KR20150060661A - Tapered bristles, method for manufacturing same, and toothbrush provided with tapered bristles - Google Patents

Abstract

A tapered steel matrix aggregate portion in which three to ten or less resin tapered steel matrix bodies each having a tapered portion at each tip end are disposed adjacent to each other and a side surface of the tapered steel matrix main body And the covering portion covers all or a part of the side surface excluding the tapered portion of the tapered steel base body, and these side surfaces are bonded to each other, and the tapered portion of each tapered steel base body Wherein the outer edge portion of the tapered bristles protrudes to the outside of the covering portion.

Description

TECHNICAL FIELD [0001] The present invention relates to a tapered bristle, a method of manufacturing the same, and a toothbrush having a tapered bristle,

The present invention relates to a tapered bristle having a structure in which a tip portion is branched, a method of manufacturing the same, and a toothbrush provided with tapered bristles.

The present application claims priority based on Japanese Patent Application No. 2012-211159 filed on September 25, 2012, the contents of which are incorporated herein by reference.

As a special bristle that can smoothly touch the inside of the periodontal pocket with soft touch of the tip for preventing periodontal disease, the tapered tapered hair (ultrafine hair) is widely used. As an example of the sharpening taper, a bristle diameter at each of the portions of 1 mm, 3 mm, 5 mm, and 8 mm from the tip of the taper is 25 to 35% and 55% to the outer diameter of the bristle base at the tip of the monofilament made of synthetic resin. To 70%, 80 to 90%, and 90 to 100% of the thickness of the toothbrush, and the toothbrush is configured such that the monofilament is placed at the distal end of the toothbrush handle.

However, since this type of sharp tapered taper is extremely gathers, contact with the gums is weak, and there is a problem that the sensation of cleaning is insufficient.

For this reason, the tip branching shoe is being studied for the purpose of improving the cleaning feeling of the sharpened taper mock better. Its representative structure is a structure in which bristles of a cross-sectional shape are branched and bristled (see Patent Document 1) and a bristle tip such as a sea-island structure is branched (see Patent Document 2).

The triangular taper mower disclosed in Patent Document 1 has a structure in which the tip ends of the cross-section clover type bristles are divided into a plurality of sections and the tip portions of the branch simulations are formed into the tapered shape of the sharpening, and the tapered- And it is a structure that can suppress the occurrence of pain on the gum by setting the modulus of elasticity of one bristle to an appropriate value.

The sharpened tapered shoe described in Patent Document 2 employs a structure in which bristles of a toothbrush are composed of a composite fiber composed of a skin layer and a core layer of a resin which do not adhere to each other and the tip is polished and divided into a plurality, And the removal effect of the dung is also greatly enhanced.

Japanese Patent Laid-Open No. 2001-169827 Japanese Patent Application Laid-Open No. 9-98837

The toothbrush described in Patent Document 1 has a drawback in that it has a good interdental cleanliness, a soft contact with the gum and a high sensation of brushing, but the cross-section clover-shaped bristles tend to be split at the time of use or during use.

In addition, the toothbrush described in Patent Document 2 has a disadvantage in that the branch hair is denser than the outer circumferential position on the bristle tip side, so that sufficient brushing sensation can not be obtained by providing branch hair.

In order to solve the above problems, the present inventors have found that a tapered bristle having a soft contact with the gum, an excellent entry into periodontal pockets, an excellent brushing sensation, and a tapered bristle with a bristle- And a toothbrush provided with the tapered bristles.

In order to achieve the above object, the present invention adopts the following configuration.

The tapered bristle of the present invention comprises a tapered steel matrix aggregate portion in which three or more resin tapered steel matrix bodies each having a tip end as a tapered portion are disposed adjacent to each other and a side surface of the tapered steel matrix body constituting the tapered steel matrix aggregate portion And a covering portion made of resin which covers the side surfaces of the adjacent tapered steel base bodies integrally with each other, the side surfaces of the tapered steel base excluding the tapered portions of the tapered steel base body are bonded to each other, And is attached to the side surface of the tapered steel matrix so as to protrude the outer edge of the side surface of the matrix to the outside of the cover.

In the tapered bristle of the present invention, the tapered steel matrix and the covering portion are made of different resins, and the tapered portion of the tapered steel matrix is formed by immersion by the dissolving liquid, and the melting of the resin constituting the covering portion And the solubility of the resin constituting the tapered steel matrix is higher than the solubility of the resin constituting the tapered steel matrix in the dissolution liquid.

In the tapered bristle of the present invention, the tapered steel matrix aggregate portion is formed by closely adhering the side surfaces of the three or more tapered steel matrix bodies at the center side thereof, and the covering portion is a tightly integrated portion So as to cover the side surface of the tapered steel base body.

In the tapered bristle of the present invention, it is preferable that the tapered steel matrix aggregate portion has a bristle-shaped covering portion covering at least three adjacent tapered steel mattresses, and the side edge of the tapered steel body protrudes from the side surface of the covering portion And the remaining portion may be buried in the bristle-shaped covering portion.

In the tapered bristle of the present invention, the protruding width of the outer edge of the tapered steel base protruded outward from the covering portion is 5 to 50% of the diameter of the tapered steel base, the protruding height is 10 To 80%.

In the tapered bristle of the present invention, the portion excluding the tapered portion of the tapered steel matrix aggregate portion may be formed in a petal shape in cross section formed by three or more tapered steel matrix bodies having a cross-section polygonal shape or a cross-sectionally substantially elliptical shape.

The toothbrush of the present invention is characterized in that the tapered bristles described in any one of the preceding claims are formed on the head portion.

A method of manufacturing a tapered bristle of the present invention comprises a tapered steel matrix aggregate portion in which three or more resin tapered steel matrix bodies each having a tip end as a tapered portion are disposed adjacent to each other, And a cover made of a resin which is integrated with adjacent side portions of the tapered steel base body to cover adjacent side portions of the tapered steel base body, the cover portion being coated on a side surface excluding the tapered portion of the tapered steel base body, Wherein the outer edge of the side surface of the tapered bristle protrudes outside the covering portion,

In the case of forming the bristle covering body by covering the bristle material parts in which three or more bristle material parts are arranged adjacent to each other with a covering member made of resin, any of the resin constituting the bristle material and the resin constituting the covering member, Wherein a resin having solubility is used and a resin having a solubility in the dissolving liquid of the resin constituting the covering member is higher than a solubility of the resin constituting the bristle material in the dissolving liquid is used, A tapered portion is formed at the tip of each bristle material to form a tapered steel matrix by dipping the bristle covering material in the dissolution liquid after the covering member is attached to form a bristle covering body, The peripheral coating member is dissolved and removed to cover the side surface of the tapered steel matrix except for the tapered portion It characterized by forming the abdomen.

 That is, the present invention relates to the following.

[1] A taper steel base assembly comprising three or more and ten or less resin tapered steel base members each having a tapered portion at an end,

And a resin-made covering portion covering all or a part of a side surface of the tapered steel base so that the side surfaces of the tapered steel base are joined and integrated,

Wherein the covering portion covers all or a part of the side surface excluding the tapered portion of the tapered steel base body and joins the side surfaces with each other,

And the outer edge portion of the tapered steel matrix body excluding the tapered portion protrudes outside the cover portion.

[2] The taper steel base and the covering portion are made of other resin,

Wherein the tapered portion of the tapered steel base body is a tapered portion formed by dipping in a dissolution liquid,

Wherein the solubility of the resin constituting the covering portion to the dissolving liquid is greater than the solubility of the resin constituting the tapered steel matrix to the dissolving liquid.

[3] The tapered steel matrix assembly according to [1], wherein the side surfaces of the respective tapered steel matrix bodies are tightly integrated with each other on the center side of the cross-

The tapered bristle according to [1] or [2], wherein the covering portion covers a side surface of the tightly integrated portion of each tapered steel matrix.

