Ink occlusion body, evaporation core, and method of manufacturing ink occlusion body

Abstract

An ink occlusion body that allows ink to move smoothly and improves writing distance and ink consumption, and a method for manufacturing the ink occlusion body are provided. [Solution] In the ink occlusion body 10, fiber bundles are processed so that sparse portions 202 and dense portions 204 are alternately and regularly connected, and then converged to achieve an optimal crimp rate and porosity, resulting in a continuous alternation of capillary strength in the longitudinal direction of the fibers and a macroscopically regular arrangement in the direction perpendicular to the longitudinal direction. As a result, ink is pulled from the sparse portions 202 toward the dense portions 204, reducing the ink density in the sparse portions 202. However, since the dense portions 204 of the fiber bundles are interleaved in the areas surrounding the sparse and dense portions 202, a large amount of ink is present, and ink flows into the sparse portions 202 due to the action of cohesive force. This cycle is repeated, maintaining a smooth balance between ink movement and retention due to capillary force and cohesive force, improving writing performance.

Description

[Technical Field]

[0001] The present invention relates to an ink occlusion body, a vaporization wick, and a method for manufacturing an ink occlusion body. [Background technology]

[0002] Patent Document 1 describes a core of a felt-tip writing pen. The core of this felt writing pen is a core for a marking pen that uses crimped fibers as an ink absorbent, and is characterized in that the central portion is made of fibers with a single filament fineness of 1.5 to 4 denier, and the peripheral portion is made of fibers with a single filament fineness 1.5 to 3 times thicker than the central portion's fibers, and the central portion's occupied cross-sectional area is not smaller than the cross-sectional area of ​​the toe cap base.

[0003] Patent Document 2 describes a writing implement such as a marking pen, particularly a writing implement that can use liquid pigment ink with a relatively high viscosity. This writing instrument is characterized by having a casing with a plurality of axially tapered ribs on the inner cylindrical surface, into which a filler with a substantially uniform basis weight and cross-sectional area is pressed in the axial direction, with the density of the filler made dense on one side of the axial direction and coarse on the other, with the pen tip connected to the denser side of the filler and allowing the filler to absorb and retain liquid pigment ink.

[0004] Patent document 3 describes a writing instrument that supplies writing instrument ink, such as water-based ink or oil-based ink, impregnated in an ink absorbing body inside the barrel to the pen tip, which is the writing part, and improves the consumption rate of the ink impregnated in the ink absorbing body. This writing instrument supplies ink impregnated in an ink reservoir inside the barrel to the pen tip, which is the writing part, and is characterized in that the ink impregnated in the ink reservoir is supplied to the pen tip through a relay core that is in contact with the inside of the ink reservoir up to a length of at least 10% of the total length of the ink reservoir.

[0005] Patent Document 4 describes a fibrous molded article that has a large liquid transport capacity and a high liquid absorption rate. The fiber molding is a rod-shaped product obtained by heat-molding a nonwoven fabric containing heat-fusible fibers, and has a cross-sectional area of ​​0.005 to 0.5 mm in a cross section perpendicular to the axial direction of the fiber molding. 2 Large gaps within the range of 0.005 mm 2 The total cross-sectional area of ​​the large gaps is within the range of 3 to 30% of the cross-sectional area of ​​the fiber molding perpendicular to the axial direction, and the cross-sectional area of ​​the fiber molding perpendicular to the axial direction is 50 mm 2 It is characterized by the presence of 15 to 500 large gaps.

[0006] Patent Document 5 describes a liquid-retaining batting that has an excellent balance between the retention and flow of ink for writing implements and is less likely to leak when subjected to shock such as being dropped. This liquid-retaining filling is composed of two or more types of fibers, including a first fiber having a crimp rate of 0% or more and 25% or less, and a second fiber having a crimp rate greater than that of the first fiber, and is characterized in that the difference between the crimp rate of the second fiber and the crimp rate of the first fiber is 5 to 25%. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 53-104318 [Patent Document 2] Japanese Patent Application Laid-Open No. 2000-043471 [Patent Document 3] Japanese Patent Application Laid-Open No. 2004-066479 [Patent Document 4] Japanese Patent Application Laid-Open No. 2011-063914 [Patent Document 5] Japanese Patent Application Publication No. 2019-055558 Summary of the Invention [Problem to be solved by the invention]

[0008] Some conventional ink holders adjust the ink retention and flow rate by adjusting the fiber density, but this can hinder ink consumption efficiency and writing distance improvement due to an imbalance between the ink's cohesive force and capillary force, or between the capillary force and adhesive force. Furthermore, conventional ink holders have portions with uneven fiber density that are not properly arranged, making them vulnerable to impacts and sometimes causing ink leakage.

