JP2004202021A - Toothbrush - Google Patents

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Publication number
JP2004202021A
JP2004202021A JP2002376091A JP2002376091A JP2004202021A JP 2004202021 A JP2004202021 A JP 2004202021A JP 2002376091 A JP2002376091 A JP 2002376091A JP 2002376091 A JP2002376091 A JP 2002376091A JP 2004202021 A JP2004202021 A JP 2004202021A
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JP
Japan
Prior art keywords
brush
toothbrush
brushes
flocking
hole
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
Application number
JP2002376091A
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Japanese (ja)
Inventor
Tadashi Kanamaru
直史 金丸
Toshiaki Kobayashi
利彰 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lion Corp
Original Assignee
Lion Corp
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Filing date
Publication date
Application filed by Lion Corp filed Critical Lion Corp
Priority to JP2002376091A priority Critical patent/JP2004202021A/en
Publication of JP2004202021A publication Critical patent/JP2004202021A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a tooth brush where appearance discrimination property and using feeling is close to those of single implantation, costs are low, bristle coming-off is supresed, and operability, intradental advancing property and a dental plaque removing function are excellent in the toothbrush utilizing plane line implantation. <P>SOLUTION: In the toothbrush obtained by two-folding a bristle bundle 11 obtained by bundling a plurality of brushes 12 with a plane line 14 and striking it into an implantation hole 13 for fixing, when the maximum width of a brush cross section where the bristle bundle is to be implanted is set to be (d) and the middle point position of the maximum width (d) is set to be the center (c) of the brushes, a distance between the center (C) of a brush 12 most separated from the plane line 14, and the plane line 14 is in the range of L≤1.5×d. Further, the brushes 12 fixed to the hole 13 are arranged in a line along the plane line 14. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、刷毛の抜け強度の向上、ヘッド部の薄肉化を図るとともに、操作性、歯間進入性、外観差別性、歯垢除去性に優れた歯ブラシに関する。
【0002】
【従来の技術】
従来の歯ブラシは、歯ブラシヘッドの植毛面に1.0mm以上の間隔で形成された植毛穴に平線と呼ばれる止め具を用いて刷毛を二つ折りに打ち込むことにより、植毛穴1穴当たり16〜60本、折り返しで32〜120本程度の太い毛束を固定していた。一方、特許文献1には、1.0mm以内の植毛間隔で毛束を配置したものは、歯茎のマッサージ効果において優れることが示されている。
【0003】
一般に、歯ブラシにおいて毛束を太くすることは、毛腰強度の向上、植毛穴数の低減化につながるため、生産効率の向上につながる。そのため、インモールド法などの植毛技術を用いて大きな毛束を植毛する方法が種々開発され、実用化されている。
【0004】
一方、毛束を小さくしたもの(例えば、特許文献2参照)や、毛束としないで1本植毛するもの(例えば、特許文献3参照)なども提案されている。特に、特許文献3に示された1本植毛は、刷毛本来の特徴は引き出せるものの、毛束としての強度がないため、耐久性が不足し、毛の開きやヘタリが早くなり、その使用性に問題が残る。また、この1本植毛は、刷毛1本1本の特徴を引き出せる点で特長を有するが、その一方で、新しい植毛方式のために設備費や広大な設置場所を必要とするとともに、厳格な品質管理も必要とすることから、近時それほど利用されなくなってきている。
【0005】
口腔衛生面から見ると、太い毛束を有する歯ブラシは、口腔疾患好発部位とされる歯頸部、歯間部、咬合面の小窩裂溝部などに刷毛先が届きにくく、磨き残しが発生しやすいため、口腔疾患予防上課題が残されている。これは、毛束による歯面刷掃効果を発揮する一方で、毛束同士がブラッシング圧力を支え合ってしまうため、刷毛単体が持つ本来のしなやかな動きが発揮できず、歯間部や歯間三角などの口腔疾患好発部位とされる小さな部位に毛先が届きにくくなるためである。さらに、毛束が太いため、毛束が硬くなりがちで、口腔粘膜に対する刺激も大きい。また、毛束間の間隔が広いため、外観差別性も低く、新奇性にも乏しいため、ヘッドの形状、ハンドル形状、色などを工夫することにより、製品の差別化を図っているのが現状である。
【0006】
