JP4558384B2 - toothbrush - Google Patents

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Publication number
JP4558384B2
JP4558384B2 JP2004177100A JP2004177100A JP4558384B2 JP 4558384 B2 JP4558384 B2 JP 4558384B2 JP 2004177100 A JP2004177100 A JP 2004177100A JP 2004177100 A JP2004177100 A JP 2004177100A JP 4558384 B2 JP4558384 B2 JP 4558384B2
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Prior art keywords
covering
toothbrush
gripping
grip
core material
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JP2006000202A (en
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栄一 関野
孝夫 加藤
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Lion Corp
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Lion Corp
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Priority to JP2004177100A priority Critical patent/JP4558384B2/en
Priority to CNB2005800193272A priority patent/CN100482123C/en
Priority to PCT/JP2005/010802 priority patent/WO2005122827A1/en
Priority to KR1020067026150A priority patent/KR101215092B1/en
Publication of JP2006000202A publication Critical patent/JP2006000202A/en
Priority to HK07110137.6A priority patent/HK1102173A1/en
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Publication of JP4558384B2 publication Critical patent/JP4558384B2/en
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    • 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
    • A46B5/026—Grips or handles having a nonslip section
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B15/00—Other brushes; Brushes with additional arrangements
    • A46B15/0085—Brushes provided with an identification, marking device or design
    • 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
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D3/00—Preparing, i.e. Manufacturing brush bodies
    • A46D3/005—Preparing, i.e. Manufacturing brush bodies by moulding or casting a body around bristles or tufts of bristles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1676—Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F23/00—Advertising on or in specific articles, e.g. ashtrays, letter-boxes
    • G09F23/0081—Advertising on or in specific articles, e.g. ashtrays, letter-boxes on sanitary articles, e.g. on cakes of soap
    • G09F23/0082—Advertising on or in specific articles, e.g. ashtrays, letter-boxes on sanitary articles, e.g. on cakes of soap on tooth brushes
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/42—Brushes
    • B29L2031/425—Toothbrush

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Epidemiology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Brushes (AREA)

Description

本発明は、歯ブラシの把持部の改良技術に係り、把持部にソフトエラストマー材料などの特別な軟質樹脂材料を用いることにより握りやすくフイット性に優れ、滑り難い構成とした技術に関する。   The present invention relates to a technology for improving a gripping portion of a toothbrush, and relates to a technology that is easy to grip and has a good fit property and a non-slip structure by using a special soft resin material such as a soft elastomer material for the gripping portion.

通常、歯ブラシのハンドル部は硬質の熱可塑性樹脂から構成されているが、握ったとき滑りやすく、フィット性が低いという問題がある。このため、把持部に熱可塑性エラストマーなどからなる軟質材料を被覆し、握ったときのフィット性と滑り防止性を両立させようとした構成の歯ブラシが種々提案されている。   Normally, the handle portion of the toothbrush is made of a hard thermoplastic resin, but there is a problem that it is slippery when gripped and has a low fit. For this reason, various types of toothbrushes have been proposed in which the gripping portion is covered with a soft material such as a thermoplastic elastomer so as to achieve both fit and grip resistance when gripped.

このような背景から従来の歯ブラシの一例として、ハンドル把持部の背面側に細長い空洞と把持要素を有し、把持要素の内側に剛性を付与する少なくとも１つのフランジを形成し、把持要素が熱可塑性の弾性材料からなり、指によって変形可能な構成とした歯ブラシハンドルが提供されている。（特許文献１参照）
他の歯ブラシの一例として、硬質材料と軟質材料からなる歯ブラシハンドルにおいてハンドルの表面側を硬質材料から構成し、ハンドルの背面と側面を軟質材料で形成し、ブラッシング時に硬質材料部が歯肉に当たらないようにして、歯肉を傷つけたりするのを防ぐことを目的とした歯ブラシハンドルが提供されている。（特許文献２参照） From such a background, as an example of a conventional toothbrush, an elongated cavity and a gripping element are formed on the back side of the handle gripping portion, and at least one flange for imparting rigidity is formed inside the gripping element, and the gripping element is thermoplastic. There is provided a toothbrush handle made of an elastic material and deformable by a finger. (See Patent Document 1)
As an example of another toothbrush, in the toothbrush handle made of a hard material and a soft material, the surface side of the handle is made of a hard material, and the back and sides of the handle are made of a soft material so that the hard material portion does not hit the gum during brushing Thus, a toothbrush handle intended to prevent damaging the gums is provided. (See Patent Document 2)

他の歯ブラシの一例として、硬質の軸材と軟質の外装材がインサート成形により一体成形された構成（特許文献３参照）、硬質合成樹脂製の１次ハンドルの握り部の外周部に軟質合成樹脂を射出質成形し、握り部の全周面を軟質合成樹脂で覆った構成の歯ブラシハンドル（特許文献４参照）が知られている。
また、他の歯ブラシの一例として、ハンドル部を透明な飽和ポリエステル系樹脂のハンドル基台とハンドル把持部の幅方向両側面にゴム硬度が５５〜９５の範囲であるポリエステル系熱可塑性エラストマーを被覆した構成とされ、意匠性と操作性を向上させた構成の歯ブラシ（特許文献５参照）が知られている。
特表２０００−５０４６０９号公報 実開昭５９−１２３４３２号公報 特開平２−７１７１０号公報 特開２００２−３４６５９号公報 特開２００３−２６５２３２号公報 As an example of other toothbrushes, a structure in which a hard shaft material and a soft exterior material are integrally formed by insert molding (see Patent Document 3), a soft synthetic resin on the outer periphery of a grip portion of a primary handle made of hard synthetic resin There is known a toothbrush handle (see Patent Document 4) having a structure in which an injection quality molding is performed and the entire peripheral surface of the grip portion is covered with a soft synthetic resin.
Moreover, as an example of another toothbrush, the handle portion is coated with a polyester thermoplastic elastomer having a rubber hardness in the range of 55 to 95 on both the width direction side surfaces of the handle base of the transparent saturated polyester resin and the handle gripping portion. There is known a toothbrush (see Patent Document 5) having a configuration and improved design and operability.
JP 2000-504609 Gazette Japanese Utility Model Publication No.59-123432 JP-A-2-71710 JP 2002-34659 A JP 2003-265232 A

先の特許文献１に記載された歯ブラシでは、ソフト感はあるがハンドル把持部背面側だけに弾性材料を設けたものであるため、ハンドルを握ったときのフィット性と滑り防止性が不十分で、特にハンドル背面側の反対側の面を握るときのフィット性と滑り防止性が低いという問題があった。
先の特許文献２に記載された歯ブラシでは、ハンドルの背面側と側面側に設けた軟質材料は、ブラッシング時に硬質樹脂部が歯肉に当たることを防止し、歯肉を傷つけたりするのを防ぐものではあるが、この軟質材料はハンドルのフィット性や滑り防止性を目的としたものではなかった。 In the toothbrush described in the above-mentioned patent document 1, although there is a soft feeling, an elastic material is provided only on the back side of the handle gripping portion, so that the fit and anti-slip properties when gripping the handle are insufficient. In particular, there was a problem of low fit and slip resistance when gripping the opposite side of the handle back side.
In the toothbrush described in Patent Document 2, the soft material provided on the back side and the side of the handle prevents the hard resin portion from hitting the gums during brushing and prevents the gums from being damaged. However, this soft material was not intended for handle fitting or slip prevention.

特許文献３に記載された歯ブラシの構造では、把持部背面側のみに軟質材を設けたもので、ハンドル背面側の反対の面を握るときのフィット性に難があり、滑り防止性が低いという問題があった。
特許文献４に記載された歯ブラシの構造では、軟質合成樹脂の厚みは１ｍｍ前後と極めて薄いためにフィット性に難があり、また、滑り防止性についてさらに研究の余地があった。
特許文献５に記載された歯ブラシの構造では、ゴム硬度が５５〜９５であって、硬いためにフィット性が低く、また、把持部側面のみにエラストマー部を設けたものであるため滑り防止性が低いという欠点があった。 In the structure of the toothbrush described in Patent Document 3, a soft material is provided only on the back side of the gripping part, there is difficulty in fit when gripping the opposite surface on the back side of the handle, and slip resistance is low. There was a problem.
In the toothbrush structure described in Patent Document 4, the thickness of the soft synthetic resin is as thin as about 1 mm, which makes it difficult to fit, and there is room for further research on anti-slip properties.
In the structure of the toothbrush described in Patent Document 5, the rubber hardness is 55 to 95 and the fit is low because it is hard, and the anti-slip property is provided because the elastomer part is provided only on the side surface of the grip part. There was a drawback of being low.

