JP2002210910A - Method for forming seal surface of thermoplastic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately form a seal surface on a front surface of a printing element with a character, a graphic form or the like provided on an original sheet and to obtain a clear seal print as an original. SOLUTION: A method for forming the seal surface of a thermoplastic resin comprises the steps of superposing a transparent original sheet partitioned and formed at a part formed with a character of a graphic form to be the seal surface, and a part not formed therewith according to large and small infrared transmission degrees on an open-cell foam thermoplastic porous sealing material mixed with a heating material fine power for heating by an infrared ray; irradiating the ray from a front side of the original sheet; forming a non-porous protective film impossible to bleed an ink melt and solidified by heating the powder mixed in the front layer of the part heated by transmitting the ray of the front surface of the porous sealing material; and forming a residual front surface of the porous sealing material corresponding to a part having a small infrared transmission degree of the original sheet as an ink bleeding surface. The method further comprises the steps of forming the transparent film in a double structure of front and rear layers, providing a cooling layer therein, and forming an ink bleeding part and a non-ink bleeding part at the thermoplastic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a stamped surface of a printed body using a thermoplastic resin.
Heating material fine powder is mixed with a porous stamping material of thermoplastic resin,
The present invention relates to a method for producing a stamp surface on a thermoplastic resin stamp material by irradiating infrared rays using a document sheet.

[0002]

2. Description of the Related Art As in the present invention, a porous stamping material using a thermoplastic resin mixed with fine powder of a heating material, a transparent original sheet on which figures and characters are formed, and a transparent film disposed between them There have been many applications of a method for producing a stamp surface in which infrared light is irradiated from the original side.

JP-A-9-26 filed by the same applicant as the present invention
No. 3030 (hereinafter referred to as (A)) and JP-A-10-1
No. 14132 (hereinafter referred to as (b)). The earlier applications (a) and (b) use a transparent sheet, and the purpose of this transparent sheet is to arrange the characters and figures of the manuscript against the thermoplastic resin, and between them the transparent sheet Are placed and press-bonded to prevent the characters and figures on the original sheet from being fused with the thermoplastic resin during infrared irradiation. Thus, the document is prevented from being stained or damaged.

[0004] Japanese Patent Application Laid-Open No. H10-138441 (hereinafter referred to as (c)) and Japanese Patent Application Laid-Open No. H11-91067 (hereinafter referred to as (2)) exist. In the columns of the detailed description of the inventions (c) and (d), the heat generated by the black ink
It is described that the acrylic sheet used as the transparent resin plate is not damaged as a result of being blocked by the ET transparent sheet or dispersed and transmitted along the transparent sheet. As a result, the black ink that forms figures and characters on the original sheet irradiates infrared rays, generates heat, and is dissipated to some extent by the transparent sheet (synthetic resin sheet) between them (a) and (b). ) Is not described, but it is natural that the synthetic resin has thermal conductivity.

In the invention described above, a transparent sheet (synthetic resin sheet) is disposed below the document sheet with the side having the characters, figures, and the like facing downward, and the heating material is further kneaded below. Thermoplastic resin made of a porous material. A pressure is applied to the stacked layers, and infrared rays are irradiated from above the original sheet side. Then, the infrared rays first absorb the infrared rays in the characters and drawings on the document sheet, and generate heat. Further, infrared rays other than those described above also pass through the transparent sheet and reach the printed body of the porous thermoplastic resin.

[0006] Then, the infrared rays react with the heating material kneaded in the porous thermoplastic resin to generate heat and melt the thermoplastic resin around the heating material. By the way, the heat generated by the characters, figures, etc. of the original sheet is naturally transmitted to the transparent sheet, and even though it is very slightly dispersed in the original sheet, most of the heat is also transmitted to the porous thermoplastic resin. Then, in addition to the infrared rays and the melting of the heat generating material, the heat in the original sheet is also applied, and the criticality (boundary) between the existing part and the non-existent part of the characters and figures of the original sheet is clearly changed to the porous thermoplastic resin. You will not be able to copy. As a result, when imprinting is performed on a printing surface using the above-described printing body, a clear imprint cannot be obtained.

