JPH09267542A - Stencil printing original-plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to decolorize an impression after a predetermined time is elapsed by using ink having color erasing composition at a thermal stencil original sheet for constituting a printing part stationarily covering the surface of an impregnating material of the ink fixed to the lower surface of a base material capable of coupling to a grip. SOLUTION: A stencil printing original plate comprises a hollow base member 26 having a shallow recess 25 at a stamp body lower surface side, an impregnating material 27 impregnated with ink, and a thermal stencil original sheet 28 adhered to the outer periphery of the member 26 with an adhesive 29 to cover the lower surface of the material 27 and the outer periphery of the member 26. A decolorizing ink is impregnated to the material 27 to use coloring agent for color developing at alkali side with discoloring area of, for example, pH of 7 to 10. Since its initial ink composition is alkaline, o-cresol phthalein of the agent is color developed, but the sodium carbonate in the composition absorbs the carbon dioxide in the air to be neutralized, and hence becomes colorless. The time required for decolorization is about 70 hours.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing plate used in a stamping device.

[0002]

2. Description of the Related Art Conventionally, the applicant of the present application has disclosed in Japanese Patent Laid-Open No. 4-226.
In Japanese Patent No. 778, there is proposed a stamping device including a stamping body and a heating punching device that forms a punching hole in the stamping surface portion of the stamping body.

The stamp body is provided with a grip portion, a body case, a supply reel and a take-up reel for supplying and winding the tape-shaped heat-sensitive stencil sheet.
An ink pad for supplying ink to the perforated heat-sensitive stencil sheet.

The heating and punching device is provided with a punching mounting portion for removably mounting the stamp body, a feeding mechanism for feeding the heat-sensitive stencil sheet of the stamp body, and forming a hole in the heat-sensitive stencil sheet of the stamp body. It is composed of a thermal head, a keyboard for inputting characters and symbols, and a control device that controls the feeding mechanism and the thermal head so that a character string input based on input data is punched in the heat-sensitive stencil sheet. ing.

According to the above stamping device, the stamp body is provided with a tape-shaped heat-sensitive stencil sheet, and a desired character string pattern can be punched on the stamp face portion of the stamp body by the heating punching device. Therefore, a different pattern can be punched in the stamp face portion, and since the ink is automatically supplied from the ink pad inside the stamp body to the stamp face portion during printing, external ink is applied to the stamp face portion. You can print without.

[0006] The applicant of the present invention has also filed Japanese Patent Application Laid-Open No. 7-2908.
No. 07, the stamp body is a rectangular parallelepiped hollow hollow synthetic resin base member, an impregnated body mounted in a recess of the base member and impregnated with ink, a lower surface of the impregnated body, and an outer periphery of the base member. A stencil printing plate composed of a heat-sensitive stencil sheet covering the side was proposed.

The impregnated body is made of an elastic foam or non-woven fabric of synthetic resin material and has a two-layer structure with different densities. The high-density first impregnation layer is provided on the heat-sensitive stencil sheet side, and the low-density second impregnation layer is provided on the concave side of the base member.

Due to such a structure, the layer having a low density has a sufficient ink impregnation capacity and improves the imprinting durability. On the other hand, the high-density layer has strong ink holding ability and rigidity, and in order to prevent ink leakage, ink shortage, and warpage and distortion at the time of punching / imprinting, high ink holding ability and high print quality are achieved while being small. It is also equipped with excellent marking durability.

According to the stamping method using such an original plate for stencil printing, a stamp can be easily formed and a stamp image can be formed on various media.

[0010]

The ink impregnation body (ink pad) used for the stencil printing plate or the improved stamp body is impregnated with an oil-based ink. This is an inorganic or organic pigment such as carbon black or phthalocyanine dispersed in a vehicle in which a binder resin is dissolved in a non-volatile solvent such as mineral oil or animal or vegetable oil.

Since the ink used for the ordinary stencil printing plate has such a composition, the printed image obtained by the stencil printing plate has durability in the imprinted image after printing. In addition, such durable inks are generally required.