[0009] An object of the present invention is to provide an ink occlusion body that allows smooth ink movement and improves writing distance and ink consumption, and a method for manufacturing the ink occlusion body. Another object of the present invention is to provide an evaporation wick that can smoothly move liquid and improve the amount of liquid consumed. [Means for solving the problem]

[0010] The invention described in claim 1 is an ink absorbing body having a filling composed at least of a plurality of fiber bundles in which sparse sections having a fiber density within a predetermined range and dense sections having a fiber density higher than the sparse sections are alternately formed in the longitudinal direction.

[0011] In a second aspect of the present invention, in the ink occlusion body of the first aspect, the sparse portion and the dense portion are arranged side by side in a direction perpendicular to the longitudinal direction.

[0012] According to a third aspect of the present invention, in the ink occlusion body according to the second aspect, the ink occlusion body further comprises a cylindrical member that holds the inner cotton inside.

[0013] A fourth aspect of the present invention provides the ink occlusion body according to the third aspect, wherein the material of the fiber bundle is an interlaced yarn.

[0014] A fifth aspect of the present invention is the ink occlusion body according to the fourth aspect, wherein the sparse portions are formed at 10 to 25 locations per 100 mm of length in the longitudinal direction.

[0015] The invention described in claim 6 is an evaporation core composed at least of a plurality of fiber bundles in which sparse sections having a fiber density within a predetermined range and dense sections having a fiber density higher than that of the sparse sections are alternately formed in the longitudinal direction.

[0016] The invention described in claim 7 is a method for manufacturing an ink absorbing body having a filling composed at least of a plurality of fiber bundles in which sparse sections having a fiber density within a predetermined range and dense sections having a higher fiber density than the sparse sections are alternately formed in the longitudinal direction, the method including a first step of opening an interlaced yarn, a second step of crimping the interlaced yarn processed by the first step, and a third step of opening the interlaced yarn processed by the second step.

[0017] The invention described in claim 8 is a method for manufacturing an ink absorbing body comprising a fill composed at least of a plurality of fiber bundles in which sparse sections having a fiber density within a predetermined range and dense sections having a higher fiber density than the sparse sections are alternately formed in the longitudinal direction, and a tubular member that holds the fill inside, the method including: a first step of spreading interlaced yarn; a second step of crimping the interlaced yarn processed in the first step; a third step of spreading the interlaced yarn processed in the second step; a fourth step of bundling multiple interlaced yarns processed in the third step to form the fill and forming the tubular member to cover the outer circumference of the fill; and a fifth step of cutting the tubular member formed in the fourth step together with the fill to a predetermined length. [Effects of the Invention]

[0018] According to the present invention, it is possible to provide an ink occlusion body that allows smooth ink movement and improves writing distance and ink consumption, and a method for manufacturing the ink occlusion body. Furthermore, according to the present invention, it is possible to provide an evaporation wick that can smoothly move liquid and improve the amount of liquid consumed. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a side view of an ink occlusion body according to an embodiment of the present invention; [Figure 2] These are explanatory diagrams showing the filling of the ink absorbing body, where (A) is a cross section taken along the ZZ cross section line shown in Figure 1, (B) is a cross section taken along the X1-X1 cross section line shown in (A), and (C) is a cross section taken along the X2-X2 cross section line shown in (A). [Figure 3] This is a flow diagram showing the manufacturing method of the ink occlusion body, where (A) is a photograph of the interlaced yarn before processing, (B) is a photograph of the pre-treated interlaced yarn, and (C) is a photograph of the interlaced yarn after crimping. [Figure 4] Photographs showing the appearance of interlaced yarn after crimping, (B) being a photograph of the appearance processed to have a higher crimp rate than (A). [Figure 5] 1 shows the measurement results of ink consumption per 50 m in Test Example 1. [Figure 6] The total ink consumption amount and ink consumption rate obtained from the measurement results in Figure 5. [Figure 7] This is the difference in ink consumption per 50 m obtained from the measurement results in Figure 5. [Figure 8] 10 shows the measurement results of ink wicking time in Test Example 2. [Figure 9] 10 shows the measurement results of the amount of ink absorbed in Test Example 3. DETAILED DESCRIPTION OF THE INVENTION

[0020] Next, embodiments of the present invention will be described with reference to the accompanying drawings to facilitate understanding of the present invention. Note that in the drawings, parts that are not relevant to the description may be omitted.

