JPH1191221A - Base board for plate-making - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an unnecessary marking from arising and dust and dirt from adhering to the surface of a base board for plate-making. SOLUTION: For this base board for plate-making of a porous stamp having continuous air bubbles, on the upper surface of a supporting plate 23 made of non-woven fabric, a porous sheet 24 wherein after mixing a flexible synthetic resin material such as an urethane based resin, and at least an air bubble forming agent, only the air bubble forming agent is removed by melting, is formed, and on the upper surface of the porous sheet 24, a thin protective sheet 25 having light permeability is temporarily affixed in advance. By this constitution, when a finished base board for plate-making is wound into a coil-form, there is no trouble such as a marking of the uneven surface of the non-woven fabric as the supporting plate 23 onto the surface of the porous sheet 24 which is covered with the protective sheet 25, the adhesion of the fiber of the non- woven fabric and the adhesion of other dust, and an effect wherein the following plate-making work can be surely performed can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a plate-making substrate for producing a stamp plate, and more particularly, to a plate-making substrate made of a porous sheet having open cells and impregnated with stamp ink. It is related to the structure of.

[0002]

2. Description of the Related Art Conventionally, various printing devices such as stamps have been used to print desired images such as pictures and characters on a print medium such as a postcard. Of these, JP-A-7-285
In the publication No. 258, on the surface of a plate-making substrate made of a porous sheet having open cells and impregnated with stamp ink,
A printing plate having a printing surface formed of an ink bleeding portion that becomes a mirror image of a desired imprint original and an ink non-bleeding portion that closes the open cells is used, and plural colors of ink are directly applied to the ink bleeding portion of the printing plate. A multicolor stamping method has been proposed in which the printing is performed by pressing a printing medium such as a postcard on the surface of the stamp surface after printing.

[0003] This publication also discloses a method for producing a printing plate (plate making method) in which carbon black and high-performance black paper are applied to the surface of a porous sheet (substrate for plate making) that has open cells and can be impregnated with stamp ink. A heating sheet made of at least one heat-absorbing material selected from the group consisting of molecular substances is overlapped, and an original sheet having the desired imprint is overlapped thereon so as to be a mirror image. In a state where the wide surface of the flexible sheet (plate making plate) is compressed, light including infrared rays is irradiated from the document sheet side by flash light of a flash valve or the like, and a heating plate corresponding to a portion other than the imprint of the document generates heat. Thus, the surface of the porous sheet is melted to form an ink non-exuding portion, while the surface of the porous sheet corresponding to the imprint portion of the original is not melted, and the ink exuding portion is left with the pores exposed. The method of formation have been proposed.

When light irradiation and heating are performed in a state where the wide surface of the porous sheet is pressed (compressed state), open cells communicating with pores exposed on the surface of the porous sheet are heated in a crushed state. This is because the soft synthetic resin is melted, the pores on the surface and the continuous bubbles in the layer in the vicinity thereof disappear, and a so-called ink non-exuding portion where ink does not pass can be easily formed. Further, since the resin is solidified in a state where the open cells are crushed by the cooling after the melting, the surface of the ink non-exuding portion has a lower surface height than the ink exuding portion.

[0005] When the thickness of the porous sheet is large, the pores on the surface and the open cells in the layer in the vicinity thereof are crushed, and an external force for pressing the resin portions until they adhere to each other, That is, the external force applied to the pressing plate must be considerably increased. This is because, when a pressing force is applied to the sponge-like porous sheet and the porous sheet is compressed in the thickness direction, the thickness is reduced substantially uniformly in the thickness direction. Also, it does not shrink so that only the open cells in the layer near it and the layer near it are crushed first.
In other words, in order to shrink so that the open pores of the surface pores and the layer in the vicinity thereof are crushed, it is necessary to shrink so that the open cells are crushed even in the middle part in the thickness direction of the porous sheet, Therefore, upon light irradiation (heating), a large external pressing force is required to be applied to the porous sheet having a large thickness dimension, and there has been a problem that the structure of the plate making apparatus must be considerably rugged.

In order to solve this problem, simply reducing the thickness of the porous sheet causes the rigidity (strength of the sheet) of the sheet to decrease.
And the handling of the plate as a plate making substrate becomes extremely troublesome, the holding property of the ink is reduced, and the work of adhering the ink must be frequently performed. Therefore, the present applicant has proposed that the back side of the thin porous sheet is supported by a slightly hard nonwoven fabric, thereby reducing the thickness of the portion of the porous sheet while maintaining the rigidity of the entire plate-making substrate. To improve the handling of the ink and to improve the holding property of the ink.

