JP2017119406A - Pressure type writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a pressure type writing instrument in which a pressure can be applied to a rear end of an ink composition for the writing instrument at only the time of writing.SOLUTION: A pressure type writing instrument in which a ball point pen refill is movable provided on a rear side of a barrel and is energized to a front end side of the barrel by a resilient member provided in the barrel, a pressurizing mechanism moves the ball point refill rearward in the state that a front end part of a ball-point pen tip is projected from a front end of the barrel thereby pressure-welding a rear end part of an ink storage cylinder to an airtight part provided in the barrel, and compresses a closed space thereby airtightly applying a pressure to a rear end of ink composition for the writing instrument.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a pressure-type writing instrument that applies pressure to the rear end of the ink composition for a writing instrument by a pressure mechanism provided in the shaft cylinder in a state where the front end portion of the ballpoint pen tip protrudes from the front end of the shaft cylinder. .

  Conventionally, a pressure mechanism is provided at the rear end portion of the ink containing tube. For example, as disclosed in Japanese Unexamined Patent Publication No. 2000-335173 “Ball Pen”, the inside of the ink filling tube is interlocked with the pushing operation of the knock mechanism. For example, a pressure-type writing instrument in which a pressure mechanism is operated by pressing a knocking body, such as a structure to be in a pressurized state, or a cap as disclosed in, for example, “Application Tool” in Japanese Utility Model Publication No. 6-16088. There is also known a pressure-type writing instrument in which a pressure mechanism is operated by being fitted to a cylinder rear end.

JP 2000-335173 A Japanese Utility Model Publication No. 6-16088

  However, in a pressure-type writing instrument such as a patent document, after the pressure mechanism is operated, a pressure is always applied to the rear end of the ink, so that ink leakage from the tip end tends to occur. Therefore, the ink leakage was suppressed by using an ink composition for a writing instrument having a high ink viscosity in advance for the pressure-type writing instrument.

  In Patent Document 2, the pressure state can be set by attaching the cap. However, in order to maintain the pressure state after the cap is removed by the valve mechanism, as in Patent Document 1, it is always performed during writing. The ink viscosity and its blending were performed on the premise that pressure was applied to the rear end of the ink composition for writing instruments.

  An object of the present invention is to obtain a pressure-type writing instrument that can apply pressure to the rear end of the ink composition for writing instruments only at the time of handwriting formation.

  In order to achieve the above object, the present invention comprises a ballpoint pen tip filled in a front end portion of an ink containing cylinder and a ballpoint pen refill filled with an ink composition for a writing instrument in a shaft cylinder. A pressure-type writing instrument that applies pressure to the rear end of the ink composition for a writing instrument by a pressurizing mechanism provided in the shaft cylinder with a front end portion protruding from the front end of the shaft cylinder, wherein the ballpoint pen refill is the ballpoint pen With the front end portion of the tip protruding from the front end of the shaft tube, the tip member is movably disposed on the rear side of the shaft tube, and is urged toward the front end side of the shaft tube by a resilient member disposed in the shaft tube. The pressurizing mechanism moves the ballpoint pen refill rearward with the front end portion of the ballpoint pen tip protruding from the front end of the shaft tube, so that the rear end portion of the ink containing tube is moved to the shaft tube. Compressing the pressure and sealed space sealed portion provided in, characterized in that it is a pressure mechanism for applying pressure to the rear end of the ink composition for a writing instrument in a closed. In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite side.

  The pressure applied to the rear end of the ink composition for a writing instrument is characterized by being higher than 1000 hPa and not higher than 1500 hPa when the atmospheric pressure is 1000 hPa.

  The ballpoint pen refill is urged to the rear side of the shaft tube by a second projecting body provided in the shaft tube, and is arranged to be movable back and forth, and operates the retracting mechanism provided in the shaft tube. Thus, the ball-point pen tip is a retractable ball-point pen provided so as to be retractable from the front end of the shaft tube.

  The ink composition for a writing instrument is a thermochromic ink containing at least a thermochromic microcapsule pigment, and the handwriting is generated by frictional heat generated by rubbing the handwriting of the ballpoint pen refill on the pressureable writing instrument. It is characterized by comprising a friction member that discolors heat.

