KR101243431B1 - Method of processing tooth brush bristle tip - Google Patents

Abstract

The hair tips are roughly hemispherical for each hair, and the hair tips are covered with rippled cuts covered with a number of hemispherical profiles, so that the hairline is soft and the touch feels smooth, and the fitting to the gap between the teeth and gums is excellent, Provide a flat toothbrush and a method of processing busbars suitable for the treatment or prevention of periodontal disease. In the flat bristle toothbrush which has the hair | bristle bundle 4 which tied several hair | bristle bundles 4 and folds it in two layers by a flat line, and has the neck part 5 and the handle part following this, the hair | bristle bundle 4 is The diameter of the tuft hole 3 to be planted is set to 1.7 to 2.3 mm, the tip shape of the hair bundle 4 planted in the tuft hole 3 is roughly hemispherical, and the hemispherical portion of the bristle tip is formed. The difference between the height of the top and the bottom of the bottom (d) is 1 to 3 mm, the hair width (W) is 6 to 13 mm, the number of hair bundle rows in the head width direction is 3 to 4 rows, and the length of the hair (h) is 7 To 13 mm.

Description

METHOD OF PROCESSING TOOTH BRUSH BRISTLE TIP}

The present invention relates to a mother wire for a flat wire type implanted tooth brush having a hair-hair profile suitable for use in the treatment or prevention of periodontal disease. It is about a bristle tip) processing method.

Background Art Conventionally, various studies have been conducted on the bristles profile of a toothbrush, and a cutout (mountain cut) suitable for interdental cleaning and a dome cut between the teeth and the gum are generally used. . In addition, many three-dimensional bristles profiles have been proposed.

Toothbrushes for periodontal disease are required to have a bristle specification that is easy to wipe the boundary between teeth and gums, and therefore, a dome cut hair is employed. However, with a simple dome cut, the fit between the tooth and the root portion (so-called interdental triangle) between the teeth is low, and there is room for further research to clean up every corner. In addition, although the cleaning property of a clearance part is suitable for a cut of a hair | bristle cut, a hair | bristle cone, etc., it is difficult to use it as a toothbrush for periodontal disease with a lot of users whose toothpaste is weak, and lacks the softness of a touch. It is supposed to be.

On the other hand, regarding the three-dimensional three-dimensional profile, in the case of a general flat bristle toothbrush, since the hair is profiled by passing the bristles through a hair cutter after the bristling, a complicated shape was difficult to realize. Therefore, although the toothbrush etc. which made the hair | bristle tip to the cone shape were proposed as a design of a flat type hair brush, the practical busbar processing method was not developed because of the difficulty of processing, and it was difficult to apply to a commercial item actually. As a manufacturing method of the toothbrush which enables a three-dimensional profile, non-parallel hair transplanting methods, such as in-mold molding, are mentioned, but since non-parallel hair-growing methods are low productivity and badly convertible, the facility investment is expensive and it costs high cost. There is a problem that it is easy to be.

Hereinafter, several descriptions are given about the bristles profile in the conventional toothbrush, holding a prior patent document.

1. Patent Document 1 (Japanese Patent Application Laid-Open No. 57-57733)

The toothbrush which formed the mother line of a hair | bristle bundle in multiple stages is shown. Since this toothbrush is a shape with a step, the feeling of a bus bar is bad, and it is not suitable as a toothbrush for periodontal disease. In addition, because of its chain hair shape, it is difficult to manufacture with a flat hair transplant, and a specific manufacturing method is not specified.

Although it is feasible with a non-flat type toothbrush, for example, an in-molded toothbrush, etc., it becomes expensive.

2. Patent Document 2 (Japanese Patent Publication No. 6-57231)

Three-dimensional toothbrush is shown. Because it has a sharp peak, it is suitable for interdental cleaning, but it is not suitable as a toothbrush for periodontal disease because it does not feel soft. Moreover, it does not disclose at all about the manufacturing method.

3. Patent Document 3 (Japanese Unexamined Patent Publication No. 7-17133)

The toothbrush which protrudes as the 1st brush hair | bristle bundle in which the front-end | tip was formed in conical shape, and the 2nd brush bristle hair | bristle in which the front-end | tip part was formed flat, is longer than the 2nd brush bristle bundle, and is shown. Although the toothbrush is suitable for reducing the gap between the tooth and the tooth surface, but the tip of the first bristle bundle is pointed in a conical shape, the tooth cannot be massaged smoothly. It is not suitable as a toothbrush for periodontal disease. In addition, a manufacturing method for obtaining a cone hair bundle is not specified.