一方、植毛穴の形状に関しては、特許文献4に、楕円形をした植毛穴の短軸方向に平線を打ち込んだ歯ブラシが示されている。特許文献5には、長円形断面の植毛穴に断面矩形状の刷毛を植毛した歯ブラシが示されている。また、特許文献6および特許文献7には長方形状の植毛穴を用いた歯ブラシが示され、特許文献8には植毛穴の間隔を0.2〜0.4mmまで狭めた歯ブラシも示されている。
【0007】
特許文献9には、植毛面にその向きを異ならしめた長孔を形成し、この向きの異なる長孔に毛束を平線で植毛した歯ブラシが示されているが、刷毛の断面積を規定する記載はない。また、特許文献10〜12には、断面が楕円形状の毛束の長軸方向を歯ブラシヘッドの長軸方向や短軸方向に沿わせた歯ブラシが示されている。また、最近になって、新たな植毛法として特許文献13に見られるようなリボン状タフトを用いたり、特許文献14に見られるような2本植毛なども提案されている。
【0008】
以上、従来公知の技術について述べたが、いずれの場合も本発明のように毛束を構成する刷毛を平線に沿って1列に並ぶように配列して植毛した歯ブラシ構造については何ら開示されていない。
【0009】
【特許文献1】
特開2000−300344号公報
【特許文献2】
特開2000−342334号公報
【特許文献3】
特表平11−500946号公報
【特許文献4】
特開平8−332115号公報
【特許文献5】
特開平11−318565号公報
【特許文献6】
特開2000−201739号公報
【特許文献7】
特開平11−290133号公報
【特許文献8】
特開平11−113634号公報
【特許文献9】
特開2002−10834号公報
【特許文献10】
登録実用新案第2549935号公報
【特許文献11】
特開平10−327930号公報
【特許文献12】
特開平10−327931号公報
【特許文献13】
国際公開第99/42019号パンフレット
【特許文献14】
国際公開第99/62371号パンフレット
【0010】
【発明が解決しようとする課題】
平線で毛束を二つ折りにして植毛する平線植毛の場合、植毛穴の大きさと穴間隔は、植毛のしやすさから、大きめの植毛穴、広めの間隔として設計するのが一般的である。太い毛束を二つ折りにして固定するには、少なくとも毛束と平線高さの合計長さ以上の歯ブラシヘッドの厚みが必要である。このため、ヘッド部が厚くなりがちで、操作性に劣る点も指摘されている。また、太い毛束の場合、毛束を固定するための平線の長さも必然的に長くなり、それに応じて毛束間隔も広くならざるを得なかった。
【0011】
太い毛束は、刷掃実感が向上するが、一方では歯間への進入性が低下するため、う蝕好発部位の清掃性は低下する。さらに、近年増加している歯肉の退縮している人にとっては、硬い歯ブラシによるブラッシングは楔状欠損を助長させるため、毛腰の柔らかい歯ブラシのほうが望ましい。
【0012】
また、前記特許文献3に示された1本植毛では、刷毛単体の特性が効果的に発揮されるため、磨き心地、歯肉への当たり心地が向上し、さらにヘッド部も薄肉化が可能である。しかし、その反面、毛束としての剛性がないため、毛腰が弱く、刷掃力の点で十分ではない。
【0013】
刷掃効果の高い太い毛束と、狭いう蝕好発部位の清掃に適した1本植毛とを組み合わせた歯ブラシも従来技術を応用すれば製造可能であるが、歯ブラシとしての新奇性がない。
【0014】
このように、従来の歯ブラシは、刷掃効果、う蝕好発部位の清掃、耐久性のすべてを同時に十分に満足できるものがないのが現状である。
【0015】
本発明は、上記問題を解決するためになされたもので、平線式植毛を利用した歯ブラシにおいて、1本植毛に近い外観差別性と使用感を有し、低コストで、しかも毛抜け強度の向上、ヘッド部の薄肉化を図るとともに、歯ブラシの操作性、歯間進入性、歯垢除去機能に優れた歯ブラシを提供することを課題とするものである。
【0016】
【課題を解決するための手段】
本発明は、上記課題を解決するため、複数本の刷毛を束ねた毛束を平線によって二つ折りにして打ち込むことにより植毛穴に固定した歯ブラシにおいて、植毛される刷毛断面の最大幅をd、該最大幅dの中点位置を刷毛の中心Cとするとき、平線から最も離れた刷毛の中心Cと平線との距離LをL≦1.5×dの範囲としたものである。さらに、植毛穴に固定された刷毛が平線に沿って一列に並ぶように構成したものである。このとき、一列に並んだ刷毛列は、複数本の刷毛から構成されており、刷毛列の長さは、好ましくは0.5〜5.0mm、より好ましくは1.0〜2.0mmである。このような構成とすることにより、毛束でありながら1本植毛に近い外観差別性と使用感を与えることができ、低コストで、しかも毛抜け強度の向上、ヘッド部の薄肉化を図ることができるとともに、歯ブラシの操作性、歯間進入性、歯垢除去機能に優れた歯ブラシとすることができる。
【0017】
実際の植毛に際しては、ハンドル成形時の樹脂の収縮、ハンドルの材質、射出成形条件(温度、圧力、冷却条件)、植毛穴形状、植毛本数、刷毛断面形状、刷毛種類、刷毛材質、植毛機種、ピッカー形状、植毛速度など、様々な因子によりバラツキが発生する。そこで、これらのバラツキを考慮して種々実験を重ねた結果、L≦1.5×dの範囲とすれば上記目的とする効果をさらに確実に得られることを突き止めたものである。L>1.5×dの場合、刷毛が植毛穴内で2列以上に並ぶ可能性があり、歯間進入性、外観差別性などの効果が期待できない。また、刷毛が一列に並ぶ場合であっても、L>1.5×dの場合には、平線と刷毛の隙間が広くなり、毛立ちが悪くなる。
【0018】
また、上記植毛に際し、植毛穴に対する毛束のパッキングファクター(PF)を40%以上とすれば、上記効果をより一層発揮させることができる。パッキングファクターとは、植毛穴の穴断面積に対する植設される毛束の刷毛断面積の総和の比率を百分率で表したものである。パッキングファクターが40%よりも低いと毛立ちが悪くなり、耐久性、歯垢除去機能が低下する。パッキングファクターが100%近くになると刷毛同士が重なり合って平線に沿って一列に並べなくなり、毛立ちが悪くなるとともに、刷毛折れや引っ張り強度の低下につながるおそれがある。したがって、パッキングファクターの上限は、植毛穴と毛束および平線の仕様に応じて決定することが望ましい。
【0019】
なお、本発明にいう平線とは、植毛穴に刷毛を二つ折りにして打ち込んで固定する際に用いられる止め具全般を指すものであり、名称の違いや材質、形状などによって限定を受けるものではない。また、植毛した刷毛が平線に沿って一列に並ぶように構成する植毛穴は、ヘッド部に形成されたすべての植毛穴について行ってもよいし、一部の植毛穴だけに適用してもよいものである。歯ブラシの仕様に応じて決定すればよい。
【0020】
本発明の場合、植毛穴の穴形状に制限はなく、通常の円形でもよいが、平線に沿って刷毛を一列に並べる必要上から、正方形または長方形、長円形(小判形)、楕円形、角に丸みの付いた略正方形または略長方形など、穴形状に方向性を有する形状とする方が好ましい。また、その方向を組み合わせることによって、目的とする歯間進入性、毛の当たり心地、刷掃実感に応じた仕様の設計が可能である。平線は、これら穴形状からなる植毛穴の長辺または長軸に沿って平行に打ち込む方式とするのがより好ましい。短辺または短軸に沿って平行に打ち込む方法も可能である。
【0021】