[0007]

However, in order to mass-produce such a plate-making substrate, it is necessary to unwind a non-woven fabric as a support for a porous sheet while winding the non-woven fabric on one side of the non-woven fabric. After drying the porous sheet adhered to it, it is wound again in a coil shape, so that the back surface of the nonwoven fabric adheres to the surface of the wound porous sheet, and the porous sheet is When unwound and seen, the surface is engraved with a random uneven surface according to the surface of the nonwoven fabric, or the state where fiber waste of the nonwoven fabric is attached,
There has been a problem that it becomes inconvenient as a plate-making substrate.

An object of the present invention is to solve this problem and to provide a plate-making substrate having a clean and smooth surface.

[0009]

According to a first aspect of the present invention, there is provided a plate-making substrate according to the first aspect of the present invention, which is a plate-making substrate for a porous stamp having open cells, wherein one side of a nonwoven fabric is provided. A porous sheet made of a soft synthetic resin material such as a urethane-based resin is formed, and a thin protective sheet having a light-transmitting property is temporarily attached to the upper surface of the porous sheet.

[0010] The invention described in claim 2 is the same as the claim 1.
Wherein the double-sided adhesive tape is attached to one surface of the nonwoven fabric opposite to the surface on which the porous sheet is formed.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described. FIG. 1 is a cross-sectional view of a plate making apparatus used for manufacturing a plate for making a plate, and for manufacturing a stamp using the plate for a plate.
2 is a perspective view of the tray, FIG. 3 is a side sectional view of the tray, and FIG.
Is a cross-sectional view of a plate making apparatus in which a tray is inserted into a main body to a predetermined position and in which plate making operation is possible, and FIG. 6 is a perspective view of a plate making plate and the like.

The plate making apparatus used in the present invention is a box-shaped main body 1 having an upper surface opening 1a and a side opening 1b on the front side.
A lid 2 attached to the rear side of the main body 1 via a horizontal shaft 4 so as to be vertically rotatable and capable of opening and closing with respect to the upper surface opening 1a; and a main body 1 through the side surface opening 1b. The main body 1, the lid 2 and the tray 3 are formed of a synthetic resin material or the like.

As shown in FIGS. 2 and 3, the tray 3
Base 31 and pressing plate 3 made of a transparent material such as acrylic resin
2 and an engaging body 33, and a substantially rectangular projecting frame portion 34 having a substantially rectangular shape in a plan view is formed integrally with a substantially central portion of the upper surface of the flat substrate 31. The base 31 and the engagement body 32 are made of an opaque material. A pivot pin 36 at the base of the pressing plate 32 is rotatably mounted on the base 31, and is shown in FIGS.
As shown in FIG. 1, a pressing plate 32 is mounted on the base 31 so as to be able to open and close vertically. An engaging body 33 is attached to a handle portion 31a formed on one end side of the base 31 so as to be vertically rotatable via a pivot pin 37. At the time of plate making, the frame portion 34 is attached to the frame portion 34. A plate-making substrate 10 described later and a document sheet 11 cut into a substantially rectangular shape in a plan view having substantially the same size as the outer edge of the document are overlapped, and a pressing plate 32 is placed on them in a parallel manner.

The free end side of the pressing plate 32 is shown in FIGS.
As shown in (1), an upwardly convex curved (kamaboko-shaped) projection 32 having a width H1 smaller than the width of the pressing portion 32b and larger than the plate thickness of the pressing portion 32b is integrally formed. On the other hand, the pair of left and right pivot pins 3 is
A substantially rectangular insertion hole 33b is formed upward from the inside of 7, 37 (only one is shown in the figure). This insertion hole 3
The width dimension of 3b is formed wide enough to allow the protrusion 32 of the pressing plate 32 to pass through. As shown in FIGS. 1 and 3, a downwardly protruding engaging portion 33a is integrally formed at the upper end of the inner surface of the insertion hole 33b, and the lower end of the inner surface of the insertion hole 33b is described later. Such a push-up portion 33c is integrally formed.

Accordingly, the pressing plate 32 is put on the plate making substrate 10 and the original sheet 11 in a state of being laminated on the upper surface of the base 31,
Next, an operation of raising the engagement body 33 to a substantially vertical shape (FIG. 3)
Of the insertion hole 33 in the direction of arrow A).
The point b passes above the protrusion 32a, and the downward engaging portion 33a of the insertion hole 33b engages at the root of the protrusion 32a, thereby pressing the pressing plate 32 against the upper surface of the base 31. Then, the pressing plate 32 is kept in the lying position, and can be pressed toward the base 31 by the pressing plate 32 in a state where the plate making substrate 10 and the document sheet 11 are stacked. The magnitude of the pressing force at this time is
The compression ratio (the ratio of the thickness of the plate making substrate 10 before compression divided by the thickness of the plate making substrate 10 after compression) is designed to be 1.1 to 1.6.

