Pen point and writing pen

Abstract

The utility model provides a pen point and a writing pen, and relates to the technical field of writing. The pen point comprises a body, a mounting seat and a writing bead, and an ink supply runner is arranged in the body and used for conveying self-decoloration ink; the mounting base is arranged in the body, a containing cavity is formed between the end, in the axial direction, of the body and the mounting base, and the containing cavity communicates with the ink supply flow channel; the writing bead is at least partially arranged in the containing cavity, and the writing bead is configured to abut against the mounting base and can move in the axial direction of the body, so that the writing bead selectively abuts against the inner wall of the body. When the writing bead is pressed for writing, the writing bead abuts against and pushes the mounting seat, so that the mounting seat deforms relative to the body, the writing bead does not abut against the inner wall of the body, and a gap is formed between the writing bead and the inner wall of the body, so that the self-decoloration ink can be discharged conveniently.

Description

Technical Field

[0001] The utility model generally relates to the field of writing technology, and in particular to a pen head and a writing pen. Background Art

[0002] The existing middle and lower grade primary school students have the need to practice calligraphy, which is characterized by simplicity, repetition and large quantity. Commonly used calligraphy pens include pencils, fountain pens, ballpoint pens, etc., and the writing paper used for calligraphy practice includes ordinary paper, books, calligraphy practice copybooks and red tracing copybooks, etc. Due to the characteristics of the calligraphy practice process, if a fountain pen or ordinary ballpoint pen is used, the traces after writing cannot be eliminated, which will cause a large amount of paper and various copybooks for calligraphy practice. If a pencil or a heat-erasable ballpoint pen is used, the process of eliminating the traces needs to be added after writing, resulting in a waste of calligraphy practice time, and the residual traces affect the reuse effect of the paper. Utility Model Content

[0003] The pen head and writing pen provided by the utility model can automatically fade color and improve the utilization rate of paper.

[0004] According to a first aspect of the utility model, there is provided a pen tip, comprising:

[0005] A body, wherein an ink supply channel is provided in the body, and the ink supply channel is used to transport self-erasable ink;

[0006] A mounting seat is disposed in the body, and a receiving cavity is formed between the end of the body along the axial direction and the mounting seat, and the receiving cavity is communicated with the ink supply channel;

[0007] A writing bead is at least partially disposed in the accommodating cavity, and the writing bead is configured to abut against the mounting seat and be movable along the axial direction of the body, so that the writing bead selectively abuts against the inner wall of the body.

[0008] In some embodiments, along the radial direction of the body, the thickness of the mounting seat is B;

[0009] Among them, 300μm<B<600μm.

[0010] In some embodiments, the mounting seat is a tapered structure, the large end of the mounting seat is connected to the body, and the small end of the mounting seat is arranged toward the ink supply channel.

[0011] In some embodiments, a contact slope is provided on a side of the mounting seat facing the writing bead, and the writing bead abuts against the contact slope;

[0012] And / or, a guiding slope is provided on a side of the mounting seat facing the writing bead.

[0013] In some embodiments, the ink supply channel includes a first through hole, a buffer hole, and a second through hole, the first through hole is connected to the second through hole through the buffer hole, and the second through hole is arranged on a side of the buffer hole close to the writing bead and is connected to the accommodating cavity;

[0014] Wherein, the diameters of the second through hole, the buffer hole and the second through hole gradually decrease.

[0015] In some embodiments, the ink supply channel further includes an oil groove, and along the radial direction of the body, one end of the oil groove is communicated with the second through hole, and the other end of the oil groove is communicated with the accommodating cavity.

[0016] In some embodiments, there are multiple oil grooves and multiple mounting seats, multiple mounting seats are arranged along the circumferential direction of the body, multiple oil grooves are arranged along the circumferential direction of the body, and the mounting seat is arranged between two adjacent oil grooves.

[0017] In some embodiments, an outer wall of the body along an axial direction thereof and close to one end of the writing bead is provided with a round chamfer.

[0018] In some embodiments, the body is made of plastic material;

[0019] And / or, the writing beads are made of ceramic material.