本発明のように刷毛を平線に沿って一列に並べて植毛した場合、刷毛は一列に並んだ状態で折り返されるため、1本植毛並の外観差別性を与えることができる。また、歯間進入性も高まり、狭いう蝕好発部位にも一列の剛性を有する毛束によって効果的に進入することができ、このような部位の歯垢もしっかりと除去することができる。さらに、刷毛の1本1本を平線が直接止めているため、1本毛抜け強度は従来品よりも飛躍的に向上するとともに、バラツキも少なくなり、歯ブラシとしての品質が向上する。
【0022】
植毛穴の配置は特に制限はないが、歯間進入性を向上させるためには、歯ブラシヘッドの外周部の植毛穴に沿って、平線を歯ブラシハンドル長手方向に対してほぼ直角に近い角度で打ち込んだものが好ましい。一方、歯肉へのマッサージ効果などを出すためには、歯ブラシハンドル長手方向と平行に植毛穴の長軸を配し、平線を植毛穴の長軸と平行に打ち込んだものが好ましい。また、刷掃実感やデザイン、生産性などの面から、ヘッド部中央付近に従来の太い毛束を組み合わせるようにすることが好ましい。植毛穴に植毛する刷毛の本数、太さ、長さ、色に制限はない。
【0023】
使用する平線の材質、太さに制限はないが、植毛穴の面積を調節するためには厚みの異なる平線を使用することが好ましい。また、溝付き平線など、切断断面が矩形にならない平線類も用途に応じて仕様することができる。
【0024】
植毛穴の長軸方向に平線を打ち込む際は、平線に沿って刷毛が並ぶため、植毛強度(1本毛抜け強度)が向上する。また、平線の打ち込み方向によってヘッド部最外側の毛束が細く見えるようになるので、外観差別性を向上させることができる。この際の植毛穴形状は、毛束と植毛穴との隙間を減らすために、長方形もしくは略長方形が望ましい。
【0025】
本発明の歯ブラシで使用する平線の材質は、真鍮、ステンレスなどの金属の他、生分解性プラスチックを初め、硬質プラスチックなども使用可能である。植毛穴と毛束とを確実に固定して空隙を少なくするために、平線の厚みを変えて空隙を調整することもできる。使用する平線の厚みや幅には特に制限はなく、任意に設定することができる。
【0026】
歯ブラシヘッド部を含む歯ブラシハンドル材料としては、ポリスチレン樹脂(PS)、ポリプロピレン樹脂(PP)、ポリエチレンテレフタレート樹脂(PET)、アクリロニトリルブタジエンスチレン樹脂(ABS)、セルロースプロピオネート樹脂(CP)、ポリアリレート樹脂、ポリカーボネート樹脂(PC)、アクリロニトリルスチレン樹脂(AS)、ポリアセタール樹脂(POM)、ポリブチレンテレフタレート樹脂(PBT)、飽和ポリエステル樹脂(PCTA)などが単独または混合して用いられる。また、熱可塑性エラストマー類と組み合わせた多色成形ハンドルとすることも可能であり、ハンドル材料は上記記載の制限を受けない。また、歯ブラシヘッド部の形状、大きさ、デザインも特に制限はない。
【0027】
毛束を構成する刷毛(フィラメント)の材料としては、ポリエチレンテレフタレート、ポリブ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などのポリエステル、ナイロン6、ナイロン66、ナイロン6−10、ナイロン6−12、ナイロン12などのポリアミド、ポリエチレン、ポリプロピレンなどのポリオレフィン、およびポリフッ化ビニリデンなどのポリハロゲン化ビニルなどの溶融紡糸可能な素材が使用されるが、使用感、耐久性などの点で、ナイロン、ポリトリメチレンテレフタレートが好ましい。また、これらの刷毛を二重芯鞘状に成形し、外側と内側の材質の異なる刷毛としたり、表面状態の異なる刷毛などを目的に応じて使用することができる。
【0028】
刷毛の太さとしては、3〜10ミル(0.076〜0.254mm)、好ましくは5〜8ミル(0.125〜0.203mm)ものがよい。さらに、使用性、刷掃実感、清掃効果、耐久性などを考慮して、これらを組み合わせて利用することもできる。特に、多数穴を配置した仕様の場合、ヘッド部外側の毛束より中央に向かうほど刷毛の強度を硬くし、または変化(太さ、材質、長さ、色、断面形状)させることは、使用感、外観差別性の上からも好ましい。
【0029】
刷毛の種類も何ら制限はないが、例えば、通常のラウンド用毛、テーパー用毛、ダイヤモンド用毛、フェザー用毛、異形断面用毛、グレイニー用毛、スパイラルキャッチ用毛、インジケータ用毛などを利用することができる。
【0030】
刷毛のプロファイルリングに関しては、自由端部の毛切り形状と刷毛長を目的に応じて設定し、単一平面状、山切り状、凹凸形状としたり、さらには外側と内側、先端部側と後端部側などで異なった構成としてもよい。
【0031】
【発明の実施の形態】
以下、本発明の実施の形態について、図面を参照して説明する。
図1に本発明の第1の実施の形態を示す。(a)は平線を用いて植毛された毛束の模式斜視図、(b)はその模式拡大平面図、(c)は毛束を構成する刷毛の断面図である。
【0032】
この第1の実施の形態は、毛束11を円形断面からなる刷毛12によって構成するとともに、植毛穴13として長方形状の植毛穴を採用し、毛束11を平線14によって植毛穴13の長辺方向に沿って二つ折りに打ち込むことにより、各刷毛12が平線14に沿って一列に並ぶように植毛したものである。そして、この植毛に際し、毛束11を構成する刷毛12の刷毛断面の最大幅をd、該最大幅dの中点位置を刷毛の中心Cとするとき、平線14から最も離れた刷毛12の中心Cと平線14との距離L(図1ではすべての刷毛が平線から等距離)が、L≦1.5×dの範囲、さらに、植毛穴13に対する毛束11のパッキングファクターが40%以上となるように、刷毛12の直径と本数、植毛穴13の長辺と短辺の長さ、平線14の厚さなどを設定したものである。
【0033】
このような構成とした場合、刷毛12が平線14に沿って一列に並んでいるので、1本植毛に近い外観差別性と使用感を与えることができる。また、低コストで、毛抜け強度も向上するとともに、歯ブラシの操作性、歯間進入性、歯垢除去機能も優れたものとなる。さらに、各刷毛12は1本毎に2つ折りに植毛されるので、植毛穴13内で複数本の刷毛がヘッド部上下方向に重なって嵩高くなるようなこともないので、ヘッド部の上下方向の厚さも薄くすることができる。
【0034】
図2に本発明の第2の実施の形態を示す。
この第2の実施の形態は、前記第1の実施の形態と同様な構成において、刷毛12として星形断面になる刷毛を用いた場合の例である。星形断面の刷毛12を用いた場合、刷毛断面の最大幅dと刷毛の中心Cは、(b)に示すような位置となる。また、(a)に示すように、星形断面になる刷毛12のすべてが平線14に接せず、その一部が平線14から浮いているような場合には、平線14から最も離れた刷毛12の中心Cと平線14との距離LがL≦1.5×dの範囲となるように設定する。
【0035】
図3に本発明の第3の実施の形態を示す。
この第3の実施の形態は、前記第1の実施の形態と同様な構成において、刷毛12として八角形断面の刷毛を用いた場合の例である。八角形断面の刷毛12を用いた場合、刷毛断面の最大幅dと刷毛の中心Cは、(b)に示すような位置となる。
【0036】
