阅读说明：本技术 一种多孔体 (Porous body ) 是由 不公告发明人 于 2018-06-06 设计创作，主要内容包括：本发明涉及一种多孔体,包括缓冲部、集液部和设置在缓冲部和集液部之间的递减毛细部,递减毛细部的上升毛细压从集液部到缓冲部递减,缓冲部的上升毛细压为集液部的上升毛细压的20％到80％。应用本发明多孔体的涂写工具,可以方便使用者观察涂写液量,提高用户体验,且可以有效地防止异常状况下漏墨。(The invention relates to a porous body, which comprises a buffer part, a liquid collecting part and a decreasing capillary part arranged between the buffer part and the liquid collecting part, wherein the rising capillary pressure of the decreasing capillary part decreases from the liquid collecting part to the buffer part, and the rising capillary pressure of the buffer part is 20-80% of the rising capillary pressure of the liquid collecting part. The application of the porous body painting tool can facilitate a user to observe the painting liquid amount, improve the user experience and effectively prevent ink leakage under abnormal conditions.)

1. A porous body comprising a buffer portion, a liquid-collecting portion, and a decreasing capillary portion provided between the buffer portion and the liquid-collecting portion, wherein an increasing capillary pressure of the decreasing capillary portion decreases from the liquid-collecting portion to the buffer portion, and an increasing capillary pressure of the buffer portion is 20% to 80% of an increasing capillary pressure of the liquid-collecting portion.

2. The porous body of claim 1, wherein the cross-sectional area of the descending wick that borders the liquid collection portion is 10% -65% of the cross-sectional area of the descending wick that borders the buffer portion.

3. The porous body according to claim 1, wherein the liquid-collecting portion has a density of 0.08 to 0.5g/cc, and the buffer portion has a density of 0.03 to 0.25 g/cc.

4. The porous body according to claim 1, further comprising a porous-body accommodating chamber, wherein the liquid collecting portion is formed by radially pressing a porous material from outside to inside by the porous-body accommodating chamber.

5. The porous body of claim 1 wherein the porous body is made by filament bonding.

6. The porous body of claim 1, wherein the porous body is made of bonded staple fibers.

7. The porous body of claim 1, wherein the porous body is made with a fiber denier in the range of 0.2 to 30 denier.

8. Porous bodies according to claim 1 wherein the fibrous component from which the porous bodies are made is a mono-component fibre, or a bi-component fibre, or a mixture of mono-component and bi-component fibres.

9. The porous body according to claim 1, wherein a through hole is provided at a radial center of the porous body.

10. The porous body according to claim 1, wherein the liquid collecting portion and the tapered portion are formed by radially pressing a porous material from inside to outside by a gas-liquid exchanger, which is a member for exchanging gas and liquid in a writing instrument.

Technical Field

The invention relates to a porous body, in particular to a porous body in a direct liquid type painting tool in the technical field of painting of writing, cosmetics, correction fluid, liquid glue and the like.

Background

In the painting field, porous materials are widely used, such as in water color pens and eyeliners, as materials for absorbing and containing liquids. In the prior art, the most common porous material is a roll core formed by coating fiber bundles with a film, a penholder is inserted and a coating head is inserted when the roll core is used, and two ends of the roll core are communicated with the atmosphere, so that air is discharged to the two ends when liquid is injected, the liquid is diffused to the two ends, and the liquid is released when coating and writing are also facilitated. However, the liquid output of the coiled core gradually decreases with the increase of the service time, thereby causing the blur of the handwriting, and the coiled core has the defect of large residual liquid amount. For this reason, new writing tools have been studied to overcome the disadvantages of the core wrap as a liquid storage medium.

Patent document (japanese utility model publication No. 56-7504) discloses a direct liquid type writing tool using two porous materials with different porosities as liquid absorbing materials, wherein a second liquid absorbing material receives writing liquid from a liquid supply port at the bottom of a liquid storage tube and supplies the liquid to a writing head, a gas guide tube communicating with the liquid storage tube penetrates the second liquid absorbing material and abuts against the first liquid absorbing material, when the writing liquid is excessive in the second liquid absorbing material, the writing liquid is conducted to the first liquid absorbing material, and the gas guide tube is sealed by liquid after the content of the writing liquid in the first liquid absorbing material is increased, thereby achieving the purpose of automatic liquid supply. The shortcoming of this patent is that can the liquid seal air duct only when first imbibition material absorbs the scribbling liquid of the capacity from the second imbibition material, the scribbling liquid volume that needs in the imbibition material during the liquid seal is big, even not scribble yet, the scribbling liquid volume that leaves in the liquid storage pipe is less, the user can mistake and think scribbling liquid and adorn less, or when can not see scribbling liquid in the liquid storage pipe, although still there are many scribbling liquids in the imbibition material, the user can misunderstanding scribbling liquid and have run out, these two kinds of circumstances lead to poorer user experience.

Disclosure of Invention

In order to solve the problems of the traditional coiled core type painting and writing tool and some past direct liquid type painting and writing tools, the invention provides a porous body which comprises a buffer part, a liquid collecting part and a decreasing capillary part arranged between the buffer part and the liquid collecting part, wherein the rising capillary pressure of the decreasing capillary part decreases from the liquid collecting part to the buffer part, and the rising capillary pressure of the buffer part is 20-80% of the rising capillary pressure of the liquid collecting part.

Furthermore, the cross sectional area of the junction of the tapered capillary part and the liquid collecting part is 10% -65% of the cross sectional area of the junction of the tapered capillary part and the buffer part.

Further, the liquid-collecting portion has a density of 0.08 to 0.5g/cc, and the buffer portion has a density of 0.03 to 0.25 g/cc.

Further, the porous body further includes a porous body accommodating chamber, and the liquid trap portion is formed by radially pressing the porous material from outside to inside by the porous body accommodating chamber.

Further, the porous body is made by bonding filaments.

Further, the porous body is made by bonding short fibers.

Further, the fiber fineness of the porous body is 0.2-30 denier.

