CN110113963A - Toothbrush - Google Patents

Abstract

The present invention provides a kind of toothbrush, will not generate warpage, the albefaction of resin, cracking on the head that flat wire type plants hair method, it is ensured that enough plant Mao Qiangdu, operability is excellent in oral cavity.Toothbrush (1), which has, is provided with multiple heads (10) for planting pore (13) on plant hair side (12), beam have the pieces of more bristles by (15) one folding of flat wire be two, implantation plant pore (13) in, wherein, head (10) with a thickness of 2.0mm or more 4.0mm or less；The plant follicle population for planting pore (13) is 25 holes/cm²More than；It is X in the internal diameter for planting pore, the flat wire meets 0.37mm≤(X-d)/2≤0.55mm relationship when X is 0.9mm or more, 1.3mm or less with a thickness of d.

Description

Toothbrush

Technical field

The present invention relates to toothbrushes.

This application claims based on January 17th, 2017 in Japan file an application Japanese patent application the 2017-005804th Priority, and its content is quoted herein.

Background technique

In order to prevent periodontosis, the tartar for removing the narrow gaps such as portion between neck portion, tooth is important.Therefore, it has carried out Following researchs: in order to improve entering that the hair front end of toothbrush enters between narrow gap, and the bristle for using front end super thin； In order to assign pieces with the flexure of appropriateness, and plant pore is made to become smaller；Expand the research such as configuration space for planting pore.

Plant pore is set to become smaller, hair becomes easy flexure, and the means as the entering for improving hair front end are very effective, still Since hole becomes smaller, gross weight is reduced, it may occur that brush sweeps the reduction of true feeling.Therefore, it has studied by increasing hole count and has both hair The entering and brush of front end sweep the plant hair portion means of true feeling.

In the case that flat wire type plants hair method, if porous, the quantity for squeezing into the flat wire on head becomes more, quilt The resin that flat wire is pushed open also becomes more, thus there is the worry for being easy to happen the warpage on head, the cracking of resin, albefaction, still Following toothbrushes are disclosed in patent document 1: warpage, resin will not occur for the head that aperture × porous while flat wire type plants hair method Albefaction, cracking, it can be ensured that enough plant Mao Qiangdu.

The toothbrush is set by the volume (resin destruction volume) for the resin that will be destroyed by flat wire within the specified scope, to prevent The generation of the warpage on head.

Existing technical literature

Patent document

Patent document 1:JP special open 2005-177377 bulletin

Summary of the invention

Problem to be solved by the invention

In addition, in toothbrush, it sometimes appear that in order to improve operability, can brush and sweep to intraoral each corner, and incite somebody to action The case where head is thinned.However, when head is thinned, ratio relative increase due to flat wire relative to head resin, Thus head, which becomes easy, occurs warpage, the albefaction of resin, cracking.Especially, in the case where " aperture × porous ", head is squeezed into Flat wire quantity become it is more, further warpage, albefaction, cracking become easy generation, thus can not be achieved head is slim Change and aperture × porous plant hair portion means.

Therefore, the present inventor's further progress experiment and research, as a result, it has been found that: the warpage on head and internal diameter, the plant hair of plant pore Hole density, relative to driving depth of flat wire for planting pore etc., there are substantial connections.

The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to provide a kind of toothbrush, will not plant in flat wire type Warpage, the albefaction of resin, cracking occur in the head of hair method, it is ensured that enough plant Mao Qiangdu, operability is excellent in oral cavity.

The means solved the problems, such as

In order to achieve the above objectives, the toothbrush of one embodiment of the present invention has and is provided with multiple plants on plant hair side The head of pore, it by flat wire (flat plate) folding is two that beam, which has the pieces of more bristles, the implantation plant pore, special Sign is, the head with a thickness of 2.0mm or more 4.0mm hereinafter, by by straight line by the outside connection for planting pore and At part area be set as plant gross area (cm²) when, by sum (hole)/plant gross area (cm of plant pore²) indicate plant pore Density is 25 holes/cm²More than, be X in the internal diameter for planting pore, the flat wire with a thickness of d, X be 0.9mm or more, When 1.3mm or less, meet 0.37mm≤(X-d)/2≤0.55mm relationship.

