CN116634905A - Toothbrush with tooth brush - Google Patents
Toothbrush with tooth brush Download PDFInfo
- Publication number
- CN116634905A CN116634905A CN202180086422.3A CN202180086422A CN116634905A CN 116634905 A CN116634905 A CN 116634905A CN 202180086422 A CN202180086422 A CN 202180086422A CN 116634905 A CN116634905 A CN 116634905A
- Authority
- CN
- China
- Prior art keywords
- toothbrush
- foam
- molded body
- grip
- foam molded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B5/00—Brush bodies; Handles integral with brushware
- A46B5/02—Brush bodies; Handles integral with brushware specially shaped for holding by the hand
- A46B5/021—Grips or handles specially adapted to conform to the hand
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B5/00—Brush bodies; Handles integral with brushware
-
- A—HUMAN NECESSITIES
- A46—BRUSHWARE
- A46B—BRUSHES
- A46B2200/00—Brushes characterized by their functions, uses or applications
- A46B2200/10—For human or animal care
- A46B2200/1066—Toothbrush for cleaning the teeth or dentures
Landscapes
- Brushes (AREA)
Abstract
The toothbrush comprises a toothbrush body having a grip part having a length along a center line, a neck part extending from a tip of the grip part, and a head part disposed on a side of the neck part opposite to the grip part, and a brush part formed of a plurality of tufts implanted in the head part, wherein the toothbrush body comprises a grip part body, the neck part, and the head part, a base member formed of a hard resin, and a foam molded body formed of a soft resin disposed on a surface of the grip part body, wherein the foam molded body has a filling part and a plurality of void parts, and wherein a storage elastic modulus of the foam molded body is 104Pa to 106.5 Pa.
Description
Technical Field
The present application relates to toothbrushes.
The present application claims priority based on japanese patent application publication No. 2020-214656, 12/24/2020, and the contents of which are incorporated herein by reference.
Background
Generally, a toothbrush includes a toothbrush main body having a rod-shaped grip portion, a neck portion extending from a distal end of the grip portion, and a head portion provided at a distal end of the neck portion, and a plurality of tufts implanted in the head portion. The toothbrush main body is formed of a hard resin so that excessive deflection of the grip portion at the time of brushing can be suppressed, and a sufficient force can be applied from the tufts to the teeth.
However, in a toothbrush in which the toothbrush main body is formed of only a hard resin, the grip portion is hard and difficult to flex, so that the grip performance is poor. As a result, there is a risk of mishandling the toothbrush during brushing, thereby damaging the inside of the oral cavity.
As a toothbrush for improving the grasping performance when grasping the grasping portion with a hand, a toothbrush provided with a grasping portion in which the surface of a rod-shaped core portion formed of a hard resin is partially or entirely covered with a soft resin has been proposed (for example, patent document 1). Further, a toothbrush having a structure in which a soft resin and a hard resin are exposed on the surface of a grip portion, respectively, has been proposed (for example, patent document 2).
[ Prior Art literature ]
[ patent literature ]
Patent document 1: JP-A2017-000407
Patent document 2: international publication WO 2016-208333
Disclosure of Invention
[ problem to be solved by the application ]
However, in the case of the structure as in patent document 1, the hardness of the soft resin to be used is limited, and in order to secure sufficient gripping properties, it is necessary to design the soft resin to be thick. In the case of the structure as in patent document 2, although a resin having higher soft properties can be used, it is necessary to design the grip portion in consideration of the ratio of the hard resin to the soft resin, and the like.
Accordingly, a structure that is not limited in design and that can improve the grasping property is desired.
The present application has been made in view of the above-described problems, and an object thereof is to provide a toothbrush which is not limited in design and can improve gripping properties.
[ means for solving the problems ]
A toothbrush according to an aspect of the present application includes a toothbrush main body and a brush section, the toothbrush main body including: a grip portion having a length along a center line, a neck portion extending from a front end of the grip portion, and a head portion provided on a side of the neck portion opposite to the grip portion, the brush portion being formed of a plurality of tufts implanted in the head portion, the toothbrush main body having: the base member (base member) is provided with a grip body, the neck portion, and the head portion, and is made of a hard resin, and the foam molded body is provided on the grip body surface, and is made of a soft resin, and has a filling portion and a plurality of void portions, and has a storage elastic modulus G' of 104Pa to 106.5 Pa.
According to this structure, since the foam molded body is provided on the surface of the grip portion main body, the grip portion can be appropriately deformed with a normal grip force, and an effect of improving the grip performance of the hand and facilitating the brushing can be obtained.
In one embodiment of the present application, the toothbrush may have the following structure: the foam molding has a loss elastic modulus G' of 104Pa to 106.5 Pa.
According to this structure, the foam molded body is not deformed instantaneously but gradually deformed when the toothbrush is held during brushing, and a state of change in the degree to which the deformation can be temporarily maintained when the toothbrush is held immediately after the user has put his/her hand.
