JP3474930B2 - How to check the invisible surface treatment on the paper - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for confirming a surface-treated portion of a paper which is transparent or has been subjected to a surface treatment of the same color as the paper surface, and more specifically, a paper having a predetermined pH value. The acid-base indicator that reacts with the base material and develops color is diluted and dissolved in a solvent, and this is applied or sprayed onto the paper surface to cause the indicator to develop color, and the color of the paper base material portion and the surface treatment portion is changed. The present invention relates to a technique that allows the surface treated portion to be easily, easily, and quickly confirmed due to a difference.

[0002]

2. Description of the Related Art In the present invention, the paper which is transparent or has been subjected to a surface treatment of the same color as the paper surface refers to all processed paper with or without printing, for example, carbonless copying paper, It is well known that microcapsules containing a color-forming agent and a color-developing agent for developing the color are applied to one side or both sides of a paper substrate.

[0003] Recently, in this technical field, as a technique for partializing the color development, a desensitizing ink is not applied to a predetermined portion of the copy paper surface, but a transparent ink containing microcapsules containing a color former. Is directly printed on the surface of a paper substrate to form a transparent color-forming agent microcapsule layer on the surface of the paper substrate, that is, a microcapsule-containing oil-based ink is used, and the color-forming surface is partially provided by a normal printing technique. The technology that can be used is being developed and is being used.

Since the printing surface of the coloring agent microcapsules thus formed is usually transparent, when the operator or user confirms the transparent printing surface, the conventional desensitization checker uses the developer. It cannot be used for such a sheet that has not been coated, and therefore there is currently no method for confirming such a transparent printing surface.

In addition to this new technique, conventionally, a transparent synthetic resin such as ester rubber or copal, or a solution of natural resin dissolved in a solvent is applied to a predetermined portion of the paper surface, for example, a gloss varnishing process or a transparent treatment. A method of partially applying a transparent coated surface to the paper surface, such as vinyl drawing processing that applies a quick-drying varnish and vinyl acetate mixture, waxing processing that heat-melts and applies a material mainly composed of paraffin wax, or There is a method of partially coating the surface of the paper substrate with a pigment with the same color as the surface of the paper substrate added to resin, clay, etc. There is no method for easily and quickly confirming such a coated surface.

[0006]

Therefore, for a sheet having such a non-visible surface treatment portion, for example,
It is necessary to confirm the position of the surface treatment part when the operator makes a registration etc. during the manufacturing, and in this case, the fluorescent agent is added to the surface treatment member such as ink or coating material to form the surface treatment. The part was irradiated with black light and the position was confirmed. However, when the fluorescent agent is added to the surface-treated member, the cost of the member may increase, and the properties thereof may change. Furthermore, once the fluorescent agent is added, even after being commercialized,
Since the component remains, there is a disadvantage that the color is carelessly developed. Therefore, in view of such a problem, the present invention has an object to provide a method for an operator or a user to easily and quickly check the invisible surface treatment portion provided on the paper surface. is there.

[0007]

In order to achieve the above-mentioned object, in the present invention, it is invisible because it is transparent or is printed or coated in the same color as the paper surface on a predetermined portion of the paper surface. A method for confirming a surface treatment part, wherein a color solution prepared by diluting an acid-base indicator that reacts with a base material of the paper having a predetermined pH value with a solvent with a solvent is applied or sprayed on the paper surface. Providing a confirmation method characterized in that the surface treatment portion is made visible by making a difference in coloration state of the acid-base indicator between the paper base material portion and the surface treatment portion. Is.

[0008]

By applying or spraying a diluted solution of an acid-base indicator that develops a color when it reacts with the base material of paper having a predetermined pH value, especially by spraying with a spray cylinder As a result, the indicator was quickly and uniformly sprayed on the paper surface and reacted with the paper base material portion to be colored uniformly, while in the surface treatment portion, the acid-base indicator did not react with or reacted with the surface treatment member. However, since the pH value of the paper base material and the surface treatment member are usually different, a difference occurs in the coloration state between the paper base material portion and the surface treatment member, and the operator or user cannot visually recognize the difference. The surface-treated part can be made visible.

[0009]

The present invention will be described in detail below with reference to preferred embodiments. 1 and 2 are perspective views of the front and back surfaces of a sheet of paper 1 on which the backside of the sheet 1 has been subjected to a surface treatment section 5 by transparent printing, that is, as shown in FIGS. The predetermined portion is provided with a surface treatment portion 5 formed by using a transparent ink containing a color-forming agent microcapsule as a member 4.

Then, on the back surface of the paper 1, the paper base material 2
By applying or spraying the coloring solution 6 of the acid-base indicator that reacts with and is colored, in the paper base material portion 3, the light-colored state A of a light red color is uniformly distributed according to the pH value of the paper base material 2. On the other hand, in the surface treatment section 5, the pH of the surface treatment member 4
A dark red coloring state B appears evenly according to the value. That is, there is a difference between A and B in the coloring state between the paper base material portion 3 and the surface treatment portion 5, and the operator or the user can confirm the surface treatment portion 5 by visually recognizing the difference.