図4に本発明を適用して構成した歯ブラシの一例を示す。(a)はヘッド部に形成された植毛穴の形状とその配置パターンを示す図、(b)(c)は従来形式で植毛された毛束部分の略示拡大平面図とその断面図、(d)(e)は本発明形式で植毛された毛束部分の略示拡大平面図とその断面図である。
【0037】
この図4の例は、(a)に示すように、ヘッド部15の植毛面中央部付近に円形状の植毛穴16を配置するとともに、植毛面外周部には、前記円形状の植毛穴16を囲むように、長方形状の植毛穴13をその長辺が歯ブラシハンドルの長手方向と直行する向きに配置し、さらに、中央付近の円形状の植毛穴16には、(b)(c)に示すように、複数本の刷毛17を平線18によって従来形式で二つ折りに植毛するとともに、外周部の長方形状の植毛穴13には、(d)(e)に示すように、複数本の刷毛12を平線14に沿って一列に並ぶように本発明形式で植毛したものである。このように、ヘッド部中央付近に従来形式の毛束を植毛し、その周りを取り囲むように本発明形式の毛束を配置すれば、刷掃実感や外観差別性の上からより好ましいものとなる。
【0038】
(実験例)
本発明の歯ブラシと従来の歯ブラシを用いて植毛強度の測定と官能評価を行った。その結果を以下に示す。
【0039】
1.植毛強度(1本毛抜け強度)
植毛穴に植毛されている刷毛1本を専用器具でつかみ、刷毛が植毛穴から抜けるまでの最大引っ張り応力を測定した。その結果を表1に示す。表から明らかなように、本発明品は従来品に比べて植毛強度(1本毛抜け強度)が格段に向上することが確認された。なお、測定機器は、島津製作所製オートグラフ(引っ張り速度20mm/分)を用いた。
【0040】
【表1】

Figure 2004202021
【0041】
2.植毛穴深さの違いによる植毛強度(1本毛抜け強度)
深さの異なる植毛穴に植毛されている刷毛1本を専用器具でつかみ、刷毛が植毛穴から抜けるまでの最大引っ張り応力を測定した。その結果を表2に示す。表から明らかなように、本発明品は従来品に比べて1本毛抜け強度(対深さ)が格段に向上することが確認された。従来品は植毛穴が浅いと刷毛が抜けやすいといった不具合があったが、本発明品は浅い場合でも刷毛が抜けにくく、優れた品質を有する。なお、測定機器は表1と同じものを用いた。
【0042】
【表2】
Figure 2004202021
【0043】
3.官能評価
図5〜図8に示す植毛穴形状と配置パターンからなる本発明の歯ブラシと、図9および図10に示す植毛穴形状と配置パターンからなる従来の歯ブラシを用いて、パネラー20名による官能評価試験を行った。その結果を表3に示す。表から明らかなように、本発明品は、歯肉マッサージ効果、歯間進入性、刷掃実感のすべてを同時に満足できることが証明された。なお、各図において、符号13で示す植毛穴が前述した本発明形式で刷毛を植毛穴、符号16で示す植毛穴が従来形式で刷毛を植毛した植毛穴である。図面を分かりやすくするため、各植毛穴に植毛されている刷毛については図示を略した。
【0044】
【表3】
Figure 2004202021
【0045】
なお、上記官能評価の評価基準は次によった。
1.歯肉マッサージの評価
○:歯肉のマッサージ感が高い
△:どちらとも言えない
×:歯肉のマッサージ感が低い
2.歯間進入性の評価
○:歯間進入性がよい
△:どちらとも言えない
×:歯間進入性が劣る
3.刷掃実感の評価
○:刷掃実感が高い
△:どちらとも言えない
×:刷掃実感が低い
4.総合評価
○:良好
△:どちらとも言えない
×:劣る
【0046】
図11に、本発明で用いる刷毛12の断面形状の例をいくつか示す。(a)は円形断面の例、(b)は四角形断面の例、(c)は菊花形断面の例、(d)は楕円形断面の例、(e)は長方形断面の例、(f)は菱形断面の例、(g)は短冊形断面の例、(h)は光芒形断面の例である。各刷毛断面において、刷毛断面の最大幅dと刷毛の中心Cは、それぞれ図中に示すような位置となる。
【0047】
【発明の効果】
以上説明したように、本発明によれば、平線を用いて二つ折りに植毛された刷毛が植毛穴内で平線に沿って一列に並ぶように構成したので、平線式植毛を利用した歯ブラシにおいて1本植毛に近い外観差別性と使用感を与えることができる。また、低コストで、しかも毛抜け強度の向上とヘッド部の薄肉化を図ることができるとともに、歯ブラシの操作性、歯間進入性、歯垢除去機能の優れた歯ブラシとすることができる。
【図面の簡単な説明】
【図1】本発明の第1の実施の形態を示すもので、(a)は平線を用いて植毛された毛束の模式斜視図、(b)はその模式拡大平面図、(c)は毛束を構成する刷毛の断面図である。
【図2】本発明の第2の実施の形態を示すもので、(a)は平線を用いて植毛された植毛穴部分の模式平面図、(b)は毛束を構成する刷毛の断面図である。
【図3】本発明の第3の実施の形態を示すもので、(a)は平線を用いて植毛された植毛穴部分の模式拡大平面図、(b)は毛束を構成する刷毛の断面図である。
【図4】本発明を適用して構成した歯ブラシを示すもので、(a)はヘッド部に形成された植毛穴の形状とその配置パターンを示す図、(b)は従来形式で植毛された植毛穴部分の略示拡大平面図、(c)は従来形式で植毛された植毛穴部分の略示拡大断面図、(d)は本発明形式で植毛された植毛穴部分の略示拡大平面図、(e)は本発明形式で植毛された植毛穴部分の略示拡大断面図である。
【図5】官能評価試験に用いた本発明の歯ブラシの第1の実施例(本発明品1)を示すもので、(a)はヘッド部の略示平面図、(b)は植毛穴と平線の向きを示す略示平面図である。
【図6】官能評価試験に用いた本発明の歯ブラシの第2の実施例(本発明品2)を示すもので、(a)はヘッド部の略示平面図、(b)は植毛穴と平線の向きを示す略示平面図である。
【図7】官能評価試験に用いた本発明の歯ブラシの第3の実施例(本発明品3)を示すもので、(a)はヘッド部の略示平面図、(b)は植毛穴と平線の向きを示す略示平面図である。
【図8】官能評価試験に用いた本発明の歯ブラシの第4の実施例(本発明品4)を示すもので、(a)はヘッド部の略示平面図、(b)は植毛穴と平線の向きを示す略示平面図である。
【図9】官能評価試験に用いた従来の歯ブラシの第1の例(従来品1)を示すもので、(a)はヘッド部の略示平面図、(b)は植毛穴と平線の向きを示す略示平面図である。
【図10】官能評価試験に用いた従来の歯ブラシの第2の例(従来品2)を示すもので、(a)はヘッド部の略示平面図、(b)は植毛穴と平線の向きを示す略示平面図である。
【図11】(a)〜(h)は、それぞれ本発明で用いる刷毛の断面形状の例を示す図である。
【符号の説明】
11 毛束
12 刷毛
13 植毛穴
14 平線
15 ヘッド部
16 植毛穴(従来形式)
17 刷毛(従来形式)
18 平線(従来形式)[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a toothbrush which improves the removal strength of a brush, reduces the thickness of a head portion, and is excellent in operability, interdental penetration, appearance discrimination, and plaque removal.
