JPH06286355A - Original plate for stencil printing - Google Patents

Abstract

PURPOSE:To provide an original plate for stencil printing which has a simple structure and can be handled easily without staining a thermal head and a printing face with ink. CONSTITUTION:An original plate for stencil printing 10 comprises a thermosensible stencil base paper 12, a filter 14 made of a material having low wettability, an ink-impregnated body 16, a frame body 18 opening so as to surround the ink-impregnated body 16, and a support sheet 20 as a base material having ink impermeability.

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 for stencil printing.

[0002]

2. Description of the Related Art Conventionally, a heat-sensitive stencil sheet that can be perforated by infrared irradiation or a thermal head has been known. A typical example thereof is one in which a thermoplastic film and porous thin paper are laminated with an adhesive. A stencil printing plate using such a heat-sensitive stencil sheet is disclosed in Japanese Patent Application No. 4-65.
No. 05 application is proposed in the specification and drawings attached.

In this specification and the drawings, forming a perforated image by heating and melting the thermoplastic film surface (print surface) of the heat-sensitive stencil sheet with a plate making apparatus using a thermal head is referred to as plate making. In this stencil printing plate, a removable separator is arranged between the heat-sensitive stencil sheet and the ink impregnated body. This separator was effective in preventing the ink impregnated in the impregnated body from adhering to the thermal head during plate making by the plate making apparatus.

[0004]

However, the structure of the stencil printing master plate is complicated by having the separator, or the separator and the stencil base paper are slipped at the time of plate making (perforation) by the plate making device, and the perforation position is displaced, or is removed. Moreover, there is a problem that the separator has a high risk of soiling the user's hands.

In the case where a plate is not provided with a separator, a small amount of ink bleeds from the perforated portion during plate making by the thermal head, so that the ink adheres to the thermal head and also on the thermoplastic film surface (print surface) of the stencil printing plate. However, there was a problem that ink adhered.

The present invention has been made in order to solve the above-mentioned problems, and provides a stencil printing original plate which has a simple structure and is easy to handle without the thermal head and the stamp surface being contaminated by ink. With the goal.

[0007]

To achieve this object, a stencil plate of the present invention comprises a heat-sensitive stencil sheet on which a thermoplastic film and a porous support are adhered, an ink impregnated body, A stencil printing plate having an opening while supporting the heat-sensitive stencil sheet, and a frame holding the ink impregnated body in the opening, and an ink impermeable substrate, The heat-sensitive stencil sheet has a structure in which a filter made of a material having low wettability is mounted between the porous support side and the ink impregnated body.

[0008]

The stencil printing plate of the present invention having the above-mentioned structure is plate-formed (perforated) by heating and melting the thermoplastic film surface (printing surface) of the heat-sensitive stencil sheet with a plate-making device using a thermal head or the like. . At this time, by mounting a filter formed of a material having low wettability between the porous support side of the heat-sensitive stencil sheet and the ink impregnated body, the material is provided in the normal storage stage. The low wettability of the ink prevents the ink from penetrating between the fibers of the filter.

As a result, the ink does not reach the porous support of the heat-sensitive stencil sheet from the ink-impregnated body even when left standing. That is, there is no ink other than the ink impregnated body, and the filter and the heat-sensitive stencil sheet formed of the above-mentioned material having low wettability continue to be in the mounted state (dry state). Therefore, when the plate is made by the thermal head, there is no ink in the heat-sensitive stencil sheet and the filter formed of the material having low wettability, and therefore the ink does not exude from the perforated portion only by the pressing pressure of the thermal head. There is no problem that ink adheres to the thermal head or ink adheres to the thermoplastic film surface (print surface) of the stencil printing plate.

When printing is carried out using the stencil printing plate thus produced, the ink escape path is eliminated because a uniform pressure is applied to the entire printing surface, and as a result, a filter formed of the above-mentioned material having low wettability is used. The ink reaches the heat-sensitive stencil sheet after passing through the sheet and printing becomes possible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

First, the ink (W / O type emulsion ink) used for the stencil printing plate of this embodiment was formed by a known method with the following composition.