[0021] As shown in FIG. 1, an ink occlusion body 10 for a writing instrument according to one embodiment of the present invention comprises a padding 20 and a tubular member 30, and allows ink to move smoothly, thereby improving ink consumption.

[0022] As shown in Figure 2(A), the filling 20 is composed of at least a plurality of crimped yarns (examples of fiber bundles) 201a, 201b, 201c, 201d, etc., each of which is made by crimping interlaced yarns, and each of the crimped yarns 201a, 201b, 201c, 201d, etc. has sparse sections 202 with low fiber density and dense sections 204 with higher fiber density than the sparse sections 202 alternately formed in the longitudinal direction. The sparse portions 202 are more bulging in the radial direction of the ink occluding body 10 than the dense portions 204, and have a fiber density within a predetermined range. The sparse portions 202 are preferably formed at 10 to 25 locations per 100 mm of length in the longitudinal direction.

[0023] 2(B) and 2(C), each crimp-textured yarn 201a, 201b, 201c, 201d, etc. is arranged so that the sparse portions 202 and the dense portions 204 are adjacent to each other in a direction perpendicular to the longitudinal direction. In other words, the sparse portions 202 and the dense portions 204 are arranged according to a predetermined rule so that the sparse portions 202 are not adjacent to each other.

[0024] Furthermore, since the padding 20 is a liquid supply means that can smoothly move the liquid contained inside, it is clear that it can also be used as an evaporation wick that mainly sucks up liquid medicines and the like from the bottom and vaporizes or evaporates them.

[0025] The cylindrical member 30 is a hollow member made of resin, and holds the padding 20 inside.

[0026] In this ink occlusion body 10, the sparse portion 202 and the dense portion 204 are formed in the longitudinal direction of the padding 20, thereby effectively controlling the capillary force and cohesive force, and optimizing the balance between ink fluidity and retention. Ink is drawn from the sparse portion 202 to the dense portion 204 by capillary force, and cohesive force acts from the dense portion 204 to the sparse portion 202, allowing the ink to move smoothly and be supplied toward the pen tip. This makes it possible to suppress ink smearing and dripping while achieving a higher ink consumption rate than before. When the sparse portions 202 and the dense portions 204 are arranged adjacent to each other in the radial direction, this effect is more pronounced than when they are not arranged adjacent to each other.

[0027] Next, a method for manufacturing the ink occlusion body 10 will be described. 3, the method for manufacturing the ink occlusion body 10 includes a first step P1, a second step P2, a third step P3, a fourth step P4, and a fifth step P5. However, if possible, the steps may be performed in a different order or in parallel.

[0028] (First process P1) This step is a pretreatment step in which the fibers that make up the interlaced yarn shown in FIG. 3(A) are loosened and opened. Specifically, for example, a tension of 1 to 2 g / single yarn is applied to perform edging, and then a tension of, for example, 0.5 kg / cm is applied parallel to the longitudinal direction of the fiber bundle. 2 Apply tension to open the fibers. However, the method for opening the fibers is not limited and may be any method. As shown in FIG. 3(B), the opened interlaced yarn has clearly defined sparse portions 202 and dense portions 204.

[0029] (Second process P2) This step is a crimping step in which the interlaced yarn treated in the first step P1 is crimped by heating to a predetermined crimp rate.

[0030] Here, the crimp rate is the weight ratio before and after crimping, expressed as a percentage. The weight ratio can be converted to a predetermined arbitrary length (e.g., 9,000 m) as needed.

[0031] The interlaced yarn that has been crimped through this process has increased bulk, as shown in Figure 3(C), compared to the interlaced yarn shown in Figure 3(B). For reference, the appearance of interlaced yarns processed to different crimp rates is shown in Figures 4(A) and 4(B).

[0032] (Third process P3) This step is a post-processing step in which the interlaced yarn processed in the second step P2 is opened to produce crimp textured yarns 201a, 201b, 201c, 201d, . . . The method for opening the fibers is not limited and may be any method.

