JPS6144676B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a writing instrument for office use, a writing instrument for writing,
The present invention relates to an improvement in a method for producing a porous pen core pre-impregnated with ink, which is suitable as a dotting tool for dot-type printers, a pen core for various recording devices, and the like.

Porous pen cores pre-impregnated with ink are used as the cores of water-based pens, felt-tip pens, and simple brushes. Conventionally, these were mainly made of rubber or plastic, so they lacked wear resistance and durability. It had drawbacks in terms of solvent properties, dimensional stability, etc., and had the disadvantage of causing clogging. For this purpose, it would be sufficient to make it from porous metal, but since the porous metal used for oil-impregnated bearings is made by sintering metal powder, it has a low pore occupation rate and a rough surface. It is unsuitable for use as a writing instrument.

In contrast, in this invention, when easily water-soluble salt particles are sintered in a compressed state, the gaps between the particles connected to each other by sintering are connected to the outside by the discharge of vaporized gas. Focusing on the point where a series of microscopic gaps are created, this sintered body is used as an inner mold for precision casting using the same metal as die casting, and then the easily water-soluble salt portion of the inner mold is removed to form the required porous metal body. It was designed to obtain the following.

The order of manufacturing a porous pen core according to the method of the present invention will be explained using an example in which common salt is used as the easily water-soluble salt and aluminum is used as the metal. Fill with sorted salt particles.

(2) The salt particles are heated together with the mold at a predetermined temperature to create a series of fine gaps that connect the original interparticle gaps between the particles and open to the outer surface at a volume ratio of 40 to 80% of the total.

(3) Molten aluminum is press-fitted into the heated mold, permeates into the fine gaps, and then cooled.

(4) Take out a lump of penetrating metal and salt particles from the mold, and cut it into a required rod shape as necessary.

(5) The whole is washed, and the salt particles that are in contact with each other are sequentially eluted and removed from the outside, forming continuous pores.

(6) This is impregnated with ink either entirely or only at the tip.

The present invention has been explained above using common salt as the easily water-soluble salt and aluminum as the metal, but other easily water-soluble salts include stannous chloride, zinc chloride,
cupric chloride, magnesium chloride, potassium chloride,
Barium chloride, magnesium sulfate, potassium phosphate, and metals such as tin, bismuth, zinc,
lead, aluminum, antimony, magnesium,
Silver, iron, gold, manganese, beryllium and alloys thereof can each be used.

The porous pen core obtained by the method of this invention has fine continuous pores with a pore size in the range of 30 to 500μ and a total volume of the pores accounting for 40 to 80% of the total volume of the rod. . Since it is made as a metal body with continuous pores, which are the most suitable dimensions for ink retention rate, continuous ink oozing rate, and strength of the pen core itself, it does not run out of ink and is resistant to wear. It has excellent properties and can be used as a copying pen, and is also suitable as an industrial writing tool and a carpenter's corner marker.

FIG. 1 shows a type of brush in which the tip part and the shaft part are made integrally, which can be obtained by the method of the present invention.After the integral rod-shaped main body 1 is impregnated with ink, the shaft part 2 is coated with an appropriate coating. has been applied. Note that by engraving characters on the rear end surface of the shaft portion 2 and using the ink-impregnated portion as that for the tip portion, it is also possible to use the writing instrument as a stamp-printing instrument.

FIG. 2 shows a type in which ink is contained within the shaft, and is formed by inserting and fixing a rod-shaped main body 1 into a separately manufactured shaft 2. Fig. 3 shows that a separate auxiliary metal body 1' with a slightly larger continuous pore size is enclosed inside the rod-shaped main body 1 in order to increase the ink holding power in order to improve the abrasion resistance. It is composed of In this case, felt, synthetic fiber, etc. can also be used instead of the auxiliary metal body.

Furthermore, FIG. 4 shows a porous pen core in which the rod-shaped main body is composed of two types of porous materials with different pore sizes. That is, the tip 3 of this rod-shaped main body 1 has fine continuous pores, and the rear end 4
has coarse continuous pores.

For example, when using salt particles as easily water-soluble salt, such a rod-shaped main body is formed by first filling a mold with salt particles with a particle size of 6 to 100 μm, and then placing salt particles with a particle size of 10 to 500 μm on top of the mold. It is manufactured by sintering a material filled with particles and then performing the same treatment as described above.

FIG. 5 shows an example in which the porous bubbles constituting the rod-shaped main body 1 gradually become larger from the front end 3 to the rear end 4. As shown in FIG.

Such a rod-shaped body is produced by filling a mold with salt particles with a particle size ranging from 5 to 300μ, then vibrating the mold for a predetermined period of time, and moving from the bottom of the mold to the top, from small to large particles. It can be manufactured by sequentially arranging and sintering, and then performing the same treatment as described above.

According to the method of the present invention, as described above, a pen core that can supply ink to the tip of the brush more smoothly than a conventional porous pen core, and that can also be used as a hard writing instrument itself, can be obtained. If cutting of a lump consisting of molten metal and easily water-soluble salt particles is required, this process is performed prior to the cleaning and removal process of the easily water-soluble salt to prevent pores from collapsing or deforming during cutting. This has the advantage that it can be prevented, and that it can also prevent the pores from being blocked by cutting debris.

[Brief explanation of the drawing]

The drawings show various examples of pen cores obtained by the method of this invention. Figure 1 is a perspective view of an example in which the tip and shaft are made integrally, and Figure 2 is a pen core with ink built into the shaft. Figure 3 is a cross-sectional view of an example of a pen nib with a double structure, and Figures 4 and 5 are cross-sectional views of an example of a pen nib made of porous metal with different pore sizes. It is a diagram. In the figure, 1 is a rod-shaped main body, 2 is a shaft portion, and 1' is an auxiliary metal body.

Claims (1)

[Claims] 1 Fill a mold with easily water-soluble salt particles with a particle size of 5 to 60μ, then heat the mold together to sinter the easily water-soluble salt so that the particles are in contact with each particle and communicate with each other. After forming a microscopic gap that opens to the outside, molten metal is press-fitted into the mold to penetrate into the microscopic gap, and after cooling, it is cut into the required rod shape as necessary, and then cleaned. A method for producing a porous pen core, which comprises removing easily water-soluble salt particles to form a metal porous rod having fine continuous pores, and impregnating the rod with ink.