JP3891513B2 - Tips for writing instruments or applicators - Google Patents

Tips for writing instruments or applicators Download PDF

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Publication number
JP3891513B2
JP3891513B2 JP16052297A JP16052297A JP3891513B2 JP 3891513 B2 JP3891513 B2 JP 3891513B2 JP 16052297 A JP16052297 A JP 16052297A JP 16052297 A JP16052297 A JP 16052297A JP 3891513 B2 JP3891513 B2 JP 3891513B2
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Japan
Prior art keywords
ball
tip
writing
ink
handwriting
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Expired - Fee Related
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JP16052297A
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Japanese (ja)
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JPH10329473A (en
Inventor
晃一 高山
かほり 船橋
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Pilot Corp KK
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Pilot Corp KK
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Description

【0001】
【発明の属する技術分野】
本発明は、筆記具の筆記先端部として、または塗布具の塗布先端部として、ボールをチップ先端部に回転可能に抱持した筆記具用又は塗布具用チップに関する。
【0002】
【従来の技術】
従来より、ボールをチップ先端部に回転可能に抱持した筆記具用又は塗布具用チップとして、チップ本体にボール抱持室を形成し、該ボール抱持室にボールを回転可能に抱持した、あるいは細管の先端内部にボールを回転可能に抱持した細管式の構造のものは知られている。
【0003】
筆記具用又は塗布具用チップに関しては、ボールペンや塗布具として装着して筆記または塗布した際に、筆跡に線かすれや線切れまたは塗布むらが起きないように、良好なインキ性能(インキ流出量)が得られるようにと、その形状などについて、従来より多数の提案がなされている。例えば、実開平7−31382号の公報により、ボールペンチップのボールハウス径とボール径との関係を特定した「ボールペン」や、特開平8−207482号の公報により、インク誘導孔径とボール径の関係、インク誘導孔長さとインク誘導孔径との関係を特定した「ボールペン用金属チップ」等がある。
【0004】
ところで、ボールについては、ボールの摩耗を対策として、あるいは筆感を向上するなどの目的からボールの材質に関する提案はなされているが、それ以外ではボール自体に関する提案はなされていない。
【0005】
【発明が解決しようとする課題】
従来より、外径が1.2mm未満のボールを用いて多数のボールペンチップを製造し、それらを装着してボールペン等として多数提供してきている。そうした中で、現実問題として、同構造・同寸法のボールペンチップを装着したボールペンにおいて、筆跡に線かすれや線切れまたはぼて等が発生するものが出現するという問題があった。
【0006】
本発明者達は、こうした問題を解明すべく検討した。ボールに着目し、良好な筆跡が得られたボールペンチップのボールと、筆跡に線かすれや線切れ等が生じたボールペンチップのボールについて、種々検討したところ、ボールへのインキの乗りすなわちボールのインキに対する濡れ性にバラツキがあることを知見した。ボールのインキに対する濡れ性は、ボールの表面粗さに左右され、ボールの表面粗さを特定することにより前記問題を解決できることが判り、本発明に至った。
【0007】
【課題を解決するための手段】
本発明は上記問題を解消するために、油性インキに用いる筆記具用又は塗布具用チップにおいて、外径が1.2mm未満で、算術平均粗さ(Ra)が0.004μm〜0.010μmであって、最大高さ(Ry)が0.15μmを越えない表面粗さであるタングステンカーバイト系超硬材で形成したボールを、チップ先端部に回転可能に抱持するものである。
【0008】
算術平均粗さ(Ra)とは、表面粗さ測定機(Rank Taylor Hobson社製の機種名:Form-Talysurf-S1F-50)により測定された粗さ曲線から、その平均線の方向に基準長さLだけ抜き取り、この抜き取り部分の平均線から測定曲線までの偏差の絶対値を合計し、平均した値である。
【0009】
【式1】