The engaging body 33 is provided with the insertion hole 3.
3b, when the engaging body 3 is raised upright in a substantially vertical state, the protrusion 32
A light-shielding piece 33d is formed integrally so as to substantially cover the area above "a". The width H2 of the light shielding piece 33d may be shorter than the width H1 of the protrusion 32a (see FIG. 2) or may be formed longer. The light-shielding piece 33d is connected to the base 31 via the engaging body 33 as described later.
With the pressing plate 32 being pressed upward, most of the base 31 of the tray 3 is inserted into the side opening 1b of the main body 1 to flash the flash valve 14 as a light source. Are emitted upward into the air via the convexly curved projections 32a exerting the effect of (1). Therefore, if the light-shielding piece 33d is not provided, there is an effect that the flash directly enters the user's eyes and feels dazzling.

As shown in FIG. 1, FIG. 4 and FIG. 5, in the hollow main body 1, there is arranged a hollow substantially square trapezoidal mantle 12 whose upper and lower surfaces are open. When the tray 3 is inserted by a predetermined depth from the side opening 1 b of the main body 1, the inner diameter side of the frame 34 is set to be below the mantle 12. Further, a socket 13 for supporting an electrode portion of a horizontal flash bulb 14 as a light source is provided on the lower surface side of the lid 2. An umbrella plate 15 for covering the upper open surface of the mantle 12 and preventing the lid 2 from being overheated is provided between the upper surface of the horizontal flash valve 14 mounted on the socket 13 and the lower surface of the lid 2. Fixed. It is preferable that the lower surface of the umbrella plate 15 and the inner surface of the mantle 12 have a reflection surface having an appropriate light reflectivity, and the umbrella plate 15 is made of a synthetic resin lid 2.
It is preferable to use a material having a high heat dissipation rate that can prevent overheating. In the embodiment, the umbrella plate is made of galvanized steel sheet, the mantle 12 is made of ABS resin or polycarbonate resin, and at least the inner surface (the side where the flash valve 14 is inserted) of the mantle 12 is nickel-chrome plated by electroless plating or electrolytic plating. Form a chrome plating layer,
A light reflection layer is formed by metallizing by vapor deposition of aluminum or silver, so that the light reflectance is higher than that of the umbrella plate 15.

The used flash valve 14 and a new flash valve 14 can be replaced by opening the lid 2 widely (90 degrees or more) as shown in FIG. A notch 12a facing downward is formed on one side of the upper end of the mantle 12 (the side close to the socket 13), and is attached to the socket 13 when the lid 2 is closed in a solid line state in FIG. The horizontal flash valve 14 is configured so that the flash valve 14 faces the mantle 12 through the cutout portion 12a.

On the lower surface of the lid 2, there is provided a housing 17 for a dry battery 16 as a power source for causing the flash valve 14 to flash (emit light), and a switch 18 as a switch means comprising a contact member inside. Is provided downward. When the tray 3 is inserted by a predetermined depth from the side opening 1b of the main body 1, a button portion 31b protruding from the tip of the base 31 of the tray 3 is provided on the side of the switch case 19 by a switch. Rushing into the interior through the hole 19a,
When the switch 18 is turned on, the flash valve 1 is turned on.
4 can be made to flash (light emission).

In the embodiment, as a locking means for locking the main body 1 and the lid 2 so that the main body 1 and the lid 2 cannot be opened, in the present embodiment, the main body 1 is laterally screwed to the side wall 1c on the front side (the insertion side of the tray 3). (See FIGS. 1, 4 and 5). With the top surface opening 1a of the main body 1 covered so as to cover the lid 2, the head 20
When approaching (screw-in) so that a contacts the side wall 1c,
A locking bolt 20 is inserted into a locking hole 21 formed in the side plate of the lid 2.
Are fitted so that the lid 2 cannot be opened (see the solid lines in FIGS. 1 and 4). Conversely, the direction in which the locking bolt 20 is loosened (the head 20a is
(In the direction away from the lock bolt 20), the shaft portion of the locking bolt 20 is disengaged from the locking hole 21 and the lid 2 can be opened (see the two-dot chain line state in FIG. 1).

Further, the head 20a of the locking bolt 20
Is separated from the side wall 1c, the side opening 1
b, the rising side wall 31c of the handle of the tray 3 to be inserted into the tray 3 abuts on the protruding head 20a and does not allow the tray 3 to enter any more.
4, the tray 3 can be inserted deep into the main body 1 as shown in FIG. 4, and the inner surface of the rising side wall 31c of the tray 3 can be inserted into the head 20a. Insert until it abuts,
The button portion 31 b protruding from the tip of the tray 3 can enter the switch hole 19 a in the switch case 19 to turn on the switch 18.