In one embodiment of the present application, the toothbrush may have the following structure: the soft resin has a loss tangent (loss elastic modulus/storage elastic modulus) of 0.05 or more.
According to this structure, the foam molded body deforms with an easy-to-hold force when holding the toothbrush, and the deformation speed is a moderate deformation speed that is too fast and not too slow, so that the toothbrush can be easily held by a user.
In one embodiment of the present application, the toothbrush may have the following structure: the soft resin has a shore a hardness of less than 30.
According to this structure, an excellent sense of fit can be obtained when the grip portion is gripped by a hand.
In one embodiment of the present application, the toothbrush may have the following structure: the mode of the size of the plurality of void portions is 0.001mm 2 Above, 0.3mm 2 The following ranges.
With this structure, an effect of obtaining appropriate flexibility of the foam molded body can be obtained.
In one embodiment of the present application, the toothbrush may have the following structure: the number of 80% of all the voids in the foam molding body is + -0.3 mm relative to the mode of the size of all the voids 2 Within a range of (2).
With this structure, the foam molded body can be provided with a more appropriate flexibility.
In one embodiment of the present application, the toothbrush may have the following structure: in a cross section of the foam molding intersecting the center line, an average value of the occupation ratios of the plurality of void portions is in a range of 2% to 60%.
According to this structure, the softness of the molded foam is improved, and the molded foam can be properly deformed when the toothbrush is held.
In one embodiment of the present application, the toothbrush may have the following structure: the density of the soft resin is 0.55g/cm 3 Above, 0.8g/cm 3 The following ranges.
According to this structure, the strength of the foam molded body can be ensured, and the flexibility can be obtained.
In one embodiment of the present application, the toothbrush may have the following structure: the cross section of the grip portion intersecting the center line is composed of the base member and the foam molding, and the ratio of the cross section area of the foam molding to the total area of the cross section area of the base member and the cross section area of the foam molding is less than 50%.
According to this structure, the sinking effect of the foam molded body by the plurality of void portions can be improved, and the flexibility of the grip portion can be improved, and the grip portion as a whole is not deformed due to the presence of the base member located inside the foam molded body, so that good operability of the toothbrush can be ensured.
In one embodiment of the present application, the toothbrush may have the following structure: the thickness of the foam molding is 2mm to 5 mm.
According to this structure, a moderate sinking effect by the plurality of void portions can be obtained, and thus an effect of improving the grasping property can be obtained.
In one embodiment of the present application, the toothbrush may have the following structure: the grip portion has a skin layer forming a surface of the grip portion and a foam layer in which the filling portion and the plurality of void portions are covered with the skin layer, and a ratio of a thickness of the skin layer to a thickness of the foam layer in a section intersecting the center line is 1:1 or more, 1: and 10 or less.
According to this structure, there is no risk of lowering the strength of the foam molded body, and the effect of improving the flexibility by the plurality of voids in the foam layer can be obtained.
In one embodiment of the present application, the toothbrush may have the following structure: the ratio of the foam molded body formed over the entire length of the grip portion is in the range of 50% to 100%.
According to this structure, when the grip portion is gripped by a hand during brushing, the foam molded body is provided in a region of half or more of the portion contacted by the hand, and the grip portion is easy to grip.
[ Effect of the application ]
According to the present application, a toothbrush which is not limited in design and can improve gripping properties can be provided.
Drawings
Fig. 1 is a front view showing a toothbrush according to an embodiment of the present application.
Fig. 2 is a sectional view taken along line II-II in fig. 1.
FIG. 3 is a diagram showing the size distribution of voids in a foam molding.
[ reference numerals ]
1 … toothbrush, 2 … toothbrush body, 3 … brush, 21 … grip, 21A … grip body, 22 … neck, 23 … head, 31 … tuft, 201 … base member, 202 … foam molded body, 202B … fill, 202c … void portion, 202A … foam layer, 202B … skin layer, G "… loss modulus, G' … storage modulus, O … centerline, tan delta … loss tangent
Detailed Description
Hereinafter, an embodiment of the toothbrush according to the present application will be described with reference to fig. 1 and 2.
The following embodiments are illustrative of one embodiment of the present application, and are not limited to the present application, and may be arbitrarily modified within the scope of the technical idea of the present application. In the following drawings, the actual structure and the scale, the number, and the like of the structures are different for easy understanding of the structures.
< toothbrush >
The toothbrush of the present application will be described with reference to the accompanying drawings.
Fig. 1 is a front view showing a toothbrush 1 according to an embodiment of the present application. Fig. 2 is a sectional view taken along line II-II in fig. 1.
As shown in fig. 1, a toothbrush 1 of the present embodiment is constituted by a toothbrush main body 2 and a brush section 3, and is formed in a long strip shape having a length along a center line O.
The toothbrush main body 2 has: the grip portion 21 having a length along the center line O, the neck portion 22 extending from the front end of the grip portion 21 along the center line O, and the head portion 23 provided on the side opposite to the grip portion 21 on the front end side of the neck portion 22. The toothbrush 1 may have the following structure: no neck 22 is provided between the grip portion 21 and the head portion 23.