また、一般に歯ブラシのブラッシングにおける使用性を向上するためには、フィット性や滑り防止性に優れるハンドル状の把持部とすることが重要である。そこで、ハンドル状の把持部を硬質材料の芯材と軟質材料の被覆材とで構成し、軟質材料の被覆材としてはエラストマー樹脂が一般的に使用されている。しかし、エラストマー樹脂の摩擦係数が低い場合、また、把持部における被覆面積が広くない場合に、把持部の滑り防止性がよくないという問題があった。さらに、エラストマー樹脂の硬度が硬い場合、また、把持部における被覆材の厚みが薄い場合は、歯ブラシとしてのフィット性が良好ではないという問題があった。   In general, in order to improve the usability in brushing of a toothbrush, it is important to use a handle-like gripping part that is excellent in fit and slip resistance. In view of this, the handle-shaped gripping portion is constituted by a hard material core material and a soft material coating material, and an elastomer resin is generally used as the soft material coating material. However, when the friction coefficient of the elastomer resin is low, and when the covering area of the gripping portion is not large, there is a problem that the slip prevention property of the gripping portion is not good. Furthermore, when the hardness of the elastomer resin is hard, and when the thickness of the covering material at the grip portion is thin, there is a problem that the fitting property as a toothbrush is not good.

本発明者らは前記課題を解決するために、いずれの方向からであっても把持部を握った際のフィット性に優れ、把持部のいずれの方向に対しても滑り防止性に優れた歯ブラシの提供を目的とする。また、本発明は、フィット性に優れ、滑り防止性に優れるとともに、被覆部が汚れ難い歯ブラシを提供することを目的とする。   In order to solve the above problems, the present inventors have a toothbrush that has excellent fit when gripping the gripping part from any direction and is excellent in slip resistance in any direction of the gripping part. The purpose is to provide Another object of the present invention is to provide a toothbrush that is excellent in fit, excellent in anti-slip properties, and has a coating part that is hardly soiled.

上記目的を達成するために、本発明は以下の構成を採用した。
本発明の歯ブラシにあっては、毛束が植設されたヘッド部と、首部と、把持部を有し、前記把持部が、熱可塑性樹脂からなる芯材部と、該芯材部に接して芯材部の周面に被着され、この芯材部よりも軟質のエラストマー樹脂からなる被覆部とを具備してなり、前記被覆部が前記把持部の表面の７０％以上を覆い、前記芯材部の表面側に前記被覆部を介して視認可能なロゴレリーフ用の複数の表示突部を形成し、これら表示突部の上の前記被覆部の厚みを０．５〜２．０ｍｍの範囲として前記被覆部を介する前記表示突部の透視表示を可能とし、前記被覆部の表面の摩擦係数を１以上とし、前記被覆部表面積の５０％以上にシボ加工を施してなり、前記被覆部のゴム硬度を１５〜４０の範囲、前記被覆部の厚みを２〜５ｍｍとし、前記シボ加工の粗さ（Ｒａ）を１０〜２００μｍの範囲としたことを特徴とする。 In order to achieve the above object, the present invention employs the following configuration.
In the toothbrush of the present invention, the toothbrush has a head portion in which hair bundles are implanted, a neck portion, and a gripping portion, and the gripping portion is in contact with the core portion made of a thermoplastic resin. And a covering portion made of an elastomer resin that is softer than the core portion, and the covering portion covers 70% or more of the surface of the gripping portion, A plurality of display protrusions for logo relief that can be visually recognized through the covering portion are formed on the surface side of the core portion, and the thickness of the covering portion on the display protrusion is 0.5 to 2.0 mm. Perspective display of the display protrusion through the covering portion is possible as a range, the friction coefficient of the surface of the covering portion is 1 or more, and embossing is applied to 50% or more of the surface area of the covering portion, The rubber hardness is in the range of 15 to 40, and the thickness of the covering portion is 2 to 5 mm. Roughness (Ra) of, characterized in that in the range of 10 to 200 [mu] m.

本発明の歯ブラシは、毛束が植設されたヘッド部と、首部と、把持部を有し、前記把持部が、熱可塑性樹脂からなる芯材部と、該芯材部に接して芯材部の周面に被着され、この芯材部よりも軟質のエラストマー樹脂からなる被覆部とを具備してなり、前記被覆部が前記把持部の表面の７０％以上を覆い、前記把持部の前記首部側先端近傍の背面側、および、前記把持部において前記首部側と反対側の後端側近傍の植毛面部側及び背面側、前記把持部中央において前記植毛面側の表面側に、個々に前記芯材部から外方側に突出する凸部が形成され、これら凸部において前記被覆部から外部に露出している部分の合計面積が前記把持部の面積の１０％以下とされてなり、前記把持部において前記首部側と反対側の後端側近傍の植毛面部側の凸部と、前記把持部中央において前記植毛面側の表面側の凸部との間に、前記芯材部の表面側に前記被覆部を介して視認可能なロゴレリーフ用の複数の表示突部が形成され、これら表示突部の上の前記被覆部の厚みを０．５〜２．０ｍｍの範囲として前記被覆部を介する前記表示突部の透視表示が可能とされ、前記被覆部の表面の摩擦係数を１以上とし、前記被覆部表面積の５０％以上にシボ加工を施してなり、前記被覆部のゴム硬度を１５〜４０の範囲、前記被覆部の厚みを２〜５ｍｍとし、前記シボ加工の粗さ（Ｒａ）を１０〜２００μｍの範囲としたことを特徴とする。
前記歯ブラシは、前記被覆部をスチレン系エラストマー樹脂から形成し、前記被覆部で前記把持部の表面の９０％以上を覆い、前記被覆部表面の摩擦係数を２．０以上とし、前記被覆部の厚みを２〜３ｍｍの範囲とすることができる。

The toothbrush of the present invention has a head part in which a bunch of hair is implanted, a neck part, and a grip part, and the grip part is in contact with the core part and a core material part made of thermoplastic resin. A covering portion made of an elastomer resin that is softer than the core material portion, the covering portion covering 70% or more of the surface of the gripping portion, The back side near the neck side front end, and the flocked surface side and back side near the rear end side opposite to the neck side in the gripping part, individually on the flocking surface side surface side in the center of the gripping part, Convex portions protruding outward from the core material portion are formed, and the total area of the portions exposed to the outside from the covering portion in these convex portions is 10% or less of the area of the gripping portion, A convex portion on the flocked surface portion side in the vicinity of the rear end side opposite to the neck portion side in the grip portion; Wherein the gripping portion central between the convex portion of the surface of the flocked surface, a plurality of display projections for visible logo relief through the cover portion on the surface side of the core portion is formed, The display protrusions can be seen through through the covering part by setting the thickness of the covering part on the display protrusions in the range of 0.5 to 2.0 mm, and the friction coefficient of the surface of the covering part is 1 With the above, 50% or more of the surface area of the covering part is subjected to a graining process, the rubber hardness of the coating part is in the range of 15 to 40, the thickness of the coating part is 2 to 5 mm, and the roughness of the graining process ( Ra) is in the range of 10 to 200 μm.
In the toothbrush, the covering portion is formed of a styrene-based elastomer resin, and the covering portion covers 90% or more of the surface of the gripping portion, the coefficient of friction of the covering portion surface is 2.0 or more, The thickness can be in the range of 2-3 mm.

