JP4589538B2 - How to make stamped surface of thermoplastic resin - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a method for preparing a printing surface of a printed body using a thermoplastic resin, and in particular, the heating material fine powder is mixed in a porous printing material of a thermoplastic resin, and the original sheet is used for infrared irradiation. The present invention relates to a method for creating a stamp face on a thermoplastic resin stamp material.
[0002]
[Prior art]
As in the present invention, a porous stamping material using a thermoplastic resin mixed with a fine powder of heat generating material, a transparent original sheet on which figures and characters are formed, and a transparent film disposed between them, the original side There have been a large number of applications for a method of creating a stamp face that performs infrared irradiation.
[0003]
There are JP-A-9-263030 (hereinafter referred to as (A)) and JP-A-10-114132 (hereinafter referred to as (B)) by the same applicant as the present invention.
The prior applications (A) and (B) use a transparent sheet, and the purpose of this transparent sheet is to place the characters and figures of the document relative to the thermoplastic resin, and between them, the transparent sheet Is arranged so as to be pressure-welded and prevent the characters and drawings on the original sheet from being fused with the thermoplastic resin during infrared irradiation. This prevents the original from being stained or damaged.
[0004]
Further, there are JP-A-10-138441 (hereinafter referred to as (C)) and JP-A-11-91067 (hereinafter referred to as (2)). In the detailed description column of the inventions of (c) and (d), the heat generated in the black ink is blocked by the transparent sheet made of PET, or dispersed and transmitted along the transparent sheet. There is a description that there is no damage to the acrylic plate adopted as the above. As a result, the black ink that forms the figure and characters on the original sheet hits infrared rays, generates heat, and is thermally dispersed to some extent by the transparent sheet (synthetic resin sheet) between them. Although there is no description in), it is natural that the synthetic resin has thermal conductivity.
[0005]
In the invention as described above, a porous sheet in which a character sheet or drawing side of a manuscript sheet is faced downward, a transparent sheet (synthetic resin sheet) is disposed below, and a heating material is further kneaded below. A thermoplastic resin consisting of body is layered. Pressure is applied to the stacked layers in this way, and infrared rays are irradiated from above the original sheet side. Then, the infrared rays are first absorbed by characters and drawings on the original sheet, and heat is generated. Further, infrared rays other than those described above pass through the transparent sheet and reach the printed body of the porous thermoplastic resin.
[0006]
Then, the heat generating material kneaded into the porous thermoplastic resin reacts with the infrared rays to generate heat and melt the thermoplastic resin around the heat generating material.
By the way, the heat generated by the characters and drawings on the document sheet is naturally transmitted to the transparent sheet, and further, although it is slightly dispersed in the document sheet, it is also transmitted to the porous thermoplastic resin.
Then, in addition to the melting of the infrared rays and the heat generating material, the heat in the original sheet is also added, and the criticality (boundary) of the existing part and the non-existing part of the original sheet character and figure is clearly changed to the porous thermoplastic resin. It will be in a state where it cannot be copied. As a result, when printing is performed on the printing surface using the above-mentioned printing body, a clear imprint cannot be obtained.
[0007]
Therefore, the above-described transparent sheets (a), (b), (c), and (2) are not sufficiently heat-dispersed, and heat is transferred to the thermoplastic resin that is the printing body. Then, when the melting temperature of the thermoplastic resin is low, the thermoplastic resin is melted, and there is a disadvantage that a clear seal cannot be obtained as in the original document.
On the contrary, when the melting temperature of the thermoplastic resin is high, a strong light amount (irradiated to the heat generating material and a high temperature) and a strong compressive force are required, and the detailed portion of the original cannot be built as it is on the stamp surface.
[0008]
Further, when considering and extending the conventional method, it seems that the problem of the present invention can be solved if the transparent sheet is made thick. However, when the transparent sheet is thickened, the transparency of the transparent sheet is lowered, and the original sheet, the transparent sheet, and the thermoplastic resin sheet are laminated in this order, and the infrared ray is irradiated from the original sheet side, so this also obtains a clear impression. I can't.
In addition, if it is thick, infrared rays are transmitted through the transparent sheet, so that the infrared rays are refracted by the flow of the resin when the sheet is produced and the stress at the time of molding, and it is impossible to create a stamped surface as the original.
[0009]
[Problems to be solved by the invention]
As described above, a printed body in which a transparent sheet (synthetic resin sheet) is placed below the character sheet or drawing on the original sheet, and a heating material is further mixed thereunder. When the thermoplastic resin is laminated and pressed and irradiated with infrared rays from above, the heat dispersion force of the transparent sheet is weak, so that the infrared rays are blocked by characters and drawings on the original sheet and heat is generated. Then, this heat is transmitted to the transparent sheet, and when the heat dispersion force of the transparent sheet is weak, it is transmitted to the thermoplastic resin below it, and the thermoplastic resin is melted. Then, not only the original and the created stamp are not faithful, but if the original is fine, the stamp itself cannot be created.
