JPS60112497A - Porous pen lead and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a porous pen core pre-impregnated with ink, which is suitable as a writing instrument for office use, a writing instrument for scribing, a dotting tool for dot-type printers, a pen core for various recording devices, etc. It is related to.

Porous pen cores pre-impregnated with ink are used as the cores of water-based pens, felt-tip pens, and simple brush pens. Conventionally, these pens were mainly made of rubber or plastic, so they lacked wear resistance and acid resistance. There were problems in terms of agent properties, dimensional stability, etc., and there were disadvantages such as clogging. For this purpose, it would be better to make it from porous metal,
Porous metals used in oil-impregnated bearings and the like are made by sintering metal powder, so they have a low pore occupancy and a rough surface, making them unsuitable for writing instruments.

On the other hand, in this invention, when easily water-soluble salt particles are sintered in a compressed state, the gaps between the particles connected integrally due to sintering are connected by the discharge of vaporized gas, and the external space is formed. 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 a metal similar to die casting.Then, the water-soluble salt portion of the inner mold is removed to form the required porous metal. It was designed to help you gain a body.

The order in which the porous pen core of the present invention is manufactured is explained using common salt as the easily water-soluble salt and aluminum 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 gaps between the particles and open to the outer surface, with 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 in contact with each other are sequentially eluted and removed from the outside to form 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 an easily water-soluble salt and aluminum as a metal, but other easily water-soluble salts include stannous chloride and zinc chloride.

Cupric chloride, magnesium chloride, potassium chloride, barium chloride, magnesium sulfate, phosphorus-potassium, and metals such as tin, bismuth, and zinc.

Lead, aluminum, antimony, magnesium.

Silver, iron, gold, manganese, beryllium and alloys thereof can each be used.

The porous pen core of the present invention has the above-mentioned structure, and is made as a metal body with continuous pores that are the most suitable size for ink retention, continuous ink penetration, and strength of the pen core itself. Because of this, it does not run out of ink, has excellent abrasion resistance, 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 portion and the shaft portion are made integrally, and after the integral rod-shaped main body 1 is impregnated with ink, the shaft portion 2 is coated with an appropriate coating.

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 in 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, Fell F, synthetic fiber, etc. can also be used in place of the auxiliary metal body.

In addition, Figure 4 shows that the rod-shaped main body has two different pore sizes.
This figure shows a porous pen nib made of porous material. 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.

Such a rod-shaped main body is 1. For example, if salt particles are used as easily water-soluble salt, first the particle size is 6 to 100 in the mold.
After filling μ salt particles, the particle size lO~50
It is manufactured by sintering a product filled with 0 μm salt 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 main body is produced by filling a mold with salt particles having a particle size of 5 to 300μ, and then vibrating the mold for a predetermined period of time.
The particles can be manufactured by sintering the particles after arranging them in order from the bottom to the top of the mold from the smallest particle size to the largest particle size, and then performing the same process as described above.

As explained above, this invention not only allows ink to be smoothly supplied to the tip of the brush compared to conventional porous pen cores, but also
It has many advantages such as the pen core itself can be used as a hard writing instrument.

In this invention, when cutting of a lump consisting of molten metal and easily water-soluble salt particles is required during manufacturing, the process is performed prior to the washing and removal process of the easily water-soluble salt, so that pores are eliminated during cutting. It has the advantage of being able to prevent crushing and deformation, and also preventing the pores from being blocked by cutting debris.

[Brief explanation of the drawing]

The drawings show various examples of the pen core according to the present invention, and FIG. 1 is a perspective view of an example in which the tip and shaft are made integrally,
Figure 2 is a cross-sectional view of an example in which ink is built into the shaft, Figure 3 is a cross-sectional view of an example in which the pen core has a double structure, and Figures 4 and 5 are porous metals with different pore sizes. It is a sectional view of an example of the pen core constituted by. In the figure, numeral 1 is a rod-shaped main body, 2 is a shaft portion, and 1' is an auxiliary metal body. Patent applicant Hirobe Yoda, Director of the Agency of Industrial Science and Technology (and one other person) Sub-agent Akira Agata 7- Figure 1 Figure 3 Figure 4 Figure 5 Figure 11

Claims (1)

[Scope of Claims] 1. The core part to be connected to the brush tip part or the core part made integrally with the brush cleaning part is constituted as a metal porous rod-shaped body having substantially uniform pores as a whole, and the pores are made large. Saga 30～
A porous pen core characterized in that it has fine continuous pores in the range of 500μ and the total volume of the pores occupies 40 to 80V of the total volume of the rod-shaped body. 2 Fill the mold with easily water-soluble salt particles with a particle size of 5 to 60μ,
The mold is then heated to sinter the easily water-soluble salt, forming fine gaps between the particles that contact each particle and communicate with each other to open to the outside.The mold is then filled with molten metal. After cooling, the material is press-fitted to infiltrate into the microscopic gaps, and after cooling, the material is cut into the required rod shape as required, and then washed to remove easily water-soluble salt particles, resulting in a metal porous rod shape with fine continuous pores. A method for producing a porous pen core, which comprises forming a core and impregnating it with ink.