JP2024062225A - Writing implement padding and writing implements - Google Patents

Abstract

To provide an inner cotton for a writing instrument that can contribute to a recycling-oriented society, and a writing instrument in which the inner cotton for the writing instrument (ink reservoir) can be easily replaced and the inner cotton can be reused.SOLUTION: The inner cotton for the writing instrument of the present invention is made of a porous material made from pulp. The writing instrument is a writing instrument A that includes a tip shaft 20 having a pen tip 60 and a rear shaft 30 in which an inner cotton 10 having the above structure is housed, in which by moving the rear shaft 30 straight backward, the inner cotton 10 and the pen tip 60 are separated. The writing instrument A has a structure in which the inner cotton 10 can be removed by releasing a slide member 50 provided on the rear shaft 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to a writing instrument with ink reservoir that can be easily replaced and reused, contributing to a recycling-oriented society.

The 3Rs, a collective term for the three Rs of Reduce, reducing waste, Reuse, and Recycle, which are the three Rs of Reduce to reuse waste, Reuse to reuse usable items, and Recycle to reuse waste as a resource, have been advocated for some time.
Writing implements have also traditionally been made from materials such as resin and metal, but there is a demand for them to be replaced with materials that are easier to recycle.
Additionally, among the 17 goals of the Sustainable Development Goals (SDGs) adopted at the United Nations Summit is ensuring sustainable production and consumption patterns, which calls for a significant reduction in waste generation. From the perspective of the SDGs and other factors, there is an increasing need to reuse writing instruments after use, which will contribute to a recycling-oriented society.

2. Description of the Related Art There are known writing implements, such as batting-type writing implements, that can be reused by replacing the batting filled with ink.
For example, 1) a writing instrument in which a storage section for storing batting filled with ink is formed inside the barrel, a part of the barrel is screwed together so that it can be separated, and the separated part forms an opening of the storage section, and the barrel can be separated to allow the batting in the storage section to be refilled with ink or the batting to be replaced, the writing instrument is characterized in that the outer periphery of at least one end of the barrel is covered with an elastic body, the elastic body being attached to the shorter barrel side of the separated barrels, and the elastic body being molded integrally with the resin molded product of the barrel when the barrel is molded (see, for example, Patent Document 1).

2) A cartridge for storing batting that holds ink or coating liquid for a writing instrument or applicator, etc., has a cartridge shaft that is open on one side and serves as a batting storage container, and a cap that fits onto the open end of the cartridge shaft to seal it, and a seal is formed to keep the batting airtight at the fitting portion between the cartridge shaft and the cap, and multiple ribs are formed inside the cap to hold the batting by sandwiching it, and multiple ribs are formed inside the cartridge shaft to hold the batting by sandwiching it, and a batting storage cartridge (see, for example, Patent Document 2) has been disclosed, which is characterized in that the batting retention force of the ribs of the cap is greater than the batting retention force of the ribs of the cartridge shaft.

Also, 3) a batting storage container is disclosed that is used interchangeably with a writing instrument, and includes a batting made of a fiber processed body impregnated with ink, a container body in which the batting is stored, and a cap that can be detachably fitted to the container body, and is characterized in that a plurality of battings are stored inside, abutment parts are provided on the bottom surface of the container body against which the rear ends of the battings abut in the front-rear direction, and the positions of the abutment parts in the front-rear direction are different (for example, see Patent Document 3).
4) A writing instrument in which all of the resin components used are made of the same material and grade is disclosed (see, for example, Patent Document 4).

However, in the writing instruments with replaceable padding used in the above Patent Documents 1 to 4, the padding itself is made of plastic such as resin fiber, and from the perspective of moving away from plastic and achieving the SDGs, it was desirable to make the padding from environmentally friendly materials.
Furthermore, the padding replacement structures described in the above Patent Documents 1 to 4 have problems such as the time required for replacement, and there is a strong demand for structures that allow for even easier replacement.

