KR101356263B1 - Toothbrush - Google Patents

Abstract

TECHNICAL FIELD This invention relates to the toothbrush which could prevent peeling of the buffer part for preventing hair. According to the present invention, the head portion 2 into which the hair is implanted is a curved surface 7 between the hair cutting surface 5 for planting hair hair and the side surface 6 adjacent thereto. As the toothbrush 1, which is formed as a flocking hole 4 of the flocking hole 4, and the periphery 42 of the flocking hole 4 is formed of a resin having a hardness lower than that of the base 20. And the shock absorbing portion 30 is joined to the base 20 in the region of the curved surface 7, wherein the joining surface 22 of the shock absorbing portion 30 and the base 20 is the above formula. It is the inclined surface which inclines toward the outer side of the said head part 2, based on the mother surface 5. As shown in FIG.

Description

Toothbrush {TOOTHBRUSH}

The present invention relates to a toothbrush.

This application claims priority based on Japanese Patent Application No. 2009-242457 and Japanese Patent Application No. 2009-242458 for which it applied to Japan on October 21, 2009, and uses the content here.

Filaments made of polyester-based resins such as polytrimethylene terephthalate (PTT) are inexpensive compared to nylon and are widely used as bristles of toothbrushes because of their excellent workability by chemical treatment. Moreover, since polyester resin is excellent in extension | restoration recovery property compared with nylon, when it is used as the bristles of a toothbrush, there exists an advantage that a hair | bristle bundle does not open easily.

Usually, in the toothbrush, although the bristles are implanted in a base made of a relatively hard material such as polypropylene resin (PP) and polyethylene terephthalate resin (PET), the filament of polyester resin is used for the bristles. In other words, while the durability against hair flaring is good, there is a problem of bending or cutting (hair) at the root.

This hair stem is caused by the fact that the base of the hair hair repeatedly touches the periphery of the hair follicle hole at the time of the hair loss, causing breakage of the hair hair. In addition, this hair cutting has a side surface which is caused by breaking of the hair when the base of the hair hair repeatedly touches the periphery of the tuft hole because the hair is made of a hard material.

To address this problem, a toothbrush is proposed in which a elastomer resin having a specific hardness is coated on a base and the periphery of the tuft hole is formed of an elastomer resin (for example, Patent Document 1). This toothbrush is comprised of the elastomer resin whose hardness is lower than expectations, and suppression of a hair is aimed at by dispersing or relaxation | straining the stress to the base of the bristles at the time of a braking.

Further, for example, a toothbrush in which chamfers have been applied to the periphery of the seedling hole has been proposed (for example, Patent Document 2). This toothbrush is designed to suppress hair growth by alleviating the stress on the base of the hair bristles at the time of desorption.

Patent Document 1: Japanese Patent Application Laid-Open No. 2007-6937 Patent Document 2: Japanese Patent Application Laid-Open No. 2007-6938

By the way, relatively hard materials, such as a polypropylene resin (PP) and a polyethylene terephthalate resin (PET), are used for the toothbrush base. As in Patent Literature 1, when the peripheral portion (buffered portion) of the tuft hole formed of the elastomer resin is provided, the adhesion state between the buffer portion and the base is influenced by the adhesiveness of the resins with each other. For this reason, although an elastomer resin is selected according to the material of a base material, there exists a possibility that a buffer part may peel, for example, when the boundary of a buffer part and a base contacts a tooth at the time of shaping | molding.

In response to this problem, there is a countermeasure of increasing the adhesive area between the buffer part and the base by increasing the area of the buffer part, thereby improving the adhesive strength. However, the elastomer resin is expensive and unfavorable in terms of economy. In addition, when a buffer part exists in the side of a base etc., there exists a possibility that a buffer part may fall out by the contact with the tooth at the time of a removal.

On the other hand, in order to prevent hair from being cut off by the periphery (buffered part) of the hair follicle made of elastomer resin as in Patent Document 1, the buffer part needs a sufficient thickness for obtaining the hair cutting prevention effect. On the other hand, if the shock absorbing portion is made too thick for the prevention of cutting, the head portion itself becomes thick and the usability decreases. When the base is made thin in order to maintain usability, the seedling hole at the base becomes shallow, and sufficient seedling strength cannot be obtained.

In addition, as in Patent Document 2, when chamfering is performed at the periphery of the seedling hole, there is a problem that a skirt portion remains at the portion where chamfering is performed.

Then, the 1st objective of this invention is providing the toothbrush which can prevent peeling of a buffer part, suppressing the usage-amount of the elastomer resin for preventing hair.

The 2nd object of this invention is to provide the toothbrush which can prevent the hair-cutting of the bristles, maintaining usability and hair-plant strength.

According to a first aspect of the toothbrush of the present invention, the head portion on which the hair is implanted is a curved surface between the hair transplantation surface to which the hair growth is implanted and the side surface adjacent thereto, and a plurality of hair growth holes are formed in the hair growth surface. A toothbrush in which the periphery of the tuft hole is a buffer part formed of a resin having a lower hardness than the material of the base, wherein the buffer part is joined to the base in the curved area, wherein the joining surface of the buffer part and the base is It is characterized in that the inclined surface which is inclined toward the outside of the head portion when based on the planting surface.

In the 1st aspect of the toothbrush of this invention, it is preferable that the said joining surface is an inclined surface of 100-150 degrees with respect to the said seedling surface, A convex part is formed in either the said base and the said buffer part in the said joining surface. It is more preferable that a concave portion fitted to the convex portion is formed on the other side, and that the buffer portion preferably has a thickness of the base phase of 0.1 to 1.0 mm, and the outer periphery of the side of the head portion and the buffer portion. It is preferable that the distance in the seedling surface direction between and is 0.1-0.9 mm.