In the toothbrush of one embodiment of the present invention, relative to the flat wire for planting pore to bury volume (flat The volume that a pair in head buries portion is buried in the radial outside for planting pore in horizontal line) it can be 0.06mm³The above 0.20mm³ Below.

Herein, the volume that buries of flat wire is equivalent in flat wire and buries in a pair that is buried in head of radial outside for planting pore Do not have the volume in portion.

Can be following compositions in the toothbrush of one embodiment of the present invention: the two sides of the flat wire have multiple ditches.

In the toothbrush of one embodiment of the present invention, can be following compositions: the head be by bending elastic modulus 1000MPa or more, 2800MPa resin below are formed.

Invention effect

In toothbrush of the invention, warpage, the albefaction of resin, cracking will not occur for the head that flat wire type plants hair method, it is ensured that Enough plant Mao Qiangdu, operability is excellent in oral cavity, can fully brush the neck portion of backteeth.

Detailed description of the invention

[Figure 1A] is the plan view for showing the toothbrush of embodiments of the present invention.

[Figure 1B] is the lateral plan for showing the toothbrush of embodiments of the present invention.

[Fig. 2A] is to show the figure for planting pore, for along the sectional view in direction in length and breadth.

[Fig. 2 B] is to show the figure for planting pore, for along the sectional view of short transverse.

[Fig. 3] is the lateral plan for showing flat wire.

[Fig. 4] is the specification for showing embodiment and comparative example and the figure of their evaluation.

[symbol description]

1 ... toothbrush；10 ... heads；11 ... pieces；11a ... bristle；12 ... plant hair side；13 ... plant pore；15 ... flat wires； The side 15a ...；16 ... ditches；20 ... necks；30 ... handle portions；35 ... put finger protrusion；T ... thickness；The internal diameter of X ... plant pore.

Specific embodiment

Hereinafter, being illustrated in conjunction with Figure 1A, Figure 1B~Fig. 4 to the embodiment of toothbrush of the invention.

Figure 1A, Figure 1B are the figure for showing the toothbrush 1 of present embodiment, are (a) plan view, (b) lateral plan.

Toothbrush 1 has: being implanted with the head 10 of the pieces 11 of bristle 11a, the neck being extended from the rear end side on head 10 Portion 20, and the handle portion 30 being extended from the rear end side of neck 20.

Hereinafter, by head 10 and neck 20 and handle portion 30 collectively handle body 40.

Head 10 is the position of front end side in handle body 40 as shown in Figure 1A, Figure 1B.

Neck 20 be in handle body 40 with a sequence of position of the rear end side on head 10.

Handle portion 30 is the position of side opposite with head 10 in handle body 40 as shown in Figure 1A, Figure 1B, is to finger pad portion Position until 35.

Hereinafter, being described in detail to the composition at each position.

Hereinafter, the length direction (left and right directions in Figure 1A, Figure 1B) on head 10 is known as longitudinal.By the width on head 10 Direction (up and down direction in Figure 1A) is known as laterally.By the thickness direction (up and down direction in Figure 1B) on head 10 be known as it is high or It is thick.

Handle body 40 is integrally integrally formed as strip, such as can obtain using resin as material, by injection moulding.

As the material of handle body 40 made of integrally formed, can enumerate bending elastic modulus (JIS7171) is 1000MPa Above, 2800MPa resin below, it can be mentioned, for example acrylic resins (PP), polyacetal resin (POM), saturated polyester resin (PCTA), polystyrene resin (PS), pet resin (PET), polybutylene terephthalate (PBT) tree Rouge (PBT), acrylonitrile butadiene styrene resin (ABS), polyarylate resin, polycarbonate resin, resin acrylonitrile styrene resin (AS) etc..

Among these, from the point of view of it can control cost, preferred acrylic resin.On the other hand, due to polypropylene The bending elastic modulus of resin be 1500MPa or more, 2000MPa hereinafter, thus when being thinning head 10, be easy to happen and stick up Song etc..However, the shape of the toothbrush 1 by using aftermentioned present embodiment, also can be used the elasticities of flexure mould such as polypropylene Measure lower resin.

Above-mentioned resin can be used alone a kind, or can be used in combination of two or more.

In addition, grip in order to improve, handle body 40 is such as the resin portion of the softness by elastomer or all coverings.

