A writing tool that can easily erase written content

Abstract

The invention discloses a writing tool for easily erasing written contents, comprising an upper tube body, a lower tube body, and a shell with an inlet and outlet hole; an ink holding tube filled with an ink composition inside the shell; a ballpoint pen tip arranged at the front end of the ink holding tube; a push cover located at the back of the shell; and a spring for operating the ballpoint pen tip through elastic force. The ink composition filled in the ink holding tube comprises, by weight percentage: 20-30% of hysteresis microcapsule pigment; 1-3% of styrene maleic acid monomethyl polymer; 1-5% of methyl stearate; 15-20% of methyl benzoate; 5-10% of glycerol; 3-5% of polyvinyl pyrrolidone; 1-3% of triethanolamine; 1-2% of sodium dodecyl sulfate; and the rest is ionized water. A part or all of the lower tube body is formed by a front end erasing component, and the front end erasing component is located at a position where the ballpoint pen tip slips out, and is used for erasing erroneous written contents.

Description

Technical Field

[0001] The present invention relates to a writing tool for erasing words and a method for erasing writing contents using the writing tool. Specifically, the writing tool allows a user to write words or draw figures on a writing object with the writing tool and then easily erase the words or figures while holding the writing tool in hand, and a method for erasing writing contents using the writing tool. Background Art

[0002] Nowadays, a variety of writing instruments have been developed to be used for writing on paper or marking words or numbers. Among them, ballpoint pens and fountain pens are typical as writing instruments.

[0003] The full English name of ballpoint pen is ballpoint pen. In modern times, it has become people’s favorite writing tool.

[0004] The ballpoint pen has an ink holding tube that can be filled with viscous ink. The ink composition in the ink holding tube is used to write predetermined words or characters or draw predetermined pictures on paper through the dot ball at the end of the ink holding tube.

[0005] A ballpoint pen is a daily writing tool that is inexpensive, of relatively reliable quality, and has a low cost to purchase and use. It has a wide range of uses and has basically replaced fountain pens.

[0006] Unlike fountain pens, ballpoint pens do not require users to add ink separately. Ballpoint pens also have the advantage of providing a variety of ink colors to choose from, and they are inexpensive and easy to use. They are therefore widely used due to their economy and convenience.

[0007] However, a disadvantage of a ballpoint pen is that after a user writes predetermined characters, numbers or words on the surface of a writing object such as paper, the words are difficult to erase like a pencil.

[0008] Therefore, a ballpoint pen that can eliminate writing has been developed to solve the defectiveness of the ballpoint pen.

[0009] The working principle of conventional erasable ballpoint pens is to form the ink composition filled in the ink container into a thermosensitive ink whose color changes according to temperature, and to utilize the property that the ink component that exists in a specific color at room temperature disappears at other high temperature temperatures.

[0010] Such conventional erasable writing implements are, for example, using thermosensitive ink that can be seen only at -10°C and +50°C as the ink of the writing implement, and due to the frictional heat generated when erasing with a plastic eraser, the pigment molecules in the thermosensitive ink undergo a chemical reaction, thereby causing the color to disappear.

[0011] To this end, a plastic eraser is attached to the opposite end of the writing tool, and in order to erase the notes, the plastic eraser attached to the opposite side of the ballpoint pen core is rotated to contact the notes, and then the plastic eraser is rubbed on the characters or words, causing friction between them. The frictional heat generated by the friction changes the color of the ink composition, thereby achieving an optical illusion that the characters or words have disappeared.

[0012] As described above, the existing thermochromic ink writing tool is a writing object that must be erased using an eraser on the opposite side of the ballpoint pen core of the writing tool. The eraser is mainly composed of an elastomer containing a rubber component, and since it is combined with the opposite end of the writing tool, in order to erase the notes, the writing tool must be held again and the eraser must be brought into contact with the writing object.

[0013] At this time, the eraser rubs against the handwritten content written on the writing object, and the frictional heat generated at this time is transferred to the ink components contained in the handwritten content, and the frictional heat causes the ink components to change color.

[0014] However, in the existing thermochromic ink writing tools, when the eraser is rubbed on the writing surface, the friction heat is not stored in the eraser but released. The friction heat generated by the friction of the eraser is not concentrated on the writing, and the friction heat of the eraser is not continuously stored after the friction. Therefore, when erasing other writing materials, the friction heat generated by the friction needs to continue to occur.

[0015] Therefore, there are problems such as the writing surface being damaged or the gloss being lost due to continuous friction (for example, see registered patent 10-1377293).

[0016] Because existing thermochromic ink writing implement must produce friction heat, therefore as its friction heat generation tool, must make independent elastomer eraser be attached to or be incorporated on the main body of writing implement.Particularly, independent elastomer eraser is attached to the end of the ballpoint pen tip opposite side of writing implement or is combined together.

[0017] In addition, when the user wants to erase words or characters, the existing thermochromic ink writing tool must stop writing, hold the thermochromic ink writing tool in the opposite direction, and use the elastic eraser to erase the words or characters recorded on the writing object surface. Therefore, the elastic eraser of the existing thermochromic ink writing tool is often lost.