4. Patent Document 4 (Japanese Patent Laid-Open No. 9-149815)

One or more hair bundles are widened in the longitudinal direction of the hair seedling, and the tip of the hair bundle is formed into a point, linear, or planar portion. Toothbrushes are shown. Since this toothbrush has a wide hair | bristle bundle in the longitudinal direction of a bristle bed in a side part, the feeling of fitting to the base part (interdental triangle) of an interdental is low, and it is not suitable as a toothbrush of periodontal disease. Since bristles profiling by the cut process in a flat hair | bristle hairbrush is difficult, non-flat hair | bristle hair is employ | adopted and there exists a problem that manufacturing cost becomes high easily.

5. Patent Document 5 (Japanese Patent Laid-Open No. 10-295447)

A cylindrical drum polishing apparatus having a cylindrical drum having an abrasive material on the surface thereof is disposed so as to be capable of self-rotation driving, and a spiral surface is formed on the polishing surface. Although this grinding | polishing apparatus is a bus | bar rounding apparatus which is effective for busbar operation | movement, such as a ridge toothbrush, there exists room for improvement, such as setting of the uneven | corrugated shape suitable for bristles shape.

Patent Document 1: Japanese Patent Application Laid-Open No. 57-577339 (full text, all over)

Patent Document 2: Japanese Patent Application Laid-Open No. 6-57231 (Professional, Conversation)

Patent Document 3: Japanese Patent Application Laid-Open No. 7-17133 (Professional, Conversation)

Patent Document 4: Japanese Patent Application Laid-Open No. 9-1498159 (Full Text, Evangelism)

Patent Document 5: Japanese Patent Application Laid-Open No. 10-295447 (Professional, Conversation)

DISCLOSURE OF INVENTION

Problems to be solved by the invention

Including the toothbrush described in the patent document, the bristles of conventional toothbrushes have the following problems.

(1) Since the feeling of busbar fitting to the boundary wood of a tooth and gum is not enough, a domed cut bristle tends to generate | occur | produce a remnant which wiped off, and there exists a problem in cleaning property.

(2) The cut of the cutting section and the bristle cone cutting bristles excellent in the clearance cleaning property were inadequate for patients with periodontal disease, such as weak tooth paste, because the touching feeling of the mothership was not soft.

(3) The method of rounding the mother wire within the range of the manufacturing method of the flat bristle toothbrush has not been developed for the complex hair-shape in which the tip is roughly the hemispherical shape for every hair | bristle bundle. There is a problem that it is inevitable to employ the wire-fed method, which leads to high cost.

The present invention has been made to solve the above problems, and the hairline tip is made roughly hemispherical for each hairline, and the hairline tip is made of ripple cuts covered with a number of hemispherical profiles, so that the hairline is soft and the touch is soft. It is an object of the present invention to provide a flat toothpaste toothbrush that is excellent in the fit between the teeth and the gums and is suitable for the treatment and prevention of periodontal disease, and a method for processing the bus bar.

Means for solving the problem

In order to achieve the above object, the present invention employs the following means.

That is, the toothbrush of Claim 1 is comprised by the handle which consists of a head part, a neck part, and a handle part, and the hair | bristle bundle which consists of a plurality of hair bristles, and each hair | bristle bundle is a flat line with the tuft hole formed in the head part. In the toothbrush fold | folded in two layers by the above, WHEREIN: The diameter of the said tuft hole is set to 1.7-2.3 mm, and the tip shape of the hair | bristle bundle transplanted into the said tuft hole is made into the rough hemispherical shape.

Here, the "schematic hemispherical shape" in this invention refers to the cone shape which rounded off the hair | bristle bundle part, or the quadrangular or polygonal cone shape which rounded off the hair | bristle bundle part and main surface edge.

The toothbrush of Claim 2 WHEREIN: The toothbrush of Claim 1 made the difference of the height of the hemisphere of the hemispherical part of the front end of the said hair | bristle bundle, and the bottom part into 1 to 3 mm.

The bus bar processing method of Claim 3 is a bus bar processing method for manufacturing the toothbrush of Claim 1 or 2, Comprising: The said hair | bristle bundle tip is outlined with a cutter in the several direction different from the said toothbrush head part. The process of cutting into a die shape and the process of rounding the cut | disconnected hair | bristle bundle front end with a bus bar rounding apparatus are carried out to shape | shape the said hair | bristle bundle front end in rough hemispherical shape.

In the bus bar processing method of Claim 4, the bus bar processing method of Claim 3 WHEREIN: The grinding | polishing surface of the said grinding disk using the bus bar rounding apparatus provided with a rotating disk as said bus bar rounding apparatus. From the center of the disk outward to form a wavy spiral with a wavy cross section in a radial cross-section, and the spiral pitch of the spiral irregularities is approximately equal to the pitch between the holes of the tuft holes. In addition, the difference between the heights of the spiral irregularities is set to be substantially the same as the difference between the height of the hemispherical portion and the height of the bottom portion, and the abrasive grain size of the polishing surface composed of the spiral irregularities is set from # 100 to. It is set in the range of # 800.