[4] The cladding portion is a bristle-shaped covering portion covering each of the adjacent taper steel main bodies,

The outer edge portion of the tapered steel base excluding the tapered portion protrudes to the outside of the covering portion,

The tapered bristle according to [1] or [2], wherein a portion of the tapered steel base excluding the tapered portion is embedded in the bristle-shaped covering portion except for the outer edge portion.

[5] A method for manufacturing a tapered steel body, comprising the steps of: [5] providing a tapered steel base body having a protruding width of 5 to 50% of the diameter of the tapered steel base body and a protruding height of 10 to 80% The tapered bristle according to any one of [1] to [4].

[6] The tapered steel matrix assembly according to any one of [1] to [5], wherein at least three tapered steel bodies of a cross-sectional polygonal shape or cross-sectional oval shape are gathered around the center axis of the tapered bristles The tapered bristle according to any one of [1] to [5].

[7] A toothbrush in which the tapered bristles described in any one of [1] to [6] are provided on the head portion.

[8] A taper steel base assembly comprising three or more, ten or less tapered steel base members each having a tapered portion at the tip of each taper,

And a resin-made covering portion covering all or a part of a side surface of the tapered steel base so that the side surfaces of the tapered steel base are joined and integrated,

Wherein the covering portion covers all or a part of the side surface excluding the tapered portion of the tapered steel base body and joins the side surfaces with each other,

The outer edge portion of the tapered steel matrix excluding the tapered portion of the tapered steel matrix protrudes to the outside of the covering portion,

In the above manufacturing method,

Forming a bristle covering body by covering the bristle material with three or more but not more than 10 bristle materials adjacent thereto with a resin covering member;

Forming a tapered portion at the tip of each bristle material by immersing the tip side of the bristle cover body in the solution and then raising it; And

And melting the coating member around the tapered portion to form a covering portion covering the side surface portion excluding the tapered portion of the bristle material having the tapered portion,

The resin constituting the bristle material and the resin constituting the covering member are both resins having solubility in the solution,

Wherein the solubility of the resin constituting the covering member to the dissolving liquid is greater than the solubility of the resin constituting the bristle material to the dissolving liquid.

(Effects of the Invention)

According to the present invention, since the tapered portion is provided at the distal end of each tapered steel matrix, entry into the periodontal pocket is excellent, and at least three tapered steel matrixes are integrated by the covering portion. The strength of the hair elasticity can be increased as compared with the independent structure, so that the sense of brushing can be improved. In addition, since the covering portion is formed so as to exclude the tapered portion, toothpaste can be maintained on the tip side of the covering portion and in the area surrounded by the tapered portion, thereby effectively supplying the effective ingredient of the toothpaste to the inside of the periodontal pocket.

Further, in the case of manufacturing a toothbrush, when three or more tapered steel matrix bodies are combined at the covering portion in a case where the head portion is formed by using a flat-type eating mosquito, Problems are hard to occur.

1A is a side view of a toothbrush with tapered bristles according to one embodiment of the present invention.
1B is a plan view of tapered bristles according to an embodiment of the present invention.
1C is a perspective view of tapered bristles according to one embodiment of the present invention.
2A is a perspective view showing a bristle covering body before a dissolution treatment in a method of manufacturing a tapered bristle according to an embodiment of the present invention.
Fig. 2B is a perspective view showing tapered bristles after dissolution treatment in a method of producing tapered bristles according to an embodiment of the present invention. Fig.
3A is a plan view of a tapered bristle according to another embodiment of the present invention.
3B is a perspective view of a tapered bristle according to another embodiment of the present invention.
4A is a plan view of tapered bristles according to another embodiment of the present invention.
4B is a perspective view of a tapered bristle, which is another embodiment of the present invention.
5A is a plan view of a tapered bristle, which is another embodiment of the present invention.
5B is a perspective view of a tapered bristle, which is another embodiment of the present invention.
6A is a plan view of a tapered bristle, which is still another embodiment of the present invention.
6B is a perspective view of a tapered bristle, which is another embodiment of the present invention.
7A is a plan view of a tapered bristle, which is still another embodiment of the present invention.
7B is a perspective view of a tapered bristle, which is another embodiment of the present invention.

≪ First Embodiment >

Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.

Fig. 1A is a view showing a toothbrush A in which a tapered bristle according to the first embodiment is molded. The toothbrush (A) has a head part 2, a neck part 3 and a grip part 4, which are provided with a plurality of hair bundles 1, and the head part 2, And the grip portion 4 are made of a hard resin material.

The hard resin constituting the head part 2, the hand part 3 and the grip part 4 may be a polypropylene resin or a polyester resin. However, a two-color molded article in which the periphery of the hard resin is coated with a soft resin Maybe.

As the soft resin, for example, an elastomer resin such as a polyolefin elastomer, a styrene elastomer, or a polyester elastomer can be mentioned.

The resin used herein may be any resin that can be applied to a general toothbrush.

The hair bundle 1 provided on the head portion 2 of the toothbrush A can be formed by winding the tapered bristles 5 to be described below at a filling rate of 70 to 95% , And the bundle of tapered bristles 5 is deformed into a V-shape by using a plain line (not shown), and is stitched by being inserted into a hair-removal hole of the head portion 2 (not shown). In addition, the method of setting the bundle of the tapered bristles 5 on the head portion 2 is not limited to the above-mentioned flat wire structure, and any of the methods for forming the bristles on a general toothbrush may be used.

The tapered bristle 5 in the present embodiment has four tapered steel base bodies 6 made of resin as shown in Figs. 1B and 1C.

The tapered steel matrix 6 is integrally formed adjacent to the central portion of the transverse section of the tapered bristles 5 and all or a part of the side surface of the adjacent integrated portion is covered with a covering portion 7 made of resin.

A tapered portion 6A whose tip is narrowed is formed at the tip end side of the tapered steel base 6. In the tapered steel matrix 6, the portion excluding the tapered portion 6A is the base portion 6B. The base portion 6B has an arbitrary cross-sectional shape in the axial direction. In addition, the term " the same cross-sectional shape " as used herein is to be substantially the same, and for example, even if there is a difference of 0% or more and 15% or less in the cross-

The base portion 6B of the tapered steel matrix 6 of the present embodiment has an inner edge portion 6a located on the center side of the tapered bristle 5 on the cross section of the base portion 6B, And the width of the outer edge portion 6b located on the outer peripheral side of the tapered bristles 5 is formed to be smaller than the width of the intermediate portion 6c therebetween.

In the specification and claims, the term " oval shape " includes circular, oval, rectangular, elliptical, and the like, and preferably has at least one axis of symmetry.

The term " width of the inner edge portion 6a " as used herein means an imaginary circle formed by the outer periphery of the covering portion 7 having the center and the center of the tapered bristle 5, (5B) and a center of the tapered bristles (5) is drawn, and a straight line connecting the center of the tapered bristles (5) at a position apart from the center of the tapered bristles And the outer edge of the base portion 6B are connected to each other.

The term " width of the outer edge portion 6b " refers to the width of the tapered bristles 5, which connects the intersection of the imaginary circle constituted by the outer periphery of the covering portion 7 having the center and the center of the tapered bristle 5 and the outer edge of the base portion 6B (That is, the portion of the base portion 6B which is located on the side opposite to the center of the tapered bristle 5 with respect to the auxiliary line of the base portion 6B) of the base portion 6B when the auxiliary line is drawn Means the maximum value of the distance between the outer edge of the portion in the vicinity of the auxiliary line and an arbitrary straight line parallel to the auxiliary line.

The width in the intermediate portion 6c means an imaginary circle constituted by the outer periphery of the covering portion 7 having the center and the center of the tapered bristles 5, The auxiliary line connecting the middle point of the intersection of the outer edge and the center of the tapered bristles 5 is drawn so that the intermediate portion 6c between the inner edge portion 6a and the outer edge portion 6b intersects the auxiliary line 6c perpendicularly Means the maximum value of the distance between the intersection of the straight line and the outer edge of the base 6B.