Furthermore, the fiber component for preparing the porous body is single-component fiber, or bi-component fiber, or a mixture of the single-component fiber and the bi-component fiber.

Further, the porous body is provided with a through hole at the radial center.

Further, the liquid collecting portion and the tapered capillary portion are formed by radially pressing a porous material from the inside to the outside by a gas-liquid exchanger, wherein the gas-liquid exchanger is a member for exchanging gas and liquid in the painting tool.

According to the technical scheme of the invention, a user can conveniently observe the liquid applying amount, the user experience is improved, and ink leakage under abnormal conditions can be effectively prevented.

Drawings

The following description will explain embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of a writing tool to which a porous body of the present invention is applied according to a first embodiment of the present invention.

Fig. 2 is a schematic structural view of cross sections (cross sections of planes on which the upper end surfaces of the liquid collecting parts are located) of different types of gas-liquid exchangers in a painting and writing tool to which the porous body of the present invention is applied, according to an embodiment of the present invention.

Fig. 3a is a schematic structural diagram of a writing tool using a porous body according to a second embodiment of the present invention.

Fig. 3b is a schematic structural view of a cross section (a cross section of a plane where the upper end surface of the liquid collecting part is located) of a gas-liquid exchanger in a writing instrument using a porous body according to a second embodiment of the present invention.

Fig. 4a is a schematic structural diagram of a writing tool using a porous body according to a third embodiment of the present invention.

Fig. 4b is a schematic structural view of a cross section (a cross section of a plane where the upper end surface of the liquid collecting part is located) of a gas-liquid exchanger in a writing instrument using a porous body according to a third embodiment of the present invention.

FIG. 5a is a schematic structural diagram of a writing tool using a porous body according to a fourth embodiment of the present invention.

Fig. 5b is a schematic structural view of a cross section (a cross section of a plane where the upper end surface of the liquid collecting part is located) of a gas-liquid exchanger in a writing instrument using a porous body according to a fourth embodiment of the present invention.

Fig. 6a is a schematic structural view of a writing tool using a porous body according to a fifth embodiment of the present invention.

Fig. 6b is a schematic structural view of a cross section (a cross section of a plane where the upper end surface of the liquid collecting part is located) of a gas-liquid exchanger in a coating tool to which the porous body of the present invention is applied, according to a fifth embodiment of the present invention.

Fig. 7a is a schematic structural diagram of a writing tool using a porous body according to a sixth embodiment of the present invention.

Fig. 7b is a schematic structural view of a cross section (a cross section of a plane where the upper end surface of the liquid collecting part is located) of a gas-liquid exchanger in a writing instrument to which the porous body of the present invention is applied, according to a sixth embodiment of the present invention.

Fig. 8a is a schematic structural view of a writing tool using a porous body according to a seventh embodiment of the present invention.

Fig. 8b is a schematic structural view of a cross section (a cross section of a plane where the upper end surface of the liquid collecting part is located) of a gas-liquid exchanger in a writing instrument to which the porous body of the present invention is applied, according to a seventh embodiment of the present invention.

Fig. 9 is a schematic structural view of a writing tool to which a porous body of the present invention is applied according to an eighth embodiment of the present invention.

Detailed Description

The following description is given by way of specific embodiments, and the advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. While the invention will be described in conjunction with the preferred embodiments, it is not intended that features of the invention be limited to these embodiments. On the contrary, the invention is described in connection with the embodiments for the purpose of covering alternatives or modifications that may be extended based on the claims of the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The invention may be practiced without these particulars. Moreover, some of the specific details have been left out of the description in order to avoid obscuring or obscuring the focus of the present invention.

The terms "upper", "lower", "front" and "rear" used in the following description should not be construed as limiting the present invention. In the invention, "lower" and "front" refer to one end of the painting and writing head, and "upper" and "rear" refer to one end of the liquid storage tube.

The normal condition or the condition not particularly noted in the present invention generally means a case where the room temperature is a normal atmospheric pressure, and the abnormal condition means a case where the outside temperature or pressure deviates from the normal condition. The rising capillary pressure P in the present invention is defined as the pressure generated by the rising height h of the writing liquid when the porous material (liquid collecting part or buffer part) with sufficient length (generally 5-10cm is required), under normal conditions, one end of the porous material just contacts the level of the horizontal writing liquid and stands vertically for 30 minutes,

P＝ρgh,

Wherein rho is the density of the coating liquid, g is the gravity acceleration, and h is the rising height of the coating liquid

The method for measuring the rise height h of the masking liquid is defined in the invention as follows:

1) Putting the porous material with the length of H into the coating liquid to absorb the liquid until the porous material is saturated, and testing the saturated absorption weight W of the porous material₀，

2) Using the same porous material and the same coating liquid, putting one end of the porous material just contacting the liquid surface of the coating liquid, standing for 30 minutes vertically, testing the liquid absorption weight W,

3) The h value is calculated as: h ═ W/W₀)x H

First embodiment

fig. 1 is a schematic structural view of a writing tool to which a porous body of the present invention is applied according to a first embodiment of the present invention. Referring to FIG. 1, the present embodiment provides an application tool to which the porous body of the present invention is applied, comprising an application head 1; a porous body 2 communicating with the applying head 1, the porous body 2 communicating with the outside atmosphere; a gas-liquid exchanger 3; and a liquid storage pipe 4 communicating with the porous body 2 through the gas-liquid exchanger 3. Wherein, the porous body 2 is provided with a liquid collecting part 22 close to the liquid storage pipe 4, a degressive capillary part 21 arranged below the liquid collecting part 22 and a buffer part 20 arranged below the degressive capillary part 21; the rising capillary pressure of the tapered capillary portion 21 decreases from the liquid collecting portion 22 to the buffer portion 20; the gas-liquid exchanger 3 has an air guide passage 30 and a liquid guide passage 31, and the front end of the air guide passage 30 is disposed between the upper end of the liquid collecting part and the lower end of the tapered capillary part.