However, if a circular stamp or the like is created by a stamp device using such an ink, the circular stamp is imprinted, and the circular is circulated, the circular mark remains on the material even after the circulation is completed.
When filing this material, the circular is an obstacle. Also, depending on the place where the circular stamp is stamped, necessary information is hidden. In addition, if there is a possibility that this material will be copied at a later date and given to an outsider, copying it as it is will cause the circulation mark to appear in the copy, and there is a risk that the group structure will be exposed to the outside. .

For this reason, for highly important materials, a separate sheet with a circular stamp is attached to the circular material for circulation, or when the copy is made, the circular portion is covered with other paper or the like. Was doing the complicated work of.

An object of the present invention is to provide an original plate for stencil printing which can obtain a stamp image with sufficient visibility within a predetermined time and can erase the stamp image after a predetermined time. is there.

[0015]

In order to achieve this object, a stencil printing plate according to claim 1 of the present invention comprises a base member which can be connected to a grip portion for gripping by hand, and the base member. In particular, the ink is decolorized for the purpose of including an impregnated body fixed to the lower surface of the ink and impregnated with the ink, and a heat-sensitive stencil sheet that fixedly covers the surface of the impregnated body and constitutes the stamp face part. Those having a composition of nature are used.

In the stencil printing plate of the present invention having the above-mentioned structure, since the ink used is a decolorizable one, the stamp image stamped using this stencil printing plate is, for example, a circulation. Although it is clear within a predetermined time such as time, if it is filed as a material after a predetermined time after the circulation and the like, it will be erased. For this reason, it will not interfere with later viewing or making copies of this material.

In the stencil printing plate according to the second aspect, the decolorizable ink has a pH of at least 7 to 7.
It may have one or two or more kinds of colorants having a discoloration region at pH 10 and developing color on the alkaline side, a polyhydric alcohol and sodium carbonate.

By using the ink of this composition,
While a clear imprinted image is obtained at the time of imprinting, after a lapse of a predetermined time, the ink absorbs carbon dioxide gas in the air and the pH of the ink changes to the acidic side and the color disappears.

In the stencil printing plate according to claim 3, the decolorizable ink is added to the decolorizable ink used in the stencil printing plate according to claim 2 as a dissolution accelerator. And an activator may be added.

In the ink of this composition, the action of the dissolution accelerator makes it easier to dissolve the colorant and sodium carbonate in the ink composition. Moreover, the action of the activator improves the outflow of the ink.

Further, in the stencil printing plate according to the fourth aspect, the decolorizable ink has a pH of at least 7 to 7.
It may have one or more colorants having a color change region at pH 10 and developing color on the alkaline side, and cyclodextrin and its derivatives.

In the ink of this composition, the density and color of the imprinted image are changed by the action of cyclodextrin and its derivative.
It is less susceptible to the acidity of the stamp surface.

Further, in the stencil printing plate according to claim 4, the erasable ink is at least one kind of CI Acid Red 51, 87, 92, or 94, or at least two kinds of dyes. , Polyalkylene glycol may be contained.

Each layer of the impregnated body may be formed of the same material.

By using the ink of this composition,
While a clear imprinted image is obtained at the time of imprinting, after a lapse of a predetermined time, the dye chemically changes due to the action of light or heat and the color disappears.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, a stamp body 1 having a master plate for stencil printing according to the present embodiment is fixedly connected to a grip portion 2 for gripping by hand and the grip portion 2. The stamp portion 3, the skirt member 6 covering the outer peripheral side of the stamp portion 3, and the protective cap 7 detachably attached to the stamp portion 3.

The grip portion 2 is made of a metal or a synthetic resin material, and is composed of a rectangular parallelepiped hollow body having an open lower end, and a recess 1 for attaching the label 10 to the top thereof.
1 is formed. Front wall 12 and rear wall 1 of the grip portion 2
A pair of engaging claws 14 projecting downward are provided at the lower ends of the respective 3. Further, guide grooves 15 are formed in the lower portions of the front wall 12 and the rear wall 13 of the grip portion 2, and the front wall 1
2, an engaging concave portion 16 is formed, an engaging hole 18 is formed in the left side wall 17, and a spring supporting portion 20 is formed in the central portion of the lower surface of the upper wall 19 inside the grip portion 2. .