Figure 0003891513
【0010】
最大高さ(Ry)とは、粗さ曲線から、その平均線の方向に基準長さLだけ抜き取り、この抜き取り部分の平均線から最も高い山頂までの高さ(Yp)と最も低い谷底までの深さ(Yv)との和である。
Ry=Yp+Yv
【0011】
タングステンカーバイト系超硬材で形成したボールの筆記用又は塗布用の油性インキ(以下、単に「インキ」と言う。)に対する濡れ性は、算術平均粗さ(Ra)を特定することによりほぼ決まるが、その値が0.010μmより大きいと、ボールへのインキの濡れ性が大きすぎインキの付着量が多くなる傾向となり、筆跡にぼてが生じやすくなる。また、0.004μm以下では、筆記具においてはボールに対するインキの濡れ性が不十分となり、筆記時に筆跡が線かすれや線切れが生じやすくなり、算術平均粗さ(Ra)は、0.004μm〜0.010μmが好適となる。
【0012】
ところで、いくら算術平均粗さ(Ra)が前記範囲内にはいっていても、最大高さ(Ry)の値が大きい場合には、他の平均線から測定曲線までの偏差の絶対値の合計が低い場合があり、ボールのインキに対する濡れ性が良いとは言えない場合がある。また、値が大きすぎる場合は、傷であり許されるべきものではない。従って、最大高さ(Ry)の値は、0.15μmを越えてはならない。
【0013】
【発明の実施の形態】
本発明は、算術平均粗さ(Ra)が0.004μm〜0.010μmであって、最大高さ(Ry)が0.15μmを越えない表面粗さである、外径が1.2mm未満のタングステンカーバイト系超硬材で形成したボールを、チップ本体にボール抱持室とボール座を形成したチップ先端部に回転可能に抱持して、油性インキに用いる筆記具用又は塗布具用チップを形成する。
【0014】
チップ先端部の構造としては、ボール座を有さず、ボールをスプリングで直接にまたは可動子を介してチップ先端縁部側に押圧した構造であっても良い。また、チップ本体をパイプで構成し、ボールの後端を繊維束等の棒状体や針体で保持した、あるいはパイプの壁面を半径方向に凹ませて得られる突起部により保持したチップ構造であっても良い。
【0015】
【実施例】
ボール径(D)が0.7mmで、算術平均粗さ(Ra)および最大高さ(Ry)が表1に示すような値のボールを用いて、前述した実施の形態に基づいて各ボールペンチップを作製した。本発明の寸法関係に該当するものを実施例とし、そうでないものを比較例として通し番号を付した。
【0016】
【表1】
Figure 0003891513
【0017】
各ボールペンチップを、当社で市販している油性インキボールペンのレフィールに挿着し、油性インキボールペンとして作製し、この各油性インキボールペンを、走行試験機により、次の要領で試験及び評価をおこなった。
【0018】
試験方法:筆記角度70度、荷重200g、筆記速度4m/min の諸条件下
で、100mのらせん書きを行ない、筆跡状態を目視観察した。
評価:筆跡に線かすれや線切れおよびぼてがないもの・・・・・・・・・○
筆跡に線かすれや線切れ、またはぼてがあるもの・・・・・・・・×
【0019】
その結果は、表1に示すとおりである。
【0020】
比較例1に示すように、ボールの算術平均粗さ(Ra)の値が低すぎるものは、筆跡に線かすれが生じた。
【0021】
比較例2に示すように、ボールの算術平均粗さ(Ra)の値が高すぎるものは、筆跡にぼてが生じた。
【0022】
【発明の効果】
本発明の筆記具用又は塗布具用チップは前述したような構成なので、同構造・同寸法のチップを装着したボールペンや塗布具においては、筆跡に線かすれや線切れやぼてがなく、または塗布むらがなく、全てのものがほぼ同様の安定したインキ出性能を確保することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a writing instrument or applicator tip in which a ball is rotatably held at a tip end of a writing instrument as a writing tip or an application tip of an applicator.
[0002]
[Prior art]
Conventionally, a ball holding chamber was formed in the chip body as a writing instrument or applicator chip that rotatably held the ball at the tip of the chip, and the ball was rotatably held in the ball holding chamber. Or the thing of the thin tube type structure which hold | maintained the ball | bowl rotatably inside the front-end | tip of a thin tube is known.
[0003]
With regard to writing tool or applicator tips, good ink performance (ink spillage) so that when writing or applying as a ballpoint pen or applicator, writing or application does not cause line blurring, line breaks, or uneven application. As a result, many proposals have been made regarding the shape and the like. For example, “Ball Pen” that specifies the relationship between the ball house diameter of the ball-point pen tip and the ball diameter according to Japanese Utility Model Publication No. 7-31382, and the relationship between the ink guide hole diameter and the ball diameter according to Japanese Patent Application Laid-Open No. 8-207482. There is a “ball tip metal tip” that specifies the relationship between the ink guide hole length and the ink guide hole diameter.
[0004]
By the way, with respect to the ball, proposals have been made regarding the material of the ball for the purpose of taking measures against wear of the ball or improving the writing feeling, but no proposal has been made regarding the ball itself.
[0005]
[Problems to be solved by the invention]
Conventionally, many ball-point pen tips are manufactured using balls having an outer diameter of less than 1.2 mm, and a large number of ball-point pens are provided by mounting them. Under such circumstances, as a real problem, there has been a problem that, in a ballpoint pen equipped with a ballpoint pen tip having the same structure and the same size, a handwriting with broken lines, broken lines, or blurs appears.
[0006]
The present inventors have studied to elucidate these problems. Focusing on the ball, we examined various things about the ball-point pen tip ball with good handwriting and the ball-point pen tip ball with handwriting and line breakage. It was found that there was a variation in the wettability with respect to. The wettability of the ball with respect to the ink depends on the surface roughness of the ball, and it has been found that the above problem can be solved by specifying the surface roughness of the ball.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a writing instrument or applicator chip used for oil-based inks having an outer diameter of less than 1.2 mm and an arithmetic average roughness (Ra) of 0.004 μm to 0.010 μm . Thus, a ball formed of a tungsten carbide cemented carbide having a surface roughness not exceeding 0.15 μm in the maximum height (Ry) is rotatably held at the tip of the chip.