[0020] According to the second aspect of the utility model, the writing pen provided by the embodiment of the utility model includes an ink storage tube, a connecting tube and a pen tip as described above, wherein the ink storage tube is connected to the pen tip through the connecting tube, the ink storage tube is used to store the self-erasable ink and sealant, and the sealant is arranged at one end of the ink storage tube away from the pen tip.

[0021] An embodiment of the utility model has the following advantages or beneficial effects:

[0022] The pen tip provided by the embodiment of the utility model has an ink supply channel of the body connected to the accommodating chamber, and the ink supply channel conveys self-erasing ink to the accommodating chamber. The accommodating chamber is used to accommodate a writing bead, so that the outer peripheral wall of the writing bead is adhered with self-erasing ink, which is convenient for writing. The mounting seat is located inside the body and abuts against the writing bead. The mounting seat is essentially a bowl seat part and is used to support the writing bead. The mounting seat cooperates with the pressing of the writing bead, so that the writing bead abuts against the inner wall of the body, so that a sealed state is formed between the writing bead and the inner wall of the body, and it is not easy to volatilize in a non-writing state. When the writing bead is pressed for writing, the writing bead abuts and pushes the mounting seat, so that the mounting seat is deformed relative to the body, the writing bead does not abut against the inner wall of the body, and a gap is formed between the writing bead and the inner wall of the body, which is conducive to the discharge of the self-erasing ink.

[0023] The writing pen provided by the utility model has an ink storage tube for storing self-erasable ink, and the ink storage tube delivers the self-erasable ink to the pen head through a connecting tube, so that the pen head can write corresponding handwriting with the self-erasable ink when writing. A sealant is arranged at one end of the ink storage tube away from the pen head, and the sealant is used to block the ink storage tube, so as to isolate the self-erasable ink from the air and improve the sealing performance of the self-erasable ink. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to better understand the utility model, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the utility model. In addition, related elements or components may have different settings as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each of the drawings. By describing its example embodiments in detail with reference to the drawings, the above and other features and advantages of the utility model will become more apparent.

[0025] in:

[0026] Figure 1 Shown is a schematic diagram of the structure of a writing pen according to an embodiment of the utility model;

[0027] Figure 2 What is shown is a schematic diagram of the structure of the pen tip of the embodiment of the utility model;

[0028] Figure 3 The sectional view of the pen tip of the utility model embodiment is shown. Figure 1 ;

[0029] Figure 4 The figure shows a schematic diagram of the structure of the pen head showing the ink supply channel, the mounting seat and the writing bead in the embodiment of the utility model;

[0030] Figure 5 The sectional view of the pen tip of the utility model embodiment is shown. Figure 2 .

[0031] The reference numerals are described as follows:

[0032] 100, pen tip; 200, ink storage tube; 300, connecting tube; 400, self-erasable ink; 500, sealant;

[0033] 1. Main body; 2. Mounting seat; 3. Writing beads;

[0034] 11. ink supply channel; 111. first through hole; 112. buffer hole; 113. second through hole; 114. oil groove; 12. round chamfer;

[0035] 20. Accommodating cavity. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the example embodiments of the utility model to clearly and completely describe the technical solutions in the example embodiments of the utility model. The example embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the utility model. Therefore, it should be understood that various modifications and changes can be made to the example embodiments without departing from the scope of protection of the utility model.

[0037] In the description of the present invention, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0038] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0039] Further, in the description of the present invention, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present invention are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present invention. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", or "inner", "outer", but can also be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0040] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0041] This embodiment provides a writing pen, such as Figure 1As shown, the writing pen includes an ink storage tube 200, a connecting tube 300 and a pen tip 100. The ink storage tube 200 is connected to the pen tip 100 through the connecting tube 300. The ink storage tube 200 is used to store self-erasable ink 400 and a sealant 500. The sealant 500 is arranged at one end of the ink storage tube 200 away from the pen tip 100.