The stamp part 3 is composed of a stamp part body 4
This stamp part body 4 is inserted and fixed from below, covers the upper approximately 2/3 part of the outer peripheral side of the stamp part body 4, and engages with the four engaging claws 14 of the grip part 2. And an outer circumference holding member 5 fixed to the grip portion 2. The stamp body 4 corresponds to the original plate for stencil printing of the present invention.

The stamp body 4 has a shallow concave portion 25 on the lower surface side, and is a rectangular parallelepiped hollow hollow synthetic resin base member 2.
6, the impregnated body 27 mounted in the recess 25 of the base member 26 and impregnated with ink, the lower surface of the impregnated body 27 and the outer peripheral side of the base member 26, and the outer periphery of the base member 26 with the adhesive 29. And a heat-sensitive stencil sheet 28 adhered to the surface. The impregnated body 27 is fixed to the base member 26 with an adhesive or the like.
May be bonded to the concave portion 25.

Since the base member 26 comes into contact with ink, a synthetic resin material having excellent solvent resistance (for example, vinyl chloride, polypropylene, polyethylene, polyacetal, or the like) is used.
It is made of polyethylene terephthalate or the like) or a metal material. By mounting the impregnating body 27 in the recess 25 of the base member 26, it is possible to prevent the impregnating body 27 from being displaced, and
It is possible to prevent the ink from flowing out.

The impregnated body 27 is made of an elastic foam or non-woven fabric of a synthetic resin material (for example, polyethylene, polypropylene, polyethylene terephthalate, polyurethane, acrylonitrile butadiene rubber, etc.),
It has a two-layer structure with different densities. The first impregnation layer 27a having a high density is provided on the heat-sensitive stencil sheet 28 side, and the second impregnation layer 27b having a low density is provided on the concave portion 25 side of the base member 26. The respective densities differ depending on the type of ink to be impregnated, but the first impregnation layer 27a has a density of 100 to 800.
kg / m ^3, a second impregnation layer 27b is suitably about 40~240kg / m ^3. However, the density of the first impregnated layer 27a is selected to be higher than the density of the second impregnated layer 27b. The impregnation body 27 is impregnated with ink in a saturated state, and when pressure is applied to the impregnation body 27, the ink oozes out. Further, the first impregnated layer and the second impregnated layer are partially adhered by an adhesive or the like.
The first impregnated layer and the second impregnated layer may be adhered to each other by a heat-welding process, or, without adhering, a process such as providing unevenness on the joint surface of each layer is performed to form each layer. The deviation may not occur.

As shown in FIG. 6, the heat-sensitive stencil sheet 28 comprises a thermoplastic film 30, a porous support 31 and
And an adhesive layer 32 for adhering them. The thermoplastic film 30 is made of a thermoplastic synthetic resin material (for example, polyethylene terephthalate, polypropylene, or vinylidene chloride) having a thickness of 1 to 4 μm, preferably 2 μm.
(A vinyl chloride copolymer).

Those having a thickness of less than 1 μm are not practical because they are expensive to manufacture, weak in strength and lacking in practicality. Further, those having a thickness of 4 μm or more cannot be perforated by a general thermal head having a rated output of about 50 to 300 mJ / mm ² because they are too thick.

The porous support 31 is made of natural fibers (eg, Manila hemp, kozo, mitsumata, etc.), synthetic fibers (eg, polyethylene terephthalate, polyvinyl alcohol, polyacrylonitrile, etc.), or semi-synthetic fibers such as rayon. It is composed of porous thin paper whose main raw material is.

As shown in FIG. 7, with the base member 26 turned upside down, the impregnating body 27 is mounted in the recess 25, and then the impregnating body 27 is impregnated with ink. Next, the heat-sensitive stencil sheet 28 is covered on the impregnated body 27 so that the porous support 31 is on the impregnated body 27 side, and the heat-sensitive stencil sheet 28 is brought into close contact with the surface of the impregnated body 27. Then, the outer peripheral side portion of the heat-sensitive stencil sheet 28 is tightly folded onto the outer peripheral surface of the base member 26 and adhered by the adhesive layer 29 to form the stamp portion main body 4 shown in FIG. 7.