The head 23 is formed in a substantially rectangular shape in a front view. The head 23 has a bristle surface 23a on the front side. A plurality of implantation holes 23b are formed in the implantation surface 23a. In the present embodiment shown in fig. 1, 26 implantation holes 23b are formed in the implantation surface 23a, but the number of implantation holes 23b is not limited to this.
In each of the implantation holes 23b, a substantially columnar bundle 31 of a plurality of bundles of bristles is implanted. The brush 3 is composed of a plurality of tufts 31 implanted in the implantation holes 23b.
Examples of bristles constituting the tuft 31 include straight bristles, bristles having a diameter gradually decreasing toward the distal end of the bristles (tapered bristles), distal-end bifurcated bristles, spiral bristles, and bristles having a special cross-section.
The tip shape of the tufts 31 may be flat cut, mountain cut, convex, concave, or the like.
The kind of bristles used and the shape of the distal end of the tuft 31 can be appropriately set in consideration of the cleaning effect required for the brush portion 3, the contact feeling with gums, and the like.
The neck 22 is disposed between the grip 21 and the head 23, and is a portion connecting the grip 21 and the head 23. The neck 22 of the present embodiment is formed as: extending from the head 23 toward the grip portion 21 by a predetermined width, and having a larger width at the rear end as it moves toward the grip portion 21.
The length and width of the neck 22 can be appropriately set according to the material and the like, and are set to a size that can improve the operability in the oral cavity and the accessibility to the molar teeth while securing the necessary strength as the neck 22.
The grip portion 21 is a portion gripped by a user and is formed in a long column shape. In order to ensure a sufficient length for the user to grasp the grip portion 21 for use, it is preferable to set the length from the position W to the rear end of the toothbrush 1 in the front view to, for example, 80mm to 140 mm. The grip portion 21 is connected to the rear end side of the neck portion 22 so as to describe a continuous smooth curve in its shape. In the present embodiment, the length from the position W1 shown in fig. 1 to the rear end of the toothbrush 1 is defined as the grip portion 21, but the range of the grip portion 21 is not limited thereto.
For example, the length from the position W2 where the center of curvature changes at the rear end side of the neck 22 to the rear end of the toothbrush 1 may be used as the grip portion 21.
In the toothbrush main body 2 having such a structure, the surface of the grip portion 21 to be gripped by a hand during brushing is made of a soft resin.
The toothbrush main body 2 includes: the base member 201 is made of a hard resin and the foam molded body 202 is made of a soft resin. The foam molding 202 is provided so as to cover a part of the base member 201 (a part corresponding to the grip portion 21). The toothbrush main body 2 has a smooth shape without a step at the boundary between the base member 201 and the foam molding 202.
The base member 201 has a head portion 23, a neck portion 22, and a grip main body 21A. The base member 201 may be manufactured by injection molding using a hard resin.
As a constituent material of the base member 201, polypropylene (PP) is preferable in view of high adhesion to a soft resin, for example. Examples of the resin include polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexamethylene terephthalate (PCT), polyacetal (POM), polyethylene naphthalate (PEN), polystyrene (PS), acrylonitrile/butadiene/styrene resin (ABS), cellulose Propionate (CP), polyarylate, polycarbonate, and acrylonitrile/styrene copolymer resin (AS). Among these resin materials, POM, PBT, PEN and other materials are preferably used because they have high strength and can easily thin the head 23. The resin may be used alone or in combination of 2 or more kinds.
The foam molding 202 is a porous body having a plurality of holes therein, and is provided so as to cover the entire surface of the grip body 21A on the rear end side of the neck portion 22 in the base member 201. The grip body 21A is formed in a cylindrical shape smaller than the width and thickness in the rear end of the neck 22 in a direction intersecting the center line O. The grip body 21A extends in the longitudinal direction with a constant diameter. The foam molding 202 is formed so as to fill the level difference 4 formed at the boundary position between the neck portion 22 and the grip portion 21 in the base member 201.
The grip portion main body 21A of the base member 201 is not limited to a cylindrical shape, and may be appropriately modified.
The foam molded body 202 has a foam layer 202A and a skin layer 202B formed on the outermost surface of the foam layer 202A. The foaming layer 202A has a filling portion 202b and a plurality of void portions 202c formed in the filling portion 202b. The foam layer 202A has an independent cell structure in which a plurality of void portions 202c are surrounded by the filling portions 202b, and the void portions 202c are not present in the skin layer 202b. Therefore, the outer peripheral surface of the skin layer 202B (the surface of the grip portion 21) is formed as a smooth curved surface.
As the soft resin constituting the foam molding 202, a resin softer than the hard resin used in the base member 201 may be used, and in the present embodiment, a resin having a shore a hardness of less than 30 may be used.
