Porous material pen nibs and writing instruments

Abstract

The present invention discloses a pen nib and writing instrument made of a porous material. The pen nib of the present invention has a head portion and The head and handle are made entirely of porous material, including the handle connected thereto. The head part refers to the part closest to the writing end, and the handle part is connected to the barrel and also This refers to the part that draws in the ink. This invention enables fluent writing and a continuous supply of ink. Furthermore, it has the advantage of producing even color development and excellent durability.

Description

Technical Field

[0001] The present invention relates to the field of pen core materials enabling smooth writing, particularly to pen cores made of porous materials and writing instruments.

Background Art

[0002] The pen tips of writing instruments such as paint markers and underlining markers are provided with relatively wide pen cores to enable wide line drawing, and are widely used because they are excellent in the visibility of marking and workability. The pen tips in writing instruments such as line markers generally impart capillary action to a porous member, and thereby enable writing by导出 the ink supplied from the shaft body serving as the writing instrument body to the pen tip. The porous member is a material obtained by aggregating synthetic resin fibers or the like in a rod shape, or a sintered body of a polymer. The porous plastic structure including the writing pen tip is usually manufactured by sintering particles of a thermoplastic material together.

[0003] In the prior art such as Publication No. CN112888576B, a writing instrument is described. The pen tip of this writing instrument is a pen tip provided with a pen core containing a masking material, and the lightness of the pen core in the L*a*b* (CIE LAB) color system is 80 or more. Examples of such writing instruments include , for example, a holder having a visible portion where the writing direction can be visually recognized, and the above-described structure of the pen tip attached to the holder. As another example, US20220041006A1 discloses a pen tip and a related writing instrument. The pen tip has a pen tip shell, and the pen tip shell includes a flexible upper writing portion and a lower portion connected to the flexible upper writing portion. ​The lower part of the nib shell is configured to supply ink to the flexible upper writing section. The flexible upper writing section is configured to supply ink to the writing surface. The flexible upper writing section includes a flat, chisel-shaped tip at the upper end of the flexible upper writing section. The nib is Applying a force of less than approximately 0.1 lbs allows for effective ink delivery to the writing surface.

[0004] Publication number JP7420905B2 also describes a writing instrument with a porosity of 30-70% for the pen tip. It is shown that the ink composition for writing instruments contains colored resin particles with an average particle size of 1 to 10 μm. It possesses the particle size distribution (Mv / Mn) of colored resin particles with an ink viscosity of 8-20 mPa·s·A. The values ​​are 1-3. Publication number US3942903A is for an integrated porous thermoplastic writing nib. This is disclosed, which enables porous thermoplastic products having a uniform pore size, and improved A writing nib is provided. The above prior arts are all single-material technologies. [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] The objective of this invention is to provide a writing device that allows for fluent writing and provides a continuous supply of ink, compared to the prior art. The objective is to provide a pen tip made of a porous material that exhibits even color development and excellent durability. [Means for solving the problem]

[0006] The technical solutions employed by the present invention to solve the above technical problems are as follows: It is a pen tip made of porous material, consisting of a head part and a handle part connected thereto. The head and handle are both made of porous material. The head is made of porous material on the side closer to the writing end. The term "handle" refers to the part that is connected to the shaft and is the part that draws in ink. The names indicate the relative position of the pen tip and are for convenience to improve understanding and readability. Therefore, the head and handle cannot be considered as two separate components.

[0007] The following are further measures to be taken to optimize the above technical solutions: The porous members of the head and handle have different average pore sizes. Preferably, the porous member of the head portion has a first average pore diameter, and the porous member of the handle portion has a second average pore diameter. It has an average pore diameter, and the first average pore diameter is less than or equal to the second average pore diameter. Preferably, the ratio of the first mean pore size to the second mean pore size is 1:5 to 1:50. Preferably, the ratio of the first mean pore size to the second mean pore size is 1:1 to 1:4.999.

[0008] Preferably, the average pore size of the porous material in the head portion is 1 μm to 300 μm, and the stalk portion is multi-layered. The average pore size of the porous material is 5 μm to 300 μm. Pen tips made of porous materials with different properties are The pen tip is made from porous polymer particles sintered by a sintering process. It is formed by heat sintering. The nib provides a comfortable writing experience and excellent performance. It provides a writing effect. In a typical pen nib, the material properties of the handle and head parts, for example, Pore ​​diameter, porosity, flow velocity, and capillary force are the same. In the embodiment of the present invention, one pe The core uses two or more materials with different properties, such as small hole diameter and large hole diameter, for example, the handle The pore diameter of the section is larger than the pore diameter of the head section. The porous material of the head section and the handle section has different flat surfaces. It has a uniform particle size.