A portion of the heat-sensitive stencil sheet 28 that is in close contact with the surface of the impregnated body 27 (the lower surface in FIG. 5) constitutes a stamp surface portion 33. As described above, since the outer peripheral side portion of the heat-sensitive stencil sheet 28 is bonded to the outer peripheral surface of the base member 26, the stamp surface portion 3 covering almost the entire lower surface of the stamp portion 3 is used.
3 can be formed. As a result, the positioning at the time of printing can be easily performed.

In order to bond the outer peripheral side portion of the heat-sensitive stencil sheet 28 to the outer peripheral surface of the base member 26, an adhesive layer 29 is previously formed on the outer peripheral side portion of the heat-sensitive stencil sheet 28. Alternatively, the adhesive layer 29 may be formed in advance on the outer peripheral surface of the base member 26. Further, the adhesive layer 29 may be formed in advance on both the outer peripheral side portion of the heat-sensitive stencil sheet 28 and the outer peripheral surface of the base member 26.

As shown in FIGS. 2 to 4, the outer peripheral holding member 5 includes a peripheral wall portion 34, which is rectangular in plan view, to which the stamp portion main body 4 is fitted and adhered, an upper wall portion 35, and an upper wall portion 35. A pair of left and right engaging wall portions 3 protruding from the wall portion 35 by a predetermined height
6. The pair of left and right engagement wall portions 36 have engagement holes 37 corresponding to the four engagement claws 14 of the grip portion 2.
Are formed. The pair of left and right engaging wall portions 36 are formed in the pair of left and right rectangular holes 42 of the upper wall portion 41 of the skirt member 6,
It is slidably inserted vertically from below. The four engaging holes 37 of these engaging wall portions 36 are engaged with the four engaging claws 14 from above, and the upper end of the engaging wall portion 36 is brought into contact with the lower end of the grip portion 2 so that the outer circumference The holding member 5 is fixed to the grip portion 2.

As shown in FIGS. 2 to 4, the skirt member 6 includes an outer peripheral wall portion 40 having a rectangular shape when seen in a plan view, into which the outer peripheral wall portion 34 of the outer peripheral holding member 5 is slidably fitted in the up-down direction. The upper wall portion 41, which is the upper wall portion 41 at the upper end and is located above the upper wall portion 35 of the outer circumference holding member 5, and the inside of the grip portion 2 that protrudes from the central portion of the upper wall portion 41 to a predetermined height above. It is composed of a gate-shaped portion 43 to be inserted into the gate-shaped portion, a spring support portion 45 protruding from the center of the upper end of the gate-shaped portion 43, and the like.

Guide holes 44 are formed in the lower portions of the left and right walls of the gate-shaped portion 43 at positions corresponding to the guide holes 18 in the front-rear direction so as to penetrate the both wall portions.

A compression spring 21 for urging the skirt member 6 downward is attached to the grip portion 2 on the spring support portion 20 of the grip portion 2 and the spring support portion 45 of the skirt member 6. 6 is configured to be movable up and down over a first position shown in FIGS. 3 and 4, a second position shown in FIG. 9, and a third position shown in FIG. Therefore, the skirt member 6 is biased toward the first position by the spring 21. The outer peripheral wall 4 of the skirt member 6 is used for attaching and detaching the protective cap 7 and for positioning the stamp face portion 33.
The lower end portion of the central portion of the four surfaces of No. 0 is partially cut out.

In the first position, the upper wall portion 41 of the skirt member 6 is in contact with the upper wall portion 35 of the outer peripheral holding member 5,
The lower end of the skirt member 6 projects lower than the stamp face portion 33. Further, in the second position, the upper wall portion 41 of the skirt member 6 is located between the upper wall portion 35 of the outer peripheral holding member 5 and the lower end of the grip portion 2, and the lower end of the skirt member 6 is the stamp surface portion. It is located at the same level as 33. Further, in the third position, the upper wall portion 41 of the skirt member 6 hits the lower end of the grip portion 2, so that the lower end of the skirt member 6 is located above the stamp face portion 33. The stroke of the skirt member 6 from the first position to the second position is preferably set to about 5 mm.