According to a second aspect of the toothbrush of the present invention, the head portion in which the hair is implanted is formed with a plurality of hair follicles formed on the woolen surface, and the periphery of the hair follicles is formed of a resin having a lower hardness than the expected material. A denier toothbrush is formed in the periphery of the opening side of the tuft hole in the base, an inclined surface that gradually decreases in diameter toward the inner part of the tuft hole, and further includes an inclined surface. Characterized in that the buffer portion is formed in.

In the 2nd aspect of the toothbrush of this invention, it is preferable that the said inclined surface is C surface, It is preferable that the said C surface is C 0.1-0.8 mm, The said buffer part is 0.1-1.0 mm in thickness of the said base phase. It is preferable that it is preferable, The hair | bristle bundle which bundled several hair | bristle hair may be folded and implanted twice using the flat plate-shaped flat line on the said woolen surface.

As one aspect of the present invention, since the buffer part is joined to the base in the curved area, the boundary part is hard to contact teeth or the like during the shaping and peeling hardly occurs. In addition, since the joint surface between the buffer portion and the base is inclined with respect to the seedling surface, burr generation in the vicinity of the boundary portion at the time of molding can be prevented. For this reason, peeling of the buffer part resulting from burr can be prevented, suppressing the usage-amount of the elastomer resin which comprises a buffer part.

As another aspect of the present invention, since the bonding surface is 100 to 150 ° with respect to the seedling surface, it is possible to prevent burr generation during molding.

In another aspect of the present invention, since the convex portion is formed on either the base and the buffer portion, and the concave portion is formed on the other side to fit the convex portion, further improvement of the adhesiveness between the buffer portion and the base can be achieved. Can be.

As another aspect of the present invention, since the buffer portion has a thickness of 0.1 to 1.0 mm, further improvement in adhesiveness between the buffer portion and the base can be achieved without impairing the usability of the toothbrush.

In another aspect of the present invention, since the distance from the side of the head to the outer periphery of the shock absorbing portion is 0.1 to 0.9 mm, further improving the adhesiveness between the shock absorbing portion and the base without impairing the usability of the toothbrush and the hair growth strength. Can be planned.

According to another aspect of the invention, the periphery of the tuft hole is a buffer part formed of resin having a lower hardness than the material of the base, and the periphery of the opening side of the tuft hole in the base is directed toward the inner part of the tuft hole. Since the inclined surface which narrows gradually is formed according to this, the stress which concentrates on the base of an agglomeration can be alleviated, and a head can be prevented. In addition, the strength of the base can be secured, and the usability and sufficient planting strength can be maintained.

As another aspect of the present invention, since the inclined surface is the C surface, the stress at the base of the agglomerated hair can be alleviated and the hair can be prevented.

As another aspect of the present invention, since the C surface is C 0.1 to 0.8 mm, further improvement in the effect of preventing cuts and planting strength can be achieved.

As still another aspect of the present invention, since the buffer portion has a thickness of the expected phase of 0.1 to 1.0 mm, further improvement in the effect of preventing hair loss can be achieved.

As still another aspect of the present invention, even when a hair bundle which bundles a plurality of chain hairs is planted using a flat line, the hair strength can be ensured.

1 is a plan view of a toothbrush according to an embodiment of the present invention;
2 is a cross-sectional view of a toothbrush according to one embodiment of the present invention.
3 is a sectional view of a toothbrush according to one embodiment of the present invention.
4 is a cross-sectional view of a toothbrush according to an embodiment of the present invention;
5 is a plan view of a toothbrush according to one embodiment of the present invention.
6 is a cross-sectional view of a toothbrush according to one embodiment of the present invention.
Fig. 7 is a partial cross-sectional view of the toothbrush illustrating the hair transplantation holes in the state where the hair is implanted.

EMBODIMENT OF THE INVENTION The 1st aspect of the toothbrush of this invention is demonstrated using drawing below. FIG. 1 is a view for explaining the toothbrush 1 of the present invention, which is a plan view showing a head portion provided at the tip of a handle portion (not shown) of the toothbrush 1, and FIG. 2 is II-II of FIG. It is a cross section. Incidentally, for convenience of explanation, the illustration of the hair-stitch is omitted, and only the hair-stitching hole in which the hair-stitch is planted is shown.

As shown in FIGS. 1 and 2, the toothbrush 1 includes a hair transplantation surface 5 for planting hair-stuck hairs, and a head portion 2 having a curved surface 7 between the side surfaces 6 adjacent thereto. The radius of curvature R of the curved surface 7 is about 0.5 to 0.7 mm.

The head portion 2 includes a base 20 having a plurality of bottomed cylindrical hatching holes 4 formed thereon, and a buffer portion 30 covering the surface 21 on which the seedling holes 4 of the base 20 are formed. It consists of As a result, the hole peripheral portion 42 of the tuft hole 4 is constituted by the buffer portion 30. The hair-drilling hole 4 is about 3.0-5.0 mm in depth D from the hair-planting surface 5, and the hole diameter d is about 1.5-3.0 mm.

The buffer part 30 is joined to the base 20 at the boundary part 32 of the area | region of the curved surface 7, and the joining surface 22 of the base 20 and the buffer part 30 is a seeding surface 5 On the basis of this, the inclined surface is inclined toward the outer direction of the head (2). As a result, the shock absorbing portion 30 is provided so that the boundary portion 32 is located inside the contour of the head portion 2 when viewed from the plane. Although the inclination angle of the bonding surface 22 is not specifically limited, The angle (theta) formed by the inclined surface P of the bonding surface 22 and the imaginary surface Q parallel to the planting surface 5 is preferable. Preferably it is 100-150 degrees, More preferably, it is 115-135 degrees.