[0042] In the writing pen provided in this embodiment, the ink storage tube 200 is used to store the self-erasable ink 400. The ink storage tube 200 delivers the self-erasable ink 400 to the pen head 100 through the connecting tube 300. When the pen head 100 is writing, the self-erasable ink 400 is used to write corresponding handwriting. The sealant 500 is arranged at the end of the ink storage tube 200 away from the pen head 100. The sealant 500 is used to block the ink storage tube 200, realize the isolation of the self-erasable ink 400 and the air, and improve the sealing performance of the self-erasable ink 400.

[0043] Since the self-erasing ink 400 has the characteristic of self-erasing, after the user uses the writing pen to write on various types of writing paper, the traces can automatically disappear after a certain period of time. While evaluating the effect of calligraphy practice, the time of erasing traces is saved. At the same time, the writing paper can be reused, achieving the purpose of saving paper.

[0044] The pH of the self-erasable ink 400 is usually greater than 12, and it is in a color-developing state after writing. After volatilization and contact with water, the color-developing part of the self-erasable ink 400 is reduced or the pH of the self-erasable ink 400 is reduced, and it is in a colorless state after writing, achieving the purpose of self-erasability. In addition, when the self-erasable ink 400 is stored in the ink storage tube 200, the self-erasable ink 400 is highly viscous and not easy to volatilize, which is convenient for storage. The self-erasable ink 400 is easy to volatilize and is easy to decolorize after shear thinning during writing. The self-erasable ink 400 has no large particles, ensuring that there is no residue after volatilization.

[0045] Specifically, the self-erasable ink 400 uses a strong alkaline dye-based neutral ink, and the physical and chemical index range of the self-erasable ink 400 is: viscosity 2000±500mPa·s (1.256s -1 ), thixotropic ratio 5.0±1.0(1.256 / 12.56s -1 ), surface tension 30.0±5.0mN / m, pH 13±0.5.

[0046] When the self-erasable ink 400 develops color at pH>11.0, the self-erasable ink 400 turns colorless when the pH value is adjusted to below 10.0 by adding acid and water.

[0047] The color developing factor of the self-erasable ink 400 can also gradually fade through volatilization. When applied, the thickness of the self-erasable ink 400 is about 0.1 mm. Under different temperature, humidity and wind speed environments, it will evaporate to colorless within 5 mm-30 mm.

[0048] Self-erasable ink 400 under low shear (1.256s -1 ) and viscosity>1500mPa·s, the fluidity is poor and it is not easy to volatilize; self-erasable ink 400 under high shear (383s -1 ) and the viscosity is less than 50mPa·s, with strong fluidity, easy to write and easy to evaporate and fade.

[0049] This embodiment also provides a pen tip 100, such as Figure 2-Figure 4 As shown, the pen tip 100 includes a body 1, a mounting seat 2 and a writing bead 3. The body 1 is provided with an ink supply channel 11, and the ink supply channel 11 is used to convey the self-erasable ink 400. The mounting seat 2 is provided in the body 1, and a receiving cavity 20 is formed between the end of the body 1 along the axial direction and the mounting seat 2, and the receiving cavity 20 is connected with the ink supply channel 11. The writing bead 3 is at least partially provided in the receiving cavity 20, and the writing bead 3 is configured to abut against the mounting seat 2 and can move along the axial direction of the body 1, so that the writing bead 3 selectively abuts against the inner wall of the body 1.

[0050] The pen tip 100 provided in this embodiment has an ink supply channel 11 of the body 1 connected to the accommodating chamber 20, and the ink supply channel 11 delivers self-erasable ink 400 to the accommodating chamber 20. The accommodating chamber 20 is used to accommodate the writing bead 3, so that the outer peripheral wall of the writing bead 3 is adhered with the self-erasable ink 400, which is convenient for writing. The mounting seat 2 is located inside the body 1 and abuts against the writing bead 3. The mounting seat 2 is essentially a bowl seat part and is used to support the writing bead 3. The mounting seat 2 cooperates with the pressing of the writing bead 3, and the writing bead 3 abuts against the inner wall of the body 1, so that a sealed state is formed between the writing bead 3 and the inner wall of the body 1, and it is not easy to volatilize in the non-writing state. When the writing bead 3 is pressed for writing, the writing bead 3 abuts and pushes the mounting seat 2, so that the mounting seat 2 is deformed relative to the body 1, the writing bead 3 does not abut against the inner wall of the body 1, and a gap is formed between the writing bead 3 and the inner wall of the body 1, which is conducive to the ink discharge of the self-erasable ink 400.

