JPH0630991B2 - Discolored core - Google Patents
Discolored coreInfo
- Publication number
- JPH0630991B2 JPH0630991B2 JP12283884A JP12283884A JPH0630991B2 JP H0630991 B2 JPH0630991 B2 JP H0630991B2 JP 12283884 A JP12283884 A JP 12283884A JP 12283884 A JP12283884 A JP 12283884A JP H0630991 B2 JPH0630991 B2 JP H0630991B2
- Authority
- JP
- Japan
- Prior art keywords
- ink
- core
- black
- handwriting
- sintered body
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 この発明は、黒色筆記線を消ゴムで消去することによ
り、他の色の筆記線が現われるという特徴を有する変色
芯に関するものであつて、消ゴムを使用することにより
筆記線の色が変わるという思想は全く新規のものであ
り、その要旨は、紙面上には黒色粉末の筆記線があり、
紙面内部にはインクが浸み込み、紙面上の黒色粉末を消
ゴムで消去することにより、紙面内のインクの筆跡があ
らわれるものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color-changing core having a feature that writing lines of other colors appear by erasing black writing lines with an eraser. The idea of changing the color of is completely new, and the gist is that there is a writing line of black powder on the paper,
The ink soaks into the paper surface, and the black powder on the paper surface is erased with an eraser, whereby the handwriting of the ink on the paper surface appears.
従来、筆記具としては鉛筆、シヤープペンシルのような
固形筆記体を用いるもの、万年筆、サインペン、ボール
ペン等のインクを用いる液体筆記具が知られている。こ
れらはそれぞれ個有の特徴を有しているが、大別すると
前者の固形筆記体の筆跡は消ゴムを用いて消去できるの
に対し、後者のインクの筆跡は消ゴムを用いても消去不
能であつて、この発明のような固形筆記体とインクとを
組みあわせ、固形筆記体の筆跡を消ゴムにより消去し、
インクの筆跡をあらわしめ、変色させるという思想はな
かつた。Conventionally, as a writing instrument, a solid writing instrument such as a pencil or a sharp pencil, and a liquid writing instrument using ink such as a fountain pen, a felt-tip pen, and a ballpoint pen are known. Each of these has its own characteristics.Broadly speaking, while the handwriting of the solid writing system of the former can be erased with an eraser, the handwriting of the latter ink cannot be erased even with an eraser. Then, by combining the solid writing material and the ink as in the present invention, the handwriting of the solid writing material is erased by an eraser,
I never thought of expressing the handwriting of ink and causing it to change color.
鉛芯中にインクを含浸する従来例としては、特公昭21
−3194のようなアカダツクを主材とし之に粘土及び
カーボンブラツクを加へ成形焼成しオイルブラツク染料
及超微粉子カーボンブラツクを吸収浸潤せしむるトレー
ス用鉛筆芯製造方法があり、黒色焼結体の気孔内に黒色
インクを含浸させ、筆跡の黒色を一層増長することを目
的としており、この発明のように黒色焼結体の中に有色
インクを含浸して変色芯を得る目的のものではない。As a conventional example of impregnating a lead core with ink, Japanese Patent Publication No.
There is a method for producing a pencil lead for tracing, in which clay and carbon black are used as the main material such as -3194, and the clay and carbon black are additionally molded and burned to absorb and infiltrate the oil black dye and the ultrafine powder carbon black. The purpose is to further impregnate the black ink in the pores with black ink to further increase the black color of the handwriting, and not to obtain the discolored core by impregnating the colored ink into the black sintered body as in the present invention. .
また特公昭49−34045のように耐火粉末と粘結剤
との混合物からなる棒状の多孔性焼成体にインクを含浸
させたことを特徴とするエンピツ芯がある。In addition, there is a pencil lead, which is obtained by impregnating a rod-shaped porous fired body made of a mixture of refractory powder and a binder with ink, as in JP-B-49-34045.