Next, the present invention will be described in more detail based on an embodiment using a spray cylinder shown in FIG. The spray cylinder 11 of the present embodiment is provided with a valve for controlling the ejection of the enclosed solution at the top of the pressure resistant container 12 made of tin. The pressure resistant container 12 is provided with an acid-base indicator, methyl red. , A coloring solution 13 diluted to 0.5% by weight with dichloromethane as a solvent, and a compressed gas 14 of liquefied petroleum gas containing propane and / or butane as a main component. Then, at the time of its use, the coloring solution 13 which is sufficiently fine particles is sprayed from the spray nozzle 15 to the paper surface at a distance of about 20 to 40 cm from the paper surface quickly and uniformly. is there.

The acid-base indicator in the present invention is a phthalein type, sulfonephthalein type, which has been conventionally used,
The dye is arbitrarily selected from azo-based, triphenylmethane-based, benzoin-based, and nitro-based organic dyes, but in the case of the present invention, in particular, it is necessary to react with the paper base material of the printed matter to develop color. Since the pH value of the paper base material is usually in the acidic range, it is suitable that the indicator is colored at a pH value of about 2 to 6. Therefore, preferably, methyl red (coloring range: pH 4.2 to 6.2), tetrabromophenol blue (the same: pH 2.4 to 4.4), bromcresol green (the same: pH 3.4 to 5.4). 4) and the like are preferably used, and since these acid-base indicators have different coloring ranges, they are appropriately selected according to the pH value of the paper substrate to be checked.

The solvent for diluting and dissolving the acid-base indicator is, for example, most preferably dichloromethane in the case of using a spray cylinder, and methyl alcohol or ethyl in the case of coating by other means or spraying. Alcohols, alcohols such as propyl alcohol may be used as a solvent, and they are appropriately selected according to the acid-base indicator, and the dilution concentration thereof takes into consideration the degree of application or spraying, the coloration state, etc. As a result,
About 1.0% by weight is preferable, and 0.3 to 0.7 is preferable.
%, And more preferably about 0.4 to 0.6% by weight.

[0014]

INDUSTRIAL APPLICABILITY According to the present invention, a diluted solution of an acid-base indicator that reacts with the base material of a paper having a predetermined pH value to produce a color is applied or sprayed on the paper surface to obtain a spray-type ink. By atomizing and spraying with a cylinder, the indicator is quickly and evenly dispersed on the paper surface and reacts with the paper base material portion to be evenly colored, while in the surface treatment portion, the acid-base indicator is added to the surface treatment member. Even if it does not react with, or even if it reacts, since the pH value of the paper base material and the surface treatment member are usually different, there is a difference in the coloration state between the paper base material portion and the surface treatment portion, and the operator or the user ,
Due to this difference, the surface-treated portion which cannot be visually recognized can be made visible, which has an effect of facilitating the registration work at the time of manufacturing the printed matter and the confirmation work at the time of use.

[Brief description of drawings]

FIG. 1 is a perspective view of a front surface of a sheet of paper with transparent printing on the back surface.

FIG. 2 is a perspective view of the back surface of a sheet of paper with transparent printing on the back surface.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a state diagram after spraying a coloring solution on the back surface of the paper.

FIG. 5 is a vertical cross-sectional view of a colored solution spray type cylinder that is an embodiment of the present invention.

[Explanation of symbols]

1 ... Paper 2 ... Paper base material 3 ... Paper base material 4 ... Surface treatment member 5 ... Surface treatment section A: Coloring state of paper base material B: Coloring state of the surface treatment part 11 ... Spray cylinder 12 ... Pressure resistant container 13 ... Coloring solution 14 ... Compressed gas 15 ... Spray nozzle

─────────────────────────────────────────────────── ─── Continued Front Page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01N 31/22 123 B41M 5/12

Claims (3)

(57) [Claims] 1. A method for confirming an invisible surface-treated portion which is transparent or is printed or coated in the same color as the paper surface on a predetermined portion of the paper surface, the paper having a predetermined pH value. A color solution obtained by diluting an acid-base indicator that reacts with the substrate with a color with a solvent, is applied or sprayed onto the paper surface, and in the paper base portion and the surface treatment portion, the acid-base indicator A method for confirming a non-visible surface-treated portion applied to a paper surface, wherein the surface-treated portion is made visible by making a difference in a coloring state appear. 2. The acid-base indicator selected from methyl red, tetrabromophenol blue, or bromcresol green is diluted with a solvent to a concentration of 0.1 to 1.0% by weight. The method for confirming a non-visible surface treatment portion applied to a paper surface according to claim 1, wherein the surface treatment portion is obtained by the above method. 3. The color developing solution is enclosed in a spray cylinder comprising a pressure-resistant container in which a compressed gas such as liquefied petroleum gas or liquefied chlorofluorocarbon gas is enclosed, and is sprayed onto the paper surface. The method for confirming the invisible surface-treated portion provided on the paper surface according to item 1 above.