JP 2003-39878 A (claims, Figs. 1, 3, etc.) JP 2003-80887 A (claims, Figs. 1 to 4, etc.) JP 2020-100417 A (Claims, FIG. 1, etc.) JP 2000-25381 A (Claims, etc.)

In light of the current state of the prior art, the present invention seeks to resolve this issue, and aims to provide a writing instrument with padding that makes effective use of waste paper and other materials, and a writing instrument that can be easily replaced so that the padding can be reused, with the aim of contributing to a recycling-oriented society.

As a result of extensive research into solving the above-mentioned problems, the inventors discovered that by producing a batting with a specific structure made from pulp, and by using a writing instrument that allows the batting to be easily replaced, it is possible to obtain the batting for a writing instrument and the writing instrument that meet the above-mentioned objectives, and thus completed the present invention.

That is, the filling for a writing instrument of the present invention is characterized in that the filling is made of a porous material made of pulp.
The writing instrument of the present invention is a writing instrument comprising a front barrel having a nib and a rear barrel containing a filler material of the above-described configuration, and is characterized in that the filler material and the nib can be separated by moving the rear barrel in a straight line to the rear.
The writing instrument preferably has a structure in which the padding can be removed by releasing a sliding member provided on the rear barrel.
The writing implement preferably has a structure in which the inner lining protrudes from the outer diameter of the barrel of the front barrel when the rear barrel moves rearward.

According to the present invention, it is possible to provide a writing instrument batting that can promote environmental friendliness by eliminating plastic and increasing the utilization rate of waste paper, thereby contributing to a recycling-oriented society. It is also possible to provide a writing instrument in which the batting (ink reservoir) can be easily replaced, making the batting reusable.
The objects and advantages of the invention will be realized and obtained by means of the elements and combinations particularly pointed out in the claims. Both the foregoing general description and the following detailed description are exemplary and explanatory but are not restrictive of the invention as claimed.

1A is a front view showing an example of a writing instrument equipped with the padding for a writing instrument of the present invention, and FIG. 2A is a perspective view of the writing instrument of FIG. 1 with a padding unit for the writing instrument removed, FIG. 2B is a front view of FIG. 2A, and FIG. 2C is a vertical cross-sectional view of FIG. 2B. 3A is a perspective view of the writing instrument of FIG. 2 with the padding removed, FIG. 3B is a front view of FIG. 3A, and FIG. 3C is a vertical cross-sectional view of FIG. 3B. FIG. 11 is a parts diagram of the tip barrel to which the pen tip is attached, where (a) is a perspective view from the front, (b) is a perspective view of the tip barrel from the rear, (c) is a right side view, (d) is a front view, (e) is a left side view, (f) is a vertical cross-sectional view, and (g) is a perspective view from the rear. FIG. 1 is a component diagram of a batting unit (rear shaft) for a writing instrument, where (a) is an oblique view seen from the front, (b) is a plan view, (c) is an oblique view seen from the front, (d) is a cross-sectional view, (e) is a left side view, (f) is a front view, (g) is a right side view, and (h) is a longitudinal cross-sectional view. 1A is a component diagram of the mounting member, in which (a) is a perspective view seen from the front upper surface side, (b) is a plan view, (c) is a perspective view seen from the rear upper surface side, (d) is a horizontal cross-sectional view, (e) is a left side view, (f) is a front view, and (g) is a vertical cross-sectional view. 1A is a component diagram of a slide member, where (a) is a perspective view seen from the front side, (b) is a plan view, (c) is a perspective view seen from the rear side, (d) is a left side view, (e) is a vertical cross-sectional view, (f) is a right side view, and (g) is a horizontal cross-sectional view. 1A and 1B are drawings showing another example of a writing instrument equipped with the writing instrument padding of the present invention, in which (a) is a left side view, (b) is a front view, (c) is a right side view, (d) is a longitudinal cross-sectional view, and (e) is a transverse cross-sectional view. 9A, 9B, and 9C are diagrams showing a state in which the rear shaft of the writing implement of FIG. 8 has been slid rearward, in which FIG. 9A is a plan view, FIG. 9B is a front view, and FIG. 9C is a vertical cross-sectional view. 10A, 10B, and 10C are diagrams showing a state in which the padding case of the writing instrument of FIG. 9 has been slid, where FIG. 11A, 11B, and 11C are drawings showing a state in which the padding has been lifted by a lifting member (pillow member) from the state of the writing implement in FIG. 10, making it possible to easily replace the padding, where (a) is a plan view, (b) is a front view, and (c) is a longitudinal cross-sectional view. 9A and 9B are part diagrams of the tip barrel to which the nib of the writing instrument in Figure 8 is attached, in which (a) is a perspective view from the front side, (b) is a perspective view of the tip barrel from the rear side, (c) is a plan view, (d) is a left side view, (e) is a front view, (f) is a right side view, and (g) is a vertical cross-sectional view. 9A and 9B are component diagrams of the rear barrel of the writing instrument in FIG. 8, in which (a) is a perspective view from the front side, (b) is a plan view, (c) is a left side view, (d) is a front view, (e) is a cross-sectional view along the x-x line of (d), (f) is a right side view, and (g) is a vertical cross-sectional view. 9A and 9B are component diagrams of a padding case for attaching the padding of the writing instrument in FIG. 8, in which (a) is a perspective view from the front, (b) is a perspective view from the rear, (c) is a plan view, (d) is a left side view, (e) is a front view, (f) is a right side view, and (g) is a vertical cross-sectional view. 5A and 5B are component diagrams of a lifting member (pillow member), in which FIG. 5A is a perspective view seen from the front side, and FIG. 5B is a perspective view seen from above the front side.