The material of the base 20 can be determined in consideration of the stiffness and mechanical properties required for the toothbrush 1, and for example, uses a high hardness resin having a bending modulus (JIS K7203) in the range of 500 to 3000 MPa. By this, the mechanical characteristics required for the toothbrush 1 can be obtained. As such a high hardness resin, PP, PET, polystyrene resin (PS), acrylonitrile butadiene styrene resin (ABS), cellulose propionate resin (CP), polyarylate resin, polycarbonate resin, acryl, for example Ronitrile styrene resin (AS) etc. are mentioned, These can be used 1 type or multiple types.

In the case of projection, the edge distance l between the contour of the head portion 2 formed by the outermost periphery of the base 20 and the boundary portion 32, that is, the side surface 6 from the shock absorbing portion 30. The distance in the planting surface direction to the outer circumferential edge of is preferably 0.1 to 0.9 mm, more preferably 0.2 to 0.5 mm. If it is less than 0.1 mm, shaping | molding of the base 20 will be impaired, and if it exceeds 0.9 mm, the head part 2 will become large and the operability of the toothbrush 1 will worsen.

The buffer part 30 is formed with resin (low hardness resin) whose hardness measured by "JIS K6253, hardness test, and test conditions JIS A" is lower than the base 20, For example, hardness measured by JIS K6253 Preferably, it is 5-100, More preferably, it is 15-90.

As this low hardness resin, for example, polyolefin-based thermoplastic elastomer, polystyrene-based thermoplastic elastomer, polyurethane-based thermoplastic elastomer, polyester-based thermoplastic elastomer, 1,2-polybutadiene-based thermoplastic elastomer , Thermoplastic elastomers such as ethylene-vinyl acetate-based thermoplastic elastomer, polyvinyl chloride-based thermoplastic elastomer, natural rubber-based thermoplastic elastomer, and fluorine-based thermoplastic elastomer, trans-polyisoprene-based thermoplastic elastomer ( TPEE).

The thickness t on the surface 21 of the base 20 of the shock absorbing portion 30 can be determined in consideration of the depth D of the tuft hole 4, the hole diameter d, the material of hair loss, and the like. For example, 0.1-1.0 mm is preferable, 0.2-0.8 mm is more preferable, 0.3-0.7 mm is still more preferable. When 0.1 mm or more, the adhesiveness between the buffer part 30 and the base 20 can be improved, the stress at the base of the agglomeration can be alleviated at the time of shaping | molding, and a hair can be suppressed, and 1.0 mm or less The hair-stitching strength of the hair-stuck planted by the cotton and tuft hole 4 can be maintained.

The material of the bristles is not specifically limited, The well-known material used for a toothbrush can be used. Examples of the material of the bristles include, for example, polyester-based resins mainly composed of polyester or polyester, nylon-based nylons or nylon-based resins mainly composed of nylon, polyolefins such as polypropylene and polyethylene, or polyolefins. Olefin resin etc. which have a main component as a main component are mentioned, Polyester resin is especially preferable. This is because polyester-based resins are more likely to generate a hair at the base than other materials, so that the effect of providing the buffer portion 30 is remarkable. As polyester resin, PET, polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), etc. are mentioned, Especially, PTT is more preferable. Since PTT tends to generate | occur | produce among polyester resin, the effect which provided the buffer part 30 is remarkable.

Although the thickness of the hair-stuck is not specifically limited, For example, it is the range of 6-11 mils (that is, 0.152-0.279 mm; where 1 mil = 1/1000 inch). In addition, although the cross-sectional shape of the bristles is mainly circular, it is not specifically limited to the thing of such a shape. For example, a chain may have a cross-sectional shape such as a triangle, a square, a hexagon, or a petal, or a combination thereof may be used. In addition, what was previously processed into the shape of whole bristles, for example, wave shape, twist shape, sawtooth shape, etc. may be used, and what combined these may be used.

As the bristles, those having substantially the same outer diameter except for the rounded portion of the bus bar may be used, or a tapered shape having a tapered outer diameter gradually toward the bus bar may be used. In addition, the tip shape of the bristles may be, for example, a spatula shape, a thin end and a wide shape, or a spherical shape.

In general, although the hair | bristles are implanted in the tuft hole 4 using the hair | bristle bundle which consists of several pieces as one unit, the length of each hair | bristle bundle may be ordered and it may not be ordered. In addition to the flat shape, the hairline outline shape (hair shape) of the hair | bristle bundle can also be made into a dome shape, a valley shape, an uneven | corrugated step shape, etc.

Next, the manufacturing method of the toothbrush 1 of this invention is demonstrated. This manufacturing method forms the base 20 (primary molding), provides the buffer part 30 in the obtained base 20 (secondary molding), and the head part 2 and the handle part (not shown). A shaping | molding process of obtaining the bristles handle provided with the, and the bristles process of planting a bristles in the head part 2 of the said bristles handle are provided.

Primary molding injects the resin (also called primary resin) which comprises the base 20 into the said cavity using a pair of primary metal mold | die which forms the cavity corresponding to the base 20, and the base ( 20) molding operation.

Subsequent secondary molding uses a pair of secondary molds with cavities corresponding to the bristles handles, loads the base 20 obtained in the primary molding into the cavity of the secondary mold, and buffers the secondary molds ( It is an operation of injecting the resin (also referred to as the secondary resin) constituting the 30 and providing the shock absorbing portion 30 to the base 20. When the base 20 is loaded in the cavity, the cavity of the secondary mold has a space formed between the loaded base 20 and the cavity corresponding to the buffer part 30.

