JPH11321059A - Material for penetration stamping stamp, manufacture thereof, and stamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate generation of leakage of ink from the peripheral rim of a material for a stamp by a method wherein an ink penetrating part constituted by removing the fine particles of polyolefin base resin, in which the acid- soluble fine particles are mixed, is coated integrally with an ink non-penetrating part consisting of the polyolefin base resin. SOLUTION: The material 1 for a penetration stamping stamp is manufactured by a method wherein polyolefin base resin 4, into which acid-soluble fine particles are mixed, is supplied from the upper side of a co-extruder 6 while another polyolefin base resin 5, into which the acid-soluble fine particles are not mixed, is supplied from the left side of the co-extruder 6 through melting extrusion so as to coat the resin 4 by the resin 5. In this case, the material 1 for the penetration stamping stamp is constituted so that an ink penetrating part 2, constituted by removing the fine particles from the polyolefin base resin 4, into which the acid-soluble particles are mixed, is coated with an ink non- penetrating part 3, consisting of the polyolefin base resin 5. According to this constitution, generation of leakage of ink from a connecting part between the ink penetrating part 2 and the ink non-penetrating part 3 can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stamping material for a penetrating stamp made of a sponge material having continuous cells which can be imprinted without impregnating the ink every time the stamping is performed by impregnating the stamping material with ink. About the method.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 47-39212 discloses a method for producing a sponge stamping material having open cells, in which fine particles of an inorganic salt composed of calcium sulfite or calcium sulfate are mixed with a polyolefin resin and extruded to form a sheet. And dissolve the mixed inorganic salt microparticles with an inorganic acid,
There has been proposed a method in which the product is extracted, neutralized with an alkaline solution, washed with water, and dried. In addition, the actual application 53-14
In No. 3033, acid-soluble fine particles soluble in acids such as calcium carbonate and magnesium carbonate are uniformly filled in a polyolefin-based resin, and after being formed into a cylindrical shape by an extruder,
It is described that a continuous porous body having a porosity of 60 to 70% can be obtained by dissolving fine particles filled with hydrochloric acid, nitric acid, or the like.

On the other hand, the sponge-shaped printing material thus obtained can be formed into an actual stamp by the method described in Japanese Patent Application Laid-Open No.
As can be seen in JP-A-63285, it is necessary to prevent the ink from leaking from the cut surface of the stamp material by bonding the joint between the stamp material and the holder holding the stamp material by heat welding or the like.

FIG. 5 is a cross-sectional view showing an example of a conventional stamp, and FIG. 6 is a schematic view showing a process of assembling a conventional stamp and holder. As shown in FIG. 5, a conventional stamp 20 includes a stamping material 21 made of open cells of a polyolefin resin, a holder 22 supporting the stamping material 21, a base 23 supporting the stamping material 21, and an ink for supplying ink to the stamping material 21. It roughly comprises a storage section 24, a stopper 25 for preventing drying and leakage of ink, a case 26 for housing the whole, and a cap 27 for protecting the stamped surface.

[0005] Manufacturing of the conventional stamp 20 has been performed in the following procedure. First, as shown in FIG.
A base 23 and an ink storage unit 24 are formed inside the holder 22, and the stamp material 21 is attached. In the state shown in FIG. 6B, ink leaks from the joint between the stamp material 21 and the holder 22. Therefore, as shown in FIG. 6C, this joint is welded (reference numeral 28 in the figure). Prevent ink leakage. After performing stamping on the surface of the stamping material 21, a stopper 25 is attached to the lower opening of the holder 22, and the holder 22 is attached to the case 2.
The stamp 20 can be manufactured by accommodating the cap 6 and attaching the cap 27 thereto.

[0006]

In the case of the stamp 20 shown in FIG. 5, when the adhesion between the stamping material 21 and the welded portion 28 of the holder 22 is incomplete and ink leakage occurs, a large amount of unnecessary ink is produced around the stamped mark. It will adhere and become a fatally defective product as a stamp. However, since the sponge-shaped stamping material 21 is a continuous foam, if it is softened by heating, it has the property of shrinking by the amount of air bubbles, and it is difficult to reliably produce a stamp that does not cause ink leakage. As a countermeasure against this, conventionally, all the stamps are inspected for ink leaks and shipped without defective products, which requires a great deal of trouble.