Hereinafter, the embodiments of the present invention will be described in detail with reference to the drawings. However, it should be noted that the technical scope of the present invention is not limited to the embodiments described in detail below, but extends to the inventions described in the claims and their equivalents.
In each drawing of the writing instrument etc. equipped with the padding for a writing instrument of the present invention, the "front" of the writing instrument and its components refers to the direction of the tip of the writing instrument, the "rear" refers to the opposite direction, the "axial direction" refers to the direction of the axis that runs from the front to the rear of the writing instrument body (barrel), and the "transverse direction" refers to the direction perpendicular to the axial direction. Also, the reference numerals commonly used in each drawing represent the same configuration or member even if not specifically mentioned in the description of each drawing.

(Filling for writing instruments)
The padding for a writing instrument of the present invention is characterized in that the padding is a porous material made of pulp.
Pulp that can be used may be recycled pulp, and recycled pulp may be made from recycled paper or waste paper.
In addition, the recycled pulp that can be used in the present invention includes waste paper pulp obtained by disintegrating waste paper and deinked pulp obtained by removing ink from waste paper after disintegrating the waste paper. Examples of waste paper that can be used as a raw material for recycled pulp include newspapers, flyers, magazines, books, office paper, envelopes, thermal paper, carbonless paper, and other printed paper generated by copiers and office automation equipment. In particular, waste magazine paper containing adhesives such as adhesives, adhesives, adhesive tapes, and magazine back glue can also be used as a raw material for the recycled pulp of the present invention.

The density of the pulp is preferably 10 to 30% by mass, and the porosity is preferably 70 to 90%. The "porosity" of the filling is calculated as follows. First, a filling having a known mass and apparent volume is immersed in water, and after it is sufficiently saturated with water, it is removed from the water and its mass is measured. From the measured mass, the volume of water that has soaked into the filling is derived. The porosity is calculated from the following formula, assuming that the volume of this water is the same as the pore volume of the filling.
Porosity (unit: %) = (volume of water) / (apparent volume of filling) x 100
The pores of the filling preferably have a size of 30 to 300 μm as measured by mercury porosimetry.
The shape of the inner fiber is not particularly limited, but may be, for example, a cylindrical shape or a rod shape. The inner fiber preferably has an insertion hole on one end surface into which the rear end of the pen tip is inserted.
The filling can be formed, for example, by molding pulp or recycled pulp material into a cylindrical shape, and the forming method can be, for example, by pressing pulp powder into a mold, impregnating it with water, and then drying it.