In this embodiment, the tapered bristles 5 are formed by assembling the four base portions 6B in such a manner that the tapered steel matrix 6 is gathered around the central axis of the tapered bristles 5 as shown in Fig. 1C, The tapered steel matrix aggregate portion 9 is formed and the side surface portion of the tapered steel matrix aggregate portion 9 is partially covered with the covering portion 7 to form the tapered bristles 5. 1C, only the shape of one end side of the tapered bristles 5 is drawn, but the other end side of the tapered bristles 5 also has the same shape as that of FIG. 1C by forming the tapered portion 6A. As described above, the bundle of tapered bristles 5 is deformed into a V-shape so that the head portion 2 is flattened by deforming the bundle of tapered bristles 5 into a V-shape, as described above, A toothbrush A having a plurality of hair bundles 1 having the constitution shown in Fig. 1A can be constituted.

The bristle diameter a (corresponding to a in Fig. 1B) of the tapered steel matrix 6 is such that in the case of the present embodiment, the four tapered steel matrixes 6 are gathered around the central axis of the tapered bristles 5, The distance from the center position of the tapered bristles 5 to the distal end of the outer edge portion 6b of one base portion 6B (i.e., the distance between the center and the center of the tapered bristles 5 in the cross- An auxiliary line connecting the center of the tapered bristle 5 with the center of gravity at the intersection of the virtual circle and the outer edge of the base portion 6B is defined as an imaginary circle constituted by the outer periphery of the covering portion 7, (The distance from the intersection of the auxiliary line to the outer edge of the base portion 6B to the center of the tapered bristle 5 when the bristle cap 1 is tilted), the bristle diameter a can be about 50 to 150 mu m , And the bristle diameter (a) is more preferably selected in the range of about 70 m to 130 m .

It is preferable that the length of the tapered portion 6A on the tip side of the tapered steel matrix 6 (i.e., the maximum distance in the longitudinal direction of the tapered portion) is about 0.5 mm to 5.0 mm. The term " center of the tapered bristles " herein means the center of the tapered bristles, which is in contact with the outer edge of at least one tapered steel matrix on the cross section of the base portion of the tapered bristles, and which covers all of the cross section of the base portion of the tapered bristles, Means the center of the virtual circle when the circle is drawn.

Assuming that the diameter of the imaginary circle 8 connecting the outermost portion of the tapered steel matrix 6 to the center of the tapered bristles 5 is the bristle diameter b of the tapered bristles 5 , And the bristle diameter (b) is preferably in the range of about 100 mu m to 300 mu m, more preferably in the range of about 150 mu m to 250 mu m.

The maximum width of the rounded cross section to which the round is imparted is preferably in the range of about 10 mu m to 100 mu m. The number of tapered steel base bodies 6 for constituting the tapered bristles 5 is not limited to four as in the present embodiment, but is preferably about three to five.

The bristle diameter (b) as the tapered bristles 5 needs to be made as small as that of the tapered bristles 5 if the number of the tapered steel base bodies 6 is increased as described above, The cleaning property is deteriorated.

In the four base portions 6B constituting the four tapered steel matrixes 6, the outer side from the portion of the inner side edge portion 6a of the two adjacent base portions 6B to the portion of the middle portion 6c (That is, the side surface). That is, the inner edge portion 6a to the intermediate portion 6c of the adjacent two base portions 6B correspond to adjacent side portions of the base portions 6B, and the covering portion 7 Is formed. The outer peripheral surface of the covering portion 7 is curved so as to constitute a part of the circumferential surface having the center and the center of the tapered bristles 5, As shown in Fig. 1 (b).

The protruding width W1 of the outer edge portion 6b is set to about 10 to 100 mu m so that the protruded portion of the tapered steel matrix 6 protruding outward from the covering portion 7 becomes the outer edge portion 6b. And the protruding height H1 of the outer edge portion 6b projecting outward from the covering portion 7 is about 10 to 80 m.

The term " projecting width " in this specification and claims means that, when an auxiliary line connecting the intersection of an imaginary circle formed by the outer periphery of the covering portion having the center and the center of the tapered bristle and the outer edge of the base portion is drawn, (That is, a portion located on the side opposite to the central side of the tapered bristles with respect to the auxiliary line of the base portion) and a portion of the outer edge of the portion of the side of the auxiliary line parallel to the auxiliary line It means the maximum value of the distance of intersection of straight line.

The term "projecting height" in the present specification and claims refers to an imaginary circle formed by the outer periphery of a covering portion having the center and the center of the tapered bristle on the cross section of the tapered bristle, and the intersection of the imaginary circle and the outer edge of the base portion From the center of the tapered bristles to the outer periphery of the covering portion from the distance connecting the intersection of the auxiliary line and the outer edge of the base portion to the center of the tapered bristle when the auxiliary line connecting the center of the tapered bristles is drawn. The distance to the outer circumference of the virtual circle is subtracted.

The projecting width W1 is preferably in the range of 5 to 50% of the bristle diameter a of the tapered steel base 6 because the bristle diameter a of the tapered steel base 6 is about 50 to 150 mu m Do.

It is preferable that the protruding height H1 be in the range of 10 to 80% of the bristle diameter a of the tapered steel base 6.

The resin constituting the tapered steel matrix 6 and the covering portion 7 is preferably made of a polyester resin from the viewpoint of workability. Further, polyesters such as PET (polyethylene terephthalate), PTT (polytrimethylene terephthalate), PBT (polybutylene terephthalate) and PBN (polybutylene naphthalate); Polyamides such as 612 nylon and 610 nylon; And polyolefins such as polyethylene (PE) and polypropylene (PP), among which polyesters are preferable because they are easy to process. These resins can be used in combination of two kinds, but monofilaments made of a single material are preferable from the viewpoints of investment cost, maintenance property, and appearance quality stability of the manufacturing facility. The resin constituting the tapered steel matrix 6 and the covering portion 7 is not limited to monofilaments but may be composed of multifilaments having a multilayer structure.

When the tapered portion 6A is formed on the tapered steel matrix 6, it may be tapered after being immersed in the dissolution liquid. Since sodium hydroxide or a hydrolysis solution is used as the dissolution solution in this case, It is preferable to select a resin having a different solubility to the dissolution liquid.

In the present embodiment, when the tapered steel matrix 6 is formed of (PBT) as an example of the combination, the covering layer 7 can be formed of (PET). As another example of the combination, when the tapered steel matrix 6 is formed of (PBN), the coating layer 7 can be formed of (PBT).

A toothbrush A having a tapered bristle 5 shown in Figs. 1A to 1C has a plurality of tapered bristles 5 each having four tapered bridged bodies 6 each having a tapered portion 6A Therefore, the tapered steel matrix 6 is excellent in the ability to enter the periodontal pocket. Therefore, in the present embodiment, the periodontal pocket is excellent in brushing property and is excellent in sensation of cleaning. In the present embodiment, four tapered steel base bodies 6 are integrally covered with the covering portion 7 so that four tapered steel base bodies 6 are combined into one tapered bristle 5, It is possible to increase the elastic modulus of elasticity of the tapered steel matrix 6 and to provide a better feeling of brushing teeth and tooth buds than the structure having the tapered steel matrix 6 formed independently of the tapered steel matrix 6.

When a toothbrush A having the tapered bristles 5 shown in Figs. 1A to 1C is used, it is a space between the four tapered portions 6A. In the portion of the front end space of the four covering portions 7, Lt; / RTI > Therefore, in this embodiment, there is an effect that the effective component of the toothpaste can be reliably supplied to the inner deep portion of the periodontal pocket while the toothpaste is held on the tip side of the tapered bristles 5.

When the tapered bristles 5 shown in Figs. 1B to 1C and Figs. 2A to 2B are to be molded, a part of the side surfaces of the four tapered steel matrix bodies 6 is covered and restrained by the covering portion 7, The tapered steel matrix 6 is bent by using the tapered steel matrix 6, thereby preventing the four tapered steel matrixes 6 from being separated individually.

It is also possible to suppress the possibility that the tapered bristles 5 are cracked during the wiping operation, as compared with the structure in which the periphery of the tapered steel matrix 6 is restrained by the covering layer 7 during use of the toothbrush (A).