Specific examples of the soft resin constituting the foam molded body 202 include, for example, resins having a shore a hardness of less than 30 among elastomeric resins such as styrene-based and olefin-based resins. The shore a hardness of the soft resin constituting the foam molded body 202 is more preferably in the range of 0 to 25, and still more preferably in the range of 0 to 20. When the shore a hardness of the soft resin is equal to or less than the upper limit value, an excellent feel of fit can be obtained when the grip portion 21 is gripped by hand. When the shore a hardness is higher than the upper limit value, the foam molded body 202 is less likely to deform, and the feeling of fit of the opponent when holding the toothbrush 1 is reduced.
The Shore A hardness is hardness measured according to JIS K7215 or JIS K6253.
In the present embodiment, a styrene-based elastomer resin is preferably used in view of the ease of deformation and flexibility.
As the soft resin constituting the foam molded body 202, 1 kind may be used alone, or 2 or more kinds may be used in combination.
The storage elastic modulus G' (compression condition: temperature 23 ℃ C., frequency: 1 Hz) of the soft resin constituting the foam molded body 202 is preferably in the range of 104Pa to 106.5Pa, more preferably in the range of 105.5Pa to 106.5 Pa. This allows the elastic member to be appropriately deformed with a normal gripping force, and thus provides an effect of improving gripping ability of an opponent and facilitating brushing.
When the storage elastic modulus G' of the foam molding 202 is less than 104Pa, the foam molding 202 moves during brushing due to deformation with a weak force, and the grip performance is lowered, making it difficult to brush the teeth. In contrast, in the case where the storage elastic modulus G' of the foam molding 202 is greater than 106.5Pa, the foam molding 202 is not deformed if a strong force is not applied thereto. Therefore, the foam molded body 202 is less likely to deform by a normal gripping force, and thus the sense of fit at the time of gripping is reduced.
The loss elastic modulus g″ of the soft resin constituting the foam molded body 202 is preferably in the range of 104Pa to 106.5Pa, more preferably in the range of 104.5 to 105.5 Pa. Thus, when the toothbrush 1 is held during brushing, the foam molded body 202 is gradually deformed without being instantaneously deformed, and a state of change in the degree to which the deformation is temporarily held during holding immediately after the user has set his/her hands off can be obtained.
On the other hand, when the loss elastic modulus g″ of the foam molded body 202 is less than 104Pa, the deformation speed of the foam molded body 202 becomes high, and the foam molded body 202 is instantaneously deformed into a shape to be gripped by a user, so that the repulsive force of the foam molded body 202 cannot be immediately obtained at the time of gripping, and thus the grip is not good and difficult.
In contrast, when the loss elastic modulus g″ of the foam molded body 202 is greater than 106.5Pa, the deformation speed of the foam molded body 202 becomes slow, and it takes time until the foam molded body is deformed into a shape gripped by a user. Therefore, when the toothbrush is replaced, it takes time to change the shape of the toothbrush from the holding state before replacement to the non-holding shape until replacement. Since the deformation of the foam molded body 202 is difficult to recover, the following ability of the opponent is reduced, and the usability when the toothbrush is replaced during brushing is reduced.
The soft resin constituting the foam molded body 202 has a loss tangent tan δ (loss elastic modulus G "/storage elastic modulus G') in a range of 0.05 to 0.3. Thus, when the toothbrush 1 is held during brushing, the foam molded body 202 deforms with an easy-to-grasp force, and the deformation speed is also moderate, so that the user can easily grasp the toothbrush.
When the loss tangent tan δ of the soft resin is less than 0.05, the force required for normal brushing or more is required for deformation, and the resilience for recovery from deformation is also strong. On the other hand, since the deformation speed is also high, the following ability of the opponent is high, and therefore, if the hand is not pressed in frequently, the state of deformation is difficult to be maintained, and the holding is difficult.
When the loss tangent tan δ of the soft resin is larger than 0.3, the soft resin can be deformed with a weak force, but the deformation speed tends to be slow. Therefore, the shape following property of the hand during the brushing becomes slow, and the hand is difficult to hold.
The foam molded body 202 is formed of a foam resin obtained by mixing a foaming agent with a soft resin and foaming the mixture. The foaming agent is not particularly limited, and known chemical foaming agents and physical foaming agents can be used. Examples of the base polymer include Polyethylene (PE), polypropylene (PP), polystyrene (PS), acrylonitrile-butadiene-styrene (ABS), and ethylene-vinyl acetate (EVA). In the present embodiment, polyethylene is preferably used as the foaming agent from the viewpoint of compatibility with the elastomer resin.
Among the organic molecules, azodicarbonamide (ADCA), dinitroso pentamethylene tetramine (DNPT), azobisisobutyronitrile, barium azodicarbonate, p' -oxybisbenzenesulfonyl hydrazide (OBSH) and the like are exemplified as the foaming molecule. Among inorganic compounds, sodium bicarbonate, ammonium bicarbonate, sodium carbonate, ammonium carbonate, and the like are given as carbonate compounds. In the present embodiment, organic foaming molecules are preferably used in view of compatibility with the elastomer resin and foaming temperature.