  In addition, the pressure applied to the rear end of the ink composition for a writing instrument can be measured by measuring the volume change amount of the compression space before and after pressing. At this time, the calculation is performed at 20 ° C. and atmospheric pressure of 1000 hPa.

  According to the present invention, it is possible to obtain a pressure-type writing instrument that can apply pressure to the rear end of the ink composition for writing instruments only at the time of handwriting formation.

It is a longitudinal cross-sectional view which shows the state (non-pressurization state) where the ball-point pen tip of the pressurization type writing instrument of Example 1 was immersed. It is a longitudinal cross-sectional view which shows the state (non-pressurization state) which the ball-point pen tip in FIG. 1 protruded. It is a longitudinal cross-sectional view which shows the state (pressurization state) in which the writing pressure was added in FIG. FIG. 4 is an enlarged vertical cross-sectional view of a main part, partially omitted in FIGS. 2 and 3.

  According to the present invention, first, the ballpoint pen refill is disposed movably on the rear side of the shaft tube and disposed in the shaft tube with the front end portion of the ballpoint pen tip protruding from the front end of the shaft tube. The elastic member is biased toward the front end side of the shaft cylinder, and the pressure mechanism moves the ball pen refill rearward in a state where the front end portion of the ballpoint pen tip protrudes from the front end of the shaft cylinder. And pressurizing the rear end portion of the ink containing cylinder to the sealed portion provided in the shaft cylinder and compressing the sealed space to apply pressure to the rear end of the ink composition for the writing instrument. By adopting a mechanism, when not writing (no pressure applied), no pressure is applied (no pressure is applied to the trailing edge of the ink composition for writing instruments), so ink leaks from the tip of the tip. Can be reliably prevented. Furthermore, since pressure is applied by pressure, the pressure is reset for each stroke, so that the pressure applied during writing is stabilized, and the density change hardly occurs.

  Next, when the atmospheric pressure is 1000 hPa, the pressure applied to the rear end of the writing instrument ink composition is higher than 1000 hPa and 1500 hPa or less, so that the ink consumption can be easily obtained and the pressure is increased. Ink leakage from the front end of the chip in the state is suppressed. Furthermore, it is preferable to set it as 1200 hPa or less.

  Next, the ball pen refill is arranged to be urged and moved back and forth behind the shaft cylinder by a second projecting body provided in the shaft cylinder, and a retracting mechanism provided in the shaft cylinder is provided. By operating, the ballpoint pen tip is a retractable ballpoint pen that can be retracted from the front end of the shaft tube, so it is easy to switch between the standby state (immersion of the pen tip) and the writing state (protrusion of the pen tip). Even if left in a writing state, it is non-pressurized (no pressure is applied to the rear end of the ink composition for writing instruments), and ink leakage from the tip of the tip occurs. There is no.

  The ink composition for writing instruments used in the present invention is not particularly limited to oil-based inks, water-based inks, shear thinning inks, etc., but when the writing tip is detached from the paper surface even in the writing state (writing brush In a state where no pressure is applied, no pressure is applied. Therefore, the ink can be suitably used for ink having a relatively low viscosity, and an increase in ink outflow due to pressurization and an improvement in handwriting density can be obtained. It is preferably used for thermochromic inks containing capsule pigments. This is because the thermochromic ink containing microcapsule pigment contains a coloring material in the capsule, so the handwriting density tends to be thinner than other inks for writing instruments, and the handwriting density is increased. It is conceivable to increase the amount of the microcapsule pigment used as a colorant, to increase the particle size, and to add a large amount of colorant contained in the capsule. This is because if the amount of the material is excessively increased, the temporal stability and thermal discoloration may be deteriorated.

The ink viscosity of the ink composition for a writing instrument is set to 600 mPa · s to 2000 mPa · s at 20 ° C. and a shear rate of 3.84 sec ⁻¹ , and 10 mPa · s to 100 mPa · s at a shear rate of 384 sec ^−1. Suppresses ink leakage from the front end of the chip in a pressed state and improves writing quality. Furthermore, at 20 ° C. and a shear rate of 3.84 sec ⁻¹ , 1000 to 1500 mPa · s and 30 mPa · s to 80 mPa · s at a shear rate of 384 sec ⁻¹ are preferable.