[0002]
[Prior art]
A conventional toothbrush uses a stopper called a flat line to drive a brush into two folds into a flocked hole formed on a flocked surface of a toothbrush head at an interval of 1.0 mm or more, so that 16 to 60 brushes per flocked hole are used. A thick bundle of about 32 to 120 hairs was fixed by the book and the folding. On the other hand, Patent Literature 1 discloses that a hair bundle arranged at a hair transplant interval of 1.0 mm or less is excellent in a gum massage effect.
[0003]
In general, thickening the bristle bundle in the toothbrush leads to improvement in the bristle strength and reduction in the number of flocked holes, leading to improvement in production efficiency. For this reason, various methods of implanting a large hair bundle using an implanting technique such as an in-mold method have been developed and put into practical use.
[0004]
On the other hand, there have been proposed ones in which the hair bundle is made smaller (for example, see Patent Document 2) and those in which one hair is planted without being made into a hair bundle (for example, see Patent Document 3). In particular, the single hair transplantation disclosed in Patent Literature 3 can bring out the inherent characteristics of the brush, but lacks the strength as a hair bundle, and therefore lacks durability, opens the hair and setshes faster, and reduces its usability. The problem remains. In addition, the single flocking is characterized in that it can bring out the characteristics of each brush, but on the other hand, the new flocking method requires equipment costs and a vast installation area, and strict quality. Recently, it has become less used because of the need for management.
[0005]
From the point of view of oral hygiene, toothbrushes with thick hair bundles have difficulty reaching the brush tip to the cervical region, interdental region, pit fissures on the occlusal surface, etc. Therefore, there remains a problem in preventing oral diseases. This is because the bristle bundle exerts the tooth surface cleaning effect, but the bristle bundles support each other's brushing pressure. This is because it is difficult for the hair tips to reach small sites, such as triangles, which are considered to be oral disease sites. In addition, since the hair bundle is thick, the hair bundle tends to be hard, and irritation to the oral mucosa is large. In addition, because the distance between the hair bundles is wide, the appearance discrimination is low, and the novelty is poor.Therefore, we are currently trying to differentiate products by devising the shape of the head, handle shape, color, etc. It is.
[0006]
On the other hand, with respect to the shape of the flocking hole, Patent Document 4 discloses a toothbrush in which a flat line is driven in the short axis direction of the elliptical flocking hole. Patent Document 5 discloses a toothbrush in which a brush having a rectangular cross section is planted in a flocking hole having an oval cross section. Patent Literature 6 and Patent Literature 7 show toothbrushes using rectangular flocking holes, and Patent Literature 8 also shows toothbrushes in which the spacing between flocking holes is reduced to 0.2 to 0.4 mm. .
[0007]
Patent Literature 9 discloses a toothbrush in which long holes having different directions are formed on a flocked surface, and a bristle bundle is planted with a flat wire in the long holes having different directions. There is no description to do. Patent Documents 10 to 12 disclose toothbrushes in which the major axis direction of a bristle bundle having an elliptical cross section is aligned with the major axis direction or minor axis direction of a toothbrush head. Also, recently, a new tufting method using a ribbon-shaped tuft as disclosed in Patent Literature 13 or a double flocking as disclosed in Patent Literature 14 has been proposed.
[0008]
As described above, conventionally known techniques have been described, but in any case, there is no disclosure about a toothbrush structure in which the brushes constituting the bristle bundle are arranged and arranged in a line along a flat line as in the present invention. Not.
[0009]
[Patent Document 1]
JP 2000-300344 A [Patent Document 2]
JP 2000-342334 A [Patent Document 3]
Japanese Patent Publication No. 11-500946 [Patent Document 4]
JP-A-8-332115 [Patent Document 5]
JP-A-11-318565 [Patent Document 6]
JP 2000-201739 A [Patent Document 7]
JP-A-11-290133 [Patent Document 8]
JP-A-11-113634 [Patent Document 9]
Japanese Patent Application Laid-Open No. 2002-10834 [Patent Document 10]
Registered Utility Model No. 2549935 [Patent Document 11]
JP 10-327930 A [Patent Document 12]
Japanese Patent Application Laid-Open No. 10-327931 [Patent Document 13]
International Publication No. 99/42019 pamphlet [Patent Document 14]
WO 99/62371 pamphlet [0010]
[Problems to be solved by the invention]
In the case of flat-line flocking, in which the hair bundle is folded in two with a flat wire and planted, it is common to design the size and spacing of the flocked holes as a larger flocked hole and a wider spacing from the ease of flocking. is there. In order to fold and fix the thick bristle bundle in two, the thickness of the toothbrush head is required to be at least the total length of the bristle bundle and the height of the flat wire. For this reason, it is pointed out that the head portion tends to be thick and the operability is poor. Further, in the case of a thick hair bundle, the length of a flat wire for fixing the hair bundle is inevitably increased, and the interval between the hair bundles must be increased accordingly.
[0011]
A thick bristle bundle improves the feeling of brushing, but on the other hand, the penetration between teeth is reduced, so that the cleaning ability of the carious parts is reduced. In addition, for those with gingival retraction, which has increased in recent years, brushing with a hard toothbrush promotes wedge-shaped defects, and therefore, a toothbrush with a soft bristle is preferable.
[0012]
In addition, in the single flocking method disclosed in Patent Document 3, the characteristics of the brush alone are effectively exhibited, so that the brushing comfort and the gingival comfort are improved, and the head portion can be made thinner. . However, on the other hand, since there is no rigidity as a bristle bundle, the bristle is weak and the brushing power is not sufficient.
[0013]
A toothbrush combining a thick bristle bundle having a high brushing effect and a single hair transplantation suitable for cleaning a narrow caries-prone site can be manufactured by applying the conventional technology, but there is no novelty as a toothbrush.
[0014]
As described above, at present, there is no conventional toothbrush capable of sufficiently satisfying all of the brushing effect, cleaning of carious parts, and durability.