<Manufacturing Method>

The tapered bristles 5 having the structure shown in Figs. 1B and 1C can be manufactured by the method described below as an example.

First, to constitute the tapered steel matrix 6, the bristle covering body 10 having a cross-sectional shape shown in Fig. 2A is spun by two materials of release by using (PBT) resin and (PET) resin. A cut piece having a cut length of about 25 to 35 mm is obtained from the radiator to obtain a bristle covering body 10 having a required length. The bristle covering body 10 is constituted by four bristle materials 11 of cross-sectional oval shape made of (PBT) resin, which are adjacent to each other so as to be gathered around the central axis of the bristle covering body 10, And four covering members 13 made of a (PET) resin integrally molded on the side surface of the material bristle portion 12 so as to partially cover the side surface of the material bristle portion 12. [

Subsequently, a solution such as an acid or an alkali solution is prepared to form a tapered portion at the tip of the bristle covering member 10, and one end of the bristle covering member 10 is immersed in the required time solution for lifting, neutralizing, Treatment and the like.

As an example of the solution treatment, when a polyester resin is used as the resin constituting the raw steel base material 12, it is preferable to use a solution temperature of 120 to 120 ° C using a hot alkali or a heated acid, preferably 40 to 50 wt% It is possible to perform the treatment of immersing one end of the bristle covering body 10 on the dissolving layer at 140 占 폚 and pulling up the same.

The dissolving solution can be determined depending on the resin to be used. For example, in addition to the sodium hydroxide solution, an alkali solution such as a potassium hydroxide solution, an acidic solution such as a sulfuric acid bath, and an organic solvent can be given.

Thereafter, it is possible to obtain a bristle cut piece which is subjected to a neutralization, washing and drying process to be tapered.

When the solution concentration or the heating temperature of the dissolving liquid is lower than the above-mentioned conditions, the heating efficiency is lowered. If the solution concentration or the heating temperature of the dissolving liquid is excessively higher than the above-mentioned condition,

For example, when the bristle covering member 10 having the structure shown in Fig. 2A is treated with a solution of NaOH solution as described above, the solubility of the bristle material 11 made of the (PBT) resin is lower than the solubility of the covering member The tapered portion 6A can be formed at the tip end of the bristle material 11 and the coating member 13 existing between the tapered portions 6A can be dissolved and removed Whereby the tapered bristle 5 having the shape shown in Fig. 2B can be obtained.

As described above, the tapered bristles 5 having the shape shown in Fig. 2B are formed while simultaneously performing the processing of the tapered portion 6A and the processing of the covering portion 7 by immersing the one end of the bristle covering body 10 in the dissolution liquid, Can be obtained. This is because the solubility of the resin constituting the covering portion 7 to the dissolving liquid is higher than the solubility of the resin constituting the tapered portion 6A in the dissolving liquid, The structure shown in Fig. 2B can be easily and reliably produced by the combination of the material of the material constituting the substrate 7 and the solution.

&Lt; Second Embodiment >

3A and 3B are views showing a tapered bristle 15 according to a second embodiment of the present invention. FIG. 3A is a plan view of a tip end portion of the tapered bristle 15, and FIG. 3B is a perspective view of the tapered bristle 15.

The tapered bristle 15 according to the second embodiment of the present invention shown in Figs. 3A to 3B is similar to the tapered bristle 5 of the first embodiment described earlier in order to construct a toothbrush by being hung on a head made of a hard resin Is used.

The tapered bristles 15 of this embodiment are formed by integrally forming the four tapered steel bodies 16 made of resin on the center side of the transverse section of the tapered bristles 15 as shown in an enlarged view in Fig. 19, and all or a part of the side surface of the integrated portion is covered with a covering portion 17 made of resin. The tapered steel base 16 has a tapered portion 16A having a tip end narrowed. In the tapered steel matrix 16, the portion excluding the tapered portion 16A is the base portion 16B. The base portion 16B has an arbitrary cross-sectional shape in the axial direction. In addition, the term &quot; the same cross-sectional shape &quot; as used herein is to be substantially the same, and for example, even if there is a difference of 0% or more and 15% or less in the cross-

The base portion 16B of the tapered steel base body 16 of the present embodiment has an inner edge portion 16a located on the center side of the tapered bristle 15 on the cross section of the base portion 16B, Sectional shape formed so as to gradually increase gradually in the order of the width of the intermediate portion 16c and the width of the outer edge portion 16b.

Further, in the cross-section polygonal shape in the present embodiment, four base portions 16B having a rectangular cross-section are arranged so as to be integrated at the central portion side of the transverse section of the tapered bristles 15.

The term "width of the inner edge portion 16a", "width of the outer edge portion 16b", and "width of the middle portion 16c" referred to herein means "width of the inner edge portion 6a" Quot ;, &quot; width of outer edge portion 6b &quot;, and &quot; width of middle portion 6c &quot;.

In this embodiment, the tapered bristles 15 are formed by integrating the four base portions 16B, as shown in Fig. 3A, of the tapered steel base body 16 around the center axis of the tapered bristle 15, A tapered bristle 15 is formed by partially covering the side surface of the tapered portion 17 with the covering portion 17. The projecting width of the outer side edge portion 16b projecting to the outside of the covering portion 17 is W2, and the projecting height is H2.

3B shows only one end of the tapered bristle 15, but the other end of the tapered bristle 15 has the same shape as that of FIG. 3B by forming the tapered portion 16A. The tapered bristles 15 are deformed into a V-shape and are laid flat on the head portion of the toothbrush so that the toothbrush 15 .

 The bristle diameter a of the tapered steel base body 16 is set such that the four tapered steel base bodies 6 in the case of this embodiment are gathered around the central axis of the tapered bristle 15, (That is, the distance from the center of the tapered bristle 15 to the tip of the outer edge portion 16b of the base portion 16B) When an auxiliary line connecting an imaginary circle constituted by the outer periphery and the center of the tapered bristles 15 at the intersection between the imaginary circle and the outer edge of the base portion 6B is drawn, (The distance from the intersection of the outer edge of the bristles 16B to the center of the tapered bristles 5), the bristle diameter a can be about 50 to 150 mu m, It is more preferable to select a range of about 70 mu m to about 130 mu m. It is preferable that the length of the tapered portion 16A on the tip side of the tapered steel base 16 (i.e., the maximum distance in the longitudinal direction of the tapered portion) is about 0.5 mm to 5.0 mm.

Assuming that the diameter of the virtual circle 18 connecting the outermost portion of the four tapered steel bodies 16 to the center of the tapered bristles 15 is the bristle diameter b of the tapered bristles 15, ) Is preferably in the range of about 100 mu m to 300 mu m, more preferably in the range of about 150 mu m to 250 mu m.

The maximum width of the rounded cross section to which the round is imparted is preferably in the range of about 10 mu m to 100 mu m.

In the tapered bristles 15 shown in Figs. 3A and 3B, the tapered portion 16A is easily inserted into the periodontal pocket because the tapered bristles 5 of the first preferred embodiment are tapered. Therefore, the tapered bristles 15 are excellent in the ability to enter the periodontal pocket, and are excellent in brushing property in the periodontal pocket, and are excellent in sensation of cleaning. Further, in this embodiment, since the tapered bristle tufts 15 are formed by integrating the four tapered steel bases 16, an effect that the modulus of elasticity is high can be obtained as in the first embodiment. In the present embodiment, the toothpaste can be held in the space between the four tapered portions 16A, and the toothpaste can be supplied to the inner portion of the periodontal pocket as in the case of the tapered bristle 5 in the front, It is possible to prevent the taper bristles 15 from being split.

The manufacturing method of the tapered bristle 15 having the structure shown in Figs. 3A to 3B can be manufactured by the same method as the manufacturing method described with reference to Figs. 2A to 2B.

The number of tapered steel base bodies 16 for constituting the tapered bristles 15 may be appropriately changed as long as they have the effect of the present invention, and may be, for example, from 2 to 10.

&Lt; Third Embodiment >

4A is a plan view of the tip end portion of the tapered bristle 25, and FIG. 4B is a perspective view of the tapered bristle 25 (FIG. 4A). FIGS. 4A and 4B are views showing the tapered bristle 25 of the third embodiment according to the present invention .