The bus bar processing method of Claim 5 is a 1st rounding process using the grinding disk which has the abrasive grain size # 100-# 400 of a grinding surface in the bus bar processing method of Claim 4, and a polishing surface And a second rounding process using an abrasive disk having an abrasive particle size of # 400 to # 800.

1. Hair bundle tip shape

As mentioned above, the tip shape of the hair | bristle bundle in the toothbrush of this invention is a rough hemispherical shape. If the tip is pointed like a conical shape or the tip is pointed like a cone shape and the edge is present on the main surface, it is not possible to obtain a soft touch. However, the apex portion of the hair bristle tip may have a slight flat surface. If the flat surface is too large, the feeling of fitting between the teeth and the gums will be impaired. Therefore, the flat surface is preferably about 0.5 mm in diameter or less.

The difference d between the height of the hemisphere and the bottom of the hemispherical portion is 1 to 3 mm, more preferably 1.5 to 2.5 mm. If the thickness is less than 1 mm, the unevenness is hardly felt at the time of printing, and if the thickness exceeds 3 mm, the unevenness is not only saturated, but the angle of inclination of the side surface of the hemispherical portion becomes too severe. Various abnormalities occur, such as shortening the cutter life.

The diameter of the hair bundle, that is, the diameter of the tuft hole into which the hair bundle is planted, is 1.7 to 2.3 mm, more preferably 1.8 to 2.2 mm. If the thickness is less than 1.7 mm, the amount of hairs per hair bundle is too small, and even if the mother wire is roughly hemispherical, it tends to be acute, and the touch feeling is impaired. When it exceeds 2.3 mm, the amount of hairs per hair | bristle bundle per hair will become too large, and the feeling of fitting between a tooth and a gum will be impaired.

As for the pitch P of the hole of a tuft hole, about 2.0-4.5 mm is preferable. If the pitch is too narrow, the hair growth hole cracks, and if the pitch is too wide, the density of the hair is lowered, and the feeling of contact of the mother wire becomes worse.

As for the arrangement | sequence of a hair | bristle bundle, ie, the arrangement | positioning of a tuft hole, 3-4 rows are preferable in the head width direction. In the second column or less, the chain pressure cannot be completely dispersed, and thus the feeling of the bus bar deteriorates. When four rows are exceeded, the width of the head portion is so wide that the operability in the oral cavity is deteriorated.

It is preferable that the hair growth width W is 6 to 13 mm. If it is less than 6 mm, it will interfere with the arrangement | sequence of a hair | bristle bundle, and when it exceeds 13 mm, operability in oral cavity will worsen and it is unpreferable. Moreover, as for the hair | bristle part length L along the head part longitudinal direction, about 16-25 mm is preferable at the point of intraoral operability.

As for the length h (height from a seedling surface to a hair | bristle bundle tip) of a hair, about 7-13 mm is preferable. Below this, the feeling of hairiness (hair stiffness) becomes high, and it tends to lose softness. Above this, oral operability falls.

2. Material of each part of toothbrush

The material of the hair | bristle hair (filament) which comprises a hair | bristle bundle is common toothbrushes, such as polyamide, polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polyethylene terephthalate (PET), polypropylene (PP), etc. The material used is preferred.

As for the bristles diameter, about 100-230 micrometers in diameter used for a general toothbrush is preferable. Too thick bristles are not suitable for toothbrushes such as periodontal disease. Although the hair-shaped cross section shape is arbitrarily good, the circular cross section excellent in the sitting durability is preferable.

The handle material is not particularly limited as long as it is used for a general toothbrush such as polypropylene (PP), PET resin, acrylic resin, and elastomer (olefin, styrene, polyethylene, urethane, etc.). The handle may be one-color molding, but may be a multi-color molded article using the elastomer.

3. Cut processing of busbar

The cutting process of a bus bar is performed after the hair | bristle bundle which tied several chain hairs was folded, type | mold, and fixed in two layers in a tuft hole with a flat line.

For example, the head part of the toothbrush which transplanted the hair | bristle bundle is supported by the chuck which can be rotated 90 degrees. Then, preferably, the bristled tip is precut to the vicinity of the set hair length with a flat cutter. Then, at first, the front end of each hair | bristle bundle is roughly cut-out on the head side surface side using a horizontal cutter, and then the chuck is rotated 90 degrees, and a head part is used using a longitudinal cutter. The front end of each hair | bristle bundle is similarly cut into roughly mountainous shape in the longitudinal direction. In addition, this cutting procedure may be cut in the head part side direction side by a vertical cutter, and may cut in the head part side side by a horizontal cutter.