[0015]
The present invention has been made in order to solve the above-mentioned problems, and in a toothbrush using flat-line flocking, it has an appearance discriminating property and a feeling of use close to that of single-flocking, is low-cost, and has a hair removal strength. It is an object of the present invention to provide a toothbrush which is improved in operability, interdental penetration, and plaque removing function while improving the head portion and making the head portion thinner.
[0016]
[Means for Solving the Problems]
The present invention, in order to solve the above-described problems, in a toothbrush fixed to a flocked hole by bunching a bundle of a plurality of brushes into two by a flat wire and driving the same, the maximum width of the brush cross section to be planted is d, When the midpoint of the maximum width d is the center C of the brush, the distance L between the center C of the brush furthest from the flat line and the flat line is in a range of L ≦ 1.5 × d. Further, the brushes fixed to the flocking holes are arranged in a line along a flat line. At this time, the brush row arranged in a row is composed of a plurality of brushes, and the length of the brush row is preferably 0.5 to 5.0 mm, more preferably 1.0 to 2.0 mm. . By adopting such a configuration, it is possible to give a distinctive appearance and a feeling of use close to that of a single flocking, even though it is a bristle bundle, and to achieve low cost, improved hair removal strength, and a thinner head portion. And a toothbrush excellent in operability, interdental penetration, and plaque removal function of the toothbrush.
[0017]
At the time of actual flocking, resin shrinkage during handle molding, handle material, injection molding conditions (temperature, pressure, cooling conditions), flocking hole shape, number of flocking, brush cross-sectional shape, brush type, brush material, bristle model, Variations occur due to various factors such as the picker shape and the flocking speed. Therefore, as a result of repeating various experiments in consideration of these variations, it has been found that the above-described object effect can be more reliably obtained if L ≦ 1.5 × d. If L> 1.5 × d, the brushes may be arranged in two or more rows in the flocked holes, and effects such as interdental penetration and appearance discrimination cannot be expected. Further, even when the brushes are arranged in a line, when L> 1.5 × d, the gap between the flat line and the brushes is widened, and the brushing becomes poor.
[0018]
Further, at the time of the above-described flocking, if the packing factor (PF) of the bristle bundle with respect to the flocking hole is set to 40% or more, the above-mentioned effect can be further exerted. The packing factor is a percentage of the total sum of the cross-sectional area of the brush of the hair bundle to be planted and the cross-sectional area of the bristle hole. If the packing factor is lower than 40%, the hair becomes poor and the durability and the plaque removing function deteriorate. If the packing factor is close to 100%, the brushes will overlap each other and will not be arranged in a line along the flat line, resulting in poor bristle and breakage of the brush and a decrease in tensile strength. Therefore, it is desirable that the upper limit of the packing factor is determined according to the specifications of the flocking hole, the hair bundle, and the flat wire.
[0019]
In addition, the flat line referred to in the present invention refers to all the fasteners used when a brush is folded in two in a flocking hole and fixed by hitting, and is limited by differences in names, materials, shapes, and the like. is not. Also, the flocked holes configured so that the transplanted brushes are arranged in a line along the flat line may be performed for all the flocked holes formed in the head portion, or may be applied to only some of the flocked holes. Good thing. What is necessary is just to determine according to the specification of a toothbrush.
[0020]
In the case of the present invention, the shape of the flocked hole is not limited, and may be a normal circle. However, from the necessity of arranging the brushes in a line along a flat line, a square or a rectangle, an oval (oval), an oval, It is preferable that the hole has a shape having directionality, such as a substantially square or a substantially rectangular shape with rounded corners. Further, by combining the directions, it is possible to design the specifications according to the desired inter-tooth penetration, the feeling of contact with the hair, and the feeling of actual brushing. More preferably, the flat line is driven in parallel along the long side or long axis of the flocking hole having the hole shape. A method of driving in parallel along the short side or short axis is also possible.
[0021]
When brushes are arranged in a line along a flat line and planted as in the present invention, the brushes are folded back in a state of being arranged in a line, so that it is possible to give the appearance distinctiveness equivalent to that of a single brush. In addition, the interdental invasion property is also enhanced, and it is possible to effectively enter a narrow caries-prone area by a hair bundle having a single row of rigidity, and plaque in such a area can be firmly removed. Further, since the brush directly stops each brush, the strength of pulling out each brush is remarkably improved as compared with the conventional product, the variation is reduced, and the quality as a toothbrush is improved.
[0022]
The arrangement of the flocked holes is not particularly limited, but in order to improve interdental penetration, a flat line is formed at an angle almost perpendicular to the longitudinal direction of the toothbrush handle along the flocked holes on the outer periphery of the toothbrush head. Driving is preferred. On the other hand, in order to exert a massage effect on the gums, it is preferable that the long axis of the flocking hole is arranged in parallel with the longitudinal direction of the toothbrush handle, and a flat line is driven in parallel with the long axis of the flocking hole. In addition, it is preferable to combine a conventional thick hair bundle in the vicinity of the center of the head from the viewpoints of brush feeling, design, and productivity. There is no limitation on the number, thickness, length, and color of the brushes to be implanted in the implant holes.
[0023]
The material and thickness of the flat wire used are not limited, but it is preferable to use flat wires having different thicknesses in order to adjust the area of the flocking hole. In addition, flat wires whose cross section does not become rectangular, such as a flat wire with a groove, can be specified according to the application.
[0024]
When a flat line is driven in the long axis direction of the flocking hole, the brushes are arranged along the flat line, so that the flocking strength (strength of single bristle removal) is improved. Further, the hair bundle on the outermost side of the head portion can be seen to be thin depending on the direction in which the flat wire is driven, so that the appearance discrimination can be improved. In this case, the shape of the flocking hole is desirably rectangular or substantially rectangular in order to reduce the gap between the bristle bundle and the flocking hole.
[0025]
As the material of the flat wire used in the toothbrush of the present invention, besides metals such as brass and stainless steel, hard plastics as well as biodegradable plastics can be used. In order to securely fix the flocking hole and the hair bundle and reduce the gap, the gap can be adjusted by changing the thickness of the flat wire. The thickness and width of the flat wire used are not particularly limited and can be set arbitrarily.
[0026]
Materials for the toothbrush handle including the toothbrush head include polystyrene resin (PS), polypropylene resin (PP), polyethylene terephthalate resin (PET), acrylonitrile butadiene styrene resin (ABS), cellulose propionate resin (CP), and polyarylate resin. , A polycarbonate resin (PC), an acrylonitrile styrene resin (AS), a polyacetal resin (POM), a polybutylene terephthalate resin (PBT), a saturated polyester resin (PCTA) and the like are used alone or in combination. It is also possible to use a multicolor molded handle in combination with thermoplastic elastomers, and the handle material is not subject to the restrictions described above. The shape, size, and design of the toothbrush head are not particularly limited.