[0018] The elastic eraser attached to the existing thermochromic ink writing tool produces eraser residues to pollute the surrounding area when rubbed on the paper surface, and its volume will also shrink due to wear and tear during continued use.

[0019] The eraser of the existing thermochromic ink writing instrument is mainly composed of a synthetic rubber that is conducive to eliminating with friction heat. If the intensity of the eraser is improved, it is difficult to erase. On the other hand, if the intensity of the eraser is reduced, it is easy to erase, but the adhesion state is not firm in the process of using the eraser, and it is easy to break (see Figure 5 ), lost, or the assembly part falls off (for example: see registered patent No. 10-0642350 for details).

[0020] When an existing thermochromic ink writing tool is used to correct an erroneous content during a writing operation, the writing action must be paused first, and the holding position of the ink writing tool must be changed before erasing the word.

[0021] Writing assignments require a high degree of concentration. You need to instantly capture the thought that flashes in your mind and put that momentary feeling or expression into the writing assignment. Therefore, writing assignments should not be paused, but should continue.

[0022] In summary, existing erasing writing instruments do not use friction materials that can be attached or combined to the main body of the writing instrument, but it is necessary to develop an erasing writing instrument that can directly utilize the main body of the writing instrument, but such technology has not yet been developed.

[0023] The following embodiments can be used as relatively typical technologies in the existing technology.

[0024] [Prior technical literature]

[0025] [Patent Literature]

[0026] Korean registered patent No. 10-2179179 "Eraser composition for thermochromic ink writing instruments";

[0027] Korean registered patent No. 10-2169972 "Knob-type thermochromic ink writing tool with heat storage friction agent";

[0028] Korean registered patent No. 10-2191748 "Thermochromic ink writing instrument with heat storage friction agent";

[0029] Korean registered patent No. 10-1876526 "Ink composition for writing instruments without cap sealing";

[0030] Korean Utility Model Registration No. 20-489134 "Thermochromic ink writing instrument with heat storage friction agent" Summary of the invention

[0031] Technical issues

[0032] The object of the present invention is to provide a writing tool. When the user of the writing tool wants to erase the content recorded on the writing object, there is no need to change the direction of holding the ballpoint pen of the writing tool, but it can be erased directly in the writing direction, so as to solve the problems existing in the prior art.

[0033] Another object of the present invention is to provide a writing tool that can be easily removed without using an elastic eraser attached to the main body of the writing tool.

[0034] Another object of the present invention is to provide, in the process of eliminating written content, can not produce erasing rubber slag, thereby prevent to pollute around, can not reduce because of wearing and tearing volume during repeated use, perhaps need not change the writing implement of new erasing rubber.

[0035] Technical Solution

[0036] To achieve the above object, the writing implement of the present invention preferably comprises: a housing, which comprises an upper tube body and a lower tube body in the shape of a hollow tube body and an inlet and outlet hole; an ink holding tube, which contains ink composed of an ink composition inside the housing; a ballpoint pen tip, which is arranged at the front end of the ink holding tube; a push cap, which is located at the back of the housing and operates the ink holding tube to reciprocate in the upward and downward directions; a spring, which makes the ballpoint pen tip operate by elastic force inside the housing;

[0037] The composition of the ink composition filled in the ink holding tube includes: 20 to 30 weight percent of hysteresis microcapsule pigment formed by microcapsules; 1 to 3 weight percent of styrene maleic acid monomethyl polymer as a flow improver; 1 to 5 weight percent of methyl stearate as an adhesion regulator; 15 to 20 weight percent of methyl benzoate as an adhesion regulator and antibacterial agent; 5 to 10 weight percent of glycerol as an adhesion regulator and moisturizer; 3 to 5 weight percent of polyvinyl pyrrolidone as a viscosity regulator; 1 to 3 weight percent of triethanolamine as a neutralizer; 1 to 2 weight percent of sodium dodecyl sulfate as a surfactant; and the rest is ionized water.

[0038] The lower tube body is a part thereof or a front part thereof is formed by a front end elimination component;

[0039] The front end eliminating component is located at the position where the ballpoint pen tip emerges and disappears, and its purpose is to eliminate the erroneous writing content recorded by the user.

[0040] The material of the front end elimination component is mainly composed of polypropylene, which includes: 5 to 10 weight percent of hydrogenated styrene-isoprene-butadiene block copolymer; 5 to 10 weight percent of hydrogenated heavy alkane (Hydrotreated HeavyParaffinic); 0.2 to 0.5 weight percent of 1,2,3-benzotriazole, and the rest is composed of the polypropylene resin.

[0041] Preferably, the front end eliminating component is a part or the whole of the lower tube body of the shell, and the corner portion R between the end surface and the side surface of the front end is formed in an arc shape, and the size of the arc shape is between 0.5 and 1.5 mm.

[0042] The front end eliminating member has a surface roughness in the range of 1.5 Ra to 3.0 Ra.

[0043] Here, preferably, when the front end eliminating member is to be given a color corresponding to or different from the shell of the writing instrument, 0.002 weight percent to 0.02 weight percent of a coloring pigment is added to the total weight.