請求項１に記載の発明によれば、軟質樹脂材料のエラストマー樹脂からなる被覆部が芯材部の周面を覆ったのでいずれの方向から把持した場合であっても良好なグリップ性を有し、被覆部表面の摩擦係数を１以上としたので把持した場合に滑り難い歯ブラシを提供できる効果がある。
請求項１に記載の本発明によれば、芯材部を熱可塑性樹脂から形成することで全体として歯みがき時に適度な剛性を発揮でき、被覆部をエラストマー樹脂から構成することで把持しやすく、被覆部表面の５０％以上をシボ加工することで、エラストマー樹脂の被覆部に特有のベタツキ感を抑制することができ、把持し易く、フィット感に優れた歯ブラシを提供できる効果がある。
請求項１に記載の本発明において、エラストマー樹脂の被覆部の表面積５０％以上にシボ加工を施し、被覆部の摩擦係数を１以上、ゴム硬度を１５〜４０とし、被覆部表面のシボ加工の粗さ（Ｒａ）を１０〜２００μｍの範囲とすることでベタツキ感がなく、汚れが付き難いとともに、芯材部との密着性に優れ、フィット感が良好で滑り止め性の良好な歯ブラシを製造時の良好な成形性を具備しつつ提供できる。
請求項１に記載の発明において、エラストマー樹脂の被覆部の厚みを２〜５ｍｍの好適な範囲としたので、把持部を握った場合に適度な弾力感を得ることができ、把持しやすいとともに、被覆部の厚みを過剰に厚くしないので太くなりすぎることのない、持ち易い歯ブラシを提供できる。
請求項１に記載の発明において、芯材部の表面側に被覆部を介して透視表示により視認可能なロゴレリーフ用の表示突部あるいは被覆部から露出する表示突部を形成しておくことで、表示突部によりロゴレリーフ、商品名の表示ができる。
そして、表示突部の上に被覆部を設ける構成においてエラストマー樹脂の被覆部の厚みを０．５〜２．０ｍｍの範囲とすることにより、前記表示突部の透過表示が可能となる。 According to the first aspect of the present invention, since the covering portion made of the elastomer resin of the soft resin material covers the peripheral surface of the core portion, it has a good grip property even when gripped from any direction. Since the friction coefficient of the surface of the covering portion is 1 or more, there is an effect that it is possible to provide a toothbrush that is difficult to slip when gripped.
According to the first aspect of the present invention, the core portion can be formed from a thermoplastic resin so that appropriate rigidity can be exhibited when brushed as a whole, and the covering portion can be easily grasped by being made of an elastomer resin. By embossing 50% or more of the surface of the part, it is possible to suppress a sticky feeling peculiar to the coated part of the elastomer resin, and to provide a toothbrush that is easy to grip and has an excellent fit.
In the present invention according to claim 1, the surface area of the coating portion of the elastomer resin is 50% or more, the friction coefficient of the coating portion is 1 or more, the rubber hardness is 15-40, Produces a toothbrush that has a roughness (Ra) in the range of 10 to 200 μm, has no stickiness, is difficult to get dirty, has excellent adhesion to the core, has a good fit, and has a good anti-slip property. It can be provided while having good moldability at the time.
In the invention according to claim 1, since the thickness of the coating portion of the elastomer resin is in a suitable range of 2 to 5 mm, it is possible to obtain an appropriate elasticity when gripping the grip portion, and it is easy to grip, Since the thickness of the covering portion is not excessively increased, an easy-to-hold toothbrush that does not become too thick can be provided.
In the invention according to claim 1, by forming a display protrusion for logo relief or a display protrusion exposed from the cover through the cover on the surface side of the core member, which can be visually recognized through a perspective display. The logo relief and product name can be displayed by the display protrusion.
And in the structure which provides a coating | coated part on a display protrusion, the transmissive display of the said display protrusion is attained by making thickness of the coating | coated part of elastomer resin into the range of 0.5-2.0 mm.

請求項２に記載の発明によれば、芯材部に設けた凸部についてエラストマー樹脂の被覆部から露出する部分の合計面積を１０％以下とすると、芯材部を被覆部で十分に覆うことができるので、把持部を把持した場合に芯材部と手との接触面積を十分に小さくできる結果として滑り防止性を得ることができ、ブラッシング時に扱い易いという効果がある。
請求項２に記載の本発明において、エラストマー樹脂の被覆部の表面積５０％以上にシボ加工を施し、被覆部の摩擦係数を１以上、ゴム硬度を１５〜４０とし、被覆部表面のシボ加工の粗さ（Ｒａ）を１０〜２００μｍの範囲とすることでベタツキ感がなく、汚れが付き難いとともに、芯材部との密着性に優れ、フィット感が良好で滑り止め性の良好な歯ブラシを製造時の良好な成形性を具備しつつ提供できる。
請求項２に記載の発明によれば、熱可塑性樹脂の芯材部の表面側と裏面側に離間して被覆部の表面に露出する凸部を設けることで、軟質樹脂材料のエラストマー樹脂からなる被覆部が芯材部に対してずれようとしても熱可塑性樹脂の凸部がこれを抑制するので凸部が軟質のエラストマー樹脂の被覆部のずれ止め効果を奏する。これら熱可塑性樹脂の凸部を芯材部表裏面の長さ方向に複数設けておくことで、エラストマー樹脂の被覆部の効果的なずれ止めを実現できる。また、把持部の表面側の凸部の近くにロゴレリーフ用の表示突部周りのエラストマー樹脂があるので、このロゴレリーフ用の表示突部周りのエラストマー樹脂の被覆部のずれ止め効果を奏する。
請求項３に記載の発明によれば、被覆部をスチレン系エラストマー樹脂から形成し、前記被覆部で把持部の表面の９０％以上を覆い、前記被覆部表面の摩擦係数を２．０以上とし、前記被覆部の厚みを２〜３ｍｍの範囲とすることにより、滑り防止性に優れ、フィット性に優れ、把持部が滑り難く、ベタツキ性を感じ難く、製造時の成形性にも優れるという種々の特性を使用者に具体的に実感させ得る歯ブラシを提供できる効果がある。 According to invention of Claim 2, if the total area of the part exposed from the coating part of elastomer resin is made into 10% or less about the convex part provided in the core material part, the core material part is sufficiently covered with the coating part. Therefore, when the grip portion is gripped, the contact area between the core portion and the hand can be sufficiently reduced. As a result, anti-slip property can be obtained, and there is an effect that it is easy to handle during brushing.
In the present invention according to claim 2, the surface area of the coating portion of the elastomer resin is 50% or more, the friction coefficient of the coating portion is 1 or more, the rubber hardness is 15-40, Produces a toothbrush that has a roughness (Ra) in the range of 10 to 200 μm, has no stickiness, is difficult to get dirty, has excellent adhesion to the core, has a good fit, and has a good anti-slip property. It can be provided while having good moldability at the time.
According to invention of Claim 2, it consists of elastomer resin of a soft resin material by providing the convex part which is spaced apart in the surface side and back surface side of the core part of a thermoplastic resin, and is exposed to the surface of a coating | coated part. Even if the covering portion tends to shift with respect to the core material portion, the convex portion of the thermoplastic resin suppresses this, so that the convex portion has an effect of preventing the covering portion of the soft elastomer resin from shifting. By providing a plurality of convex portions of these thermoplastic resins in the length direction of the front and back surfaces of the core portion, it is possible to effectively prevent the elastomer resin coating portion from shifting. Further, since there is an elastomer resin around the display protrusion for logo relief near the convex portion on the surface side of the gripping portion, there is an effect of preventing displacement of the coating portion of the elastomer resin around the display protrusion for logo relief.
According to the invention of claim 3, the covering portion is formed from a styrene-based elastomer resin, and the covering portion covers 90% or more of the surface of the gripping portion, and the friction coefficient of the surface of the covering portion is 2.0 or more. By making the thickness of the covering portion in the range of 2 to 3 mm, various anti-slip properties, excellent fit properties, grip portions are difficult to slip, stickiness is difficult to feel, and moldability during manufacture is also excellent. There is an effect that it is possible to provide a toothbrush that can make the user feel the above characteristics.

以下、本発明の実施の形態を図面を用いて説明する。
図１と図２は本発明に係る歯ブラシの第１実施形態を示すもので、この形態の歯ブラシＡは、毛束１が植設されたヘッド部２と、首部３と、把持部４を有し、前記把持部４が、硬質樹脂材料からなる芯材部５と、該芯材部５に接して芯材部５のほぼ全周に被着された軟質樹脂材料からなる被覆部６とを具備して構成され、前記被覆部６が前記把持部４の表面の７０％以上を覆うとともに、前記被覆部６の表面の摩擦係数を１以上として構成されている。
前記ヘッド部２と首部３に比べて把持部４は図１（Ｂ）の側面図と図１（Ｃ）の断面図に示すようにその厚さ方向に太く形成され、図１（Ａ）の平面図と図１（Ｄ）の裏面図に示すように把持部４の幅方向にも太く形成されている。これは把持部４における芯材部５の周囲に被覆部６が被着されていることによる。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2 show a first embodiment of a toothbrush according to the present invention. A toothbrush A of this embodiment has a head portion 2 in which a hair bundle 1 is implanted, a neck portion 3, and a grip portion 4. The grip portion 4 includes a core material portion 5 made of a hard resin material, and a covering portion 6 made of a soft resin material that is in contact with the core material portion 5 and is applied to almost the entire circumference of the core material portion 5. The covering portion 6 covers 70% or more of the surface of the grip portion 4, and the friction coefficient of the surface of the covering portion 6 is 1 or more.
As shown in the side view of FIG. 1B and the cross-sectional view of FIG. 1C, the grip portion 4 is formed thicker in the thickness direction than the head portion 2 and the neck portion 3, and is shown in FIG. As shown in the plan view and the back view of FIG. 1D, the grip portion 4 is also formed thick in the width direction. This is because the covering portion 6 is attached around the core portion 5 in the grip portion 4.