[0027]
Examples of the material of the brush (filament) constituting the hair bundle include polyester such as polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate, and polyamide such as nylon 6, nylon 66, nylon 6-10, nylon 6-12, and nylon 12. Materials that can be melt-spun, such as polyolefins such as polyethylene and polypropylene, and polyvinyl halides such as polyvinylidene fluoride are used, and nylon and polytrimethylene terephthalate are preferred in terms of feeling of use and durability. In addition, these brushes can be formed into a double core-sheath shape, and brushes having different materials on the outside and inside can be used, or brushes having different surface conditions can be used according to the purpose.
[0028]
The thickness of the brush is 3 to 10 mils (0.076 to 0.254 mm), preferably 5 to 8 mils (0.125 to 0.203 mm). Further, in consideration of usability, feeling of cleaning, cleaning effect, durability and the like, these can be used in combination. In particular, in the case of the specification with many holes, it is necessary to harden or change the brush strength (thickness, material, length, color, cross-sectional shape) toward the center from the bristle bundle outside the head part. It is preferable from the viewpoint of feeling and appearance discrimination.
[0029]
There are no restrictions on the type of brush, but for example, use regular round hair, taper hair, diamond hair, feather hair, irregular cross hair, grainy hair, spiral catch hair, indicator hair, etc. can do.
[0030]
Regarding the profile ring of the brush, set the bristle shape at the free end and the bristle length according to the purpose, and make it a single plane shape, mountain cut shape, uneven shape, furthermore, outside and inside, tip side and rear The configuration may be different on the end side or the like.
[0031]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a first embodiment of the present invention. (A) is a schematic perspective view of a hair bundle implanted using a flat wire, (b) is a schematic enlarged plan view thereof, and (c) is a cross-sectional view of a brush constituting the hair bundle.
[0032]
In the first embodiment, the bristle bundle 11 is constituted by a brush 12 having a circular cross section, a rectangular flocking hole 13 is employed as the flocking hole 13, and the bristle bundle 11 is formed by a flat wire 14. By brushing in two along the side direction, the brushes 12 are planted so that the brushes 12 are arranged in a line along the flat line 14. At the time of this flocking, when the maximum width of the brush cross section of the brushes 12 constituting the bristle bundle 11 is d, and the midpoint position of the maximum width d is the center C of the brush, the brush 12 farthest from the flat line 14 is The distance L between the center C and the flat line 14 (all brushes are equidistant from the flat line in FIG. 1) is in the range of L ≦ 1.5 × d, and the packing factor of the bristle bundle 11 with respect to the flocking hole 13 is 40. %, The diameter and the number of the brushes 12, the length of the long side and the short side of the flocked hole 13, the thickness of the flat wire 14, and the like are set so as to be% or more.
[0033]
In the case of such a configuration, the brushes 12 are arranged in a line along the flat line 14, so that it is possible to give a differentiating appearance and a feeling of use close to a single flock. In addition, the bristle pullout strength is improved at low cost, and the operability, interdental penetration, and plaque removing function of the toothbrush are also improved. Furthermore, since each brush 12 is implanted in two folds for each brush, there is no possibility that a plurality of brushes overlap in the flocking hole 13 in the vertical direction of the head and become bulky. Can also be reduced in thickness.
[0034]
FIG. 2 shows a second embodiment of the present invention.
The second embodiment is an example in which a brush having a star-shaped cross section is used as the brush 12 in a configuration similar to that of the first embodiment. When the brush 12 having a star-shaped cross section is used, the maximum width d of the brush cross section and the center C of the brush are located as shown in FIG. Also, as shown in (a), when all of the brushes 12 having a star-shaped cross section do not touch the flat wire 14 and a part thereof is floating from the flat wire 14, The distance L between the center C of the brush 12 and the flat line 14 is set so that L ≦ 1.5 × d.
[0035]
FIG. 3 shows a third embodiment of the present invention.
The third embodiment is an example in which a brush having an octagonal cross section is used as the brush 12 in a configuration similar to that of the first embodiment. When the brush 12 having an octagonal cross section is used, the maximum width d of the brush cross section and the center C of the brush are located as shown in FIG.
[0036]
FIG. 4 shows an example of a toothbrush configured by applying the present invention. (A) is a figure which shows the shape of the flocking hole formed in the head part, and its arrangement pattern, (b) (c) is a schematic enlarged plan view and a cross-sectional view of a bristle bundle part which is flourishing in a conventional manner, (d) and (e) are a schematic enlarged plan view and a cross-sectional view of a hair bundle portion planted according to the present invention.
[0037]
In the example of FIG. 4, as shown in FIG. 4A, a circular flocking hole 16 is disposed near the center of the flocking surface of the head portion 15, and the circular flocking hole 16 is formed around the flocking surface. Is arranged so that the long side thereof is perpendicular to the longitudinal direction of the toothbrush handle, and the circular flocking hole 16 near the center is provided with (b) and (c). As shown in the figure, a plurality of brushes 17 are implanted in a conventional manner in two folds by a flat wire 18 and a plurality of brushes 17 are formed in a rectangular implanted hole 13 in the outer peripheral portion, as shown in (d) and (e). The brushes 12 are planted in the form of the present invention such that the brushes 12 are arranged in a line along the flat line 14. In this way, if a hair bundle of the conventional type is planted in the vicinity of the center of the head portion and the hair bundle of the type of the present invention is arranged so as to surround the periphery thereof, it becomes more preferable from the viewpoint of brushing feeling and distinctive appearance. .
[0038]
(Experimental example)
Using the toothbrush of the present invention and a conventional toothbrush, the flocking strength was measured and the sensory evaluation was performed. The results are shown below.
[0039]
1. Flocking strength (strength of single hair removal)
One brush brushed in the flocked hole was grasped with a special device, and the maximum tensile stress until the brush came off the flocked hole was measured. Table 1 shows the results. As is clear from the table, it was confirmed that the product of the present invention significantly improved the flocking strength (strength of single hair removal) as compared with the conventional product. The measuring instrument used was an autograph manufactured by Shimadzu Corporation (tensile speed: 20 mm / min).