[0044] The present invention provides a method for erasing writing contents recorded on the surface of a writing object using the writing tool.

[0045] The method for erasing written content of the present invention preferably includes: a first step S210 in which the user writes, draws or expresses the written content W on the surface of the writing object P according to his or her intention with a writing tool; a second step S220 in which the user inserts the ballpoint pen tip of the writing tool into the inner side of the tube body of the writing tool and hides it; a third step S230 in which the user places the front end erasing component on the surface of the writing object P while holding the writing tool, thereby contacting the written content to be erased; and a fourth step S240 in which the front end erasing component is gently pressed on the surface of the writing object P and moved back and forth in the left and right directions at the same time, thereby erasing the written content.

[0046] Beneficial Effects

[0047] According to the present invention, a part of the writing tool body can be used to erase wrongly written words, characters, numbers, etc., so no additional eraser is needed.

[0048] According to the present invention, after writing on paper with a writing tool, if the writing tool is to be erased, it is not necessary to reposition the writing tool, but the front end eraser is used to erase the writing tool in the original writing state. Therefore, the present invention has the advantages that the erasing operation is not only very convenient, but also can be performed quickly.

[0049] According to the present invention, a separate eraser is not required, but a part of the writing tool body is utilized, so the advantage is that there is no need to worry about the eraser being lost.

[0050] According to the present invention, no eraser residue will occur during the process of erasing written content, thereby preventing the surrounding from being polluted.

[0051] According to the present invention, it has the beneficial effect that repeatedly uses and eliminates parts, but volume reduction can not occur because of wear and tear, or does not need to replace erasing rubber into new one fully. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a cutaway cross-sectional view showing a portion of the structure of a common ballpoint pen;

[0053] Figure 2 This is a modeled conceptual diagram of a state in which a writing tool of the present invention is used to write on the surface of a writing object;

[0054] Figure 3 This is a modeled conceptual diagram of a state in which written content, i.e., words, etc. recorded on the surface of a writing object using the writing tool of the present invention are erased;

[0055] Figure 4 is an enlarged cross-sectional view showing an enlarged illustration of the lower main structure including the front end elimination component;

[0056] Figure 5 The conceptual diagram shows, by way of example, a state in which an elastic eraser coupled to the upper portion of a conventional writing tool is broken and detached during use.

[0057] Explanation of symbols:

[0058] 100: writing tools;

[0059] 110: housing;

[0060] 120: rubber pad;

[0061] 130: ink containing tube;

[0062] 140: ballpoint pen tip;

[0063] 150: Press the cover;

[0064] 160: Spring;

[0065] 200: front end elimination component;

[0066] P: writing object;

[0067] W: Written content. DETAILED DESCRIPTION

[0068] The technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings in the embodiments of the present invention, but the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The specific values ​​or specific embodiments provided in the present invention are only preferred embodiments of the present invention and are only used to further describe the technical solutions of the present invention in detail.

[0069] According to the present invention, the front or front end refers to the part of the writing tool where the ballpoint pen tip is located, which is the direction in which the ballpoint pen tip extends outward from the writing tool or enters into the writing tool, and the rear refers to the opposite direction of the front, which is the direction in which the push cap of the writing tool is located. The weight percentage refers to the relative weight of the component in the entire composition, unless otherwise specified.

[0070] According to the description of the present invention, parts that are well known in the technical field and can be easily created by ordinary technicians will not be described in detail.

[0071] The present invention provides a writing tool that can erase the wrong words W and other contents written on the surface of a writing object P. A ballpoint pen is a more representative of the writing tools 100. The drawing of the present invention illustrates the writing tool with a ballpoint pen. The writing tool object P is representative of paper, and the words W and other contents refer to characters, numbers, symbols, pictures, etc. written or recorded on the surface of the writing object P.

[0072] Figure 1 This is a partially cutaway cross-sectional view showing the structure of a common ballpoint pen.

[0073] The invention further improves the common ballpoint pen so that the common ballpoint pen can be used continuously.

[0074] The writing tool 100 according to the present invention includes a housing 110 which is divided into an upper body 111 and a lower body 112 in a hollow tube shape and assembled by screws. The upper body 111 and the lower body 112 can be formed into an integral type. The front end of the lower body 112 forms an inlet and outlet hole 113. The interior of the housing 110 includes an ink holding tube 130, and the ink holding tube 130 contains an ink composition that can distinguish the content of writing. The front end of the ink holding tube 130 is combined with a ballpoint pen tip 140 that allows the ink composition to be finely transported. The ballpoint pen tip 140 enters the interior of the writing tool through the inlet and outlet hole 113 or extends to the outside of the writing tool. The upper part of the housing 110 is provided with a push cover 150 that is operated to move the ballpoint pen tip 140 up and down together with the ink holding tube 130, and a spring 160 is provided at the end of the ballpoint pen tip 140 and the inner side of the housing 110.