In the case where the chuck is rotated 90 degrees as described above, the cutting edge direction of the cutter may be the same in both the longitudinal and horizontal cutters, and the longitudinal and horizontal cutting directions are changed by the 90-degree rotation of the chuck. When the chuck is not rotated, the blade direction of the longitudinal and horizontal cutters may be disposed to cross 90 degrees. In this case, the horizontal cutter may be moved as in the prior art, but in order to cut vertically in the longitudinal direction of the head portion with the vertical cutter, it is preferable that the cutting process is not continuous but is intermittent, and the vertical cutter is swinged back and forth and cut. Do.

In addition, when a part of the hair is laid down and squeezed by a Kushi or a comb device in one of the vertical and horizontal cutter processes, the hair bundle becomes a roughly shaped cut cut in one direction. And the hair bundle of the conventional one-way mountain cut can be mixed.

4. Busbar rounding processing

Since only the cut by the vertical and horizontal cutters is used to cut in the longitudinal and horizontal directions, the bristle bundle tip does not become a rough hemispherical shape. In order to make a rough hemispherical shape, it is better to cut again in the inclined direction, but in this way, not only is it expensive due to the enlargement of the equipment, but also the hole arrangement is regulated, and the degree of freedom of toothbrush design is narrowed. Not desirable

Therefore, in the present invention, in order to cut off the edge of the main surface cut into a quadrangular cone shape and to round the bus bar to roughen it into a rough hemispherical shape, a spiral shape having a cross-sectional waveform on the polished surface is formed. A bus bar rounding process is performed using a bus bar rounding device having irregularities. By grinding so that the hair | bristle front-end | tip part may be stroked by the grinding | polishing surface which consists of the spiral-shaped unevenness | corrugation which formed this cross-sectional waveform, the edge of a hair | bristle bundle is rounded and the extra edge part of a main surface is shaved off. Subsequently, one busbar rounding at the bristle tip of a hair | bristle bundle tip is performed by the busbar rounding apparatus with a fine abrasive grain size. Finally, the abrasive powder attached to the toothbrush is removed by air blow or the like, and after the quality inspection, the toothbrush of the present invention as a finished product is obtained.

As the bus bar rounding device used in the present invention, a bus bar rounding device that is easy to handle and inexpensive and takes no space is preferable. As such a bus bar rounding device, it is preferable to use a disk bus bar rounding device provided with a rotating disk-shaped polishing disk. On the polishing surface of the disk-shaped polishing disk, unevenness of cross-sectional waveforms having roughly the same uneven pitch as the profile of the bristles and the difference between the height and the height of the bottom are attached. This unevenness | corrugation is set as the spiral unevenness | corrugation toward an outer side from a disk center.

In the rounding process of the hair | bristle bundle tip, the said grinding disk is rotated and the chain hair wire passes through the grinding | polishing bus bar about 0.5-2 mm on the grinding | polishing surface which consists of spiral irregularities of this grinding disk. Spiral irregularities fit to the front end of the hairs while rotating, and the hairs are polished in order because the hairs are sequentially released. It is preferable that the rounding process is performed plural times (for example, two times) by changing the abrasive grain size of the polishing surface by polishing by such spiral irregularities.

Taking the case of performing rounding twice as an example, in the first rounding process, the abrasive grain size of the polishing surface consisting of spiral irregularities is in the range of # 100 to # 400, and in the second rounding processing, spiral unevenness It is preferable that the abrasive grain size of the polishing surface which consists of this is made into the range of # 400-# 800. Polishing time is about 1.5 to 3 second per rounding process. If the treatment time is too short, there is no sufficient rounding effect. Too long is not preferable because productivity is lowered.

Effects of the Invention

According to the toothbrush of Claim 1, since the diameter of the hair | bristle bundle which transplants a hair | bristle bundle is 1.7-2.3 mm, and the tip shape of the hair | bristle bundle which was planted in the said hair | bristle hole was made into roughly hemispherical shape, a mothership and a tooth It fits on the boundary of the gums, and the touch is soft and soft, and it can be made into a flat hair brush which is suitable for use in patients with periodontal disease having a toothy delicacy.

Moreover, according to the toothbrush of Claim 2, it is periodontal by setting the difference (d) of the height of the hemispherical part of the hair | bristle tip to the height (d) to 1-3 mm, and the hair | bristle part width (W) to 6-13 mm. It can be set as a flat type toothbrush which is most suitable for the treatment or prevention of a disease disease.

Moreover, according to the bus bar processing method of Claim 3, after cutting a hair | bristle bundle front end with a cutter roughly in several different directions with respect to a toothbrush head part, rounding the cut hair | bristle bundle front end with a bus bar rounding apparatus. Therefore, since the bristle tip was shaped into a rough hemispherical shape, the bristle tip of the flat hair bristle toothbrush, which had been difficult to process into a hemispherical shape, can be processed simply and reliably in a rough hemispherical shape. For this reason, productivity can also be improved as a result of inexpensive facility investment, and the flat bristle toothbrush which profiled the hair | bristle tip to the rough hemispherical shape can be provided at low cost.