The bending bullet for the resin that the bending elastic modulus (JIS7171) of handle body 40 is used as the material of handle body 40 Property modulus be preferably 1000MPa or more, 2800MPa hereinafter, more preferably 1200MPa or more, 2500MPa are hereinafter, further excellent It is selected as 1500MPa or more, 2000MPa or less.

In addition, handle body 40 is integrally integrally formed construction, but is not limited to head 10, neck in present embodiment It is constructed made of portion 20, handle portion 30 are integrally formed.For example, can be following constructions: head 10, neck 20, among handle portion 30 At least any one with unlike material make and make respectively engage made of construction.

In addition, when making head 10, neck 20, handle portion 30 with unlike material, at least material as head 10, use Above-mentioned material.At this point, the bending elastic modulus (JIS7171) at least head 10 be preferably 1000MPa or more, 2800MPa hereinafter, More preferably 1200MPa or more, 2500MPa are hereinafter, further preferably 1500MPa or more, 2000MPa or less.

The whole length of handle body 40 can be determined according to operability etc..The whole length of handle body 40 is, for example, 150~200mm or so.

Head 10 have in plan view 4 top by with the flat shape of approximation quadrangle made of curve corner cut Shape.It is contemplated that the characteristics such as operability determine the size on head 10 in oral cavity.

When the width on head 10 is excessive, intraoral operability is reduced, and when the width is too small, the quantity of the pieces 11 of implantation becomes It is very few, it is easily damaged to clean effect.Therefore, the maximum width of the transverse width on head 10 for example may be set to 5mm~16mm or so, From the point of view of being inserted into intraoral insertion property, preferably 11mm or less.

When the length on head 10 is too long, intraoral operability is easily damaged, when the length is too short, the number of the pieces 11 of implantation Amount becomes very few, and it is easily damaged to clean effect.Therefore, the length on head 10 can be for example set in the range of 10mm~33mm.

Thickness (height) t on head 10 is preferably in the range of 2.0mm or more 4.0mm or less, more preferably in 2.5mm or more In the range of 3.5mm or less.As shown in Figure 1B, when the thickness t on head 10 is below the upper limit value, the mouth of toothbrush 1 can be improved Transluminal operation.In addition, the strength reduction on head 10 can be prevented when the minimum thickness on head 10 is more than the lower limit value.

As shown in Figure 1A, it is planted on hair side 12 on the surface on head 10, is formed with multiple plant pores 13.Plant the interior of pore 13 Diameter X is preferably in the range of 0.9mm~1.3mm.When in the range, planting pore 13 becomes aperture, and the outer diameter of pieces 11 attenuates. The internal diameter X of pore 13 is planted more preferably in the range of 1.0mm~1.3mm, further preferably 1.1mm~1.3mm.In each plant hair In hole 13, it is implanted with pieces 11 respectively.

As the bristle 11a for constituting pieces 11, can be used: towards the gradually smaller bristle (taper of its diameter of hair front end Hair), remaining the bristle (straight hair) that roughly same outer diameter, hair front end are flat, spherical, preceding other than the rounded portions of defeathering front end Hold the bristle of the shapes such as forked.

As the material of bristle 11a, it can be mentioned, for example: polyamide (such as: 6-12 nylon, 6-10 nylon), polyester (example Such as: polyethylene terephthalate, polybutylene terephthalate (PBT), polypropylene terephthalate), polyolefin (example Such as: polypropylene), elastomer (such as: olefin-based, polystyrene) synthetic resin material.These resin materials can be used alone 1 Two or more is applied in combination in kind.

Especially, bristle 11a further preferably has at least 1 layer or more of the sheath portion for having core and being arranged on the outside of the core Multiple core sheath structure (double core sheath structure) the bristle made of polyester.With multiple core sheath structure (double core sheath structure) When, different polyester can be used in core and sheath portion, thus the adjustment of mechanical properties becomes easy.Therefore, it can be easy to obtain Rigidity is strong, the higher bristle of scavenging of tartar.As polyester that can be different from used in the bristle of sheath portion in core Combination, preferably such as polybutylene terephthalate (PBT) (PBT) and polyethylene terephthalate (PET).