[0075] When the user operates the push cover 150 to make the ink containing tube 130 including the ballpoint pen tip 140 appear or disappear, the sawtooth protrusion disposed at the bottom of the push cover 150 contacts the rotating cam (not shown) and the ballpoint pen tip 140 is raised or lowered. When the push cover 150 protruding toward the outer side of the upper end of the housing 10 in the push-to-appear structure of the ballpoint pen tip is pressed, the rotating cam and the ink containing tube 130 are simultaneously lowered, and the spring 160 is compressed and the ballpoint pen tip 140 is exposed to the outside through the inlet and outlet hole 113 of the lower tube body 112. Then, the push cover 150 is pressed again, and the ballpoint pen tip 140 exposed outside the lower tube body 112 moves to the upper inner side of the housing 110 together with the ink containing tube 130 due to the elastic force of the spring 160.

[0076] Figure 2 This is a conceptual diagram of a state where a character W is written on the surface of a writing object P using the writing tool 100 of the present invention.

[0077] Figure 3 This is a conceptual diagram of a state in which a word W or the like written on the surface of a writing object P is erased using the writing tool 100 of the present invention.

[0078] Figure 4 It is a cross-sectional view showing an enlarged structure of the lower tube body 112 including the front end erasing member 200.

[0079] The erasing component 200 of the writing tool for erasing words according to the present invention does not use an elastomeric eraser as is conventionally the case, but preferably uses a writing tool tube body, so that the writing content written on the surface of the writing object is erased through the writing tool tube body without having to hold the writing tool back and forth again.

[0080] Compared with the existing method of erasing writing content using a writing tool, the writing content erasing component structure and the writing content erasing method according to the present invention do not use an independent elastic eraser, but set the writing content erasing device as a part of the writing tool tube body, so there is a huge gap in this point. The existing method of erasing using thermodeformable ink is that after the user writes on the surface of the writing object, the written content is erased using an eraser that is independently attached to the writing tool tube body or a separate combination.

[0081] In contrast, the method for erasing written content according to the present invention is to erase the written content by using the front end erasing member 200 that is coupled to the writing tool tube body or formed by the lower tube body that constitutes a part of the housing 110 .

[0082] Usually, the words written on paper are not easy to erase. In order to erase the wrong words, white erasing liquid or white tape is used, or when erasable ink is used, a separate friction eraser is used to induce ink discoloration.

[0083] In contrast, the technical feature of the present invention is that after writing a word W or other content on the writing object, i.e., paper, the direction of the writing tool 100 does not need to be changed. Instead, the word or other content written on the paper can be directly and instantly erased while holding the writing tool 100.

[0084] This technical feature is achieved by improving the structure of the ink composition filled in the ink containing tube 130 and the lower tube body 112 of the housing 110 as described below.

[0085] The ink composition of the writing tool 100 according to the present invention includes: 20 to 30 weight percent of hysteresis microcapsule pigment formed by microcapsules; 1 to 3 weight percent of styrene maleic acid monomethyl polymer as a flow improver; 1 to 5 weight percent of methyl stearate as an adhesion regulator; 15 to 20 weight percent of methyl benzoate as an adhesion regulator and antibacterial agent; 5 to 10 weight percent of glycerol as an adhesion regulator and moisturizer; 3 to 5 weight percent of polyvinyl pyrrolidone as a viscosity regulator; 1 to 3 weight percent of triethanolamine as a neutralizer; 1 to 2 weight percent of sodium lauryl sulfate as a surfactant; and the rest is ionized water.

[0086] In the present invention, the ink composition filled in the ink containing tube 130 contains 20 to 30 weight percent of hysteresis microcapsule pigment formed by microcapsules. The hysteresis pigment is used to display the color of the letter W, and is formed of tiny fine capsule powder, and the use range is 20 weight percent to 30 weight percent in the total weight.

[0087] The hysteresis pigment is the color of the ballpoint pen used to display black, red, pink, green, blue, etc. The words W include various characters, numbers, symbols, and figures written or drawn on the writing object P, that is, paper.

[0088] The ink composition filled in the ink receiving tube 130 contains 1 to 3 weight percent of styrene maleic acid monomethyl polymer. The styrene maleic acid monomethyl polymer can provide fluidity to the ink composition or be used to improve the fluidity.

[0089] The fluidity of this ink allows the user to use the ballpoint pen naturally without feeling any inconvenience when writing or drawing on the writing object P, i.e., paper, thereby completing its function.

[0090] The ink composition filled in the ink holding tube 130 contains 1-5 weight percent of methyl stearate and 15-20 weight percent of methyl benzoate. The methyl benzoate component imparts adhesiveness and antibacterial properties to the ink composition and serves as a composite function of an adhesive regulator. The adhesive property can enhance the mixing and bonding properties with other substances and even other components constituting the ink composition, so that the ballpoint pen can continuously and smoothly write the word W.

[0091] The methyl benzoate imparts antibacterial properties to the ink composition, so that when the ink composition is not used for a long time and is placed for a long time, it can continue to maintain a stable state and will not be infected by external spoilage bacteria.

[0092] When the methyl benzoate ink composition is fixed and stored on the writing object P, i.e., paper, in the form of a character W, it can activate an auxiliary function to adjust the bonding force between the ink and the writing object P, i.e., paper. At this time, the methyl benzoate ink composition can act in a direction in which the bonding force between the ink and the writing object P, i.e., paper, can be weakened compared to the existing ordinary ink.

