JPS59129186A - Preparation of porous ink impregnated body and prepared porous ink impregnated body - Google Patents

Abstract

PURPOSE:To obtain an ink impregnated body having numberless fine continuous pores, by a method wherein salt put in a mold is sintered and a molding stock material is poured in the mold in a molten state to be penetrated between salt particles and, after the stock material is solidified, the molded one is taken out to elute said salt. CONSTITUTION:Particles of salt C each with a particle size of 10-300mum are put in a lower mold B provided with air vent orifices 2 and heated at about 800 deg.C for a time sufficient to sinter the same. A molding stock material (e.g., rubber) is poured from above in a molten state (e.g., a solution state) to be penetrated into gaps 10 between particles of the salt sintered body. After the stock material is solidified by the evaporation of the solvent, the molded one is taken out of the mold and the salt therein is eluted to obtain a porous molded body. When synthetic resin is used as the molding stock material, it can be brought to the molten state by melting the same under heating.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a porous ink-impregnated body and a porous ink-impregnated body produced thereby.

Conventionally, when producing a porous ink-impregnated body using synthetic rubber or synthetic resin, the following method has generally been used.

[1] Sintering method In this method, rubber or synthetic resin powder or fine particles are placed in a certain mold, and the powder or f' is heated under pressure. This is a method in which fine particles are sintered to form fine continuous pores between them.

However, this method has the following drawbacks.

That is, ■It is difficult to control the quality of the powder and fine particles that are the raw materials.

■Difficult to maintain molding conditions to produce products of constant quality.

■Sintering and forming takes time and is uneconomical.

■Product lacks strength.

(2) Vulcanization method In this method, all substances that dissolve in water are mixed into the raw rubber, etc., and after vulcanization, the dissolved substances are eluted to form fine continuous pores.

However, this method has the following drawbacks.

■It takes time and effort to mix the water-soluble substances into the raw rubber in advance.■■The above-mentioned mixing process requires a high degree of skill to mix the water-soluble substances uniformly throughout the entire rubber.

Therefore, an object of the present invention is to provide a method for producing a porous ink-impregnated body and an ink-impregnated body that eliminate the above-mentioned drawbacks.

Hereinafter, the content of the present invention will be explained in detail.

First, the manufacturing method, which is one aspect of the present invention, will be explained.

In the drawings, FIG. 1 shows the entire basic structure of the equipment of the present invention.

A shows the entire upper mold.

Although this upper die A is shown in the figure, it has an inverted T-shape and has a press-fitting part a, but it is not limited to this.

The material can be freely selected depending on the material to be molded, but it is generally preferable to use metal, especially carbon steel.

B is the lower mold.

This lower mold B is hollow on the inside, and appropriate four parts 1 are formed on the inside bottom surface as required. Each of these four parts is formed by engraving desired characters, patterns, etc. on the ink-impregnated body.

2 is an air vent hole.

Two air vent holes are formed at the contact points of the lower die B, and in the case shown, three are formed on the bottom surface and two on each side wall. When it is formed on the lower surface, it may be formed at the position shown in the figure, or it may be formed within the four parts 1.

The material of the lower mold B may be freely selected depending on the material to be molded, but it is generally preferable to use metal, particularly carbon steel.

The external dimensions of the press-fitting part a of the upper mold A are almost the same as the inner diameter of the hollow part of the lower mold B, and the upper mold AL:r:i head a is inside the hollow part of the lower mold B. 2. Next, FIG. 2 will be explained.

FIG. 2 is an explanatory diagram of the case where a porous ink-impregnated body is manufactured using the basic structure shown in FIG. 1.

FIG. 2(a) shows a state in which particles of a soluble substance, such as salt C, are housed in the lower mold B in an appropriate amount.

The particle size of the stored salt C is 1 mm or less,
Preferably it is between 10 microns and 300 microns.

Next, the table salt particles in the state shown in Figure 1 were heated to around 60 degrees, changing the point contact to full surface contact and sintering the salt particles. The state is shown enlarged.