この中で耐火粉末とは白色ですべりやすい窒化ほう素粉
末やタルク粉末のことで、粘結剤とはベントナイト等の
白色粘土のことであり、耐火粉末と粘結剤との混合物か
らなる棒状の多孔性焼成体は白色系の色相をしており、
これにインクを含浸して白色系の焼成体を染着し、任意
の色相を得る色エンピツ芯であつて、その筆跡は消ゴム
で消去でき、この発明のように有色インクを紙面に吸収
させ紙面上の黒色粉末を消ゴムで除去することにより、
黒い筆跡から消ゴムで消去できない有色インクの色へと
変色させる芯とは異る。Among them, the refractory powder is a white and slippery boron nitride powder or talc powder, and the binder is white clay such as bentonite, which is a rod-shaped mixture of the refractory powder and the binder. The porous fired body has a white hue,
It is a colored pencil core that is impregnated with ink to dye a white fired body to obtain an arbitrary hue, and the handwriting can be erased with an eraser. As in the present invention, the colored ink is absorbed on the paper surface. By removing the black powder above with an eraser,
It is different from the core that changes color from black handwriting to colored ink that cannot be erased with an eraser.
すなわちこの発明は炭素を結合剤とする多孔性黒色焼結
体と多孔性黒色焼結体の気孔内に充填されてる黒色を除
く有色インクとから構成され、インクは湿潤性溶剤を主
成分とし、これに可溶する染料とからなることを特徴と
する芯に関するものである。That is, the present invention is composed of a porous black sintered body using carbon as a binder and a colored ink excluding black filled in the pores of the porous black sintered body, the ink containing a wettable solvent as a main component, The present invention relates to a core comprising a dye soluble in the core.
この発明に用いられる焼結体は炭素を結合材とし、この
焼結体はこの炭素が黒色をしていることにより強い着色
力を有する。またこの焼結体は液体を含浸できる気孔を
有し、気孔の割合(気孔率)によつて焼結体の気孔内に
充填されるインク量が決定される。The sintered body used in the present invention uses carbon as a binder, and the sintered body has a strong coloring power because the carbon is black. Further, this sintered body has pores that can be impregnated with a liquid, and the amount of ink filled in the pores of the sintered body is determined by the proportion of the pores (porosity).
この黒色焼結体の気孔率は20〜70%の範囲であるこ
とが好ましい。気孔率が20%未満の場合には黒色焼結
体に充填されるインク量が少なすぎて、充填するインク
に種々の検討を加えても、有色インクの発色が極めて微
弱で、変色芯として機能しない。The porosity of this black sintered body is preferably in the range of 20 to 70%. If the porosity is less than 20%, the amount of ink filled in the black sintered body is too small, and even if various examinations are performed on the filled ink, the color of the colored ink is extremely weak and functions as a color change core. do not do.
また気孔率が70%を超える場合は、あまりにも気孔が
多いために、焼結体が脆く固形筆記体の芯として使用し
た場合には折れ易い。Further, when the porosity exceeds 70%, the sintered body is fragile because it has too many pores and is easily broken when used as a core of a solid writing material.
この発明における気孔率の測定は、浸透性の良い液体
(たとえばベンジルアルコール)を鉛芯の気孔に吸収さ
せ、吸収させた液体の容量を鉛芯の嵩容積で除し、百分
率で表わしたものである。In the present invention, the porosity is measured by absorbing a liquid having good permeability (for example, benzyl alcohol) into the pores of the lead core, dividing the volume of the absorbed liquid by the bulk volume of the lead core, and expressing it as a percentage. is there.
但しW1は液体を吸収させる前の鉛芯の乾燥重量。 However, W 1 is the dry weight of the lead core before absorbing the liquid.
W2は気孔中に液体を吸収させた鉛芯のその液体中にお
ける重量。W 2 is the weight of the lead core in which the liquid is absorbed in the pores in the liquid.
W3は液体を鉛芯の気孔中に吸収させたのちの鉛芯の重
量。W 3 is the weight of the lead core after the liquid is absorbed in the pores of the lead core.
この発明に用いられるインクは湿潤性溶剤を主成分と
し、これに可溶する染料とから成り、インクの染料濃度
が15%以上であるものが好ましい。The ink used in the present invention preferably contains a wettable solvent as a main component and a dye soluble in the wettable solvent, and preferably has a dye concentration of 15% or more.