In order to promote foaming of the soft resin, a foaming aid may be used together with the foaming agent. Examples of the foaming aid include urea and urea derivatives.
The amount of the foaming agent blended with respect to the soft resin is not particularly limited, and may be appropriately designed.
The foam molded body 202 is composed of a foam layer 202A formed of a foam resin and an unfoamed skin layer 202B. The foaming layer 202A has a filling portion 202b and a plurality of void portions 202c. In a cross section of the foam molding 202 in a direction intersecting the central axis, each void 202c exists independently within the filling portion 202b. The skin layer 202B is formed on the entire surface of the foamed layer 202A.
The mode size of the plurality of voids 202c in the foam molding 202 is preferably 0.001mm 2 Above, 0.3mm 2 Within the following range, more preferably within 0.01mm 2 Above, 0.1mm 2 The following ranges. This can provide an effect that the foam molded body 202 can have a proper flexibility.
Mode size in each void 202c is less than 0.001mm 2 In the case of (2), flexibility as the foam molded body 202 cannot be obtained. That is, since the amount of deformation of each void 202c becomes small, it is difficult to obtain the sinking effect of the resin accompanying the deformation of the void 202c. Therefore, the fit of the hand is reduced when holding the toothbrush 1.
On the other hand, the mode size in the void 202c is larger than 0.3mm 2 In the case of (2), the sinking effect cannot be obtained effectively when holding the toothbrush 1, and therefore the foam molded body 202 does not soften and the fitting property to the hand is lowered. That is, the upper and lower surfaces (surfaces facing each other in the direction in which the force is applied) of the void 202c are easily contacted, and the sinking effect of the resin due to the deformation of the void cannot be effectively obtained. Therefore, the fit of the hand is reduced when holding the toothbrush 1.
In addition, the mode size of 80% of the plurality of voids 202c in the foam molding 202 is preferably ±0.3mm 2 More preferably within a range of + -0.2 mm 2 Within a range of (2). This can provide an effect that the foam molded body 202 can be more moderately flexible.
When the amount is larger than the above range, the desired flexibility of the foam molded body 202 having uniformity cannot be obtained.
The foam molded body 202 can be molded by using a short shot (short shot) method, a full shot (full shot) method, a core back (core back) method, or the like of injection molding. In the present embodiment, injection molding is preferably performed by using a short shot method in order to foam the organic foaming molecules efficiently.
In the cross section of the foam molding 202 intersecting the center line O, the average value of the occupation ratios of the plurality of voids 202c is preferably in the range of 2% to 60%, and the upper limit is more preferably 50% or less. This improves the softness of the foam molded body 202, and enables the foam molded body 202 to be deformed appropriately when the toothbrush 1 is held.
When the occupation ratio of the plurality of voids 202c in the cross section of the foam molding 202 is reduced to less than 2%, the deformation amount of the foam molding 202 becomes small, and thus it is difficult to obtain flexibility. Conversely, when the above-mentioned occupation ratio is increased to more than 60%, the strength of the foam molded body 202 is lowered, or the individual foam of each void 202c cannot be maintained and the combined foam is increased, and the softness improvement effect is reduced.
The thickness of the foam molding 202 is preferably 2mm to 5 mm.
This can provide a moderate sinking effect due to the void 202c, and thus the gripping performance is improved.
When the thickness of the foam molded body 202 is less than 2mm, a proper sinking effect by the void 202c cannot be obtained, and the flexibility of the foam molded body 202 is lowered.
In contrast, when the thickness of the foam molding 202 is greater than 5mm, the foam molding 202 is excessively soft due to the very large sinking of the foam molding 202 when the grip portion 21 is gripped.
The density of the filling portion 202b in the foam molding 202 is preferably 0.55g/cm 3 Above, 0.8g/cm 3 The following ranges. This can provide the effect of ensuring the strength of the foam molded body 202 and achieving flexibility.
In the foam molding 202, the density in the filling portion 202b is less than 0.55g/cm 3 In the case of (2), the strength cannot be ensured. In contrast, the density at the filling portion 202b is greater than 0.8g/cm 3 In the case of (2), flexibility cannot be ensured.
The foam molded body 202 has a skin layer 202B and a foam layer 202A, and the ratio of the thicknesses thereof is preferably 1:1 or more, 1:10 or less, more preferably 1:5 or less. As a result, there is no risk of the strength of the foam molded body 202 decreasing, and the effect of improving the flexibility by the void 202c of the foam layer 202A can be obtained.
If the skin layer 202B is too thick relative to the foam layer 202A, the foam layer 202A having the void 202c is reduced, and thus the effect of improving the flexibility by the void 202c cannot be obtained.
Conversely, if the skin layer 202B becomes too thin relative to the foamed layer 202A, the void 202c approaches the skin layer 202B, and thus there is a risk that the void 202c exposes the surface. In this case, there is a concern that the strength of the foam molded body 202 is lowered or the appearance is poor.