A communicating gap 10 is formed between the sintered salt particles C. The size of this gap 100 varies depending on the size of the soluble substance used, but ranges from 5 microns to 40 microns.
It is about 0 micron.

Next, FIG. 3 clearly shows the state in which the molten metal is completely poured into the lower mold B in the state H shown in FIG. 2, and then pressed with the upper mold A.

In the following, a case will be described in which a porous ink-impregnated body is manufactured using various molten metals.

[1] When rubber is used as a raw material (including liquid rubber?)
Synthetic rubber or natural rubber is made into thin plates or thin rods, processed into granules, and then dissolved in a solvent suitable for dissolving rubber, such as methyl ethylnaton and toluene, to form a liquid. It is used as a molten metal. When liquid rubber is used, the entire liquid rubber is used as a molten metal.

This molten metal is poured into the lower mold B and degassed if necessary.
The upper mold A and the lower mold are press-fitted into the circle to gradually infiltrate the molten metal into the gap 10 communicating between the sintered salt C. In this state? The diagram is shown in FIG. 2H.

If necessary, remove air from the air vent hole 2 of the lower mold B to reduce the pressure inside the lower mold B to prevent molten metal from entering. help.

If the molten metal penetrates into the gaps 10 of the salt C, the solvent will be volatilized and only the raw rubber will remain in the gaps 10. The ink-impregnated material is manufactured by leaving the remaining parts. FIG. 2(E) shows this state in an enlarged manner.

Next, the upper mold A and the lower mold B'ft in the state shown in Fig. 2)
: The raw material rubber D in the gaps 10 of the sintered salt is vulcanized by heating to produce an ink-impregnated body material.

The vulcanization temperature is 100 to 200 degrees, and the time is 15
30 minutes.

After vulcanization is completed, the ink-impregnated body material is left in the state shown in Figure 2) without completely separating the upper mold A and the lower mold B! ! , or upper mold A is completely separated from lower mold B, and all of the ink-impregnated material is removed from lower mold B, and this is placed in hot water (20 to 60 degrees Celsius) to completely dissolve out the salt. The entire ink-impregnated material after the salt D' has been eluted in this manner is as shown in an enlarged view in FIG.

As shown there, the raw rubber D' is integrally bonded by being vulcanized, while the salt C is partially removed.
When the salt C is eluted, a space is formed there,
These spaces communicate with each other and become ink flow holes 11,
A porous ink-impregnated body made of rubber is formed in which the ink flow holes 11 are formed throughout.

In addition, as shown in FIG.
Salt and molten metal also enter the 0 portion, and convex portions corresponding to the four portions 1 are integrally formed on the surface of the porous ink-impregnated body.

Therefore, in this case, the porous ink-impregnated body E has convex character portions 12 formed on its surface as shown in FIG. 2(G).

The user impregnates this printed body with ink, and when using it as a hand stamp, stores it in a suitable grip and uses it for stamping.

The above explanation is for manufacturing printed matter, but
When manufacturing rollers or stamp bodies for stamp pads?
When manufacturing, it is possible to use exactly the same manufacturing method even when manufacturing a pen core for a writing instrument.・ [2] When thermoplastic synthetic resin is used Even when thermoplastic synthetic resin is used, basically the above [1]
A porous ink-impregnated body is manufactured by the method described in ].

However, in this case, the following points need to be kept in mind.

That is, since the raw material is a thermoplastic synthetic resin, in order to make it into a molten state, the raw material must be heated to the melting temperature of the raw material resin.

If necessary, a plasticizer may be used simultaneously with heating, or a method may be used in which all solvents are used together.

The molten metal used here is sintered salt C shown in Figure 2 (b).
After entering the gap 10, the molten metal D (in this case, it is not made of thermoplastic synthetic resin) is integrally bonded to each other to form an ink-impregnated body material. All you need to do is recover all the solvent and cool the molten metal.

After that, all of the salt is eluted by washing with water, creating a continuous gap in that area, and ink is applied to this gap. It is impregnated and used for various purposes.

As the thermoplastic synthetic resin used here, basically any synthetic resin having plasticity may be used, but boria heptatal resin, polypropylene resin, polyethylene resin, etc. are particularly used.