この形態の歯ブラシＡにおいて首部３はそのヘッド部２側よりも把持部４側が若干太くなるような形状とされ、更に芯材部５は、図２（Ａ）の平面図と図２（Ｄ）の裏面図に示すようにそれらの幅方向において首部３の最も細い部分よりも若干太く首部３の最も太い部分よりも若干細い横幅を有し、図２（Ｂ）の側面図と図２（Ｃ）の断面図に示す如くそれらの厚さ方向において首部３の太い部分と同程度の厚さに形成され、芯材部５は図１（Ｃ）の断面図または図２（Ｂ）の側面図に示すように若干上側に凸状に反るようにカーブして握りやすいように形成されている。
次に前記芯材部５の裏面側において首部３に近い部分である先端部側中央に裏面視楕円型の凸部５Ａが形成され、芯材部５の裏面側の後端部側中央にも裏面視楕円型の凸部５Ｂが形成されている。前記芯材部５の表面側においてその長さ方向中央部側に平面視楕円型の凸部５Ｃが形成され、芯材部５の表面側においてその後端部側に平面視楕円型の凸部５Ｄが先の凸部５Ｂと対応する位置に形成されている。また、前記芯材部５の表面側において凸部５Ｃと凸部５Ｄの間の部分には商品名表示用（ロゴレリーフ用）の複数の表示突部５Ｅが形成されている。 In the toothbrush A of this form, the neck portion 3 is shaped so that the grip portion 4 side is slightly thicker than the head portion 2 side, and the core member portion 5 is a plan view of FIG. 2 (A) and FIG. 2 (D). As shown in the rear view of FIG. 2B, the lateral width of FIG. 2B is slightly larger than the narrowest portion of the neck portion 3 and slightly narrower than the thickest portion of the neck portion 3 in the width direction. ) In the thickness direction as shown in the cross-sectional view of FIG. 1 (C), the core portion 5 is formed to have the same thickness as that of the thick portion of the neck portion 3. As shown in FIG. 2, the curve is formed so as to be slightly convex upward and to be easily gripped.
Next, on the back side of the core part 5, an elliptical convex part 5 </ b> A as viewed from the back is formed at the front end side center which is a part close to the neck part 3, and the back end side center of the back side of the core part 5 A convex portion 5B having an elliptical shape when viewed from the back is formed. On the surface side of the core member 5, an elliptical convex portion 5C in plan view is formed on the center in the length direction, and on the surface side of the core member 5, the convex portion 5D in plan view on the rear end side. Is formed at a position corresponding to the convex portion 5B. A plurality of display protrusions 5E for displaying the product name (for logo relief) are formed on the surface side of the core member 5 between the protrusions 5C and 5D.

次に前記芯材部５の外部側には、図１（Ａ）〜（Ｄ）に示すように芯材部５の周囲４面のいずれの面においても適度な厚みでもって芯材部５を取り囲む軟質樹脂材料からなる被覆部６が形成されている。この被覆部６は先の芯材部５の各突部５Ａ〜５Ｄの上面を覆わないようにこれら各突部５Ａ〜５Ｄの周面を覆う程度の厚みに形成されている。   Next, as shown in FIGS. 1A to 1D, the core material portion 5 is provided on the outer side of the core material portion 5 with an appropriate thickness on any of the four surrounding surfaces of the core material portion 5. A covering portion 6 made of a surrounding soft resin material is formed. The covering 6 is formed to a thickness that covers the peripheral surfaces of the protrusions 5A to 5D so as not to cover the upper surfaces of the protrusions 5A to 5D of the core member 5.

前記ヘッド部２と首部３と芯材部５は、熱可塑性樹脂などの硬質樹脂材料により１次金型で一体成形されたもので、例えばその材質としては、ポリプロピレン樹脂やポリエステル樹脂が使用できるが、強度、成形性、コストの点からポリプロピレン樹脂が最も好ましい。
前記被覆部６は軟質樹脂材料により２次金型で前記芯材部５の外周部に一体成形されたもので、例えばその材質としては、スチレン系エラストマー樹脂やオレフィン系エラストマー樹脂やポリエステル系エラストマー樹脂が使用できるが、柔軟性、滑り防止性、芯材との接着性の点からスチレン系エラストマー樹脂が最も好ましい。
前記スチレン系エラストマー樹脂として具体的には、例えば、ドイツ・クライブルグ社の商品名「サーモラスト」三菱化学（株）の商品名「ラバロン」、クラレ（株）の商品名「セプトン」、理研ビニル（株）の商品名「レオストマー」、旭化成（株）の商品名「タフテック」などが使用できる。 The head part 2, the neck part 3 and the core part 5 are integrally molded with a primary mold of a hard resin material such as a thermoplastic resin. For example, a polypropylene resin or a polyester resin can be used as the material. In view of strength, moldability and cost, polypropylene resin is most preferable.
The covering portion 6 is integrally molded on the outer peripheral portion of the core portion 5 with a secondary mold made of a soft resin material. Examples of the material include a styrene elastomer resin, an olefin elastomer resin, and a polyester elastomer resin. However, styrenic elastomer resins are most preferable from the viewpoints of flexibility, anti-slip properties, and adhesion to the core material.
Specific examples of the styrene-based elastomer resin include, for example, the product name “Thermolast” of Kleburg, Germany, the product name “Lavalon” of Mitsubishi Chemical Corporation, the product name “Septon” of Kuraray Co., Ltd., Riken Vinyl ( The product name “Reostomer” of Asahi Kasei Co., Ltd. and the product name “Tough Tech” of Asahi Kasei Co., Ltd. can be used.

前記歯ブラシＡにおいてハンドル部となる把持部４において被覆材６の摩擦係数が１（ＪＩＳ Ｋ７１２５によるアルミまたはステンレスの金属板に対する摩擦係数）以上、より好ましくは２以上であるとき、滑り防止性の良好なハンドル部とすることができる。ここで被覆部６の摩擦係数が１未満の場合、歯ブラシＡを用いるブラッシング時に十分な滑り防止性を得ることができない。
前記被覆部６により、前記把持部４の表面積の７０％以上、より好ましくは９０％以上を被覆成形することにより、滑り防止性の良好な把持部４とすることができる。把持部４の表面積の７０％未満を被覆部６で被覆するのでは、把持部４を手で把持したとき被覆材６の部分と手との接触面積が少ないために、ブラッシング時十分な滑り防止性を得ることができない。
前記スチレン系エラストマー樹脂の被覆部６に有機または無機の顔料を添加し、適宜着色して成形してもよく、また添加しないナチュラル色で成形してもよく、その場合、芯材部５の表示突部５Ｅが被覆部６ごしに半透明に透けて見える美観の優れた歯ブラシＡを得ることができる。ここで表示突部５Ｅの表面に被覆される被覆部６の厚みは、その内側の表示突部５Ｅを外部から肉眼で見る場合に文字等の表示突部５Ｅのロゴを視認し易いようにすることが必要であり、そのためにはこの表示突部５Ｅ部分の上の被覆部６の厚みを０.５〜２.０ｍｍ程度とすることが好ましい。ここで被覆部６の厚みを０.５ｍｍ未満とすると、金型で成形する場合に金型の成形キャビティ（金型面と１次成型品の表示突部５いとの隙間）に樹脂が入り込まずに成形不良となるおそれが高くなり、逆に、表示突部５Ｅ上の被覆部６が２ｍｍ以上の厚みとなると外部から表示突部５Ｅが認識できなくなるので好ましくない。 In the toothbrush A, when the gripping part 4 serving as the handle part has a friction coefficient of the covering material 6 of 1 (friction coefficient against an aluminum or stainless steel metal plate according to JIS K7125) or more, more preferably 2 or more, anti-slip property is good. The handle portion can be made. Here, when the friction coefficient of the covering portion 6 is less than 1, sufficient anti-slip properties cannot be obtained during brushing using the toothbrush A.
By covering and forming 70% or more, more preferably 90% or more, of the surface area of the gripping portion 4 with the covering portion 6, the gripping portion 4 having good anti-slip properties can be obtained. Covering less than 70% of the surface area of the gripping portion 4 with the covering portion 6 is sufficient to prevent slipping during brushing because the contact area between the portion of the covering material 6 and the hand is small when the gripping portion 4 is gripped by hand. I can't get sex.
An organic or inorganic pigment may be added to the styrene-based elastomer resin coating 6 and may be appropriately colored and molded, or may be molded in a natural color not added. A toothbrush A having an aesthetic appearance in which the protrusion 5E can be seen translucently through the covering portion 6 can be obtained. Here, the thickness of the covering portion 6 covered on the surface of the display protrusion 5E makes it easy to visually recognize the logo of the display protrusion 5E such as characters when the inside display protrusion 5E is viewed with the naked eye. For this purpose, it is preferable to set the thickness of the covering portion 6 on the display projection 5E to about 0.5 to 2.0 mm. Here, if the thickness of the covering portion 6 is less than 0.5 mm, the resin does not enter the molding cavity (the gap between the mold surface and the display projection 5 of the primary molded product) when molding with a mold. In contrast, when the covering portion 6 on the display protrusion 5E has a thickness of 2 mm or more, the display protrusion 5E cannot be recognized from the outside, which is not preferable.