The tapered bristles 25 according to the third embodiment shown in Figs. 4A to 4B are used to form a toothbrush in a head portion made of a hard resin like the tapered bristles of the first and second embodiments.

The tapered bristles 25 of this embodiment are formed by integrating three resin-made tapered steel bodies 26 on the center side of the transverse section of the tapered bristles 25 as shown in an enlarged view in Fig. 4A, And the whole or a part of the side surface of the integrated portion is covered with a covering portion 27 made of resin.

A tapered portion 26A whose tip is narrowed is formed at the tip side of the tapered steel base 26. [ In the tapered steel matrix body 26, the portion excluding the tapered portion 26A is the base portion 26B. The base portion 26B has an arbitrary cross-sectional shape in the axial direction.

In addition, the term &quot; the same cross-sectional shape &quot; as used herein is to be substantially the same, and for example, even if there is a difference of 0% or more and 15% or less in the cross-

The base portion 26B of the tapered steel base body 26 of the present embodiment is formed so that the base portion 26B of the tapered steel base 26 is located on the side of the inner side edge portion 26a located on the side of the center portion of the tapered bristle 25 on the cross section of the base portion 26B The width of the intermediate portion 16c, and the width of the outer edge portion 16b in this order. Further, in the cross-section polygonal shape in the present embodiment, three base portions 26B having a quadrilateral cross section are arranged so as to be integrated at the central portion side of the transverse section of the tapered bristles 25.

The width of the inner edge portion 26a, the width of the outer edge portion 26b and the width of the intermediate portion 26c in this embodiment mean the width of the inner edge portion 6a Quot ;, &quot; width of outer edge portion 6b &quot;, and &quot; width of middle portion 6c &quot;.

In the tapered steel matrix 26 of this embodiment, the tapered bristles 25 are arranged in such a manner that the three base portions 26b are formed so that the tapered steel matrix 26 is located at the center of the central axis of the tapered bristles 25 And the tapered bristles 25 are formed by partially covering these side surfaces with the covering portion 27. The tapered bristles 25 are formed in the shape of a tapered bristle.

The projecting width of the outer side edge portion 26b projecting to the outside of the covering portion 27 is W2 and the projecting height is H2.

4A shows only one end of the tapered bristle 25, but the other end of the tapered bristle 25 has the same shape as that of FIG. 4B by forming a tapered portion 26A or the like. The tapered bristles 25 are deformed into a V-shape so as to be flush with the head portion of the toothbrush by a flat line, .

The structure of the tapered bristles 25 shown in Figs. 4A to 4B is similar to the structure of the tapered bridges 25 shown in Figs. 3A to 3B except that the tapered steel base 16 made of four base portions 16b provided in the tapered bristles 15 And a base portion 26b.

The bristle diameter (a) of the tapered steel base body 26 is set such that three tapered steel base bodies 26 in the case of this embodiment are gathered around the central axis of the tapered bristles 25, Of the tapered bristles 25 from the center of the tapered bristles 25 to the distal end of the outer edge portion 26b of one base portion 26B When an auxiliary line connecting an imaginary circle constituted by the outer periphery and the center of the tapered bristle 25 is drawn on the intersection between the imaginary circle and the outer edge of the base portion 26B, (The distance from the intersection of the outer edge of the tapered bristles 26B to the center of the tapered bristles 25), the bristle diameter a can be about 50 占 퐉 to 150 占 퐉, It is more preferable to select a range of about 70 mu m to about 130 mu m. It is preferable that the length of the tapered portion 26A on the tip side of the tapered steel base 26 (that is, the maximum distance in the longitudinal direction of the tapered portion) is about 0.5 mm to 5.0 mm.

Assuming that the diameter of the imaginary circle 28 connecting the outermost portion of the three tapered steel bodies 26 and the center of the tapered bristles 25 is the bristle diameter b of the tapered bristles 25, ) Is preferably in the range of about 100 mu m to 300 mu m, more preferably in the range of about 150 mu m to 250 mu m. The maximum width of the rounded cross section to which the round is imparted is preferably in the range of about 10 mu m to 100 mu m.

In the tapered bristles 25 shown in Figs. 4A and 4B, similarly to the tapered bristles 5 of the first embodiment, the tapered portion 26A can easily be inserted into the periodontal pocket because of tapering. Therefore, the tapered bristles 25 are excellent in the ability to enter the periodontal pocket, and are excellent in brushing property in the periodontal pocket, and are excellent in sensation of cleaning. Further, in the present embodiment, since the tapered bristles 25 are integrated by the three tapered steel matrix bodies 26, the effect of the high modulus of elasticity can be obtained as in the first embodiment. In this embodiment, the toothpaste can be held between the three tapered portions 26A, and the toothpaste can be supplied to the inner portion of the periodontal pocket as in the case of the tapered bristles 5, It is also possible to suppress the cracks.

&Lt; Fourth Embodiment &

5A is a plan view of a tip end portion of a tapered bristle 35, and FIG. 5B is a perspective view of a tapered bristle 35. FIG. 5A is a plan view of a tapered bristle 35 of a fourth embodiment according to the present invention .

The tapered bristles 35 of the fourth embodiment shown in Figs. 5A to 5B are used for forming the toothbrush by being hung on the head made of hard resin like the tapered bristles of the first to third embodiments.

The structure of the tapered bristles 35 shown in Figs. 5A to 5B is similar to the structure of the tapered bristles 5 of the first embodiment shown in Figs. 1B to 1C, This is an example in which the matrix 36 is provided.

The tapered bristles 35 of this embodiment are formed by integrating the three tapered steel bodies 36 made of resin as shown in an enlarged view in Fig. 5B at the central portion side of the transverse section of the tapered bristles 35, And the entire or a part of the side surface of the integrated portion is covered with a covering portion 37 made of resin.

A tapered portion 36A whose tip is narrowed is formed on the tip side of the tapered steel base 36. [ In the tapered steel matrix body 36, the portion excluding the tapered portion 36A is the base portion 36B. The base portion 36B has an arbitrary cross-sectional shape in the axial direction.

It is to be noted that the term &quot; having the same cross-sectional shape &quot; as used herein is to be substantially the same, for example, even if there is a difference of 0% or more and 15% or less in the cross-

The base portion 36B of the tapered steel base body 36 of the present embodiment is formed so that the base portion 36B of the tapered steel base body 36 is located on the side of the center portion of the tapered bristle 35 on the cross section of the base portion 36B, And the width of the intermediate portion 16c is larger than the width of the outer edge portion 36b.

The width of the inner edge portion 36a, the width of the outer edge portion 36b and the width of the intermediate portion 36c in this embodiment refer to the width of the inner edge portion 6a Quot ;, &quot; width of outer edge portion 6b &quot;, and &quot; width of middle portion 6c &quot;.

In the tapered steel base body 36 of this embodiment, the tapered bristles 36 have three outer side edge portions 36b, as shown in Fig. 5A, in which the tapered steel base body 36 has a center axis of tapered bristles 35 And the tapered bristles 35 are formed by partially covering the side surfaces of these with the covering portions 37. [ The protruding width of the outer side edge portion 36b protruding to the outside of the covering portion 37 is W1 and the protrusion height is H1. 5B shows only one end of the tapered bristle 35, but the other end of the tapered bristle 35 has the same shape as that of FIG. 5B by forming the tapered portion 36A. The tapered bristles 35 are deformed into a V-shaped shape and are laid flat on the head portion of the toothbrush so that the toothbrush 35 .