すなわち、通常の万年筆やサインペンのような液体筆記
具では染料濃度が5%以下のインクであつてもインクタ
ンクからインクが十分に供給されることにより、鮮明な
筆跡が得られるのに対して、この発明の芯は前述のよう
に焼結体に充填されるインク量に限りがあり、固形筆記
体が筆記された際の摩耗量に内在するインク量で発色し
なければ変色芯として機能しない。That is, in a liquid writing instrument such as a normal fountain pen or a felt-tip pen, even if the ink has a dye concentration of 5% or less, a clear handwriting can be obtained by sufficiently supplying the ink from the ink tank. As described above, the core of the invention has a limited amount of ink to be filled in the sintered body, and does not function as a color-changing core unless color is developed with the amount of ink inherent in the amount of wear when the solid writing body is written.
つまり少量のインクで十分な発色を得ることを鋭意検討
した結果、インクの染料濃度が15%以上で、染料の溶
剤として湿潤性を有するものが好結果が得られることを
見い出した。That is, as a result of earnest studies to obtain sufficient color development with a small amount of ink, it was found that good results can be obtained when the dye concentration of the ink is 15% or more and the solvent of the dye has wettability.
インクの着色力の根源である染料の濃度を増すことは強
い発色のインクを得ることの必要条件ではあるが、染料
濃度を増すのみでは溶剤の量が不足するためにインクと
しての粘度が上昇し、固形筆記体との粘着力が強くなつ
て筆跡から紙面へのインクの移行が防げられて、逆に変
色芯としての効果が減退してしまう。Increasing the concentration of the dye, which is the source of the coloring power of the ink, is a necessary condition for obtaining a strongly colored ink, but increasing the dye concentration alone increases the viscosity of the ink because the amount of solvent is insufficient. In addition, the adhesiveness with the solid writing material is increased to prevent the transfer of ink from the handwriting to the paper surface, and conversely, the effect as a discoloration core is diminished.
このために本発明者はは固形筆記体内の染料濃度を15
%以上に依持しながら溶剤に湿潤性を有するものを選定
し、筆記後に水分を紙や空気中から補うことを考案し、
これにより変色芯として満足するインクが得られた。For this reason, the inventor has set the dye concentration in the solid writing body to 15
% We selected one that has a wettability to the solvent while keeping it above 100%, and devised to supplement the moisture from the paper or the air after writing,
As a result, an ink having a satisfactory color change core was obtained.
この効果については定かではないが、筆記される紙は植
物繊維を水の方便でからみあわせて層状としてものであ
り、植物繊維の結合力は水結合によるものとされてお
り、通常4〜5%の水分を含んでいる。Although this effect is not clear, the written paper is a layer of plant fibers entangled with water, and the binding force of the plant fibers is said to be due to water binding, usually 4 to 5%. Contains water.
この発明のインクは湿潤性の溶剤を使用しているために
紙に含まれる水分と筆跡に含まれるインクとの相互移行
が円滑に行なわれるとともに、さらに空気中から水分の
補給を受け、筆跡に対して十分なインク量となつて良好
な有色インクの発色が得られているものと思われる。Since the ink of the present invention uses a wettable solvent, the water contained in the paper and the ink contained in the handwriting can be smoothly transferred to each other, and the water is replenished from the air to make the handwriting. On the other hand, it is considered that the coloring of a good colored ink was obtained with a sufficient ink amount.