  The microcapsule pigment can be blended in an amount of 5 to 40% by mass, preferably 10 to 40% by mass, and more preferably 15 to 35% by mass with respect to the total amount of the ink composition. If it is less than 5% by mass, the color density is insufficient, and if it exceeds 40% by mass, the ink outflow tends to be reduced and the writing performance tends to be impaired.

  The color change temperature due to frictional heat of the thermochromic ink is set to 25 ° C to 95 ° C (preferably 36 ° C to 95 ° C). That is, in this embodiment, the high temperature side discoloration point [complete decoloring temperature (t4)] is set in a range of 25 ° C. to 95 ° C. (preferably 36 ° C. to 90 ° C.), and the low temperature side discoloration point is set. It is effective to set [complete color development temperature (t1)] in the range of −30 ° C. to + 20 ° C. (preferably −30 ° C. to + 10 ° C.). Thereby, it is possible to effectively maintain the color exhibited in the normal state (daily life temperature range), and it is possible to easily change the handwriting by the reversible thermochromic ink with the frictional heat generated by the friction part.

  Further, the ink composition for a writing instrument is a thermochromic ink containing at least a thermochromic microcapsule pigment, and frictional heat generated by rubbing the handwriting of the ballpoint pen refill on the pressure-type writing instrument, It is preferable to provide a friction member that thermally changes the handwriting. The installation location of the friction member is not particularly limited, such as the front end portion, the rear end portion, the side surface portion, the surface of the clip, the operation portion, etc. of the shaft tube, and may be two or more places, adhesion, fusion, It can also be provided by fitting, two-color molding or the like. The friction member is preferably made of a synthetic resin (rubber or elastomer) having elasticity, for example, silicone resin, SBS resin (styrene-butadiene-styrene copolymer), SEBS resin (styrene). -Ethylene-butylene-styrene copolymer), fluorine resin, chloroprene resin, nitrile resin, polyester resin, ethylene propylene diene rubber (EPDM) and the like. The synthetic resin having elasticity is not made of a highly wearable elastic material (such as an eraser), but is made of a low wear elastic material that hardly generates wear debris during friction.

  Further, it is preferable that the concentration of the handwriting of the ball-point pen refill in the pressurized state satisfies 1.2 times or more of the handwriting concentration in the non-pressurized state, so that the presence or absence of pressurization can be confirmed from the handwriting. More preferably, 1.5 to 5.0 times and 1.5 to 4.0 times are more preferable. Since the handwriting density before pressurization can be visually recognized, it is possible to write in a state where no pressure is applied. Therefore, the handwriting density of the ballpoint refill without pressurization is 0.2-0. 7 is preferable, and 0.3 to 0.6 is more preferable.

Furthermore, when the ink consumption value per unit area of the ballpoint refill is 0.7 to 1.5 mg / cm ² , the above-described handwriting density can be easily obtained. Further, the ink consumption value is preferably 0.7 to 1.2 mg / cm ² . In order to obtain a good handwriting, it is important to make the handwriting width smaller than the ball diameter, and the handwriting width in a pressurized state is preferably 65% to 95% of the ball diameter, more preferably. Is 70% to 90%.

  The ink consumption per 10 m was measured according to JIS standard S6054 (20 ° C., writing angle 70 °, writing speed 4 m / min, self-revolution, writing load 100 gf, underlay stainless steel plate). The ink remaining amount was measured after writing and obtained by calculation. Moreover, such a test is continuously performed 5 times (total 50m), a total of 5 times, and it calculates | requires by the average value.

  The handwriting width and handwriting density are in accordance with ISO 13660, and the handwriting width (mm) is within the range of 60% or less of the reflectance, and the handwriting density is within the range of 75% or less of the reflectance. The handwriting width and handwriting density in the present invention can be obtained by a personal image quality evaluation apparatus (QEA (Quality Engineering Associates, PIAS-II)). In the present invention, 15 points are measured, and the average value is obtained.