The bristle diameter a of the tapered steel base body 36 is set such that three tapered steel base bodies 36 in the case of this embodiment are gathered around the central axis of the tapered bristles 35, The outer peripheral portion 36b of the tapered bristle tuft 35 is positioned at the outer periphery of the covering portion 37 which is centered and centered on the tapered bristle 35 in the cross section of the tapered bristle 35 And an auxiliary line connecting the center of the tapered bristle 35 with the center of gravity at the intersection of the imaginary circle and the outer edge of the base portion 36B is formed by the auxiliary line and the base portion 36B The bristle diameter a can be set to about 50 to 150 占 퐉 and the bristle diameter a can be set to 70 占 퐉 It is more preferable to select a range of about 1 to 30 mu m. It is preferable that the length of the tapered portion 36A on the tip side of the tapered steel matrix 36 (i.e., the maximum distance in the longitudinal direction of the tapered portion) is about 0.5 mm to 5.0 mm.

Assuming that the diameter of the imaginary circle 38 connecting the outermost portion of the three tapered steel base bodies 36 and the center of the tapered bristle 35 is the bristle diameter b of the tapered bristle 35, ) Is preferably in the range of about 100 mu m to 300 mu m, more preferably in the range of about 150 mu m to 250 mu m.

The maximum width of the rounded cross section to which the round is imparted is preferably in the range of about 10 mu m to 100 mu m.

In the tapered bristles 35 shown in Figs. 5A and 5B, the tapered portion 36A can easily be inserted into the periodontal pocket because the tapered bristles 5 of the first embodiment are tapered. Therefore, in the present embodiment, the ability to enter the periodontal pocket is excellent, and the brushability in the periodontal pocket is excellent, and the clean feeling is excellent. Further, in this embodiment, since the tapered bristles 35 are integrated by the three tapered steel matrix bodies 36, the effect of the high modulus of elasticity can be obtained as in the first embodiment. In the present embodiment, the toothpaste can be held between the three tapered portions 36A. As in the first embodiment, the effect of supplying the toothpaste to the inside of the periodontal pocket and the effect of separating the tapered bristles There is also an effect that can be suppressed.

&Lt; Embodiment 5 >

6A is a plan view of a tip end portion of a tapered bristle 45, and FIG. 6B is a perspective view of a tapered bristle 45 (FIG. 6A). FIG. 6A is a plan view of the tapered bristle 45 of the fifth embodiment according to the present invention .

The tapered bristles 45 of the fifth embodiment shown in Figs. 6A to 6B are used for forming a toothbrush by being hung on a head made of a hard resin like the tapered bristles of the first to fourth embodiments.

As shown in Figs. 6A and 6B, the tapered bristle tufts 45 of this embodiment are integrally formed adjacent to each other on the center side of the transverse section of the tapered bristles 45, All or a part of the side surface is covered with a covering portion 47 made of resin. The covering portion 47 in this embodiment is a bristle-shaped covering portion.

The &quot; bristle-shaped covering portion &quot; as used herein refers to a portion covered with bristles or the like except for the exposed portion so as to partially expose the taper bristles.

A tapered portion 46A having a shape in which its tip is narrowed is formed at the tip side of the tapered steel base 46. [ In the tapered steel matrix body 46, the portion excluding the tapered portion 46A is the base portion 46B. The base portion 46B has an arbitrary cross-sectional shape in the axial direction.

In addition, the term &quot; the same cross-sectional shape &quot; as used herein is to be substantially the same, and for example, even if there is a difference of 0% or more and 15% or less in the cross- The base portion 46B has a triangular cross section. The term &quot; triangular shape &quot; as used herein means a polygon composed of three points that are not on the same straight line and three line segments connecting the points, and the three points may be triangular vertices and the vertices may have a square .

In the base portion 46B, the lower edge portion of the triangle is defined as the inner edge portion 46a, the inner edge portion 46a is disposed in the direction of the center of the tapered bristle 45 in the transverse section, The outer edge portion 46b is disposed on the vertex side opposite to the lower side in the triangle and the outer edge portion 46b is disposed on the transverse surface of the tapered bristle 45 in the outward direction. The base portion 46B is embedded in the covering portion 47 in a state in which the outer side edge portion 46b protrudes outside the covering portion 47. [

The projecting width of the outer side edge portion 46b projecting to the outside of the covering portion 47 is W3 and the projecting height is H3.

In the example of Fig. 6A, the tapered steel matrix 46 is arranged at an interval of 90 degrees around the inside of the covering portion 47 of a bristle shape having a circular cross section.

The number of tapered steel base bodies 46 for constituting the tapered bristles 45 may be appropriately changed as long as they have the effect of the present invention.

The tapered steel matrix 46 may be appropriately changed as long as it has the effect of the present invention. For example, the tapered steel matrix 46 may be arranged at regular intervals or at unequal intervals.

6B shows only one end of the tapered bristle 45, but the other end of the tapered bristle 45 has the same shape as that of FIG. 6B by forming the tapered portion 46A or the like. Therefore, tapered portions 46A and the like are formed on both ends in the longitudinal direction of the tapered bristle tu 45, and a bundle of tapered bristles 45 is deformed into a V-shape to be flush with the head portion of the toothbrush by a flat line, .

The bristle diameter a of the tapered steel base 46 corresponds to the distance from the base of the base portion 46B in the transverse section triangle to each of the four tapered steel bases 46 in this embodiment, The bristle diameter (a) may be about 50 탆 to about 150 탆, and the bristle diameter (a) is more preferably about 70 탆 to about 130 탆. It is preferable that the length of the tapered portion 46A on the tip side of the tapered steel base 46 (i.e., the maximum distance in the longitudinal direction of the tapered portion) is about 0.5 mm to 5.0 mm.

Assuming that the diameter of the virtual circle 48 connecting the outermost portion of each tapered steel base 46 and the center of the tapered bristle 45 is the bristle diameter b of the tapered bristle 45, Is preferably in the range of about 100 mu m to 300 mu m, more preferably in the range of about 150 mu m to 250 mu m.

The maximum width of the rounded cross section to which the round is imparted is preferably in the range of about 10 mu m to 100 mu m.

In the tapered bristles 45 shown in Figs. 6A and 6B, the tapered portion 46A can be easily inserted into the periodontal pocket because the tapered bristles of the previous embodiment are tapered. Therefore, in the present embodiment, entry into the periodontal pocket is excellent, and brushability in the periodontal pocket is excellent, and the clean feeling is excellent. In this embodiment, since the tapered bristles 45 are integrated by the four tapered steel matrix bodies 46, the effect of the high modulus of elasticity can be obtained as in the first embodiment. In the present embodiment, since the toothpaste can be held between the four tapered portions 46A, the toothpaste can be supplied to the inside of the periodontal pocket as in the first embodiment, and the effect that the tapered bristles It is also effective to suppress the cracking.

&Lt; Sixth Embodiment &

7A is a perspective view of a tip end portion of a tapered bristle 55, and FIG. 7B is a plan view of a tapered bristle 55. FIG. 7A is a perspective view of a tip end portion of the tapered bristle 55 .

The tapered bristles 55 of the sixth embodiment shown in Figs. 7A to 7B are used for forming toothbrushes in the head portion made of hard resin like the tapered bristles of the first to fifth embodiments.

As shown in Figs. 7A and 7B, the tapered bristles 55 of this embodiment are formed such that four tapered steel bases 56 are integrally adjacent to each other on the center side of the cross section of the tapered bristles 55, All or a part of the side surface of the base member 50 is covered with a covering member 57 made of resin. The covering portion 57 in this embodiment is a bristle-shaped covering portion.

The &quot; bristle-shaped covering portion &quot; as used herein refers to a portion covered with bristles or the like except for the exposed portion so as to partially expose the taper bristles.

A tapered portion 56A having a shape in which its tip is narrowed is formed at the tip side of the tapered steel base 56. [ In the tapered steel matrix body 56, the portion excluding the tapered portion 56A is the base portion 56B. The base portion 56B has an arbitrary cross-sectional shape in the axial direction.

In addition, the term &quot; the same cross-sectional shape &quot; as used herein is to be substantially the same, and for example, even if there is a difference of 0% or more and 15% or less in the cross-

The base portion 56B has a circular cross-sectional shape. In the base portion 56B, a portion of the tapered bristle 55 in the transverse section in the circular cross-section in the center portion side is referred to as an inner edge portion 56a, and a portion on the opposite side thereof is referred to as an outer edge portion 56b. The outer side edge portion 56b is embedded in the covering portion 57 in a state where the outer side edge portion 56b protrudes outside the covering portion 57. [ The protruding width of the outer side edge portion 56b projecting to the outside of the covering portion 57 is W4, and the protruding height is H4.