[0093] Usually, when the existing ink composition for ballpoint pens is present in the form of the letter W on the writing object P, i.e., paper, a part of the existing ink composition for ballpoint pens penetrates into the interior of the paper, so when a force is applied from the outside, the ink composition for ballpoint pens tends to be completely eliminated on the surface of the paper. In other words, the ordinary ink composition for ballpoint pens directly maintains or eliminates the form of the letter W, forming a state in which a part is retained, and is not completely eliminated. Therefore, the existing ink that is eliminated is that the component changes color through friction heat, thereby providing the user with the effect that the color appears to be eliminated to the naked eye. In contrast, the ink for the ballpoint pen for elimination of the present invention weakens the bonding force with the paper or adjusts the bonding force to prevent it from completely settling into the inner surface of the writing object P, i.e., paper, and is formed to be further weaker than the bonding force of the existing ordinary ink composition.

[0094] The ink composition of the writing instrument 100 of the present invention contains 5 to 10 weight percent of glycerol.

[0095] The glycerol functions as a moisturizer and lubricant. The molecular structure contains a large number of hydroxyl groups, which imparts moisturizing properties to the ink components. In addition, the lubricity can be increased. The lubricity can effectively prevent the wear of the ball receiving portion at the lower end of the ballpoint pen ink receiving tube 130, and when the ink is retained on the surface of the writing object P, i.e., paper, in the form of a letter W, it can prevent the ink from penetrating into the inside of the paper.

[0096] Lubricity is to help the word W to fall off the surface of the paper easily when a predetermined external force is applied to the word W. Because the glycerol component can provide lubricity, it can provide moisture retention between the multiple components inside the ink. On the contrary, it acts as a lubricant between the ink composition and the paper, which can help weaken the bonding force between these components.

[0097] The ink composition of the writing instrument 100 of the present invention contains 3-5 weight percent of polyvinyl pyrrolidone. The polyvinyl pyrrolidone is a viscosity modifier of the ink and has the function of agglomerating the water-soluble polymer component, which can be further interpreted as adjusting the overall viscosity of the ink composition.

[0098] The ink composition of the writing instrument 100 of the present invention contains 1 to 3 weight percent of triethanolamine. The triethanolamine has the functions of a stabilizer and a neutralizer, and is used to improve the aggregation and dispersibility of the ink.

[0099] The ink composition of the writing instrument 100 of the present invention contains 1 to 5 weight percent of sodium dodecyl sulfate, which is used as a surfactant.

[0100] The ink composition of the writing instrument 100 of the present invention contains ionized water as the remaining component. The ionized water functions as a solvent for the above-mentioned components.

[0101] The ink composition is manufactured in a common manner and filled into the ink containing tube 130. The ink composition plays a great role in enabling the user of the writing instrument 100 of the present invention to easily and simply erase the contents written on the writing object P.

[0102] The writing instrument 100 of the present invention includes a tip erasing member 200 that can simply and easily erase the contents written on the writing object P.

[0103] The writing tool 100 has a cylindrical housing 110 on the outside, a lower tube body 112 which is gradually narrowed and inclined toward the center, and an upper tube body 111 which is assembled on the lower body 112 by screwing. A rubber pad 120 is preferably installed around the lower tube body 112 to prevent slipping and improve the touch when the user holds it with his hands for writing. A push cover 150 which is operated by a push button is provided at the rear of the writing tool 100.

[0104] The housing 110 includes an ink container 130 containing ink to be written, and a metal ballpoint pen tip 140 is disposed at the front of the ink container 130. A spring 160 is inserted outside the ballpoint pen tip 140, and the spring 160 allows the ballpoint pen tip 140 to be exposed to the outside through the access hole 113 of the lower tube body 112 or to enter the inner side thereof when the push cover 150 is pressed.

[0105] The writing tool 100 of the present invention includes a front end eliminating member 200 for simply and conveniently eliminating the contents written on the writing object P. The front end eliminating member 200 preferably forms a part or the whole of the lower tube 112 .

[0106] The front end erasing member 200 is provided on the lower tube body 112 where the access hole 113 is formed in order to erase the letter W written on the surface of the writing object P. The ballpoint pen tip 140 is inserted and removed in the vertical direction through the access hole 113. The technical feature of the front end erasing member 200 is that it is provided at the position where the access hole 113 is located and is directly formed at the position where the ballpoint pen tip 140 is inserted and removed in the vertical direction.

[0107] The front end elimination component 200 is a part of the tube body of the writing tool 100, and more preferably, it covers the front of the writing tool 100. More specifically, it is set in a form that forms the entrance and exit hole 113 of the lower tube body 112 and covers the outer peripheral edge of the ballpoint pen tip 140 at the same time.

[0108] The front end eliminating member 200 is preferably formed as a part or all of the lower tube 112 and is provided in an arc ring shape at the corner portion R between the end surface and the side surface. The arc shape of the corner portion R is to eliminate the written word W, and the writing tool 100 is as Figure 2 and Figure 3 As shown, the lower tube 112 is tilted at a certain angle, and when the word W written on the paper is pressed in the tilted state, the part actually contacts the paper. Therefore, the lower tube 112 is formed with an arc of appropriate size at the corner R between the end face and the side face, so as to prevent the paper from being seriously damaged during the removal process.