The protective cap 7 is made up of the stamp body 4
It is for protecting the lower end side of the
The outer peripheral wall portion 48 and the outer peripheral wall 34 of the outer peripheral holding member 5,
The protective cap 7 is formed so as to have the same shape when seen in a plan view, and is fitted and supported by the outer peripheral wall portion 40 of the skirt member 6.

As shown in FIGS. 3 and 4, the protective cap 7
Since the upper end of the protective cap 7 abuts the lower end of the outer peripheral wall 34, there is a small gap between the protective cap 7 and the stamp face portion 33, and the protective cap 7 is attached to the outer peripheral face of the outer peripheral wall portion 48 and the skirt member. 6 is supported by the frictional force between the inner peripheral surface of the outer peripheral wall 40. Therefore, even if the grip portion 2 is pushed and moved downward with the protective cap 7 attached, the upper end of the protective cap 7 and the lower end of the outer peripheral wall 34 come into contact with each other, so that the gap is maintained. Ink does not adhere.

For example, as shown in FIG. 8, a large number of perforations (dots) of a pattern consisting of a character string of mirror characters of "confidential" and a six-fold rectangular frame surrounding the outside of the character string are formed on the stamp surface 33. Pattern perforation) is formed by a thermal head of a thermal printer (not shown), and a stamp body capable of printing a character string of "confidential" which is a mirror image of the pattern of FIG. 8 and a six-fold rectangular frame is formed. The pattern can be printed, for example, about 1000 times, like a normal stamp having a rubber stamp surface. It should be noted that the perforation is not only performed by the thermal head, but can be easily realized by infrared irradiation.

When punching the heat-sensitive stencil sheet 28 constituting the stamp surface portion 33, the stamp body 1 is set in the punching mounting portion of a heating punching device (not shown) and then punched. When not in use, the protective cap 7 is attached to hold the skirt member 6 in the first position as shown in FIGS. 3 and 4. When printing, the protective cap 7 is removed, the skirt member 6 is held at the first position, and the skirt member 6 is positioned at the position to be printed on the front surface of the paper. After positioning 33, the grip portion 2 is pressed downward for printing.

Next, the ink used in the present invention will be described. The decolorizable ink of the present invention is impregnated in the impregnated body 27 in the stamp portion main body 4.

Various compositions are known to realize a decolorizable ink, and specific examples thereof will be described below.

[0050]

EXAMPLES For example, in the case of using a coloring agent having a color change region at pH 7 to pH 10 and coloring on the alkali side,
It is as follows.

Ink composition example 1 parts by weight o-cresolphthalein 1 ethylene glycol 30 sodium carbonate 7 water 60 When a stamp is made using the ink prepared by the above composition, the initial ink composition is alkaline. In addition, the coloring agent o-cresolphthalein is colored, but the fact that sodium carbonate in the ink composition absorbs carbon dioxide in the air and neutralizes it, so that it becomes colorless, Realizes decolorizable ink. In this example, the time required for erasing is about 70 hours.

Ink composition example 2 parts by weight o-cresolphthalein 1.3 ethylene glycol 10 sodium carbonate 4.5 ethyl cellosolve 30 Neugen P (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) 0.1 water 60 In the case of stamping with, the solubility of o-cresolphthalein is improved by the action of the dissolution promoter ethyl cellosolve. In addition, the action of Neugen P (manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), which is an activator, makes the outflow of ink good. With this composition, about 2
The color disappears after 0 hour.

Ink Composition Example 3 Part by Weight CI Acid Red 92 1.6 PEG 20000 2 Ethylene Glycol 20 Proxel GXL (ZENECA) 0.2 Water 76.2 In the ink prepared with the above composition, ether oxygen in the polyethylene glycol molecular chain is used. However, it is said that it forms an association with the dye molecule, and the polyethylene glycol molecule is cleaved from that part by the action of light or heat, and the dye molecule is excited by its energy to cause a chemical change. There is.