The cross section of the grip portion 21 intersecting the center line O of the toothbrush 1 in the present embodiment is composed of the base member 201 and the foam compact 202, and the ratio of the cross section area of the foam compact 202 is preferably less than 50%, more preferably 20% to 40% with respect to the total area obtained by summing up the cross section area of the base member 201 and the cross section area of the foam compact 202. Accordingly, the sinking effect of the foam molding 202 by the void 202c is improved, the flexibility of the grip portion 21 can be improved, and the entire grip portion 21 is not deformed due to the base member 201 positioned inside the foam molding 202, so that good operability of the toothbrush 1 can be ensured.
When the ratio of the cross-sectional area of the foam molding 202 is smaller than 20%, the sinking effect of the foam molding 202 due to the void 202c is reduced, and the flexibility is reduced.
In contrast, when the ratio of the cross-sectional area of the foam molded body 202 is 50% or more and large, there is a concern about the strength as the toothbrush 1.
The ratio of forming the foam molded body 202 in the entire longitudinal direction of the grip portion 21 is preferably 50% or more and 100% or less, and the lower limit is more preferably 80% or more. Thus, when the grip portion 21 is gripped by a hand during brushing, the foam molded body 202 is provided in a region of half or more of the portion contacted by the hand, and the grip is easy.
If the ratio of the formed foam molded body 202 to the longitudinal direction of the grip portion 21 is small, the foam molded body 202 cannot be provided on the entire portion where the hand contacts when the grip portion 21 is gripped by the hand at the time of brushing, but the grip is made difficult by covering the boundary portion between the base member 201 formed of the hard resin and the foam molded body 202 by the hand. Therefore, it is preferable that the foam molded body 202 is present in substantially the entire region where the grip portion 21 is gripped by the hand as much as possible.
As described above, in the toothbrush 1 of the present embodiment, the foam molded body 202 is provided around the entire axis of the grip portion 21 to be gripped by the hand when the toothbrush 1 is gripped by the hand during brushing, by adopting a structure in which the entire axis of the grip portion main body 21A in the base member 201 made of a hard resin is covered with the foam molded body 202. Thus, regardless of the gripping method, the foam molded body 202 is deformed three-dimensionally and the contact area with the hand increases, so that the grip portion 21 is fitted to the thumb, index finger, and palm. Therefore, the grasping property with respect to the toothbrush 1 is improved, and the toothbrush 1 having a good grasping feeling can be obtained while facilitating brushing.
In the toothbrush 1 of the present embodiment, the base member 201 made of a hard resin is obtained by primary molding, and then secondary molding is performed using a soft resin, whereby the foam molded body 202 is formed to partially cover the surface of the base member 201. In this way, the toothbrush can be manufactured without restriction in design, and the design of the toothbrush 1 can be improved.
Examples (example)
The effects of the present application will be more clearly understood from the following examples. The present application is not limited to the following examples, and may be implemented with appropriate modifications within the scope of not changing the gist thereof.
Examples 1 to 16 and comparative examples 1 to 2
In this example, toothbrushes of examples 1 to 16 and comparative examples 1 to 2 were produced into the same samples as the toothbrushes shown in fig. 1 and 2 according to the specifications shown in tables 1, 2 and fig. 2 below.
The common specifications in examples 1 to 16 and comparative examples 1 to 2 are as follows.
Grip portion 21: full length 115mm, maximum width 14.5mm, maximum thickness 14.5mm
Base member 201: 110mm in length, 8.5mm in width and 8.5mm in thickness
Foam molding 202: maximum covering thickness 3mm
Dividing line (position w) between neck 22 and grip 21: width 11mm and thickness 11mm
Neck 22: length 45mm, minimum width 5mm, minimum thickness 5mm
Head 23: 25mm in length, 11mm in width and 4.5mm in thickness
The specifications of the toothbrushes in examples 1 to 10 are shown in tables 1 and 2, and the specifications of the toothbrushes in examples 11 to 16 and comparative examples 1 and 2 are shown in table 2.
As a constituent material of the handle body, PP resin is used.
The specifications of the samples of each example and comparative example are the storage elastic modulus, loss tangent, a hardness, mode of the size of the void portion, and the occupied ratio of the void, and are set for each sample.
Evaluation of storage elastic modulus "
As an apparatus for evaluating the storage elastic modulus, a dynamic viscoelasticity device (E4000) manufactured by UBM corporation was used.
As a method for evaluating the storage elastic modulus, a test piece (resin plate having a square of 10mm and a thickness of 6 mm) was fixed to the dynamic viscoelasticity device, and the storage elastic modulus and the loss elastic modulus at a frequency of 1Hz and a temperature of 23℃were measured as compression conditions, and the loss tangent was calculated.
Evaluation of void size "
Fig. 3 is a diagram showing the size distribution of the void 202c in the foam molding 202.
In fig. 3, the vertical axis represents the number of void portions 202c, and the horizontal axis represents the size of void portions 202c.
The cross section of the test piece was observed with a microscope, and the cross section of the void 202c was measured (n=40).