Moreover, according to the bus bar processing method of Claim 4, as a bus bar rounding apparatus, the bus bar rounding apparatus provided with the rotating disk-shaped polishing disk was used, and the outer side of a disk is polished from the center of a disk to the polishing surface of the said disk-shaped polishing disk. Spiral irregularities having a wavy shape in a radial cross section toward the side are formed, and the spiral pitch P of the spiral irregularities is set to be substantially the same as the pitch between the holes of the tuft holes, and the difference in the uneven height t ) Is set to be substantially equal to the difference (d) between the height of the top and bottom of the rough hemispherical portion, and the polishing particle size of the polishing surface composed of the spiral irregularities is set within the range of # 100 to # 800, thereby making simple adjustment. Therefore, high quality complex bus bar rounding can be performed. Moreover, since the facility structure is simple, it is excellent in maintenance property, and can aim at low cost and space saving.

Moreover, according to the bus bar processing method of Claim 5, the bus bar rounding process by a grinding | polishing disk is divided into two processes of a 1st rounding process and a 2nd rounding process, In a 1st rounding process, polishing of a grinding surface By setting the particle size to # 100 to # 400 and the polishing particle size of the polishing surface to # 400 to # 800 in the second rounding step, the bristle tip can be shaped simply and reliably in a rough hemispherical shape.

BRIEF DESCRIPTION OF THE DRAWINGS The 1st Embodiment of the toothbrush concerning this invention is shown, (a) is a side view of a head part, (b) is a front view of a head part, (c) is a top view of the head part abbreviate | omitted.

Fig. 2 shows a second embodiment of the toothbrush according to the present invention, wherein (a) is a side view of the head portion, (b) is a front view of the head portion, and (c) is a plan view of the head portion without the hair bundle.

Fig. 3 shows an example of a bus bar processing apparatus used in the bus bar processing method of the present invention, (a) is an amblyopia side view showing the overall configuration of the apparatus, and (b) is a amblyopia side view of a busbar rounding apparatus. , (c) is an amblyopia plan view of a disk-shaped abrasive disk.

Fig. 4 shows the shape change by the bus bar processing of the hair bristle tip, (a) is an ambly-expanded perspective view of the bristle tip after precut by a flat cutter, and (b) amblyopia of the bristle tip after a cut by the transverse cutter. An enlarged perspective view, (c) is an ambly-eyed enlarged perspective view of the bristle tip after cut cutting by a longitudinal cutter, and (d) is an ambly-closed enlarged perspective view of a bristle tip which has become roughly hemispherical by bus bar rounding.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings.

In FIG. 1, 1st Embodiment of the toothbrush concerning this invention is shown. In the figure, 1 is a head part of a toothbrush, 2 is a hair part of a head part, 3 is a hair transplantation hole, 4 is a hair bundle implanted by a flat hair, 5 is a neck part following the head part. An embodiment of the present invention is a flat line type having a head portion 1 in which a plurality of hair bundles bundling a plurality of chain hairs are folded in two layers by a flat line, and having a neck portion 5 and a handle portion (not shown). In the tufted toothbrush, while the diameter of the 24 tuft holes 3 for planting the hair | bristle bundle 4 is 2.0 mm, the tip shape of each hair | bristle bundle 4 implanted in these tuft holes 3 is outlined. The hemispherical shape has a hair width W of 9.2 mm, a pitch of 3.0 mm for a hole in the head length direction of the hair growth hole 3, a pitch of 2.4 mm for a hole in the head width direction, and a tip of each hair bundle. 2.0mm for the difference between the height of the hemispherical part and the height of the bottom part (d), 7 rows of the number of hair bundle rows in the head length direction, and the head part width. The maximum number of hair bundles in the direction is 4 rows, and the length (h) of the hair is 10.0 mm.

The toothbrush of FIG. 1 is manufactured as follows using the injection molding machine (not shown), the flat cutting machine, and the busbar processing apparatus 20 of FIG.

First, using the injection molding machine which is not shown in figure, the tuft hole 3 (hole diameter = φ2.0mm, pitch between holes of head part longitudinal direction = 3mm) to the head part 1 (width = 11.0mm) The toothbrush handle of the shape of FIG. 1 (c) which arrange | positioned the pitch | interval between the hole of the width direction = 2.4 mm, the number of holes = 24) in the shape of the board | substrate was injected by polypropylene (WP638C: Sumitomo Chemical Co., Ltd.). Mold.

Subsequently, using a general flat machine (ZT-1: Zahoranski Co., Ltd.), a plurality of hair-cutting hairs (hair material = polyamide 6mil (0.152 mm)): DuPont yarn) is bundled and folded together in two layers to form a flat hairline to form a hair bundle (4). And the hair | bristle bundle 4 of the hair | bristle bundle hair transplantation | fiber-off is cut out by the flat-cut cutter which abbreviate | omitted while holding this toothbrushing toothbrush with the movable chuck 21 of the bus bar processing apparatus 20 of FIG. It is precut to 5 mm (refer FIG. 4 (a)).