The capillary pressure of the buffer part 20 is 20-80% of that of the liquid collecting part 22, and the capacity of the liquid collecting part 22 is 2-25% of that of the liquid storage tube. The front end of the air guide channel 30 is arranged between the upper end of the liquid collecting part and the lower end of the degressive capillary part, and comprises the upper end of the liquid collecting part and the lower end of the degressive capillary part. Preferably, the front end of the air guide passage 30 is disposed at a position between the middle of the liquid collecting part and the middle of the tapered capillary part. This ensures that the porous body has a sufficient capacity for storing the coating liquid, and further ensures that leakage of the coating liquid due to insufficient buffer capacity is prevented in abnormal conditions.

The capillary pressure of the buffer section 20 is 20% to 80% of the capillary pressure of the liquid collecting section 22, and the capillary pressure of the buffer section 20 is, for example, 20%, 30%, 40%, 50%, 60%, 70%, 80% of the capillary pressure of the liquid collecting section 22. When the ratio of the rising capillary pressure of the buffer section 20 to the rising capillary pressure of the liquid collecting section 22 is larger, the coating liquid concentrated in the liquid collecting section 22 is more easily absorbed into the descending capillary section 21 and the buffer section 20. When the ratio of the rising capillary pressure of the buffer section 20 to the rising capillary pressure of the liquid collecting section 22 is smaller, the coating liquid concentrated in the liquid collecting section 22 is more difficult to be absorbed into the descending capillary section 21 and the buffer section 20.

When the ratio of the rising capillary pressure of the buffer section 20 to the rising capillary pressure of the liquid collecting section 22 exceeds 80%, a large amount of the application liquid is absorbed into the descending capillary section 21 and the buffer section 20, resulting in a large decrease in the application liquid in the liquid storage tube, and it is difficult for the user to correctly judge the usage amount of the application liquid. In addition, since the tapered capillary portion 21 and the buffer portion 20 absorb a large amount of the coating liquid under normal conditions, the buffer capacities of the tapered capillary portion 21 and the buffer portion 20 are greatly reduced, and liquid leakage may be caused due to insufficient buffer capacities under abnormal conditions. If the ratio of the increased capillary pressure of the buffer section 20 to the increased capillary pressure of the liquid collecting section 22 is less than 20%, the liquid absorbing ability of the buffer section 20 is too small, and in an abnormal situation, the excess of the coating liquid in the liquid collecting section 22 cannot be sufficiently absorbed by the buffer section 20, resulting in liquid leakage.

The ratio of the capillary pressure increase of the buffer part 20 to the capillary pressure increase of the liquid collecting part 22 in the present embodiment is preferably in the range of 50% to 70%.

The volume of the coating liquid in the liquid collecting part 22 is 2% to 25% of the volume of the reservoir, and for example, the volume of the coating liquid in the liquid collecting part 22 is 2%, 5%, 10%, 15%, 20%, 25% of the volume of the reservoir 4. According to the application tool of the porous body of the present invention, the liquid amount transferred from the liquid storage tube 4 to the liquid collection portion 22 after the application tool of the porous body of the present invention is assembled can be effectively limited, the liquid amount in the liquid storage tube 4 before the application can be no less than 75% of the capacity of the liquid storage tube, the user can observe the application liquid amount conveniently, and the user experience is improved.

After the coating and writing tool using the porous body of the present invention is assembled, the coating and writing liquid in the liquid storage tube 4 is directly or indirectly introduced into the porous body 2 through the liquid guide channel 31 of the gas-liquid exchanger 3, and is concentrated in the liquid collecting part 22 with the highest ascending capillary pressure, meanwhile, negative pressure is gradually formed in the liquid storage tube 4, and air enters the liquid storage tube 4 through the gas guide channel 30 of the gas-liquid exchanger 3. As the amount of the coating liquid in the porous body 2 increases, the coating liquid gradually occupies the capillary space near the front end of the air guide channel 30, the air guide channel 30 is gradually sealed, air no longer enters the liquid storage tube 4, and the coating liquid reaches equilibrium between the liquid storage tube 4 and the porous body 2. When in coating, the coating liquid on the coating writing head 1 is consumed, the liquid guide channel 31, the liquid collecting part 22 or the descending capillary part 21 supplies liquid to the coating writing head 1, the coating liquid amount in the porous body 2 is reduced until the coating liquid in the capillary gap near the front end of the air guide channel 30 is replaced by air, the outside air enters the air guide channel 30 of the gas-liquid exchanger 3 through the air passage in the penholder and the capillary gap without the coating liquid in the porous body 2 and enters the liquid storage tube 4, the negative pressure in the liquid storage tube 4 is reduced, and the coating liquid is guided out from the liquid guide channel 31 and is supplemented to the porous body 2 until the coating liquid in the porous body 2 is increased and the air guide channel 30 is sealed again. This process is repeated until the marking fluid is used up.

The front end of the air guide channel 30 is arranged between the upper end of the liquid collecting part 22 and the lower end of the tapered capillary part 21, the rising capillary pressure of the buffer part 20 is 20-80% of the rising capillary pressure of the liquid collecting part 22, and the writing liquid capacity of the liquid collecting part 22 is 2-25% of the liquid storage tube capacity. Therefore, the coating liquid in the porous body 2 is mainly concentrated in the liquid collecting portion 22 under normal conditions. So that most of the coating liquid, typically 75% or more, remains in the reservoir 4 before it is applied.

In an abnormal condition, such as the liquid storage tube 4 is heated during transportation or use, the air in the liquid storage tube 4 expands and the negative pressure decreases, at this time, the coating liquid in the liquid storage tube 4 is led out to the porous body 2, and under the action of the rising capillary pressure, the coating liquid is absorbed by the liquid collecting part 22, the descending capillary part 21 and the buffer part 20 until the coating liquid is rebalanced between the porous body 2 and the liquid storage tube 4, so that the leakage of the coating liquid from the coating and writing head 1 of the coating and writing tool using the porous body of the present invention can be effectively prevented. When the abnormal condition disappears, the negative pressure in the reservoir 4 increases, and the writing liquid returns from the porous body 2 to the reservoir 4 through the gas-liquid exchanger 3 until the balance between the porous body 2 and the reservoir 4 is restored.