As shown in FIG. 3, the mode of the size of the void 202c is 0.01mm 2 ～0.1mm 2 . In addition, the average value is 0.025mm 2 。
TABLE 1
TABLE 2
[ evaluation method ]
(1) Ease of grip portion 21 (feel of fitting against an opponent) [ test method ]
By holding the toothbrush 1 by a 10-person monitor and performing brushing, the toothbrush 1 of each example was evaluated for "ease of gripping by the grip portion 21 (feeling of fitting by an opponent)".
The evaluation was defined as 7-scale absolute evaluations of 1 to 7 points. The average score of the 10 monitors was classified as a criterion described below, and the ease of gripping by the grip portion 21 was determined.
< criterion for determination >
Is equally divided into more than 6.6 minutes
The average score of the material is more than 5.5 and less than 6.5
Average score of 4.6 min or more and less than 5.5 min
The delta is that the average score is more than 3.6 and less than 4.5
X average score less than 3.5 minutes
(2) Deformation speed of the grip portion 21
[ test method ]
The toothbrush 1 was held by a 10-person monitor to brush teeth, and the toothbrush of each example was used to evaluate "deformation speed of the holding portion".
The evaluation was defined as 7-scale absolute evaluations of 1 to 7 points. The average score of 10 monitors was classified as a criterion to be described below, and the deformation speed (deformation condition) of the grip portion 21 was determined.
< criterion for determination >
Is equally divided into more than 6.6 minutes
The average score of the material is more than 5.5 and less than 6.5
Average score of 4.6 min or more and less than 5.5 min
The delta is that the average score is more than 3.6 and less than 4.5
X average score less than 3.5 minutes
(3) Ease of brushing
[ test method ]
The "ease of brushing" was evaluated by a 10-person monitor holding the toothbrush 1 for brushing teeth, and using the toothbrushes of the examples.
The evaluation was defined as 7-scale absolute evaluations of 1 to 7 points. The average score of the 10 monitors was classified as the following criterion, and the ease of brushing was determined.
< criterion for determination >
Is equally divided into more than 6.6 minutes
The average score of the material is more than 5.5 and less than 6.5
Average score of 4.6 min or more and less than 5.5 min
The delta is that the average score is more than 3.6 and less than 4.5
X average score less than 3.5 minutes
As shown in [ table 1] and [ table 2], good results were obtained for all of "ease of gripping by the grip portion 21 (feeling of adhesion to the hand)", "deformation of the grip portion 21", and "ease of brushing" of the samples of examples 1 to 16 in which the value of the "storage elastic modulus G' (Log 10)" was in the range of 4.0 to 6.5.
In contrast, for the samples of comparative example 1 having a value of "storage elastic modulus G' (Log 10)" of less than 4.0 and comparative example 2 having a value of more than 6.5, good results were obtained regarding "ease of grip (feeling of adhesion to an opponent)" of the grip portion 21 and "ease of brushing.
As shown in tables 1 and 2, good results were obtained for all of "ease of gripping by the grip portion 21 (feeling of adhesion to the hand)", "deformation of the grip portion 21", and "ease of brushing" of the samples of examples 5 to 16 in which the value of the "loss elastic modulus G" (Log 10) was in the range of 4.0 to 6.5.
As shown in tables 1 and 2, particularly good results were obtained for all of the samples of examples 10, 11, 15, and 16 in which the storage elastic modulus G' (Log 10), the loss elastic modulus G "(Log 10), the loss tangent tan δ (Log 10), and the hardness of the foam molded body 202 were within the following ranges, with respect to" ease of gripping by the grip portion 21 (feel of the hand) "," deformation of the grip portion 21 ", and" ease of brushing.
In the samples of examples 10, 11, 15 and 16, the mode of the size of the void 202c in the foam molded body 202 was 0.01mm 2 Above, 0.1mm 2 In the following ranges, example 15 gave the best results.
The sample specification of example 15 can be said to be the best mode.
While the preferred embodiments of the present application have been described above with reference to the drawings, the present application is not limited to these examples. The shapes, combinations, and the like of the respective constituent members shown in the above examples are examples, and various modifications can be made according to design requirements and the like within the scope not departing from the gist of the present application.
Claims (12)
1. A toothbrush is characterized in that,
the toothbrush comprises a toothbrush main body and a brush part, wherein the toothbrush main body is provided with a holding part with a length along a central line, a neck part extending from the front end of the holding part and a head part arranged on one side of the neck part opposite to the holding part, the brush part is formed by a plurality of hair bundles planted in the head part,
the toothbrush main body has:
a base member having a grip main body, the neck portion, and the head portion, and formed of a hard resin; and
an expanded molded body formed of a soft resin and provided on the surface of the grip body,
the foam molding has a filling portion and a plurality of void portions,
the storage elastic modulus G' of the foam molded body is 104Pa or more and 106.5Pa or less.
2. The toothbrush according to claim 1, wherein the foam molding has a loss elastic modulus G "of 104Pa or more and 106.5Pa or less.