In the example of Fig. 7A, tapered steel matrix bodies 56 are arranged at intervals of 90 degrees around the inside of a bristle-shaped covering portion 57 having a circular cross section.

The number of the tapered steel base bodies 56 for constituting the tapered bristles 55 may be appropriately changed as long as they have the effect of the present invention.

The arrangement of the tapered steel base bodies 56 may be appropriately changed as long as they have the effect of the present invention. For example, the tapered steel base bodies 56 may be arranged at regular intervals or at unequal intervals.

7B, only one end of the tapered bristle 55 is drawn, but the other end of the tapered bristle 55 also has the same shape as that of FIG. 7B by forming the tapered portion 56A. Therefore, the tapered bristles 55 are formed with tapered portions 56A at both ends in the longitudinal direction of the tapered bristles 55, and the bundle of the tapered bristles 55 is deformed into a V-shape, and the bristles are laid flat on the head portion of the toothbrush, do.

The bristle diameter a of the tapered steel base 56 corresponds to the diameter of the base portion 56B in the transverse section circular shape in each of the four tapered steel bases 56 in this embodiment, And the bristle diameter (a) is more preferably selected in the range of about 70 m to 130 m. It is preferable that the length of the tapered portion 56A at the tip side of the tapered steel base 56 (i.e., the maximum distance in the longitudinal direction of the tapered portion) is about 0.5 mm to 5.0 mm.

The diameter of the imaginary circle 58 connecting the outermost portion of the tapered steel matrix aggregate 59 of the four tapered steel matrix bodies 56 and the center of the tapered bristles 55 is defined as the sum of the diameters of the bristles of the tapered bristles 55, The diameter (b) of the bristles is preferably in the range of about 100 m to 300 m, more preferably in the range of about 150 m to 250 m.

The maximum width of the rounded cross section to which the round is given is in the range of about 10 mu m to about 100 mu m.

In the tapered bristles 55 shown in Figs. 7A to 7B, like the tapered bristles of the previous embodiment, the tapered portion 56A can easily be inserted into the periodontal pocket because of tapering. Therefore, in the present embodiment, the ability to enter the periodontal pocket is excellent, and the brushability in the periodontal pocket is excellent, and the clean feeling is excellent. Further, in this embodiment, since the tapered bristles 55 are integrated by the four tapered steel bases 56, the effect of having a high modulus of elasticity can be obtained as in the first embodiment. In the present embodiment, since toothpaste can be held between the four tapered portions 56A, the toothpaste can be supplied to the inner portion of the periodontal pocket as in the first embodiment, and the effect that the tapered bristles There is also an effect that can be suppressed.

Example

&Lt; Example 1 >

1B to 1C. Concretely, four tapered steel matrix bodies of cross-sectional oval shape made of PBT resin are bonded at the center side of the transverse section of the tapered bristles, and the side surfaces of the four tapered steel matrix bodies A tapered bristle having a structure in which a part is covered with a covering layer made of PET resin and a tapered portion is provided at both ends in the longitudinal direction. The tapered bristles were planted on the head of a toothbrush bundle made of polypropylene resin. The bristle diameter (a) of the tapered steel matrix was 100 mu m, and the length of the tapered portion on the tip side of the tapered steel matrix was 2 mm.

The bristle diameter (b) of the tapered bristle 5, which is the diameter of the imaginary circle connecting the outermost portion of the four tapered steel matrix and the center of the tapered bristle, was set to 200 mu m. The width of the inner edge of the tapered steel matrix was 80 mu m, the width W1 of the outer edge portion protruding from the coating layer was 80 mu m, and the height of the protrusion was 30 mu m.

Further, about 50% of the side surface of the tapered steel matrix was covered with the covering body.

Twenty tapered steel base bodies were folded in two so that the number of bristles per one tuft base was 40, and the bristles were piled up in four rows by seven stages using a flat wire to manufacture the toothbrush of Example 1 for testing.

&Lt; Example 2 >

Specifically, four tapered steel bodies each having a quadrilateral cross section made of PBT resin are bonded at the central axis side of the tapered bristles, and a part of the side surfaces of the four tapered steel bodies A tapered bristle having a structure in which a tapered portion is provided at both ends in the longitudinal direction is used. The tapered bristles were planted on a head made of polypropylene resin. The bristle diameter (a) of the tapered steel matrix was 90 m, and the length of the tapered portion at the tip side of the tapered steel matrix was 3 mm.

The bristle diameter (b) of the tapered bristle 5, which is the diameter of the imaginary circle connecting the outermost portion of the four tapered steel matrix and the center of the tapered bristle, was set at 190 mu m. The width of the inner edge portion of the tapered steel matrix is 60 mu m, the width W2 of the outer edge portion protruding from the coating layer is 80 mu m, and the protrusion height H2 is 10 mu m. Further, about 50% of the side surface of the tapered steel matrix was covered with the covering portion.

Twenty tapered steel base bodies were folded in two so that the number of bristles of one tuft base was 40, and the bristles were piled up in four rows by seven stages using a flat line to manufacture the toothbrush of Example 2 for testing.

&Lt; Examples 3 to 6 &

The tapered bristles of Example 3, Example 4, Example 5, and Example 6 were used as tapered bristles having the structures shown in Table 1 below. The shape of the tapered bristles of Examples 1 and 2, the resin type (resin 1) of the tapered steel matrix, the resin type (resin 2) of the coating layer, the bristle diameter (mm), a brim diameter (b) (占 퐉), a taper length (mm), an inner edge width W (占 퐉), an outer edge width W (占 퐉) (%), The number of bristles (pieces), and the arrangement (heat) are also shown in Table 1 below.

&Lt; Comparative Example 1 &

As a tapered bristle of Comparative Example 1, a cylindrical body portion having the same diameter as the imaginary circle connecting the outermost portion of the tapered steel matrix of the cross-section of the front cross-section and the center of the tapered bristles, and a tapered tapered portion I made bristles. As described in Patent Document 1, the tapered bristles are formed by bundling a plurality of filaments, each of which has a three-leaf clover-shaped cross section, and folding the bundle into a predetermined length (about 25 to 35 mm) , And the tip end thereof is immersed in a hydrolysis agent such as a caustic soda aqueous solution.

&Lt; Comparative Example 2 &

As a tapered bristle of Comparative Example 2, a toothbrush using the bristle fibers described in Patent Document 2 was produced. In the inside of a skin layer of 190 탆 in outer diameter made of nylon as shown in Fig. 5 and Fig. 6 of Patent Document 2, fibers of bristle compounded with a composite resin composed of three polyester core layers having a diameter of 60 탆 were radiated . The both ends of the bristle fiber were each tapered so that the length of the tapered portion was 3 mm, and bristles having six tapered bristles at the tip as shown in Fig. 1 of Patent Document 2 were obtained. These bristles were used in the same number as in the previous embodiment, and the bristles were flossed to constitute the toothbrush of Comparative Example 2.

&Lt; Comparative Example 3 &

1 embodiment, but equivalent structures, 10㎛ the width (W2) an outer edge portion protruding from the coating layer, to create a tapered bristles of the projection height (H ₂₎ in 1㎛ shape, by flocking the head parts Comparative Example 3 Of toothbrushes.

&Lt; Comparative Example 4 &

1 embodiment, but equivalent structures, 130㎛ the width (W2) an outer edge portion protruding from the coating layer, to create a tapered bristles of the projection height (H ₂₎ in 80㎛ shape, by flocking the head of Comparative Example 4 Of toothbrushes.

The toothbrushes described above are summarized in the following Table 2 as the condition of the cleft palate, the sense of cleansing the tooth surface, the sense of clearing the gap, the perception of the appearance, the feeling of contact, and the overall evaluation.

The evaluation items and evaluation criteria shown in Table 2 are as follows.