[0008]
Arithmetic mean roughness (Ra) is a reference length in the direction of the mean line from the roughness curve measured by a surface roughness measuring instrument (Model name: Form-Talysurf-S1F-50 manufactured by Rank Taylor Hobson) This is a value obtained by summing the absolute values of deviations from the average line of the extracted part to the measurement curve, and extracting the length L.
[0009]
[Formula 1]
Figure 0003891513
[0010]
The maximum height (Ry) is extracted from the roughness curve by the reference length L in the direction of the average line, and the height (Yp) from the average line of this extracted part to the highest peak (Yp) and the lowest valley bottom It is the sum of the depth (Yv).
Ry = Yp + Yv
[0011]
The wettability of a ball formed of tungsten carbide cemented carbide to oil-based ink for writing or coating (hereinafter simply referred to as “ink” ) is substantially determined by specifying the arithmetic average roughness (Ra). However, when the value is larger than 0.010 μm, the wettability of the ink to the ball is too large, and the amount of ink attached tends to increase, and the handwriting tends to be blurred. In addition, if it is 0.004 μm or less, the ink has insufficient wettability with respect to the ball in writing instruments, and the handwriting tends to be blurred or broken at the time of writing, and the arithmetic average roughness (Ra) is 0.004 μm. ˜0.010 μm is suitable.
[0012]
By the way, even if the arithmetic average roughness (Ra) is within the above range, if the value of the maximum height (Ry) is large, the sum of absolute values of deviations from other average lines to the measurement curve is It may be low, and the wettability of the ball to the ink may not be good. If the value is too large, it is a flaw and should not be allowed. Therefore, the value of the maximum height (Ry) must not exceed 0.15 μm.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the arithmetic average roughness (Ra) is 0.004 μm to 0.010 μm , and the maximum height (Ry) is a surface roughness not exceeding 0.15 μm. The outer diameter is less than 1.2 mm. of the motor ring stainless carbide-based ball formed by cemented carbide, and embracing rotatably to the tip end portion forming a ball holding chamber and the ball seat in the chip body, for writing instruments or applicator used in oil-based ink A chip is formed.
[0014]
The structure of the tip end portion may be a structure in which the ball is not provided and the ball is pressed to the tip end edge side directly by a spring or via a mover. In addition, the tip body is constituted by a pipe and the tip end of the ball is held by a rod-like body such as a fiber bundle or a needle body, or is held by a protrusion obtained by denting the wall surface of the pipe in the radial direction. May be.
[0015]
【Example】
Each ball-point pen tip is based on the embodiment described above, using balls having a ball diameter (D) of 0.7 mm and arithmetic mean roughness (Ra) and maximum height (Ry) as shown in Table 1. Was made. Examples that correspond to the dimensional relationship of the present invention are given as examples, and those that are not are given serial numbers as comparative examples.
[0016]
[Table 1]
Figure 0003891513
[0017]
Each ball-point pen tip was inserted into the refill of an oil-based ink ball-point pen marketed by our company and produced as an oil-based ink ball-point pen. Each oil-based ink ball-point pen was tested and evaluated in the following manner using a running tester. .
[0018]
Test method: Under various conditions of a writing angle of 70 degrees, a load of 200 g, and a writing speed of 4 m / min, 100 m of spiral writing was performed, and the handwriting state was visually observed.
Evaluation: There is no blurring or broken lines in the handwriting.
The handwriting has blurred lines, broken lines, or spots ...
[0019]
The results are as shown in Table 1.
[0020]
As shown in Comparative Example 1, when the arithmetic average roughness (Ra) of the ball was too low, the handwriting was blurred.
[0021]
As shown in Comparative Example 2, when the arithmetic average roughness (Ra) of the ball was too high, the handwriting was blurred.
[0022]
【The invention's effect】
Since the tip for a writing instrument or applicator of the present invention is configured as described above, in a ballpoint pen or applicator equipped with a tip having the same structure and dimensions, there is no blurring, broken lines, or blur in the handwriting. There is no unevenness, and all can secure the same stable ink discharging performance.