[0051] With the cooperation among the writing bead 3, the mounting seat 2 and the main body 1, the existence time of the trace of the writing bead 3 after writing is controlled to be 5 minutes to 30 minutes, which can leave time for evaluating the effect of practicing calligraphy, and can quickly fade, so that the paper can be reused, so as to achieve the purpose of saving paper.

[0052] The body 1 is made of plastic material, for example, the body 1 can be made of POM plastic. Compared with the existing body 1 made of metal material, the body 1 made of plastic material will not react with the strong alkaline self-erasable ink 400, and the body 1 has the advantages of low processing cost, high production capacity, good plasticity, good resilience, good writing feel, low loss, safety and environmental protection.

[0053] It can be understood that the mounting base 2 and the main body 1 are an integrally formed structure, which is formed in one step using an injection molding process, thereby reducing the time for assembling parts and saving production costs.

[0054] In one embodiment, the writing bead 3 is made of ceramic material, for example, the writing bead 3 can be made of zirconium oxide ceramic. The writing bead 3 can also be called a ceramic writing bead. Compared with the existing steel bead, the writing bead 3 made of ceramic material will not be corroded by the strong alkaline self-erasable ink 400, which prolongs the service life and improves the reliability of the writing pen.

[0055] In addition, the writing bead 3 has a surface roughness grade of Ra0.012, and has the advantages of being smooth and wear-resistant.

[0056] In one embodiment, along the radial direction of the body 1 , the thickness of the mounting seat 2 is B, wherein 300 μm<B<600 μm.

[0057] By making the thickness of the mounting seat 2 greater than 300 μm, the mounting seat 2 has a certain thickness, so that the mounting seat 2 has a certain pressure bearing capacity and wear resistance, thereby ensuring the position stability of the writing bead 3. By making the thickness of the mounting seat 2 less than 600 μm, the mounting seat 2 has a certain resilience, which is beneficial to the deformation of the mounting seat 2, thereby facilitating the self-erasable ink 400 to flow out through the gap between the writing bead 3 and the body 1.

[0058] By applying different forces and angles, the width of the trace can be controlled to form a pen tip. Specifically, when the writing bead 3 is pressed down in the writing state, when the writing pressure of the writing bead 3 is greater than 10 grams, the mounting seat 2 gradually produces a slight elastic deformation, and a gap is formed between the writing bead 3 and the inner wall of the opening end of the body 1, and the self-erasable ink 400 flows out from the gap to form a trace. When the writing load of the writing bead 3 gradually increases to 20 grams to 30 grams, the trace width reaches the maximum and the trace width no longer increases. When the writing angle of the writing bead 3 gradually decreases from 90° to 45° to 55°, the ink output of the self-erasable ink 400 gradually increases, and the line width gradually increases; if the writing angle continues to decrease, the line width gradually decreases. When the writing angle and force remain unchanged, the trace width can remain stable.

[0059] For example, when the writing pressure of the writing bead 3 is 22 grams and the writing angle is 52 degrees, the writing line width reaches the maximum value. When the deformation of the mounting seat 2 is 8 μm, the gap between the writing bead 3 and the body 1 is 6 μm.

[0060] In one embodiment, the mounting seat 2 is a tapered structure, the large end of the mounting seat 2 is connected to the body 1 , and the small end of the mounting seat 2 is arranged toward the ink supply channel 11 .

[0061] Compared with the regular block structure, the mounting seat 2 adopts a tapered structure, and the mounting seat 2 has a good flexibility effect, which is conducive to the elastic deformation of the mounting seat 2. The large end of the mounting seat 2 is connected to the body 1, so that the contact area between the mounting seat 2 and the body 1 is relatively large, and the connection stability between the mounting seat 2 and the body 1 is increased. The small end of the mounting seat 2 is arranged toward the ink supply channel 11, so that the portion of the mounting seat 2 extending to the body 1 does not occupy the space of the ink supply channel 11 as much as possible, and the ink supply effect of the ink supply channel 11 is increased.