[0109] The size of the corner arc R is preferably between 0.5 and 1.5 mm, preferably 0.75 mm, which has a good elimination effect and does not damage the appearance of the writing tool. When the size of the corner plate R is less than 0.5 mm, the probability of damaging the paper increases. When it exceeds 1.5 mm, the paper can be protected, but there is a defect that the design of the lower tube 112 will lose balance.

[0110] As described above, according to the present invention, the front end eliminating member 200 forms a part or the whole of the lower tube 112 of the writing tool 100 and is located near the lower tube 112 of the writing tool where the ballpoint pen tip 140 emerges and disappears.

[0111] When the front end eliminating component 200 is arranged near the position where the ballpoint pen tip 140 of the lower tube body 112 appears and disappears, when a person using the writing instrument 100 of the present invention wants to erase the written part, there is no need to hold the writing instrument 100 of the present invention upside down as in the prior art, but the person can directly perform the erasing action while holding the writing instrument 100 in the original state.

[0112] According to the present invention, the front end elimination component 200 is formed of a synthetic resin material with polypropylene resin as the main raw material because, first, it forms a part or all of the tube body of the writing tool 100, so the tube body strength of the writing tool needs to be maintained; second, it needs to have the strength to extrude the elimination object, i.e., the written content, from the surface of the writing object; and third, it needs to provide a predetermined surface roughness to the written content that is the elimination object on the surface of the writing object while maintaining its surface roughness.

[0113] The main purpose of the front-end elimination component 200 is to eliminate the written content incorrectly written by the user. Its material uses polypropylene resin as the main raw material, and the total weight includes: 5 to 10 weight percent of hydrogenated styrene-isoprene-butadiene block copolymer; 5 to 10 weight percent of hydrogenated heavy alkane (Hydrotreated Heavy Paraffinic); 0.2 to 0.5 weight percent of antioxidant 1,2,3-benzotriazole, and the rest includes the polypropylene resin.

[0114] The front end elimination component 200 is made of polypropylene resin as the main raw material. As mentioned above, the front end elimination component 200 is, firstly, required to maintain the strength of the writing tool tube body because it forms part or all of the lower tube body of the writing tool 100; secondly, required to have the strength to squeeze the elimination object, i.e., the writing content, out of the surface of the writing object; and thirdly, required to have the surface roughness to contact the elimination object, i.e., the writing content. The polypropylene resin is used to provide these functions.

[0115] The front end erasing component 200 does not wear out or run out like the existing elastic eraser when performing most erasing actions, but always maintains its original shape, and maintains a predetermined surface roughness in the range of 1.5 to 3 Ra when measured by a roughness meter. When the front end erasing component 200 maintains the surface roughness as described above, it is more suitable for effectively erasing written content.

[0116] The front end elimination member 200 includes 5 to 10 weight percent of the hydrogenated styrene-isoprene-butadiene block copolymer in the total weight. The hydrogenated styrene-isoprene-butadiene block copolymer provides the front end elimination member 200 with a predetermined flexibility.

[0117] The hydrogenated styrene-isoprene-butadiene block copolymer is a synthetic product obtained by copolymerizing a styrene component and a butadiene component. The polymer has a double bonding structure inside, which gives the hard and strong polypropylene main component a relatively flexible property, thereby compensating for the defect of being easily broken or fractured due to external impact.

[0118] When the hydrogenated styrene-isoprene-butadiene block copolymer contains less than 5 weight percent, its flexibility is weak. On the contrary, when the hydrogenated styrene-isoprene-butadiene block copolymer contains more than 10 weight percent, the strength of the front end elimination component 200 may be weakened, so it is not suitable.

[0119] The front end elimination member 200 contains 5 to 10 weight percent of hydrogenated heavy alkane in its total weight. The hydrogenated heavy alkane has the function of providing a predetermined contact surface roughness to the front end elimination member 200.

[0120] Since the front end erasable member 200 contains the hydrogenated heavy alkane component, it is closely attached to the written content to be erased, and when it is moved in the left-right direction under pressure, it does not slide but squeezes the written content from the surface of the written object.

[0121] When the hydrogenated heavy alkane content is below 5 weight percent, the surface roughness of the front end elimination component 200 drops to below 1.5Ra, and it is unable to flexibly perform the function of eliminating written content. On the contrary, when the hydrogenated heavy alkane content is above 10 weight percent, the surface roughness of the front end elimination component 200 increases to above 3.0Ra, so it is not very suitable.

[0122] When the hydrogenated heavy alkane content is in the range of 5 to 10 weight percent, when the user rubs the front end eliminating member 200 on the writing object, a so-called "snapping and sticking" feeling is provided.

[0123] This method is completely opposite to the existing technology which uses thermal deformation caused by friction heat.

