JPH0747779A - Stencil printing original plate - Google Patents

Abstract

PURPOSE:To provide a stencil printing original plate in which no oozing of ink from a printed surface occurs at the time of making a printing plate, hands are not contaminated at the time of printing, and the ink is not changed in properties even if an unused original plate is preserved for a long period. CONSTITUTION:A stencil printing original plate 15 comprises a thermal stencil base sheet 1, an impregnating element 2, a shielding film 4, a frame 6 so disposed as to surround the element 2, an ink impermeable backup film 9 adhered to the frame 6, and ink 7 filled between the film 4 and the film 9. When the plate 15 is mounted at a stamping member after a printing plate is made, the film 9 is pressed, the ink 7 is passed through the film 4, impregnated to the element 2, oozed from a porous part of the sheet 2 to be transferred to a printing sheet.

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.

As a stencil printing apparatus using the heat-sensitive stencil sheet, a single cylinder type stencil printing apparatus 60 as shown in FIG. 7 is known. In the single cylinder type stencil printing device 60, the perforated heat sensitive stencil sheet 62 is wound around the outer peripheral surface of the cylindrical plate cylinder 61 so that the porous support side is the inner side, and the ink is applied to the cylindrical plate cylinder 61. Is supplied from the inside toward the outer peripheral surface of the cylindrical plate cylinder 61, and the press roller 64 is brought into pressure contact with the cylindrical plate cylinder 61 via the printing paper 63, and the cylindrical plate cylinder 61 is moved to the arrow B.
It is a device that prints by rotating in the direction of.

As another stencil printing apparatus, a pressing stencil printing apparatus 80 as shown in FIG. 8 is known. This is a heat-sensitive stencil sheet 71 obtained by bonding a thermoplastic film and a porous support to each other. A frame 72 is provided around the porous support, and the frame 72 and the ink impermeable cover sheet 73 are provided.
A heat-sensitive stencil sheet 70 having a concave portion 83 as an ink application portion is formed by using.

The pressing type stencil printing apparatus 80 has a pressing member 85, a receiving base 81 arranged to face the pressing member 85, and a heat-sensitive material arranged in the peripheral portion of the pressing member 85 facing the receiving base 81. It is composed of a holding member 82 for the stencil sheet 70. Ink is applied to the concave portion 83 formed by the frame body 72 of the perforated heat-sensitive stencil plate 70, the cover sheet 73 is covered, and the holding member 82 holds the pressing member 85. Pedestal 8 via printing paper 84
It is a device for printing by moving and pressing to 1.

However, the single cylinder type stencil printing machine 6
With 0, the device becomes large and it is for mass printing, so
A relatively small amount of printing results in high running costs.

On the other hand, the press type stencil printer 80 can be miniaturized, but since the user has to apply ink, the hands and clothes are soiled when applying ink, and the ink thickness is reduced. Since it is not uniform, there is a drawback that uneven printing occurs.

FIG. 9 shows a stencil printing plate disclosed in Japanese Patent Laid-Open No. 4-166390 proposed in order to improve the above-mentioned drawbacks. This stencil printing plate 90 is arranged on the side of the porous support 92 of the heat-sensitive stencil sheet 95 and a heat-sensitive stencil sheet 95 in which a thermoplastic film 91 and a porous substrate 92 are adhered, and is impregnated with ink. Nonwoven 93
And a film 94 which is an ink impermeable base material are sequentially laminated. On the stencil printing plate 90, a perforated image is formed by selectively heating and melting the surface of the thermoplastic film 91 of the heat-sensitive stencil sheet 95 with a plate making apparatus using a thermal head. Hereinafter, the formation of the punched image is referred to as plate making.

Next, the stencil printing plate 90 thus prepared is
The stencil printing is performed by being attached to a pressing member having a grip (hereinafter referred to as a stamp member) and pressing the stamp member against the printing paper.