[0062] Among them, a contact slope is provided on the side of the mounting seat 2 facing the writing bead 3, and the writing bead 3 abuts against the contact slope. The contact slope is in contact with and tangent to the outer peripheral wall of the writing bead 3. When the writing bead 3 is pressed to write, the force of the writing bead 3 on the contact slope can be decomposed into a first force along the axial direction of the body 1 and a second force along the radial direction of the body 1. Under the action of the first force, the mounting seat 2 is slightly deformed, and while ensuring that the self-erasable ink 400 can flow out through the gap between the writing bead 3 and the body 1, the self-erasable ink 400 will not leak in a large range.

[0063] A guide slope is arranged on one side of the mounting seat 2 facing the writing bead 3. The guide slope is arranged to be inclined relative to the axial direction and the radial direction of the body 1, and the guide slope plays a role in guiding and draining the self-erasable ink 400.

[0064] In one embodiment, Figure 3-Figure 4 As shown, the ink supply channel 11 includes a first through hole 111, a buffer hole 112, and a second through hole 113. The first through hole 111 is connected to the second through hole 113 through the buffer hole 112. The second through hole 113 is arranged on a side of the buffer hole 112 close to the writing bead 3 and is connected to the accommodating cavity 20.

[0065] The self-erasable ink 400 enters the accommodating cavity 20 through the first through hole 111, the buffer hole 112, and the second through hole 113 in sequence, and finally the writing bead 3 drives the writing line to form.

[0066] The diameters of the second through hole 113 , the buffer hole 112 and the second through hole 113 gradually decrease.

[0067] In this way, the diameter of the ink supply channel 11 decreases step by step, which is beneficial to the convergence of the self-erasable ink 400, and the second through hole 113, the buffer hole 112 and the step between two adjacent holes in the second through hole 113 also play a role in throttling the self-erasable ink 400 to a certain extent, reducing the risk of ink accumulation during the writing process of the writing pen.

[0068] Furthermore, the second through hole 113 , the buffer hole 112 and the second through hole 113 are coaxially arranged, and the second through hole 113 and the body 1 are coaxially arranged.

[0069] In one embodiment, the ink supply channel 11 further includes an oil groove 114 . Along the radial direction of the body 1 , one end of the oil groove 114 is connected to the second through hole 113 , and the other end is connected to the accommodating cavity 20 .

[0070] The oil groove 114 can be used to disperse the self-erasable ink 400 concentrated in the second through hole 113 to the periphery of the writing bead 3, thereby improving the distribution uniformity of the self-erasable ink 400 relative to the writing bead 3, improving the smoothness of writing, and reducing the risk of ink interruption.

[0071] In one embodiment, Figure 4-Figure 5 As shown, there are multiple oil grooves 114 and mounting seats 2, and multiple mounting seats 2 are arranged along the circumferential direction of the body 1, so that the deformation of the mounting seats 2 is uniform when the writing bead 3 is pressed. Multiple oil grooves 114 are arranged along the circumferential direction of the body 1, that is, multiple oil grooves 114 extend radially, which improves the uniformity of the circumferential distribution of the self-erasable ink 400 relative to the writing bead 3, and further improves the smoothness of writing. The mounting seat 2 is arranged between two adjacent oil grooves 114, that is, the mounting seat 2 and the oil groove 114 are arranged at intervals to ensure the synchronization of pressing deformation and ink discharge.

[0072] Exemplarily, the number of the oil grooves 114 and the mounting seats 2 is five, and the width of the oil grooves 114 along the radial direction of the body 1 is 0.07 mm to 0.09 mm.

[0073] In one embodiment, Figure 4-Figure 5 As shown, the outer wall of the body 1 along the axial direction and close to the writing bead 3 is provided with a round chamfer 12 .