[0124] The total weight of the front end elimination component 200 includes 0.2 to 0.5 weight percent of the antioxidant 1,2,3-benzotriazole. The 1,2,3-benzotriazole functions as an antioxidant. When the antioxidant is used in an amount below 0.2 weight percent, the antioxidant function cannot be properly exerted. On the contrary, when the antioxidant is used in an amount exceeding 0.5 weight percent, the antioxidant function cannot be increased in proportion to the amount of the input, so the content should not be greater than this.

[0125] When the ballpoint pen tip 140 enters and exits the writing tool through the inlet and outlet 113, the ballpoint pen tip 140 contacts the front end eliminating member 200 covering the outer peripheral edge portion thereof, and the front end eliminating member 200 may cause an oxidation reaction through the metal component of the ballpoint pen tip 140. Therefore, in order to prevent such oxidation reactions, the 1,2,3-benzotriazole is used as an antioxidant.

[0126] The front end elimination component 200 is preferably composed of the polypropylene in the rest of the total weight. The polypropylene is used to maintain the strength of the front end elimination component 200. Generally, it accounts for 80 to 90 weight percent of the total weight, but according to the content of each component listed above, the lower limit range and the upper limit range may vary slightly.

[0127] If the front end eliminating member 200 is to be given a color corresponding to or different from the writing instrument tube body, 0.002 to 0.02 weight percent of a pigment can be added to the total weight. The pigment can be used to give color and is commonly used in the technical field.

[0128] In addition, the present invention provides a method for erasing written content using the writing tool 100 .

[0129] The method for erasing written contents according to the present invention is as follows.

[0130] The method for erasing written content of the present invention includes a first step S210 in which a user writes written content, draws, or expresses the content on the surface of a writing object P using a writing tool 100 according to his or her own intention.

[0131] The first step S210 is a step in which the user holds the writing tool and writes the content on the surface of the writing object in the form of words, or draws it in the form of pictures, or expresses it in other forms. The step S210 of recording the written content can be performed in the same way as in the existing common method.

[0132] The method for erasing written content of the present invention comprises a second step S220 in which the user causes the ballpoint pen tip of the writing tool to enter the inner side of the tube body of the writing tool and hide the ballpoint pen tip. The second step S220 can be said to be a step for hiding the ballpoint pen tip.

[0133] The second step S220 is a necessary step that the user must perform when he wants to erase the written content. The user uses the elastic force of the spring 160 disposed inside the writing tool to make the ballpoint pen tip 140 enter the back of the writing tool, so that the ballpoint pen tip 140 does not protrude to the front end of the writing tool, and no other words or pictures are recorded on the surface of the writing object.

[0134] When the third step S230 is performed instead of the second step S220, the surface of the writing object may be recorded with unexpected writing content by the ballpoint pen tip 140, and the third step S230 cannot be performed smoothly.

[0135] From this point of view, the second step S220 of the present invention is not necessarily performed in the present invention, but may or may not be performed in the existing technology or existing writing tools.

[0136] The method for erasing written content according to the present invention includes a third step S230 in which a front end erasable body is placed on a surface of a writing object and contacts the written content to be erased while the user holds the writing tool. The third step S230 can be said to be a contact step of the front end erasable body.

[0137] The third step S230 indicates that the user does not need to hold the writing tool 100 in a reverse position, but directly removes the writing tool in the original holding state. The existing writing tool is that the user must hold the writing tool in a reverse position, which is completely different.

[0138] The existing writing tool has an elastomeric eraser attached to the back of the writing tool. Therefore, the existing writing tool is held in a front-to-back position so that the elastomeric eraser originally at the back is shifted to the front. However, the present invention can directly use the front end eliminating component 200 arranged at the frontmost front of the writing tool 100 tube body.

[0139] The third step S230 is to place the writing tool 100 on the surface of the writing object while holding it, so that the front end erasing component 200 contacts the writing content to be erased. At this time, the front end erasing component 200 constitutes a part or all of the lower tube 112 of the writing tool 100, and is preferably located at the front of the lower tube 112 of the writing tool. When the front end erasing component 200 is located at the front of the lower tube 112, if the user wants to perform an erasing operation, the operation can be performed in the state of direct holding, without changing the position of the writing tool front and back.

[0140] The method for erasing written content according to the present invention includes a fourth step S240 of erasing the written content by gently pressing the front end erasing member 200 on the surface of the writing object and reciprocating in the left and right directions. The fourth step S240 can be regarded as an erasing step.

[0141] The fourth step S240 is that the user holds the writing tool 100 with his hand, and gently presses the front end erasing component 200 with the writing content to be erased as the object. This is to make the front end erasing component 200 and the writing content as the erasing object contact each other to cause friction. At this time, the front end erasing component 200 is, as in the prior art, not using an elastomer eraser. The front end erasing component 200 uses a surface roughness in the range of 1.5 to 3Ra.

[0142] The fourth step S240 is that the user gently presses the front end erasing component 200 while reciprocating in the left and right directions, thereby squeezing out the written content on the surface of the writing object and erasing it. The existing method of removing the written content is to cause friction temperature by rubbing an elastic eraser, and the friction temperature causes the written content on the surface of the writing object to change color, and the color change effect achieves the effect of the written content disappearing.

[0143] In contrast, the present invention makes the front end erasing component 200 come into close contact with the writing recorded on the surface of the writing object, applies a force of close contact, causes the writing to fall off the surface, and thus erases the writing.