ここで用いられる湿潤性の溶剤としてエチレングリコー
ル、ジエチレングリコール、トリエチレングリコール、
プロピレングリコール、ポリエチレングリコール等のグ
リコール類やグリセリンが吸湿性が大で好ましく、エチ
レングリコールエチルエーテル、エチレングリコールフ
エニルエーテル、エチレングリコールベンジルエーテ
ル、トリエチレングリコールフエニルエーテル、トリエ
チレングリコールベンジルエーテル等のグリコールエー
テル類は吸湿性はグリコール類には劣るが、湿潤性の溶
剤として一部添加してもよい。As the wettable solvent used here, ethylene glycol, diethylene glycol, triethylene glycol,
Glycerin such as propylene glycol and polyethylene glycol and glycerin are preferable because they have high hygroscopicity, and glycols such as ethylene glycol ethyl ether, ethylene glycol phenyl ether, ethylene glycol benzyl ether, triethylene glycol phenyl ether, and triethylene glycol benzyl ether. Ethers are inferior in hygroscopicity to glycols, but may be partially added as a wettable solvent.
また湿潤性溶剤の中でも沸点200℃以上のものを用い
たインクが変色芯の経時安定性に優れており好ましい。Further, among the wettable solvents, an ink having a boiling point of 200 ° C. or higher is preferable because the color-changing core has excellent stability over time.
一方、有色インクに用いられる染料は、前述の湿潤性溶
剤に可溶な染料であれば何んでもよいが特に塩基性染料
が着色力に優れ、水溶性染料および酒精溶性染料は変色
芯で筆記した筆跡から紙面への転写力に優れており好ま
しい。On the other hand, the dye used in the colored ink may be any dye that is soluble in the above-mentioned wetting solvent, but especially the basic dye is excellent in coloring power, and the water-soluble dye and the alcohol-soluble dye are written with a discoloring core. It is preferable because it is excellent in the transfer power from the written handwriting to the paper surface.
次に、この発明の変色芯の製造法について簡単に述べ
る。黒鉛あるいは窒化硼素等の潤滑材と、焼成して炭素
化する有機化合物を任意の溶剤または加熱することによ
り、溶解あるいは溶融し、三本ロールやニーダーを用い
て混練、押出成形したのち、不活性ガス中で1000℃
前後の高温で焼成し、有機化合物を炭素化させて、潤滑
材と炭素の結合材とから成る多孔性黒色焼結体を得る。Next, the manufacturing method of the discolored core of the present invention will be briefly described. Lubricant such as graphite or boron nitride, and an organic compound that is carbonized by firing are melted or melted by heating with any solvent, kneading using a three-roll or kneader, extrusion molding, then inert 1000 ° C in gas
It is fired at a high temperature before and after to carbonize the organic compound to obtain a porous black sintered body composed of a lubricant and a carbon binder.
ここで使用される有機化合物としては天然樹脂、合成樹
脂、アスフアルト、コールタールピツチ等を単独もしく
は組みあわせたものが用いられる。As the organic compound used here, natural resin, synthetic resin, asphalt, coal tar pitch or the like may be used alone or in combination.
一方、有色インクの調合としては湿潤性溶剤にこれと可
溶し目的の色相であるところの染料を加えて攪拌し、場
合によつては加温して溶解する。On the other hand, in the preparation of the colored ink, a dye which is soluble in the wetting solvent and has a desired hue is added and stirred, and in some cases heated to dissolve.
この有色インクの中に多孔性黒色焼結体を一定時間浸漬
して、多孔性黒色焼結体の気孔中に有色インクを充填し
て変色芯とする。The porous black sintered body is dipped in this colored ink for a certain period of time, and the colored ink is filled in the pores of the porous black sintered body to form a color-changing core.
次にこの発明の実施例を述べる。(部は重量部であ
る。) 〔実施例1〕 黒鉛を50部とブローンアスフアルト#20〜30を5
0部とを加熱混練し、押出成形したのち不活性ガス中で
常温〜1100℃まで100℃/hrで昇温し、110
0℃で1時間焼成して黒鉛と炭素から成る多孔性黒色焼
結体を得た。この多孔性黒色焼結体の気孔率は32%で
あつた。Next, examples of the present invention will be described. (Parts are parts by weight.) [Example 1] 50 parts of graphite and 5 of blown asphalt # 20 to 30 were used.
0 parts are kneaded by heating, extrusion-molded, then heated in an inert gas from room temperature to 1100 ° C. at 100 ° C./hr, and 110
The porous black sintered body composed of graphite and carbon was obtained by firing at 0 ° C. for 1 hour. The porosity of this porous black sintered body was 32%.