[0074] When the main body 1 is manufactured, a round chamfer 12 can be formed on the outer wall of the main body 1 by injection molding. The round chamfer 12 can also be called a spherical chamfer. When writing at a low angle, for example, when the writing angle is less than 50°, the main body 1 is not easy to produce a scratching feeling with the paper, so that it has the ability to write at a large angle, thereby improving the user experience.

[0075] The writing pen provided in this embodiment is specifically a plastic tip self-erasable gel pen, and the self-erasable ink 400 is crystal blue A, and its physical and chemical index range is: density 1.098g / cm3, viscosity 1602mPa·s (1.256s -1 ), thixotropic ratio 4.9 (1.256 / 12.56s -1 ), surface tension 29.2 mN / m, pH 13.2. The self-erasable ink 400 is usually crystal blue, and dilute hydrochloric acid is added to adjust the pH to 9.5, at which time the ink becomes colorless. The diameter of the writing bead 3 is about 0.5 mm.

[0076] The following results were obtained by using a writing bead 3 with a diameter of 0.5 mm and a self-erasing neutral ink crystal blue A for matching test:

[0077] 1. Test conditions: German HUTT writing instrument was used, with a writing angle of 70°, a writing speed of 4.5 m / min, and a writing pressure of 1 N.

[0078] 2. The test results of writing performance and application performance are as follows: the average ink output of the ink storage tube 200 with an ink filling volume of 0.9g is 98mg / m, the length of the line reaches 800m-1000m, the writing line is normal, and the writing performance meets the standard requirements of neutral ballpoint pens. In other application performance tests, there are no abnormalities in low temperature resistance, storage, and dripping ink tests, intermittent writing exceeds 30 days, and other general application performance meets the standard requirements of neutral ballpoint pens.

[0079] 3. This application was tested against a gel ballpoint pen with a bullet-shaped metal pen tip of the same specification. The comparison results are shown in Table 1:

[0080] Table 1. Comparison results of special tests on plastic tip self-erasable gel pens (0.5 mm) and self-erasable neutral ink crystal blue A

[0081]

[0082]

[0083] The test methods for each special test are:

[0084] Writing lubricity: refer to relevant writing lubricity test methods.

[0085] Wear per 100 meters: The amount of settlement of the mounting base 2 before and after the test marking is divided by the length of the marking to calculate the wear per 100 meters.

[0086] Low-angle writing: The entire writing pen is at a specific low angle (50°, 45°, 40°) to the writing surface to draw a straight line manually.

[0087] Fast writing: The entire writing pen is used to quickly draw circles (writing speed > 9m / min) at a writing angle of 70°.

[0088] Impact resistance test: The entire writing pen is installed with a pen cap and dropped once in the horizontal, vertical and upside down directions on a tile floor with a drop height of 1m.

[0089] Extreme intermittent writing: In an environment of 23°C and 50% RH, the entire writing pen was removed from the cap and stored. The pen was opened after 1, 3, 7, 15, and 30 days, and the initial writing conditions were observed.

[0090] Drying resistance: Remove the cap from the entire writing pen and place it flat in a 50℃ oven. Open the pen after 1, 3, and 7 days and observe the initial writing conditions.

[0091] Storage stability over time: The entire writing pen with the cap is stored at room temperature and tested after opening the pen after 6 months.

[0092] Fading time of handwriting: Write on different papers and books at 23℃ and 50%RH, and record the time from when the trace is formed to when it completely disappears.

[0093] From the special test comparison test of matching self-erasable neutral ink crystal blue A, it can be seen that the writing pen provided by the utility model is a self-erasable neutral ballpoint pen with a plastic pen tip. Compared with the conventional self-erasable neutral ballpoint pen with a metal pen tip, it has the significant advantages of good writing feel, low overall wear, not easy to scratch paper when writing at low angles, and good pen opening performance after long-term writing.

[0094] Embodiment 2

[0095] This embodiment is similar to the first embodiment, and the only difference is the physical and chemical indexes of the self-erasable ink 400 and the size of the writing bead 3 .