Therefore, in present embodiment, as bristle 11a, using core by polybutylene terephthalate (PBT) resin (PBT) It is formed, the bristle for the double core sheath structure (double core sheath ST maos) that sheath portion is formed by polyethylene terephthalate resin (PET). Therefore, it can be easy to get that rigidity is strong, the higher bristle of scavenging of tartar.

The cross-sectional shape of bristle 11a is preferably circular, but is not necessarily limited to circle, can be according to the mesh of toothbrush 1 Purposes and be set as arbitrary shape.For example, it can be set as ellipse, polygon (for example, triangle, quadrangle, five Side shape, hexagon etc..), irregular shape (for example, star, the cloverleaf pattern of three pieces leaf, bunge bedstraw herb shape of four leaves etc.) etc..

Constitute pieces 11 bristle 11a, both can all identical thicknesses, different thicknesses of more than two kinds can also be combined Bristle 11a.In addition, from the point of view of intraoral usability, use feeling, it is preferable that the diameter of selected bristle 11a is got over It is small, then more shorten the staple length of bristle 11a.In addition, sense can be swept according to use feeling, brush, clean the purpose of effect, durability, combination Use more different bristle 11a of thickness.

In order to make when 10 insert port of head is intracavitary neck 20 contact lip, the length of neck 20 for example be preferably 25~ 70mm。

The formation of neck 20 in present embodiment are as follows: width gradually becomes from the position of minimum value 21 towards rear end side direction Greatly.It is contemplated that material etc. determines the width of neck 20, for example, the minimum widith of neck 20 be preferably 3.5mm or more, 4.5mm is hereinafter, more preferably 3.7mm or more, 4.3mm or less.When it is more than above-mentioned lower limit value, neck 20 can further improve Intensity, when below above-mentioned upper limit value, lip is easy closure, in addition, the attainability for reaching backteeth can be improved, while can be into One step improves operability in oral cavity.

Fig. 2A is to show the figure for planting pore 13, for along the sectional view in direction in length and breadth.Fig. 2 B is cutting along short transverse Face figure.Fig. 3 is the lateral plan for showing flat wire 15.

Hereinafter, the length direction of flat wire 15 (left and right directions in Fig. 2A and Fig. 3) is known as longitudinal.By flat wire 15 Width direction (up and down direction in Fig. 2A) be known as it is laterally or thick.By the thickness direction of flat wire 15 (in Fig. 2 B and Fig. 3 Up and down direction) it is known as height.

The fur planting method of pieces 11 plants hair method according to following flat wire types: being two by one folding of pieces of bristle 11a, will sandwich Flat wire 15 therebetween, which is squeezed into, plants in pore 13, and the flat wire type that pieces 11 is implanted into pore 13 is planted hair method accordingly.Plant hair Intensity is preferably 8N or more, more preferably 10N or more, particularly preferably 15N or more.

Flat wire 15 is driven into a manner of the central part by planting pore 13 and across plant pore 13 plants pore 13.As The material of flat wire 15 can lift for example, the sheet metals such as brass, stainless steel, in addition to this can also enumerate rigid plastics, biodegrade Property plastics etc..

As shown in figure 3, the thickness d of flat wire 15 is preferably 0.15mm~0.30mm, more preferably 0.18mm~0.25mm, Further preferably 0.18mm~0.22mm.

The height H of flat wire 15 is preferably 1.0mm~1.5mm, more preferably 1.0mm~1.3mm.

The length L1 of flat wire 15 is preferably 1.4mm~1.8mm.

Preferably, flat wire 15 is bounded on each side face 15a, 15a respectively and is formed with multiple ditches 16.The width w1 of ditch 16 be 0.1~ 0.3mm, height h1 are 0.03~0.075mm.

In addition, the shape and quantity etc. of ditch 16 are not limited to person as shown in the figure.In addition, from the degree of difficulty that falls off of flat wire 15 Angle consideration, preferably band ditch person, but not limited to this.The flat wire of the plane tabular without ditch can be used.

Plant hair side 12 on head 10 is formed with multiple plant pores 13, but it arranges pattern and is not particularly limited.For example, As shown in Figure 1A, plant pore 13 can for by be in the width direction on head 10 3~5 column and on the length direction on head 10 For the arrangement that 10~12 column are formed, or the U-shaped arrangement for not planting hair-fields domain etc that can be a part of for encirclement.

