JP2003009947A - Manufacturing method of toothbrush and toothbrush manufactured based on the method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toothbrush and its manufacturing method by which the hot bulbs are made thinner so that the implanting base can become thinner, or the bristles can be more deeply implanted in the implanting base. SOLUTION: Regarding the toothbrush manufacturing method in which every bristle bundle made of filaments is, all at once, melt and solidified at its base end to form a hot bulb which is to be implanted into a toothbrush head, forming an uneven horizontal line, each hot bulb is made by pressing a hot plate directly to the base end of the bristle bundle for 2 to 5 seconds at the temperature from 215 to 235 deg.C.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothbrush manufacturing method and a toothbrush manufactured thereby.

[0002]

2. Description of the Related Art As a method for manufacturing a toothbrush, instead of a method of fixing a hair bundle formed by bundling filaments made of a resin such as nylon onto a toothbrush transplantation table using a metal flat wire, At the base end of the hair bundle formed by bundling filaments, hot-rolled balls that are collectively melted and solidified in units of one bundle are simultaneously formed, and the hot-rolled balls are embedded and held in the bristle implanting table of the toothbrush. Attention has been paid to the method of planting a bundle with a flat wire. The toothbrush manufactured by this method has advantages such as excellent hair removal strength because it does not use a flat wire and instead embeds and holds the hair bundle in the hair transplantation table. Has also been done a lot. When manufacturing this toothbrush, it is necessary to form hot-melted balls that are collectively melted and solidified at the base end of the bristle bundle.As a method of forming this, there are a contact type in which a hot plate is pressed against the base end of the bristle bundle, and hot air or infrared rays. And a non-contact type in which the hot plate is brought close to the proximal end of the hair bundle.

[0003]

However, both the contact type and the non-contact type have problems. A particular problem is that the molten gas generated from the filament during hot-spot formation causes tar to stick to the surface of the hot-spot and discolors the finished product, resulting in poor appearance. is there. Therefore, in order to prevent this, a method of sucking and removing the molten gas generated during hot-ball formation is used, but this method requires a particularly high heating temperature as compared with the contact type. In the case of the non-contact type, the air around the heating portion is disturbed, which causes a new problem that the heating is not performed uniformly. Therefore, the contact type is reviewed, and for example, the technique disclosed in Japanese Patent Laid-Open No. 10-52324 is disclosed. This technique is to set the temperature of the heating plate to be brought into contact with the base end portion of the hair bundle to an extremely high value of 300 ° C. to 800 ° C., and to make the contact time extremely short of 0.1 seconds to 1 second. This is a method in which the heating plate is brought into contact with the base end of the hair bundle only at an instant. That is, it is based on the idea that the base end portion of the hair bundle is instantly melted at an extremely high temperature and the viscosity thereof is made to be in a free-flowing state, whereby the surface tension is increased and a round shaped hotball is produced.

However, this conventional method also has the following problems. That is, since the filament is melted at a high temperature and the hot spot is produced by utilizing the surface tension, the thickness of the hot spot becomes thick and the flocking table cannot be made thin. Therefore, there is no degree of freedom in design that should be obtained by thinning the flocking table, and as a result of the thick fired ball, it is not possible to bury the hair bundle deeply in the flocking table with limited thickness, so the filament root It is not possible to lengthen the range in which the part is restrained and held, which hinders the enhancement of the uprightness of the filament. Further, due to the high temperature, the burnt balls are burnt or carbonized, which causes a defect in appearance. Alternatively, in order to prevent the molten filaments from sticking to the hot plate, the hot plate is coated with resin, but the coated resin is destroyed due to the high heat and the durability of the coating is ensured. I can't. Therefore, the present invention has been made in order to solve such a problem, and prevents burning and charring of a hot-spot, and makes it possible to reduce the thickness of the hot-spot, which results in flocking. By making the stand thin, it is possible to secure the degree of freedom in design that is possible, or by embedding the hair bundle deeply in the flocking stand, the uprightness of the filament can be improved and the hot plate is coated with resin. If you rub it,
An object of the present invention is to provide a toothbrush manufacturing method capable of ensuring coating durability and a toothbrush manufactured based on the method.

[0005]

As a result of trial and error, the inventor has found that the thicker the hot-rolled ball in the hair bundle is, the higher the hair pulling strength is, but in reality, the filament is formed by melting the filament at a high temperature and utilizing the surface tension. I noticed that there is sufficient plucking strength even if the thickness is not the same as the thickness of the fired ball. Therefore, paying attention to this point, the hot plate is brought into contact with the hair bundle base end portion and slowly pressed at a low temperature to form a hot marble, and at the same time, the hot plate or the hair bundle is swung to soften the hot marble. The present invention invented a method for making the thickness of the film uniform.