< porous body, buffer section, tapered capillary section, and liquid collecting section >

The porous body 2 of the present invention comprises a buffer 20, a liquid collector 22, and a tapered capillary 21 provided between the buffer 20 and the liquid collector 22, wherein the rising capillary pressure of the tapered capillary 21 decreases from the liquid collector 22 to the buffer 20, and the rising capillary pressure of the buffer 20 is 20% to 80% of the rising capillary pressure of the liquid collector 22.

In the porous body 2 of the present invention, the cross-sectional area of the border between the tapered capillary portion 21 and the liquid collecting portion 22 is 10% to 65%, preferably 25% to 50%, of the cross-sectional area of the border between the tapered capillary portion 21 and the buffer portion 20. The smaller the value, the larger the capillary pressure difference distance between the buffer section 20 and the liquid collecting section 22.

The liquid-collecting portion 22 has a density of 0.08 to 0.5g/cc, the cushioning portion 20 has a density of 0.03 to 0.25g/cc, and g/cc is g/cc. When the density of the cushion portion 20 is less than 0.03, the cushion portion 20 is difficult to mold and difficult to manufacture. When the density of the cushioning portion 20 is greater than 0.25, the liquid absorbing ability of the cushioning portion 20 becomes too strong, so that the amount of ink stored in the cushioning portion 20 becomes too large in a normal state, and the leakage preventing ability of the porous body 2 in an abnormal state is lowered. Preferably 0.06-0.16 g/cc.

The porous body 2 may further include a porous-body housing chamber 5, and the liquid trap portion 22 may be formed by radially pressing the porous material from the outside to the inside from the porous-body housing chamber 5.

The porous body 2 is made by bonding filaments or staple fibers, and the bonding method may be bonding means such as an adhesive or thermal bonding.

The fiber fineness of the porous body 2 is 0.2-30 denier. Denier is the mass in grams of 9000m long fibers at a nominal moisture regain. The fiber fineness of the porous body 2 produced by the present invention is preferably 1.5 to 10 deniers, and most preferably 2 to 6 deniers.

The fibrous component of the porous body 2 is a single-component fiber, or a bicomponent fiber, or a mixture of a single-component fiber and a bicomponent fiber.

The porous body 2 is provided with a through hole at the radial center. The lower end of the porous body, i.e., the lower end of the buffer section 20 in the present invention is open to the atmosphere so as to smoothly perform gas-liquid exchange, and quickly absorb and release the coating liquid. The porous body in the present invention is a porous material made of fibers, and the porous body is made of bonded fibers or unbonded fibers, but may be made of sponge, porous plastic, felt, or the like. Through certain process control, the axial strength of the bonded fiber porous body can be higher than the radial strength, so that the radial compression and the axial assembly are facilitated. Holes may be formed simultaneously with the bonding of the fibers to facilitate the insertion of the gas-liquid exchanger 3 and the applicator head 1.

The porous body 2 comprises a buffer part 20, a descending capillary part 21 and a liquid collecting part 22, and is integrated or separated. The integrated structure is convenient to assemble and low in cost, and the split structure has more choices in material selection of each part.

When the buffer 20 and the tapered capillary portion 21 are integrated, the rising capillary pressure of the buffer 20 is the same as the rising capillary pressure of the lowermost end of the tapered capillary portion 21. When the liquid collecting part 22 and the decreasing capillary part 21 are integrated, the rising capillary pressure of the liquid collecting part 22 is the same as the rising capillary pressure of the uppermost end of the decreasing capillary part 21. When the buffer part 20, the descending capillary part 21 and the liquid collecting part 22 are separated, the ascending capillary pressure of the buffer part 20 and the ascending capillary pressure at the lowest end of the descending capillary part 21 may be the same or different, and the ascending capillary pressure of the liquid collecting part 22 and the ascending capillary pressure at the highest end of the descending capillary part 21 may be the same or different, according to the selection of materials.

The invention can adopt an integrated porous material to radially compress to form the liquid collecting part 22 and the descending capillary part 21, thereby not only meeting the requirement on the ascending capillary pressure, but also reducing parts and being convenient for manufacturing. The rising capillary pressure of the tapered capillary portion 21 is tapered from the top to the bottom, and in this case, the upper half portion of the tapered capillary portion 21 is close to the liquid collecting portion 22, and the lower half portion thereof is close to the buffer portion 20. In this structure, the downward arrangement of the front end of the air guide passage 30 is advantageous for increasing the content of the coating liquid in the porous body 2 and increasing the liquid discharge amount of the coating tool using the porous body of the present invention; the upward arrangement of the front end of the air guide passage 30 is advantageous for reducing the content of the writing liquid in the porous body 2, and for improving the buffer capacity and the leakage prevention capability of the porous body 2 for the writing liquid.

The radial center of the buffer 20, the tapered capillary 21, or the liquid trap 22 may be formed with a through hole to facilitate insertion of the applicator head 1 and the gas-liquid exchanger 3 into the porous body 2 at the time of assembly. When the liquid collecting part 22, the tapered capillary part 21 or the buffer part 20 has a through hole, the above cross-sectional area does not include the cross-sectional area of the hole.

The buffer part 20 has a void volume of 1 to 150% of the volume of the reservoir, preferably 20 to 60% of the volume of the reservoir. The design can reasonably utilize the space in the penholder, and simultaneously ensure that the coating liquid does not leak from the coating head 1 when the temperature and the air pressure of the coating tool applying the porous body change in the transportation and use processes.

< gas-liquid exchanger >

With the porous body painting and writing tool of the present invention, the front end of the air guide channel 30 of the gas-liquid exchanger 3 is disposed between the upper end of the liquid collecting part 22 and the lower end of the tapered capillary part 21. When the front end of the air guide channel 30 is positioned at the lower end of the tapered capillary part 21, the liquid seal of the air guide channel 30 is most difficult to occur, the content of the coating liquid in the porous body 2 is the largest, and the porous body coating tool is suitable for coating tools with large liquid output amount. When the front end of the air guide passage 30 is positioned at the center of the liquid collecting portion 22, the liquid seal of the air guide passage 30 occurs most easily, and the amount of the liquid to be applied to the porous body 2 is minimized, which is suitable for a writing tool to which the porous body of the present invention is applied, in which the amount of the liquid to be applied is small.