However, in the stencil printing plate 90 described above,
When the plate is made by the thermal head, the ink oozes out from the perforated portion in a small amount, so that the ink adheres to the thermal head and the ink is formed on the surface of the thermoplastic film 91 (hereinafter referred to as the stamp surface) of the stencil printing plate 90. There was a problem of sticking.

Therefore, between the heat-sensitive stencil sheet prepared by adhering the thermoplastic film and the porous support to the impregnated body containing the ink, which is arranged on the porous support side of the heat-sensitive stencil sheet. The one provided with a detachable separator has been proposed. According to this, since there is this separator at the time of plate making, there is no bleeding of ink at the time of plate making by the thermal head, and at the time of printing, the separator may be pulled out and used.

[0012]

However, in the stencil printing plate described above, the ink is attached to the surface of the stencil printing plate which is in contact with the separator and the impregnated body impregnated with the ink, and the separator is used before printing. There is a problem that the hands get dirty when removing the tape. Further, a slit is required to pull out the separator, and there is a problem that the ink comes into contact with air and deteriorates when the unused master plate for stencil printing is stored for a long period of time.

The present invention has been made to solve the above-mentioned problems, and provides a stencil printing plate which does not stain the hands and does not deteriorate the ink even if an unused stencil printing plate is stored for a long period of time. The purpose is to do.

[0014]

In order to achieve this object, in the stencil printing plate of the present invention, a heat-sensitive stencil sheet comprising a thermoplastic film and a porous support bonded to each other, and the heat-sensitive stencil sheet. While supporting the porous support side of
A stencil printing plate comprising a frame body having an opening for holding ink in the opening and an ink impermeable base material, which are sequentially laminated, and a shielding film between the heat-sensitive stencil sheet and the ink. And the ink impermeable substrate is formed of a deformable member.

[0015]

In the stencil printing plate of the present invention having the above-mentioned structure, the stencil printing plate is made by a plate making apparatus using a thermal head. Next, the plate-making master plate for stencil printing is attached to the stamp member. Then, by pressing the stamp member by hand, the base material of the stencil printing plate is deformed. As a result, the ink passes through the shielding film of the stencil printing plate, the ink oozes out from the perforated portion of the heat-sensitive stencil sheet, and stencil printing is performed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the stencil printing plate of this embodiment is roughly divided into a heat-sensitive stencil sheet 1, an impregnation body 2, a shielding film 4, an ink 7, and an impregnation body 2.
And a frame body 6 arranged so as to surround the ink 7, and a backup film 9 which is an ink impermeable base material.

As shown in FIG. 4, the heat-sensitive stencil sheet 1 comprises a thermoplastic film 31, an adhesive layer 32, and a porous support 33. In this embodiment, the thermoplastic film 31 is a polyethylene terephthalate film (hereinafter abbreviated as PET film) having a thickness of 2 μm, but other examples include polypropylene and vinylidene chloride.
Examples thereof include films of vinyl chloride copolymer and the like. PET
The thickness of the film is preferably 1 μm to 4 μm.
PET film with a thickness of less than 1 μm is expensive to manufacture,
Moreover, its strength is weak and not practical. On the other hand, in a general thermal head, since only energy of about 50 mJ / mm ² can be applied, it is not possible to perforate even with a thickness of 4 μm or more.

The porous support 33 is made of, for example, natural fibers such as Manila hemp, groove, mitsumata, synthetic fibers such as polyethylene terephthalate, polyvinyl alcohol and polyacrylonitrile, and semi-synthetic fibers such as rayon. Porous thin paper used as the main raw material is used.

As shown in FIG. 1, the heat-sensitive stencil sheet 1 having the above construction is adhered to a frame body 6 by an adhesive layer 3 to form a frame body 6.
After the impregnated body 2 is inserted in, the shielding film 4 is adhered to the frame body 6 by the adhesive layer 5. Further, after the frame body 6 is filled with the ink 7, the backup film 9 is adhered to the frame body 6 by the adhesive layer 8.