Until now, the batting of the present invention has mainly been made by converging synthetic resin fibers to form a porous body, but by producing it from raw materials such as waste paper, it is possible to obtain batting for writing instruments that can contribute to a recycling-oriented society by promoting environmental measures such as eliminating plastic and increasing the utilization rate of waste paper. Because recycled pulp and other materials used for the batting tend to swell in water, as described below, we have reviewed the ink composition and confirmed that stable quality can be ensured by using an oil-based ink in particular.

(Writing implements)
Figures 1 to 7 are drawings of a writing instrument A equipped with the writing instrument batting of the present invention, the writing instrument batting 10 of the present invention which is a component used in the writing instrument, component diagrams showing examples of each part (front barrel 20, rear barrel 30 which serves as the batting unit, mounting member 40 for attaching the batting, slide member 50, nib 60, cap 70), and drawings explaining the replacement mechanism for the writing instrument batting 10.
As shown in Figures 1 to 3, the writing instrument A of this embodiment is a writing instrument comprising a front barrel 20 having a nib 60, and a rear barrel 30 which serves as a padding unit in which the padding 10 of the above-described configuration is housed, and is characterized in that the padding 10 and the nib 60 can be separated by moving the rear barrel 30 straight backward.This writing instrument is structured so that the padding 10 can be removed by removing the slide member 50 provided on the rear barrel 30 from the rear barrel 30.

As described above, the batting 10 for a writing instrument is a cylindrical batting made of a porous material made of pulp such as recycled paper and/or waste paper, and has an insertion hole 11 into which the rear end side 61 of the pen tip 60 is inserted. The outer peripheral surface (outer shell) of this batting 10 has an outer shell made of paper, cellophane, and natural ingredients.
The ink for the writing instrument absorbed in the padding 10 is not particularly limited, and a suitable formulation such as water-based ink, oil-based ink, thermochromic ink, etc. can be used depending on the application of the writing instrument, etc. In the present invention, since the padding 10 is made of recycled pulp or the like and is easily swollen with water, it is preferable to absorb oil-based ink, since stable quality can be ensured by using oil-based ink as the ink composition.

As shown in Figures 4(a) to (g), the front barrel 20 is cylindrical with a tapered tip 21 at the front and has a retaining hole 22 that holds the pen tip 60, and the rear inner circumferential surface of the retaining hole 22 has multiple retaining pieces 23, 23... for holding the pen tip 60. In addition, the rear inner circumferential surface of the front barrel 20 has a fitting portion 24 for fitting the tail plug portion 31 of the rear barrel 30.

The rear barrel 30 has a unit configuration for easily replacing the batting 10 for the writing instrument, and as shown in Figures 6 (a) to (g), has an outer tube portion 31 that houses and holds the batting 10 for the writing instrument, and a tail plug portion 35 on the rear side.
The outer tube portion 31 of the rear barrel 30 is used to house and retain the writing instrument batting 10, and has divided piece portions 32, 32 with divided spaces 32a, 32a on their peripheral surfaces so as to provide elasticity inside and outside, and the writing instrument batting 10 is housed between the divided piece portions 32, 32, which have an approximately circular cross section, and a slide member 50 is attached to its outer peripheral surface. The front inner peripheral surface of the divided piece portions 32, 32 is a holding surface 33, 33 having holding piece portions 33a, 33a... that are in close contact with the outer peripheral surface of the writing instrument batting 10, and the outer peripheral surface has holding protrusions 34, 34 for holding the slide member 50.
In addition, the outer peripheral surface of the tail plug portion 35 on the rear side of the rear barrel 30 has a fitting portion 35a for fitting with the rear side of the front barrel 20, and the central portion of the inner peripheral surface has a cylindrical support portion 36 integral therewith for supporting the rear end surface 12 of the writing instrument lining 10.