Here, the position at which the tray 3 is inserted (inserted) into the main body 1 until the button portion 31b protruding from the tip of the tray 3 can turn on the switch 18 is determined by the position of the tray 3. The button portion 31b is referred to as a position where a predetermined mounting posture with respect to the main body 1 is allowed.
The state in which the tray 3 enters (inserts) such that the tray 3 does not reach the main body 1 is referred to as a position where a predetermined mounting posture of the tray 3 with respect to the main body 1 is not allowed.

Therefore, the locking bolt 20 as the locking means
Depending on the position of the head 20a, the position where the tray 1 can be inserted into a predetermined position and the position where the tray 1 is not permitted can be selected, and when the tray 3 is inserted to the predetermined position, the switch 18 is automatically operated by the button portion 31b. The flash valve 14 can be flashed by being turned on. After executing the flash operation, the flash valve 1
In order to open the lid 2 for replacement of the tray 4, the tray 3 is pulled out widely, and then the locking bolt 20 is turned so that the head 2
0a needs to be moved to a position far away from the side wall 1c of the main body, and the operation takes several seconds or more. During this time, the flash valve 14 which has flashed is naturally cooled. The used flash valve 14 can be safely removed from the device.

As another embodiment of the locking means instead of the locking bolt 20, a clamping mechanism having a pivoting jaw (Japanese Utility Model Publication No. 44-5225, Japanese Utility Model Publication No. 44-5227)
(See Japanese Unexamined Patent Application Publication). On the other hand, the switch 18 and the switch case 19 may be provided on the main body 1 in a fixed position. However, as in the above-described embodiment, the switch 2 and the switch case 19 are provided on the rotating lid 2 so that the lid 2 The switch 18 and the switch case 19 are located at predetermined positions only when the switch
Is inserted into the switch 18 through the switch hole 19a when the button 3 is inserted, in other words, as long as the cover 2 is not closed in a predetermined position, the tray 3 is placed in the main body 1 at a predetermined position. By adopting a configuration in which the switch cannot be turned on even when the flash valve 14 is inserted up to a certain point, it is possible to perform a useless flash operation of the flash valve 14 and to achieve a specific effect of preventing malfunction.

Next, the structure of the plate-making substrate 10 will be described. In the embodiment shown in FIGS. 6 to 8A, a support plate 23 made of a non-woven fabric or the like, having continuous cells, and being capable of being impregnated with stamp ink. A porous sheet 24 in which carbon black or a light energy-absorbing substance is dispersed and contained in a material having a high porosity; and a transparent protective sheet 25 such as a PET film disposed on the surface side of the porous sheet 24. And the porous sheet 24 is made of a polyolefin resin,
It is made by mixing a soft synthetic resin material such as polyvinyl chloride resin or polyurethane resin and at least a bubble forming agent to form a thin plate (thickness of about 0.4 mm to 1 mm), and then melting and removing only the bubble forming agent. Yes, it contains carbon black or a light energy attracting substance dispersed therein. Many small pores are exposed on the surface of the substrate 24. In the embodiment, when the thickness of the support plate 23 as a nonwoven fabric is about 1 mm, the porous sheet 2
The thickness of the protective sheet 25 is set to about 0.4 mm, and the thickness of the protective sheet 25 is set to about 0.1 mm.

In the plate-making substrate 10 of another embodiment shown in FIG. 9, a support plate (nonwoven fabric) 23 is stuck on the back surface of a porous sheet 24 on which a protective sheet 25 is temporarily stuck. A double-sided adhesive tape 50 is provided on the back surface of the plate (nonwoven fabric) 23.
Is attached. The configuration of the double-sided adhesive tape 50 is, as is well known in the art, such that the adhesive layer 50c provided on the other surface of the adhesive tape 50b having the adhesive layer 50a adhered to the back surface of the support plate 23, which is a nonwoven fabric, is applied to the release tape 50d. It is covered. As described above, if the double-sided adhesive tape 50 is a plate-making substrate 10 to which a double-sided adhesive tape 50 is previously adhered, when stamp printing is performed after plate-making, the adhesive tape 50b from which the release tape 50d has been peeled off can be easily placed on a stamp pressing base (not shown). Can be glued. In each of the above embodiments, the support plate 23
Is harder than that of the porous sheet 24.