In particular, for a stamp that can be stamped many times with one replenishment of ink and that can be neatly stamped, it is necessary that the amount of ink used for transfer in a single stamping be small and constant. There is a demand for a stamping material having extremely small bubbles having an average bubble diameter of several μm. However, the smaller the air bubbles of the printing material, the worse the ink permeability becomes, and the greater the amount of ink leakage from a place where the heat welding is incomplete. Therefore, in order to realize an ideal stamp, it is required to use a sponge material having a bubble as small as possible, and to form a non-ink-penetrating portion by securely bonding a joining portion between the stamping material and the holder. .
Further, a welding portion 2 is used as a joining portion between the stamp material 21 and the holder 22.
Therefore, the periphery of the stamp surface of the stamp material 21 could not be used as the stamp surface. In particular, in the case of a stamp having a small stamp surface, miniaturization was hindered, and this was a great waste. In view of the above points, an object of the present invention is to provide a stamping material for a penetrating stamp which does not cause ink leakage from the periphery of the stamping material, and a method of manufacturing the stamping material.

[0008]

According to the present invention, there is provided a stamp material for a permeation stamp, wherein an ink-permeable portion formed by removing fine particles from a polyolefin resin mixed with acid-soluble fine particles is used as a non-ink material made of a polyolefin resin. It is characterized by being integrally coated with a permeation part. In other words, by using a polyolefin resin as the raw material for both the ink-permeable portion and the ink-non-permeable portion, and by integrally covering the ink-permeable portion with the ink-non-permeable portion, the ink-permeable portion and the ink-non-permeable portion adhere well, A stamping material for a penetrating stamp without ink leakage from the joint can be obtained.

The method for producing a stamping material for a permeation stamp according to the present invention is characterized in that a polyolefin resin mixed with acid-soluble fine particles is coated with a polyolefin resin not mixed with acid-soluble fine particles and extruded so as to be integrated. Molded,
After processing into a desired shape, the fine particles are removed from the resin with an inorganic acid solution to form an ink-penetrated portion.

That is, a polyolefin resin mixed with acid-soluble fine particles serving as an ink-permeable portion is coated with a polyolefin resin not mixed with acid-soluble fine particles serving as an ink-impermeable portion, and extruded so as to be integrated. I do. At this time, acid-soluble fine particles are mixed in the part that becomes the ink penetrating part, and the part that becomes the ink penetrating part of the obtained extruded molded body has an appropriate hardness, so that the stamped surface is processed. Can be easily performed. Thereafter, the ink-permeable portion can be formed by removing acid-soluble fine particles from the resin with an inorganic acid solution.

Examples of the polyolefin resin which can be suitably used in the present invention include polyethylene resin, chlorinated polyethylene resin, polybutene resin, ethylene-vinyl acetate copolymer resin and the like. In addition, the polyolefin resin used for the ink penetrating part and the polyolefin resin used for the ink non-penetrating part are preferably exactly the same, but if it is a so-called polyolefin resin, it fits together and adheres well. It doesn't hurt.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings, but the present invention is not limited to only these embodiments. FIG. 1 is a configuration diagram showing a stamping material for a permeation stamp according to the present embodiment. FIG. 1A shows a stamping material having a rectangular outer shape, and FIG. Is shown. This penetrating stamp stamp material 1
Is constituted by covering an ink-permeable portion 2 obtained by removing fine particles from a polyolefin-based resin mixed with acid-soluble fine particles with an ink-impermeable portion 3 made of a polyolefin-based resin.

As a method for producing such a stamp material 1 for penetrating stamps, as shown in FIG. 2, a polyolefin resin 4 mixed with acid-soluble fine particles and a polyolefin resin 5 mixed with no acid-soluble fine particles are used. At the same time by co-extrusion. The resin 4 is supplied to the co-extruder 6 as shown in FIG. 2 from the upper side in the figure and the resin 5 from the left side in the figure, and the resin 5 is melt-extruded so as to cover the resin 4. Since the resin 4 and the resin 5 are the same kind of resin, it is possible to obtain a double molded body 7 in which two kinds of resins are in very good contact.
As another method, there is a method of extruding the resin 4 and then coating the resin 4 with the resin 5 using a coating extruder.