[0033] (Fourth step P4) This step is a step in which a plurality of crimped yarns 201a, 201b, 201c, 201d, etc. produced in the third step P3 are bundled together to form a fiber bundle, and a tubular member 30 is formed so as to cover the outer periphery of this fiber bundle. By this process, a long ink occlusion body (not shown) before cutting is manufactured.

[0034] (Fifth step P5) This step is a step of cutting the ink occlusion body (not shown) before cutting, which has been manufactured in the fourth step P4, to a predetermined length. By this process, the ink occlusion body 10 is manufactured. The manufactured ink occlusion body 10 is incorporated into the interior of a writing implement. [Example]

[0035] Next, test examples will be shown to further explain the ink occlusion body 10. (Test Example 1) The inventors produced ink occlusion bodies according to Examples 1 to 4 and ink occlusion bodies according to Comparative Examples 1 to 4, which have different materials for the padding 20, according to the above-mentioned production method, and measured the ink consumption of each.

[0036] The material of the padding 20 of the ink occluding body 10 in Example 1 is a 4 denier interlaced yarn that has not been subjected to the above-mentioned crimping process (second process P2). The ink occluding bodies 10 in Examples 2 to 4 use a 4 denier interlaced yarn as the material of the padding 20, and the crimp rates in the above-mentioned crimping process (second process P2) are 10%, 15%, and 25%, respectively. The ink occlusion bodies of Comparative Examples 1 to 4 use non-interlaced 4-denier textured yarn as the filling material. Of these, Comparative Example 1 is not crimped, and Comparative Examples 2 to 4 have crimp rates of 10%, 15%, and 25%, respectively. The diameter of each ink occlusion body is 7.5 mm, the length is 77 mm, and the void volume is 2.72 cm. 2 and other conditions are the same.

[0037] A writing implement equipped with each ink occlusion body was prepared, and the amount of ink consumed every 50m was measured using a writing machine. Five identical ink occlusion bodies were prepared for each purpose, and the measured value was the average of these. The writing machine is a device for evaluating writing performance by moving a writing implement at a constant speed and pressure.

[0038] Figure 5 shows the measurement results of ink consumption [g] for each ink occlusion body every 50 m. It is assumed that smearing occurs when the ink consumption per 50 m becomes 0.100 g or less, and in FIG. 5, the measured value when smearing occurs is indicated by shading. FIG. 6 shows the total ink consumption amount [g] and ink consumption rate [%] obtained from the measurement results in FIG. Furthermore, FIG. 7 shows the difference in ink consumption [g] per 50 m obtained from the measurement results of FIG.

[0039] As a result of the measurements, as can be seen from Figure 5, for Examples 3 and 4, the ink consumption up to a total writing distance of 250 m was about 0.01 g to 0.04 g / 50 m more than the corresponding Comparative Examples 3 and 4, and the difference in ink consumption per 50 m was also small, as can be seen from Figure 7. Furthermore, the smaller the difference in ink consumption per 50 m, the more stable the ink supply to the pen tip. Therefore, it can be said that the liquid moves continuously and smoothly in one direction within the fiber bundle, from the sparse portion 202 to the dense portion 204 and from the dense portion 204 to the sparse portion 202.

[0040] 5 and 6, the ink consumption rates of Examples 3 and 4 were very high, and the writing performance was excellent. In particular, considering the difference in ink consumption per 50 m shown in Figure 7, it can be said that stable and smooth ink movement was achieved even as the ink filling volume decreased due to consumption.

[0041] (Test Example 2) The inventors produced ink occlusion bodies according to Examples 2-2, 3-2, and 4-2 and ink occlusion bodies according to Comparative Examples 2-2, 3-2, and 4-2, and measured the ink absorbing time for each.

[0042] The ink absorbing materials 10 of Examples 2-2, 3-2, and 4-2, like the example of Test Example 1, use 4 denier interlaced yarn as the filling material 20, and the crimp ratios in the aforementioned crimping process (second process P2) are 10%, 15%, and 25%, respectively. The ink absorbing materials of Comparative Examples 2-2, 3-2, and 4-2, like the comparative example of Test Example 1, use 4 denier processed yarn that has not been interlaced as the filling material, and have crimp rates of 10%, 15%, and 25%, respectively. However, unlike the examples and comparative examples of Test Example 1, the diameter of each ink occlusion body produced was 7.5 mm and the length was 100 mm.