Subsequently, after cutting each said pre-cut hair | bristle bundle 4 into the rough shape (pitch 3.0mm between peaks) by the horizontal cutter 22 at the head side surface side (refer FIG. 4 (a)), the chuck 21 ) Is rotated 90 degrees, and cut by the vertical cutter 23 into the rough shape (mountain pitch = 2.4 mm) on the head length direction side (refer to FIG. 4C).

In the cut state by the longitudinal cutter, the bristle tip is roughly quadrangular in shape, and subsequently, the bristle tip is polished using a bus bar rounding device, and the edge of the quadrilateral shape is trimmed and the bus bar is rounded. The bristle bundle tip is shaped into a rough hemispherical shape (see FIG. 4 (d)).

Specifically, this is performed using two bus bar rounding devices 28 and 29 in FIG. This bus bar rounding device 28, 29 formed the spiral surface unevenness | corrugation 25 which formed the cross-sectional waveform in the grinding | polishing surface 24, as shown in the schematic structure in FIG.3 (b), (c). A disk-shaped polishing disk 26 is provided, and the polishing disk 26 is configured to rotate in the direction of an arrow R and to control the rotational speed by the motor portion 27.

The 1st bus bar rounding apparatus 28 is the uneven | corrugated pitch P of the spiral-shaped unevenness 25 = 3,0mm, uneven | corrugated height t = 2.0mm, abrasive grain size = # 100, disk rotation speed = 2000rpm The tip part of the hair | bristle bundle 4 cut into the outline quadrangular shape using this 1st bus bar rounding device 28 is ground for 2.5 second, and the tip part is rounded while cutting off the quadrangular edge. The front end of the hair bundle is shaped into a rough hemispherical shape with a difference (d) of 2.0 mm between the height of the government and the bottom.

Subsequently, using the second bus bar rounding device 29, rounding processing of one of the hair bristles constituting the hair bundle 4 is performed. This 2nd bus bar rounding apparatus 29 is set to uneven | corrugated pitch (P) = 3.0 mm, uneven | corrugated height (t) = 2.0mm, grinding | polishing particle size = # 400, disk rotation speed = 1500rpm, By using the bus bar rounding device 29, the hair bundle front end portion shaped into a rough hemispherical shape is ground for 2 seconds, and rounding processing of one hairline of the bristles of the hair bundle front end is performed.

Finally, the abrasive powder attached to the toothbrush was removed by air blowing in the hair removal apparatus 30, and after the appearance inspection, the toothbrush of FIG. 1 as a finished product was obtained.

2 shows a second embodiment of the toothbrush according to the present invention.

According to the second embodiment, the head portion 1 in which the hair bundle 4 which bundles the plurality of chain hairs is folded and trimmed in two layers by a flat line, and the neck portion 5 and the handle portion (not shown) that follow. In the flat hair transplant toothbrush having, the diameter of the 15 tuft holes 3 for transplanting the hair | bristle bundle 4 is 1.8 mm, and the tip of each hair | bristle bundle 4 planted in these tuft holes 3 is planted. The shape was roughly hemispherical, and the hair width W was 6.6 mm, the pitch between the holes in the head portion length direction of the hair growth hole 3 was 2.8 mm, and the pitch between the holes in the head width direction 2.4 mm, respectively. 1.5 mm for the difference between the height of the hemispherical part of the hair-bristle part and the bottom part (d), 5 rows of hair | bristle bundle rows in the head part length direction, 3 rows of hair | bristle bundle rows in the head width direction, and hair length (h) Is set to 9.0 mm.

The toothbrush of FIG. 2 is manufactured as follows using the injection molding machine (not shown), the flat type milling machine, and the busbar processing apparatus 20 of FIG.

First, using the injection molding machine which is not shown in figure, the tuft hole 3 (hole diameter = φ1.8mm, pitch between holes of a head part length direction = 2.8mm) to the head part 1 (width = 8.6mm) The toothbrush handle which becomes the shape of FIG. 2 (c) which arrange | positions the pitch between holes of the width direction = 2.4 mm, the number of holes = 15) in the shape of a checkerboard is injected by polypropylene (WP638C: Sumitomo Chemical Co., Ltd.). Mold.

Subsequently, a plurality of hair bristles (head hair material = polyamide 6 mil (0.152 mm) hair: DuPont) were placed in the hair follicle hole 3 of the head part 1 using a general flat machine (manufactured by Tsujimura Machinery Co., Ltd.). It bundles and folds into 2 layers, it forms together with a flat line, and it is set as hair | bristle bundle (4). And the hair | bristle bundle 4 after carrying out the hair | bristle bundle hair transplanting toothbrush with the flat chuck | cut-out cutter which does not show in figure while holding the toothbrush of the hair | bristle bundle hairbrushing with the movable chuck 21 of the bus bar processing apparatus 20 of FIG. Precut to mm (refer FIG. 4 (a)).

