32 ( FIG. 6( d )). As shown in FIG. 4( c ), the irradiation pattern at this time can be in the form of alternating and close scanning, irradiating the peripheral edge 240 of the opening and the hair bundle 3 with the laser beam. Therefore, as shown in Fig. 6 (a-d), the boundary 32a of opening peripheral edge 240 and hair bundle 3 forms a concavo-convex shape, and the flocking base 22 and the hair bundle 3 are partially fused to each other, and after cooling and contraction, the boundary surface 32a remains closely bonded state, which is the fixed bonding state.

Like this, because one end 31 of hair bundle 3 and the opening peripheral edge 240 of tufting hole 24 melt mutually, form fusion block 32, and, form concavo-convex shape on boundary surface 32a, make finger material intertwine, therefore by presently used The material with poor adhesiveness in the molten state can be combined with the material of the flocking base 22 and the hair of the bristle bundle 3, and the bristle bundle can be fixedly bonded to the base.

For example, polypropylene resin (solubility parameter (SP value) = 8.0) and polyethylene terephthalate (solubility parameter (SP value) = 10.7) are mostly used on the toothbrush body, and the hair materials of the hair bundle 3 are mostly Nylon was used (solubility parameter (SP value) = 13.6). With such a material combination whose solubility parameter difference is as large as 1 or more, it is difficult to bond with heat. Because of this, after the fusion block is formed, the vibration in the conveying process will mess up the hair bundles of the flocking, and when the resin is filled, the flow pressure is received from the side, so that the fusion block is shifted, and the flock and the base flocking part gaps from which resin can leak.

However, adopt the manufacturing method of the present embodiment, as mentioned above, because one end 31 of the hair bundle and the opening peripheral edge 240 of the tuft hole 24 fuse each other, open into a molten mass 32, and form a concavo-convex shape on the boundary surface 32a, so that the material Therefore, even if the solubility parameter difference between the material used for the toothbrush body and the material used for the hair of the bristle bundle is more than 2, the fusing block 32 and the opening peripheral edge 240 of the tuft hole 24 can be well fixed.

In this way, it can be prevented that when the resin is filled into the back concave portion described later, the filling pressure causes the melting block 32 to deviate, and the close adhesion between the melting block 32 and the opening peripheral edge 240 of the hair planting hole 24 is damaged, and the resin can also be prevented from flowing out of the hair planting hole 24. Leakage between tuft 3.

When the cross-section of the boundary surface is enlarged and observed, the fixed bonding state of the fusion mass 32 and the opening peripheral edge 240 of the tufting hole without gaps can be confirmed (see FIG. 5 ).

From the point of view that the filling property of the resin will not be damaged when filling the resin described later, the shape of the fixed fused mass 32 should be: the thickness f (see FIG. 3 ) of the fused mass 32 is preferably 0.2 to 3 mm, preferably 0.2～1mm. In addition, in order not to impair the filling property of the resin, the thickness of the resin filling flow path (see d-f in FIG. 3 ) is 0.2 mm or more.

Utilize the toothbrush manufacturing method of the present embodiment, carry out thermal processing step with laser beam, irradiate the rear end 31 of above-mentioned bristle bundle 3 with above-mentioned laser beam, make fusing block partly vaporize, can make the fusing block of predetermined size shape .

In the heat processing step using the laser beam, it is preferable to cover the outer wall 21a of the concave portion 21 with a mask 17 and irradiate it with the laser beam as shown in FIG. 3 . In this way, by disposing the mask plate 17, in addition to preventing the laser beam from irradiating the parts that do not need to be melted on the flocking base 22, it is also possible to prevent the flocking base 22 from being bent or deformed due to the heat generated by the laser.

When irradiating with a laser beam to form a molten mass, it is preferable to adopt a structure in which a nozzle 17a with a slit is provided on the mask plate 17 . The inert gas flow is blown from the nozzle 17a while irradiating with a laser beam, in the process of forming the molten mass 32, the molten mass 32 and the flocking base 22 are cooled, and the molten mass 32 is formed in an environment of an inert gas or in an environment with a low oxygen concentration. . This air flow may be blown after the molten mass 32 is formed.

Especially in the case where the distance between the bristle bundles is narrow, the fused lumps are formed in which the fused lumps are in contact with each other. In this state, the integrated fused block has a solidification shrinkage force towards the center, so the desired angle of hair planting deviates.

In the present invention, since each hair bundle is scanned by a laser to produce a fused mass, and is cooled by an air flow at any time, and since the fused mass is individually shrunk even in a state in which the fused blocks are connected to each other, it is possible to prevent the fused mass from becoming fused. Flock angle offset.

In addition, since the fused mass is formed by blowing with an air current, burning and discoloration of the wool can be prevented, and the molten resin on the wool can also be prevented from adhering to the mask plate 17. Nitrogen, argon, or the like can be used as the blown inert gas.

As for the laser beam for irradiation, there is no particular limitation on the source of the laser beam as long as it can generate an output capable of melting the one end 31 of the above-mentioned hair bundle 3 . As the laser beam generating source, CO ₂ , Ar, TEA, CO ₂ , excimer (ekishima), He-cd, YAG, etc. can be used. Among them, CO ₂ is preferable from the viewpoint of efficiently melting the plastic material.