Therefore, the aforementioned (a), (b), and (c)
The transparent sheet (2) has insufficient heat dispersion, and transfers heat to the thermoplastic resin as a printed body. Then, if the melting temperature of the thermoplastic resin is low, the thermoplastic resin is melted, resulting in an inconvenience that a clear imprint cannot be obtained as a document. Conversely, if the melting temperature of the thermoplastic resin is high, a strong light amount (irradiation of the heating material to a high temperature) and a strong compressive force are required, and the detailed portion of the document cannot be directly formed on the stamp face.

Further, when the above-mentioned conventional method is expanded and taken into consideration, it seems that the problem of the present invention can be solved if the transparent sheet is made thicker. However, when the thickness of the transparent sheet is increased, the transparency of the transparent sheet decreases, and the original sheet, the transparent sheet, and the thermoplastic resin sheet are stacked in this order, and a clear imprint is obtained because the infrared ray is irradiated from the original sheet side. I can't do that. If the sheet is thick, infrared rays penetrate through the transparent sheet, so that the infrared rays are refracted by the flow of resin at the time of forming the sheet and the stress at the time of molding, so that the stamped surface cannot be created as in the original.

[0009]

SUMMARY OF THE INVENTION As described above, the conventional problem, that is, a transparent sheet (synthetic resin sheet) is placed on the lower side of the original sheet with characters, figures, etc.
Furthermore, when a thermoplastic resin, which is a printing body mixed with a heat generating material, is laminated below and pressed against and irradiated with infrared light from above, the thermal dispersion of the transparent sheet is weak. It generates heat. Then, this heat is transmitted to the transparent sheet, and if the heat dispersing power of the transparent sheet is weak, the heat is transmitted to the thermoplastic resin below the transparent sheet, thereby melting the thermoplastic resin. Then, not only does the manuscript and the created stamp face not become faithful, but if the document is a fine document, the stamp surface itself cannot be created. Therefore, a clear imprint cannot be obtained. By solving the above-mentioned problems, the present invention is to obtain a clear imprint for the purpose of efficiently performing the heat dispersing force of the transparent sheet.

[0010]

Means for Solving the Problems In a continuous-cell thermoplastic porous stamp material mixed with fine powder of a heating material which generates heat by infrared irradiation, a portion where a character or a figure to be a stamp surface is formed and a portion where no character or figure is formed are formed. Are overlapped on a transparent original sheet sectioned according to the degree of infrared transmittance, and irradiate infrared rays from the front side of the transparent original sheet, and the surface layer of a portion of the surface of the porous stamp material that is heated by the transmission of infrared rays is irradiated. The heat-generating material mixed therein is melted and solidified under the heat of the fine powder to form a non-porous protective film from which ink cannot ooze out. In the method of forming a stamp surface, in which the remaining surface of the quality stamp material is formed on the ink exuding surface, a transparent film is overlaid on the character or figure forming side of the transparent original sheet, and a thermoplastic resin is further overlaid on the transparent film side. The transparent film has a double-layered structure of front and back layers, a cooling layer is provided inside the transparent film, and a method for forming a stamped surface of a thermoplastic resin is characterized in that an ink bleeding portion and a non-ink bleeding portion are formed in the thermoplastic resin. is there.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in more detail with reference to FIGS. Reference numeral 1 denotes a transparent document sheet, and an existing portion 5 on one side of which has characters, graphics, and the like.
The characters, figures, and the like (existing portion 5) are inks made of pigments or dyes that generate heat with infrared rays. For example, carbon, phthalocyanine-based, polycyclic quinone-based, perinone-based, perylene-based, and disure-based materials that generate heat by absorbing infrared rays may be used. It is also possible to use a thermal transfer ribbon such as a word processor. The sheet material of the manuscript sheet 1 may be any material such as polypropylene, polyethylene, acrylic, etc., as long as it is transparent or translucent and can transmit infrared light.