The secondary mold includes a first split mold on the side of forming the seedling surface 5, and a second split mold on which the bottom surface 8 side of the head part 2 is fixed. The splitting die and the second splitting die are fitted with a dashed-dotted line O as a PL (Parting Line). In addition, PL is located substantially in the middle between the seedling surface 5 and the bottom surface 8, and is substantially parallel to the seedling surface 5.

The hair-growing process is a process of implanting the hair-stuck in the head part 2 of the hair-stitching handle obtained by secondary shaping | molding, and using it as the toothbrush 1. A well-known hair removal method can be used for the hair transplantation, For example, the hair | bristle bundle which consists of a plurality of hair bristles is folded in two, a fall prevention member (flat) is interposed between them, and this flat line is inserted into the hair-frilling hole 4, for example. And a flat hair transplanting method for fixing the hair bundle by type. A conventionally well-known thing can be used for this flat line, For example, a flat thing made from brass or aluminum is mentioned.

The dimension and shape of the flat line can be determined in consideration of the hole diameter and the like of the tuft hole 4. In addition, the length of the flat line type which is provided in the tuft hole 4 is not specifically limited, It is preferable to set it as the length which can support a hair | bristle bundle and does not produce the crack and whitening of the hair-stuck handle at the time of tuft, For example, it is preferable to make 0.3-0.5 mm longer than the long axis length of the hair-line hole 4 in the flat line type direction. In addition, although a flat type angle can be selected freely, it is preferable to set it as the range of 5-80 degrees with respect to the longitudinal direction of a bristles handle, in order to avoid generation | occurrence | production of a crack and whitening, More preferably, it is 15-30 degrees. In addition, the flat type angle does not need to be the same in all the tuft holes 4, and may be a different type angle for every tuft hole 4, respectively.

As described above, in one aspect of the present invention, since the hole periphery 42 of the tuft hole 4 is constituted by the shock absorbing portion 30, the stress on the base of the agglomeration at the time of desorption is relieved. Therefore, it is possible to suppress the occurrence of hair. In addition, the degree of freedom of movement of the hair hair at the time of shattering increases, the hair hair easily enters into a gap such as the interdental, and the cleaning power is improved. In addition, since the freedom of movement of the hair hair increases, the hair hair moves luxuriantly, so that the length of the hair hair can be shortened and the operability of the toothbrush 1 can be improved.

As another aspect of the present invention, since the boundary portion 32 between the base 20 and the shock absorbing portion 30 is located in the region of the curved surface 7, the boundary portion 32 becomes difficult to contact the teeth or the like at the time of extinction. Prevention of peeling or omission of the buffer part 30 can be aimed at.

As another aspect of the present invention, since the joining surface 22 between the base 20 and the shock absorbing portion 30 is an inclined surface facing the outside of the head portion 2, the boundary portion 32 is formed at the time of shaping the bristles handle. Burr generation can be prevented, and peeling of the base 20 and the buffer part 30 resulting from burr can be prevented.

In secondary shaping, when the inclination angle θ of the joining surface 22 is 90 ° as in the prior art (Patent Document 1 and the like), the base 20 is pressed by the first split mold, and the joining surface 22 is It is inclined in the direction of the tuft hole 4. When the joining surface 22 is inclined in the direction of the tuft hole 4, a gap is formed between the first splitting die and the curved surface 7. In this state, when the secondary resin is injected, the secondary resin flows into the gap between the curved surface 7 and the first split mold, which tends to be burred.

In the toothbrush 1 which is one aspect of this invention, since the joining surface 22 is an inclined surface which faces the outer side of the head part 2, even if the base 20 is pressed by the 1st split type, the joining surface 22 will be made. It is not easy to incline toward the hair transplantation hole 4 side, and the clearance gap is prevented between the curved surface 7 and a 1st split mold. As a result, burr hardly occurs in the vicinity of the boundary part 32, and peeling, a missing, etc. of the buffer part 30 resulting from burr at the time of a shaping | molding are prevented. In addition, since a space (euro) in which the secondary resin is filled is secured, prevention of insufficient filling (short shot) of the secondary resin can be achieved.

This invention is not limited to embodiment mentioned above.

For example, the convex part may be formed in either the base and the buffer part at the joining surface, and the concave part may be formed on the other side of the convex part.

For example, like the head part 102 shown in FIG. 3, the joining surface 122 of the base 120 and the buffer part 130 is the convex part 124 formed in the base 120, and the buffer part. The recessed part 132 formed in 130 may be fitted.

For example, like the head part 202 shown in FIG. 4, the joining surface 222 of the base 220 and the buffer part 230 is the recessed part 224 formed in the base 220, The convex part 232 formed in the buffer part 230 may be fitted.

In addition, the convex portions 124 and 232 may be formed of a plurality of protrusions such as cones, pyramidal shapes, columnar shapes, and prismatic shapes, or may be ribs formed in a band shape according to the joining surface. .

In the above-mentioned embodiment, although the tuft hole is a cylindrical shape with a bottom, the shape of a tuft hole is not specifically limited, For example, the cross section may be an ellipse, a polygon, etc. may be sufficient as it.

In the above-mentioned embodiment, although the hair | bristle bundle is planted by the flat hair-forming method, the hair-growing method is not limited to this, For example, the thermal fusion method which press-fits and fixed the lower end of a hair | bristle bundle in the molten resin used as a hair-fed part, the lower end of a hair | bristle bundle After heating to form a molten ingot, you may use the in-mold method etc. which inject | pour molten resin into a metal mold | die, and shape a hair transplant part.

