JPS612590A - Porous ink pad and manufacture thereof - Google Patents

Abstract

PURPOSE:To markedly enhance clearness of printed images, durability of a pad itself or the like, by providing open micropores having a size of 30-500mum such that the total volume of the micropores is 40-80% of the total volume of the entire body of a metallic porous body. CONSTITUTION:A metallic mold having an appropriate shape is charged with sodium chloride particles selected to have a particle size of 30-500mum. The particles are heated to a predetermined temperature together with the mold to obtain a fired body in which gaps between the particles are connected with each other to form a series of minute gaps opened to the outside surface in a total volume of 40-80% of the volume of the entire body. A melt of aluminumor zinc is poured into the heated mold under pressure to infiltrate the molten metal into the minute gaps, followed by cooling. The lump form body consisting of the metal and the sodium chloride particles is demolded, and is finished by cutting into a predetermined flat plate form 1 or a roll form. The body thus obtained is entirely washed to sequentially dissolve away the contiguous sodium chloride particles, starting from the outer ones, whereby open pores are formed. The body thus obtained is impregnated with an ink to obtain an article.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink pad for applying ink to the surface of a stamp, an ink roller for applying ink to typewriter type, and an ink pad installed in industrial printing equipment. The invention relates to an improved ink pad used to deposit ink on stamp surfaces and printing plate surfaces.

Porous ink pads are usually made of rubber, plastic, etc., but they have drawbacks in terms of wear resistance, solvent resistance, dimensional stability, etc., and have the disadvantage of causing clogging. For this purpose, it would be sufficient to make it from porous metal, but the porous metal used in oil-impregnated bearings and the like is made by sintering metal powder.

It has a low pore occupancy and a rough surface, making it unsuitable for ink application.

In contrast, in this invention, when easily water-soluble salt particles are sintered in a compressed state, voids are formed between the particles that are integrally connected by sintering, which facilitates the discharge of vaporized gas. Focusing on the point where a series of micro gaps are created that lead to the outside, this sintered body is made into an inner mold and precision cast using a metal similar to die casting, and then the easily water-soluble ring part of the inner mold is removed. This is to obtain the required porous metal body.

The order of manufacturing the porous ink pad of the present invention is explained by using common salt as the easily water-soluble salt and aluminum as the metal as an example.
It is filled with salt particles sorted to a size in the 500μ range.

(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 or molten zinc 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, cut it into the required flat plate shape or roll shape, and finish it.

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

(6) This is impregnated with ink to form a product.

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

The porous ink pad of the present invention is made as described above, i.e., the entire porous ink pad is 30 to
Since it is formed as a metal body with continuous pores with a size in the range of 500 μ in size ranging from 40% to 80% of the total volume of the product, the impregnated ink oozes out smoothly and the ink retains life. It has the advantage of being efficient over a long period of time and being less prone to deformation of the pad surface.

1 to 4 show each side of a flat pad for a push-in tool according to the invention. When in use, these are fitted and housed in a shallow container with their upper surfaces exposed. FIG. The figure shows the lower surface of the main body 1,
It is made by polymerizing an auxiliary body 2, which is a metal body, which is made separately and whose continuous pores have a slightly larger size, but whose strength is inferior, but whose purpose is to increase ink holding power.

This type of ink pad can be manufactured, for example, as follows.

That is, first, salt particles (particle size 3o~300μ) are placed in a mold.
is filled and sintered.

Next, salt particles with a particle size 9 larger than this salt particle (particle size 6
0 to 500μ) is filled into a mold and sintered in the same manner to produce a lump of two layers of salt particles with different particle sizes.

Next, the molten metal is forced in from above and cooled, and the salt is removed by washing with water.

Note that, if necessary, the auxiliary body 2 may be constructed so that the size of the pores gradually decreases from the bottom toward the surface of the main body 1.

In this case, after filling a mold with a mixture of salt particles having various particle sizes within the range of 30μ to 500μ, the mixture is vibrated for a certain period of time, so that particles with smaller diameters are distributed from the bottom to the top of the mold. It is advantageous to arrange and sinter small to large pieces in sequence.

FIG. 3 shows an example in which the main bodies 1.degree. 1 are stacked one above the other with the auxiliary body 2 in between.

This product is made by filling salt particles of the same type as the initially filled salt particles (30 to 300μ) above the two layers of salt particles explained in Fig. 2, sintering them, and then pouring the molten metal upward. After cooling, wash with water to remove the salt.

FIG. 4 shows an example in which two left and right main bodies 1.1 are provided via a partition plate 3 previously provided in a mold, and are formed for use with different color inks. In this example, if desired, the sizes of the two continuous pores formed in the main bodies 1, 1 on the left and right sides can be changed. This is accomplished by varying the particle size of the salt particles that fill the mold.

As explained above, the present invention is significantly superior to conventional porous pads made of rubber, plastic, etc. in terms of image clarity and durability of the pad itself.

Furthermore, in the manufacturing process, even when finishing into the required flat plate or roll shape, the cutting and polishing is done before washing away the easily water-soluble salts, so there is an advantage that the continuous pores will not be deformed or collapsed. .

[Brief explanation of drawings]

The drawings show each side of the flat pad according to the present invention. Figure 1 shows the main body only, Figures 2 and 3 show the main body with an auxiliary body polymerized, and Figure 4 shows the main body divided into two parts. 1 indicates the main body, 2 indicates the auxiliary body, and 3 indicates the partition plate Patent applicant: Director of the Agency of Industrial Science and Technology Kawa 1) Yube (one other person)

Claims (1)

[Scope of Claims] 1. A porous ink pad for adhering ink to a printing plate surface or a stamp surface formed by impregnating a main body in the form of a flat plate, a roll, etc. with ink, the main body having substantially uniform pores as a whole. Constructed as a metal porous body having
A porous ink pad characterized in that the pores are fine continuous pores having a size in the range of 30 to 500 μm and a total volume of the pores accounting for 40 to 80% of the total volume of the porous body. 2 Fill a mold with easily water-soluble salt particles with a size of 5 to 60μ, and 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 that, a molten metal was press-fitted into the mold to form a fine gap that opened to the outside, and then the molten metal was infiltrated into the fine gap, and after cooling, it was cut into a desired shape such as a flat plate or a roll. A method for producing a porous ink pad, which is then washed to remove easily soluble particles to form a metal porous body having fine continuous pores, and impregnating this with ink.