[0043] Ink was stored in the tank to a depth of 10 mm, and each ink occluder was held vertically to measure the ink wicking time. The ink wicking time was the time from when the bottom end of the ink occluder contacted the ink until the ink reached the top of the ink occluder, and was measured with a stopwatch. Five identical ink occluders (samples No. 1 to 5) were prepared for each example and comparative example, and the average data for these was used as the final ink wicking time.

[0044] Figure 8 shows the measurement results of the ink absorption time for each ink occlusion body. No significant changes were observed in Comparative Examples 2-2, 3-2, and 4-2, but in Examples 3-2 and 4-2, by applying the opening and crimping processes, interference between the fibers occurred within the fiber bundle, forming appropriate sparse and dense fiber portions, resulting in favorable changes. The reason why good results were not obtained in Example 2-2 is that appropriate sparse and dense groups were not formed between the fiber bundles.

[0045] (Test Example 3) The inventors produced ink occlusion bodies according to Examples 2-3, 3-3, and 4-3 and ink occlusion bodies according to Comparative Examples 2-3, 3-3, and 4-3, and measured the amount of ink absorbed by each.

[0046] The ink absorbing materials 10 of Examples 2-3, 3-3, and 4-3, like those of Test Examples 1 and 2, use 4 denier interlaced yarn as the filling material 20, and the crimp ratios in the aforementioned crimping process (second process P2) are 10%, 15%, and 25%, respectively. The ink absorbing materials of Comparative Examples 2-3, 3-3, and 4-3, like the comparative examples of Test Examples 1 and 2, use 4 denier processed yarn that has not been interlaced as the filling material, and have crimp rates of 10%, 15%, and 25%, respectively. However, unlike the examples and comparative examples of Test Examples 1 and 2, the diameter of each ink occlusion body produced was 7.5 mm and the length was 250 mm.

[0047] Each ink occlusion body was soaked in ink, and the maximum amount of ink absorbed (amount of ink absorbed) in one hour was measured. For each example and comparative example, 10 identical ink occlusion bodies were prepared, and the average data for these was used as the final amount of ink absorbed.

[0048] Figure 9 shows the measurement results of the amount of ink absorbed by each ink occlusion body. Note that in Figure 9, the void volume is the volume of the space within the internal volume of the filling, and since the difference in weight of the filling was 0.01 g, it was calculated as a fixed amount. The absorption rate is the maximum amount absorbed divided by the void volume.

[0049] In Comparative Examples 3-3 and 4-3, the amount of wicking hardly changed, but in the Examples, as the crimp rate increased, good liquid transfer (ink diffusibility) was achieved, and good liquid transfer was achieved.

[0050] Next, the inventor's considerations based on the results of each test example will be explained. However, the technical matters explained so far should not be construed as being limited to these considerations. The present disclosure relates to an ink holder and a liquid evaporation wick for a writing instrument that have improved performance by skillfully combining capillary force and liquid cohesive force through a special fiber structure. Liquid has the property of moving from sparse areas, where the fiber density is low, to dense areas, where the fiber density is high, due to capillary force. The fiber bundle used in this disclosure is characterized by a structure in which these sparse and dense areas are intentionally and regularly arranged. Within this structure, liquid first moves from sparse areas to dense areas. As a result, the liquid in the sparse areas decreases, and then the "cohesive force" that attracts the liquid to each other comes into play, attracting liquid from the surrounding dense areas and maintaining the amount of liquid in the sparse areas. In this way, continuous and smooth movement of liquid is achieved between sparse and dense areas.

[0051] In order to improve the efficiency of ink consumption in a conventional ink holder for a writing instrument, it is necessary to lightly hold the ink (to weaken the holding power). However, simply weakening the holding power posed problems such as ink leaking from the nib (a phenomenon known as "dripping") and a shorter writing distance, which significantly compromised the quality of the pen as a writing instrument. To solve this problem, the present disclosure recommends using a fiber bundle of, for example, 36 to 1200 td, which is processed to have a coarse and fine texture, optimizing the overall void ratio (porosity) to, for example, 70 to 95% to match the viscosity of the ink. In this structure, the coarse and dense portions are regularly and three-dimensionally arranged in both the vertical and horizontal directions of the fibers. This allows the dense portions to firmly hold the ink and prevent dripping, while the combined action of the entire coarse and dense structure ensures smooth ink delivery to the pen tip, achieving both optimal ink retention and a comfortable writing experience.