As shown in Figures 7(a) to (g), the slide member 50 has a cylindrical shape, and on its rear inner peripheral surface, four slide pieces 51, 51... are provided at predetermined intervals to slide on the outer peripheral surface of the outer cylinder portion 31 consisting of the divided pieces 32, 32 of the rear axle 30, and two concave slide pieces 52, 52 are provided on its front inner peripheral surface. The front inner peripheral surface of the slide member 50 has a fitting protrusion 53 that fits along the holding protrusion 34 of the outer cylinder portion 31.

The pen tip 60 is rod-shaped, with the front side being composed of a bullet-shaped writing portion 61 and the rear portion 62 being inserted into the insertion hole 11 of the padding 10 .
Examples of the material of the pen tip 60 include porous materials having air holes, specifically sponge bodies, sintered bodies, fiber bundles, foam bodies, spongy bodies, felt bodies, porous bodies, etc. Materials for forming these porous bodies include, for example, natural fibers, animal hair fibers, polyacetal resins, polyethylene resins, acrylic resins, polyester resins, polyamide resins, polyurethane resins, polyolefin resins, polyvinyl resins, polycarbonate resins, polyether resins, polyphenylene resins, etc.
The cap 65 is detachably attached to the outer peripheral surface of the tapered portion 21 of the tip barrel 20 , and has an outer cap 66 and an inner cap 67 that surrounds the pen tip 60 .

In the writing instrument A configured as above, the padding 10 for the writing instrument can be easily replaced by the following operations.
Fig. 1 shows the writing instrument A with the batting for a writing instrument mounted thereon, and it can be used for writing if the cap 70 is removed. When oil-based ink or the like is consumed by writing and the batting 10 needs to be replaced, as shown in Fig. 2, the rear barrel 30 of the writing instrument A in Fig. 1 can be disengaged from the front barrel 20 and removed to expose the batting unit for a writing instrument. In this state, the batting 10 is elastically held by the engagement of the front side of the slide member 50, so that the batting 10 can be easily removed from the rear barrel 30 by sliding the slide member 50 rearward to release the batting 10 from the divided pieces 32, 32 as shown in Fig. 3.
When refilling with new padding 10, the padding 10 can be attached by inserting it into the rear barrel 30 from the state in which there is no padding 10 as shown in FIG. 3 and sliding the slide member 50 forward to engage it, and by installing it in this state into the front barrel 20, the replacement work is completed and the pen can be used for writing, etc.
In the writing instrument A of this embodiment, the ink reservoir for the writing instrument can be easily replaced, which contributes to a recycling-oriented society, and a writing instrument in which the ink reservoir can be reused can be provided.

8 to 15 show a writing instrument B which is another embodiment of the writing instrument A shown in Figs. 1 to 7, the writing instrument batting 10 of the present invention which is a component used in the writing instrument, parts diagrams showing examples of each part (front shaft, rear shaft, sliding member, pen tip), and drawings explaining a replacement mechanism for the writing instrument batting 10, etc. Note that descriptions of the writing instrument batting 10, the writing instrument ink absorbed in the batting 10, and the pen tip 60 which are the same components as those of the writing instrument A described above will be omitted.
As shown in Figures 8 to 15, writing instrument B of this embodiment is a writing instrument comprising a front barrel 70 having a nib 60, and a rear barrel 90 that houses the filler 10 of the above-described configuration together with a slide member 80, and is characterized in that the filler 10 and the nib 60 can be separated by moving the rear barrel 90 in a straight line backward.This writing instrument is structured so that the filler 10 can be removed by causing the rear barrel 90 to move backward, causing the filler 10 to protrude from the outer diameter of the barrel of the front barrel 70.