Either which kind of pore arrangement, in the area for setting part made of the outside (tangent line) for connecting plant pore 13 as straight line The area for planting hair range 13A is to plant gross area (cm²) when, by sum (hole)/plant gross area (cm of plant pore 13²) indicate plant Follicle population (quantity of the plant pore of unit area) is preferably 25 holes/cm²More than, more preferably 28 holes/cm²More than, further Preferably 30 holes/cm²More than.In addition, it is preferably 40 holes/cm²Hereinafter, more preferably 37 holes/cm².When in the range, plant Follicle population can improve (by increasing hole count, gross weight increases), even fine, soft fur beam can also maintain high brush to sweep true feeling.

In the toothbrush 1 of present embodiment, as shown in Figure 2 A, setting are as follows: in the internal diameter for setting plant pore 13 as X, flat wire 15 With a thickness of d, when X is 0.9mm or more, 1.3mm or less, meet following formula (1).

0.37mm≤(X-d)/2≤0.55mm (1)

As shown in Figure 2 B, the hole depth M of pore 13 is planted preferably in the range of 2.2~3.5mm.In addition, in order to ensure planting The back side thickness (the thickness N at the back side 14 from the bottom hole 13b of plant pore 13 to head 10) of the hole depth of pore 13, head 10 is excellent It is selected in 0.7mm or less.Planting pore spacing (distance between the center of 2 adjacent plant pores 13) is preferably 1.2~2.4mm.

Herein, bristle gross area B is subtracted obtained from the area of flat wire 15 in the area for planting pore 13 from one Shared ratio is set as fill factor (packing factor) (B/A × 100%) in practical plant hair gross area A.

Flat wire type plants Mao Fazhong, and pieces 11 is folded, and head 10 is fixed in by flat wire 15, therefore, with certain value When above fill factor plants hair, as shown in Fig. 2A, Fig. 2 B, the value of (X-d)/2 of formula (1) and the thickness of pieces 11 have relationship, This becomes the index for indicating the distance of the bottom surface 15c from the bottom hole 13b of plant pore 13 to flat wire 15, and also becoming indicates flat wire The index of 15 driving depth.

Toothbrush 1, as shown in Figure 1B, the thickness t on head 10 are thin, when the plant follicle population of plant pore 13 is high, are easy on head 10 occur warpage.In the toothbrush 1 for being thinned head 10, when flat wire 15 is relatively shallowly squeezed into relative to plant pore 13, head 10 occur warpage.Think that its reason is: planting the resin near the opening of pore 13 and be open to extend aperture, plant hair side accordingly 12 expansions.Therefore, the plant follicle population for planting pore 13 is higher, and the quantity of squeezing into of flat wire 15 all the more increases, thus on head 10 Middle warpage is easy to become significant.

In contrast, when flat wire 15 is squeezed into deeper relative to plant pore 13, head 10 is difficult to happen warpage.Although Reason is unclear, but it is believed that its reason is: by squeezing into flat wire 15 deeper, accordingly relative to pore 13 is planted Resin is pulled to the bottom side for planting pore 13, thus the aperture for planting the open side of pore 13 is difficult to generate variation.Thus it estimates: planting hair Face 12 will not be expanded, and head 10 is difficult to happen warpage.

Therefore, as described in this embodiment, in the toothbrush 1 for being thinned head 10, by imposing a condition so that falling In the range of entering formula (1), thus prevent the warpage on head 10, the albefaction of resin, cracking generation.It is examined from the angle of formula (1) Consider, the driving depth relative to the flat wire 15 for planting pore 13 is excellent because that can obtain good plant Mao Qiangdu in 0.45mm or more Choosing.In addition, from the point of view of formula (1), the driving depth relative to the flat wire 15 for planting pore 13 is in 0.55mm or less because can Further to keep the intensity on head 10 and it is preferred that.In addition, the driving depth relative to the flat wire 15 for planting pore 13 is above-mentioned When in range, plants pore 13 and become smaller, pieces diameter attenuates, therefore can be improved into the entering between the narrow gap of tooth.

In addition, burying volume in 0.06mm relative to the flat wire 15 for planting pore 13 in toothbrush 1³Above, 0.20mm³With Under (particularly preferably in 0.08mm³Above, 0.13mm³It, can also even if for aperture and planting follicle population height when in the range of below) Prevent the warpage on head 10 and the albefaction of resin, cracking.