Therefore, a clear seal cannot be obtained.
By solving the problems as described above, the present invention is to obtain a clear imprint for the purpose of efficiently performing the heat dispersion force of the transparent sheet.
[0010]
[Means for Solving the Problems]
On the open-cell thermoplastic porous stamping material mixed with powder of heat-generating material that generates heat when irradiated with infrared rays, the part on which the characters or figures that form the marking face are formed and the part that is not formed are defined by the size of the infrared transmission. The surface of the porous stamping material that is heated by the transmission of infrared rays is mixed in the surface of the porous printing material. Formed on a non-porous protective film that is melted and solidified under heat generation of the powder powder so that ink cannot bleed out, and ink oozes out the remaining surface of the porous printing material corresponding to the portion of the transparent original sheet with low infrared transmittance In the method for creating a stamped surface to be formed on the surface, a transparent film is superimposed on the character or figure forming side of the transparent original sheet, and a thermoplastic resin is further superimposed on the transparent film side. A heavy structure, its interior a cooling layer, a ink bleeding portion and stamp face forming a thermoplastic resin, characterized in that the non-ink-bleeding portion to create the thermoplastic resin.
[0011]
【Example】
A first embodiment of the present invention will be described in more detail with reference to FIGS.
Reference numeral 1 denotes a transparent manuscript sheet, and an existence portion 5 where characters, graphics, and the like exist on one side of the sheet. These letters, figures, etc. (existing part 5) are inks composed of pigments and dyes that generate heat by infrared rays. For example, carbon, phthalocyanine-based, polycyclic quinone-based, perinone-based, perylene-based, disuls-based, or the like that absorbs infrared rays and generates heat may be used. It is also possible to use a thermal transfer ribbon such as a word processor. The sheet material of the original sheet 1 may be any material that is transparent or translucent, such as polypropylene, polyethylene, or acrylic, and that can transmit infrared rays.
[0012]
Reference numeral 2 denotes a printed body, which is a porous body made of a thermoplastic resin. Further, the heat generating material fine powder powder is mixed in the whole printing body 2. The fine powder of the heat generating material only needs to be able to generate heat by infrared irradiation. For example, carbon black or the above-described colorant that generates heat by infrared rays may be used, and metallic fine powder such as aluminum and brass can also be used.
As the material of the thermoplastic resin, most thermoplastic resins and thermoplastic elastomers such as polypropylene, polyethylene, polyolefin, polyamide, and the like can be used. By mixing such a material and a granulating agent (calcium carbonate, salt, etc.) and further mixing the exothermic material fine powder powder, the granulated material is extracted to obtain a printed body 2 made of a continuous porous thermoplastic resin. It is what
[0013]
Reference numeral 3 denotes a transparent sheet, which includes two transparent films and a cooling layer 4 interposed therebetween. The transparent film only needs to transmit infrared rays, and materials such as polyolefin and polyamide can be used. Specifically, urea resin, melamine resin, vinyl chloride resin, vinylidene chloride, vinyl acetate, polypropylene, Polycarbonate or the like can be selected. The transparent film 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 to 150 microns. The cooling layer 4 can be selected from a liquid layer, a gas layer, and a semi-liquid layer. If it is a liquid layer, it is also possible to mix a heat absorber with aqueous solution. The heat absorbent at this time is intended by the present invention if it stores heat or can be partially taken away as heat of vaporization.
[0014]
If it is a gas layer, if it is a transparent gas, at least one or more of air, oxygen, nitrogen, carbon dioxide and the like can be selected.
In the case of a semi-liquid layer, for example, a transparent cellulose polymer (methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, methyl hydroxypropyl cellulose) as a gelling agent, starch polymer (soluble starch, carboxymethyl starch, methyl starch) , Alginate polymers (propylene glycol alginate, alginate), vinyl polymers (polyvinyl alcohol, polyvinyl pyrrolidone,
Polyvinyl pyrrolidone, polyvinyl methyl ether, carboxyvinyl polymer, sodium polyacrylate), polysaccharide polymers (guar gum, locust bin gum, quince seed, carrageenan, galactan, xanthan gum, dextran, succinoglucan, curdlan), inorganic high Among molecules (bentonite, laponite) and the like, at least one kind can be freely selected.
[0015]
In this way, the heat generated in the original sheet 1 is reliably absorbed by the transparent sheet 3 and is not transmitted to the thermoplastic resin that is the printing body 2. Further, since the cooling layer 4 and the film are also transparent, a stamp face can be formed on the surface of the printed body 2 by melting only the infrared rays transmitted through the transparent sheet 3. Therefore, it is possible to create a stamp face faithfully on the document.