FIG. 7 shows an example of a method of manufacturing these plate-making substrates 10. The unwinding of the support plate 23 wound in a coil shape is performed while the raw material (soft synthetic resin material) of the porous sheet 24 is formed on the upper surface thereof. ) And at least a foam-forming agent are applied in a gel form to a predetermined thickness, passed through a solution to melt and remove only the foam-forming agent, and then dried downstream to complete the bonding. . Next, while rewinding the coil-shaped protection sheet 25 on the downstream side of the conveyance,
The porous sheet 24 is temporarily attached to the upper surface. When the double-sided adhesive tape 50 is required, it may be attached to the lower surface of the support plate 23 as shown by the two-dot chain line in FIG.

The protective sheet 25 has a melting point higher than that of the soft synthetic resin material which is the material of the porous sheet 24. For example, the protective sheet 25 is made of the porous sheet 2
Melting point of 4 (about 120 for soft polyurethane resin)
C., about 70 ° C. for soft polyolefin resin) Transparent PET with a higher melting point (about 230 ° C.)
(Polyethylene terephthalate) resin films are preferred, and the thickness of each sheet is about 0.025 mm to 0.2 mm. The protective sheet 25 is used to prevent the plate making substrate 10 (the surface of the porous sheet 24) from being adhered to the surface of the original sheet 11 during the plate making operation. Is temporarily adhered, when the plate-making substrate 10 is wound into a coil shape as described above, it is ensured that the uneven shape of the nonwoven fabric as the support plate 23 is stamped on the surface of the porous sheet 24. Thus, the surface of the porous sheet 24 can be smoothed, and the fibers of the nonwoven fabric can be prevented from adhering to the surface of the porous sheet 24 and the dust can be prevented from adhering at the distribution stage or the like.

In the embodiment, the weight ratio of the carbon black or the light energy-absorbing substance contained in the porous sheet 24 is such that the content of the carbon black is 1.0% by weight to 1.5% by weight with respect to the polyurethane foamed resin. is there. The content of carbon black is not limited to this, and may be in the range of 0.1% by weight to 15% by weight. If the content of carbon black is more than 15% by weight, the surface of the porous sheet 24 itself becomes black, and the applied stamp ink cannot be identified in several colors.
Further, there is a disadvantage that it is impossible to determine whether or not the stamp ink has been applied. If the amount is less than 0.1% by weight, sufficient heat generation cannot be obtained, and the surface of the porous sheet 24 cannot be melted. In addition, examples of the light energy attracting substance include silver chloride and silver bromide.

Next, the plate making method will be described. A plate making substrate 10 in which carbon black or a light energy absorbing material is dispersed and contained in a porous material having open cells and impregnable with stamp ink. Is used, an original sheet 11 having an image portion 26 to be a mirror image of a desired character, figure, or the like is prepared on a light-transmitting sheet (film) in advance when making a plate. The original sheet 11
The method of manufacturing will be described later.

First, the original sheet 11 is placed on the outer peripheral edge of the frame portion 34 on the upper surface of the base 31 in the tray 3 such that the outer peripheral edge of the lower surface of the plate making substrate 10 is substantially along. After the image portion 26 is laminated so as to be in close contact with the surface of the protective sheet 25, the transparent pressing plate 32 is put over from above and rotated, and the engaging body 33 is raised substantially vertically to raise the pressing plate. 32 (see FIGS. 6 and 8).
(A)). In the case where the double-sided adhesive tape 50 is previously adhered to the back side of the support plate (nonwoven fabric) 23 on the plate making substrate 10 (see FIG. 9A), the double-sided adhesive tape 5 is used.
What is necessary is just to mount it, making the 0 side contact the upper surface of the base | substrate 31.

Next, as shown in FIG. 1, the lid 2 is opened, a new (unused) flash valve 14 is mounted on the socket 13, and then closed and rotated so as to cover the top of the main body 1. The locking bolt 20 is pushed forward, and the bolt shaft is fitted in the locking hole of the side plate in the lid 2. Then, the locking bolt 20 is advanced until the head 20a comes into contact with the outer surface of the side wall 1c of the main body 1.

Next, the tray 3 is inserted into the inside of the main body 1 from the front end side through the side opening 1b.
When the inner surface of the rising side wall 31c of the handle contacts the head 20a, the button 31b protruding from the tip of the tray 3 enters the switch hole 19a in the switch case 19 and turns on the switch 18. This causes the flash valve 14 to flash.