The internal diameter X for planting pore 13 is 0.9mm~1.3mm.Therefore, flat wire 15 from the both ends of length direction respectively The range of 0.2mm~0.25mm is buried in the resin on head 10.The volume that buries of flat wire 15 is equivalent in flat wire 15 A pair that the radial outside of plant pore 13 is buried in head 10 buries the volume of portion 15b, 15b.

In toothbrush 1, due to relative to plant pore 13 flat wire 15 bury volume settings obtain it is smaller, by flat wire The quantitative change of 15 resins pushed open is few.It is therefore possible to prevent the warpage on head 10.

For flat wire 15 in the case where two sides 15a, 15a have the band ditch flat wire of multiple ditches 16, resin enters this In a little ditches 16, the amount for the resin pushed open by flat wire 15 can be inhibited accordingly, the warpage on head 10 can be further prevented.Separately Outside, resin enters in each ditch 16 of flat wire 15, and flat wire 15 becomes difficult to fall off from plant pore 13 accordingly.Therefore, in order to Further obtaining above-mentioned fall off prevents effect, is preferably with ditch flat wire 15 compared with no ditch flat wire.

As described above, the head 10 of present embodiment is that 1000MPa or more, 2800MPa are below by bending elastic modulus Resin is formed.That is, can control the cost of toothbrush 1 by using the resins for universal use of acrylic resin etc.

Moreover, as noted previously, as take the countermeasure of the warpage on head 10, therefore it is thinning even if being formed by resins for universal use Head 10, it is also difficult to warpage etc. occur.

In addition, as shown in Figure 2 B, in order to ensure planting the hole depth M of pore 13, and the back side thickness N on head 10 is set in Even if 0.7mm gets to flat wire 15 compared with bottom, head 10 is also difficult to warpage, in addition may be used hereinafter, accordingly relative to pore 13 is planted To ensure enough plant Mao Qiangdu.

About the value of fill factor (B/A × 100%), preferably 70~90%, more preferably 75~85%.With the range The distance of bottom surface 15c from the bottom hole 13b of plant pore 13 to flat wire 15 is set in above-mentioned formula (1) by interior fill factor When in range, above-mentioned good plant Mao Qiangdu can be obtained, and the albefaction etc. of resin will not occur on head 10, thus be more Preferably.

In addition, the arrangement pattern for planting pore 13 is not limited to above-mentioned pattern, it can be so-called clathrate, staggered etc..Plant hair Hole density is in 25 holes/cm²Above 40 holes/cm²It can be arbitrary arrangement pattern when following.

[embodiment]

Fig. 4 is the specification for showing embodiment and comparative example and the figure of their evaluation.

Hereinafter, enumerating embodiment, the present invention is explained in detail, but the present invention is not limited to following embodiments, can not take off From suitably change is implemented in the range of its main idea.

(using material)

1~embodiment of < embodiment 3,1~comparative example of comparative example, 2 >

Handle body 40: acrylic resin

Bristle 11a: core sheath ST maos double (core: PBT, sheath portion: PET)

(1~embodiment of embodiment 3,1~comparative example of comparative example 2)

By the handle body 40 of injection moulding production Figure 1A, Figure 1B, it is two by 11 1 folding of pieces of bristle 11a, will be sandwiched between Flat wire 15 squeeze into plant pore 13 in.It carries out like this, pieces 11 is implanted into and plants pore 13.

For the cleaning effect in the neck portion as backteeth operational in oral cavity of each toothbrush 1, the warpage on head 10, tree The generation of albefaction and the cracking of rouge, plant hair intensity are evaluated.

(evaluation method of the cleaning effect in the neck portion of backteeth)

The toothbrush cleanout of 10 commentator's Examples 1 to 3 and comparative example 1~2 is intracavitary, evaluates according to following evaluation criteria The cleaning effect in the neck portion of backteeth at this time.

About the cleaning true feeling in neck portion, above-mentioned commentator is allowed to evaluate with 5 grades.Specifically, " will can feel very much Clean sense " 5 points are denoted as, " slightly feeling cleaning sense " is denoted as 4 points, and " feeling cleaning sense " is denoted as 3 points, " can less feel Clean sense " 2 points are denoted as, " imperceptible cleaning sense " is denoted as 1 point.