The toothbrush manufacturing method of the present invention is specifically the following manufacturing method. That is, at the base end of the bunch formed by bundling filaments, all the bunch of fused balls that are collectively melted and solidified in a bundle are formed at the same time, and the bristles are embedded and held in the flocking table of the toothbrush. According to the method of manufacturing a toothbrush for implanting the hair bundle, a hot plate is pressed against the base end portion of the hair bundle in a contact state, or the base end portion of the hair bundle is brought into contact with the heat plate. In this state, hot-roll forming is performed by setting the hot-roll temperature at 21.
The toothbrush manufacturing method is characterized in that the pressing time is 5 ° C. to 235 ° C. and the pressing time is 2 seconds to 5 seconds.

In the conventional example, the filament is melted at a high temperature and the surface tension is used to form the marble, so that the thickness of the marble becomes thicker. However, according to the above-described method for manufacturing a toothbrush of the present invention, The hot-ball forming temperature is 215 ° C to 235 ° C,
The hot plate is brought into contact with the hair bundle base end portion at a temperature lower than that of the above-mentioned conventional example, and the pressing time is set to 2 seconds to 5 seconds, whereby the filament is softened to form a hot ball. . Therefore, by not using the high temperature, it is possible to prevent burning or charring of the hot ball, and it is possible to form the hot ball thin by softening the filament to form the hot ball. Therefore, for the toothbrush manufactured by the above manufacturing method, the hot-spotted ball can be thinly formed, so that the thickness of the hair transplant table can be thinned. In this case, it is necessary to secure sufficient strength of the flocking table, and it is possible to realize a toothbrush of such a thin flocking table by using a material that can obtain sufficient strength even if the thickness of the flocking table is at this level. it can. This flocking table is much thinner than conventional toothbrushes, so it is possible to use a unique design that was not possible with conventional toothbrushes, thus ensuring flexibility in toothbrush design. can do. In addition, depending on the degree of thinness, it is possible to give elasticity to the flocking table itself, and by using such a toothbrush, the flocking table is deformed along the tooth surface during brushing, and the repulsive force of this deformation Is transmitted to the tip of the hair bundle to facilitate the removal of plaque and enhance the effect of brushing teeth. In this case, the repulsive force due to the elastic deformation of the flocking table can be adjusted by changing the thickness of the flocking table. In addition, since the flocking table can be bent upward due to the elastic deformation of the flocking table, this bending facilitates insertion of the tip of the hair bundle at the center of the flocking table between the teeth and enhances the tooth brushing effect as in the above. be able to. Alternatively, if the thickness of the flocking table is the same as the conventional one, since the hot-spotted ball can be formed thinly, the hair bundle can be buried deeply in the flocking table, and the range for restraining and holding the filament root part can be lengthened. The uprightness of the filament can be increased.

In the above-mentioned toothbrush manufacturing method of the present invention, the surface of the hot plate positioned at the hair bundle base end portion of the hair bundle is perpendicular to the end surface of the hair bundle base end portion when the hot-rolled ball is formed. It is preferable that the hot plate or the hair bundle is swung in a direction orthogonal to the contact surface while being in contact with each other. By doing so, the thickness of the hot-rolled ball formed at the proximal end of the hair bundle can be made uniform, so that the pulling strength of the filament can be made uniform.

Further, in the above-mentioned toothbrush manufacturing method of the present invention, it is preferable that the molten gas generated from the filament is sucked when forming the hot-rolled ball. By doing this, it is possible to prevent tar from adhering to the surface of the hot-spot and discoloration of the finished molded product due to the molten gas generated from the filament when the hot-spot is formed, resulting in a poor appearance of the toothbrush. Can be prevented.

Further, in the above-mentioned toothbrush manufacturing method of the present invention, it is preferable that at least a contact surface of the hot plate with the filament is coated with a resin. By doing so, it is possible to prevent the resin filament from melting and adhering to the hot plate, and since the temperature of the hot plate is lower than that of the above conventional example, the coated resin is destroyed. In addition, the durability of the hot plate can be maintained.