前記構成の歯ブラシＡの心材部５（硬質材料の芯材部）を成形する場合、一般の射出成形機と金型を１次金型として用いて成形することができる。また、２次金型によるスチレン系エラストマー樹脂の被覆部６を成形する場合、一般の射出成形機を用いて成形できるるが、金型はホットランナー・バルブゲート方式またはピンゲート方式を使用することができ、中でもホットランナー・バルブゲート方式が適する。
前記歯ブラシＡの把持部４は滑り防止性を高めるため、被覆部６の表面に凹凸やリブを設けてもよく、表面にシボ加工を施してもよい。前記把持部４は被覆部６のゴム硬度が１５〜４０のスチレン系エラストマー樹脂がフィット性の点で適する。ここでゴム硬度が１５未満では、把持部を握ったとき手のベタツキ感が強く、汚れがつきやすい。また、ゴム硬度が１５未満では、芯材部５との接着性が低く、芯材部５から剥がれやすいため適さない。ゴム硬度が４０以上の場合、把持部を握ったとき被覆部６が硬くなり、フィット感が得られない。また、滑り防止性も低くなるため適さない。
前記把持部４において、被覆部６の厚みを２〜５ｍｍの範囲で成形するのがフィット性の点で適する。厚みが２ｍｍ以下では、把持部４を握ったとき被覆部６が硬く感じられ、フィット感が低く好ましくない。被覆部６の厚みが５ｍｍ以上では、把持部が太くなり過ぎて手で持ち難くなるため好ましくない。 When molding the core part 5 (hard core part) of the toothbrush A having the above-described configuration, it can be molded using a general injection molding machine and a mold as a primary mold. In addition, when molding the styrene elastomer resin coating 6 with a secondary mold, it can be molded using a general injection molding machine, but the mold may use a hot runner valve gate system or a pin gate system. Among them, the hot runner / valve gate method is suitable.
In order to improve the slip prevention property, the gripping portion 4 of the toothbrush A may be provided with unevenness or ribs on the surface of the covering portion 6, or may be subjected to embossing on the surface. For the grip portion 4, a styrene elastomer resin having a rubber hardness of 15 to 40 of the covering portion 6 is suitable in terms of fit. Here, if the rubber hardness is less than 15, the stickiness of the hand is strong when the gripping part is gripped, and dirt is easily attached. On the other hand, if the rubber hardness is less than 15, the adhesiveness to the core material portion 5 is low, and it is easy to peel off from the core material portion 5, which is not suitable. When the rubber hardness is 40 or more, the covering portion 6 becomes hard when the grip portion is gripped, and a fit cannot be obtained. Moreover, it is not suitable because the anti-slip property is lowered.
In the grip part 4, it is suitable from the point of fit that the thickness of the covering part 6 is formed in the range of 2 to 5 mm. When the thickness is 2 mm or less, the covering portion 6 is felt hard when the grip portion 4 is gripped, and the fit feeling is low, which is not preferable. If the thickness of the covering portion 6 is 5 mm or more, the grip portion becomes too thick and is difficult to hold by hand.

前記歯ブラシＡにおける把持部４の凸部５Ａ〜５Ｄ、計４ヶ所で芯材部５の凸部を露出させ、かつ、芯材部５の露出面積を把持部４の表面積の１０％以下に制限することにより高い把持部４の滑り防止性を得る。
前記把持部４の後端部側近傍の上下面と、把持部中央の植毛面側の計３ヶ所で芯材の凸部５Ｂ、５Ｃ、５Ｄが露出し、かつ、芯材部５の露出面積を把持部４の表面積の１０％以下に制限することにより高い把持部の滑り防止性を得ることができる。
また、摩擦係数が高いエラストマー樹脂を被覆部６の構成材料として使用する場合、滑り防止性は優れるが、ハンドルを握ったときベタツキやすくなるため、被覆材の表面にシボ加工を施すことにより改善される。シボ加工は被覆材の全面、もしくは、被覆材表面の５０％以上に設けるのが望ましい。５０％未満の場合、シボ加工によるベタツキ防止効果が低い。被覆材のゴム硬度が１５〜４０の場合、ベタツキ性と成形性の点から、シボ加工の粗さはＲa＝１０〜２００μの範囲が好ましく、Ｒａ＝１０μ未満ではベタツキがあり、Ｒａ＝２００μ以上では成形性が悪くなる。 In the toothbrush A, the convex portions 5A to 5D of the grip portion 4 are exposed at a total of four locations, and the exposed area of the core portion 5 is limited to 10% or less of the surface area of the grip portion 4. By doing so, a high slip prevention property of the grip portion 4 is obtained.
The convex portions 5B, 5C, and 5D of the core material are exposed at a total of three locations on the upper and lower surfaces in the vicinity of the rear end portion side of the grip portion 4 and the flocked surface side in the center of the grip portion, and the exposed area of the core material portion 5 is exposed. By restricting the surface area to 10% or less of the surface area of the grip portion 4, high slip prevention performance of the grip portion can be obtained.
In addition, when an elastomer resin having a high coefficient of friction is used as the constituent material of the covering portion 6, the anti-slip property is excellent, but it becomes easy to stick when the handle is gripped. The The embossing is desirably provided on the entire surface of the coating material or 50% or more of the surface of the coating material. If it is less than 50%, the anti-sticking effect by embossing is low. When the rubber hardness of the coating material is 15 to 40, from the viewpoint of stickiness and moldability, the roughness of the embossing process is preferably in the range of Ra = 10 to 200 [mu], and when Ra is less than 10 [mu], there is stickiness, and Ra = 200 [mu] or more. Then, moldability deteriorates.

以上の如く構成された歯ブラシＡであるならば、適度なフィット性と滑り防止性を具備し、握りやすく、使用感の良好なものを提供できる。また、エラストマー樹脂の被覆部６に特有のベタツキ感を抑制することができ、把持し易く、フィット感に優れ、ブラッシング時に良好に扱うことができる歯ブラシＡを提供できる。   If it is toothbrush A comprised as mentioned above, it has moderate fitting property and slip prevention property, can be easily gripped, and can provide a good feeling of use. Further, it is possible to provide a toothbrush A that can suppress a sticky feeling peculiar to the coating portion 6 of the elastomer resin, is easy to grip, has a good fit, and can be handled well during brushing.

ところで、この形態の歯ブラシＡにおいて、毛束１は例えば毛束を構成する用毛として合成樹脂用毛を用い、該合成樹脂用毛の断面積を直径０.１０２ｍｍ（４ｍｉ１）以下の円形断面用毛の断面積相当とすることができる。また、前記毛束の植設される植毛穴を直径１．８ｍｍ以上の円形植毛穴の穴断面積に相当する大きさとし、植毛穴密度を４５％以上、用毛充填率を７０〜９５％とすることができる。
先の植毛穴に植毛される用毛は直径０.１５２ｍｍ（６ｍｉ１）以下の合成樹脂用毛が好ましく、さらには直径０.１０２〜０.１２７ｍｍ（４〜５ｍｉ１）の範囲が好ましい。また、用毛は異なる直径の用毛を組み合わせても良く、例えば４ｍｉｌと５ｍｉｌの用毛を組み合わせて植毛しても良い。
０.１２７ｍｍ（６ｍｉ１）より太いと、ソフトな歯周病ケア歯ブラシとしては不向きな傾向となるぱかりでなく、狭い隙問の清掃力が低下する。直径０.１２７ｍｍ（５ｍｉ１）以下の合成樹脂用毛を用いて毛束を構成すると、ソフトで当り心地がやさしく、かつ、弱い刷撮圧でも口腔内の隅々まで高い窟垢除去力を発揮することができるようになる。
用毛材質は、従来から歯ブラシに用いられている合成樹脂であれぱ使用可能であり、ナイロンのようなポリアミド、ポリブチレンテレフタレート、ポリエチレンテレフタレート、ポリトリメチレンテレフタレートのようなポリエステル、またはポリプロピレンなどがある。それらのブレンド樹脂などでもよい。コスト抑制のためには、ナイロンなどの合成樹脂毛を採用し、各毛束は単一径の用毛によって構成すればよい。 By the way, in the toothbrush A of this form, the bristles 1 use, for example, synthetic resin bristles as the bristles constituting the bristles, and the cross-sectional area of the synthetic resin bristles is for a circular cross section having a diameter of 0.102 mm (4 mi1) or less. It can be equivalent to the cross-sectional area of the hair. Further, the flock hole to be implanted with the hair bundle has a size corresponding to the hole cross-sectional area of a circular flock hole having a diameter of 1.8 mm or more, the flock hole density is 45% or more, and the hair filling rate is 70 to 95%. can do.
The hair to be planted in the previous planting hole is preferably a synthetic resin hair having a diameter of 0.152 mm (6 mi1) or less, and more preferably in the range of 0.102 to 0.127 mm (4 to 5 mi1). Further, the hair may be a combination of different diameters, for example, a 4 mil and a 5 mil hair may be combined.
If it is thicker than 0.127 mm (6 mi1), it does not tend to be unsuitable as a soft periodontal disease toothbrush, and the cleaning power for narrow gaps is reduced. When the hair bundle is composed of synthetic resin bristles with a diameter of 0.127 mm (5 mi1) or less, it is soft and comfortable to touch, and exhibits high cavern removal ability to every corner of the oral cavity even with weak printing pressure. Will be able to.
The hair material can be any synthetic resin conventionally used for toothbrushes, such as polyamide such as nylon, polybutylene terephthalate, polyethylene terephthalate, polyester such as polytrimethylene terephthalate, or polypropylene. . Those blended resins may be used. In order to reduce the cost, synthetic resin hair such as nylon may be employed, and each hair bundle may be composed of single diameter hair.