When the front end of the air guide channel 30 is set from the lowest end of the decreasing capillary part 21 to the highest end of the decreasing capillary part 21, the amount of liquid required for the front end of the liquid seal air guide channel 30 is gradually reduced in the porous body 2, and the amount of liquid applied to the porous body 2 is reduced, so that the liquid applying tool is suitable for applying liquid applying amounts different from each other. This technique brings additional advantages in that the cross-sectional area decreases towards the upper end of the tapered capillary portion 21: the closer the front end of the air guide passage 30 is to the uppermost end of the tapered capillary portion 21, the more the amount of the coating liquid in the porous body 2 is significantly reduced at the time of gas-liquid equilibrium.

Therefore, in an abnormal situation, if the leading end of the air guide passage 30 is closer to the uppermost end of the tapered capillary portion 21, the more the capacity of the porous body 2 for absorbing the writing liquid increases when the writing liquid in the reservoir 4 is led out from the liquid guide passage 31 due to a temperature rise, thereby significantly improving the capability of preventing the leakage of the writing liquid.

The application of the porous coating tool of the invention, the front end of the liquid guide channel 31 is inserted into the liquid collecting part 22, the descending capillary part 21, the buffer part 20 or the coating and writing head 1, the lower the front end of the liquid guide channel 31 is arranged, the shorter the distance of the coating and writing liquid penetrating into the coating and writing head 1 is, and the faster the liquid supply speed is during coating and writing.

The application of the porous body of the invention can arrange the liquid guide channel 31 in the air guide channel 30, and under the condition, the front end position of the liquid guide channel 31 can be flexibly arranged, for example, the front end of the liquid guide channel 31 abuts against the pen head, so that the distance of the coating liquid transmitted from the front end of the liquid guide channel 31 to the pen head is shortened.

The air guide channel 30 can also be arranged in the liquid guide channel 31 by applying the porous body painting tool of the invention, under the condition, the rear end position of the air guide channel 30 can be flexibly arranged, for example, the rear end of the air guide channel 30 extends into the liquid storage tube 4, and under the condition of higher external negative pressure, when the liquid level in the liquid storage tube 4 is lowered to expose the rear end of the air guide channel 30, air in the liquid storage tube 4 can be led out through the air guide channel 30, so that the leading-out of the painting liquid in the liquid storage tube 4 is further reduced, and the leakage risk is reduced.

The air guide channel 30 and the liquid guide channel 31 can also be arranged in parallel, and the front ends and the rear ends of the air guide channel 30 and the liquid guide channel 31 can be respectively and flexibly arranged so as to meet the use requirements of different application porous body painting and writing tools.

The liquid guide channel 31 can be a hollow pipe, and the structure can quickly discharge liquid, is favorable for increasing the liquid discharge amount, is suitable for the application tool with the porous body of the invention with high liquid discharge amount, and is also suitable for the application liquid containing particles or fragments, such as cosmetic liquid containing particles, liquid chalk application liquid, correction liquid and the like.

The application of the porous body painting tool can lead the liquid channel 31 to be a water diversion core, and the water diversion core has reliable and stable liquid guiding performance and convenient manufacture.

The painting and writing tool with the porous body has the advantages that the liquid guide channel can be a hollow water guide core, the holes in the liquid guide channel are air guide channels, and the structure is simple. A pipe can also be inserted into the hollow water diversion core, the pipe is an air guide channel, and the air guide channel can extend into the liquid storage pipe.

Fig. 2 is some schematic structural diagrams of cross sections (cross sections of planes on which the upper end surfaces of the liquid collecting parts are located) of different types of gas-liquid exchangers in a painting and writing tool applying the porous body provided by the embodiment of the invention. As shown in fig. 2, the gas-liquid exchanger 3 may be structured as a double-tube coaxial passage 2a, and the liquid guide passage 31 is provided in the gas guide passage 30, i.e., the inner tube is formed as the liquid guide passage 31, the annular passage between the inner tube and the outer tube is formed as the gas guide passage 30, and the liquid guide passage 31 is a hollow tube.

The gas-liquid exchanger 3 may be configured as a single-tube double channel 2b, i.e., a single tube is divided into a gas guide channel 30 and a liquid guide channel 31 by a partition plate.

The gas-liquid exchanger 3 may be constructed as a single-tube water-introducing core 2c with the liquid-guiding passage 31 provided in the gas-guiding passage 30, i.e., the liquid-guiding passage 31 is a water-introducing core, and an annular passage between the water-introducing core and the outer tube is formed as the gas-guiding passage 30.

The gas-liquid exchanger 3 may be a single-tube grooved wick 2d, i.e., a wick in a single tube is formed as a liquid guide channel 31, and a channel formed by grooving the wall surface of the wick is formed as a gas guide channel 30.

The gas-liquid exchanger 3 may also be constructed as a double-tube coaxial channel 2e, which differs from the construction of 2a in that the gas-conducting channel 30 is arranged in a liquid-conducting channel 31, i.e. the inner tube is formed as a gas-conducting channel 30 and the annular channel between the inner and outer tubes is formed as a liquid-conducting channel 31, in which case the rear end of the gas-conducting channel 30 may extend into the reservoir 4 beyond the liquid level in the reservoir, the liquid-conducting channel 31 being a hollow annular tube.

The gas-liquid exchanger 3 may be structured as a hollow water guide core 2f, and the air guide passage 30 is provided in the liquid guide passage 31, i.e., the hole in the water guide core is formed as the air guide passage 30.

The gas-liquid exchanger 3 may have any of the above-described structures, or may have other structures having similar functions.