[0144] The fourth step S240 is that although the behavior observed from the outside looks the same, the technical function and even the application method of the technology are completely different from the invention applied for a patent and the previous prior art.

[0145] According to the features of the present invention, after writing on paper using a writing tool, when erasing the word, there is no need to change the position of the writing tool back and forth and hold it again.

[0146] The front end erasing component is used to perform the erasing operation in the original writing state, so not only is the erasing operation extremely convenient, but the erasing operation can also be performed quickly.

[0147] The present invention does not need an independent rubber eraser, but only utilizes a part of the writing tool tube body, so there is no need to worry about the problem of losing the eraser.

[0148] The above describes in detail the writing tool for eliminating characters and the method of using the same of the present invention, but only describes the embodiments of the present invention in detail and specifically, and does not mean that all features of the present invention are limited to the above-mentioned project contents.

[0149] A person skilled in the art may still modify or imitate the technical solutions described in the aforementioned embodiments, and these modifications or imitations do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions described in the embodiments of the present invention.

Claims

1. A writing tool that can easily erase written content, characterized in that: As a writing tool, the invention comprises: a housing, which comprises an upper tube body and a lower tube body forming a tube shape and an inlet and outlet hole; an ink holding tube, which is filled with an ink composition inside the housing; a ballpoint pen tip, which is arranged at the front end of the ink holding tube; a push cap, which is located at the back of the housing; and a spring, which makes the ballpoint pen tip operate by elastic force; The lower part of the push cover is provided with a sawtooth protrusion and a rotating cam. When the push cover is operated, the sawtooth protrusion contacts the rotating cam and causes the tip of the ballpoint pen to move up and down. The ink composition filled in the ink holding tube comprises: 20-30 weight percent of delayed microcapsule pigment formed by microcapsules; 1-3 weight percent of styrene maleic acid monomethyl polymer; 1-5 weight percent of methyl stearate; 15-20 weight percent of methyl benzoate; 5-10 weight percent of glycerol; 3-5 weight percent of polyvinyl pyrrolidone; 1-3 weight percent of triethanolamine; 1-2 weight percent of sodium dodecyl sulfate; the rest is ionized water; The styrene maleic acid monomethyl polymer provides fluidity to the ink composition or is used to improve the fluidity; The methyl benzoate component imparts adhesiveness and antibacterial properties to the ink composition and serves as a composite function of an adhesion regulator; The glycerol functions as a moisturizer and lubricant. The hydroxyl groups in the molecular structure impart moisturizing properties to the ink components and also increase lubricity. The polyvinyl pyrrolidone is used as a viscosity modifier of the ink and has the function of agglomerating the water-soluble polymer component; The triethanolamine has the functions of a stabilizer and a neutralizer, and is used to improve the coagulation and dispersibility of the ink; The sodium lauryl sulfate is used as a surfactant; The ionized water has the function of serving as a solvent; A part or the whole of the lower tube of the shell forms a front end elimination component; The front end eliminating component is located at the position where the ballpoint pen tip emerges, and is used to eliminate the erroneous written content recorded by the user; The material of the front end elimination component is mainly composed of polypropylene resin, and its composition includes: in the total weight, it contains: 5-10 weight percent of hydrogenated styrene-isoprene-butadiene block copolymer; 5-10 weight percent of hydrogenated heavy alkane; 0.2-0.5 weight percent of 1,2,3-benzotriazole, and the rest is composed of the polypropylene resin; The hydrogenated styrene-isoprene-butadiene block copolymer provides a predetermined flexibility to the front end elimination component; The hydrogenated heavy alkane has the function of providing a predetermined contact surface roughness to the front end elimination component; The 1,2,3-benzotriazole functions as an antioxidant; The polypropylene resin is used to maintain the strength of the front end elimination member.

2. The writing tool for easily erasing written content according to claim 1, characterized in that: The corner portion R between the end surface and the side surface of the front end of the lower tube body is formed in an arc shape; The size of the arc shape of the corner portion R is formed between 0.5 and 1.5 mm.

3. The writing tool for easily erasing written contents according to claim 2, characterized in that: The front end eliminating member has a surface roughness in the range of 1.5 Ra to 3.0 Ra.

4. The writing tool for easily erasing written contents according to claim 2, characterized in that: When the front end eliminating member is to be given a color corresponding to or different from the shell of the writing instrument, 0.002 weight percent to 0.02 weight percent of a coloring pigment is added to the total weight.

5. A method for erasing written content using a writing tool, wherein the writing tool is an easily erasable writing tool as claimed in any one of claims 1 to 4, characterized in that: The first step is that the user expresses the writing content W on the surface of the writing object P according to his / her own intention with a writing tool; A second step in which the user inserts the ballpoint pen tip of the writing tool into the inner side of the tube body of the writing tool and hides it; A third step in which the user holds the writing tool and places the front end erasing member on the surface of the writing object P so as to contact the writing content to be erased; The fourth step is to gently press the front end erasing member on the surface of the writing object P while reciprocating in the left and right directions to erase the writing content.

Images