When the light is irradiated in this manner, the heating energy such as infrared light out of the light energy of the flash light is transmitted through the transparent pressing plate 32, the original sheet 11 and the protection sheet 25 to the porous sheet 24 of the plate making substrate 10. Reach the surface where the pores are exposed. Light energy that has passed through a portion (non-image portion) other than the image portion 26 on the document sheet 11 passes through the protection sheet 25 as it is (see FIG. 8A),
The carbon black near the surface (light-irradiated surface) corresponding to a portion (non-image portion) other than the image portion 26 on the plate making substrate 10 absorbs heat by the light energy, and the image line on the plate making substrate 10 is absorbed. The surface portion corresponding to a portion (non-image portion) other than the portion 26 is heated and melted, and then solidified, whereby pores on the surface are closed, and an ink non-exuding portion 27 having a predetermined thickness is formed (FIG. 8). (B) and FIG. 9 (b)).

On the other hand, the original sheet 11 is
Is black, the image area 26 is heated by the light energy irradiated from the direction of the pressing plate 32, and the temperature rises. However, the protection sheet 25 corresponding to the image area 26 has a thickness within the sheet thickness. Conducts heat in the horizontal direction. In other words,
The heat generated on the original sheet 11 side is absorbed and dispersed by the protection sheet 25, and the plate making substrate 1 corresponding to the image area 26 is formed.
The surface portion of 0 is not heated and becomes the ink exuding portion 28 with the pores exposed as the shape of the image portion 26. When the image portion 26 is other than black, light energy is cut off and reflected by the image portion 26, and the surface of the plate making substrate 10 corresponding to the image portion 26 is not heated and has pores. Is the exposed ink seeping portion 28.

Accordingly, when the protective sheet 25 and the original sheet 11 are removed from the wide surface of the plate making substrate 10 after the light irradiation, the original sheet 11 is removed as shown in FIGS. 8 (b) and 9 (b). The ink bleeding portion 28 is formed while the pores in the shape of the mirror image of the image portion 26 are exposed, and the ink non-bleeding portion 27 corresponding to the non-image portion forms the plate making substrate 10.
Can be made as a stamp with a predetermined stamped surface formed on the wide surface of the plate.

Preferably, the protective sheet 25 is formed by sandblasting the surface that comes into contact with the wide surface of the plate-making substrate 10 or by performing fine embossing or embossing to form the protective sheet 25 and the wide surface of the plate-making substrate 10. When the image area 26 of the original sheet 11 is made of black ink, the heat generated in the image area 26 is efficiently absorbed and dispersed by the protection sheet 25. Since the light is not transmitted to the surface direction of the plate making substrate 10, the pores in the shape of the mirror image of the image portion 26 remain exposed, and the effect of the edge of the imprint of the ink exudation portion 28 being sharpened is produced.

A plate-making substrate 10 in which a light energy absorbing substance such as carbon black is dispersed and contained in a porous material having open cells and impregnable with stamp ink.
The image portion 26 of the original sheet 11 is brought into direct contact with the surface of the original sheet (after the protective sheet 25 is peeled off) so that the original sheet 1
The above-described light irradiation may be executed from one side. In this case, the surface of the plate-making substrate 10 facing the image portion 26 is also heated and melted, and then solidified when the ink is exfoliated. At the time of peeling, the ink non-exuding portion is exfoliated according to the shape of the image portion 26, and the ink exuding portion 28 can be formed as per the seal imprint.

In another embodiment, the plate-making substrate 10 is constituted by a porous sheet that does not contain carbon black or a light energy-absorbing substance, has open cells, and can be impregnated with stamp ink. The material is the same as described above. In this case, as the heating sheet that comes into contact with the wide surface (the surface where the pores are exposed) of the plate-making substrate 10, a black pigment such as carbon black is previously mixed or printed on the surface. In this embodiment,
In the main heating operation, light irradiated from the transparent pressing plate 32 side passes through the original sheet 11, and in a portion corresponding to the non-image portion, the light is absorbed by the light energy absorbed by the black heating sheet, and the facing plate making is performed. Since the surface of the substrate 10 is once melted and solidified by the heat, it becomes an ink non-exuding portion 27 from which the stamp ink does not exude, and the light does not pass through the portion corresponding to the image portion 26.
The ink bleeding portion 28 remains with the pores in the shape of the mirror image of the image portion 26 in FIG. 1 exposed, and the plate can be made as a stamp with a predetermined stamped surface.

Next, a method of manufacturing a manuscript sheet made of the photochromic film 40 from the negative film 41 using the plate making apparatus will be described. As shown in FIG. 10A, a photochromic film 40 includes a protective sheet 40a serving as a base material thereof and a photochromic layer 45 formed on one surface (the upper surface in the embodiment) by coating or the like.
The protective sheet 40a is formed from the melting point of the material of the porous sheet in the above-described plate-making substrate 10 (about 120 ° C. for a soft polyurethane-based resin and about 70 ° C. for a soft polyolefin-based resin). High melting point (about 230
C.) is preferable, and a transparent PET (polyethylene terephthalate) resin film having the above-mentioned temperature is preferable, and a synthetic resin such as an ABS resin may be used.