The liquid guide passage 31 is provided in the gas guide passage 30. This structure enhances the strength of the gas-liquid exchanger 3 while saving the volume of the gas-liquid exchanger 3, and the gas-liquid exchanger 3 occupies a small space proportion in the porous body 2, which is also advantageous for inserting the porous body 2 and reducing the damage to the porous body 2, and is very easy to assemble even in a pen barrel with a small inner diameter.

In the coating and writing tool using the porous body of the present invention, the gas guide passage 30 of the gas-liquid exchanger 3 is one or more. The number and size of the air guide channels 30 and the relative positions of the air guide channels and the liquid guide channels can be flexibly set according to the requirement of the liquid outlet amount and the size of the internal space of the penholder, which is another advantage of the invention.

in the application of the porous body painting tool of the present invention, the front end of the liquid guide passage 31 or the air guide passage 30 may be formed in a sharp shape to facilitate insertion of the porous body 2.

The gas guide channel 30 and the liquid guide channel 31 in the gas-liquid exchanger 3 are combined together, and the gas-liquid exchanger 3 is positioned at the radial center of the porous body 2 or the liquid guide channel is positioned at the radial center of the porous body 2, so that the distance of the coating liquid transferred to the coating head 1 is short, the coating is smoother, and the manufacturing is easier. And is advantageous for improving the strength of the gas-liquid exchanger 3, facilitating the assembly of the applicator using the porous body of the present invention, and making the applicator using the porous body of the present invention very easy even if the inner diameter of the barrel is small.

< coating write head >

The coating and writing tool applying the porous body of the invention has the advantages that the coating and writing head 1 is a part for writing or coating liquid, and the rear end of the coating and writing head 1 can be inserted into the buffer part 20, the tapered capillary part 21 and the liquid collecting part 22. When the rear end of the painting and writing head 1 is inserted into the liquid collecting part 22, the painting and writing head 1 is in full contact with the liquid collecting part 22, and the liquid supply speed and reliability are improved.

By applying the coating and writing tool with the porous body, the front end of the liquid guide channel 31 can pass through the porous body 2 and abut against the rear end of the coating and writing head 1, and the length of the coating and writing head 1 is short under the condition, so that the cost of the coating and writing head is reduced.

In the coating tool using the porous body of the present invention, the porous material of the porous body 2 is arranged between the front end of the liquid guide channel 31 and the rear end of the coating and writing head 1. When some coating liquid is unstable and easy to precipitate, and the coating head is easy to be blocked by the precipitate, the porous material between the front end of the liquid guide channel 31 and the coating head 1 can filter the precipitate, and the precipitate is prevented from blocking the coating head 1.

< liquid storage pipe >

In the painting tool applying the porous body, the liquid storage pipe 4 is a component for filling the painting liquid, and the replaceable liquid storage pipe 4 can be adopted, so that the repeated utilization of components such as a penholder 6 and the like is facilitated, and the resource waste is reduced. The replaceable liquid storage tube 4 can be connected to the upper part of the penholder 6 of the painting tool applying the porous body of the invention by adopting various modes such as screw connection, clamping connection and the like.

< Pen shaft >

the painting and writing tool using the porous body of the present invention in this embodiment further includes a pen holder 6, and the upper portion of the pen holder 6 may be integrally formed with the liquid storage tube 4, or may be detachably connected to the liquid storage tube 4.

The lower portion of the barrel 6 may be integrally provided with a head holder 10 to which the head 1 is mounted, and the head holder 10 may be separately formed and then detachably mounted to the lower portion of the barrel 6.

The upper portion of the barrel 6 may be integrally provided with a partition 61, or a separately formed partition 61 may be detachably mounted. The gas-liquid exchanger may be integrally provided on the partition plate 61, or may be separately formed and then detachably mounted on the partition plate 61.

< porous body accommodating Chamber >

The porous body applying coating tool in this embodiment of the invention further includes a porous body accommodating chamber 5, and the whole or at least the liquid collecting section 22 of the porous body 2 is installed in the porous body accommodating chamber 5. The shaped porous body accommodating chamber 5 allows the porous body 2 to be easily shaped to form the tapered capillary portion 21 and the liquid collecting portion 22 in appropriate shapes. That is, the liquid trap portion 22 and the tapered capillary portion 21 may be formed by radially pressing the porous body from the outside to the inside of the porous body accommodating chamber.

When the buffer part 20 or the liquid collecting part 22 and the tapered capillary part 21 are of a split structure, the porous body accommodating chamber 5 facilitates close contact between the materials, so that liquid can smoothly circulate between the parts.

With the porous body coating tool of the present invention, the liquid trap portion 22 and the tapered capillary portion 21 are shaped into a desired shape when the porous body 2 is mounted to the porous body accommodating chamber 5. In this case, a porous material having a uniform density in the top and bottom before installation is selected, and the porous material is molded into the porous body 2 having a desired shape by using the shape of the porous-body accommodating chamber 5 during installation, so that the production and the manufacture are convenient and the cost is low.

Compared with the prior art, the coating tool applying the porous body has the advantages of smooth coating, difficult night leakage, less residual liquid amount, simple structure, easy manufacture, and convenient observation of the coating liquid amount in the liquid storage pipe by a user, and can be widely applied to the requirements of different types of coating tools on the liquid outlet amount and the type of the coating liquid.

Second embodiment

As shown in fig. 3a and 3b, the structure of this embodiment is similar to that of the first embodiment, and the parts that are the same as those of the first embodiment are not described again in the description of this embodiment. The difference is that the liquid collecting part 22 of the present embodiment is formed by radially pressing the integral porous material from the outside to the inside of the porous body accommodating chamber 5 integrally formed with the partition plate, and the tapered capillary part 21 is formed accordingly. The capillary pressure of the buffer section 20 is 60% of the capillary pressure of the liquid collecting section 22; the cross-sectional area of the liquid collecting part 22 was 35% of the cross-sectional area of the buffer part 20, and the capacity of the liquid collecting part 22 for the coating liquid was 10% of the capacity of the liquid storage tube. The front end of the air guide channel 30 is arranged at the lower end of the liquid collecting part 22, the liquid guide channel 31 is a water guide core clamped in the air guide channel 30 through a reinforcing rib 32, and the front end of the liquid guide channel is arranged at the lower end of the buffer part 20 and abuts against the rear end of the painting and writing head 1. The capillary void volume of the buffer portion 20 is 50% of the volume of the reservoir tube.