It is recommended to use PFA-based fluororesin as the material for the above coating. The fluororesin has excellent non-adhesiveness to the resin, and the PFA (tetrafluoroethylene perfluoro-alkyl vinyl-ether copolymer) fluororesin is a fluororesin in the range of 215 ° C to 235 ° C. Among them, it is particularly excellent in heat resistance and abrasion resistance.

Further, in the above-described method for manufacturing a toothbrush of the present invention, the hot balls of adjacent hair bundles may be fused together to form one hot ball as a whole. By doing so, the hot balls of all the hair bundles used for one toothbrush are integrated, so that the hair removal strength of the filament can be increased.

Next, a toothbrush manufactured by the above toothbrush manufacturing method will be described. First, according to the toothbrush manufacturing method of the present invention described above, the thickness of the hot ball in the flocking table in the thickness direction from the bottom of the hot ball, at the filament root position gathering in the hot ball in the flocking table, is 0.2 mm to 0.8 mm. The toothbrush can be manufactured. That is, in the above-mentioned conventional example,
The filaments are melted at a high temperature and the surface tension is used to produce the marbles, so that the thickness of the marbles is 1 mm or more, whereas in the toothbrush manufacturing method of the present invention, the thickness of the marbles is 0.
It can be set to 2 mm to 0.8 mm. With this toothbrush, since the thickness of the hotball is thinner than that of a conventional toothbrush,
Compared with a conventional toothbrush, if the thickness of the bristle implant is the same, it can be embedded deeper in the bristle implant than a conventional toothbrush, and the range of restraining and holding the filament root part can be lengthened. Uprightness can be improved. Further, even when the thickness of the flocking table is thinner than that of the conventional toothbrush, there is room for making the length of the root portion that holds the filament restrained longer than that of the conventional toothbrush. In this case also, the uprightness of the filament is improved. be able to.

The thickness of the fired ball is 0.2 mm to 0.8 m.
By setting m, the flocking table thickness is 0.5 mm or more under the condition that the flocking table thickness is 0.3 mm or more thicker than the thickness of the fired ball.
It is also possible to manufacture a toothbrush having a size of mm to 2.8 mm by using a material that can obtain sufficient strength of the flocking table. Compared with conventional toothbrushes, this toothbrush has a significantly thinner flocking table, so it is possible to use a unique design that was not possible with conventional toothbrushes, ensuring flexibility in toothbrush design. can do.

Further, under the same conditions as described above, it is also possible to realize a toothbrush with a thickness of 0.5 mm to 1.5 mm for a hair transplant table. In this toothbrush, the flocking table is much thinner than conventional toothbrushes, so the flocking table itself can have elasticity, and when brushing, the flocking table is deformed along the tooth surface, and the repulsive force of this deformation Is transmitted to the tip of the hair bundle to facilitate the removal of plaque and enhance the effect of brushing teeth. Further, since the flocking table can be curved upward due to the elastic deformation of the flocking table, this bending facilitates insertion of the tip of the hair bundle at the central part of the flocking table between the teeth, and like the above, improves the tooth brushing effect. be able to.

Further, according to the toothbrush manufacturing method, which is characterized in that the above-mentioned hot balls of adjacent hair bundles are fused to form one hot ball as a whole, the hot balls of adjacent hair bundles are combined with each other. It is possible to produce a toothbrush that is fused and put together all the tufts to form a single burnt ball. In this toothbrush, the burnt balls of all the bristles used in one toothbrush are integrally manufactured, so that the hair removal strength can be increased.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1A and 1B are explanatory views of a first embodiment of the toothbrush manufacturing method of the present invention, in which (a) is a first step, (b) is a second step, and (c) is a third step.
(D) represents the fourth step. In these figures, one of the bristles forming the toothbrush is shown. In FIG. 1, 1 is a toothbrush bristle bundle, 2 is a bristle bundle proximal end, 3 is a bristle bundle hotball, 10 is a bristle bundle holder, 11 is a bristle bundle holding hole of the bristle bundle holder 10, and 12 is a bristle. The bundle pressing plate, 13 is a hot plate, 14 is a coating of the hot plate 13, 15 is a toothbrush mold bristle implanting part, and 16 is a resin filling part of the toothbrush mold implanting part.