一方、有色インクの調合は、トリエチレングリコールを
80部に塩基性染料であるSWT−R4(保土谷化学工
業社製)20部を加え、よく攪拌して溶解し、湿潤性の
赤色インクを得た。On the other hand, the color ink was prepared by adding 20 parts of SWT-R4 (manufactured by Hodogaya Chemical Industry Co., Ltd.), which is a basic dye, to 80 parts of triethylene glycol and thoroughly stirring to dissolve it to obtain a wet red ink. It was
この湿潤性の赤色インクの中に前述の多孔性黒色焼結体
を3時間浸漬して、多孔性黒色焼結体の気孔中に湿潤性
の赤色インクを充填して変色芯とした。The porous black sintered body was dipped in the wet red ink for 3 hours, and the wet red ink was filled in the pores of the porous black sintered body to obtain a discolored core.
〔実施例2〕 トリエチレングリコールを60部とエチレングリコール
フエニルエーテルを20部に酒精溶性造塩型染料である
ローダミンベースFB(BASF社製)20部を加え、
よく攪拌して溶解し、湿潤性のピンク色のインクを得
た。Example 2 To 60 parts of triethylene glycol and 20 parts of ethylene glycol phenyl ether, 20 parts of rhodamine base FB (manufactured by BASF), which is a salt-dissolving salt-forming dye, was added.
It was well stirred and dissolved to obtain a wet pink ink.
この湿潤性のピンク色のインクの中に、実施例1と同じ
多孔性黒色焼結体を2時間浸漬して、多孔性黒色焼結体
の気孔中に湿潤性のピンク色のインクを充填して変色芯
とした。The same porous black sinter as in Example 1 was immersed in this wet pink ink for 2 hours to fill the pores of the porous black sinter with the wet pink ink. And made it a discolored core.
〔実施例3〕 プロピレングリコールを55部とエチレングリコールベ
ンジルエーテルを30部に塩基性染料であるSWT−B
5(保土谷化学工業社製)15部を加え、よく攪拌して
溶解し、湿潤性の青色インクを得た。[Example 3] 55 parts of propylene glycol and 30 parts of ethylene glycol benzyl ether were added to SWT-B which is a basic dye.
15 parts of 5 (manufactured by Hodogaya Chemical Co., Ltd.) were added and dissolved by stirring well to obtain a wet blue ink.
この湿潤性の青色インクの中に、実施例1と同じ多孔性
黒色焼結体を3時間浸漬して、多孔性黒色焼結体の気孔
中に湿潤性の青色インクを充填して変色芯とした。The same porous black sinter as in Example 1 was dipped in this wet blue ink for 3 hours to fill the pores of the porous black sinter with the wet blue ink to form a discolored core. did.
〔比較例1〕 万年筆、サインペン等に用いられる水性インクの例とし
て、水80部とグリセリン5部とエチレングリコール5
部とジエチレングリコール5部との混合溶媒に塩基性染
料であるSWT−R4(保土谷化学工業社製)5部を加
え、よく攪拌して溶解し、水性の赤色インクを得た。[Comparative Example 1] As an example of a water-based ink used for a fountain pen, a felt-tip pen, etc., 80 parts of water, 5 parts of glycerin and 5 parts of ethylene glycol were used.
5 parts of SWT-R4 (manufactured by Hodogaya Chemical Industry Co., Ltd.), which is a basic dye, was added to a mixed solvent of 5 parts of diethylene glycol and 5 parts of diethylene glycol, and well mixed by stirring to obtain an aqueous red ink.
この水性の赤色インクの中にに実施例1と同じ、多孔性
黒色焼結体を3時間浸漬して、多孔性黒色焼結体の気孔
中に水性の赤色インクを充填した。The same porous black sinter as in Example 1 was immersed in this aqueous red ink for 3 hours to fill the pores of the porous black sinter with the aqueous red ink.