[0096] The writing pen provided in this embodiment is specifically a plastic tip self-erasable gel pen, and the self-erasable gel ink is black B, and its physical and chemical index range is: density 1.086g / cm3, viscosity 2043mPa·s (1.256s -1 ), thixotropic ratio 5.5 (1.256 / 12.56s -1 ), surface tension 28.6 mN / m, pH 12.8. The ink is usually black, and dilute hydrochloric acid is added to adjust the pH to 9.2, at which time the self-erasable ink 400 becomes colorless. The entire writing pen uses a writing bead 3 with a diameter of 0.7 mm.

[0097] The thickness of the mounting seat 2 is greater than 420 μm, ensuring a certain pressure bearing capacity to ensure wear resistance and sufficient resilience. In the natural state, the writing bead 3 seals the open end of the body 1, and the self-erasable ink 400 is not easy to evaporate; when the writing bead 3 is pressed down in the writing state, when the writing pressure is greater than 15g, the mounting seat 2 produces a slight elastic deformation, and a gap is formed between the writing bead 3 and the inner wall of the body 1 to facilitate ink discharge; when the writing pressure is 28 grams and the writing angle is 48°, the writing line width reaches the maximum value. When the deformation of the mounting seat 2 is 12 μm, the gap between the writing bead 3 and the inner wall of the body 1 is 9 μm.

[0098] The following results were obtained by using a writing bead 3 with a diameter of 0.7 mm and a self-erasable neutral ink black B for matching test:

[0099] 1. Test conditions: German HUTT writing instrument was used, with a writing angle of 70°, a writing speed of 4.5 m / min, and a writing pressure of 1 N.

[0100] 2. The test results of writing performance and application performance are as follows: the average ink output of the ink storage tube 200 with an ink filling volume of 1.05g is about 130mg / m, the length of the line reaches 700m-800m, the writing line is normal, and the writing performance meets the standard requirements of neutral ballpoint pens. In other application performance tests, there are no abnormalities in low temperature resistance, storage, and dripping ink tests, intermittent writing for more than 30 days, and other general application performance meets the standard requirements of neutral ballpoint pens.

[0101] 3. This application was tested against a gel ballpoint pen with a bullet-shaped spring-shaped metal pen tip of the same specification. The comparison results are shown in Table 2:

[0102] Table 2. Comparison results of special tests on plastic tip self-erasing gel pens (0.7mm) and self-erasing neutral ink crystal blue A

[0103]

[0104] The test methods for each special test are:

[0105] Writing lubricity: refer to relevant writing lubricity test methods.

[0106] Wear per 100 meters: The amount of settlement of the mounting base 2 before and after the test marking is divided by the length of the marking to calculate the wear per 100 meters.

[0107] Low-angle writing: The entire writing pen is at a specific low angle (50°, 45°, 40°) to the writing surface to draw a straight line manually.

[0108] Fast writing: The entire writing pen is used to quickly draw circles (writing speed > 9m / min) at a writing angle of 70°.

[0109] Impact resistance test: The entire writing pen is installed with a pen cap and dropped once in the horizontal, vertical and upside down directions on a tile floor with a drop height of 1m.

[0110] Extreme intermittent writing: In an environment of 23℃50%RH, the entire writing pen was removed from the cap and stored. The pen was opened after 1, 3, 7, 15, and 30 days, and the initial writing conditions were observed.

[0111] Drying resistance: Remove the cap from the entire writing pen and place it flat in a 50℃ oven. Open the pen after 1, 3, and 7 days and observe the initial writing conditions.

[0112] Storage stability over time: The entire writing pen with the cap is stored at room temperature and tested after opening the pen after 6 months.

[0113] Fading time of handwriting: write on different papers and books at 23℃50%RH, and record the time from the formation of the trace to its complete disappearance.

[0114] From the comparison test of matching self-erasable neutral ink black B, it can be seen that the writing pen provided by the utility model is a self-erasable neutral ballpoint pen with a plastic pen head. Compared with the conventional self-erasable neutral ballpoint pen with a metal spring pen head 100, it has the advantages of good writing feel, low overall wear, and low-angle writing without scratching the paper. The writing opening performance is similar in the short term, but after long-term storage, the spring of the metal pen head reacts with the ink, causing the entire writing pen to be unable to write. In terms of the long-term preservation of the entire writing pen, the self-erasable neutral ballpoint pen with a plastic pen head provided by the utility model has obvious advantages.