Next, a method of manufacturing the toothbrush according to the first embodiment will be described. In FIG. 1, a bundle of filaments having a certain length made of a thermoplastic resin such as nylon is bundled to form a bundle of hairs 1, and the plurality of bundles of hairs 1 are provided on a bundle of hairs holder 10. Insert from above into the bundle holding hole 11,
The head of the hair bundle 1 is pressed by the hair bundle pressing plate 12 so that the hair bundle base end portion 2 projects downward (step 1) (FIG. 1A).
Next, a hot plate 13 having a temperature-controlled heater or the like (not shown) built therein is arranged from below so that the surface of the hot plate 13 is in vertical contact with the end of the hair bundle base end portion 2. 2 (step 2) (FIG. 1 (b)) to form a hot ball 3 on the hair bundle base end portion 2 (step 3) (FIG. 1 (c)). Hot plate 1
The surface of 3 is coated (14) with a resin that is non-adhesive to the molten filaments.
After the hot balls 3 are formed on the hair bundle proximal end portion 2, the hot plate 13 is removed, and a toothbrush mold (not shown) for molding the toothbrush bristle table and the handle is used for this mold. By filling with the resin, the bristle bundle 1 is fixed to the bristle implanting base while molding the bristle implanting base and the handle of the toothbrush. That is, the resin-filled part 1 of the flocking base part of the toothbrush mold flocking base part 15
The hair bundle holder 10 holding the hair bundle 1 on which the fired balls 3 are formed is arranged on the toothbrush mold flocking table portion 15 so that the fired balls 3 are located at a predetermined position in the space 6 (Step 4)
(FIG. 1D), a toothbrush is manufactured by filling a resin such as polypropylene into the flocking table part resin filling part 16 and the handle part resin filling part (not shown).

In the above-mentioned toothbrush manufacturing process, the hot-rolled balls 3 are formed on the bristle bundle base end 2 in steps 2 to 3 by pressing the hot plate 13 in contact with the bristle bundle base end 2. Table 1 shows the results of an experiment carried out to determine the conditions for forming a hot marble at that time. The hair bundle 1 in this experiment uses a filament made of nylon 610, and the pressing pressure of the heat plate 13 against the hair bundle base end portion 2 is 0.1 MPa.

[0020]

[Table 1]

FIG. 2 is a graph showing the relationship between the hot plate temperature and the pressing time and the pulling strength in Table 1, and the graph is the relationship between the hot plate temperature and the pressing time and the hot-roll thickness. Is shown in FIG. Further, FIG. 4 is a graph showing the relationship between the plucking strength and the thickness of hot-rolled balls. Practical use has a hair pulling strength of 100
It is said that there is no problem if it is g / cm2 or more, as shown in FIG.
According to the above, when the hot plate temperature is 215 ° C. or higher, the pressing time is 2 seconds to 5 seconds.
In terms of seconds, the hair removal strength of 100 g / cm 2 or more is sufficiently satisfied. Further, according to FIG. 3, when the hot plate temperature is 215 ° C. or higher and the pressing time is 2 seconds to 5 seconds, the hot-rolled thickness is 0.3.
mm-0.7 mm, and in the conventional example, the thickness of the hot-spotted ball is approximately 1 mm or more, so it is recognized that the hot-spotted ball is formed thinner than in the conventional example. Moreover, according to FIG.
It is recognized that the hair pulling strength of 100 g / cm 2 or more can be ensured when the hot-rolled thickness is at least 0.2 mm to 0.8 mm. Although the results will vary somewhat depending on the material of the filament, the hot-roll forming conditions are generally 215 ° C. to 235 ° C. for the hot plate, and pressing time is 2 seconds to 5 seconds. , You can get satisfactory results.

According to the above-described method of manufacturing the toothbrush of the first embodiment, the filament is softened to form a hot-rolled ball.
Therefore, by not using a high temperature, it is possible to prevent charring or carbonization of the hot ball, and it is possible to make the hot ball thin, so that the flocking table can be thinned accordingly. Further, if the thickness of the flocking table is the same as the conventional one, it is possible to form the hot-spotted ball thinly, so that the hair bundle can be buried deeply in the flocking table and the range for restraining and holding the filament root part can be lengthened. It is possible to manufacture a toothbrush with improved uprightness. That is, in FIG. 1 (d), the hair bundle 1
Assuming that the length a of the root part that is restrained and held is the same as that of the conventional example, if the thickness d of the marble 3 becomes thin, the thickness h of the flocking table can be made thinner than that of the conventional example. . Also,
If the thickness h of the flocking table is the same as that of the conventional example, the length a of the root part for restraining and holding the hair bundle 1 in the resin of the flocking table can be increased, and the uprightness of the filament can be improved. Further, even when the thickness h of the flocking table is thinner than that of the conventional toothbrush, there is a room for making the length a of the root portion for restraining and holding the filament longer than that of the conventional toothbrush. Can be increased.