Subsequently, after cutting each said pre-cut hair | bristle bundle 4 into the rough shape (a pitch between pitches of 2.8 mm) by the horizontal cutter 22 (refer FIG. 4 (a)), the chuck 21 ) Is rotated 90 degrees, and cut by the vertical cutter 23 into the rough shape (mountain pitch = 2.4 mm) on the head length direction side (refer to FIG. 4C).

In the cut state by the longitudinal and horizontal cutters, the bristle tips are roughly quadrangular, so that the bristle tips are continuously polished using a bus bar rounding device, the edges of the quadrilaterals are cut off, and the buses are rounded. , The front end of the hair bundle is roughly formed in a hemispherical shape (see FIG. 4 (d)).

In the case of this 2nd Embodiment, the 1st bus bar rounding apparatus 28 has the uneven | corrugated pitch P of helical unevenness 25 = 2.8 mm, uneven | corrugated height t = 1.5 mm, and abrasive grain size = # 200, the disk rotational speed is set at 2000 rpm, using the first bus bar rounding device 28 to grind the tip end portion of the hair bundle 4 cut into a rough quadrilateral shape for 2.5 seconds, and the edge of the hair bundle front end. The tip is rounded with shaving, and the hair bundle tip is shaped into a rough hemispherical shape with a difference (d) = 1.5 mm between the height of the government and the bottom.

Subsequently, using the second bus bar rounding device 29, rounding processing of one of the hair bristles constituting the hair bundle 4 is performed. This 2nd bus bar rounding apparatus 29 is set to uneven | corrugated pitch = 3.0mm, uneven | corrugated height = 1.5mm, grinding | polishing particle size = # 800, disk rotation speed = 1500rpm, and this 2nd busbar rounding apparatus 29 ), The hair bristle front end portion shaped into a rough hemispherical shape is ground for 2 seconds, and the bus bar rounding process of one of the bristles of the hair bristle front end is performed.

Finally, the abrasive powder attached to the toothbrush was removed by air blowing in the hair powder removing device 30, and after the appearance inspection was performed, the toothbrush of FIG. 2 as a finished product was obtained.

In addition, although the said 1st and 2nd embodiment took the case where it cuts in two directions of the head side surface side and the head part longitudinal direction side on the cut of the hair | bristle tip front by a cutter, this cut direction Is not limited to two directions and may be configured to cut in three or more directions.

Since the test was performed about the influence of the tip shape of a hair | bristle bundle on the performance of a toothbrush, the result is shown below.

[1] evaluation tests for bristle tips

<Toothbrush specifications>

Handle: Polypropylene WP638C (manufactured by Sumitomo Chemical Co., Ltd.)

Slotted hole: Hole diameter = φ1.8 mm

           Slot Array = 2 + 4 + 4 + 4 + 4 + 2 (20 Holes)

           Pitch between the holes = 2.8 mm in the longitudinal direction of the head, 2.8 mm in the width direction

Features: Polyamide (Dupont), 6mil (0.152㎜) diameter

Simulation length: 10 mm, the difference between the height of the government and the bottom (d) = 2 mm

<Test method>

The shape of the hair | bristle bundle tip was changed and the sensory evaluation test of usability and usability was done. The results are shown in Table 1.

Subjects: 50

Period of use: 1 month

As is clear from the evaluation results in Table 1, the hair bundle tip shape having a high feeling of fitting to the gap between the teeth and the gum and having a soft and soft contact feeling is a rough hemispherical shape.

[2] evaluation tests for shearing dimensions

<Toothbrush specifications>

Handle: Polypropylene WP638C (manufactured by Sumitomo Chemical Co., Ltd.)

Hair hole: Hole arrangement = 2 + 4 + 4 + 4 + 4 + 2 (20 holes)

Distance between holes: 1 mm

Features: Polyamide (Dupont), 6mil (0.152㎜) diameter

Simulation length: 10㎜

Hair bundle tip shape: Rough hemispherical shape

<Test method>

Sensory evaluation of usability and usability was performed by changing the diameter of a seedling hole and the height of a government and a bottom part. The results are shown in Table 2.

Subjects: 50

Period of use: 1 month

From the evaluation result of Table 2, it became clear about the following.

(1) Since the diameter of the tuft hole is too small, the "soft and soft touch feeling" and the "feel of dirt falling" decrease, and when too large, the "feel of fitting to the clearance gap of a tooth and a gum" falls, so phi 1.7mm To about 2.3 mm is preferable.