Ink viscosities were measured at a shear rate of 3.84 sec ⁻¹ (10 rpm) and a shear rate of 384 sec ⁻¹ (100 rpm) in a 20 ° C. environment using a Brookfield DV-II viscometer (Cone Rotor CPE-42). The ink viscosity can be measured under conditions.

  In addition, as a ballpoint pen tip, a tip formed by holding a ball in a ball holding portion in which the vicinity of the tip of a metal pipe is pressed and deformed inward from the outer surface, or a metal material is formed by cutting with a drill or the like A chip that holds the ball in the ball holding part, or a ball that is held in a chip formed by cutting a metal pipe or metal material is applied forward by a coil spring. it can.

  Moreover, the said ball | bowl can apply the general purpose thing which consists of a cemented carbide alloy, stainless steel, a ruby, a ceramic, etc., and the thing of the range of diameter 0.1mm-2.0mm, Preferably 0.2mm-1.2mm is suitable. Used for. In particular, when the ball diameter is a small diameter of 0.5 mm or less, the number of rotations of the ball with respect to the writing distance is large, and it becomes difficult to write on the non-penetrating surface. It is most effective when used for ballpoint pen refills of 0.4 mm, 0.38 mm, and 0.3 mm.

  Although the shape of the ballpoint pen tip is not particularly limited, the chip body has an ink circulation hole formed in the center of the bottom wall of the ball holding chamber, and a plurality of ink circulation grooves extending radially from the ink circulation hole. A ball seat having a substantially arc surface shape is provided on the bottom wall of the ball holding chamber, a ball having a diameter of 0.5 mm or less is placed on the ball seat, and a part of the ball is placed at the tip end edge of the chip It is more stably projected by being held in a freely projecting manner and forming a substantially arc-shaped sealing surface on the inner wall of the front end portion of the chip, and by making the vertical clearance of the ball 15 to 40 μm. This is preferable because the handwriting and the wear of the ball seat can be suppressed.

  This is considered to be because the contact area between the ball and the chip body is increased by providing a substantially circular arc-shaped ball seat on the bottom wall of the ball holding chamber, so that wear of the seat is suppressed. However, since the space (volume) excluding the ball in the ball holding chamber decreases by forming the ball seat, the ink consumption tends to decrease, but in the pressure-type thermochromic writing instrument of the present invention, A large amount of ink can be discharged by the applied pressure. In particular, in a ballpoint pen in which a ball having a diameter of 0.5 mm or less is placed on the ball seat, the wear of the ball seat is significant, so the effect of the present invention is remarkable, and the vertical clearance of the ball is 15 to 40 μm. Preferably, by setting the thickness to 20 to 30 μm, it is possible to suppress stable handwriting and ink leakage from the tip of the chip.

  The shaft cylinder of the present invention may be a ballpoint pen refill that accommodates the refill in the shaft cylinder, or the shaft cylinder with a tip mounted on the front end itself is an ink storage cylinder. The ink may be directly filled in. Further, as the shaft cylinder and the ink storage cylinder, it is preferable to use a transparent, colored transparent, or translucent molded body because the ink color, the remaining amount of ink, and the like can be confirmed.

  Specifically, the ink storage cylinder for storing the ink composition for a writing instrument is, for example, a molded body made of a thermoplastic resin such as polyethylene, polypropylene, polyethylene terephthalate, or a metal material, and has a low ink evaporation property. Polypropylene is preferably used in terms of productivity. In addition, in order to maintain the pressurized state, a gas barrier material such as EVOH can be used as appropriate, such as a single layer, a multilayer, or other materials.

  Furthermore, an ink follower (liquid stopper) can be arranged at the rear end of the ink composition for writing instruments. As the ink follower, either liquid or solid can be used, and examples of the liquid ink follower include non-volatile media such as polybutene, α-olefin oligomer, silicone oil, and refined mineral oil. Silica, aluminum silicate, swellable mica, fatty acid amide and the like may be added to the medium. Moreover, a resin molding is mentioned as a solid ink follower. The liquid and solid ink followers can be used in combination.