Next, as shown in FIG. 7 , in the step of covering the flock 32 , thermoplastic resin is filled into the concave portion 21 of the flocking base 22 , and the flock 32 is covered with the thermoplastic resin.

After the above-mentioned covering step, the bristle bundle holding jig 13 is taken out from the above-mentioned mold 18 for injection molding, and the bristle-implanted part 25 is separated to complete the manufacture of the toothbrush.

As described above, using the toothbrush manufacturing method of this embodiment, it is possible to manufacture a high-quality toothbrush with high bristle tuft pull-out strength, resin leakage during resin filling, prevention of bristle twisting and disorder, and little deformation or bending of the bristle-planted base.

The present invention is not limited to the above-mentioned embodiments, and appropriate changes can be made without departing from the spirit and scope of the present invention.

As in the above-mentioned embodiment, in the brush manufacturing method of the present invention, after forming the fusing block to make the opening peripheral edge of the fusing block and the flocking base fixedly bonded, it is preferable to cover the flocking base and the flocking base with a filling resin to integrate them, for example , It can be made integral by bonding the concave part of the flocking base forming the fusion block and the plate-shaped part. Like this, in the form of bonding plate-shaped parts, although there is a gap between the fusing block and the plate-shaped parts arranged on the flocking base, but because the fusing block is fixedly bonded on the flocking base, even when brushing teeth on the hair bundle There is a stress effect, and the angle of the base of the hair bundle does not change.

In addition, as in the above-mentioned embodiment, it is preferable to irradiate with a non-contact heat source by moving the laser beam to scan, but the laser beam may be fixed and the hair transplant base may be irradiated by moving.

As a non-contact heat source, the light from a light source such as an iodine-tungsten lamp can be concentrated to obtain the same effect as a laser beam. In this case, it is preferable that the apparatus is configured such that the light source for collecting light is fixed and the hair-implanted base is moved, as described above.

As in the above-mentioned embodiment, the hair bundle 3 is preferably inserted into the hair-planting hole 24 from the back side of the hair-planting base 22, but may also be inserted into the hair-planting hole from the front of the hair-planting base.

In addition, as in the above-mentioned embodiment, it is preferable that the present invention employs hair cut in advance to a predetermined length, but a bundle of hair wound on a reel may also be used. In this case, it is preferable to insert the hair bundle into the hair-planting hole from the front side of the hair-planting base, and in the heat processing process, melt the protruding hair bundle end with a non-contact heat source to form a fused mass, and make the fused mass and The opening peripheral edge of the above-mentioned tufting hole is fusion-bonded, and as described above, after being fixed, the tuft of hair is cut into a desired length.

As in the above-mentioned embodiment, the present invention is particularly applicable to the manufacture of toothbrushes, but it is also applicable to the manufacture of brushes other than toothbrushes (for example, the manufacture of various brushes such as hair brushes, massage brushes, and cleaning brushes).

According to the above description, the brush manufacturing method of the present invention can manufacture high-quality brushes with high bristle tuft pull-out strength, resin-filled resin leakage can be suppressed, bristles can be prevented from being twisted or messy, and the flocking base can be less deformed or bent.

Claims (9)

1. A method for manufacturing a brush, comprising: a hair bundle insertion step in the tuft hole of a tuft base having a plurality of tuft holes; heating one end of the tuft protruding from the tuft hole, A thermal processing step of forming a fused mass; and a covering step of covering the fused mass, characterized in that, Use a non-contact heat source to heat the surroundings of the hair-planting hole and one end of the hair bundle to form a fusion block, and use the non-contact heat source to heat the opening peripheral edge of the hair-planting hole, and combine the fusion block with the hair-planting hole The opening peripheral edges of the pores are fused and bonded. 2 . The method for manufacturing a brush according to claim 1 , wherein the fusion block and the opening peripheral edge of the tuft-planting hole are not pressed, but the two are fixedly bonded. 3 . 3. the manufacture method of brush as claimed in claim 2 is characterized in that, fixedly bonding this fusion block and the opening peripheral edge of this hair-planting hole, makes the edge of the opening peripheral edge of described fusion block and described hair-planting hole Concavities and convexities are formed on the interface. 4. The method for manufacturing a brush according to any one of claims 1 to 3, wherein the fused mass is formed on each of the bristle bundles. 5. The method for producing a brush according to any one of claims 1 to 3, wherein the fused mass and the flocking base are cooled by an air current during or immediately after formation of the fused mass. 6. The method for manufacturing a brush according to any one of claims 1 to 3, wherein the molten mass is formed in an inert gas atmosphere or an atmosphere with a low oxygen concentration. 7. The method for manufacturing a brush according to any one of claims 1 to 3, characterized in that, according to an irradiation pattern pre-recorded in a memory corresponding to the cross-sectional shape of the hair bundle, the non-contact Type heat source to scan. 8. The brush manufacturing method according to any one of claims 1 to 3, wherein the non-contact heat source is a laser beam. 9. The brush manufacturing method according to any one of claims 1 to 3, wherein in the thermal processing step, the flocking base is partially masked.

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