4.0 or more the situation of being equally divided into of 10 commentators is evaluated as ◎, 3.0 more than and less than 4.0 the case where be evaluated as Zero, 2.0 more than and less than 3.0 the case where be evaluated as △, less than 2.0 the case where is evaluated as ×.

(evaluation method of the warpage on head)

The toothbrush handle of pieces is implanted with from side shooting by microscope (Keyemce (KEYENCE) company: VHX-100).It will It evaluates the image of toothbrush and is not implanted into the picture registration for not planting mao handle of pieces, before measuring head by electronic digital indicator The offset of the die parting line (parting line) at end, is denoted as the warpage (n=6) on head 10.The evaluation of warpage is according to following 3 etc. The evaluation of grade carries out.

◎: less than 0.5mm

△: 0.5mm more than and less than 0.7mm

×: 0.7mm or more

(evaluation method of the generation of albefaction, the cracking of resin)

Confirm (n=1000) by visual observation, evaluates the generation of cracking, the albefaction of toothbrush.Specifically, be cracked the incidence of albefaction It is evaluated as " ◎ " when being 0%, is evaluated as "○" when less than 20%, 20% or more when is evaluated as "×".

(evaluation method for planting hair intensity)

Whole bristles in 1 hole are caught by special implement, the Autograph manufactured using Shimadzu Seisakusho Ltd. is measured until hair Maximum tensile stress (N) (tensile speed 20mm/min) (n=20) until pulling out in Shu Congzhi pore, is commented according to the value Valence.Specifically, it is evaluated as "○" when average value is 15N or more, " △ " is evaluated as when 8N is more than and less than 15N, is less than the 8N news commentary Valence is "×".

As shown in figure 4, having been acknowledged: in the Examples 1 to 3 of toothbrush 1, the thickness t on head 10 is 2.0mm~4.0mm's In range, plant follicle population is 25 holes/cm²More than, X in 0.9mm or more, 1.3mm hereinafter, meet formula (1), therefore in oral cavity Operability, the warpage on head 10, the albefaction of resin, cracking generation, plant hair intensity it is each evaluate in obtain good result.

In addition, the volume that buries relative to the flat wire 15 for planting pore 13 is 0.06mm in the Examples 1 to 3 of toothbrush 1³ Above, 0.20mm³Below.

In addition, in the Examples 1 to 3 of toothbrush 1, the distance of the bottom surface 15c from the bottom hole 13b of plant pore 13 to flat wire 15 is 0.5mm or less.In 0.5mm or less, flat wire 15 is squeezed into deeper, thus can obtain the effect that head 10 is difficult to warpage Fruit.

On the other hand, have been acknowledged: in the comparative example 1~2 of toothbrush 1, in oral cavity operability, head 10 warpage, It can not be obtained in any one of the generation of albefaction, the cracking of resin, each assessment item for planting hair intensity mesh satisfactory As a result.

More than, suitable embodiment according to the present invention is illustrated in conjunction with attached drawing, but the present invention is not limited to institutes These examples being related to.It is understood that if it is those skilled in the art, the technology recorded in patent claims In the scope of thought, alternatively it is conceivable to which various variations or modification is it will be apparent that also belonging in the nature of things about these In technical scope of the invention.

Claims (4)

1. a kind of toothbrush, has the heads planted and be provided with multiple plant pores on hair side, beam has the pieces of more bristles flat One folding of line is two, in the implantation plant pore, which is characterized in that

The head with a thickness of 2.0mm or more, 4.0mm hereinafter,

The plant follicle population for planting pore is 25 holes/cm²More than,

The internal diameter for planting pore is X, and the flat wire meets following when X is 0.9mm or more, 1.3mm or less with a thickness of d Relationship:

0.37mm≤(X-d)/2≤0.55mm.

2. toothbrush according to claim 1, wherein be relative to the volume that buries of the flat wire for planting pore 0.06mm³Above, 0.20mm³Below.

3. toothbrush according to claim 1 or 2, wherein the two sides of the flat wire have multiple ditches.

4. toothbrush described in any one of claim 1 to 3, wherein the head is 1000MPa by bending elastic modulus Above, 2800MPa resin below is formed.