Example 1
The pressure-type writing instrument 1 shown in FIGS. 1 to 4 detachably press-fits a ball-point refill 16 disposed in a shaft cylinder 2 into a piston 9 via a holder 7 and a ball-point refill holding member 8. The holder 7, the piston 9, the refill holding member 8, and the ballpoint pen refill 16 are urged by the coil spring 13 through the receiving member 6 and are slidably arranged in the rear end direction of the shaft cylinder 2. 1 is a pressure-type writing instrument 1 equipped with a tip-out mechanism.

  A friction member 21 made of styrenic elastomer is integrally formed with the shaft cylinder 2 at the front end portion of the shaft cylinder 2 by two-color molding, and the handwriting is generated by friction heat generated by rubbing the handwriting of the ballpoint pen refill 16. Can be discolored (discolored).

  The ballpoint pen refill 16 is composed of the ink composition 19 for a writing instrument (thermochromic ink) 19 and the ink composition 19 for a writing instrument obtained by applying shear thinning viscosity obtained by blending the following inks to a transparent ink containing cylinder 17 made of PP resin. A grease-like ink follower 20 that follows the consumption of ink is directly accommodated at the rear end, and a ballpoint pen tip 18 that rotatably holds a ball (φ0.38 mm) in the front end opening of the ink accommodating cylinder 17. This is obtained by press-fitting the rear end portion.

  When the knock body 4 is pressed in the direction of the front end opening 2A of the shaft cylinder 2 (in the direction of arrow F in FIG. 1), the outer wall of the knock body 4 is slidably disposed in the sliding hole 2B of the shaft cylinder 2. The locking part 4A formed on the clip 5 is locked to the locked part 5A at the tip of the clip 5, so that the front end of the ballpoint pen tip 18 of the ballpoint pen refill 16 protrudes from the front end opening 2A of the front shaft 2. When the state is maintained and the rear end portion of the clip 10 is pressed to release the locking portion 4A locked to the locked portion 5A of the clip 5, the ballpoint pen tip 18 is moved to the front shaft by the biasing force of the coil spring 13. 2 is a retractable mechanism that can be immersed in the front end opening 2A.

  The rear end portion of the ball-point pen refill 16 is press-fitted and held by a ball-point refill holding member 8 press-fitted into the piston 9, and the inside and outside of the piston 9 are communicated with each other through an air hole formed in the rear end portion of the piston 9. Further, the receiving member 6 is disposed so as to cover the piston 9, and the second coil spring 14 is interposed between the sealing member holding member 10 provided behind the piston 9 and the sealing member holding member 10 and the receiving member 6. A third coil spring 15 is provided.

  The pressurizing mechanism and the retracting mechanism will be described in detail. The front end portion of the ballpoint pen tip 18 resists the urging force of the second coil spring 14 and the third coil spring 15 by the writing pressure from the position protruding from the front end of the shaft tube 2. When the ballpoint pen refill 16 is moved backward (in the direction of arrow G), the ballpoint pen refill 16, the refill holding member 8, and the piston 9 first move backward in conjunction with each other. Specifically, first, the second coil spring 14 is compressed, and the sealing member 11 disposed on the receiving member 6 is pressed and sealed. Further, when the piston 9 moves rearward, the third coil spring 15 is compressed, the sealing member 11 is deformed, the space in the piston 9 and the rear end portion of the ink containing cylinder 17 is compressed, and the ball pen refill 16 for writing instrument is used. Pressure can be applied to the rear end of the ink follower 20 disposed at the rear end of the ink composition 19. The load necessary for compressing the second coil spring 14 is set to be smaller than the load necessary for compressing the third coil spring 15.

  In addition, when the writing pressure is released (when the writing instrument is not used), first, the third coil spring returns to the original state, and then the second coil spring returns to the original state. Therefore, the ball pen refill 16 is moved toward the front end of the shaft tube. Move (return to the original). Specifically, the sealing member 11 that has been pressed and deformed by the rear end surface of the piston 9 is also restored to its original shape, the air hole of the piston 9 is opened, and the rear end portion of the ball pen refill 16 is further formed in the piston 6. Release the seal of to make it the same pressure as the atmospheric pressure. The pressure applied to the rear end of the writing instrument ink composition 19 via the ink follower 20 was 1020 hPa.