Further, the thickness of this flocking table is from 0.5 mm to
In principle, it is possible to set the hair transplantation table to 2.8 mm, but in order to make the hair transplantation table thin in this way, it is necessary to secure sufficient strength of the hair transplantation table, and the thickness of the hair transplantation table is sufficient as this level Such a thin tooth-implanting toothbrush can be realized by using a material that can obtain various strengths. The thickness of this flocking table is significantly thin compared to conventional toothbrushes, so it is possible to adopt a unique design that could not be adopted with conventional toothbrushes.
The degree of freedom in designing the toothbrush can be secured. In addition, the flocking table thickness is 0.5 mm to 1.5 under the condition that the flocking table thickness is 0.3 mm or more thicker than the thickness of the fired ball.
Setting the thickness to mm is not impossible depending on the material of the flocking table as described above, and by making the flocking table thin to this extent, the flocking table itself can have elasticity. This toothbrush with elasticity on the flocking table itself can deform the flocking table along the tooth surface when brushing teeth, and by transmitting the repulsive force of this deformation to the tip of the hair bundle, it is easy to remove plaque. Therefore, the effect of brushing teeth can be enhanced. In this case, the repulsive force due to the elastic deformation of the flocking table can be adjusted by changing the thickness of the flocking table. Further, since the flocking table can be curved upward due to the elastic deformation of the flocking table, this bending facilitates insertion of the tip of the hair bundle at the central part of the flocking table between the teeth, and like the above, improves the tooth brushing effect. be able to.

In the above-mentioned first embodiment, the surface of the hot plate 13 which is brought into contact with the hair bundle base end portion 2 is coated with the resin 14 which is non-adhesive to the molten filaments. As a result, it is possible to prevent the resin filament from melting and adhering to the hot plate. Moreover, since the temperature of the hot plate is lower than that of the conventional example as described above, the coated resin is not destroyed and the durability of the hot plate can be maintained. As a material for this coating, it is recommended to use a PFA-based fluororesin. The fluororesin has excellent non-adhesiveness to the resin, and the PFA (tetrafluoroethylene perfluoro-alkyl vinyl-ether copolymer) fluororesin is a fluororesin in the range of 215 ° C to 235 ° C. Among them, it is particularly excellent in heat resistance and abrasion resistance.

In the method of manufacturing the toothbrush of the first embodiment, the hair bundle 1 is held by the hair bundle holder 10 with the hair bundle base end portion 2 of the hair bundle 1 facing down, and the heat plate 13 is brushed from below. It is pressed against the bundle base end portion 2, but it is not limited to this, and it is upside down and
The hair bundle 1 may be held by the hair bundle holder 10 with the hair bundle base end portion 2 of the hair bundle 1 facing upward, and the hot plate 13 may be pressed against the hair bundle base end portion 2 from above. Alternatively, the hair plate holder 10 may be rotated 90 degrees to press the heating plate 13 against the hair bundle base end portion 2 in the horizontal direction. In other words, the pressing direction may be any direction as long as the surface of the hot plate is pressed against the hair bundle proximal end vertically. Alternatively, the hair bundle base end portion 2 may be pressed against the heating plate 13.

In the manufacturing process of the toothbrush of the first embodiment, the plate-shaped bristle pressing plate 12 is used to press the head of the bristle bundle 1. Each hair bundle holding hole 1 provided in the hair bundle holder 10 on the surface of the face plate
A columnar protrusion that can be inserted into the hair bundle 1 may be provided, and the head of the hair bundle 1 may be pressed by the end face of the top. In this case, after fixing the hair bundle 1 to the hair transplantation table, the columnar protrusions are attached to the hair bundle holding holes 11
The hair bundle 1 can be easily detached from the hair bundle holder 10 by inserting into the hair bundle holder 10.

Next, a second embodiment of the present invention will be described. In the second embodiment, in the method for manufacturing the toothbrush of the first embodiment described above, when the heat plate 13 is pressed against the end face of the bristle bundle base end portion 2 from below, the heat plate 13 is horizontally pressed while pressing. It swings. That is, in FIG. 1C, the hot plate 13 is horizontally swung while the hot plate 13 is pressed against the end surface of the hair bundle base end portion 2 from below. By doing so, the thickness of the hot-rolled ball formed at the proximal end of the hair bundle can be made uniform, so that the pulling strength of the filament can be made uniform.