図３と図４は本発明に係る歯ブラシの第２実施形態を示すもので、この形態の歯ブラシＢは、毛束１が植設されたヘッド部２と、首部３と、把持部４を有し、前記把持部４が、硬質樹脂材料からなる芯材部５と、該芯材部５に接して芯材部５のほぼ全周に被着された軟質樹脂材料からなる被覆部６とを具備して構成され、前記被覆部６が前記把持部４の表面の７０％以上を覆うとともに、前記被覆部６の表面の摩擦係数を１以上として構成されているという基本構成については、先の第１実施形態の歯ブラシＡと同等の構造とされている。
この第２実施形態の歯ブラシＢは先の第１実施形態の歯ブラシＡと基本的に同等の構造を有するが、異なっているのは、歯ブラシＡにおいて設けられていた凸部５Ａ、５Ｃが省略され、第１実施形態の構造では凸部５Ａ、５Ｃが形成されていた部分が図３（Ｃ）に示すようにスチレン系エラストマー樹脂の被覆部６で覆われるとともに、第１実施形態の構造では商品名表示用（ロゴレリーフ用）の複数の表示突部５Ｅが形成されていた部分に、同じく商品名表示用の若干背の高い表示突部５Ｅ２が形成され、この表示突部５Ｅ２の先端部がスチレン系エラストマー樹脂の被覆部６の表面側に露出されて視認し易くなっている点が異なっている。
この第２実施形態の歯ブラシＢはその他の構成は先の第１実施形態の歯ブラシＡと同等であるので、先の第１実施形態の歯ブラシＡと同等の効果を得ることができる。 3 and 4 show a second embodiment of the toothbrush according to the present invention. The toothbrush B of this embodiment has a head portion 2 in which the hair bundle 1 is implanted, a neck portion 3, and a grip portion 4. The grip portion 4 includes a core material portion 5 made of a hard resin material, and a covering portion 6 made of a soft resin material that is in contact with the core material portion 5 and is applied to almost the entire circumference of the core material portion 5. The basic structure that the covering portion 6 covers 70% or more of the surface of the gripping portion 4 and the friction coefficient of the surface of the covering portion 6 is 1 or more is described above. It is set as the structure equivalent to the toothbrush A of 1st Embodiment.
The toothbrush B of the second embodiment has basically the same structure as the toothbrush A of the first embodiment except that the convex portions 5A and 5C provided in the toothbrush A are omitted. In the structure of the first embodiment, the portions where the protrusions 5A and 5C are formed are covered with a styrene elastomer resin coating 6 as shown in FIG. A slightly tall display projection 5E 2 for displaying a product name is also formed in the portion where the plurality of display projections 5E for name display (for logo relief) are formed, and the tip of the display projection 5E 2 The difference is that the portion is exposed to the surface side of the covering portion 6 of the styrene elastomer resin and is easily visible.
Since the other configuration of the toothbrush B of the second embodiment is the same as that of the toothbrush A of the first embodiment, the same effect as that of the toothbrush A of the first embodiment can be obtained.

「試験例１」
１次金型にポリプロピレン樹脂の射出を行って図２に示す構成のヘッド部と、首部とそれに連続する把持部の芯材部からなる１次成形体を成形し、次いで、２次金型に１次金型で成形した１次成形体を装填し、１次成形体の芯材部の外周側にスチレン系エラストマー樹脂からなる被覆材を成形して一体化し、２色成形による歯ブラシを製造した。また、一体化した後にハンドル部のヘッド部に合成樹脂フィラメントを植毛して歯ブラシを得た。
この工程に基づいて歯ブラシを製造する際、スチレン系エラストマー樹脂のゴム硬度として２０のものを使い、それら個々の厚みを３ｍｍとし、表面の摩擦係数を０.５、１.０、２.０の３種類、表面積を５０％、７０％、９０％の３種類に設定して各種の歯ブラシ試料を製造し、それぞれの試料について実際に手に握ってみた場合のフィット性について試験した。その結果を以下の表１に示す。
表１の実験条件は、持ち方：パームグリップ、評価方法：官能評価、評価基準：◎印：ブラッシング時、ハンドルが非常に滑りにくいもの、○印：ブラッシング時、ハンドルが滑りにくいもの、△印：ブラッシング時、ハンドルがやや滑りやすいもの、×印：ブラッシング時、ハンドルが滑りやすいもの、という基準で評価した。 “Test Example 1”
The primary mold is formed by injecting polypropylene resin into the primary mold to form a primary molded body composed of the head portion configured as shown in FIG. 2, the neck portion, and the core material portion of the gripping portion continuous thereto, and then into the secondary die. A primary molded body molded with a primary mold was loaded, and a covering material made of a styrenic elastomer resin was molded and integrated on the outer peripheral side of the core portion of the primary molded body to produce a two-color molded toothbrush. . Further, after integration, a synthetic resin filament was planted in the head portion of the handle portion to obtain a toothbrush.
When producing a toothbrush based on this process, 20 rubber hardnesses of styrene-based elastomer resin are used, the thickness of each of them is 3 mm, and the friction coefficient of the surface is 0.5, 1.0, 2.0. Various types of toothbrush samples were manufactured by setting three types and three types of surface areas of 50%, 70%, and 90%, and each sample was tested for fit when actually grasped by hand. The results are shown in Table 1 below.
The experimental conditions in Table 1 are: how to hold: palm grip, evaluation method: sensory evaluation, evaluation criteria: ◎: the handle is very slippery when brushing, ○: the handle is difficult to slip when brushing, Δ : Evaluation was made based on the criteria that the handle was slightly slippery during brushing, x mark: the handle was slippery when brushing.

Figure 0004558384
Figure 0004558384

表１に示す結果から、ハンドル部となる把持部の被覆材の摩擦係数が１以上（ＪＩＳ Ｋ７１２５によるアルミまたはステンレスの金属板に対する摩擦係数１に相当する値以上）、より好ましくは２以上であるとき、滑り防止性の良好なハンドルとなることが分かる。また、摩擦係数が１未満の場合、ブラッシング時に十分な滑り防止性を得ることはできないことが判明した。
更に、ハンドル把持部の表面積の７０％以上、より好ましくは９０％以上をスチレン系エラストマー樹脂で被覆成形することにより、滑り防止性の良好な把持部となることが分かった。また、把持部表面積の７０％未満の被覆率では、把持部を把持したとき被覆材部分と手との接触面積が少ないため、ブラッシング時に十分な滑り防止性を得ることができなかった。
これらの試験結果から、把持部の表面積の７０％以上にスチレン系エラストマー樹脂の被覆材を被覆することが必要であり、かつ、その摩擦係数は１.０以上であることが好ましいことが判明した。 From the results shown in Table 1, the friction coefficient of the covering material of the gripping part which becomes the handle part is 1 or more (a value corresponding to the friction coefficient 1 for an aluminum or stainless steel metal plate according to JIS K7125), more preferably 2 or more. It can be seen that the handle has a good anti-slip property. Further, it was found that when the friction coefficient is less than 1, sufficient anti-slip property cannot be obtained during brushing.
Furthermore, it was found that 70% or more, more preferably 90% or more, of the surface area of the handle gripping part is formed by coating with a styrene elastomer resin to provide a gripping part with good anti-slip properties. In addition, when the covering ratio is less than 70% of the surface area of the gripping part, when the gripping part is gripped, the contact area between the covering material part and the hand is small.
From these test results, it was found that 70% or more of the surface area of the gripping part needs to be coated with a coating material of styrene-based elastomer resin, and the coefficient of friction is preferably 1.0 or more. .