  Ink formulation 1 was prepared by adding 27 parts of a thermocapsule color-changeable color memory microcapsule pigment (previously cooled to -23 ° C. or less to develop a black color), 0.33 part of xanthan gum (shear thinning agent), A water-based ink vehicle comprising 10.0 parts urea, 10 parts glycerin, 0.6 parts nonionic surfactant, 0.1 part modified silicone antifoaming agent, 0.2 part antifungal agent, and 51.77 parts water. An ink composition (thermochromic ink) for writing instruments was prepared by uniformly dispersing. The handwriting showed a black color at room temperature (25 ° C.), and when the characters were scraped using a friction member, the characters disappeared and became colorless, and this state could be maintained at room temperature. In addition, when the paper surface after erasing was put into a freezer and cooled to a temperature of −23 ° C. or lower, the color changed to black again, and the behavior could be reproduced repeatedly.

In this embodiment, for the sake of convenience, a mechanism for causing the front end of the tip to protrude from the front end opening of the shaft cylinder by rear end knocking and clip operation is illustrated, but the knock type, sliding type, rotation, etc. are not particularly limited. Absent. Further, it is sufficient that at least one ballpoint pen refill is accommodated in the shaft cylinder. For example, a configuration in which a plurality of ballpoint pen refills are accommodated in the shaft cylinder may be employed.

  The pressure-type writing instrument of the present invention can be widely used as a pressure-type writing instrument such as an ink color, a single type, or a double type, and can be suitably used particularly for black thermochromic ink.

DESCRIPTION OF SYMBOLS 1 Pressure type writing instrument 2 Shaft cylinder 4 Knock body 5 Clip 6 Receiving member 7 Holder 8 Refill holding member 9 Piston 10 Sealing member holding member 11 Sealing member 13 Coil spring 14 Second coil spring 15 Third coil spring 16 Ball-point pen refill 17 Ink accommodation Tube 18 Ball-point pen tip 19 Ink composition for writing instrument 20 Ink follower 21 Friction member

Claims (4)

A ballpoint pen tip and a ballpoint pen refill filled with a writing instrument ink composition inside are accommodated in the shaft cylinder, and the front end portion of the ballpoint pen tip protrudes from the shaft cylinder front end. A pressure-type writing instrument that applies pressure to the rear end of the ink composition for a writing instrument by a pressure mechanism provided in the shaft cylinder, wherein the ball-point pen refill protrudes from the front end of the ball-point pen tip. In a state, it is movably disposed on the rear side of the shaft tube, and is urged toward the front end side of the shaft tube by a resilient member disposed in the shaft tube. The ball pen refill is moved backward in a state where the front end portion protrudes from the front end of the shaft cylinder, so that the rear end portion of the ink containing cylinder is pressed and sealed to the sealing portion provided in the shaft cylinder. Compressing between, pressurized writing instrument, characterized in that the rear end of the ink composition for a writing instrument is a pressure mechanism for applying pressure to the sealing. 2. The thermochromic pressure-type writing instrument according to claim 1, wherein the pressure applied to the rear end of the ink composition for a writing instrument is higher than 1000 hPa and 1500 hPa or lower when the atmospheric pressure is 1000 hPa. The ball-point pen refill is arranged to be urged and movable back and forth behind the shaft cylinder by a second projecting body provided in the shaft cylinder, and operates a retracting mechanism provided in the shaft cylinder. The pressure-type writing instrument according to claim 1, wherein the ball-point pen tip is a retractable ballpoint pen that can be protruded and retracted from a front end of the shaft tube. The ink composition for a writing instrument is a thermochromic ink containing at least a thermochromic microcapsule pigment, and the handwriting is generated by frictional heat generated by rubbing the handwriting of the ballpoint pen refill on the pressureable writing instrument. The pressure-type writing instrument according to any one of claims 1 to 3, further comprising a friction member that discolors heat.

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