This example is suitable for medium-volume applicators, such as water color pens, to which the porous bodies of the present invention are applied. After the coating and writing tool using the porous body of the present invention is assembled, the coating and writing liquid in the liquid storage tube 4 is introduced into the porous body 2 through the liquid guide channel 31 and is concentrated on the upper portions of the liquid collecting portion 22 and the tapered capillary portion 21, and meanwhile, negative pressure is gradually formed in the liquid storage tube 4, and air enters the liquid storage tube 4 through the air guide channel 30. As the writing liquid in the porous body 2 increases and occupies the capillary space near the front end of the air guide channel 30, the air guide channel 30 is sealed with liquid, air no longer enters the liquid storage tube 4, and the writing liquid reaches equilibrium between the liquid storage tube 4 and the porous body 2. When the amount of liquid in the porous body 2 is reduced, the painting liquid in the capillary gap near the front end of the air guide channel 30 is replaced by air, the outside air enters the air guide channel 30 through the air passage in the penholder 6 and the capillary gap without the painting liquid in the porous body 2 and finally enters the liquid storage tube 4, the negative pressure in the liquid storage tube 4 is reduced, and the painting liquid is guided out from the liquid guide channel 31 and is supplemented to the porous body 2 until the painting liquid in the porous body 2 is increased and the air guide channel 30 is sealed by the liquid again. This process is repeated until the marking fluid is written.

In an abnormal condition, if the liquid storage tube 4 is heated during transportation, the air in the liquid storage tube 4 expands and the negative pressure decreases, at this time, the coating liquid in the liquid storage tube 4 is led out to the liquid collecting part 22 and is transferred to the descending capillary part 21 and the buffer part 20, and the coating liquid is absorbed by the porous body 2 until the coating liquid is rebalanced between the porous body 2 and the liquid storage tube 4, so that the leakage of the coating liquid from the coating and writing head 1 of the coating and writing tool using the porous body of the present invention can be effectively prevented. When the above abnormal condition disappears, the negative pressure in the reservoir 4 increases, and the coating liquid in the porous body 2 returns to the reservoir 4 through the gas-liquid exchanger 3 until the balance between the porous body 2 and the reservoir 4 is restored.

In this embodiment, setting the leading end position of the air guide passage downward increases the amount of the coating liquid in the porous body 2, that is, increases the amount of the liquid discharged from the coating head.

Third embodiment

As shown in FIGS. 4a and 4b, this embodiment has a structure similar to that of the first embodiment, but the liquid guiding channel 31 is a hollow tube, the front end of which is located at the middle lower part of the tapered capillary part 21 and abuts against the rear end of the pen point; the front end of the air guide channel 30 is positioned in the middle of the decreasing capillary part 21. The liquid collecting part 22 and the decreasing capillary part 21 are integrated, the buffer part 20 is a separate body, and the rising capillary pressure of the buffer part 20 is 80% of the rising capillary pressure of the liquid collecting part 22. Each porous-body portion is located in the porous-body accommodating chamber 5; the cross-sectional area of the liquid collecting part 22 is 65% of the cross-sectional area of the buffer part 20, the coating liquid capacity of the liquid collecting part 22 is 15% of the capacity of the liquid storage pipe, and the capillary void volume of the buffer part 20 is 60% of the capacity of the liquid storage pipe.

Fourth embodiment

As shown in fig. 5a and 5b, this embodiment is similar to the first embodiment, but the liquid guide channel 31 is a water-guiding core installed in a concave groove of the plastic tube 33, the plastic tube 33 and the concave groove of the water-guiding core form the air guide channel 30, and the front end of the plastic tube 33 is located at the front end position of the air guide channel 30, in this embodiment, the front end of the air guide channel 30 is located at the middle of the liquid collector 22, and the front end of the liquid guide channel 31 is located at the lower end of the liquid collector 22. The porous body 2 is a one-piece porous material, and the tapered capillary portion 21 and the liquid collecting portion 22 are located in the porous-body accommodating chamber 5. The buffer part 20 is 70% of the capillary pressure of the liquid collecting part 22; the cross-sectional area of the liquid collecting part 22 is 50% of the cross-sectional area of the buffer part 20, the capacity of the liquid collecting part 22 for the coating liquid is 10% of the capacity of the liquid storage tube, and the capillary void volume of the buffer part 20 is 70% of the volume of the liquid storage tube. The liquid storage pipe 4, the partition plate 61 and the plastic pipe 33 wrapping the water diversion core are independently and integrally formed, and modular assembly is facilitated. The trailing end of the applicator head 1 is adjacent the lower end of the sump portion 22. The structure is beneficial to the coating of viscous coating liquid, such as eyeliner, liquid glue and the like.

Fifth embodiment

As shown in fig. 6a and 6b, the present embodiment is similar to the first embodiment, except that the liquid collecting part 22 of the present embodiment is a separate body, and the rest parts are integrated; the tapered capillary portion 21 and the liquid collecting portion 22 are located in the porous-body accommodating chamber 5. The capillary pressure of the buffer section 20 is 20% of the capillary pressure of the liquid collecting section 22, the cross-sectional area of the liquid collecting section 22 is 10% of the cross-sectional area of the buffer section 20, the capacity of the liquid collecting section 22 is 2% of the capacity of the liquid storage tube, and the capillary void volume of the buffer section 20 is 150% of the volume of the liquid storage tube. The front end of the air guide channel 30 is arranged at the lower end of the tapered capillary part 21, and the liquid guide channel 31 is a water guide core, and the front end of the water guide channel penetrates through the porous body 2 and is inserted into the painting and writing head 1. The rear ends of the air guide channel 30 and the liquid guide channel 31 are clamped with the liquid storage pipe 4.