Claims (1)

外径が1.2mm未満で、算術平均粗さ(Ra)が0.004μm〜0.010μmであって、最大高さ(Ry)が0.15μmを越えない表面粗さであるタングステンカーバイト系超硬材で形成したボールを、チップ先端部に回転可能に抱持したことを特徴とする、油性インキに用いる筆記具用又は塗布具用チップ。 Tungsten carbide having an outer diameter of less than 1.2 mm, an arithmetic average roughness (Ra) of 0.004 μm to 0.010 μm , and a maximum height (Ry) not exceeding 0.15 μm the ball formed in the system superhard material, characterized rotatably it has holding the chip tip for writing instruments or applicator tip used in the oil-based ink.
JP16052297A 1997-06-03 1997-06-03 Tips for writing instruments or applicators Expired - Fee Related JP3891513B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16052297A JP3891513B2 (en) 1997-06-03 1997-06-03 Tips for writing instruments or applicators

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16052297A JP3891513B2 (en) 1997-06-03 1997-06-03 Tips for writing instruments or applicators

Publications (2)

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JPH10329473A JPH10329473A (en) 1998-12-15
JP3891513B2 true JP3891513B2 (en) 2007-03-14

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4309104B2 (en) 2002-08-14 2009-08-05 株式会社ツバキ・ナカシマ Ball for ballpoint pen
JP4690662B2 (en) * 2004-04-26 2011-06-01 株式会社パイロットコーポレーション Water-based ballpoint pen
JP2007176170A (en) * 2005-11-30 2007-07-12 Pentel Corp Ballpoint pen ball and manufacturing method thereof
JP6286254B2 (en) * 2014-03-31 2018-02-28 株式会社パイロットコーポレーション Ink composition for oil-based ballpoint pen, oil-based ballpoint pen refill using the same, and oil-based ballpoint pen

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