Ink composition Weight part Carbon black 4 Dark blue 1 Phenolic resin 10 Spindle oil 20 Fatty acid glycerin ester 5 Water 60 Next, FIG. 1 is a sectional view of the stencil printing plate 10 of this embodiment, and FIG. The figure is shown. Master plate 10 for stencil printing
Are roughly divided into a heat-sensitive stencil sheet 12, a filter 14 formed of a material having low wettability, and an ink impregnated body 1.
6, a frame 18 having an opening so as to surround the ink impregnated body 16, and a support sheet 20 which is an ink impermeable base material.

As shown in FIG. 3, the heat-sensitive stencil sheet 12 is composed of a thermoplastic film 22, an adhesive layer 24, and a porous support 26. In this embodiment, the thermoplastic film 22 is a polyethylene terephthalate film (PET film) having a thickness of 2 μm, but other films such as polypropylene and vinylidene chloride-vinyl chloride copolymer may be used. The thickness of the PET film is preferably 1 μm to 4 μm. P less than 1 μm
ET films are not practical because they are expensive to manufacture and weak in strength. On the other hand, with a general thermal head, 50 mJ
Since only energy of about / mm ² can be applied, 4
If it is more than μm, it cannot be perforated.

The porous support 26 is mainly composed of natural fibers such as Manila hemp, Kozo and Mitsumata, synthetic fibers such as polyethylene terephthalate, polyvinyl alcohol and polyacrylonitrile, and semi-synthetic fibers such as rayon. Thin paper is used. In this example, polyethylene terephthalate porous thin paper was used.

As shown in FIG. 2, the heat-sensitive stencil sheet 12 having the above-mentioned structure is bonded to the frame body 18 at four sides by the adhesive layer 28. Further, the frame body 18 is provided with an opening portion 17 at the center thereof in accordance with the size of the ink impregnated body 16. Frame 18
An adhesive layer 28 for adhering the heat-sensitive stencil sheet 12 was formed on the upper side of the sheet on four sides (hatched portion in the figure).

On the other hand, as the filter formed of a material having low wettability in this embodiment, a filter made of a silicone resin, a polyolefin resin, a fluororesin and a woven cloth, a non-woven cloth or a foam coated with these resins should be used. Is desirable. This time, a fluororesin non-woven fabric (Fluorofiber filter R-250 manufactured by Tomoegawa Paper Co., Ltd.) was used. The thickness of the filter formed of the material having low wettability is preferably 50 to 400 μm. If it is 50 μm or less, the pressure of the thermal head may cause the ink to pass through the filter, causing the ink to ooze out from the perforations, and the thermal head may be contaminated with the ink. If it is 400 μm or more, the ink cannot easily pass through the filter even if pressure is applied to the entire plate surface during printing, and it is necessary to apply pressure many times in order to obtain a good printed image. Of.

Further, in this embodiment, since the organic solvent is used for the ink, polypropylene is used as the material of the frame 18. Other than these, it is also possible to use vinyl chloride, polypropylene, polyethylene, polyacetal, polyethylene terephthalate, etc., which are not affected by the oil-based ink.

When the ink impregnated body 16 was saturated with the ink and pressure was applied to the ink impregnated body 16, the impregnated ink exuded. In this example, a polypropylene non-woven fabric was used as the ink impregnation body. In addition to this, it is possible to use a non-woven fabric using a synthetic fiber such as polyethylene or polyethylene terephthalate, or a porous body such as polyethylene, polyurethane, polyvinyl chloride or NBR latex.

The thickness of the ink impregnated body 16 is preferably set to ½ or more and 3 times or less the thickness of the frame body 18.
Within this range, the ink impregnated body 16 is compressed by the pressing force of the thermal head during plate making to have the same thickness as the frame body 18. However, if the thickness is too small, the heat-sensitive stencil sheet 12 enters the inside of the frame 18 at the time of plate making, and the heat-sensitive stencil sheet 12 does not come into contact with the thermal head. Also,
On the contrary, if the thickness is too large, even if the ink impregnated body 16 is compressed by the pressing force of the thermal head, the thickness does not become less than the thickness of the frame body 18. For this reason, it becomes impossible to convey the stencil printing plate 10 using the frame 18 during plate making, and variations in the thickness of the ink impregnated body 16 cause unevenness in the feeding feed pitch of the stencil printing plate 10 or skewing. Then, problems such as being transported are generated.