The method for producing the transparent sheet 3 is such that the cooling layer 4 is interposed between two transparent films as a finished product, and the two transparent films are completely sealed on all sides by heat sealing. .
If the cooling layer 4 is a gas layer, the three sides are heat-sealed, and a desired gas is injected while removing the gas from the remaining one, and the remaining one is heat-sealed. The liquid layer is similarly produced.
[0016]
Next, in the case of a gel form which is a semi-liquid layer, a thin sheet is applied to one of the two transparent films, the other is laminated, and the other is heat-melted to form the transparent sheet 3.
Next, as a method of preparation, the transparent sheet 3 is disposed below the character sheet or drawing on the original sheet 1 (existing portion 5), the transparent sheet 3 is disposed below, and thermoplastic resin is disposed further below. The printing body 2 is arranged and laminated. Then, infrared rays are irradiated from the side of the original sheet 1 in a state of being pressed from above and below. Here, the infrared light may be a light source including an infrared region of 0.76 μm to 1.0 μm when light such as a xenon lamp or a flash bulb is dispersed.
[0017]
Then, the infrared rays enter the sheet from the upper side of the original sheet 1 and proceed downward, where a portion (existing portion 5) where the characters, the drawings, etc. are present is generated by the characters, drawings, etc. by the ink that generates heat by the infrared rays. This prevents the infrared light from traveling downward. Infrared rays in other parts travel on the lower surface of the document sheet 1 and proceed to the transparent sheet 3. Infrared light that has passed through the document sheet 1 passes 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 rays that have passed through the original sheet 1 and the transparent sheet 3 reach the printing body 2.
[0018]
The infrared rays that have reached the printing body 2 react with the powder of the heat generating material kneaded in the printing body 2 to generate heat. Then, the thermoplastic resin around the heat generating material fine powder is melted, and flows into the pores on the surface of the printing body 2 to be solidified and closed (melt-solidified portion 6). In this way, a portion where the ink does not bleed out (melting and solidifying portion 6) is formed, and the existing portions such as characters and drawings provided on the original sheet 1 are created on the surface of the printing body 2 as a portion where the ink oozes out. Will be.
[0019]
Most of the heat generated by characters, drawings, etc. provided on the original sheet 1 is transmitted to the close-contacted transparent sheet 3 side, is transmitted through the transparent film, and reaches the cooling layer 4. Here, the heat is absorbed by the cooling layer 4 and does not reach the transparent film below the transparent sheet 3. As a result, the surface of the printing body 2 that is in close contact with the lower transparent film of the transparent sheet 3 is not melted by the heat of characters and drawings of the original sheet 1. Accordingly, it is possible to accurately create a stamp on the surface of the printing body with respect to characters and drawings provided on the original sheet 1. At the same time, it is possible to obtain a clear imprint as the manuscript.
[0020]
【effect】
Since it is configured as described above, the heat generated by the characters and drawings provided on the original sheet 1 can be reliably absorbed by the cooling layer 4 of the transparent sheet. The surface of the font 2 is not melted by the heat of characters and drawings on the original sheet 1. Accordingly, it is possible to accurately create a stamp on the surface of the printing body with respect to characters and drawings provided on the original sheet 1. At the same time, it is possible to obtain a clear imprint as the manuscript.
[0021]
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of an embodiment of the present invention.
FIG. 2 is an explanatory diagram after infrared irradiation of an embodiment of the present invention.
1: Document sheet 2: Print body 3: Transparent sheet 4: Cooling layer 5: Presence part 6: Melt solidification part

Claims (2)

On the open-cell thermoplastic porous stamping material mixed with fine powder of heat-generating material that generates heat when irradiated with infrared rays, the part on which the characters or figures that form the marking face are formed and the part that is not formed are defined by the size of the infrared transmission. The surface of the porous stamping material that is heated by the transmission of infrared rays is mixed in the surface of the porous printing material. Formed in a non-porous protective film that is melted and solidified under heat generation of the powder to prevent ink from seeping out, and ink remaining on the remaining surface of the porous printing material corresponding to the portion of the transparent original sheet with low infrared transmittance In the method for creating a stamp face to be formed on the surface, a transparent film is laminated on the character or figure forming side of the transparent original sheet, and a thermoplastic resin is further laminated on the transparent film side. A heavy structure, inside a cooling layer that ink bleeding portion and stamp face forming a thermoplastic resin, characterized in that the non-ink-bleeding portion to create the thermoplastic resin. 2. The thermoplastic resin seal face according to claim 1, wherein the cooling layer is a transparent film in which at least one of an air layer, a transparent or translucent aqueous solution layer, and a transparent or translucent gel substance layer can be selected. How to make.

Images