〔比較例2〕 ボールペンに用いられる油性インクの例としてベンジル
アルコールを30部とオレイン酸を5部とフエニルグリ
コール25部との混合溶媒に酒精溶性造塩型染料である
ローダミンベースFB(BASF社製)25部を加え、
よく攪拌して溶解し、さらにケトン樹脂を10部とポリ
ビニルピロリドン樹脂を5部加えて油性のピンク色のイ
ンクを得た。[Comparative Example 2] As an example of an oil-based ink used for a ball-point pen, a rhodamine base FB (BASF Corp.), which is a salt-forming dye that is soluble in alcohol, is used in a mixed solvent of 30 parts of benzyl alcohol, 5 parts of oleic acid and 25 parts of phenyl glycol. 25 parts),
The mixture was thoroughly stirred and dissolved, and 10 parts of a ketone resin and 5 parts of a polyvinylpyrrolidone resin were further added to obtain an oily pink ink.
この油性のピンク色のインクを60℃に加温し、この中
に実施例1と同じ多孔性黒色焼結体を浸漬して100mm
Hgまで減圧して1時間静置して、多孔性黒色焼結体の気
孔中に油性のピンク色のインクを充填した。This oily pink ink was heated to 60 ° C., and the same porous black sintered body as in Example 1 was immersed in this ink to 100 mm.
The pressure was reduced to Hg and the mixture was allowed to stand for 1 hour to fill the pores of the porous black sintered body with an oily pink ink.
実施例1,2,3の変色芯と比較例1,2の芯をノート
用紙に筆記したところ次のような結果であつた。When the discolored cores of Examples 1, 2, and 3 and the cores of Comparative Examples 1 and 2 were written on a note paper, the following results were obtained.
実施例1の変色芯は筆記直後は通常の黒い筆跡で、消ゴ
ムで筆跡を消去すると、少し赤味の薄い筆跡が残るが、
ほぼ消去することができる。The discolored core of Example 1 is a normal black handwriting immediately after writing, and when the handwriting is erased with an eraser, a slightly reddish handwriting remains,
It can be almost erased.
約5分経過して黒い筆跡を消ゴムで消去すれば紙面への
赤色インクの転写が確認できる。After about 5 minutes, if you erase the black handwriting with an eraser, you can confirm the transfer of the red ink to the paper surface.
インクの紙への転写は、その時の湿度によつて多少異る
が数分で転写が始まり徐々にインクの発色が強くなり、
黒い筆跡を消ゴムで消去すると鮮明な赤色の筆跡が残
り、変色芯として機能した。The transfer of the ink to the paper is slightly different depending on the humidity at that time, but the transfer begins within a few minutes and the color of the ink gradually becomes stronger,
When the black handwriting was erased with an eraser, a clear red handwriting remained, functioning as a discoloration core.
実施例2の変色芯は実施例1の変色芯よりも、インクの
紙への転写速度は緩慢ではあつたが、約2〜3日経過し
た黒い筆跡を消ゴムで消去すれば濃いピンクの筆跡が残
り、変色芯として機能した。The discolored core of Example 2 was slower in transferring the ink onto the paper than the discolored core of Example 1, but a dark pink handwriting was obtained by erasing the black handwriting after about 2-3 days with an eraser. The rest functioned as a tarnish core.
実施例3の変色芯は実施例1とほぼ同様の速度でインク
が紙に転写し、筆記した黒い筆跡を消ゴムで消去すると
鮮明な青色の筆跡が残り変色芯として機能した。In the color-changing core of Example 3, the ink was transferred to the paper at a speed substantially similar to that in Example 1, and when the written black handwriting was erased with an eraser, a clear blue handwriting remained and functioned as a color-changing core.
比較例1の芯で筆記した筆跡は、黒い筆跡としては十分
であるものの、これを消ゴムで消去すれば、ごくかすか
に赤く筆跡が残る程度で、この色調は時間を経ても改善
されず、変色芯としては不十分であつた。またこの芯は
黒色焼結体の気孔中のインクの主成分が水であるために
蒸発してしまい、インクを充填した直後から、かなり急
速にインクが飛散し、まつたく実用的ではななかつた。The handwriting written with the core of Comparative Example 1 is sufficient as a black handwriting, but if it is erased with an eraser, a slightly red handwriting remains, and this color tone is not improved over time, and discoloration occurs. It was insufficient as a core. Further, this core was evaporated because the main component of the ink in the pores of the black sintered body was water, and the ink was scattered very rapidly immediately after the ink was filled, and it was not practical to blink. .