Then, the 2nd aspect of the toothbrush of this invention is demonstrated using drawing below. Fig. 5 is a view for explaining the toothbrush 301 of the present invention, which is a plan view showing a head portion provided at the tip of a handle portion (not shown) of the toothbrush 301, and Fig. 6 is a II-II of Fig. 5. It is a cross section. Incidentally, for convenience of explanation, the illustration of the hair-stitch is omitted, and only the hair follicle in which the hair-stitch is planted is shown.

As shown in FIGS. 5 and 6, the toothbrush 301 has a plurality of planting holes 304 formed on the planting surface 305, and is formed by the buffer portion 330 provided on the base 320. The head peripheral part 342 of 304 is provided with the head part 302 comprised. The head portion 302 is the curved surface 307 between the seedling surface 305 and the side surface 306 facing the bottom surface 308 adjacent thereto, and the radius of curvature R of the curved surface 307 is 0.5 to It is about 0.7 mm. Although the size of the head part 302 is not specifically limited, The width W is about 7.0-12.0 mm, and the thickness T is about 3.0-6.0 mm.

On the side of the hair transplantation surface 305 of the head part 302, the bottomed cylindrical tuft hole 304 is formed in multiple numbers, The depth of the tuft hole 304 from the transplantation surface 305 is 2.0-5.0 It is about mm, and the hole diameter d is about 1.0-3.0 mm. In addition, the depth D2 of the tuft hole 304 in the base 320 is about 1.5-4.5 mm, for example. This is because, when the depth D2 is within the above range, a release prevention tool (flat line) to be described later can be firmly fixed.

As shown in FIG. 7, the hair | bristle bundle 312 which consists of the several hair | bristle hairs 310 is fixed to the tuft hole 304 by the flat line 314 folded in two and sandwiched between them. Here, reference numeral 313 denotes a base which is a portion inserted into the hair transplant hole 304 in the hair bundle 312.

The base of the base hole 321, which is the periphery of the seedling hole 304 in the base 320, has an inclined surface whose diameter gradually narrows toward the inner part direction of the seedling hole 304, that is, toward the hole bottom portion 344 ( 322 is formed. In this embodiment, the inclined surface 322 is a C surface, and this C surface is preferably C 0.1 to 0.8 mm, more preferably C 0.1 to 0.5 mm, still more preferably C 0.2 to 0.4 mm. If the thickness is less than 0.1 mm, the effect of preventing cuts may be insufficient. If the thickness is more than 0.8 mm, the spacing between adjacent tuft holes 304 may be increased to increase the head portion 302, resulting in decreased usability.

In the present specification, the C surface means a surface which is formed by chamfering the corner portions at two angles orthogonal to each other at an angle of 45 ° from each surface. It shows that the chamfered at the angle of 45 degrees in the position of the length of the numerical value (usually expressed in units of mm) from the intersection of two surfaces. For example, when displaying C 0.5 mm, it shows that the corner part is chamfered at the angle of 45 degrees at the position of 0.5 mm from the edge part (intersecting line) of the two surfaces orthogonal to each other.

Moreover, the boundary part 332 which is the outer periphery of the buffer part 330 is an area | region of the curved surface 307. As shown in FIG. Thereby, the boundary part 332 becomes inward of the seedling plane 305 direction rather than the outline of the head part 302 which the outermost peripheral part of the base 320 forms.

The material of the base 320 can be determined in consideration of the stiffness, mechanical properties, etc. required for the toothbrush 301, and specifically, a high hardness resin such as the high hardness resin exemplified as the material of the base 20 is mentioned. Can be.

The buffer part 330 is formed in the area | region containing the inclined surface 322, and comprises the hole periphery part 342 which is a periphery part of the tuft hole 304, The inner peripheral surface 334 of the buffer part 330, The inner peripheral surface 324 of the tuft hole 304 in the base 320 is approximately the same surface (1).

The thickness t on the base 320 of the shock absorbing portion 330 can be determined in consideration of the depth D of the tuft hole 304, the hole diameter d, the material of the hair 310, and the like. For example, 0.1-1.0 mm is preferable, 0.3-0.8 mm is more preferable, 0.4-0.7 mm is still more preferable, 0.5-0.6 mm is especially preferable. If it is 0.1 mm or more, the adhesiveness between the buffer part 330 and the base 320 can be improved, the stress to the base 313 can be relieved at the time of a braking, and a hair can be suppressed, and 1.0 mm or less While the usability of the cotton and toothbrush 301 is secured, it is possible to maintain the hair growth strength of the hair-studded hair 310 implanted in the hair growth hole 304. In addition, if it is in the said range, the filling shortage (short shot) of resin which comprises the buffer part 330 at the time of shaping | molding can be prevented.

The material and hardness of the shock absorbing portion 330 are the same as those of the shock absorbing portion 30, and examples of the low hardness resin used in the shock absorbing portion 330 also include the low hardness resins used in the shock absorbing portion 30. Same as the example.

The material, thickness, shape, length, and aspect of the hair bristles 310 are the same as those of the hair bristles of the toothbrush 1, and the specific examples thereof are also the same.

The material, the dimension, and the shape of the flat line 314 are the same as those of the said flat line 14, and the specific example is also the same. In addition, as a preferable example of the type angle of the said flat line 314, the example similar to the preferable type angle of the said flat line 14 is mentioned.