As shown in Figs. 12(a)-(g), the tip barrel 70 is cylindrical with a tapered tip 71 at the front, a holding hole 72 for holding the pen tip 60, and a number of holding pieces 73, 73... on the rear inner circumferential surface of the holding hole 72 for holding the pen tip 60. The rear side of the tapered part 71 has a front plate surface 74, the rear side of which is box-shaped, with its front half being a tubular part 75 and its rear half being an open box-shaped part 76. The front outer circumferential surface of the tubular part 75 has a fitting protrusion 75a. In addition, the wall parts 77, 77 on both sides of the box-shaped part 76 are formed with an inclined hole 78a that serves as an entrance for attaching and sliding the mounting pieces 96, 96 of the lifting member (pillow member) 95 that lifts the padding 10, as shown in Fig. 15, and a straight hole 78b on a straight line continuing to the inclined hole 78a.

The rear barrel 90 is cylindrical with a bottom and houses a slide member 80 which houses the filling 10 for the writing instrument. As shown in Figures 8(a) to (e), the rear barrel 90 houses the slide member 80 which houses and holds the filling 10 for the writing instrument, the cylindrical portion 75 and the box-shaped portion 76 of the front barrel 70, and is attached by fitting the front opening 91 of the rear barrel 90 into the fitting protrusion 75a of the cylindrical portion 75.
The rear end of the rear barrel 90 has a cylindrical support portion 92 formed integrally with it at the center of the inner surface thereof for supporting the rear end surface 12 of the writing implement batting 10. Also, linear slide recesses 93, 93 for accommodating and sliding the slide member 80 are provided on the upper and lower sides of the inner peripheral surface of the front opening 91, and a stop wall portion 94 for stopping the slide is provided.

As shown in Figures 14(a) to 14(g), the slide member 80 has a box-shaped outer shape, and the bottom surface 81 is curved so as to be in close contact with the cylindrical padding 10. The slide member 80 has a front plate 82 having an insertion hole 81 for the pen tip 60 at the front end, a rear plate 84 having an insertion hole 83 for inserting the support part 92 of the rear shaft 90 at the rear end, side walls 85, 85 between the front plate 82 and the rear plate 84, and the center of the side walls 85, 85 has reverse inclined holes 85a, 85a whose inclination is opposite to that of the inclined holes 78a, 78a of the front shaft 70. The upper and lower surfaces of the rear plate 84 are provided with fitting protrusions 84a, 84a which slide with the slide recesses 93, 93 of the rear shaft 90 and stop the sliding at the stop wall 94. In addition, the lower end side of the rear plate portion 84 has a contact step portion 84b so as to come into contact with the lower end of the opening of the front barrel 20. On one side of the side and bottom surface of the central portion of the sliding member 80, an operating concave portion 86 is provided, the thickness of which is the lifting member 95 that will slide.