[0040]
[Table 1]
Figure 2004202021
[0041]
2. Flocking strength due to differences in flocked hole depth (strength of single hair removal)
One brush implanted in the flocked holes of different depths was gripped with a special device, and the maximum tensile stress until the brush came off the flocked hole was measured. Table 2 shows the results. As is evident from the table, it was confirmed that the product of the present invention significantly improved the single-hair breakage strength (vs. depth) as compared with the conventional product. The conventional product had a problem that the brush was easily pulled out if the flocked hole was shallow, but the product of the present invention was hard to pull out the brush even when it was shallow, and had excellent quality. In addition, the same measuring equipment as in Table 1 was used.
[0042]
[Table 2]
Figure 2004202021
[0043]
3. Sensory evaluation by 20 panelists using the toothbrush of the present invention having the flocked hole shape and arrangement pattern shown in FIGS. 5 to 8 and the conventional toothbrush having the flocked hole shape and arrangement pattern shown in FIGS. 9 and 10. An evaluation test was performed. Table 3 shows the results. As is clear from the table, it was proved that the product of the present invention can simultaneously satisfy all of the gingival massage effect, the interdental penetration, and the feeling of actual brushing. In each figure, a flocked hole indicated by reference numeral 13 is a flocked hole in which the brush is implanted in the above-described manner according to the present invention, and a flocked hole indicated by reference numeral 16 is a flocked hole in which the brush is implanted in the conventional type. In order to make the drawings easy to understand, the brushes implanted in the individual implanted holes are not shown.
[0044]
[Table 3]
Figure 2004202021
[0045]
The evaluation criteria for the sensory evaluation were as follows.
1. Evaluation of gingival massage ○: High gingival massage feeling な い: Neither of them ×: Low gingival massage feeling 2. Evaluation of interdental penetration ○: Good interdental penetration Δ: Neither can be determined ×: Poor interdental penetration 3. Evaluation of actual cleaning feeling 刷: High actual cleaning feeling Δ: Neither of the above ×: Low actual cleaning feeling Comprehensive evaluation △: good と も: uncertain ×: inferior
FIG. 11 shows some examples of the cross-sectional shape of the brush 12 used in the present invention. (A) is an example of a circular cross section, (b) is an example of a square cross section, (c) is an example of a chrysanthemum cross section, (d) is an example of an elliptical cross section, (e) is an example of a rectangular cross section, and (f). Is an example of a rhombic cross section, (g) is an example of a strip-shaped cross section, and (h) is an example of a beam-shaped cross section. In each brush cross section, the maximum width d of the brush cross section and the center C of the brush are located as shown in the figure.
[0047]
【The invention's effect】
As described above, according to the present invention, the brushes that have been bifurcated using a flat wire are configured so as to be arranged in a line along the flat line in the flocking hole. In a toothbrush, it is possible to give an appearance distinctiveness and a feeling of use close to single flocking. In addition, it is possible to provide a toothbrush which is low in cost, has improved bristle removal strength and a thinner head portion, and has excellent operability, interdental penetration, and plaque removing function of the toothbrush.
[Brief description of the drawings]
1A and 1B show a first embodiment of the present invention, in which FIG. 1A is a schematic perspective view of a hair bundle implanted using a flat wire, FIG. 1B is an enlarged schematic plan view thereof, and FIG. FIG. 3 is a cross-sectional view of a brush constituting a hair bundle.
FIGS. 2A and 2B show a second embodiment of the present invention, wherein FIG. 2A is a schematic plan view of a flocked hole portion planted using a flat line, and FIG. FIG.
FIGS. 3A and 3B show a third embodiment of the present invention, in which FIG. 3A is a schematic enlarged plan view of a flocked hole portion planted using a flat line, and FIG. It is sectional drawing.
4A and 4B show a toothbrush constructed by applying the present invention, wherein FIG. 4A shows the shape and arrangement pattern of flocking holes formed in a head portion, and FIG. FIG. 5C is a schematic enlarged cross-sectional view of a flocking hole portion planted in a conventional manner, and FIG. 5D is a schematic enlarged enlarged plan view of a flocking hole portion planted in the present invention. (E) is a schematic enlarged sectional view of a flocked hole portion planted according to the present invention.
FIGS. 5A and 5B show a first embodiment (product 1 of the present invention) of the toothbrush of the present invention used in the sensory evaluation test, wherein FIG. 5A is a schematic plan view of a head portion, and FIG. It is a schematic plan view which shows the direction of a flat line.
FIG. 6 shows a second embodiment of the toothbrush of the present invention (product 2 of the present invention) used in a sensory evaluation test. FIG. 6A is a schematic plan view of a head portion, and FIG. It is a schematic plan view which shows the direction of a flat line.
FIG. 7 shows a third embodiment of the toothbrush of the present invention (product 3 of the present invention) used in a sensory evaluation test, wherein FIG. 7A is a schematic plan view of a head portion, and FIG. It is a schematic plan view which shows the direction of a flat line.
8 shows a fourth embodiment of the toothbrush of the present invention (product 4 of the present invention) used in a sensory evaluation test, wherein FIG. 8A is a schematic plan view of a head portion, and FIG. It is a schematic plan view which shows the direction of a flat line.
FIG. 9 shows a first example (conventional product 1) of a conventional toothbrush used for a sensory evaluation test. It is a schematic plan view which shows a direction.
FIG. 10 shows a second example (conventional product 2) of a conventional toothbrush used for a sensory evaluation test. It is a schematic plan view which shows a direction.
FIGS. 11A to 11H are diagrams illustrating examples of the cross-sectional shape of a brush used in the present invention.
[Explanation of symbols]
11 hair bundle 12 brush 13 flocking hole 14 flat wire 15 head part 16 flocking hole (conventional type)
17 brush (conventional type)
18 Flat wire (conventional type)

Claims (2)

複数本の刷毛を束ねた毛束を平線によって二つ折りにして打ち込むことにより植毛穴に固定した歯ブラシにおいて、植毛される刷毛断面の最大幅をd、該最大幅dの中点位置を刷毛の中心Cとするとき、平線から最も離れた刷毛の中心Cと平線との距離LがL≦1.5×dの範囲であることを特徴とする歯ブラシ。In a toothbrush fixed to a flocked hole by bunching a bunch of a plurality of brushes into two along a flat line and driving it into the flocked hole, the maximum width of the brush cross section to be brushed is d, and the midpoint position of the maximum width d is the brush position. A toothbrush wherein a distance L between the center C of the brush furthest from the flat line and the flat line is L ≦ 1.5 × d. 植毛穴に固定された刷毛が平線に沿って一列に並んでいることを特徴とする請求項1記載の歯ブラシ。The toothbrush according to claim 1, wherein the brushes fixed to the flocked holes are arranged in a line along a flat line.
JP2002376091A 2002-12-26 2002-12-26 Toothbrush Pending JP2004202021A (en)

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