比較例2の芯で筆記した筆跡は、全く黒い筆跡のまま
で、消ゴムで消去すれば完全に消去できた。これは時間
を経ても同様で、筆跡は常に消ゴムで消去できる通常の
黒芯となんら変りなかつた。The handwriting written with the core of Comparative Example 2 remained completely black and could be completely erased by erasing with an eraser. This is the same over time, and the handwriting is no different from the usual black core that can always be erased with an eraser.
以上のように、黒色の筆記線を消ゴムで消去することに
より、他の色の筆記線が現われるという特徴を有する変
色芯は、この特許請求の範囲内で実現するものであり、
その構成の組合せは、本発明の効果を具現するための新
規な構成であつて、それ故に今までにない効果をもつた
特異な特徴を有する鉛芯が得られるものである。このこ
とは、通常のインクを含浸した鉛芯では得られない画期
的な効果となる。As described above, by erasing a black writing line with an eraser, a color-changing core having a characteristic that writing lines of other colors appear, which is realized within the scope of the claims,
The combination of the constitutions is a novel constitution for embodying the effect of the present invention, and therefore, a lead core having a unique characteristic having an effect which has never been obtained is obtained. This is an epoch-making effect that cannot be obtained with a lead core impregnated with ordinary ink.
以上、本発明の鉛芯はその特異な効果により、種々の応
用用途が考えられ、例えば黒の筆跡で筆記された重要な
部分を消去することにより、有色の筆記線を具現せし
め、筆記部の内容を比較検討することができるなど産業
上、多大の効果を奏するものである。As described above, the lead core of the present invention is considered to have various applications due to its unique effect.For example, by erasing an important portion written with a black handwriting, a colored writing line is realized, It has a great industrial effect such that the contents can be compared and examined.
Claims (3)
孔性黒色焼結体の気孔内に充填されている黒色を除く有
色インクとから構成され、インクは湿潤性溶剤を主成分
とし、これに可溶する染料とからなることを特徴とする
芯。1. A porous black sintered body containing carbon as a binder and a colored ink excluding black filled in the pores of the porous black sintered body, the ink containing a wettable solvent as a main component. And a solubilized dye in the wick.
であることを特徴とする特許請求の範囲第1項記載の
芯。2. The porosity of the porous black sintered body is 20 to 70%.
The core according to claim 1, wherein
が15%以上であることを特徴とする特許請求の範囲第
1項記載の芯。3. The core according to claim 1, wherein the dye density of the ink filled in the pores is 15% or more.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12283884A JPH0630991B2 (en) | 1984-06-14 | 1984-06-14 | Discolored core |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12283884A JPH0630991B2 (en) | 1984-06-14 | 1984-06-14 | Discolored core |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS60264296A JPS60264296A (en) | 1985-12-27 |
JPH0630991B2 true JPH0630991B2 (en) | 1994-04-27 |
Family
ID=14845881
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12283884A Expired - Lifetime JPH0630991B2 (en) | 1984-06-14 | 1984-06-14 | Discolored core |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0630991B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0959556A (en) * | 1995-08-29 | 1997-03-04 | Mitsubishi Pencil Co Ltd | Unerasable pencil lead |
JP6423158B2 (en) | 2014-02-27 | 2018-11-14 | 三菱鉛筆株式会社 | Colored pencil lead |
JP6257449B2 (en) * | 2014-06-02 | 2018-01-10 | 三菱鉛筆株式会社 | Firing solid drawing material |
JP7034684B2 (en) * | 2017-11-30 | 2022-03-14 | 株式会社パイロットコーポレーション | Fired colored pencil lead |
-
1984
- 1984-06-14 JP JP12283884A patent/JPH0630991B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS60264296A (en) | 1985-12-27 |
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