In the writing instrument B configured as above, the padding 10 for the writing instrument can be easily replaced by the following operations.
Fig. 8 shows the writing instrument B with the writing instrument batting 10 mounted thereon, and in this state, the writing instrument B can be used for writing. When oil-based ink or the like is consumed by writing and the batting 10 needs to be replaced, the rear shaft 80 is slid rearward, and half of the batting 10 housed in the sliding member 80 comes out, as shown in Fig. 9. If the rear shaft 90 is held and slid further in this state, the sliding member 80 slides without sliding against the stopping wall 94 of the rear shaft 90, and most of the batting 10 housed in the sliding member 80 comes out, as shown in Fig. 10. In this state, the mounting pieces 96, 96 of the semicircular lifting member (pillow member) 95 arranged on the bottom surface of the padding 10 have slid to the lower ends of the inclined holes 78a, 78a of the front barrel 70 and the lower end of the reverse inclined holes 85a, 85a of the slide member 80; if the slide member 80 is slid further, as shown in FIG. 11 , the mounting pieces 96, 96 of the lifting member (pillow member) 95 are lifted to the upper ends of the inclined holes 78a, 78a of the front barrel 70 while stopping at the lower end of the reverse inclined holes 85a, 85a of the slide member 80 (by the reclining mechanism of the lifting member 95), so that the padding 10 protrudes from the outer diameter of the barrel of the front barrel 20 and half of the padding 10 is raised, and the padding 10 can be easily removed from the slide member 80.
When refilling with new padding 10, insert the padding 10 into the sliding member 80 from the state in which there is no padding 10 as shown in Figure 11 and slide the rear shaft 90 forward. The sliding member 80 will then slide forward, and the rear shaft 90 will then slide forward, completing the replacement work and allowing the pen to be used for writing, etc.
In the writing instrument B of this embodiment, the ink reservoir for the writing instrument can be easily replaced, which contributes to a recycling-oriented society, and a writing instrument in which the ink reservoir can be reused can be provided.

The padding for a writing instrument of this embodiment and the writing instrument equipped with it are not limited to the above-mentioned embodiments and can be further modified in various ways.
The writing implement of the above form has been described as a marking pen, but it may also be, for example, a color marker, a name pen, a paint marker, an alcohol disinfectant, or the like.

Next, the present invention will be described in more detail with reference to examples, but is not limited to the following examples.

Example 1
1 g of recycled pulp was filled into a cylinder of φ10 mm and L50 mm, impregnated with water, and then heated and dried for 24 hours in a thermostatic chamber at 50° C. Using the cylindrical recycled pulp filling obtained by the above operation, a felt tip pen conforming to the figures 1 to 7 was produced.
The recycled pulp material used was recycled pulp for papermaking manufactured by Chubu Denki Kogyo Co., Ltd.
The ink used was an oil-based ink having the following composition, with ethanol as the main solvent.
The pulp density was 20 wt % and the porosity was 80%.
The average pore size was about 80 μm.
(Writing ink composition: Ink color: Black)
As the ink for the writing instrument, an ink having the following composition (total 100% by mass) was used.
Ethyl alcohol 70% by weight
Normal propyl alcohol 5% by mass
Benzyl alcohol 3% by weight
Tamanor 531 (manufactured by Arakawa Chemical Industries, Ltd.) 7% by mass
Carbon black MA-8 [manufactured by Mitsubishi Chemical Industries, Ltd.] 13% by mass
Polyether modified silicone oil [KP-369, manufactured by Shin-Etsu Chemical Co., Ltd.] 2% by mass
(Configuration of pen tip 60)
Pen tip 60: Sintered polyethylene core, porosity: 60%, bullet-shaped, maximum diameter 4 mm, length 35 mm
When the felt tip pen having the above-described structure was used to write, good writing was achieved, and when the padding was replaced using the mechanism of the writing implement A described above, the padding could be easily removed.

The writing implement batting can be suitably used as batting for writing implements such as felt-tip pens, underline pens, and oil-based markers. In a writing implement using this writing implement batting, the batting and the pen core can be separated by moving the rear shaft straight backward, resulting in a writing implement that allows for easy replacement of the batting.

10 Filling 20 Front barrel 30 Rear barrel 50 Slide member 60 Pen tip 70 Cap

Claims (4)

A padding material for writing instruments that is made from a porous material made from pulp. A writing instrument comprising a front barrel having a pen tip and a rear barrel containing the batting described in claim 1, characterized in that the batting and the pen tip are separated by moving the rear barrel straight backward. The writing instrument according to claim 2, wherein the padding can be removed by releasing a sliding member provided on the rear shaft. The writing instrument according to claim 2, wherein the writing instrument has a structure in which the inner lining protrudes from the outer diameter of the barrel of the front barrel when the rear barrel moves rearward.

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