In the manufacturing process of the toothbrush of the second embodiment, the hot plate 13 is pressed against the bristle bundle base end portion 2 while the hot plate 13 is being pressed.
Although the hair bundle 1 is rocked, the hair plate 1 may be rocked by making the heat plate 13 stand still and rocking the hair bundle holder 10 instead. According to these methods, the hair bundle 1 is held by the hair bundle holder 10 with the hair bundle base end portion 2 of the hair bundle 1 facing downward, and the heat plate 13 is pressed against the hair bundle base end portion 2 from below. It is not limited to the use in the example manufacturing method, but on the contrary
When the hair bundle 1 is held by the hair bundle holder 10 with the hair bundle proximal end 2 of the above, and the heat plate 13 is pressed against the hair bundle proximal end 2 from above, the hair bundle holder 10 is held at 90 degrees. By rotating
It can be similarly used when the hot plate 13 is pressed against the hair bundle base end portion 2 in the horizontal direction, or when the hair bundle base end portion 2 is pressed against the heat plate 13. That is, either the hot plate or the hair bundle may be swung, and the swinging direction may be a direction orthogonal to the pressing direction of the hot plate to the hair bundle proximal end portion.

Next, a third embodiment of the present invention will be described. In the method for manufacturing the toothbrush of the first embodiment or the second embodiment described above, when the hot plate 13 is pressed against the end surface of the bristle bundle base end portion 2 from below to form the hot-spot 3 as described above, Molten gas is generated from the filaments, causing tar to adhere to the surface of the hot-spotted balls and discoloring the finished molded product, which causes poor appearance. Therefore, this third embodiment has a structure in which the molten gas is sucked and discharged to the outside. In this, the hair bundle holder is provided with an exhaust hole, and the hair bundle pressing plate is provided with an exhaust passage communicating with the exhaust hole, and the molten gas is exhausted to the outside by a vacuum pump through the exhaust hole and the exhaust passage. . Alternatively, instead of this configuration, an exhaust duct may be provided in the gap between the hair bundle holder and the heating plate. By doing this, it is possible to prevent tars from adhering to the surface of the hot-rolled ball and discoloration of the surface of the molded product due to the molten gas generated from the filament when forming the hot-ball, and to prevent the appearance of the toothbrush from being defective. can do. In particular, when the filament is colored, a larger amount of molten gas is generated than in a normal filament, and this effect is remarkable.

Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, in the method of manufacturing a toothbrush of each of the above-described embodiments, the hot spots of adjacent hair bundles are fused together to form a single hot spot. That is, in the method for manufacturing a toothbrush of the first embodiment, the hot plate 13 is pressed against the end face of the bristle bundle base end portion 2 to set the pressing time at the time of forming the hot-spot 3 so that each adjacent It is possible to fuse the fireballs of the hair bundle and form one fireball as a whole. For example, in Table 1, the hot plate temperature 225
When the pressing time is 5 seconds at ℃, welding occurs between the hot balls of all the hair bundles and the hot balls of the hair bundles adjacent to each other, and the hot balls of all the hair bundles are welded to form one hot ball as a whole. Is recognized. Similarly, when the hot plate temperature is 230 ° C. and the pressing time is 5 seconds, or when the hot plate temperature is 235 ° C. and the pressing time is 4 seconds or 5 seconds, one hot-ball formation is recognized as a whole.

Next, a toothbrush manufactured by the above-described method for manufacturing each toothbrush will be described. First, at the filament root position where the filaments gather in the flocking table in the flocking table, 0.2
A toothbrush having a size of mm to 0.8 mm can be manufactured. This can be seen from FIG. 4, as mentioned above. That is, in the above-described conventional example, since the filament is melted at a high temperature and the surface tension is used to make a hot ball, the thickness of the hot ball becomes 1 mm or more, whereas in the above toothbrush manufacturing method, The thickness of the balls can be 0.2 mm to 0.8 mm.
In this toothbrush, as described above, since the thickness of the hot-spotted ball is thinner than that of the conventional toothbrush, so long as the thickness of the flocking table is the same, it can be deeply embedded in the flocking table as compared with the conventional toothbrush, Since the range of restraining and holding the filament root portion can be lengthened, the uprightness of the filament can be enhanced.