The embodiment is suitable for painting tools with large ink output quantity, such as writing brushes for calligraphy and painting. This embodiment adopts alternate form liquid storage tube, can reuse parts such as penholder, saves use cost.

Sixth embodiment

As shown in fig. 7a and 7b, the present embodiment is similar to the first embodiment, but the air guide channel 30 and the liquid guide channel 31 adopt a parallel structure, the lower end of the air guide channel 30 abuts against the upper end of the liquid collecting part 22, the lower end of the liquid guide channel 31 is located in the middle of the liquid collecting part 22, the rising capillary pressure of the buffer part 20 is 50% of the rising capillary pressure of the liquid collecting part 22, the cross-sectional area of the liquid collecting part 22 is 25% of the cross-sectional area of the buffer part 20, the capacity of the liquid coating liquid of the liquid collecting part 22 is 25% of the capacity of the liquid storage tube, the capillary void volume of the buffer part 20 is 1% of the capacity of the liquid storage tube, the absorbent part 23 is provided above the porous body 2, and the rising capillary pressure of the absorbent. The buffer portion 20, the tapered capillary portion 21, and the liquid collecting portion 22 are an integral porous material, and are located in the porous-body accommodating chamber 5.

As shown in fig. 7a, the rear end of the air guide channel 30 can be extended into the liquid storage tube 4, and when the liquid level in the liquid storage tube 4 drops to expose the rear end of the air guide channel 30 under the condition of high external negative pressure, air in the liquid storage tube 4 can be led out through the air guide channel 30, so that the leading-out of the painting liquid in the liquid storage tube 4 is reduced, and the leakage risk is further reduced. The gas-guiding passage 30 and the liquid-guiding passage 31 in the gas-liquid exchanger 3 are juxtaposed, and the gas-liquid exchanger 3 may be located at the radial center of the porous body 2, or the liquid-guiding passage 31 of the gas-liquid exchanger 3 may be located at the radial center of the porous body 2. The working principle of the embodiment is similar to that of the embodiment 3, and the juxtaposition of the liquid guide channel 31 and the air guide channel 30 is particularly suitable for the elliptic penholder.

Seventh embodiment

As shown in fig. 8, the present embodiment is a modification of the first embodiment. The same parts as those of the first embodiment will not be described again in the description of this embodiment. The difference is that the gas-liquid exchanger 3 includes an outer tube 32 and an inner tube 33, and the front ends of the outer tube 32 and the inner tube 33 are located at the lower end of the liquid collecting portion 22; a liquid guide channel 31 is formed between the outer pipe 32 and the inner pipe 33 through arranging a hollow water guide core, the channel in the inner pipe 33 forms an air guide channel 30, the rear end of the inner pipe 33 extends into the liquid storage pipe 4 and preferentially extends to the middle upper part of the liquid storage pipe 4, namely the rear end of the air guide channel 30 is positioned at the middle upper part of the liquid storage pipe 4. The rear end of the pen point is close to the front end of the liquid guide channel 31, and the outer tube 32 and the partition plate 61 are integrally arranged.

The buffer section 20, the tapered capillary section 21, and the liquid collecting section 22 are separate bodies, and each part is located in the porous body accommodating chamber 5. The capillary pressure of the buffer section 20 is 50% of the capillary pressure of the liquid collecting section 22; the cross-sectional area of the liquid collecting part 22 is 20% of the cross-sectional area of the buffer part 20; the capacity of the coating liquid in the liquid collecting part 22 is 5% of the capacity of the liquid storage pipe; the capillary void volume of the buffer portion 20 is 20% of the volume of the reservoir tube. The air in the liquid storage pipe can be discharged through the air guide channel when the air is arranged at high negative pressure outside, so that the leakage prevention capability can be further improved.

Eighth embodiment

As shown in fig. 9, the present embodiment is a modification of the first embodiment. The same parts as those of the first embodiment will not be described again in the description of this embodiment. The difference is that the barrel 6 in this embodiment also serves as a porous body housing chamber, and the gas-liquid exchanger 3 is made conical at the lower part, so that the porous material is radially pressed from the inside to the outside to form the liquid collecting part 22 and the tapered capillary part 21. The gas-liquid exchanger 3 is provided with a slot or hole on the side wall in the liquid collecting part 22 or the descending capillary part 21 to form an air guide channel 30. The front end of a liquid guide channel 31 in the gas-liquid exchanger 3 passes through the porous body 2 to be communicated with the coating head 1, and the coating head 1 is indirectly communicated with the porous body 2 through the liquid guide channel 31; the capacity of the liquid collecting section 22 for the coating liquid is 5% of the capacity of the liquid storage tube. The capillary pressure of the buffer section 20 was 60% of the capillary pressure of the liquid collecting section 22, the cross-sectional area of the liquid collecting section 22 was 35% of the cross-sectional area of the buffer section 20, and the capillary void volume of the buffer section 20 was 80% of the volume of the liquid reservoir.

The liquid guide channel 31 can directly supply ink to the coating head, and coating fluency is improved. In an abnormal condition, such as the liquid storage tube 4 is heated during transportation, the air in the liquid storage tube 4 expands and the negative pressure decreases, and at this time, the coating liquid in the liquid storage tube 4 is guided out to the porous body 2 through the peripheral surface of the liquid guide channel 31 until the coating liquid is rebalanced between the porous body 2 and the liquid storage tube 4, so that the leakage of the coating liquid from the coating head 1 can be effectively prevented. When the above abnormal condition disappears, the negative pressure in the reservoir 4 increases, and the writing liquid in the porous body 2 returns to the reservoir 4 until the balance between the porous body 2 and the reservoir 4 is restored. The embodiment is suitable for various writing instruments, such as white board pens, marking pens, gel pens, correction pens, liquid chalks, liquid glue writing devices, eyeliner pens, sign pens and the like.

The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention. The painting and writing tools to which the porous body of the present invention is applied broadly refer to tools for writing and painting in office supplies, and various liquid painting tools used in the fields of cosmetics, correction fluids, liquid glues, and the like.