(2) Because the difference between the height of the government and the bottom is too small, the mothership does not enter the gap, so if the feeling of fitting to the gap between the teeth and the gums decreases, and if too large, the soft and soft touch feeling decreases. , About 1.0 to 3.0 are preferred.

[3] evaluation tests for polishing conditions

<Toothbrush specifications>

Handle: Polypropylene WP638C (manufactured by Sumitomo Chemical Co., Ltd.)

Slotted hole: Hole diameter = φ2.0 mm

           Slot Array = 2 + 4 + 4 + 4 + 4 + 2 (20 Holes)

           Pitch between holes = 3.0 mm of head length direction, 2.4 mm of width direction

Features: Polyamide (Dupont), Diameter 6 mi1 (0.152 mm)

Simulation length: 10 mm, the difference between the height of the government and the bottom = 2 mm

<Test method>

The toothbrush sample of the above specification was subjected to two rounding operations by a bus bar rounding device using a disk-shaped polishing disk. The shaping aptitude by the difference of grinding | polishing conditions, such as particle size, was evaluated. The results are shown in Tables 3 and 4. In addition, the first rounding process is a process for rounding the hair | bristle front end surface cut mainly in the shape of a rough pyramidal shape into a rough hemispherical shape, and the 2nd rounding process subsequent to this is mainly of the hair | bristle front end rounded roughly in a hemispherical shape. It is a process for making one bus bar round.

Number of samples: 50

Rounding time: 2.5 seconds for each of the first and second rounding

From the evaluation result of said Table 3, Table 4, the following became clear.

(1) If the height of the spiral irregularities is too small with respect to the difference d between the height of the rough part and the bottom of the rough hemispherical portion, or the flat surface without the irregularities, the height of the spiral unevenness will not be sufficiently ground. Even if it is too large, the bristles do not touch the polishing surface sufficiently, so that the whole is not evenly ground. Therefore, it is preferable to make the uneven | corrugated uneven | corrugated height match the uneven | corrugated shape so that it may become a range within +/- 2 mm with respect to the difference d of the height of the rough part of a hemispherical part, and the bottom part.

(2) If the spiral pitch of the spiral irregularities is too small, the shape cannot be fully solved. If the spiral pitch is too large, the spiral pitch is too loose, and the irregularity effect is hardly exerted. Therefore, it is preferable that the helical uneven pitch is about the same as the pitch of the hair bundle, that is, the hole pitch of the tuft hole.

(3) As for the abrasive grain size in the rough hemispherical rounding process of the 1st hair | bristle bundle tip, about # 100-# 400 are preferable. If the particle size is too small, the removal of the burr and the shaping into a rough hemispherical shape deteriorate. If the particle size is too large, adequate frictional resistance cannot be exhibited, so that sufficient abrasiveness cannot be exhibited.

(4) As for the abrasive grain size in the rounding process of one of the 2nd chain hairs, about # 400-# 800 are preferable. In one rounding of a single bristle, since grinding property as high as the rough hemispherical rounding process of the 1st hair | bristle bundle front end surface is not needed, grinding | polishing particle size should be smaller.

Explanation of symbols

1 head 2 hair transplant

3: hair follicle 4: hair

5: neck portion 20: busbar processing device

21: Chuck 22: Horizontal Cutter

23: vertical cutter 24: polishing surface

25: spiral irregularity 26: disk-shaped polishing disk

27: motor 28: first bus bar rounding device

29: second bus bar rounding device 30: hair removal device

d: difference between the height of the hemisphere and the bottom of the hemisphere

h: simulation length L: hair length

p: helix pitch R: direction of rotation

t: uneven height w: hair width

Claims (5)

delete delete delete As a bus bar processing method for manufacturing the flat bristle toothbrush whose diameter of the tuft hole formed in the toothbrush head part was 1.7-2.3 mm, and the tip shape of the hair | bristle bundle implanted in the tuft hole became a hemispherical shape, Cutting the hair bristle front end with a cutter in a plurality of different directions with respect to the toothbrush head, and forming the hair bristle front end in a hemispherical shape by rounding the cut hair bristle front end with a bus bar rounding device. Done, As the bus bar rounding device, a bus bar rounding device having a rotating polishing disk is used, and the spiral surface of the polishing disk is formed to form spiral spirals in a radial cross section from the disk center to the outside, The spiral pitch of the spiral irregularities is set equal to the pitch between the holes of the tuft holes, and the difference in height of the spiral irregularities is set equal to the difference between the height of the hemisphere and the bottom of the hemispherical portion. And the abrasive grain size of the polishing surface formed of the spiral irregularities is set in the range of # 100 to # 800. 5. The method of claim 4, The rounding process includes a first rounding process using an abrasive disk having a polishing particle size # 100 to # 400 of the polishing surface, And a second rounding process using a polishing disk having a polishing particle size # 400 to # 800 of the polishing surface.

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