The thickness of the fired ball is 0.2 mm to 0.8 m.
By setting m, the flocking table thickness is 0.5 mm or more under the condition that the flocking table thickness is 0.3 mm or more thicker than the thickness of the fired ball.
A toothbrush having a size of mm to 2.8 mm can be manufactured by using a material capable of obtaining sufficient strength of the flocking table. Compared with conventional toothbrushes, this toothbrush has a significantly thinner flocking table, so it is possible to use a unique design that was not possible with conventional toothbrushes, ensuring flexibility in toothbrush design. can do.

Under the same conditions as above, it is possible to manufacture a toothbrush having a flocking table thickness of 0.5 mm to 1.5 mm. In this toothbrush, the flocking table is much thinner than conventional toothbrushes, so the flocking table itself can have elasticity, and when brushing, the flocking table is deformed along the tooth surface, and the repulsive force of this deformation Is transmitted to the tip of the hair bundle to facilitate the removal of plaque and enhance the effect of brushing teeth. Further, since the flocking table can be curved upward due to the elastic deformation of the flocking table, this bending facilitates insertion of the tip of the hair bundle at the central part of the flocking table between the teeth, and like the above, improves the tooth brushing effect. be able to.

Further, according to the toothbrush manufacturing method, which is characterized in that the above-mentioned hot balls of adjacent hair bundles are fused to form one hot ball as a whole, the hot balls of adjacent hair bundles are combined with each other. It is possible to manufacture a toothbrush that is fused to form a single hot ball. In this toothbrush, the burnt balls of all the bristles used in one toothbrush are integrally manufactured, so that the hair removal strength can be increased.

[0035]

According to the toothbrush manufacturing method of the first aspect of the present invention, the hot plate is brought into contact with the hair bundle base end portion at a temperature lower than that of the conventional example, which is 215 ° C to 235 ° C.
The pressing time is set to 2 seconds to 8 seconds, and the filaments are softened by slow pressing to form hot-rolled balls. Therefore, by not using a high temperature, it is possible to prevent charring or carbonization of the hot ball, and it is possible to thin the hot ball by softening the filament to form the hot ball. Therefore, for the toothbrush manufactured by this manufacturing method, the hot-spotted ball can be thinly formed, and thus the thickness of the hair transplant table can be thinned. This flocking table is much thinner than conventional toothbrushes, so it is possible to use a unique design that was not possible with conventional toothbrushes, thus ensuring flexibility in toothbrush design. can do. Also, depending on the degree of thinness, the bristle bed itself can be made to have elasticity, and by using such a toothbrush, the bristle bed is deformed along the tooth surface when brushing teeth, and the repulsive force of this deformation Is transmitted to the tip of the hair bundle to facilitate the removal of plaque and enhance the effect of brushing teeth. In this case, the repulsive force due to the elastic deformation of the flocking table can be adjusted by changing the thickness of the flocking table. In addition, since the flocking table can be bent upward due to the elastic deformation of the flocking table, this bending facilitates insertion of the tip of the hair bundle at the center of the flocking table between the teeth and enhances the tooth brushing effect as in the above. be able to. Alternatively, if the thickness of the flocking table is the same as the conventional one, since the hot-spotted ball can be formed thinly, the hair bundle can be buried deep in the flocking table and the range for restraining and holding the filament root part can be lengthened. The uprightness of the filament can be increased.

According to the toothbrush manufacturing method of the second aspect, since the thickness of the hot-rolled ball formed at the proximal end of the hair bundle can be made uniform, it is possible to provide a toothbrush with a uniform filament pulling strength. it can.

According to the method for manufacturing a toothbrush according to claim 3, since molten gas is generated from the filament at the time of forming a hot-spot, a tar is attached to the surface of the hot-spot and the finished molded product is discolored. The appearance of the toothbrush can be prevented.

According to the toothbrush manufacturing method of the fourth aspect, it is possible to prevent the resin filament from melting and adhering to the hot plate, and since the temperature of the hot plate is lower than that of the conventional example, it is coated. The durability of the hot plate can be maintained without breaking the resin.

According to the toothbrush manufacturing method of the fifth aspect, the heat resistance and abrasion resistance of the hot plate can be improved by using the PFA-based fluororesin as the material for coating the hot plate.

According to the toothbrush manufacturing method of the sixth aspect, since the hotballs of all the bristles used for one toothbrush are integrated, it is possible to provide a toothbrush with enhanced filament pulling strength. .