Next, the manufacturing method of the toothbrush 301 of this invention is demonstrated. In this manufacturing method, the base 320 is molded (primary molding), the buffer 330 is provided on the obtained base 320 (secondary molding), and the head portion 302 and the handle portion (not shown). And a shaping step of implanting the bristles 310 in the head portion 302 of the bristles handle.

Primary molding injects the resin (also called primary resin) which comprises the base 320 into the said cavity using a pair of primary metal mold | die which forms the cavity corresponding to the base 320, and the base ( 320) molding operation.

Subsequent secondary molding uses a pair of secondary molds with cavities corresponding to the bristles handles, loads the base 320 obtained in the primary molding into the cavity of the secondary mold, and buffers ( It is an operation of injecting the resin constituting the 330 (also referred to as the secondary resin) and providing the buffer portion 330 in the base 320. The cavity of a secondary metal mold | die has a shape corresponding to the buffer part 330 when the base 320 is loaded in the cavity, and the space formed between the loaded base 320 and the cavity.

The hair-growing process is a process of implanting the hair | bristle bundle 310 in the head part 302 of the hair-stitching handle obtained by secondary shaping | molding, and using it as the toothbrush 301. A well-known hair removal apparatus can be used for planting of the bristles 310, for example, can be performed using a flat hair transplanter.

According to the present invention, since the hole peripheral portion 342 is constituted by the buffer portion 330, the stress generated in the base 313 at the time of closing can be alleviated by the buffer portion 330. As a result, generation | occurrence | production of the haircut of the bristles 310 can be prevented. In addition, since the inclined surface 322 is the C surface, the thickness t of the shock absorbing portion 330 is set to a thickness sufficient to prevent the cutting without increasing the depth D1 of the tuft hole 304. The depth D2 of the tuft hole 304 at 320 can be made into the depth which can obtain sufficient tuft strength. As a result, it is possible to prevent the hair cutting of the bristles 310 while maintaining the usability and the hair transplant strength of the toothbrush 301.

In addition, by making the inclined surface 322 into the C surface, the joining area of the base 320 and the shock absorbing portion 330 becomes wider, and the adhesion between the base 320 and the shock absorbing portion 330 can be improved. This can improve the stress relaxation to the base 313.

This invention is not limited to embodiment mentioned above.

In the above-described embodiment, the inclined surface of the periphery of the base hole is the C surface, but the inclined surface may be such that the diameter gradually narrows toward the inner portion of the hair growth hole. °, preferably in the range of 30 to 60 °. For example, the inclined surface may be a curved surface. However, from the viewpoint of improving the effect of preventing cuts, the inclined surface is preferably a surface chamfered at an inclination angle of 45 ° with respect to the C surface, that is, the seedling surface.

In the above-mentioned embodiment, although the tuft hole is a cylindrical shape with a bottom, the shape of a tuft hole is not specifically limited, For example, the cross section may be an ellipse, a polygon, etc. may be sufficient as it.

In the above-described embodiment, although the hair | bristle bundle is implanted by the flat hair-planting, for example, the thermal fusion method which press-fits and fixes the lower end of a hair | bristle bundle into the molten resin used as a hair | bristle hair part, heated the lower end of a hair | bristle bundle, and formed the molten ingot. Subsequently, it may be implanted by an in-mold method or the like in which molten resin is injected into the mold to mold the hair.

Example

(Examples 1A to 5A)

According to the specification of Table 1A, the toothbrush like the toothbrush 1 shown in FIG. 1 was produced. PP was used for the primary resin which comprises a base, and styrene-type elastomer resin (hardness 60) was used for the secondary resin which comprises a buffer part. The hair | bristle bundle made from PTT ((phi) 0.2mm) was made into 20 hair | bristle bundles, and the hair | bristle bundle was folded in two using the seedling machine (made by ZAHORANSKY company), and it was typed in 23 hair | bristle hole with a flat line (250shot / min).

About the toothbrush of each produced example, a short shot, burr generation, the difficulty of peeling, and a hair-planting strength are evaluated, and the result is shown to Table 1A.

(Comparative Example 1A)

A toothbrush was produced in the same manner as in Example 1A, except that the angle of the bonding surface was set to be 180 °, that is, parallel to the planting surface, and the boundary portion was located in the region on the side surface. About the produced toothbrush, a short shot, burr generation, the difficulty of peeling and a hair-planting strength are evaluated, and the result is shown to Table 1A.

(Comparative Example 2A)

The toothbrush was produced like Example 1A except having set the angle of the bonding surface to 90 degrees, and having set the boundary part in the area | region of a seedling surface. About the produced toothbrush, a short shot, burr generation, the difficulty of peeling and a hair-planting strength are evaluated, and the result is shown to Table 1A.

[Table 1A]

(Evaluation of short shot)

Evaluation of the short shot visually confirmed the toothbrush of each case, and classified and evaluated the result according to the following evaluation criteria.

<Evaluation Criteria>

b: The shape and deformation | transformation of a buffer part are not recognized.

c: A large deformation | transformation is not recognized in the shape of a buffer part, but the distortion was seen in part.

d: Large deformation was recognized in the shape of the buffer portion.

(Burr outbreak)

Evaluation of burr occurrence visually confirmed the presence or absence of burr generation with the toothbrush of each case, and classified and evaluated in accordance with the following evaluation criteria.

<Evaluation Criteria>

a: The occurrence of burr was not recognized at all.

b: Burr formation was seen in less than 20% of the boundary.

c: Burr generation was seen in the region of 20% or more and less than 30% of the boundary.

d: Burr generation was recognized in 30% or more of the boundary area.

(Difficulty of Peeling)

The difficulty of peeling was evaluated by classifying the average number of times of use at the time when peeling of the boundary part was confirmed by five monitors using the toothbrush of each case.