[0009] Preferably, the porous member of the head portion has a first average particle diameter, and the porous member of the stem portion has a second average particle diameter, and the first average particle diameter is less than or equal to the second average particle diameter, Preferably, the ratio of the first average particle diameter to the second average particle diameter is 1:2 to 1:60, Preferably, the ratio of the first average particle diameter to the second average particle diameter is 1:1 to 1:1.999.

[0010] Preferably, the average particle diameter of the porous member of the head portion is 3 μm to 900 μm, and that of the porous member of the stem portion is 6 μm to 990 μm, Preferably, the particles of the head portion and the particles of the stem portion have different particle size distributions. For the stem portion of the pen core, a fast flow rate and a low capillary force are required, so that the liquid can be sucked from the reservoir to the head portion of the pen core. The head portion of the pen core is designed such that the flow rate of the liquid is slow but the capillary force is high. The purpose of such a design is to suck the liquid from the stem portion of the pen core, flow it smoothly onto the writing surface, and provide a comfortable writing experience and an excellent writing experience. With such a design of the pen core, the liquid moves from the reservoir to the stem portion by capillary force, passes through the stem portion to reach the head portion, and contacts the writing surface through the end of the head portion. The porous members of the head portion and the stem portion have different porosities.

[0011] Preferably, the porous member of the head portion has a first porosity, and the porous member of the stem portion has a second porosity, and the first porosity is less than or equal to the second porosity, Preferably, the ratio of the first porosity to the second porosity is 1:1.1 to 1:40, Preferably, the ratio of the first porosity to the second porosity is 1:1 to 1:1.109. ​Preferably, the porosity of the porous material in the head portion is 2.5% to 90%, and the porosity of the handle portion is... The porosity of the material is 5% to 78%. Preferably, the head portion and the handle portion have different rigidities. Preferably, the head and handle parts are of different colors. Preferably, the porous members of the head and handle have different capillary forces, and the hair of the head The capillary force in the head is greater than the capillary force in the handle. The flow velocity in the head is slower than the flow velocity in the handle. The wick's stem requires a fast flow rate and low capillary force, which allows the liquid to flow from the reservoir. The liquid can be drawn into the head of the pen nib. The head of the pen nib has a low liquid flow rate. It is designed to have high capillary action. The purpose of this design is to allow liquid to escape from the handle of the pen tip. It draws in the ink, allowing it to flow smoothly onto the writing surface for a comfortable writing experience and superior writing performance. The goal is to provide an experience. This pen tip design allows for capillary action. The liquid moves from the reservoir to the handle, through the handle to the head, and then to the head. Bring it into contact with the writing surface.

[0012] The pen tip made of porous material is composed of porous members. The porous members are bonded together by at least one joint It has a surface, Preferably, both sides of the joining surface have different porosity levels. Preferably, both sides of the bonding surface have different average particle diameters. Preferably, both sides of the joint surface have different average pore diameters and / or capillary forces. Preferably, among the n segments of the pen tip body, the i-th segment closest to the head portion is It has a different porosity compared to the j-th segment near the stem, and / or Having different average particle diameters, and / or, Having different average pore sizes, and / or, They have different capillary forces, where n is a natural number less than 100, and i <n、かつj<n The specific measurement method is exemplified below: The pen tip is moved in the direction of ink flow. Divide it into n equal segments along the line, for example, n=5. Of these, the first segment The section includes the writing surface contact end of the pen tip head, and thus the fifth section is The end of the handle is included. According to this definition, the second segment (i.e., i=2) and the fourth segment Measure and compare the average pore sizes of two components (i.e., j=4) to see if they are the same. Determine if they are different.

[0013] The pen tip uses a sintered porous material containing plastic powder. Olefin, polyamide, polyester, rigid polyurethane, polyacrylonitrile, Recarbonate, polyvinyl chloride, polymethyl methacrylate, polyvinylidene fluoride, Polytetrafluoroethylene, polyethersulfone, polystyrene, polyetherim D, polyether ether ketones or polysulfones, and combinations thereof and / or copolymers thereof.