The photochromic layer 40b as a thin layer (thin film) formed on the surface of the protective sheet 40a is made of an organic photochromic ink (manufactured by Teikoku Ink).
By impregnating or applying to the surface of Oa, it is formed with a substantially uniform thickness. This photochromic ink is usually colorless and transparent, and has a property of developing a blue color when irradiated with ultraviolet rays. Further, when the photochromic ink is irradiated with ultraviolet rays for a predetermined period of time after being cut off, the photochromic ink changes to colorless and transparent and returns to the state before the irradiation with ultraviolet rays.

The negative film 41 is a known negative film for black-and-white photography, and has a light-transmitting film substrate 41.
a, and a non-light-transmitting portion 41b formed of a reduced metal silver film after development formed on the surface thereof to form a desired negative image such as a human image. When a manuscript sheet is prepared, the engaging body 33 of the tray 3 taken out of the main body 1 is rotated counterclockwise in FIG. 3 to open the disengaged pressing plate 32 upward as shown in FIG. In the frame portion 34 on the upper surface of the base 31, a seat 35 made of a soft material such as a sponge material having a substantially same size as the outer edge of the frame portion 34 and having a substantially rectangular shape in a plan view is provided on the outer peripheral edge of the frame portion 34. Place so that they overlap. After laminating the photochromic film 40 thereon such that the photochromic layer 40b is on top and the non-light-transmitting portion 41b of the negative film 41 is in contact with the photochromic layer 40b, the pressing plate 32 is
Is rotated clockwise in FIG. 3 so that the protrusion 32a
The negative film 41 is brought into close contact with the photochromic film 40 by the pressing plate 32 by the engagement of the third engaging portions 33a. In this state, a light beam including ultraviolet rays UV from a light source such as sunlight or an ultraviolet lamp is irradiated from the side of the transparent pressing plate 32 as appropriate (see the state of FIG. 10B).

Due to the irradiation of the light, the ultraviolet rays UV in the light are blocked in the thick portion of the non-light-transmitting portion 41b of the negative film 41, but are blocked by the film substrate 41a and the light-transmitting portion having a small thickness. At 41b, the photochromic layer 40b passes through and is irradiated. As a result, the photochromic layer 40b irradiated with the ultraviolet rays UV has a non-light-transmitting portion 4 such as a blue color.
0c, and if only the photochromic film 40 is taken out from the tray 3, the negative film 4
An original sheet 11 is formed in which a positive (positive) image is formed by inverting one black-and-white negative image (see FIG. 10C).

As described above, if an appropriate time elapses after the ultraviolet rays UV are cut off, the non-light-transmitting portion 40c returns to the original photochromic film 40 which becomes the colorless and transparent photochromic layer 40b. Is reusable and economical. As the document sheet, an ultraviolet curable film may be used instead of the photochromic film 40. The ultraviolet-curable film is formed by forming a protective sheet and a thin ultraviolet-curable resin layer on one surface thereof with a substantially uniform thickness, and the protective sheet is made of a material of the porous sheet in the plate-making substrate 10 described above. A transparent PET (polyethylene terephthalate) resin film having a melting point (about 230 ° C.) higher than the melting point (about 120 ° C. for a soft polyurethane-based resin and about 70 ° C. for a soft polyolefin-based resin) is preferable. The UV-curable resin layer contains oligomers and monomers such as polyester acrylate and a benzophenenoin-based photopolymerization initiator as main components, and has a property of being cured by UV irradiation. Note that a non-transparent colorant such as black, gold, silver, or white is mixed or applied to the ultraviolet curable resin layer in advance.

In substantially the same manner as the above-mentioned original sheet, the tray 35, the ultraviolet curing film, the negative film 4
When the ultraviolet rays are irradiated by a light source such as sunlight or an ultraviolet lamp in a state where these are pressed by a transparent pressing plate 32, the non-translucent portion 4 of the negative film 41 is formed.
At the portion 1b, the ultraviolet rays are blocked, while at portions other than the non-translucent portion 41b, the ultraviolet rays irradiate the ultraviolet-curable resin layer of the ultraviolet-curable film, and the resin is cured at that portion. Thereafter, when the ultraviolet-curable film is taken out of the tray 3 and washed with a solvent or water, the uncured ultraviolet-curable resin layer is dissolved or washed away and removed. On the other hand, an inverted positive image is obtained.

As the original sheet, a thermal PET film can be used. This thermal PET film is made of transparent PET (polyethylene terephthalate)
A heat-sensitive layer formed on the surface (one side) of the protective sheet made of resin;
When the thermal PET film is laminated with the thermal PET film and heated by a flash valve, the thermal PET film is not melted.