In the toothbrush according to claim 7, since the thickness of the hot-spotted ball is thinner than that of the conventional toothbrush, if the thickness of the flocking table is the same as that of the conventional toothbrush, the flocking table is better than that of the conventional toothbrush. Since it can be buried deeply and the range for restraining and holding the filament root part can be lengthened, the uprightness of the filament can be enhanced. Also, even if the thickness of the flocking table is thinner than the conventional toothbrush,
There is room to make the length of the root part that holds the filament restrained longer than in conventional toothbrushes,
Also in this case, the uprightness of the filament can be enhanced. Further, when the hot balls of all the bunch used for one toothbrush are integrally manufactured, the hair removal strength can be increased.

In the toothbrush according to the eighth aspect, the bristle bed is much thinner than the conventional toothbrush, so that it is possible to adopt a unique design which cannot be adopted in the conventional toothbrush. The degree of freedom in design can be secured.

In the toothbrush according to the ninth aspect, since the flocking table is much thinner than the conventional toothbrush, the flocking table itself can be made to have elasticity and the flocking table is deformed along the tooth surface during tooth brushing. By transmitting the repulsive force of this deformation to the tip of the hair bundle, the plaque can be easily removed and the effect of brushing the teeth can be enhanced. Further, since the flocking table can be curved upward due to the elastic deformation of the flocking table, this bending facilitates insertion of the tip of the hair bundle at the central part of the flocking table between the teeth, and like the above, improves the tooth brushing effect. be able to.

[Brief description of drawings]

FIG. 1 is an explanatory view of the toothbrush manufacturing method of the first embodiment,
(A) is the first step, (b) is the second step, (c)
Represents the third step, and (d) represents the fourth step.

FIG. 2 is a graph (1) showing experimental results regarding the toothbrush manufacturing method of the first embodiment.

FIG. 3 is a graph (2) showing an experimental result regarding the toothbrush manufacturing method of the first embodiment.

FIG. 4 is a graph (3) showing an experimental result regarding the toothbrush manufacturing method of the first embodiment.

[Explanation of symbols]

1 hair bundle 2 Hair bundle base end 3 hot balls 10 Hair bundle holder 11 Hair bundle holding hole 12 Hair bundle pressing plate 13 hot plate 14 coating 15 Toothbrush mold Flocking base 16 Flocking part Resin filling part

Claims (9)

[Claims] 1. At the base end portion of a hair bundle formed by bundling filaments, hot-rolled balls which are collectively melted and solidified in units of one bundle are simultaneously formed for all hair-bundles, and the hot-rolled balls are embedded in a bristle implanting table of a toothbrush. In the toothbrush manufacturing method of implanting the bristle bundle by holding, a hot plate is pressed in contact with the base end portion of the bristle bundle, or the base end portion of the bristle bundle is brought into contact with the hot plate. Is pressed in a contact state to perform hot-ball formation, and the hot-ball formation conditions are a hot plate temperature of 215 ° C. to 235 ° C. and a pressing time of 2 seconds to 5 seconds. 2. The hot plate positioned at the hair bundle proximal end portion of the hair bundle when the hot-rolled ball is formed, while the surface of the hot plate is in contact with the end surface of the hair bundle proximal end portion of the hot plate. The toothbrush manufacturing method according to claim 1, wherein the hot plate or the bristle bundle is swung in a direction orthogonal to a surface. 3. The molten gas generated from the filament is sucked when the hot-rolled ball is formed.
Alternatively, the toothbrush manufacturing method according to claim 2. 4. The method for manufacturing a toothbrush according to claim 1, wherein at least a contact surface of the hot plate with the filament is coated with a resin. 5. The method of manufacturing a toothbrush according to claim 4, wherein the resin is a PFA-based fluororesin. 6. Fused balls of adjacent hair bundles are fused together,
A single hot-rolled ball is formed as a whole.
To the method of manufacturing a toothbrush according to claim 5. 7. The thickness of the fired ball in the thickness direction inside the hair transplantation table from the bottom surface of the fired ball at the filament root position where the filaments gather in the hair transplantation table is 0.2 mm to 0.8 mm. A toothbrush manufactured by the method for manufacturing a toothbrush according to any one of claims 1 to 6. 8. The flocking table thickness is set under the condition that the flocking table thickness is 0.3 mm or more thicker than the thickness of the hot-rolled ball.
The toothbrush according to claim 7, wherein the toothbrush has a thickness of 0.5 mm to 2.8 mm. 9. The flocking table thickness is set to 0.5 under the condition that the flocking table thickness is 0.3 mm or more thicker than the thickness of the fired ball.
8. It becomes as mm-1.5 mm, It is characterized by the above-mentioned.
The listed toothbrush.