Ink composition example 4 parts by weight Phenolphthalein 2 Ethanol 20 Sodium carbonate 5 α-Cyclodextrin 10 Water 63 In the ink prepared by the above composition, the pH indicator is included as a guest by the inclusion function of cyclodextrin,
It is less susceptible to the acidity of the surface of the stamp. However, as in Composition Example 1, a decolorizable ink is realized by gradually absorbing carbon dioxide and making the pH indicator colorless. In this example, the time required for erasing is about 6 days.

Although examples of various decolorizable ink compositions are described above, the inks usable in the present invention are not limited to these, and decolorizable inks having various compositions can be used. is there.

[0056]

As is apparent from the above description, since the stencil printing plate according to claim 1 of the present invention uses the decolorizable ink, the necessary period for leaving the stamp is completed. If you do, the imprint will disappear. For this reason, the stamped image does not become an eyesore when the stamped material is put into a file.

Further, the stencil printing plate according to claim 2 has a discoloration region at least at pH 7 to pH 10, one or more kinds of colorants that develop color on the alkaline side, polyhydric alcohol and sodium carbonate. Since it uses decolorable ink consisting of and, it absorbs carbon dioxide gas in the air
Changes to acidic and disappears.

Further, the stencil printing plate according to claim 3 has a discoloration region at least at pH 7 to pH 10, and one or more kinds of colorants that develop color on the alkaline side, a polyhydric alcohol and sodium carbonate. Since the dissolution accelerator and the activator are further added to the ink composed of (1) and (2), the solubility of the colorant is improved and the outflow of the ink is improved.

Further, the stencil printing plate according to claim 4 has a discoloration region at least at pH 7 to pH 10, and contains one or more kinds of colorants that develop color on the alkaline side, and cyclodextrin and derivatives thereof. Therefore, the density and color of the imprint image are not easily affected by the acidity of the target surface of the stamp.

Further, the stencil printing plate according to claim 5 has at least CI Acid Red 51, CI Acid Red 87 and CI Acid Red 51.
Since it contains one or two or more dyes of No. 2 or 94 and polyalkylene glycol, when this ink is used, a clear imprinted image is obtained at the time of imprinting, but when a predetermined time elapses, light or heat is applied. By the action of, the dye chemically changes and disappears.

[Brief description of drawings]

FIG. 1 is a perspective view of a stamp body of a stamp device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a stamp body.

FIG. 3 is a vertical sectional front view of a stamp body.

FIG. 4 is a vertical sectional side view of a stamp body.

FIG. 5 is an enlarged vertical sectional front view of a stamp body of the stamp body.

FIG. 6 is an enlarged sectional view of a heat-sensitive stencil sheet of a stamp body.

FIG. 7 is a perspective view illustrating a method for manufacturing a stamp portion main body.

FIG. 8 is a diagram showing an example of a pattern for punching a stamp face of a stamp body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 stamp body 2 gripping part 3 stamp part 4 stamp part main body 26 base member 27 impregnation body 27a first impregnation layer 27b second impregnation layer 28 heat-sensitive stencil sheet 33 marking surface portion

Claims (5)

[Claims] 1. A base member connectable to a gripping portion for grasping by hand, an impregnated body fixed to the lower surface of the base member and impregnated with ink, and a surface of the impregnated body is fixedly covered. A master plate for stencil printing, comprising a heat-sensitive stencil base paper constituting a printing surface portion, wherein the ink has a decolorizable composition. 2. The decolorizable ink is at least pH.
The master plate for stencil printing according to claim 1, wherein the stencil printing plate comprises a polyhydric alcohol and sodium carbonate, which has one or more colorants having a discoloration region at pH 7 to 10 and which develops color on the alkaline side. . 3. The stencil printing plate according to claim 2, wherein the decolorizable ink contains a dissolution accelerator and an activator. 4. The decolorizable ink is at least pH.
The stencil printing plate according to claim 1, wherein the stencil printing plate has a discoloration region at pH 7 to 10 and contains one or more kinds of colorants that develop a color on an alkaline side, and cyclodextrin and a derivative thereof. 5. The decolorizable ink is at least CI.
The stencil printing plate according to claim 1, which contains one or more dyes of Acid Red 51, 87, 92, or 94 and polyalkylene glycol.