<Evaluation Criteria>

a: Peeling was not able to be confirmed at 200 times of use times.

b: Peeling was confirmed at 100 times or more and less than 200 uses.

c: Peeling was confirmed at 50 times or more and less than 100 use times.

d: Peeling was confirmed less than 50 times of use.

(Planting strength)

The hair strength of the hair was held by a dedicated mechanism, and the maximum tensile stress (N) until the hair was removed from the hair hole was measured using an autograph (manufactured by Shimadzu Corporation) (tension speed 20 mm). / min, n = 20). These measurements were classified according to the following evaluation criteria to evaluate the hair transplant strength. In the table, measured values are shown in parentheses together with the evaluation results.

<Evaluation Criteria>

a: 25N or more

b: 20N or more but less than 25N

c: 15N or more but less than 20N

d: less than 15N

(Comprehensive evaluation)

The results of short shot, burr generation, difficulty of peeling, and planting strength were classified according to the following evaluation criteria and taken as comprehensive evaluation.

<Evaluation Criteria>

a: Evaluation of short shot is "b", evaluation of burr generation, peeling difficulty, and hair-plant strength is "b" or "a".

b: Evaluation of short shot is "b", evaluation of burr generation, peeling difficulty, and hair-plant strength is "c"-"a", and there are one or more "c", or evaluation of a short shot "C" and evaluation of burr generation, peeling difficulty, and hair-plant strength are "b"-"a".

c: Evaluation of a short shot is "c", evaluation of burr generation, peeling difficulty, and hair-plant strength is "c"-"a", and there are one or more "c", or a short shot and burr generation In the evaluation of the difficulty of peeling and the hair strength, there is one "d".

d: There are two or more "d" in evaluation of short shot, burr generation, the difficulty of peeling, and hair-plant strength.

As shown in Table 1A, in Examples 1A to 5A to which the present invention is applied, evaluation of burr generation is good as "b" or "a", and evaluation of difficulty of peeling is good as "b" or "a". I did. In addition, the comprehensive evaluation was "b" or "a", and Examples 1A-5A were excellent also in the manufacture ability evaluated by the short shot, the burr generation, and the difficulty of peeling, and the functionality evaluated by the hair-planting strength.

On the other hand, evaluation of the difficulty of peeling of the comparative example 1A which made the angle of the bonding surface 180 degrees is "d". In the comparative example 2 which made the angle of the bonding surface 90 degree, evaluation of a short shot is "d".

From this, it was found that by inclining the bonding surface with respect to the seedling surface, it is possible to prevent the occurrence of short shots and burrs while maintaining the difficulty of peeling and the seedling strength. Moreover, since the toothbrush which this invention applied can prevent burr generation, it turned out that peeling of a buffer part can be suppressed.

(Examples 1B to 8B)

According to the specification of Table 1B, the toothbrush (inclined surface 322: C surface) like the toothbrush 301 shown in FIG. 5 was produced. PP was used for the primary resin which comprises a base, and styrene-type elastomer resin (hardness 60) was used for the secondary resin which comprises a buffer part. Using a hair transplanter (manufactured by ZAHORANSKY), the hair bundles made of PTT (φ 0.2 mm) were made into 20 hairs, and the hair hairs were folded in two and typed together with 23 hairs with a flat line (250 shot / min).

About the toothbrush of each produced example, durability, hair-planting strength, head part strength, and usability are evaluated, and the result is shown to Table 1B.

(Comparative Example 1B)

The toothbrush was produced like Example 1B except having made the surface corresponded to the inclined surface 322 shown in FIG. 5 substantially parallel to a planting surface.

About the produced toothbrush, durability, hair-planting strength, head part strength, and usability are evaluated, and the result is shown to Table 1B.

[Table 1B]

(Evaluation of durability)

Regarding the platelets (made of stainless steel) assuming the molar teeth, the reciprocation was reduced at a load of 400 g, a stroke of 40 mm, and 240 rpm. It was. The recovery of these bromine was classified according to the following evaluation criteria, and durability was evaluated. In addition, in the reciprocating chain, a 50 mass% aqueous solution of a commercial dentifrice was used as the chain liquid.

<Evaluation Criteria>

a: No hair in 150,000 times

b: The hair is generated more than 100,000 times but less than 150,000 times.

c: The hair is generated more than 50,000 times but less than 100,000 times

d: Fell in less than 50,000 times

(Planting strength)

The hair | bristle bundle in one bristle hole was hold | maintained by the dedicated mechanism, and the maximum tensile stress (N) from a bristle hole to a hair | bristle bundle was removed using the autograph (made by Shimadzu Corporation) (tension speed 20 mm / min, n = 20). These measurements were classified according to the following evaluation criteria to evaluate the hair transplant strength. In addition, in a table | surface, the measured value was described in parentheses with the evaluation result.

<Evaluation Criteria>

a: 25N or more

b: 20N or more but less than 25N

c: 15N or more but less than 20N

d: less than 15N

(Head strength)

The hair | bristle hair coming out from the tuft hole of the toothbrush of each case was cut | disconnected, and the sample which smoothed the tuft surface side of the head part was prepared. The sample is fixed to a digital impact tester (DG-1 type, manufactured by Dongyang Precision Machinery Co., Ltd.), weighted at 0.5 J on the woolen side, and the absorbed energy J at the time of breaking of the head portion is measured ( n = 10). This measurement was classified by the following evaluation criteria, and the head portion strength was evaluated. In addition, in a table | surface, the measured value was described in parentheses with the evaluation result.