「試験例２」
次に先の試験例１で用いた被覆率９０％の構造を採用し、スチレン系エラストマー樹脂のゴム硬度を１５、４０、６０の３種類とし、厚みを１、２、３ｍｍの３種類として各歯ブラシ試料を作成し、それぞれの試料について実際に握ってみた場合のフィット性について試験した。その結果を以下の表２に示す。
表２の実験条件は、持ち方：パームグリップ、評価方法：官能評価：評価基準：◎印：ハンドル把持部が手に非常にフィットする、○印：ハンドル把持部が手にフィットする、△印：ハンドル把持部が手にあまりフィットしない、×印：ハンドル把持部が手に全くフィットしない、という基準で評価した。 "Test Example 2"
Next, the structure of 90% coverage used in the previous test example 1 is adopted, the rubber hardness of the styrene-based elastomer resin is set to three types of 15, 40, and 60, and the thickness is set to three types of 1, 2, and 3 mm. Toothbrush samples were prepared and tested for fit when each sample was actually gripped. The results are shown in Table 2 below.
The experimental conditions in Table 2 are: Holding method: Palm grip, Evaluation method: Sensory evaluation: Evaluation criteria: ◎ mark: Handle gripping part fits the hand very much, ○ mark: Handle gripping part fits the hand, △ mark : Evaluation was made based on the criteria that the handle gripping part does not fit the hand very much, x mark: the handle gripping part does not fit the hand at all.

Figure 0004558384
Figure 0004558384

表２に示す結果から、ハンドル部としての把持部は被覆材のゴム硬度が１５〜４０のスチレン系エラストマー樹脂がフィット性の点で適すること、ゴム硬度が１５未満では、把持部を握ったとき手のベタツキ感が強く、汚れがつきやすいこと、ゴム硬度が１５未満では、芯材との接着性が低く剥がれやすいため適さないこと、ゴム硬度が４０以上の場合、把持部を握ったとき被覆材が硬くフィット感が得られないこと、更に滑り防止性も低くなるため適さないことが判明した。
また、ハンドル部としての把持部は被覆材の厚みが２〜５ｍｍで成形するのがフィット性の点で適することが判明した。即ち、厚みが２ｍｍ以下では、把持部を握ったとき被覆材が硬くフィット感が低く好ましくないこと、厚みが５ｍｍ以上では、把持部が太くなり過ぎ、持ちにくいため好ましくないことが判明した。
これらの試験結果から、ゴム硬度が１５〜４０の範囲であって、その厚みが２〜５ｍｍの範囲が歯ブラシ用として好ましいことが判明した。 From the results shown in Table 2, when the gripping part as the handle part is gripping the gripping part, a styrene-based elastomer resin having a rubber hardness of 15 to 40 is suitable in terms of fit, and when the rubber hardness is less than 15, Strong hand stickiness, easy to get dirty, rubber hardness less than 15 is not suitable because it has low adhesion to core material and easily peels off, and when rubber hardness is 40 or more, it covers when gripping the grip It was found that the material is hard and a fit cannot be obtained, and that the anti-slip property is also low, which is not suitable.
Moreover, it turned out that it is suitable from the point of fit property to shape | mold the grip part as a handle | steering-piece with the thickness of a coating | covering material 2-5 mm. That is, it was found that when the thickness is 2 mm or less, the covering material is hard and has a low fit when gripping the grip portion, and when the thickness is 5 mm or more, the grip portion becomes too thick and difficult to hold.
From these test results, it was found that the rubber hardness is in the range of 15 to 40 and the thickness is in the range of 2 to 5 mm for the toothbrush.

「試験例３」
本発明に係わるヘッド部、首部、把持部とを有する歯ブラシハンドルにおいて、把持部を硬質材料の芯材と軟質材料の被覆材とから構成し、芯材をポリプロピレン樹脂から形成し、被覆材の摩擦係数を２、被覆材をゴム硬度２０のスチレン系エラストマー樹脂から形成し、先のスチレン系エラストマー樹脂により把持部表面の約９０％を平均厚み＝３ｍｍにて被覆した歯ブラシと、被覆材の摩擦係数を０．２、被覆材としてゴム硬度６０のオレフィン系エラストマー樹脂を用い、把持部表面の約９０％を平均厚み＝１ｍｍにて被覆した構造の歯ブラシ（比較品：特開２０００−２６５２３２号公報に記載の歯ブラシ相当品）で使用テストを実施した。その結果を以下の表３に示す。
以下の表３において、パネル数（テスト数）：ｎ＝３０、テスト期間：２週間、７段階絶対評価（非常によい：７点、よい：６点、ややよい：５点、どちらともいえない：４点、ややよくない：３点、かなりよくない：２点、非常によくない：１点）の基準で示している。 “Test Example 3”
In a toothbrush handle having a head portion, a neck portion, and a gripping portion according to the present invention, the gripping portion is composed of a hard material core material and a soft material coating material, the core material is formed from polypropylene resin, and the friction of the coating material The coefficient of friction is 2 and the friction coefficient of the coating material is a toothbrush in which the coating material is formed from a styrene elastomer resin with a rubber hardness of 20 and about 90% of the gripping part surface is coated with an average thickness = 3 mm with the styrene elastomer resin. 0.2, a toothbrush having a structure in which an olefin-based elastomer resin having a rubber hardness of 60 is used as a covering material and about 90% of the gripping part surface is covered with an average thickness = 1 mm (Comparative product: Japanese Patent Laid-Open No. 2000-265232 A use test was carried out with the toothbrush equivalent) described. The results are shown in Table 3 below.
In Table 3 below, the number of panels (number of tests): n = 30, test period: 2 weeks, 7-level absolute evaluation (very good: 7 points, good: 6 points, somewhat good: 5 points, neither can be said. : 4 points, slightly bad: 3 points, quite bad: 2 points, very bad: 1 point).

Figure 0004558384
Figure 0004558384

表３に示す使用テストの結果、本発明品は比較品より、滑り防止性が高く、フィット性も格段に向上し、使用性の優れる歯ブラシであることが確認された。   As a result of the use test shown in Table 3, it was confirmed that the product of the present invention is a toothbrush having a higher anti-slip property, a significantly improved fit, and an excellent usability than the comparative product.

「試験例４」
次に、被覆部を構成するスチレン系エラストマー樹脂において、摩擦係数が高いエラストマーを使用すると滑り性は優れるが、把持部を握った場合に手に伝わる感触としてのベタツキ性が問題となる。そこで、このベタツキ性の試験を行うために、スチレン系エラストマー樹脂の表面に形成するシボ加工の有無によるベタツキ性評価試験を行った。
評価試験はスチレン系エラストマー樹脂のゴム硬度１５、４０、摩擦係数１.０のものを用い、平均厚み３ｍｍとして、その表面に形成するシボの平均荒さ（Ｒａ）を１０μｍ未満とした試料、１０〜２００μｍの範囲とした試料、２００μｍを超える大きさとした試料で個々にベタツキ状態と成形性について評価した。その結果を以下の表４に示す。
以下の表４においてベタツキ○印の試料は把持部を把持した際にベタツキを感じない試料、×印の試料はベタツキを感じた試料、成形性において○印は問題なく成形できた試料であり、×印は金型からの離型性の面で成形性に支障を生じた試料を示す。 “Test Example 4”
Next, in the styrene elastomer resin constituting the covering portion, when an elastomer having a high friction coefficient is used, the slipperiness is excellent, but the stickiness as a touch transmitted to the hand when the grip portion is gripped becomes a problem. Therefore, in order to perform this stickiness test, a stickiness evaluation test was performed based on the presence or absence of embossing formed on the surface of the styrene elastomer resin.
The evaluation test uses a styrene-based elastomer resin having a rubber hardness of 15, 40 and a friction coefficient of 1.0, an average thickness of 3 mm, and an average roughness (Ra) of the texture formed on the surface of less than 10 μm. A sticky state and moldability were individually evaluated for a sample having a range of 200 μm and a sample having a size exceeding 200 μm. The results are shown in Table 4 below.
In Table 4 below, a sample with a sticky circle is a sample that does not feel sticky when the gripping part is gripped, a sample with a × mark is a sample that feels sticky, and a circle in the moldability is a sample that can be molded without problems. A cross indicates a sample in which moldability is hindered in terms of releasability from the mold.

Figure 0004558384
Figure 0004558384

表４に示す結果から、スチレン系エラストマー樹脂からなる被覆材のゴム硬度が１５〜４０の場合、ベタツキ性と成形性の点から、シボ加工の粗さはＲa＝１０〜２００μの範囲が好ましく、Ｒａ＝１０μ未満ではベタツキがあり、Ｒａ＝２００μ以上では成形性が悪いという問題を生じた。また、先のシボ加工は被覆材の全面、もしくは、被覆材表面の５０％以上に設けるのが望ましい。５０％未満の場合、シボ加工によるベタツキ防止効果が低くなる。従ってゴム硬度１５〜４０であり、１０〜２００μｍの範囲のシボ粗さのものが、ベタツキ性がなく、成形性にも良好な結果が得られた。   From the results shown in Table 4, when the rubber hardness of the coating material made of styrene-based elastomer resin is 15 to 40, the roughening roughness is preferably in the range of Ra = 10 to 200 µ in terms of stickiness and moldability. When Ra = 10 μm or less, there was stickiness, and when Ra = 200 μm or more, the moldability was poor. Further, it is desirable that the above embossing is provided on the entire surface of the covering material or 50% or more of the covering material surface. If it is less than 50%, the anti-sticking effect due to embossing is reduced. Accordingly, rubber having a rubber hardness of 15 to 40 and having a grain roughness in the range of 10 to 200 μm has no stickiness and good results in moldability.