The heat-sensitive layer has the same components as the color-forming agent applied to the surface of a known normal heat-sensitive paper (for example, a colorant in which a colorless dye and a phenol compound are finely dispersed in a binder). Therefore, detailed description is omitted.
In manufacturing the original sheet in this case, when a frame 35 of the base 31 of the tray 3 is coated with a seat 35, a thermal PET film, and a heating sheet (a film coated with ink, black toner, or the like, and is irradiated with infrared rays). It has the property of generating heat), is laminated in the order of a negative film 41, is covered with a pressing plate 32 from above, and is engaged with the engaging body 33 so that it cannot be opened. Then, when the flash valve 14 flashes, the infrared light in the flash causes the non-translucent portion 41b of the negative film 412 to emit light.
Only the portion of the heating sheet corresponding to (facing) the other portion (light-transmitting portion) is heated, and a positive image in which the heating layer portion of the thermal PET film facing the heated portion is colored black or the like is formed. The formed manuscript sheet can be manufactured.

In addition, as the original sheet 11, P
Light non-transparent ink, oily marker, paint of any color such as black, white, gold, silver, etc. on the surface of a light transmissive sheet base material such as PC paper (manuscript paper for tracing) or transparent PET film Alternatively, a light-impermeable image portion may be drawn with paint or the like. Although a black-and-white photographic film is used as the negative film 41, a color photographic film can also be used.

[0049]

As described above, the plate-making substrate according to the first aspect of the present invention is a plate-making substrate for a porous stamp having open cells, wherein one side of the nonwoven fabric is coated with a urethane resin or the like. A porous sheet made of a soft synthetic resin material is formed, and a thin protective sheet having a light-transmitting property is temporarily attached to the upper surface of the porous sheet.

According to this structure, when the finished plate-making substrate is wound in a coil shape, the uneven surface of the nonwoven fabric as a support plate is engraved on the surface of the porous sheet previously covered with the protective sheet, There is no inconvenience such as the adhesion of fibers or other dusts, and the effect that the subsequent plate-making operation can be reliably executed. The invention according to claim 2 is the plate-making substrate according to claim 1, wherein a double-sided adhesive tape is stuck on one side of the nonwoven fabric opposite to the sticking surface of the porous sheet. Things.

According to this configuration, when stamp printing is performed after plate making, when the plate made by plate making is fixed to the stamp base, it is extremely easy to fix the plate with the double-sided adhesive tape.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a plate making apparatus.

FIG. 2 is a perspective view of a tray.

FIG. 3 is an enlarged side sectional view of a tray.

FIG. 4 is a cross-sectional view showing a state where the tray is inserted to a predetermined position.

FIG. 5 is a plan view of the plate making apparatus.

FIG. 6 is a perspective view showing a state in which a plate-making substrate and a document sheet are stacked on a tray.

FIG. 7 is a diagram illustrating an example of a manufacturing process of a plate making substrate.

8A is a cross-sectional view showing a state in which an original sheet, a protective sheet, and a plate-making substrate supported by a nonwoven fabric support plate are superposed, and FIG. 8B is a sectional view showing a state in which the protective sheet is removed from the plate-making substrate after plate-making. It is sectional drawing of the state separated.

9A is a cross-sectional view of a plate-making substrate provided with a double-sided adhesive tape, and FIG. 9B is a cross-sectional view of the plate-making substrate in a finished state of plate-making.

10A is a cross-sectional view illustrating a state of stacking members when manufacturing an original sheet, FIG. 10B is a cross-sectional view illustrating an ultraviolet irradiation state, and FIG. 10C is a cross-sectional view of a finished original sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 3 Tray 1b Side opening 10 Plate-making board 12 Mantle 12a Notch 13 Socket 14 Flash valve 15 Bezel 18 Switch 19 Switch case 19a Switch hole 20 Lock bolt 21 Lock hole 23 Support plate (nonwoven fabric) 24) Porous sheet 25 Protective sheet 31 Base 32 Pressing plate 32a Projection 33 Engagement body 33a Engagement part

Claims (2)

[Claims] 1. A plate-making substrate for a porous stamp having open cells, wherein a porous sheet made of a soft synthetic resin material such as urethane resin is formed on one surface of a nonwoven fabric, and the upper surface of the porous sheet is formed. Wherein a thin protective sheet having translucency is temporarily attached to the substrate. 2. The plate-making substrate according to claim 1, wherein a double-sided adhesive tape is attached to one surface of the nonwoven fabric opposite to the surface on which the porous sheet is formed.