&Lt;

The bundles of the bristles were folded into two, the flat portions were laid on the return portions, and the hair bundles were inserted into the bristle holes formed in the head portion. The cracking rate of bristles at that time was measured, and productivity was evaluated based on the following criteria.

A: Cracking does not occur (cracking occurrence rate is less than 10 ppm)

B: Cracking hardly occurs (cracking occurrence rate of 10 ppm or more and less than 50 ppm)

C: Cracking occurs slightly (cracking occurrence rate of 50 ppm or more and less than 100 ppm)

D: Cracking occurs (cracking rate of 100 ppm or more)

<Tooth cleaning>

Ten monitors cleaned the oral cavity with the toothbrush of each example, and the cleaning effect of the tooth surface at that time was evaluated as an evaluation standard. A "," A "," B "," C ", and" D ", respectively.

«Evaluation Criteria»

5 points: I feel the texture of the dentifrice.

4 points: I feel strongly that the dentine is dirty.

3 points: I feel the texture of dentine contamination.

Two points: I do not feel much of the texture of dentine dirt.

1 point: I do not feel the texture of dentifrice.

<Clear sense of gap cleaning>

Ten monitors were used to clean the oral cavity with the toothbrush of each example, and the cleaning effect of the gap at that time was evaluated as an evaluation standard. A "," A "," B "," C ", and" D ", respectively.

«Evaluation Criteria»

5 points: I feel the texture of the gap is very dirty.

4 points: I feel the texture of the gap is dirty.

3 points: I feel the feeling of falling contamination of gap.

2 points: I do not feel much of the feeling that the contamination of the gap falls.

1 point: I do not feel the feeling of falling pollution of gap.

<Appearance recognition>

Ten monitors were observed with naked eyes of each toothbrush, and the discrimination of the shape of the tip of the toothbrush at that time was evaluated as an evaluation standard. A "," A "," B "," C ", and" D ", respectively.

«Evaluation Criteria»

5 points: I feel the shape of the pointed end very much.

4 points: We feel strongly the shape where the tip ends are branched.

3 points: Feel the shape that the tip ends are branched.

2 points: I do not feel much of the shape in which the tip ends are branched.

1 point: I do not feel the shape that the tip is branched.

<Touch feeling>

Ten monitors were used to clean the oral cavity with the toothbrush of each example, and the feeling of contact with the gums at that time was evaluated as an evaluation standard. A "," A "," B "," C ", and" D ", respectively.

[Evaluation standard]

5 points: There is no pain in the gums, and the feeling of contact is very good.

4 points: There is no pain in the gums, and the contact feeling is very good.

3 points: No gum pain, good contact feeling.

2 points: I feel weak pain in my gums.

1 point: I feel a strong pain in my gums.

<Overall evaluation>

The comprehensive evaluation determined from each evaluation is as follows.

A: Two or more A's and the other B's

B: A is less than 1 and the other is B

C: No D, and one is C

D: Which one is D

As apparent from the results shown in Table 2, the tapered bristles of the structure having a plurality of tapered portions at the distal end side of the cylindrical columnar body, the structure of the present invention is superior to the tapered bristles, , It can be seen that the gap cleaning force is also good.

This is because the outer edge portion of the tapered steel matrix protrudes on the outer side of the covering portion, thereby improving the cleaning power of the tooth surface and the clearance cleaning force. The protruding width W of the outer edge portion protruding from the coating layer is preferably in the range of 20 to 120 占 퐉, and the protruding height H is preferably in the range of 10 to 70 占 퐉.

The protruding width W of the outer edge portion protruding from the covering layer is preferably in the range of 10% to 30% of the bristle diameter b and the outer edge portion 6b protruding outward from the covering portion 7 It is considered that the protrusion height H1 is preferably in the range of 5% to 40% of the bristle diameter (b).

(Industrial availability)

According to the present invention, there is provided a tapered bristle having a soft contact with a gum and excellent entry into a periodontal pocket, excellent tactile sensation, bristles being hard to be broken at the time of use or during use, It is possible to provide a toothbrush with bristles, which is very useful in industry.

A: Toothbrush 1:
2: head part 5: tapered bristle
6: tapered steel matrix 6A: tapered portion
6a: Inner edge portion 6B:
6b: outer edge portion 7:
9: Taper steel matrix assembly part 15, 25, 35, 45, 55: Tapered bristles
16, 26, 36, 46, 56: Tapered steel matrix
16A, 26A, 36A, 46A, 56A:
16a, 26a, 27a, 37a, 47a, 57a:
16B, 26B, 36B, 46B, and 56B:
16b, 26b, 36b, 46b, 56b:
17, 27, 37, 47, 57:

Claims (8)

A tapered steel matrix aggregation part for arranging three or more to ten or less resin tapered steel matrix bodies adjacent to each other having tapered portions at respective tip ends thereof,
And a resin-made covering portion covering all or a part of a side surface of the tapered steel base so that the side surfaces of the tapered steel base are joined and integrated,
Wherein the covering portion covers all or a part of a side surface excluding the tapered portion of the tapered steel base body and joins the side surfaces with each other,
Wherein an outer edge portion of the tapered steel matrix body excluding the tapered portion protrudes outside the cover portion. The method according to claim 1,
Wherein the tapered steel base body and the covering portion are made of different resins,
Wherein the tapered portion of the tapered steel base body is a tapered portion formed by dipping in a dissolution liquid,
Wherein the solubility of the resin constituting the covering portion to the dissolving liquid is higher than the solubility of the resin constituting the tapered steel matrix to the dissolving liquid. 3. The method according to claim 1 or 2,
Wherein the tapered steel matrix aggregation part is constituted by closely adhering the side surfaces of the respective tapered steel matrix bodies on the center side of the transverse section thereof,
Wherein the covering portion covers a side surface of the tightly integrated portion of each tapered steel matrix. 3. The method according to claim 1 or 2,
Wherein the covering portion is a bristle-shaped covering portion covering each of the adjacently arranged taper steel main bodies,
The outer edge portion of the tapered steel base excluding the tapered portion protrudes to the outside of the covering portion,
Wherein a portion of the tapered steel base excluding the tapered portion of the tapered steel base excluding the outer edge portion is embedded in the bristle-shaped covering portion. 5. The method according to any one of claims 1 to 4,
The projecting width of the outer edge of the tapered steel matrix projecting outward from the covering portion is 5 to 50% of the diameter of the tapered steel matrix and the projecting height is 10 to 80% of the diameter of the tapered steel matrix. Taper bristle. 6. The method according to any one of claims 1 to 5,
Wherein the tapered steel matrix aggregate portion is formed such that three to ten or less than ten tapered steel matrix aggregates around the center axis of the tapered bristles in a cross-sectional polygonal shape or a cross-sectional oval shape, Tapered bristles. A toothbrush according to any one of claims 1 to 6, wherein the tapered bristles are worn on the head part. A tapered steel matrix aggregation part for arranging three or more to ten or less resin tapered steel matrix bodies adjacent to each other having tapered portions at respective tip ends thereof,
And a resin-made covering portion covering all or a part of a side surface of the tapered steel base so that the side surfaces of the tapered steel base are joined and integrated,
Wherein the covering portion covers all or a part of the side surface excluding the tapered portion of the tapered steel base body and joins the side surfaces with each other,
The outer edge portion of the tapered steel matrix excluding the tapered portion of the tapered steel matrix protrudes to the outside of the covering portion,
In the above manufacturing method,
Forming a bristle covering body by covering the bristle material with three or more but not more than 10 bristle materials adjacent thereto with a resin covering member;
Forming a tapered portion at the tip of each bristle material by immersing the tip side of the bristle cover body in the solution and then raising it; And
And melting the coating member around the tapered portion to form a covering portion covering the side surface portion excluding the tapered portion of the bristle material having the tapered portion,
Wherein the resin constituting the bristle material and the resin constituting the covering member are resins having solubility in the solution,
Wherein the solubility of the resin constituting the covering member to the dissolving liquid is higher than the solubility of the resin constituting the bristle material to the dissolving liquid.

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