[0014] Preferably, at least a portion of the writing end near the porous body is in the same ink as the porous body. The porosity is lower than that of the suction end. Preferably, at least a portion of the writing end near the porous body is in the same ink as the porous body. The average particle size is smaller than that of the suction end. Preferably, at least a portion of the writing end near the porous body is in the same ink as the porous body. The average pore diameter is smaller than that of the suction end. Preferably, the head portion is composed of plastic powder and porous material. The material powder used for the handle portion has different particle size distributions. The particle size distribution is expressed as Mv / Mn.

[0015] The present invention further discloses a writing instrument manufactured with the above-described porous material pen nib.

[0016] In this invention, the head and handle are both made of porous material. The head is made of a writing material. The part closest to the end refers to the handle, which is connected to the shaft and is the part that draws in ink. Therefore, the present invention enables fluent writing, provides a continuous supply of ink, and the color is consistent. It has the advantage of producing vibrant colors and being highly durable. [Brief explanation of the drawing]

[0017] [Figure 1] This is a schematic diagram of the front structure of the pen tip according to Embodiment 1 of the present invention. [Figure 2] This is a schematic diagram of the cross-sectional structure of the pen tip according to Embodiment 1 of the present invention. [Figure 3] This is a schematic diagram of the cross-sectional structure of the pen tip according to Embodiment 2 of the present invention. [Figure 4] This is a schematic diagram of the cross-sectional structure of the pen tip according to Embodiment 3 of the present invention. [Figure 5] This is a schematic diagram of the front structure of the pen tip according to Embodiment 4 of the present invention. [Figure 6] This is a schematic diagram of the cross-sectional structure of the pen tip according to Embodiment 4 of the present invention. [Figure 7] This is a schematic diagram of the cross-sectional structure of the pen tip according to Embodiment 5 of the present invention. [Figure 8] This is a schematic diagram of the cross-sectional structure of the pen tip according to Embodiment 6 of the present invention. [Figure 9] This is an enlarged schematic diagram of a partial structure of Embodiment 6 of the present invention. [Figure 10] This is a schematic diagram of the front structure of the pen nib according to Embodiment 7 of the present invention. [Figure 11] This is a schematic diagram of the cross-sectional structure of the pen tip according to Embodiment 7 of the present invention. [Figure 12] This is a schematic diagram of the cross-sectional structure of the pen tip according to Embodiment 8 of the present invention. [Figure 13] This is a schematic diagram of the cross-sectional structure of the pen tip according to Embodiment 9 of the present invention. [Figure 14] This is a diagram of Embodiment 10 of the present invention. [Figure 15] This is an electron microscope image of Example 10 of the present invention. [Figure 16] This is a schematic diagram of the cross-sectional structure of the pen tip according to Embodiment 11 of the present invention. [Modes for carrying out the invention]

[0018] The present invention will be described in further detail below with reference to the attached examples. Example 1

[0019] Referring to Figures 1 and 2, the porous material pen tip consists of a head portion 1 and a handle portion 2 connected thereto. The head portion 1 and the handle portion 2 are both made of porous material. This refers to the part closest to the writing end, and the handle part 2 is connected to the barrel and draws in ink. It refers to the part that is attached to the ground.

[0020] The porous members of the head portion 1 and the handle portion 2 have different average pore diameters. Preferably, the porous member of the head portion 1 has a first average pore diameter, and the porous member of the handle portion 2 has It has a second mean pore diameter, and the first mean pore diameter is less than or equal to the second mean pore diameter. Preferably, the ratio of the first average pore size to the second average pore size is 1:5 to 1:50, and preferably The ratio of the first mean pore size to the second mean pore size can be 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:19, 1:20, 1:21, 1:22, 1:23, 1:24, 1:25, 1:26, 1:27, 1:28, 1:29, 1:30, 1:31, 1:32, 1:33, 1:34, 1:35, 1:36, 1:37, 1:38, 1:39, 1:40, 1:41, 1:42, This also includes 1:43, 1:44, 1:45, 1:46, 1:47, 1:48, and 1:49.

[0021] Preferably, the ratio of the first mean pore size to the second mean pore size is 1:1 to 1:4.999. Furthermore, the ratio of the first mean pore size to the second mean pore size can be 1:1.2, 1:1.3, 1:1.4, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, 1:2, 1:2.1, 1:2.2, 1:2.3, 1:2.4, 1:2.5, 1:2.6, 1:2.7, 1:2. 8, 1:2.9, 1:3, 1:3.1, 1:3.2, 1:3.3, 1:3.4, 1:3. 5, 1:3.6, 1:3.7, 1:3.8, 1:3.9, 1:4, 1:4.1, 1:4. 2, 1:4.3, 1:4.4, 1:4.5, 1:4.6, 1:4.7, 1:4.8, 1: 4.9 is also included.

