A porous material pen core and writing tool

Abstract

The invention discloses a porous material pen core and a writing tool, comprising a head and a handle connected thereto, wherein the head and the handle are both made of porous components. The head refers to a side portion close to the writing end, and the handle is a side portion connected to the pen tube and absorbing ink. The invention has the advantages of smooth writing, continuous ink supply, uniform color development, and toughness and durability.

Description

Technical Field

[0001] The invention relates to the field of fluent writing pen core materials, in particular to a porous material pen core and a writing tool. Background Art

[0002] The nibs of writing tools such as paint markers and underline markers are widely used because they have a wide core and can draw wide lines. The visibility and workability of the marks are excellent. The nibs of writing tools such as line markers are generally made by applying capillary action to a porous member, such as a member formed by aggregating synthetic resin fibers into a rod shape, or a sintered body of a polymer, so that writing can be performed. Porous plastic structures, including writing nibs, are generally manufactured by sintering particles of thermoplastic materials together.

[0003] Prior art, such as publication number CN112888576B, records a writing tool, the nib of which is a nib with a refill containing a masking material, and the brightness of the refill in the L*a*b* (CIE LAB) colorimetric system is above 80. As the writing tool, it includes: a retaining body, which has a visible portion that can visually confirm the writing direction, for example; and a nib of the above structure, which is mounted on the retaining body. For another example, US20220041006A1 discloses a nib and a related writing tool, wherein the nib has a nib shell, and the nib shell includes a flexible upper writing portion and a lower portion connected to the flexible upper writing portion. The lower portion of the nib shell is configured to deliver ink to the flexible upper writing portion, and the flexible upper writing portion is configured to deliver ink to the writing surface. The flexible upper writing portion of the nib box includes a flat chisel-shaped tip at the upper end of the flexible upper writing portion. When a force of less than about 0.1 lbs is applied, the nib can effectively deliver ink to the writing surface.

[0004] Publication No. JP7420905B2 also discloses a writing tool, the porosity of which is 30-70%. The ink composition for writing tools contains colored resin particles with an average particle size of 1-10 μm. The viscosity of the ink is 8 to 20 mPa·s·A, and the particle size distribution (Mv / Mn) of the colored resin particles is 1-3. Publication No. US3942903A discloses an integral porous thermoplastic writing pen tip, which provides a porous thermoplastic product with uniform pore size and an improved writing pen tip. The above prior arts are all single material technologies. Summary of the invention

[0005] The purpose of the present invention is to provide a porous material pen core with smooth writing, continuous ink supply, uniform color development, toughness and durability in view of the prior art.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a porous material pen core, which is composed of a head and a handle connected thereto, wherein: the head and the handle are both composed of porous components. The head refers to a side portion close to the writing end, and the handle is a side portion connected to the pen tube and absorbing ink. The above naming is only for the convenience of indicating the relative position of the pen core, so as to facilitate understanding and reading. The head and the handle cannot be considered as two independent components.

[0007] In order to optimize the above technical solution, the measures taken also include: the porous components of the head and the handle have different average pore sizes;

[0008] Preferably, the porous component of the head has a first average pore size, and the porous component of the handle has a second average pore size; the first average pore size is less than or equal to the second average pore size;

[0009] Preferably, the ratio of the first average pore size to the second average pore size is 1:5 to 1:50;

[0010] Preferably, the ratio of the first average pore size to the second average pore size is 1:1 to 1:4.999.

[0011] Preferably, the average pore size of the porous component of the head is 1µm to 300µm; the average pore size of the porous component of the handle is 5µm to 300µm. Porous material refills with different properties are made of sintered porous polymer particles through a sintering process. The refill is formed by heating and sintering once. The refill provides a comfortable writing experience and a good writing effect. In general refills, the handle and the head have the same material properties, such as pore size, porosity, flow rate and capillary force. In an embodiment of the present invention, two types or more performance materials are used in a single refill, which have different properties of lower pore size and higher pore size, for example, the pore size of the handle is larger than the pore size of the head. The porous components of the head and the handle have different average particle sizes;

[0012] Preferably, the porous component of the head has a first average particle size, and the porous component of the handle has a second average particle size; the first average particle size is less than or equal to the second average particle size;

[0013] Preferably, the ratio of the first average particle size to the second average particle size is 1:2 to 1:60;

[0014] Preferably, the ratio of the first average particle size: the second average particle size is 1:1 to 1:1.999.