<Evaluation Criteria>

a: 0.3J or more

b: 0.2J or more but less than 0.3J

c: 0.1J or more but less than 0.2J

d: less than 0.1J

(Evaluation of usability)

Usability was evaluated by 10 subjects who cleaned the oral cavity by the sensory performance of the subject. Specifically, about the operability in the oral cavity, three points when "there is no problem in operation", two points when "the head part feels a little big but there is no problem in operability", and one when "the operation is bad" It evaluated as a point. The average score of the score obtained by this sensory evaluation was classified by the following evaluation criteria, and usability was evaluated. In addition, in a table | surface, the average point was described in parentheses with an evaluation result.

<Evaluation Criteria>

a: 2.5 or more points

b: 2.0 or more and less than 2.5 points

c: 1.5 or more and less than 2.0

d: less than 1.5 points

(Comprehensive evaluation)

Based on the evaluation results of the endurance test, the hair transplant strength, the head strength, and the usability (all of which are referred to as evaluation items), the classification was performed according to the following evaluation criteria to obtain a comprehensive evaluation.

<Evaluation Criteria>

a: Each evaluation of endurance test, hair-plant strength, and head strength is "b" or "a", "a" is two or more, and usability evaluation is "b" or "a".

b: Each evaluation of the durability test, the hair growth strength and the head portion strength is "b" or "a" and "a" is two or more, and the usability evaluation is "c", or the durability test, the hair growth strength, the head portion While each evaluation of strength is "b" or "a", "a" is one or less, and usability evaluation is "c"-"a".

c: Each evaluation of endurance test, hair-plant strength, and head part strength is "c"-"a", "c" is one or more, and usability evaluation is "c"-"a".

d: One of the evaluation items is "d".

As shown in Table 1B, Examples 1B to 8B to which the present invention was applied were all excellent in durability, planting strength, and head portion strength.

On the other hand, the comparative example 1B which did not make an inclined surface peripheral part of the base hole was inferior in the point of durability.

Industrial availability

ADVANTAGE OF THE INVENTION According to this invention, the toothbrush which can prevent peeling of a buffer part can be provided, suppressing the usage-amount of an elastomer resin for preventing hair. Moreover, the toothbrush which can prevent the hair loss of a haircut, maintaining usability and hair-plant strength can be provided.

1: toothbrush 2, 102, 202: head part
4: planting hole 5: planting surface
6: side 7: curved surface
20, 120, 220: 22, 122, 222: junction surface
30, 130, 230: buffer part 32: boundary part
42: periphery of the hole 124, 232: convex portion
132, 224: recess 301: toothbrush
302: head portion 304: seeding hole
305: cotton wool 320: expectation
321: periphery of the base hole 322: the inclined surface
330: buffer part 342: hole periphery

Claims (14)

The head part in which the hair-flock is implanted is a curved surface between the seedling surface for planting the hair-stuck, and the side surface adjacent to this, The plurality of hair-frilling holes are formed in the said woolen surface, and the periphery of the hair-stitch hole is harder than the material of expectation. A toothbrush that is a buffer part formed of low resin,
The buffer part is joined to the base in the region of the curved surface,
The toothbrush according to claim 1, wherein the joining surface between the buffer portion and the base is an inclined surface inclined toward the outside of the head portion when the planting surface is the reference. The method of claim 1,
The said joining surface is a toothbrush of 100-150 degrees with respect to the said seedling surface. 3. The method according to claim 1 or 2,
The said joining surface is provided with the convex part in one of the said base and the said buffer part, and the recessed part which fits into the said convex part is formed in the other side, The toothbrush characterized by the above-mentioned. 3. The method according to claim 1 or 2,
The said buffer part is a toothbrush, The thickness of the said base phase is 0.1-1.0 mm. 3. The method according to claim 1 or 2,
A toothbrush, wherein the distance in the planting surface direction between the side of the head portion and the outer periphery of the buffer portion is 0.1 to 0.9 mm. As a toothbrush which is a buffer part in which the head part into which a hair-bristled hair is implanted is formed with the some hair-frilling hole in the hair-planting surface, and the periphery of the said hair-frilling hole is formed from resin whose hardness is lower than a material of expectation,
At the periphery of the opening side of the tuft hole in the base, an inclined surface that gradually narrows in diameter toward the inner part direction of the tuft hole is formed.
Toothbrush characterized in that the buffer portion is formed in the region including the inclined surface. The method according to claim 6,
The said inclined surface is a toothbrush which is a surface shown by chamfering a corner part at the angle of 45 degree | times from each surface orthogonal two corner parts. 8. The method of claim 7,
The said inclined surface is chamfered at the angle of 45 degree | times at the position of 0.1-0.8 mm from the intersection of the said two orthogonal surfaces, The toothbrush characterized by the above-mentioned. 9. The method according to any one of claims 6 to 8,
The said buffer part is a toothbrush, The thickness of the said base phase is 0.1-1.0 mm. 9. The method according to any one of claims 6 to 8,
A toothbrush, wherein the hair bundles that bundle the plurality of chain hairs are grafted in two by using a flat plate. The method of claim 3, wherein
The said buffer part is a toothbrush, The thickness of the said base phase is 0.1-1.0 mm. The method of claim 3, wherein
A toothbrush, wherein the distance in the planting surface direction between the side of the head portion and the outer periphery of the buffer portion is 0.1 to 0.9 mm. 5. The method of claim 4,
A toothbrush, wherein the distance in the planting surface direction between the side of the head portion and the outer periphery of the buffer portion is 0.1 to 0.9 mm. The method of claim 9,
A toothbrush, wherein the hair bundles that bundle the plurality of chain hairs are grafted in two by using a flat plate.

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