[0022] Preferably, the average pore size of the porous material of the head portion 1 is 1 μm to 300 μm, and the handle portion 2 The average pore size of the porous member is 5 μm to 300 μm. Preferably, the head portion 1 is porous. The average pore size of the porous material and the average pore size of the porous material of the handle portion 2 are 5 μm, 10 μm, and 15 μm, respectively. , 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm , 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm , 100μm, 105μm, 110μm, 115μm, 120μm, 125μm, 130 μm, 135μm, 140μm, 145μm, 150μm, 155μm, 160μm, 1 65μm, 170μm, 175μm, 180μm, 185μm, 190μm, 195μm , 200μm, 205μm, 210μm, 215μm, 220μm, 225μm, 230 μm, 235μm, 240μm, 245μm, 250μm, 255μm, 260μm, 2 65μm, 270μm, 275μm, 280μm, 285μm, 290μm, 295μm The average pore size of the porous material of head portion 1 is 2 μm, 3 μm, and 4 μm. This is also acceptable. The statistical method for average pore size is a pore size statistic for micropores, which is a conventional measurement method. Therefore, I won't explain it in detail here.

[0023] Pen tips made from porous materials with different properties are formed by sintering porous polymer particles through a sintering process. It is manufactured by [unclear]. The pen nib is formed by primary heating and sintering. The pen nib is comfortable It provides a smooth writing experience and excellent writing performance. A typical pen nib has two sections in the handle. It consists of a handle 2 and a head 1, and the material properties of the handle 2 and the head 1, such as pore size and porosity, are important. The flow velocity and capillary force are the same. In the embodiment of the present invention, a small hole is provided in one pen nib. Two or more materials with different diameters and large hole diameters are used; for example, the hole diameter of the handle is The pore diameter is larger than that of the head portion. The porous members of the head portion 1 and the handle portion 2 have different average particle diameters. It has.

[0024] Preferably, the porous member of the head portion 1 has a first average particle size, and the porous member of the handle portion 2 has It has a second average particle diameter, and the first average particle diameter is less than or equal to the second average particle diameter. Preferably, the ratio of the first average particle diameter to the second average particle diameter is 1:2 to 1:60. The ratio of the first average particle diameter to the second average particle diameter can be 1:3, 1:4, 1:5, 1:6, 1 :7, 1:8, 1:9, 1:10, 1:11, 1:12, 1:13, 1:14, 1:15 , 1:16, 1:17, 1:18, 1:19, 1:20, 1:21, 1:22, 1:23 , 1:24, 1:25, 1:26, 1:27, 1:28, 1:29, 1:30, 1:31 , 1:32, 1:33, 1:34, 1:35, 1:36, 1:37, 1:38, 1:39 , 1:40, 1:41, 1:42, 1:43, 1:44, 1:45, 1:46, 1:47 , 1:48, 1:49, 1:50, 1:51, 1:52, 1:53, 1:54, 1:55 This also includes 1:56, 1:57, 1:58, and 1:59.

[0025] Preferably, the ratio of the first average particle diameter to the second average particle diameter is 1:1 to 1:1.999.

[0026] Preferably, the average particle size of the porous material of the head portion 1 is 3 μm to 900 μm, and the handle portion The average particle size of the porous member 2 is 6 μm to 990 μm, preferably the head portion 1 The average particle size of the porous material and the average particle size of the porous material of the handle portion 2 are 7 μm and 8 μm, respectively. 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 1 7μm, 18μm, 19μm, 20μm, 25μm, 30μm, 35μm, 40μm, 4 5μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 8 5μm, 90μm, 95μm, 100μm, 105μm, 110μm, 115μm, 12 0μm, 125μm, 130μm, 135μm, 140μm, 145μm, 150μm, 160μm, 170μm, 180μm, 190μm, 200μm, 210μm, 220μm m, 230μm, 240μm, 250μm, 260μm, 270μm, 280μm, 29 0μm, 300μm, 310μm, 320μm, 330μm, 340μm, 350μm, 360μm, 370μm, 380μm, 390μm, 400μm, 410μm, 420μm m, 430μm, 440μm, 450μm, 460μm, 470μm, 480μm, 49 0μm, 500μm, 510μm, 520μm, 530μm, 540μm, 550μm, 560μm, 570μm, 580μm, 590μm, 600μm, 610μm, 620μm m, 630μm, 640μm, 650μm, 660μm, 670μm, 680μm, 69 0μm, 700μm, 710μm, 720μm, 730μm, 740μm, 750μm, 760μm, 770μm, 780μm, 790μm, 800μm, 810μm, 820μm m, 830μm, 840μm, 850μm, 860μm, 870μm, 880μm, 89 0μm, 900μm, 910μm, 920μm, 930μm, 940μm, 950μm, Includes 960 μm, 970 μm, and 980 μm. The average particle size of the porous material of head section 1 is: 4 μm, 5 μm, or 6 μm are also acceptable.