[0015] Preferably, the average particle size of the porous member of the head is 3µm to 900µm; the average particle size of the porous member of the handle is 6µm to 990µm;

[0016] Preferably, the particles in the head and the particles in the handle have different particle size distributions. The handle of the refill is required to have a high flow rate and a low capillary force, which enables the liquid to be drawn from the reservoir to the head of the refill. The head of the refill is designed to have a lower liquid flow rate but a higher capillary force. The purpose of this design is to draw liquid from the handle of the refill to the writing surface smoothly and provide a comfortable writing experience and a good writing effect. This refill design allows the capillary force to move the liquid from the reservoir to the handle, through the handle to the head, and contact the writing surface through the end of the head. The porous components of the head and the handle have different porosities;

[0017] Preferably, the porous component of the head has a first porosity, and the porous component of the handle has a second porosity; the first porosity is less than or equal to the second porosity;

[0018] Preferably, the ratio of the first porosity to the second porosity is 1:1.1 to 1:40;

[0019] Preferably, the ratio of the first porosity: the second porosity is 1:1 to 1:1.109;

[0020] Preferably, the porosity of the porous component of the head is 2.5% to 90%; the porosity of the porous component of the handle is 5% to 78%;

[0021] Preferably, the head and the handle have different stiffnesses;

[0022] Preferably, the head and the handle are of different colors;

[0023] Preferably, the porous components of the head and the handle have different capillary forces, and the capillary force of the head is greater than that of the handle. The flow rate of the head is lower than that of the handle. The handle of the refill needs to have a high flow rate and a low capillary force, which enables the liquid to be drawn from the reservoir to the head of the refill. The head of the refill is designed to have a lower liquid flow rate but a higher capillary force. The purpose of this design is to draw liquid from the handle of the refill to flow smoothly to the writing surface and provide a comfortable writing experience and a good writing effect. This refill design allows the capillary force to move the liquid from the reservoir to the handle, through the handle to the head, so that the head contacts the writing surface.

[0024] A porous material pen core, which is composed of a porous component. The porous component has at least one connecting surface;

[0025] Preferably, the two sides of the joint surface have different porosities;

[0026] Preferably, the two sides of the joint surface have different average particle sizes;

[0027] Preferably, both sides of the joining surface have different average pore diameters and / or capillary forces;

[0028] Preferably, among the n segments of the refill body, the i-th segment near the head has a different porosity compared to the j-th segment near the handle; and / or,

[0029] has different average particle sizes; and / or,

[0030] has different average pore diameters; and / or,

[0031] has different capillary forces; where n is a natural number less than 100, i < n, and j < n. An example of the specific measurement method is as follows: divide the refill body into n equal segments along the ink flow direction, for example, n = 5. Among them, the first segment contains the writing surface contact end of the refill head, and so on, and the fifth segment contains the end of the handle. Under this definition, compare the average pore diameters of the second segment (i.e., i = 2) and the fourth segment (i.e., j = 4), and measure and judge whether they are the same or different.

[0032] The refill uses a porous body made of sintered plastic powder. The plastic includes polyolefin, polyamide, polyester, rigid polyurethane, polyacrylonitrile, polycarbonate, polyvinyl chloride, polymethyl methacrylate, polyvinylidene fluoride, polytetrafluoroethylene, polyethersulfone, polystyrene, polyetherimide, polyetheretherketone, or polysulfone and their combinations and / or their copolymers;

[0033] Preferably, at least part of the porosity near the writing end of the porous body is less than the porosity near the ink absorption end of the porous body;

[0034] Preferably, at least part of the average particle size near the writing end of the porous body is less than the average particle size near the ink absorption end of the porous body;

[0035] Preferably, at least part of the average pore diameter near the writing end of the porous body is less than the average pore diameter near the ink absorption end of the porous body;

[0036] Preferably, the plastic powder of the head formed by the porous body has a different particle size distribution from the plastic powder of the handle formed by the porous body. The particle size distribution is measured by Mv / Mn.

[0037] The present invention also discloses a writing tool prepared from the above-mentioned porous material refill.

[0038] Since the present invention uses both the head and the handle as porous components. The head refers to the part on the side near the writing end, and the handle is the part on the side connected to the pen tube and sucking ink. Therefore, the present invention has the advantages of smooth writing, continuous ink supply, uniform color display, and toughness and durability. Description of the Drawings

[0039] Figure 1 This is a schematic diagram of the main structure of the pen core of Example 1 of the present invention;

[0040] Figure 2 This is a schematic diagram of the cross-sectional structure of a pen core in Example 1 of the present invention;

[0041] Figure 3 This is a schematic diagram of the cross-sectional structure of a pen core in Example 2 of the present invention;

[0042] Figure 4 This is a schematic diagram of the cross-sectional structure of a pen core in Example 3 of the present invention;

[0043] Figure 5 This is a schematic diagram of the main structure of the pen core of Example 4 of the present invention;

[0044] Figure 6 This is a schematic diagram of the cross-sectional structure of a pen core in Example 4 of the present invention;

[0045] Figure 7 This is a schematic diagram of the cross-sectional structure of a pen core in Example 5 of the present invention;

[0046] Figure 8 This is a schematic diagram of the cross-sectional structure of a pen core in Example 6 of the present invention;

[0047] Fig. 9 This is a partial structural enlarged schematic diagram of Example 6 of the present invention;

[0048] Fig.10 This is a schematic diagram of the main structure of the pen core of Example 7 of the present invention;

[0049] Fig.11 This is a schematic diagram of the cross-sectional structure of a pen core in Example 7 of the present invention;

[0050] Fig.12 This is a schematic diagram of the cross-sectional structure of a pen core in Example 8 of the present invention;

[0051] Fig.13 This is a schematic diagram of the cross-sectional structure of a pen core according to Embodiment 9 of the present invention;

[0052] Fig.14 This is a physical diagram of Embodiment 10 of the present invention;

[0053] Fig.15 This is an electron microscope photograph of Example 10 of the present invention;

[0054] Fig.16 Schematic diagram of the cross-sectional structure of the pen core according to embodiment 11 of the present invention. DETAILED DESCRIPTION

[0055] The present invention is further described in detail below in conjunction with the attached examples.

[0056] Description of the accompanying drawings: head 1, handle 2, connecting surface 3.

[0057] Example 1: Reference Figure 1 to Figure 2 A porous material pen core comprises a head 1 and a handle 2 connected thereto, wherein the head 1 and the handle 2 are both made of porous components. The head 1 refers to a side portion close to the writing end, and the handle 2 is a side portion connected to the pen tube and absorbing ink.

[0058] The porous components of the head 1 and the handle 2 have different average pore sizes;

[0059] Preferably, the porous component of the head 1 has a first average pore size, and the porous component of the handle 2 has a second average pore size; the first average pore size is less than or equal to the second average pore size;

[0060] Preferably, the ratio of the first average pore size to the second average pore size is 1:5 to 1:50; preferably, the ratio of the first average pore size to the second average pore size also includes: 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.

[0061] Preferably, the ratio of the first average pore size to the second average pore size is 1:1 to 1:4.999. Preferably, the ratio of the first average pore size: the second average pore size also includes: 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.

[0062] Preferably, the average pore size of the porous component of the head 1 is 1µm to 300µm; the average pore size of the porous component of the handle 2 is 5µm to 300µm. Preferably, the average pore size of the porous component of the head 1 and the average pore size of the porous component of the handle 2 are 5µm, 10µm, 15µm, 20µm, 25µm, 30µm, 35µm, 40µm, 45µm, 50µm, 55µm, 60µm, 65µm, 70µm, 75µm, 80µm, 85µm, 90µm, 95µm, 100µm, 105µm, 110µm, 115µm, 120µm, 125µm, 130µm, 135µm, 140µm, 145 The average pore size of the porous component of the head 1 can also be 2µm, 3µm, or 4µm. The statistical method of the average pore size is the micropore pore size statistics, which belongs to the conventional measurement method and will not be described again.

[0063] The porous material refills with different properties are made of sintered porous polymer particles through a sintering process. The refills are formed by heating and sintering once. The refills provide a comfortable writing experience and a good writing effect. In a general refill, it is composed of a handle 2 and a head 1, and has the same material properties, such as pore size, porosity, flow rate and capillary force. In an embodiment of the present invention, two types or more performance materials are used in a single refill, which have different properties of lower pore size and higher pore size, for example, the pore size of the handle is larger than the pore size of the head. The porous components of the head 1 and the handle 2 have different average particle sizes;

[0064] Preferably, the porous component of the head 1 has a first average particle size, and the porous component of the handle 2 has a second average particle size; the first average particle size is less than or equal to the second average particle size;

[0065] Preferably, the ratio of the first average particle size to the second average particle size is 1:2 to 1:60; preferably, the ratio of the first average particle size to the second average particle size also includes: 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 6. 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, 1:56, 1:57, 1:58, 1:59.

[0066] Preferably, the ratio of the first average particle size to the second average particle size is 1:1 to 1:1.999. Preferably, the average particle size of the porous component of the head 1 is 3µm to 900µm; the average particle size of the porous component of the handle 2 is 6µm to 990µm; preferably, the average particle size of the porous component of the head 1 and the average particle size of the porous component of the handle 2 also include: 7µm, 8µm, 9µm, 10µm, 11µm, 12µm, 13µm, 14µm, 15µm, 16µm, 17µm, 18µm, 19µm, 20µm, 25µm, 30µm, 35µm, 40µm, 45µm, 50µm, 55µm, 60µm, 65µm, 70µm, 75µm, 80µm, 85µm, 90µm, 95µm, 100µm, 105µm, 110µm, 115µm, 120µm, 125µm, 130µm, 135µm, 140µm, 145µm, 150µm , 160µm, 170µm, 180µm, 190µm, 200µm, 210µm, 220µm, 230µm, 240µm, 250µm, 260µm, 270µm, 280µm, 290µm, 300µm, 310µm, 320 µm, 330µm, 340µm, 350µm, 360µm, 370µm, 380µm, 390µm, 400µm, 410µm, 420µm, 430µm, 440µm, 450µm, 460µm, 470µm, 480µm, 490µm, 500µm, 510µm, 520µm, 530µm, 540µm, 550µm, 560µm, 570µm, 580µm, 590µm, 600µm, 610µm, 620µm, 630µm, 640µm, 650µ m, 660µm, 670µm, 680µm, 690µm, 700µm, 710µm, 720µm, 730µm, 740µm, 750µm, 760µm, 770µm, 780µm, 790µm, 800µm, 810µm, 82 0µm, 830µm, 840µm, 850µm, 860µm, 870µm, 880µm, 890µm, 900µm, 910µm, 920µm, 930µm, 940µm, 950µm, 960µm, 970µm, 980µm. The average particle diameter of the porous member of the head 1 may also be 4µm, 5µm, or 6µm.

[0067] Preferably, the particles of the head 1 and the particles of the handle 2 have different particle size distributions. The handle 2 of the refill is required to have a high flow rate and a low capillary force, which enables the liquid to be drawn from the reservoir to the head 1 of the refill. The head 1 of the refill is designed to have a lower liquid flow rate but a higher capillary force. The purpose of this design is to draw liquid from the handle 2 of the refill to the writing surface smoothly and provide a comfortable writing experience and a good writing effect. This refill design allows the capillary force to move the liquid from the reservoir to the handle 2, through the handle 2 to the head 1, and contact the writing surface through the end of the head 1. The porous components of the head 1 and the handle 2 have different porosities;

[0068] Preferably, the porous component of the head 1 has a first porosity, and the porous component of the handle 2 has a second porosity; the first porosity is less than or equal to the second porosity;

[0069] 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 also includes: 1:1.11, 1:1.12, 1:1.13, 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, 1:1.25, 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、1:11、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.

[0070] Preferably, the ratio of the first porosity: the second porosity is 1:1 to 1:1.109;

[0071] Preferably, the porosity of the porous component of the head 1 is 2.5% to 90%; the porosity of the porous component of the handle 2 is 5% to 78%; preferably, the porosity of the porous component of the head 1 and the porosity of the porous component of the handle 2 also include: 2.5%, 2.6%, 2.7%, 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%, 76%, 78%, 80%, 82%, 84%, 86%, 88%, 89%.

[0072] Preferably, the head 1 and the handle 2 have different stiffnesses;

[0073] Preferably, the head 1 and the handle 2 have different colors;

[0074] Preferably, the porous components of the head 1 and the handle 2 have different capillary forces, and the capillary force of the head 1 is greater than the capillary force of the handle 2. The handle 2 of the refill is required to have a high flow rate and a low capillary force, which enables the liquid to be drawn from the reservoir to the head 1 of the refill. The head 1 of the refill is designed to have a lower liquid flow rate but a higher capillary force, the purpose of which is to draw liquid from the handle of the refill to flow smoothly to the writing surface, and to provide a comfortable writing experience and a good writing effect. This refill design allows the capillary force to move the liquid from the reservoir of the pen to the handle 2, through the handle 2 to the head 1, so that the head 1 contacts the writing surface.

[0075] A porous material pen core, which is composed of a porous component. The porous component has at least one connecting surface 3;

[0076] Preferably, the two sides of the joint surface have different porosities;

[0077] Preferably, the two sides of the joint surface have different average particle sizes;

[0078] Preferably, the two sides of the interface have different average pore sizes and / or capillary forces;

[0079] Preferably, among the n segments of the refill body, the i-th segment close to the head 1 has a different porosity than the j-th segment close to the handle 2; and / or,

[0080] having different average particle sizes; and / or,

[0081] having different average pore sizes; and / or,

[0082] having different capillary forces; where n is a natural number less than 100, i < n and j < n. The specific measurement method is exemplified as follows. The pen core body is divided into equal n segments along the ink flow direction. For example, n = 5. Among them, the first segment contains the writing surface contact end of the pen head 1, and so on, and the fifth segment contains the end of the handle. Under this definition, compare the parameters of the second segment (i.e., i = 2) and the fourth segment (i.e., j = 4), such as average pore size, average particle size, porosity, etc., and measure and judge whether they are the same or different.

[0083] The porous material pen core is made of a porous body formed by sintering plastic powder. The plastics include polyolefins, polyamides, polyesters, rigid polyurethanes, polyacrylonitriles, polycarbonates, polyvinyl chlorides, polymethyl methacrylates, polyvinylidene fluorides, polytetrafluoroethylenes, polyethersulfones, polystyrenes, polyetherimides, polyetheretherketones or polysulfones and their combinations and / or their copolymers;

[0084] Preferably, the plastic powders of the head 1 formed by the porous body and the plastic powders of the handle 2 formed by the porous body have different particle size distributions. The particle size distribution is measured by Mv / Mn.

[0085] A writing tool prepared from a porous material pen core. That is, a pen made of a porous material containing the technical solution of the present invention.

[0086] In the present invention, the porosity is calculated as follows: First, immerse a pen core or a pen core segment with a known mass and apparent volume (for example, separate the pen core into the head and the handle) in water. After the water has fully penetrated, measure the mass in the state after taking it out of the water. From the measured mass, derive the volume of water immersed in the pen core. Consider the volume of this water to be the same as the pore volume of the pen core, and calculate the porosity by the following formula A.

[0087] Porosity (unit: %) = (volume of water) / (apparent volume of pen core) × 100 (Formula A)

[0088] In the present invention, the "average particle size" represents the average value of the diameters of the particles measured by an electron microscope, which is the average value of the particle sizes measured for 20 particles projected into the image of the electron microscope. In the case where the particles are non-circular, add the length of the longest line segment and the length of the shortest line segment connecting any two points on the contour forming the pores, and divide the sum by 2, and set the obtained value as the particle size of the particle.

[0089] The present invention selects an axe-shaped pen core, a U-shaped pen core, and a conical pen core as examples for further illustration. This embodiment takes the axe-shaped pen core as an example. In Figure 2 it, the connection surface 3 is exactly located at the connection part between the head 1 and the handle 2.

[0090] Example 2: Refer to Figure 3 In this embodiment, based on the above-mentioned embodiment, the connection surface 3 is located at the head 1 .

[0091] Example 3: Reference Figure 4 In this embodiment, based on the above-mentioned embodiment, the connection surface 3 is located at the handle 2 .

[0092] Example 4: Reference Figures 5 and 6 Based on the above-mentioned embodiment, this embodiment is a U-shaped pen core. Figure 6 In the embodiment, the connecting surface 3 is located near the position where the cross-sectional areas of the two handles 2 and the head 1 are transformed.

[0093] After comparative experiments, the technical solution of the present invention has a smaller particle size, pore size and porosity in the head, so it can be tested for wear resistance under the same ink supply (water absorption performance). The test method is: install the pen core on the pen holder of the same specification, measure the initial thickness (Xa) of the writing end of the pen tip, and then install it in the writing machine, set a writing distance of 200m, let the writing machine start writing, and then measure the thickness (Xb) of the writing end of the pen tip, then the wear of the pen tip after writing for 200m is (Xa - Xb). The wear of the test embodiment of the present invention is between 0.0647mm and 0.1997mm, with an average of 0.1148mm; while the average wear of the prior art is 0.1731mm. The comparative experiments are all compared under the same conditions, structure, and method, which will not be repeated in the following text.

[0094] For comparison of water absorption performance, the pen tip can be placed vertically in water (dyed for easy inspection). When the pen tip 1 is placed in water, the water surface submerges 3mm from the end of the handle 2, and water is absorbed from the handle end (handle 2) to the writing end (pen tip 1). The water absorption time is recorded. The test embodiment of the present invention is 5.44s to 10.91s, with an average of 7.26; while the average of the prior art is 7.99s.

[0095] In a preferred embodiment of this embodiment, the product test results are as follows (Table 1):

[0096]

[0097] Hardness comparison: Simple test method, install the sample of the embodiment refill in the fixture (two hard plates), expose about half of the nib 1, set a pressure displacement distance (0.81mm) on the pressure block in the longitudinal direction (along the nib 1 to the handle 2 and parallel to the axial direction of the handle 2), and then record the hardness (N). The test technical solution of the present invention is between 11.04N and 13.85N, with an average of 11.978N; the average of the prior art is 9.938N.

[0098] Stiffness range: Simple test method, install the sample of the embodiment refill in the fixture (two hard plates), expose about half of the pen tip 1, set a pressing displacement distance (0.20mm) on the cutting board in the horizontal direction (perpendicular to the axial direction of the handle 2 and perpendicular to the pen tip plane), start pressing, then take out the pen tip, and test the bending angle (stiffness) with a microscope. The test technical solution case of the present invention is 0.42° to 1.56°, with an average of 1.04°; the average of the prior art is 4.39°.

[0099] In summary, the technical solution of the present invention has a smaller porosity, smaller pore size, and smaller particle size in the pen tip, so that the pen core is more wear-resistant, has better ink supply continuity, and absorbs water quickly compared to the prior art, and the pen tip has advantages in hardness, rigidity, and strength.

[0100] Example 5: Reference Figure 7 In this embodiment, based on the above-mentioned embodiment, the connection surface 3 is located on the handle 2, and the depths of the connection surfaces at three points of different handles 2 can be different or the same (not described in detail).

[0101] Example 6: Reference Figures 8 to 9 In this embodiment, based on the above-mentioned embodiment, the connection surface 3 can be located at the head 1 part.

[0102] Example 7: Reference Figure 10 to Figure 11 Based on the above-mentioned embodiment, this embodiment is a conical pen core. Fig.11 In the figure, the connecting surface 3 is located just near the connecting portion where the cross-sectional areas of the two handles 2 and the head 1 are transformed.

[0103] Example 8: Reference Fig.12 In this embodiment, based on the above-mentioned embodiment, the connection surface 3 is located on the handle 2 .

[0104] Example 9: Reference Fig.13 In this embodiment, based on the above-mentioned embodiment, the connection surface 3 is located at the head 1. Although the connection surface 3 is shown as a plane in the drawings, in actual products, irregular surfaces may also appear. That is, the connection surface 3 is a roughly plane or an irregular surface or an obvious particle transition interval. The particle transition interval means an area formed by the interweaving of different powders, but there are corresponding single areas with obvious different powders on both sides of this area.

[0105] Example 10: Reference Figure 14 to Figure 15, at least part of the head 1 is different in color from the handle 2 or the rest of the head 1. That is, in the process of preparing the refill, color is added to the plastic powder raw material with a smaller particle size and sintered into a porous refill product. In this way, the location of the fine-grained plastic powder is indicated by different colors, so that the user can distinguish whether the fine-grained plastic is worn. At the same time, the product of the present invention and other technologies can be distinguished. Of course, the plastic powder raw material with a larger particle size can also be colored. Raw material powders of different particle sizes can also be colored differently. Fig.15 A local electron microscope photograph of the present invention is shown.

[0106] Example 11: Reference Fig.16 A porous material pen core of this embodiment comprises a head 1 and a handle 2 connected thereto, wherein the head 1 and the handle 2 are both composed of porous components; the porous components of the head 1 and the handle 2 have different average pore sizes;

[0107] In the refill of this embodiment, the porous component of the head 1 has a first average pore size, and the porous component of the handle 2 has a second average pore size, and the first average pore size is smaller than the second average pore size; there is no significant boundary surface between the pore size of the head 1 and the pore size of the handle 2. That is, the pore size of the handle 2 is larger than that of the head 1, and the pore size decreases regularly or irregularly along the direction from the handle 2 to the head 1, rather than decreasing like Figure 2 The embodiment shown has a relatively obvious interface between the handle 2 and the head 1 where the particles and / or pore sizes vary significantly.

[0108] The porous components of the head 1 and the handle 2 are made of granular materials of the same specification, so that the various parts of the entire pen core after sintering have approximately the same average particle size. Granular materials of the same specification usually refer to particles of the same size, shape and performance that are produced according to certain standards or specifications. These particles are consistent in material composition, physical and chemical properties, and are suitable for various industrial and scientific research fields. It should be noted that the above particles of the same size, shape and performance, according to common sense in the field, obviously do not mean that every particle is consistent, and should not be interpreted narrowly. For example, the raw material particles used in the sintering process are made from the same production batch of the supplier, rather than a mixture of particles of different manufacturers and different specifications, which should be considered to be of the same specification. For another example, the average particle size of the head 1 after sintering differs from the average particle size of the handle 2 by less than 20%, which should also be considered to be of the same specification. For example Fig.16 The enlarged parts A and B are shown in FIG. 1 . The circles are schematic representations of the granular materials and do not represent that the actual particles are perfect spheres. The spaces between the circles represent the pores, and the method for measuring the pore size of the pores is as described above.

[0109] Preferably, the average particle size of the head 1 differs from the average particle size of the handle 2 by less than 20%. The difference in the above average particle size may also be 19%, 18%, 17%, 16%, 15%, 14%, 13%, 12%, 11%, 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.3%, 0.1%. This embodiment may be an axe-shaped pen tip, a U-shaped pen tip, or a conical pen tip, and no redundant drawings are provided.

[0110] Although the present invention has been described in conjunction with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can implement various changes, substitutions of equivalents and modifications to the subject matter listed here without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope defined by the claims.

Claims

1. A porous material pen core, comprising a head (1) and a handle (2) connected thereto, characterized in that: The head (1) and the handle (2) are both composed of porous components; the porous components of the head (1) and the handle (2) have different average pore sizes; the porous component of the head (1) has a first average pore size, and the porous component of the handle (2) has a second average pore size; the first average pore size is smaller than the second average pore size; the porous components of the head (1) and the handle (2) are made of granular materials of the same specification; the average particle size of the head (1) differs from the average particle size of the handle (2) by less than 20%; there is no significant boundary between the particle size and / or pore size of the head (1) and the handle (2); the porous components of the head (1) and the handle (2) have different porosities; the porous component of the head (1) has a first porosity, and the porous component of the handle (2) has a second porosity; the first porosity is smaller than the second porosity.

2. A porous material pen core according to claim 1, characterized in that: The ratio of the first porosity to the second porosity is 1:1.1 to 1:

40.

3. A porous material pen core according to claim 1, characterized in that: At least a portion of the head (1) is of a different color from the rest of the head.

4. Writing instruments, characterized by: A writing tool made of the porous material pen core according to any one of claims 1 to 3.

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