Reference numeral 2 denotes a printing body, which is a porous body made of a thermoplastic resin. Further, the heat generating material fine powder is mixed in the entire printing body 2. It is sufficient that the heat generating material fine powder can generate heat by infrared irradiation. For example, carbon black or the above-mentioned coloring agent which generates heat by infrared rays may be used, and fine metal powder such as tantalum and brass can also be used. The material of the thermoplastic resin is polypropylene, polyethylene, etc.
Most polyolefin-based, polyamide-based and other thermoplastic resins and thermoplastic elastomers can be used. By mixing such a material and a granulating agent (calcium carbonate, salt, etc.), further mixing the heating material fine powder, extracting a granulating material,
A printed body 2 made of a continuous porous thermoplastic resin is obtained.

Reference numeral 3 denotes a transparent sheet, which comprises two transparent films and a cooling layer 4 interposed therebetween.
The transparent film may transmit infrared rays, and the material may be, for example, a polyolefin-based or polyamide-based material.Specifically, urea resin, melamine resin, vinyl chloride resin, vinylidene chloride, vinyl acetate, polypropylene, polypropylene, Polycarbonate and the like can be selected. Further, as the transparent film, one having a melting temperature higher than the melting temperature of the thermoplastic resin of the printing body 2 can be used. The thickness of the transparent sheet 3 can be 10 μm to 150 μm. The cooling layer 4 includes a liquid layer, a gas layer,
A semi-liquid layer is selectable. If it is a liquid layer, it is also possible to mix a heat absorber with the aqueous solution. At this time, the heat absorber is intended by the present invention as long as it can store heat or can be partially taken away as heat of vaporization.

In the case of a gas layer, at least one of air, oxygen, nitrogen, carbon dioxide and the like can be selected as long as it is a transparent gas. In the case of a semi-liquid layer, for example, as a gelling agent, a transparent cellulosic polymer (methyl cellulose, ethyl cellulose, hydroxyethyl cellulose,
Carboxymethylcellulose, methylhydroxypropylcellulose), starch-based polymers (soluble starch,
Carboxymethyl starch, methyl starch), alginic acid polymers (propylene glycol alginate, alginate), vinyl polymers (polyvinyl alcohol, polyvinylpyrrolidone, polyvinylpyrrolidone, polyvinylmethylether, carboxyvinyl polymer, sodium polyacrylate), Polysaccharide polymers (guar gum, locust bingham, quince seed, carrageenan, galactan, xanthan gum, dextran,
At least one of succinoglucan, curdlan), inorganic polymer (bentonite, laponite) and the like can be freely selected.

As described above, the heat generated in the original sheet 1 is surely absorbed by the transparent sheet 3 and is not transmitted to the thermoplastic resin as the printing body 2. Further, since the cooling layer 4 and the film are also transparent, a stamped surface can be formed on the surface of the printing body 2 by melting only the infrared rays transmitted through the transparent sheet 3.
Therefore, a stamp surface can be created faithfully on a document. The method for producing the transparent sheet 3 is as follows.
Between two transparent films,
The transparent film shall be completely sealed on all sides by heat sealing. If the cooling layer 4 is a gas layer, three sides are thermally fused,
A desired gas is injected while removing the gas from the other one, and the other one is heat-sealed. A liquid layer is similarly created.

Next, in the case of a gel which is a semi-liquid layer,
One of the two transparent films is thinly applied, the other is laminated, and the four sides are thermally fused to form a transparent sheet 3. Next, as a preparation method, the side where the characters, figures, and the like on the original sheet 1 are present (existing portion 5) is directed downward, the transparent sheet 3 is disposed below the side, and a thermoplastic resin is further disposed below. The printed bodies 2 are arranged and laminated. Then, in a state of being pressed in the vertical direction, infrared rays are irradiated from the original sheet 1 side. Here, the infrared ray is in the infrared region of 0.76 μm to 1.
Any light source containing 0 μm may be used.