[0115] It should be noted that the embodiments of the present invention are shown in the drawings and described in this specification is only an example of the principle of the present invention. It should be clearly understood by those skilled in the art that the principle of the present invention is not limited to any details or any components of the device shown in the drawings or described in the specification.

[0116] It should be understood that the utility model does not limit its application to the detailed structure and arrangement of the components proposed in this specification. The utility model can have other embodiments and can be implemented and executed in a variety of ways. The aforementioned deformation forms and modified forms fall within the scope of the utility model. It should be understood that the utility model disclosed and defined in this specification extends to all alternative combinations of two or more individual features mentioned or evident in the text and / or the drawings. All these different combinations constitute multiple alternative aspects of the utility model. The embodiments described in this specification illustrate the best known methods for implementing the utility model and will enable those skilled in the art to utilize the utility model.

[0117] Those skilled in the art will readily come up with other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variation, use, or adaptation of the present invention, which follows the general principles of the present invention and includes common knowledge or customary technical means in the art that are not disclosed in the present invention. The specification and example embodiments are to be considered as exemplary only, and the true scope and spirit of the present invention are indicated by the appended claims.

[0118] It should be understood that the present invention is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of the present invention is limited only by the appended claims.

Claims

1. A pen tip, characterized in that: include: A body, wherein an ink supply channel is provided in the body, and the ink supply channel is used to transport self-erasable ink; A mounting seat is disposed in the body, and a receiving cavity is formed between the end of the body along the axial direction and the mounting seat, and the receiving cavity is communicated with the ink supply channel; A writing bead is at least partially disposed in the accommodating cavity, and the writing bead is configured to abut against the mounting seat and be movable along the axial direction of the body, so that the writing bead selectively abuts against the inner wall of the body.

2. The writing head according to claim 1, characterized in that: Along the radial direction of the body, the thickness of the mounting seat is B; Among them, 300μm<B<600μm.

3. The writing head according to claim 1, characterized in that: The mounting seat is a tapered structure, the large end of the mounting seat is connected to the body, and the small end of the mounting seat is arranged toward the ink supply channel.

4. The writing tip according to claim 3, characterized in that: A contact slope is provided on one side of the mounting seat facing the writing bead, and the writing bead abuts against the contact slope; And / or, a guiding slope is provided on a side of the mounting seat facing the writing bead.

5. The writing head according to claim 1, characterized in that: The ink supply channel comprises a first through hole, a buffer hole, and a second through hole, wherein the first through hole is connected to the second through hole through the buffer hole, and the second through hole is arranged on a side of the buffer hole close to the writing bead and connected to the accommodating cavity; Wherein, the diameters of the second through hole, the buffer hole and the second through hole gradually decrease.

6. The writing head according to claim 5, characterized in that: The ink supply channel also includes an oil groove. Along the radial direction of the body, one end of the oil groove is communicated with the second through hole, and the other end is communicated with the accommodating cavity.

7. The writing head according to claim 6, characterized in that: There are multiple oil grooves and multiple mounting seats, multiple mounting seats are arranged along the circumferential direction of the body, multiple oil grooves are arranged along the circumferential direction of the body, and the mounting seat is arranged between two adjacent oil grooves.

8. The writing tip according to any one of claims 1 to 7, characterized in that: The outer wall of the body along the axial direction and close to one end of the writing bead is provided with a round chamfer.

9. The writing tip according to any one of claims 1 to 7, characterized in that: The body is made of plastic material; And / or, the writing beads are made of ceramic material.

10. A writing pen, characterized in that: It comprises an ink storage tube, a connecting tube and a pen tip as described in any one of claims 1 to 9, wherein the ink storage tube is connected to the pen tip through the connecting tube, the ink storage tube is used to store the self-erasable ink and a sealant, and the sealant is arranged at one end of the ink storage tube away from the pen tip.

Images