[0027] Preferably, the particles in the head portion 1 and the particles in the handle portion 2 have different particle size distributions. The handle portion 2 of the core requires a fast flow rate and low capillary force, thereby allowing the liquid to enter the reservoir. The liquid can then be drawn into the head portion 1 of the pen nib. The head portion 1 of the pen nib is such that the liquid flow rate It is slow, but designed to have high capillary action. The purpose of this design is the handle of the pen nib. The liquid is drawn in from the second point and flows smoothly onto the writing surface, providing a comfortable writing experience and superior writing performance. The goal is to provide a refined writing experience. This pen tip design allows for a finer, more responsive writing experience. The liquid moves from the reservoir to the handle 2 by the force of the pipe, and then through the handle 2 to the head 1. The tip then passes through the end of the head portion 1 and makes contact with the writing surface. The porous structure of the head portion 1 and the handle portion 2 The components have different porosity levels.

[0028] Preferably, the porous member of the head portion 1 has a first porosity, and the porous member of the handle portion 2 has a second porosity. It has two porosity levels, where the first porosity is less than or equal to the second porosity. Preferably, the ratio of the first porosity to the second porosity is 1:1.1 to 1:40, and preferably The ratio of primary porosity to secondary porosity can be 1:1.11, 1:1.12, 1:1.13, or 1: 1.14, 1:1.15, 1:1.16, 1:1.17, 1:1.18, 1:1.19, 1:1.20, 1:1.21, 1:1.22, 1:1.23, 1:1.24, 1:1.2 5, 1:1.26, 1:1.27, 1:1.28, 1:1.29, 1:1.30, 1:1 .31, 1:1.32, 1:1.33, 1:1.34, 1:1.35, 1:1.36, 1 :1.37, 1:1.38, 1:1.39, 1:1.40, 1:1.41, 1:1.42 , 1:1.43, 1:1.44, 1:1.45, 1:1.46, 1:1.47, 1:1. 48, 1:1.49, 1:1.5, 1:1.6, 1:1.7, 1:1.8, 1:1.9, 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:1 1, 1:12, 1:13, 1:14, 1:15, 1:16, 1:17, 1:18, 1:1 9, 1:20, 1:21, 1:22, 1:23, 1:24, 1:25, 1:26, 1:2 7, 1:28, 1:29, 1:30, 1:31, 1:32, 1:33, 1:34, 1:3 This also includes 5, 1:36, 1:37, 1:38, and 1:39.

[0029] Preferably, the ratio of the first porosity to the second porosity is 1:1 to 1:1.109. Preferably, the porosity of the porous material of the head portion 1 is 2.5% to 90%, and the pores of the handle portion 2 are The porosity of the porous member is 5% to 78%, preferably the pores of the porous member of the head portion 1. The porosity of the porous material of the handle portion 2 is also 2.5%, 2.6%, 2.7%, and 2.8%. %, 2.9%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, This includes 76%, 78%, 80%, 82%, 84%, 86%, 88%, and 89%.

[0030] Preferably, the head portion 1 and the handle portion 2 have different rigidities. Preferably, the head portion 1 and the handle portion 2 are of different colors. Preferably, the porous members of the head portion 1 and the handle portion 2 have different capillary forces, and the head portion The capillary force of part 1 is greater than the capillary force of part 2 of the pen tip. Capillary force is required, which draws the liquid from the reservoir to the head part 1 of the pen nib. It will become possible. The head part 1 of the pen tip is designed so that the liquid flow rate is low but the capillary force is high. It is designed to draw liquid from the handle of the pen nib and apply it to the writing surface. It flows smoothly, providing a comfortable and superior writing experience. This is the result. With this type of pen tip design, the liquid is drawn into the pen's reservoir by capillary action. The pen moves from the handle 2 to the head 1, and then the head 1 touches the writing surface. Let them touch it.

[0031] The pen tip made of porous material is composed of porous members. The porous members are bonded together by at least one joint It has three surfaces, Preferably, both sides of the joining surface have different porosity levels. Preferably, both sides of the bonding surface have different average particle diameters. Preferably, both sides of the joint surface have different average pore diameters and / or capillary forces. Preferably, among the n segments of the pen tip body, the i-th segment closest to the head portion 1 is , compared to the j-th segment near the stalk 2, it has a different porosity, and / or, Having different average particle diameters, and / or, Having different average pore sizes, and / or, They have different capillary forces, where n is a natural number less than 100, and i <n、かつj<n The specific measurement method is exemplified below: The pen tip is moved in the direction of ink flow. Divide it into n equal segments along the line, for example, n=5. Of these, the first segment The section includes the writing surface contact end of the pen tip head 1, and thus the fifth section This includes the end of the handle. According to this definition, the second segment (i.e., i=2) and the fourth Two parameters of the segment (i.e., j=4), such as average pore size, average particle size, porosity, etc. Measure and compare the meters to determine if they are the same or different.

[0032] The pen tip made of porous material uses a sintered porous body containing plastic powder. The materials used include polyolefin, polyamide, polyester, rigid polyurethane, and polyacryloyl. Nitrile, polycarbonate, polyvinyl chloride, polymethyl methacrylate, polyfluoride Vinylidene, polytetrafluoroethylene, polyethersulfone, polystyrene, poly Etherimides, polyetheretherketones or polysulfones, and combinations thereof This includes combinations and / or copolymers thereof.

[0033] Preferably, the head portion 1 is composed of plastic powder and porous material. The material powder of the handle portion 2 has different particle size distributions. The particle size distribution is expressed as Mv / Mn. A writing instrument manufactured with a pen nib made of porous material, that is, in the technical solution of the present invention This brush is manufactured using a porous material.

[0034] In this invention, the method for calculating porosity is as follows: First, the mass and apparent body Immerse a pen nib or part of a pen nib whose mass is known (for example, a pen nib separated into a head and a handle) in water. After soaking and allowing the water to fully penetrate, the pen nib is removed from the water and its mass is measured. From the mass, the volume of water immersed in the pen nib is derived. This volume of water is then measured in the pores of the pen nib. Treating it as equivalent to a product, the porosity is calculated using the following formula A. Porosity (unit: %) = (volume of water) / (apparent volume of pen nib) × 100 (Equation A)

[0035] In this invention, "average particle diameter" refers to the average diameter of particles measured using an electron microscope. This value represents the average particle size measured for 20 particles projected onto an electron microscope image. Yes. If the particle is not circular, then of the line segments connecting any two points that form the outline of the pore, The particle diameter of a particle is calculated by adding the length of the longest line segment to the length of the shortest line segment and dividing the result by 2. Let's assume that.

[0036] This invention will be explained using axe-shaped pen nibs, U-shaped pen nibs, and conical pen nibs as representative examples. In this embodiment, an axe-shaped pen tip is used as an example. In Figure 2, the joining surface 3 is connected to the head portion 1. It is precisely positioned at the connection point with the handle part 2.

[0037] Example 2: Referring to Figure 3, in this example, based on the above-described example, the joint surface 3 is the head It is located in part 1.

[0038] Example 3: Referring to Figure 4, in this example, based on the previously described example, the joint surface 3 is the handle portion 2 It is located in that part.

[0039] Example 4: Referring to Figures 5 and 6, based on the above-described example, this example is a U-shaped pen This is the core. In Figure 6, the joint surface 3 is such that the cross-sectional area of ​​the two handle parts 2 and the head part 1 changes. It is located near the base.

[0040] Comparative experiments have shown that the technical solution of the present invention involves the particle size, pore size, and porosity of the head portion. Because it is smaller, the abrasion resistance test will be performed under the same ink supply conditions (water absorption characteristics). The test method is as follows: As follows: A nib is attached to a barrel of the same specifications, and the initial thickness of the writing end of the nib (Xa ) Measure the distance, then attach it to the writing machine, set the writing distance to 200m, and start the writing machine. After recording, the thickness of the writing end of the pen tip (Xb) was measured, and in this case, after 200m of writing. The degree of wear of the pen tip is (Xa~Xb). In the test example of the present invention, the degree of wear is 0.06 The range is 47mm to 0.1997mm, with an average of 0.1148mm. With conventional technology, The average wear is 0.1731 mm. Comparative experiments are conducted under the same conditions, structure, and method. Therefore, I will not explain it in detail below.

[0041] To compare water absorption properties, place the pen tip vertically into the water (they are stained for easier testing). When the pen tip 1 is placed in the water, the water surface submerges the tip of the handle 2 by about 3 mm. Handle side (handle 2 Water is absorbed from the writing side (pen tip 1) to the writing side. This water absorption time is recorded. Test operation of the present invention In the case study, the water absorption time ranged from 5.44s to 10.91s, with an average of 7.26s. On the other hand, With conventional technology, the average time is 7.99 seconds.

[0042] In the preferred solution of this embodiment, the test results of the product are as follows (Table 1).

[0043] [Table 1]

[0044] Hardness comparison: A simple test method involves placing the pen tip samples from the examples into a jig (two hard plates) It is placed on the (platform), exposing about half of the pen tip 1, and directed vertically (from the pen tip 1) on the pressure block. A pressure displacement distance (0.81 mm) is set along the handle portion 2 and parallel to the axial direction of the handle portion 2. The hardness (N) is recorded. In the test technique of the present invention, this hardness is 11.04N~ The value is 13.85N, with an average of 11.978N. In conventional technology, the average is 9.938N. That is the case.

[0045] Rigidity range: A simple test method involves placing the pen tip sample from the example into a jig (two hard plates) Place it on the cutting board, exposing about half of the pen tip, and move it horizontally (handle part) on the cutting board. The pressure displacement distance (0.20 mm) is set perpendicular to the axis direction of 2 and perpendicular to the plane of the pen tip. Then, after applying pressure, remove the pen tip and test its bending angle (rigidity) under a microscope. In the Ming Test Technology solution, the stiffness ranged from 0.42° to 1.56°, with an average of 1.04°. With conventional technology, the average is 4.39°.

[0046] Therefore, the technical solution of the present invention is that the porosity, pore size, and particle size of the pen tip are smaller. Compared to conventional technology, the pen tip has improved wear resistance, the ink supply is more continuous, and water absorption is improved. It is fast, and the pen tip is superior in terms of hardness, rigidity, and strength.

[0047] Example 5: Referring to Figure 7, in this example, based on the previously described example, the joint surface 3 is on the handle portion 2. The three different points on the joint surface of the handle portion 2 are located and may have different or the same depth (details (Omitted).

[0048] Example 6: Referring to Figures 8 and 9, in this example, based on the above example, the bonding surface 3 It may be located in the head portion 1.

[0049] Example 7: Referring to Figures 10 and 11, based on the above-described example, this example is conical This is the pen tip. In Figure 11, the joint surface 3 changes the cross-sectional area of ​​the two handle parts 2 and the head part 1. It is located near the connection point.

[0050] Example 8: Referring to Figure 12, in this example, based on the previously described example, the joint surface 3 is the handle portion 2 It is located in [location].

[0051] Example 9: Referring to Figure 13, in this example, based on the previous example, the joint surface 3 is the head It is located in part 1. The joint surface 3 is shown as a plane in the drawing, but in the actual product it is The surface may also be irregular. In other words, the joint surface 3 may be a nearly flat surface, an irregular surface, or This is a clear particle transition zone. A particle transition zone is a region formed when different powders become intertwined. This region is clearly defined, and on either side of this region there are corresponding single regions composed of different powders. To exist.

[0052] Example 10: Referring to Figures 14 and 15, at least a portion of the head portion 1 is attached to the handle portion 2. Or the head part 1 is a different color from the rest of the head part 1. In other words, in the process of manufacturing the pen nib, grain Small diameter plastic powder raw materials are colored and sintered to create a porous pen tip. In this way, by indicating the position of the fine plastic powder with different colors, the fine plastic powder This will allow users to determine whether the stick is worn out. It can also be distinguished from products using this technology. Of course, plastic powder with larger particle sizes The raw materials can also be colored. Raw material powders with different particle sizes can all be colored differently. Figure 15 shows a partial electron microscope image of the present invention.

[0053] Example 11: Referring to Figure 16, the porous material pen tip of this example comprises a head portion 1 and The head portion 1 and the handle portion 2 are all made of porous material, and the head portion 1 and the handle portion 2 are connected to the head portion 1. The porous members of the head portion 1 and the handle portion 2 have different average pore diameters. In the pen tip of this embodiment, the porous member of the head portion 1 has a first average pore diameter, and the handle portion 2 is porous. The material has a second average pore diameter, and the first average pore diameter is smaller than the second average pore diameter. (Head section) There is no clear interface between the hole diameter of part 1 and the hole diameter of part 2 of the handle. The hole diameter of part 2 is larger than the hole diameter of head part 1, and as shown in the embodiment in Figure 2, the handle part 2 and the head A relatively clear interface exists between part 1 and part 1 where the particle size and / or pore size change significantly. Rather, the hole diameter decreases regularly or irregularly along the direction from the handle portion 2 to the head portion 1. ru.

[0054] The porous material of the head portion 1 and the handle portion 2 uses the same standard particle material, so sintering is performed. Each part of the molded pen nib has approximately the same average particle size. Typically, they are manufactured according to specific standards or specifications and have the same size, shape, and characteristics. This refers to particles. These particles have consistent material composition, physical properties, and chemical properties. It is suitable for use in various industrial and scientific research fields. The fact that the shape and characteristics are the same does not necessarily mean that, from the perspective of common sense in that field, This does not mean that all particles are identical, and should not be interpreted in a narrow sense. For example, the raw material particles used in the sintering process are particles of different specifications from different manufacturers. If it's not a mixture of raw materials, but from a single production batch from the same supplier, then the same specifications It should be considered to be of a certain quality. As another example, the average particles of head 1 after sintering. Even if the difference between the diameter and the average particle diameter of the handle portion 2 is less than 20%, they are considered to be of the same standard. It should be. As shown in the enlarged sections A and B of Figure 16, the circles represent schematic diagrams of particulate materials. This does not mean that the actual particles are perfectly spherical. The space between the circles is important. This represents a pore, and the method for measuring the pore size of a pore is as described above.

[0055] Preferably, the difference between the average particle diameter of the head portion 1 and the average particle diameter of the handle portion 2 is less than 20%. The aforementioned differences in average particle size are 19%, 18%, 17%, 16%, 15%, 14%, and 1%. 3%, 12%, 11%, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1 The percentages may be %, 0.5%, 0.3%, or 0.1%. This embodiment uses an axe-shaped pen tip, a U-shaped The pen tip may have a conical shape, or other shapes, and may overlap for display purposes. No drawings are required.

[0056] Although the present invention has been described with reference to preferred embodiments, these embodiments do not limit the present invention. This invention is not a prescriptive invention, and those skilled in the art will, without departing from the spirit and scope of the present invention, hereby explain. Various changes, equivalent substitutions, and modifications can be made to the described subject matter, The scope of protection of this invention shall be limited to the scope defined by the claims. [Explanation of Symbols]

[0057] 1. Head section 2 Handle 3 Joint surface

Claims

1. A pen tip made of a porous material, comprising a head portion (1) and a handle portion (2) connected thereto. 、 The head portion (1) and the handle portion (2) are all made of porous material, and the head portion ( 1) and the porous member of the handle portion (2) have different average pore diameters, and the head portion (1) The porous member has a first average pore diameter, and the porous member of the handle portion (2) has a second average pore diameter. The first average pore diameter is smaller than the second average pore diameter, and the head portion (1) and the The porous material of the handle portion (2) uses the same particle material as the head portion (1) The difference between the average particle diameter and the average particle diameter of the handle portion (2) is less than 20%, and the head portion ( 1) and the pedestal portion (2) have clear boundaries between the particle size and / or pore size, and the he The porous members of the head portion (1) and the handle portion (2) have different porosities, and the head portion (1 The porous member of the ) has a first porosity, and the porous member of the handle portion (2) has a second porosity. Furthermore, the first porosity is smaller than the second porosity, characterized in that the porous material is manufactured Core.

2. The aforementioned product is characterized in that the ratio of the first porosity to the second porosity is 1:1.1 to 1:

40. A pen tip made of porous material as described in Item 1.

3. The head portion (1) is characterized in that at least a part of it is a different color from the rest of it. A pen tip made of porous material as described in Item 1.

4. It is a writing instrument, It is manufactured using a pen tip made of porous material as described in any one of claims 1 to 3. A writing instrument that is a defining feature.

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