3. The toothbrush according to claim 1 or 2, wherein the soft resin has a loss tangent, i.e., loss elastic modulus G "+storage elastic modulus G', of 0.05 or more.
4. The toothbrush according to any one of claims 1 to 3 wherein the soft resin has a shore a hardness of less than 30.
5. The toothbrush according to any one of claims 1 to 4 wherein a mode of a dimension of the plurality of void portions is 0.001mm 2 Above, 0.3mm 2 The following ranges.
6. The toothbrush according to any one of claims 1 to 5 wherein the number of 80% of all the voids in the foam molded body is ±0.3mm with respect to the mode of the size of all the voids 2 Within a range of (2).
7. The toothbrush according to any one of claims 1 to 6, wherein an average value of the occupation ratios of the plurality of void portions in a cross section of the foam molding intersecting the center line is in a range of 2% to 60%.
8. The toothbrush according to any one of claims 1 to 7 wherein the soft resin has a density of 0.55g/cm 3 Above, 0.8g/cm 3 The following ranges.
9. The toothbrush according to any one of claims 1 to 8, wherein,
the cross section of the grip part intersecting the center line is composed of the base member and the foam molded body,
the ratio of the cross-sectional area of the molded foam to the total area of the cross-sectional area of the base member and the cross-sectional area of the molded foam is less than 50%.
10. The toothbrush according to claim 7, wherein the foam molded body has a thickness of 2mm or more and 5mm or less.
11. The toothbrush according to any one of claims 1 to 10, wherein,
the grip portion has:
a skin layer forming a surface of the grip portion; and
a foaming layer in which the filling portion and the plurality of void portions are covered with the skin layer,
the ratio of the thickness of the skin layer to the foamed layer in a section intersecting the center line is 1:1 or more, 1: and 10 or less.
12. The toothbrush according to any one of claims 1 to 11, wherein,
the ratio of the foam molded body formed over the entire length of the grip portion is in the range of 50% to 100%.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020-214656 | 2020-12-24 | ||
| JP2020214656 | 2020-12-24 | ||
| PCT/JP2021/043085 WO2022137961A1 (en) | 2020-12-24 | 2021-11-24 | Toothbrush |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116634905A true CN116634905A (en) | 2023-08-22 |
Family
ID=82157643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202180086422.3A Pending CN116634905A (en) | 2020-12-24 | 2021-11-24 | Toothbrush with tooth brush |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPWO2022137961A1 (en) |
| KR (1) | KR20230135039A (en) |
| CN (1) | CN116634905A (en) |
| WO (1) | WO2022137961A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5877538U (en) * | 1981-11-20 | 1983-05-25 | ライオン株式会社 | toothbrush |
| JP2005287940A (en) * | 2004-04-02 | 2005-10-20 | Lion Corp | Toothbrush |
| JP5638928B2 (en) * | 2010-12-07 | 2014-12-10 | 株式会社カネカ | Polypropylene resin for injection foam molding and injection foam molded body thereof |
| JP6512703B2 (en) | 2015-06-10 | 2019-05-15 | ライオン株式会社 | toothbrush |
| KR20180021668A (en) | 2015-06-24 | 2018-03-05 | 라이온 가부시키가이샤 | toothbrush |
-
2021
- 2021-11-24 KR KR1020237003407A patent/KR20230135039A/en unknown
- 2021-11-24 CN CN202180086422.3A patent/CN116634905A/en active Pending
- 2021-11-24 WO PCT/JP2021/043085 patent/WO2022137961A1/en active Application Filing
- 2021-11-24 JP JP2022571993A patent/JPWO2022137961A1/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2022137961A1 (en) | 2022-06-30 |
| KR20230135039A (en) | 2023-09-22 |
| WO2022137961A1 (en) | 2022-06-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1063907B1 (en) | Flexible tip toothbrush handle | |
| TWI539912B (en) | Toothbrush | |
| CN101309614B (en) | Oral care implement | |
| CN101031220B (en) | Oral care implement | |
| CN108697230B (en) | Tooth brush | |
| KR102183121B1 (en) | Toothbrush | |
| CN116634905A (en) | Toothbrush with tooth brush | |
| JP7433310B2 (en) | toothbrush | |
| CN218528013U (en) | Tooth brush | |
| JP2018094007A (en) | toothbrush | |
| KR20080031335A (en) | Razor handle provided with improved grip | |
| JP2020000778A (en) | Interdental cleaning tool | |
| CN216875408U (en) | Tooth brush | |
| CN216984001U (en) | Tooth brush | |
| WO2018110299A1 (en) | Toothbrush and method for manufacturing toothbrush | |
| JP7272620B2 (en) | hair growth stimulator | |
| CN111093430B (en) | Tooth brush | |
| JP2023029268A (en) | toothbrush | |
| JP6842905B2 (en) | Toothbrush and how to make a toothbrush | |
| JP2022104256A (en) | Application brush |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |