Porous material-based pen refill

Abstract

Disclosed in the present invention is a porous material-based pen refill, comprising a head part and a handle part connected to the head part, wherein the head part and the handle part are both made of porous members. The head part is a part close to a writing end, and the handle part is a part connected to a pen tube and used for suctioning ink. The present invention has the advantages of smooth writing, continuous ink supply, uniform color development, toughness and durability.

Description

A porous material refill TECHNICAL FIELD

[0001] The present invention relates to the field of fluent writing refills, and in particular to a porous material refill. BACKGROUND

[0002] The nibs of writing instruments such as paint markers, underlining markers, etc. are widely used because they can draw wide lines due to the wide refill they have, and because of their excellent visibility and workability. In the case of the nibs of writing instruments such as line markers, writing is generally possible by applying capillary action to a porous member, which is a member in which synthetic resin fibers, etc. are gathered into a rod shape, etc., a sintered body of a polymer, etc., to guide ink supplied from a rod body, which is the main body of the writing instrument, to the nib. The porous plastic structure, including the writing nib, is generally manufactured by sintering together particles of a thermoplastic material.

[0003] Prior art such as CN112533765B describes a writing instrument, the nib of which is a nib having a refill containing a shielding material, the brightness in the L*a*b*(CIE LAB) colorimetric system of the refill being 80 or more. As the writing instrument, it includes a holding body having, for example, a visible portion that can visually confirm the writing direction, and a nib of the above structure mounted to the holding body. US20220041006A1 also discloses a nib and related writing instrument, the nib having a nib housing including a flexible upper writing portion and a lower portion in communication with the flexible upper writing portion. The lower portion of the nib housing is configured to deliver ink to the flexible upper writing portion, and the flexible upper writing portion is configured to deliver ink to a writing surface. The flexible upper writing portion of the nib cartridge includes a flat chisel-shaped tip at an upper end of the flexible upper writing portion. The nib can effectively deliver ink to a writing surface when a force of less than about 0.1 lbs is applied.

[0004] JP7420905B2 also discloses a writing instrument, the porosity of the refill of which is 30-70%. The writing instrument ink composition contains coloring resin particles having an average particle diameter of 1-10 μm. The ink viscosity is 8 to 20 mPa-s, and the particle size distribution (Mv / Mn) of the coloring resin particles is 1-3.

[0005] US3942903A discloses a monolithic porous thermoplastic writing nib, which provides a porous thermoplastic product having a uniform pore size and an improved writing nib. The above prior art is all single material technology. SUMMARY

[0006] The present application aims at providing a porous material refill with fluent writing, continuous ink supply, uniform color development, and strong durability in view of the prior art.

[0007] The present application solves the above technical problems by employing the technical solution of a porous material refill comprising a head portion and a handle portion connected thereto, wherein: the head portion and the handle portion are both porous members. The head portion refers to the part near the writing end, while the handle portion refers to the part connected to the pen tube and absorbing ink. The above naming is only for the convenience of indicating the relative position of the refill, so as to facilitate understanding and reading. The head portion and the handle portion cannot be considered as two independent components.

[0008] To optimize the above technical solution, the following measures are also taken: the porous members of the head portion and the handle portion have different average pore sizes.

[0009] Preferably, the porous member of the head portion has a first average pore size, and the porous member of the handle portion has a second average pore size; the first pore size is less than or equal to the second average pore size.

[0010] Preferably, the ratio of the first average pore size to the second average pore size is 1:5 to 1:50.

[0011] Preferably, the ratio of the first average pore size to the second average pore size is 1:1 to 1:4.999.

[0012] Preferably, the average pore size of the porous member of the head portion is 1 µm to 300 µm, and the average pore size of the porous member of the handle portion is 5 µm to 300 µm. The porous material refill with different properties is made of sintered porous polymer particles through a sintering process. The refill is formed by one-time heating sintering. The refill provides a comfortable writing experience and good writing effect. In general refills, the handle portion and the head portion have the same material properties, such as pore size, porosity, flow rate, and capillary force. In the embodiments of the present application, two types or more of 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 portion is larger than that of the head portion. The porous members of the head portion and the handle portion have different average particle sizes.

[0013] Preferably, the porous member of the head portion has a first average particle size, and the porous member of the handle portion has a second average particle size; the first particle size is less than or equal to the second average particle size.

[0014] Preferably, the ratio of the first average particle size to the second average particle size is 1:2 to 1:60.

[0015] Preferably, the ratio of the first average particle size to the second average particle size is 1:1 to 1:1.999.

[0016] Preferably, the average particle size of the porous member of the head is from 3 pm to 900 pm; the average particle size of the porous member of the shaft is from 6 pm to 990 pm;

[0017] Preferably, the particles of the head have a different particle size distribution from the particles of the shaft. The shaft of the refill is required to have a high flow rate and low capillary force, which enables the liquid to be drawn from the reservoir to the head of the refill. While the head of the refill is designed to have a lower liquid flow rate but with a higher capillary force, the purpose of this design is to enable a smooth flow of liquid from the shaft of the refill to the writing surface, and to provide a comfortable writing experience and good writing results. This refill design allows the capillary force to move the liquid from the reservoir into the shaft, through the shaft to the head, and for the head to contact the writing surface. The porous members of the head and the shaft have different porosities;

[0018] Preferably, the porous member of the head has a first porosity, and the porous member of the shaft has a second porosity; the first porosity is less than or equal to the second porosity;

[0019] Preferably, the ratio of the first porosity: the second porosity is from 1 : 1.1 to 1 :40;

[0020] Preferably, the ratio of the first porosity: the second porosity is from 1 : 1 to 1 : 1.109;

[0021] Preferably, the porosity of the porous member of the head is from 2.5% to 90%; the porosity of the porous member of the shaft is from 5% to 78%;

[0022] Preferably, the head and the shaft have different stiffnesses;

[0023] Preferably, the head and the shaft have different colors;

[0024] Preferably, the porous members of the head and the shaft have different capillary forces, and the capillary force of the head is greater than that of the shaft. The flow rate of the head is lower than that of the shaft. The shaft of the refill is required to have a high flow rate and low capillary force, which enables the liquid to be drawn from the reservoir to the head of the refill. While the head of the refill is designed to have a lower liquid flow rate but with a higher capillary force, the purpose of this design is to enable a smooth flow of liquid from the shaft of the refill to the writing surface, and to provide a comfortable writing experience and good writing results. This refill design allows the capillary force to move the liquid from the reservoir into the shaft, through the shaft to the head, and for the head to contact the writing surface. 5. A porous material refill, characterized by: being composed of a porous member. The porous member has at least one abutment surface;

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

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

[0027] Preferably, the two sides of the interface have different average pore sizes 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 than the j-th segment near the handle; and / or,

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

[0030] different average pore sizes; and / or,

[0031] different capillary forces; wherein n is a natural number less than 100, i < n and j < n. A specific measurement method is as follows: the refill body is divided into equal n segments along the ink flow direction, for example n = 5. Among them, the 1st segment contains the writing surface contact end of the refill head, and so on, the 5th segment contains the handle end. Under this definition, the average pore size of the 2nd segment (i.e. i = 2) and the 4th segment (i.e. j = 4) are compared to determine 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, polyether sulfone, polystyrene, polyetherimide, polyether ether ketone, or polysulfone, and combinations and / or copolymers thereof;

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

[0035] Preferably, at least part of the average pore size near the writing end of the porous body is smaller than the average pore size 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 than the powder of the handle formed by the porous body. The particle size distribution is measured by Mv / Mn.

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

[0038] The head refers to the part near the writing end, and the handle refers to the part connected with the pen tube and absorbing ink. Thus, the application has the advantages of fluent writing, continuous ink supply, uniform color development, and strong durability. BRIEF DESCRIPTION OF DRAWINGS

[0039] Fig. 1 is a schematic diagram of the main structure of the refill of the embodiment 1 of the application;

[0040] Fig. 2 is a schematic diagram of the cross-sectional structure of the refill of the embodiment 1 of the application;

[0041] Fig. 3 is a schematic diagram of the cross-sectional structure of the refill of the embodiment 2 of the application;

[0042] Fig. 4 is a schematic diagram of the cross-sectional structure of the refill of the embodiment 3 of the application;

[0043] Fig. 5 is a schematic diagram of the main structure of the refill of the embodiment 4 of the application;

[0044] Fig. 6 is a schematic diagram of the cross-sectional structure of the refill of the embodiment 4 of the application;

[0045] Fig. 7 is a schematic diagram of the cross-sectional structure of the refill of the embodiment 5 of the application;

[0046] Fig. 8 is a schematic diagram of the cross-sectional structure of the refill of the embodiment 6 of the application;

[0047] Fig. 9 is an enlarged schematic diagram of part of the structure of the embodiment 6 of the application;

[0048] Fig. 10 is a schematic diagram of the main structure of the refill of the embodiment 10 of the application;

[0049] Fig. 11 is a schematic diagram of the cross-sectional structure of the refill of the embodiment 10 of the application;

[0050] Fig. 12 is a schematic diagram of the cross-sectional structure of the refill of the embodiment 11 of the application;

[0051] Fig. 13 is a schematic diagram of the cross-sectional structure of the refill of the embodiment 12 of the application;

[0052] Fig. 14 is a photograph of the embodiment 13 of the application;

[0053] Fig. 15 is an electron microscope photograph of the embodiment 13 of the application. Embodiment of the application

[0054] The application will be further described in detail below in combination with the accompanying embodiments.

[0055] Reference signs: head 1, handle 2, and abutment surface 3.

[0056] Embodiment 1 : With reference to Figures 1 to 4, a porous material refill comprising a head 1 and a shank 2 connected thereto, wherein: the head 1 and the shank 2 are each formed of a porous structure; the head 1 refers to the portion of the refill closest to the writing end, and the shank 2 refers to the portion of the refill connected to the barrel of the pen and which absorbs the ink.

[0057] The porous structures of the head 1 and the shank 2 have different average pore sizes;

[0058] Preferably, the porous structure of the head 1 has a first average pore size and the porous structure of the shank 2 has a second average pore size; the first average pore size is less than or equal to the second average pore size;

[0059] Preferably, the ratio of the first average pore size: second average pore size is between 1 :5 and 1 :50; as a preference, the ratio of the first average pore size: second average pore size also includes: 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 :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.

[0060] Preferably, the ratio of the first average pore size: second average pore size is between 1 :1 and 1 :4.999; as a preference, the ratio of the first average pore size: 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.

[0061] Preferably, the average pore size of the porous member of the head 1 is from 1 pm to 300 pm; the average pore size of the porous member of the shaft 2 is from 5 pm to 300 pm. As a preference, the average pore size of the porous member of the head 1 and the average pore size of the porous member of the shaft 2 is 5 pm, 10 pm, 15 pm, 20 pm, 25 pm, 30 pm, 35 pm, 40 pm, 45 pm, 50 pm, 55 pm, 60 pm, 65 pm, 70 pm, 75 pm, 80 pm, 85 pm, 90 pm, 95 pm, 100 pm, 105 pm, 110 pm, 115 pm, 120 pm, 125 pm, 130 pm, 135 pm, 140 pm, 145 pm, 150 pm, 155 pm, 160 pm, 165 pm, 170 pm, 175 pm, 180 pm, 185 pm, 190 pm, 195 pm, 200 pm, 205 pm, 210 pm, 215 pm, 220 pm, 225 pm, 230 pm, 235 pm, 240 pm, 245 pm, 250 pm, 255 pm, 260 pm, 265 pm, 270 pm, 275 pm, 280 pm, 285 pm, 290 pm, 295 pm. The average pore size of the porous member of the head 1 can also be 2 pm, 3 pm, 4 pm.

[0062] The porous material refill with different properties is made from sintered porous polymer particles by a sintering process. The refill is formed by one heating sintering. The refill provides a comfortable writing experience and good writing effect. In a general refill, the refill is composed of a shaft 2 and a head 1 with the same material properties, such as pore size, porosity, flow rate and capillary force. In the embodiment of the present application, two or more types of performance materials are used in a single refill, which has different properties of lower pore size and higher pore size, for example, the pore size of the shaft is larger than the pore size of the head. The porous member of the head 1 and the shaft 2 has different average particle sizes;

[0063] Preferably, the porous member of the head 1 has a first average particle size, and the porous member of the shaft 2 has a second average particle size; the first average particle size is less than or equal to the second average particle size;

[0064] Preferably, the ratio of the first average particle size : second average particle size is in the range of 1 :2 to 1 :60; as preferred, the ratio of the first average particle size : second average particle size further comprises: 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, 1 :56, 1 :57, 1 :58, 1 :59.

[0065] Preferably, the ratio of the first average particle size : second average particle size is in the range of 1 :1 to 1 :1.999. As preferred, the ratio of the first average particle size : second average particle size further comprises: 1 :15, 1 :20, 1 :25, 1 :30, 1 :35, 1 :40, 1 :45, 1 :50, 1 :55, 1 :60, 1 :65, 1 :70, 1 :75, 1 :80, 1 :85, 1 :90, 1 :95.

[0066] Preferably, the average particle size of the porous structure of the head 1 is from 3 pm to 900 pm; the average particle size of the porous structure of the stem 2 is from 6 pm to 990 pm; as a preference, the average particle size of the porous structure of the head 1 and the average particle size of the porous structure of the stem 2 further comprise: 7 pm, 8 pm, 9 pm, 10 pm, 11 pm, 12 pm, 13 pm, 14 pm, 15 pm, 16 pm, 17 pm, 18 pm, 19 pm, 20 pm, 25 pm, 30 pm, 35 pm, 40 pm, 45 pm, 50 pm, 55 pm, 60 pm, 65 pm, 70 pm, 75 pm, 80 pm, 85 pm, 90 pm, 95 pm, 100 pm, 105 pm, 110 pm, 115 pm, 120 pm, 125 pm, 130 pm, 135 pm, 140 pm, 145 pm, 150 pm, 160 pm, 170 pm, 180 pm, 190 pm, 200 pm, 210 pm, 220 pm, 230 pm, 240 pm, 250 pm, 260 pm, 270 pm, 280 pm, 290 pm, 300 pm, 310 pm, 320 pm, 330 pm, 340 pm, 350 pm, 360 pm, 370 pm, 380 pm, 390 pm, 400 pm, 410 pm, 420 pm, 430 pm, 440 pm, 450 pm, 460 pm, 470 pm, 480 pm, 490 pm, 500 pm, 510 pm, 520 pm, 530 pm, 540 pm, 550 pm, 560 pm, 570 pm, 580 pm, 590 pm, 600 pm, 610 pm, 620 pm, 630 pm, 640 pm, 650 pm, 660 pm, 670 pm, 680 pm, 690 pm, 700 pm, 710 pm, 720 pm, 730 pm, 740 pm, 750 pm, 760 pm, 770 pm, 780 pm, 790 pm, 800 pm, 810 pm, 820 pm, 830 pm, 840 pm, 850 pm, 860 pm, 870 pm, 880 pm, 890 pm, 900 pm, 910 pm, 920 pm, 930 pm, 940 pm, 950 pm, 960 pm, 970 pm, 980 pm. The average particle size of the porous structure of the head 1 can also be 4 pm, 5 pm, 6 pm.

[0067] Preferably, the porous structure of the head 1 has a first porosity and the porous structure of the shaft 2 has a second porosity; the first porosity is less than or equal to the second porosity;

[0068] Preferably, the porous structure of the head 1 has a first porosity and the porous structure of the shaft 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: second porosity is 1 : 1.1 to 1 : 40; as a preference, the ratio of the first porosity: 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: second porosity is 1 : 1 to 1 : 1.109;

[0071] Preferably, the porosity of the porous member of the head 1 is between 2.5% and 90%; the porosity of the porous member of the shaft 2 is between 5% and 78%; as a preference, the porosity of the porous member of the head 1 and the porosity of the porous member of the shaft 2 further comprise: 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 shaft 2 have different stiffnesses;

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

[0074] Preferably, the porous members of the head 1 and the shaft 2 have different capillary forces, the capillary force of the head 1 is greater than the capillary force of the shaft 2. The flow rate of the head 1 is lower than the flow rate of the shaft 2. The shaft of the refill is required to have a high flow rate and a low capillary force, which enables the liquid to be sucked from the reservoir to the head of the refill. While 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 smoothly flow the liquid from the shaft of the refill to the writing surface and provide a comfortable writing experience and good writing effect. This design of the refill allows the capillary force to move the liquid from the reservoir to the shaft, through the shaft to the head, so that the head contacts the writing surface. A porous material refill is composed of a porous member. The porous member has at least one abutment surface 3;

[0075] Preferably, the two sides of the abutment surface have different porosities;

[0076] Preferably, the two sides of the abutment surface have different average particle sizes;

[0077] Preferably, the two sides of the abutment surface have different average pore sizes and / or capillary forces;

[0078] Preferably, in the n segments of the body of the refill, the i-th segment close to the head 1 has a different porosity compared to the j-th segment close to the shaft 2; and / or,

[0079] has a different average particle size; and / or,

[0080] has a different average pore size; and / or,

[0081] have different capillary forces; wherein n is a natural number less than 100, i < n and j < n. A specific measurement method is as follows: the refill body is divided into equal n sections along the ink flow direction, for example n = 5. Among them, the first section contains the writing surface contact end of the refill head 1, and so on, the fifth section contains the handle end. Under this definition, the average pore diameter of the second section (i = 2) and the fourth section (j = 4) is compared to determine whether they are the same or different.

[0082] A porous material refill is made of a porous body sintered from a plastic powder. The plastic includes polyolefin, polyamide, polyester, rigid polyurethane, polyacrylonitrile, polycarbonate, polyvinyl chloride, polymethyl methacrylate, polyvinylidene fluoride, polytetrafluoroethylene, polyether sulfone, polystyrene, polyetherimide, polyether ether ketone, or polysulfone, and combinations and / or copolymers thereof;

[0083] Preferably, the plastic powder of the head 1 and the plastic powder of the handle 2 have different particle size distributions. The particle size distribution is measured by Mv / Mn.

[0084] A writing instrument made of a porous material refill. That is, a pen made of a porous material according to the technical solutions of the present application.

[0085] In the present application, the porosity is calculated as follows: first, immerse the refill or refill segment (for example, separate the refill into a head and a handle) with a known mass and apparent volume in water, and after the water is fully infiltrated, measure the mass in the state after being taken out of the water. From the measured mass, the volume of water infiltrated into the refill is derived. The volume of water is considered to be the same as the pore volume of the refill, and the porosity is calculated by the following formula A.

[0086] Porosity (unit %) = (volume of water) / (apparent volume of refill) x 100 (Formula A)

[0087] In the present application, "average particle size" refers to the average value of the diameter of a particle measured by an electron microscope, which is the average value of the particle size measured for 20 particles projected into the image of the electron microscope. In the case of a non-circular particle, the length of the longest line segment and the length of the shortest line segment connecting any two points of the outline forming the pore are added and divided by 2, and the resulting value is taken as the particle size of the particle.

[0088] The present application selects an axe-shaped refill, a U-shaped refill, and a conical refill as typical examples for further description. In this embodiment, an axe-shaped refill is taken as an example, and in FIG. 2, the abutment surface 3 is located at the connection between the head 1 and the handle 2. As a writing instrument, the handle 2 part is located inside the pen barrel or ink capsule and in contact with the ink.

[0089] Embodiment 2: Referring to Fig. 3, this embodiment is based on the previous embodiment, and the interface 3 is located in the part of the head 1.

[0090] Embodiment 3: Referring to Fig. 4, this embodiment is based on the previous embodiment, and the interface 3 is located in the part of the handle 2.

[0091] Embodiment 4: Referring to Figs. 5-6, this embodiment is based on the previous embodiment, and it is a U-shaped refill. In Fig. 6, the interface 3 is located just near the connection part of the two handles 2 and the head 1. The technical solution of the U-shaped refill has two handles 2 and a head 1 connected across the top ends of the two handles 2 to form an entire U-shaped refill.

[0092] Embodiment 5: Referring to Fig. 7, this embodiment is based on the previous embodiment, and the interface 3 is located in the handle 2, and the interface 3 point positions of different handles 2 can be different or the same (not described again).

[0093] Embodiment 6: Referring to Figs. 8-9, this embodiment is based on the previous embodiment, and the interface 3 can be located in the part of the head 1.

[0094] Embodiment 10: Referring to Figs. 10-11, this embodiment is based on the previous embodiment, and it is a conical refill. In Fig. 11, the interface 3 is located just near the connection part of the two handles 2 and the head 1.

[0095] Embodiment 11: Referring to Fig. 12, this embodiment is based on the previous embodiment, and the interface 3 is located in the handle 2.

[0096] Embodiment 12: Referring to Fig. 13, this embodiment is based on the previous embodiment, and the interface 3 is located in the part of the head 1. Although the interface 3 is shown as a flat surface in the drawing, in actual products, it can also be an irregular surface. That is, the interface 3 is a generally flat surface or an irregular surface or a clear granular transition zone. The granular transition zone means a region formed by the interweaving of different powders, but on both sides of this region there are clear corresponding single regions formed by different powders.

[0097] Embodiment 13: Referring to Figs. 14-15, the head 1 has at least part of the color different from that of the handle 2. That is, during the preparation of the refill, the plastic powder raw material with a smaller particle size is colored and sintered into a porous body of the finished refill. In this way, the position of the fine particle plastic powder is indicated by the different colors, so that the user can distinguish whether the fine particle plastic is worn out. At the same time, it can also distinguish the products of the present application from other technologies. Of course, the plastic powder raw material with a larger particle size can also be colored. Different particle size raw material powders can also be colored differently. Fig. 15 shows a partial electron microscope photo of the present application.

[0098] While the application has been described in connection with the preferred embodiments, it will be understood that the application is not limited to the preferred embodiments, and that various changes, modifications and substitutions can be made by those skilled in the art without departing from the spirit and scope of the application, and that such changes, modifications and substitutions are intended to fall within the scope of the appended claims.

Claims

1. A porous material refill comprising a head (1) and a shank (2) connected thereto, characterized in that: The head (1) and the handle (2) are both porous members.

2. A porous material refill according to claim 1, characterized in that: The porous members of the head (1) and the handle (2) have different average pore sizes; And / or, the porous member of the head (1) has a first average pore size, and the porous member 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; And / or, the ratio of the first average pore size: the second average pore size is 1:5 to 1:50; And / or, the ratio of the first average pore size: the second average pore size is 1:1 to 1:4.

999. And / or, the average pore size of the porous member of the head (1) is 1 µm to 300 µm; the average pore size of the porous member of the handle (2) is 5 µm to 300 µm.

3. A porous material refill according to claim 1, characterized in that: The porous members of the head (1) and the handle (2) have different average particle sizes; And / or, the porous member of the head (1) has a first average particle size, and the porous member 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; And / or, the ratio of the first average particle size: the second average particle size is 1:2 to 1:60; And / or, the ratio of the first average particle size: the second average particle size is 1:1 to 1:1.

999. And / or, the average particle size of the porous member of the head (1) is 3 µm to 900 µm; the average particle size of the porous member of the handle (2) is 6 µm to 990 µm; And / or, the particles of the head (1) and the particles of the handle (2) have different particle size distributions.

4. A porous material refill according to claim 1, characterized by: The porous members of the head (1) and the handle (2) have different porosities; And / or, the porous member of the head (1) has a first porosity, and the porous member of the handle (2) has a second porosity; the first porosity is less than or equal to the second porosity; And / or, the ratio of the first porosity: the second porosity is 1:1.1 to 1:40; And / or, the ratio of the first porosity: the second porosity is 1:1 to 1:1.

109. And / or, the porosity of the porous member of the head (1) is 2.5% to 90%; the porosity of the porous member of the handle (2) is 5% to 78%; And / or, the head (1) and the handle (2) have different rigidities; And / or, at least part of the head (1) has a color different from that of the handle (2); And / or, the porous members of the head (1) and the handle (2) have different capillary forces, and the capillary force of the head (1) is greater than that of the handle (2).

5. A porous material refill characterized by: The head (1) and the handle (2) are both porous members.

6. A porous material refill according to claim 5, characterized in that: The porous member has at least one abutment surface (3); And / or, the two sides of the abutment surface have different porosities; And / or, the two sides of the abutment surface have different average particle sizes; And / or, the two sides of the abutment surface have different average pore sizes and / or capillary forces; And / or, In the n segments of the refill body, the i-th segment near the head (1) has different porosity compared with the j-th segment near the handle (2); and / or, has different average particle size; and / or, has different average pore size; and / or, has different capillary force; wherein n is a natural number less than 100, i < n and j < n.

7. A porous material refill characterized by: The refill is made of a porous body sintered from plastic powder.

8. A porous material refill according to claim 1, characterized by: The plastic includes polyolefin, polyamide, polyester, rigid polyurethane, polyacrylonitrile, polycarbonate, polyvinyl chloride, polymethyl methacrylate, polyvinylidene fluoride, polytetrafluoroethylene, polyether sulfone, polystyrene, polyetherimide, polyether ether ketone or polysulfone and combinations and / or copolymers thereof; and / or, the plastic powder of the head (1) made of the porous body has different particle size distribution compared with the plastic powder of the handle (2) made of the porous body; and / or, at least part of the porosity near the writing end of the porous body is less than the porosity near the ink absorbing end of the porous body; and / or, 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 absorbing end of the porous body; and / or, at least part of the average pore size near the writing end of the porous body is less than the average pore size near the ink absorbing end of the porous body.

9. A writing instrument characterised in that: The writing instrument is made of the porous material refill as claimed in any one of claims 1 to 8.

Images