FIG. 3 is a schematic view showing a manufacturing process of a stamping material for a penetration stamp according to the present embodiment. First, FIG.
As shown in (2), the double molded body 7 obtained by extrusion molding is cut in accordance with the length of the stamping material 1 to be manufactured. The polyolefin-based resin 4 mixed with the fine particles has an appropriate hardness and can be easily subjected to additional processing such as cutting. Therefore, as shown in FIG. 3B, the stamp face is processed and the boring is performed. After processing into a desired shape, the fine particles in the resin 4 are dissolved and extracted with an acid solution, and alkali neutralization, washing with water, and drying are performed.
As shown in FIG. 3C, it is possible to obtain an ideal printing material 1 in which the ink-permeable portion 2 and the ink-non-permeable portion 3 are integrated. Further, in the stamp material 1, the entire cross section of the ink-penetrated portion 2 can be used as the stamp face, and there is no unusable portion due to welding at the periphery of the stamp face as in the related art.

FIG. 4 is a cross-sectional view showing an example of a stamp using the stamping material for a penetration stamp according to the present embodiment. FIG.
The stamp 10 shown in FIG. 1 includes a penetrating stamp stamping material 1 including an ink penetrating part 2 and an ink non-penetrating part 3, a base 13,
Ink storage unit 14, stopper 15, case 16, cap 17
It is roughly constituted from. The stamp 10 can be assembled by a method similar to the conventional method. First, the base 13 and the ink storage unit 14 are provided inside the stamp material 1 for the infiltration stamp.
To form The stamp 10 can be manufactured by attaching the stopper 15 to the opening of the ink non-penetrable portion 3, storing the stopper 15 in the case 16, and attaching the cap 17. The technical scope of the present invention is not limited to the above embodiment,
Various changes can be made without departing from the spirit of the present invention.

[0016]

As described above in detail, the stamping material for a permeation stamp according to the present invention is formed by integrally covering an ink-permeable portion with an ink-non-penetrating portion, and from the joint portion between the ink-permeable portion and the ink-non-penetrating portion. No ink leakage. As a result, the reliability of the stamp is improved, and it is possible to save labor such as inspection of all the stamps. Without changing the conventional stamp structure or stamping surface processing method, instead of relying on the reliable and reliable means of heat welding to prevent ink leakage, using the means of co-extrusion and coating extrusion which have already been established as molding techniques Can be solved. In addition, since there is no useless area that cannot be used as a stamp surface, a stamp having a small stamp surface can be downsized. In particular, the effect of miniaturization of a stamp having such a small stamp surface is great.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a stamping material for a penetration stamp according to an embodiment.

FIG. 2 is a schematic diagram illustrating an example of a co-extruder.

FIG. 3 is a schematic view showing a manufacturing process of a stamp material for a penetration stamp according to the present embodiment.

FIG. 4 is a cross-sectional view illustrating an example of a stamp using the stamping material for a penetration stamp according to the present embodiment.

FIG. 5 is a sectional view showing an example of a conventional stamp.

FIG. 6 is a schematic view showing a conventional assembling process of a stamping material and a holder.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 stamping material for penetrating stamp 2 ink penetrating portion 3 ink non-penetrating portion 4 polyolefin resin mixed with acid-soluble fine particles 5 polyolefin resin not mixed with acid-soluble fine particles 6 co-extruder 7 double molded body 10 stamp 13 base 14 ink storage unit 15 stopper 16 case 17 cap

Claims (3)

[Claims] An ink permeation part obtained by removing fine particles from a polyolefin resin mixed with acid-soluble fine particles is integrally coated with an ink non-penetration part made of a polyolefin resin. Stamp material for stamps. 2. A polyolefin resin mixed with acid-soluble microparticles is coated with a polyolefin resin not mixed with acid-soluble microparticles, extruded to be integrated, processed into a desired shape, and then processed into an inorganic material. A method for producing a stamping material for a penetrating stamp, comprising forming an ink penetrating portion by removing the fine particles from the resin with an acid solution. 3. A stamp using the stamping material for a penetration stamp according to claim 1.