An adhesive layer 28 is formed on the upper surface (hatched portion in FIG. 2) of the support sheet 20, and the frame 18 and the ink impregnated body 16 are bonded to each other. In this example, an NBR sheet having rubber-like elasticity and impermeable to ink was used as the support sheet. When the support sheet 20 is bonded to the frame 18 and the ink impregnated body 16, the support sheet 20
Then, a weak tension of about several kgf was applied, and the dimension was extended by about 10%. As a result, the oil-based ink held inside the frame 18 could be applied with a pressure slightly higher than the atmospheric pressure.

Next, the operation will be described. The stencil printing plate 10 described above was made into a plate using a plate making apparatus described below.
In this plate making apparatus, the surface of the thermoplastic film 22 of the heat-sensitive stencil sheet 12 is selectively heated by a thermal head 50 so that mirror image printing is performed according to print information, and a predetermined portion of the thermoplastic film 22 is heated and melted. It has a structure for perforating.

First, as shown in FIG. 4, the thermal head 50 of the plate making apparatus is brought into contact with the stencil printing plate 10 by a predetermined pressing force, and then the thermal head 50 is used to print the heat-sensitive stencil sheet 12. A plate was made (perforated) by heating and melting the 22nd surface (printed surface) of the thermoplastic film.
At this time, the printing surface and the thermal head 50 were not contaminated by the adhered ink.

On the other hand, a stencil printing plate was formed without using the filter 14 formed of a material having low wettability, and the plate was made by the same operation as described above. Has adhered.

The stencil printing plate 10 thus prepared was mounted on a stamp member 34 as shown in FIG. The stamp member 34 includes a handle portion 36 and a cushion layer 3
8 and the adhesive layer 40. More specifically,
The stencil printing plate 10 was mounted by adhering the support sheet 20 side of the stencil printing plate 10 to the adhesive layer 40 of the stamp member 34.

In this state, the stamp member 34 is attached to the printing paper 4
When pressed against 2, the non-woven fabric 16 is compressed, and the impregnated ink oozes out from the perforated portion of the printing surface and the printing paper 4
The ink was transferred to No. 2 and an image could be formed on the printing paper 42.

As is apparent from the above description, according to the stencil printing plate 10 of this embodiment, the conventional separator is not necessary, and the thermal head 50 and the printing surface can be formed by ink with a simple structure. It doesn't get dirty.

The present invention is not limited to the embodiments described in detail above, and modifications can be made without departing from the spirit of the invention.

[0029]

As is apparent from the above description,
According to the stencil printing plate of the present invention, the conventional separator is not required, and the thermal head and the printing surface are not contaminated by ink with a simple structure.

[Brief description of drawings]

FIG. 1 is a sectional view of a stencil printing plate.

FIG. 2 is an exploded perspective view of a stencil printing plate.

FIG. 3 is an enlarged sectional view of a heat-sensitive stencil sheet.

FIG. 4 is a perforated state diagram.

FIG. 5 is an explanatory view showing a state where a stencil printing plate is mounted on a stamp member.

[Explanation of symbols]

 10 Master plate for stencil printing 12 Heat-sensitive stencil base paper 14 Filter formed of a material having low wettability 16 Ink impregnated body 17 Opening 18 Frame 20 Support sheet 22 Thermoplastic film 24 Adhesive layer 26 Porous support

Claims (1)

[Claims] 1. A heat-sensitive stencil sheet on which a thermoplastic film and a porous support are bonded, an ink impregnated body, and an opening portion for supporting the heat-sensitive stencil sheet and having an opening in the opening portion. A frame for holding an ink impregnated body, and an ink impermeable substrate are laminated, and in the stencil printing plate having a configuration in which the heat-sensitive stencil sheet surface is heat-punched during plate making, the heat-sensitive stencil sheet and the A master plate for stencil printing, characterized in that a filter formed of a material having low wettability is mounted between the ink impregnated body and the ink impregnated body.