Even when using this method, in order to form characters, patterns, etc. on the surface of the ink-impregnated material made of thermoplastic synthetic resin, four parts are formed on the bottom surface of the lower mold B or the lower surface of the upper mold A. Correspondingly, characters, patterns, etc. are formed on the surface of the ink-impregnated material. Is this a roller? When manufacturing a stamp pad 'f! : When manufacturing, the exact same manufacturing method is used when manufacturing all pen refills for writing instruments.

[3] When a thermosetting resin is used as a raw material When a thermosetting resin is used as a raw material, both are used in an initial condensed state.

Hardener if necessary? use

The raw materials used include phenolic resin, melamine resin, and polyester resin.

Hereinafter, a case where a phenol resin is used will be explained.

First, if necessary, a curing agent is completely added to an initial condensate of a phenol resin to form a molten metal.

This is poured into the lower mold B in the state shown in FIG.
infiltrate into.

In this case, upper type A? It is pressed from above to completely prevent the molten metal 10 from penetrating, and if necessary, the air 7 is evacuated from the air vent hole 2 of the lower die B to prevent the molten metal from penetrating into the gap 10.

Next, after all the air contained in the molten metal is defoamed, both the upper mold and the lower mold are heated to cause reaction and hardening.

Subsequently, by washing with water, the entire ink-impregnated body material made of phenol resin is formed by draining off all the salt.

This is impregnated with ink and used as a porous ink-impregnated body.

The same manufacturing method is used regardless of whether the entire roller is manufactured, a stamp pad for a stamp stand is manufactured, or a pen core for a writing instrument is manufactured.

As mentioned above, the porous ink-impregnated body formed by the manufacturing method explained above has letters and characters on the upper or lower mold in advance.
It is also possible to form a pattern etc. on the ink-impregnated body material and form characters on its surface.
When forming the entire ink-impregnated material using the above method, it is also possible to form a flat ink-impregnated material and then, if necessary, engrave the entire surface of the ink-impregnated material using an engraving machine or the like to engrave letters, patterns, etc. .

As described above, in the present invention, a raw material in a molten state is injected into the gaps formed between salt particles in a sintered state, heated or cooled as necessary, and then all of the salt is washed out to form countless fine particles. Compared to conventional manufacturing methods, the ink-impregnated material is completely formed and impregnated with ink to create a porous ink-impregnated material.
The manufacturing process is simple and large-scale production is possible in a short period of time, and since the salt is uniformly dispersed, there is an advantage that a porous ink-impregnated body having a certain quality can be obtained.

Also, is the porosity the degree of sintering of salt? 60 by adjusting
-90% can be arbitrarily selected, and there is an advantage that the pore size and pore shape can be freely changed by simply selecting all the salt particle sizes.

Furthermore, the produced porous ink-containing body is strong;
It is ideal for use as printing bodies, rollers, typefaces, pen cores, etc.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an upper mold and a lower mold 7. FIG. 2(A) is a diagram showing a state in which salt is put into the lower mold. Figure 2 (b) is a cross-sectional view of sintered salt. FIGS. 2(c), 2(c), 2(e) and 2(f) are explanatory diagrams showing the molding state. FIG. 2(G) is a perspective view showing the manufactured printed body. Above Figure 1 Figure 2 (D) (Book) (B)
(Ha)!

Claims (2)

[Claims] (1) Place all of the salt in the lower mold, heat it and sinter it to form gaps between the salt particles, while the raw material remains in a molten state. A method for manufacturing a porous ink-impregnated body having numerous fine continuous pores by infiltrating the above-mentioned common salt into the gaps, completely solidifying the raw material by cooling or heating, and then allowing the salt to completely flow out. (2) Store salt in the lower mold, completely heat the salt and sinter it to form all the gaps between the salt particles, while the raw material in molten state penetrates into the gaps of the salt and cools. Or, after heating to solidify the raw material, drain out all the salt, 5 +
A porous ink-impregnated body having a countless number of continuous pores arbitrarily selected between 1 and 90%.