図１は本発明に係る第１実施形態の歯ブラシを示すもので、図１（Ａ）は同歯ブラシの正面図、図１（Ｂ）は同歯ブラシの側面図、図１（Ｃ）は同歯ブラシの断面図、図１（Ｄ）は同歯ブラシの裏面図である。FIG. 1 shows a toothbrush according to a first embodiment of the present invention. FIG. 1 (A) is a front view of the toothbrush, FIG. 1 (B) is a side view of the toothbrush, and FIG. 1 (C) is the toothbrush. FIG. 1D is a back view of the toothbrush. 図２は本発明に係る第１実施形態の歯ブラシの一部を示すもので、図２（Ａ）は同歯ブラシの一部の正面図、図２（Ｂ）は同歯ブラシの一部の側面図、図２（Ｃ）は同歯ブラシの一部の断面図、図２（Ｄ）は同歯ブラシの一部の裏面図である。FIG. 2 shows a part of the toothbrush according to the first embodiment of the present invention. FIG. 2 (A) is a front view of a part of the toothbrush, and FIG. 2 (B) is a side view of a part of the toothbrush. FIG. 2C is a sectional view of a part of the toothbrush, and FIG. 2D is a rear view of a part of the toothbrush. 図３は本発明に係る第２実施形態の歯ブラシを示すもので、図３（Ａ）は同歯ブラシの正面図、図３（Ｂ）は同歯ブラシの側面図、図３（Ｃ）は同歯ブラシの断面図、図３（Ｄ）は同歯ブラシの裏面図である。FIG. 3 shows a toothbrush according to a second embodiment of the present invention. FIG. 3 (A) is a front view of the toothbrush, FIG. 3 (B) is a side view of the toothbrush, and FIG. 3 (C) is the toothbrush. FIG. 3D is a back view of the toothbrush. 図４は本発明に係る第２実施形態の歯ブラシの一部を示すもので、図４（Ａ）は同歯ブラシの一部の正面図、図４（Ｂ）は同歯ブラシの一部の側面図、図４（Ｃ）は同歯ブラシの一部の断面図、図４（Ｄ）は同歯ブラシの一部の裏面図である。FIG. 4 shows a part of the toothbrush according to the second embodiment of the present invention. FIG. 4 (A) is a front view of a part of the toothbrush, and FIG. 4 (B) is a side view of a part of the toothbrush. 4C is a cross-sectional view of a part of the toothbrush, and FIG. 4D is a back view of a part of the toothbrush.

符号の説明Explanation of symbols

Ａ…歯ブラシ、１…毛束、２…ヘッド部、３…首部、４…把持部（ハンドル部）、５…芯材部、５Ａ、５Ｂ、５Ｃ、５Ｄ…凸部、６…被覆部。   A ... toothbrush, 1 ... hair bundle, 2 ... head part, 3 ... neck part, 4 ... grip part (handle part), 5 ... core material part, 5A, 5B, 5C, 5D ... convex part, 6 ... covering part.

Claims (3)

毛束が植設されたヘッド部と、首部と、把持部を有し、前記把持部が、熱可塑性樹脂からなる芯材部と、該芯材部に接して芯材部の周面に被着され、この芯材部よりも軟質のエラストマー樹脂からなる被覆部とを具備してなり、前記被覆部が前記把持部の表面の７０％以上を覆い、前記芯材部の表面側に前記被覆部を介して視認可能なロゴレリーフ用の複数の表示突部を形成し、これら表示突部の上の前記被覆部の厚みを０．５〜２．０ｍｍの範囲として前記被覆部を介する前記表示突部の透視表示を可能とし、
前記被覆部の表面の摩擦係数を１以上とし、前記被覆部表面積の５０％以上にシボ加工を施してなり、前記被覆部のゴム硬度を１５〜４０の範囲、前記被覆部の厚みを２〜５ｍｍとし、前記シボ加工の粗さ（Ｒａ）を１０〜２００μｍの範囲としたことを特徴とする歯ブラシ。 A head portion having a hair bundle implanted therein, a neck portion, and a gripping portion, the gripping portion contacting a core material portion made of a thermoplastic resin, and covering the peripheral surface of the core material portion. And a covering portion made of an elastomer resin that is softer than the core material portion, the covering portion covers 70% or more of the surface of the gripping portion, and the surface side of the core material portion is covered with the covering Forming a plurality of display protrusions for logo relief that can be visually recognized through the portions, and setting the thickness of the covering portion on the display protrusions in the range of 0.5 to 2.0 mm through the covering portion Allows perspective display of protrusions,
The friction coefficient of the surface of the covering part is set to 1 or more, 50% or more of the surface area of the covering part is subjected to embossing, the rubber hardness of the covering part is in the range of 15 to 40, and the thickness of the covering part is 2 to 2. A toothbrush characterized in that the roughness (Ra) of the embossing process is in the range of 10 to 200 μm. 毛束が植設されたヘッド部と、首部と、把持部を有し、前記把持部が、熱可塑性樹脂からなる芯材部と、該芯材部に接して芯材部の周面に被着され、この芯材部よりも軟質のエラストマー樹脂からなる被覆部とを具備してなり、前記被覆部が前記把持部の表面の７０％以上を覆い、
前記把持部の前記首部側先端近傍の背面側、および、前記把持部において前記首部側と反対側の後端側近傍の植毛面部側及び背面側、前記把持部中央において前記植毛面側の表面側に、個々に前記芯材部から外方側に突出する凸部が形成され、これら凸部において前記被覆部から外部に露出している部分の合計面積が前記把持部の面積の１０％以下とされてなり、前記把持部において前記首部側と反対側の後端側近傍の植毛面部側の凸部と、前記把持部中央において前記植毛面側の表面側の凸部との間に、前記芯材部の表面側に前記被覆部を介して視認可能なロゴレリーフ用の複数の表示突部が形成され、これら表示突部の上の前記被覆部の厚みを０．５〜２．０ｍｍの範囲として前記被覆部を介する前記表示突部の透視表示が可能とされ、
前記被覆部の表面の摩擦係数を１以上とし、前記被覆部表面積の５０％以上にシボ加工を施してなり、前記被覆部のゴム硬度を１５〜４０の範囲、前記被覆部の厚みを２〜５ｍｍとし、前記シボ加工の粗さ（Ｒａ）を１０〜２００μｍの範囲としたことを特徴とする歯ブラシ。 A head portion having a hair bundle implanted therein, a neck portion, and a gripping portion, the gripping portion contacting a core material portion made of a thermoplastic resin, and covering the peripheral surface of the core material portion. And a covering portion made of an elastomer resin that is softer than the core material portion, and the covering portion covers 70% or more of the surface of the gripping portion,
The back side near the neck side tip of the grip part, the flocked surface part side and the back side near the back end side opposite to the neck part side in the grip part, and the surface side on the flocked surface side in the center of the grip part In addition, convex portions that protrude outward from the core member portion are individually formed, and the total area of the portions exposed to the outside from the covering portion in these convex portions is 10% or less of the area of the grip portion. is made in the in the grip portion and the neck side and the convex portion of the bristle surface side of the rear end near the opposite, between the convex portion of the surface of the flocked surface side in the gripper center, the core A plurality of display protrusions for logo relief that are visible through the covering portion are formed on the surface side of the material portion, and the thickness of the covering portion on the display protrusion ranges from 0.5 to 2.0 mm. As shown, the display projection through the covering portion can be transparently displayed,
The friction coefficient of the surface of the covering part is set to 1 or more, 50% or more of the surface area of the covering part is subjected to embossing, the rubber hardness of the covering part is in the range of 15 to 40, and the thickness of the covering part is 2 to 2. A toothbrush characterized in that the roughness (Ra) of the embossing process is in the range of 10 to 200 μm. 前記被覆部をスチレン系エラストマー樹脂から形成し、前記被覆部で前記把持部の表面の９０％以上を覆い、前記被覆部表面の摩擦係数を２．０以上とし、前記被覆部の厚みを２〜３ｍｍの範囲としたことを特徴とする請求項２に記載の歯ブラシ。   The covering portion is formed of a styrene-based elastomer resin, the covering portion covers 90% or more of the surface of the gripping portion, the friction coefficient of the covering portion surface is 2.0 or more, and the thickness of the covering portion is 2 to 2 The toothbrush according to claim 2, wherein the toothbrush is in a range of 3 mm.
JP2004177100A 2004-06-15 2004-06-15 toothbrush Expired - Fee Related JP4558384B2 (en)

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