[0052] On the other hand, in the case of evaporative wicks used in air fresheners, the liquid is always pulled downward by gravity, so a strong capillary force is required to overcome the weight of the liquid and draw it up to the top. When the structure of the present disclosure is applied to a vaporization wick, the porosity is set to 50-95%, and the dense and sparse structures are regularly arranged at close distances. This three-dimensional structure, created by processing the fibers to crimp and spread, reduces the effect of the weight of the liquid and creates a force that smoothly absorbs the liquid to a higher position. As a result, vaporization performance is greatly improved.

[0053] In the padding 20 of the present disclosure, the sparse portion 202 and the dense portion 204 each play a unique role. In the sparse portion 202, ink moves toward the pen tip due to capillary forces toward the dense portion 204. At the same time, the forces (adhesiveness and cohesive force) of the ink in the dense portion 204 moderately control the flow of ink from the sparse portion 202, also serving as a regulator to prevent excessive ink flow. Furthermore, the ink in the dense portion 204 is attracted by the cohesive force and surface tension of the ink in the sparse portion 202, helping to ensure a stable supply to the pen tip.

[0054] This type of coarse-dense structure is produced by subjecting the fiber bundle to opening and crimping processes, and the optimal coarse-dense balance is achieved by applying a particularly strong crimping process, such as 10 to 25 fibers per 100 mm. The dense portion 204 is formed by entangling the fibers by applying heat or blowing high-pressure air. For example, even if it is difficult to process the fibers by crimping them with hot air, loosening the fibers with a light process beforehand makes subsequent full-scale processing easier and allows the desired coarse-dense structure to be produced.

[0055] As described above, with the ink occlusion body 10 according to this embodiment, ink can move more smoothly, thereby improving ink consumption compared to a case where the ink occlusion body 10 is not configured as described above.

[0056] Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions that do not depart from the gist of the present invention are within the scope of application of the present invention. The aforementioned padding 20 is not limited to those used as writing implements or transpiration cores. [Explanation of symbols]

[0057] 10 Ink occlusion body 20 padding 30 Cylindrical member 201a, 201b, 201c, 201d Crimped yarn 202 Sparse area 204 Secret area P1 First process P2 Second process P3 Third process P4 Fourth process P5 5th step

Claims

1. a sparse portion having a fiber density within a predetermined range; The ink occlusion body has a dense portion having a higher fiber density than the sparse portion, and a filling composed of at least a plurality of fiber bundles formed alternately in the longitudinal direction.

2. 2. The ink occlusion body according to claim 1, wherein the sparse portion and the dense portion are arranged side by side in a direction perpendicular to the longitudinal direction.

3. 3. The ink occlusion body according to claim 2, The ink occlusion body further comprises a cylindrical member that holds the padding therein.

4. 4. The ink occlusion body according to claim 3, The ink occlusion body wherein the material of the fiber bundle is interlaced yarn.

5. 5. The ink occlusion body according to claim 4, The ink occlusion body has 10 to 25 sparse portions formed per 100 mm of length in the longitudinal direction.

6. a sparse portion having a fiber density within a predetermined range; The evaporation core is composed of at least a plurality of fiber bundles, each of which has a dense portion having a higher fiber density than the sparse portion and is formed alternately in the longitudinal direction.

7. A method for manufacturing an ink occlusion body having a filling composed at least of a plurality of fiber bundles in which sparse portions having a fiber density within a predetermined range and dense portions having a fiber density higher than that of the sparse portions are alternately formed in a longitudinal direction, the method comprising: A first step of opening interlaced yarns; a second step of crimping the interlaced yarn treated by the first step; a third step of opening the interlaced yarns processed in the second step.

8. A method for manufacturing an ink occlusion body comprising: a batting made of at least a plurality of fiber bundles in which sparse portions having a fiber density within a predetermined range and dense portions having a fiber density higher than the sparse portions are alternately formed in a longitudinal direction; and a cylindrical member that holds the batting therein, A first step of opening interlaced yarns; a second step of crimping the interlaced yarn treated by the first step; A third step of opening the interlaced yarn processed in the second step; a fourth step of bundling a plurality of interlaced yarns processed in the third step to form the batting, and forming the tubular member so as to cover the outer periphery of the batting; a fifth step of cutting the cylindrical member formed in the fourth step together with the inner batting to a predetermined length.

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