Then, the infrared rays enter the sheet from above the original sheet 1 and travel downward, where the characters and figures are present by means of the ink and heat generated by the infrared rays (existing portion 5). Generates heat and hinders the downward movement of infrared rays. Other portions of the infrared ray travel on the lower surface of the original sheet 1 and advance to the transparent sheet 3. Manuscript sheet 1
Is transmitted through the transparent film above the transparent sheet 3, passes through the transparent cooling layer 4, and further passes through the transparent film below. The infrared light transmitted through the original sheet 1 and the transparent sheet 3 reaches the print body 2.

The infrared rays that have reached the printed body 2 react with the fine heat generating material kneaded in the printed body 2 to generate heat. Then, the thermoplastic resin around the heat generating material fine powder is melted, flows into the pores on the surface of the printing body 2 and is solidified and closed (melted solidified portion 6). In this way, a portion where the ink does not bleed (the melt-solidified portion 6) is formed, and the existing portion of the document sheet 1 such as characters and figures is formed on the surface of the printing body 2 as a portion where the ink bleeds. Will be done.

Most of the heat generated by the characters and figures provided on the original sheet 1 is transmitted to the transparent sheet 3 which is in close contact therewith, transmitted through the transparent film, and reaches the cooling layer 4.
Here, the heat is absorbed by the cooling layer 4 and the transparent sheet 3
Does not reach the transparent film below the. As a result, the surface of the print body 2 that is in close contact with the transparent film below the transparent sheet 3 is not melted by the heat of the characters and drawings on the original sheet 1. Therefore, it is possible to accurately create a stamp surface on the surface of the print body for characters, figures, and the like provided on the document sheet 1. At the same time, it is possible to obtain a clear seal imprint as the original.

[0020]

With the above configuration, the heat generated by the characters and figures provided on the original sheet 1 can be reliably absorbed by the cooling layer 4 of the transparent sheet. Original sheet 1
Is not melted by the heat of the letters and figures. Therefore, it is possible to accurately create a stamp surface on the surface of the print body for characters, figures, and the like provided on the document sheet 1. At the same time, it is possible to obtain a clear seal imprint as the original.

[0021]

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory view of an embodiment of the present invention after infrared irradiation.

[Explanation of symbols]

 1: Original sheet 2: Printed body 3: Transparent sheet 4: Cooling layer 5: Presence part 6: Melted and solidified part

Claims (2)

[Claims] 1. A portion of a continuous porous thermoplastic porous stamp material mixed with fine powder of a heat generating material which generates heat by infrared irradiation, a portion where a character or a figure to be a stamp surface is formed and a portion where the character or figure is not formed are infrared transmittance. A transparent original sheet sectioned by the size of the transparent original sheet is overlapped, and infrared rays are irradiated from the front side of the transparent original sheet, and the surface layer of the portion of the surface of the porous stamp material that is heated by the transmission of infrared rays is mixed therein. The remaining portion of the porous stamping material corresponding to a portion of the transparent document sheet having a low infrared transmittance, which is formed on a non-porous protective film that is melted and solidified under the heat generated by the fine powder of the heat generating material to prevent ink from oozing out. In the method of forming a stamped surface, the surface of which is formed on an ink-exuding surface, a transparent film is overlaid on a character or figure forming side of a transparent original sheet, and a thermoplastic resin is further overlaid on the transparent film side. A method for producing a stamped surface of a thermoplastic resin, comprising: forming a double layer structure of a front and back layer; providing a cooling layer therein; and forming an ink exuding portion and a non-ink exuding portion in the thermoplastic resin. 2. The transparent film according to claim 1, wherein the cooling layer is made of at least one of an air layer, a transparent or translucent aqueous solution layer, and a transparent or translucent gel material layer. How to make a thermoplastic resin stamp surface.