As the shielding film 4, a porous film having a high water pressure resistance, through which the ink 7 passes when a high pressure is applied, is used. In the present embodiment, the fluorine fiber sheet manufactured by Tomagawa Paper Mill is used.
Tore R250 was used, but other films such as Goretex membrane manufactured by Japan Gore-Tex, Microtex manufactured by Nitto Denko, and Entrant manufactured by Toray are listed.

In this embodiment, since the ink 7 filled in the frame 6 is oily, the material of the frame 6 is vinyl chloride, polypropylene, polyethylene, polyacetal, polyethylene terephthalate or the like which is not corroded by the oily ink. .

The impregnating member 2 is made of a material which allows ink to bleed out when pressure is applied. In this embodiment, the impregnated body 2 is made of an elastic foam such as polyurethane or acrylonitrile butadiene rubber, or polypropylene, polyethylene, polyethylene terephthalate, or a lathe.
A non-woven fabric made of Yong is used.

The thickness of the impregnated body 2 is 2 times the thickness of the frame body 6.
It is preferable to set the ratio to one-third or more and three times or less. Within this range, the elastic foamed body 7 is compressed by the pressing force of the thermal head during plate making, and has the same thickness as the frame body 6.

If the thickness of the impregnated body 2 is too small, the ink 7 is excessively ejected at the initial stage of imprinting, resulting in bleeding printing, and in the latter stage of imprinting, the ink 7 is poorly ejected and faint printing is performed. On the contrary, if the thickness is too large, the thickness of the frame body 6 does not become less than the thickness of the frame body 6 even if the impregnated body 2 is compressed by the pressing force of the thermal head during plate making. For this reason, when the stencil printing master plate 15 is transported during plate making, it becomes difficult to press a transporting means such as a roller against only the frame body 6, so that the thickness of the impregnated body 2 varies, and thus the stencil printing master plate 15 is difficult. Problems such as unevenness in the conveyance feed pitch of No. 15 and skewed conveyance may occur.

An ink having a high yield value, such as W /
When an O emulsion ink or the like is used, it is possible to manufacture the stencil printing plate 15 without using the impregnation body 2. Further, when the impregnation body 2 is not used, it is also possible to use a hard polystyrene film or an acrylic sheet having a groove so as to be damaged when pressure is applied to the shielding film 4.

The backup film 9 is made of a member that is impermeable to ink and is deformable. Further, as the backup film 9, acrylonitrile-butadiene rubber, fluororubber, epichlorohydrin rubber, butyl rubber, acrylic rubber, urethane rubber, chloroprene rubber or the like can be used as a material that is not attacked by oil-based ink. Rubber is used. Further, the backup film 9
As the stencil printing original plate 16 shown in FIG. 3, a film made of vinyl chloride, polypropylene, polyethylene, polyacetal, polyethylene terephthalate or the like in which the central portion of the backup film 11 has a convex shape can also be used.

Next, the stencil printing plate 15 described above is made into a plate by the plate making apparatus 30 shown in FIG.

The plate making device 30 moves the thermal head 21 along the guide roller 22 in the direction of arrow A so that the surface of the thermoplastic film 31 of the heat-sensitive stencil sheet 1 is mirror-image printed according to the printing information. Punching is performed by selectively heating and heating and melting a predetermined portion of the thermoplastic film 31.

At the time of plate making, the thermal head 21 is brought into contact with the stencil printing base plates 15 and 16 by a predetermined pressing force. At this time, the shielding film 4 is provided between the heat-sensitive stencil base paper 1 and the ink 7. Is arranged, even if the thermoplastic film 31 of the heat-sensitive stencil sheet 1 is perforated, the ink does not ooze out from the perforated portion.

The stencil printing plate 15 thus prepared is mounted on the stamp member 40 as shown in FIG. The stamp member 40 includes a handle portion 41, a cushion layer 42, an adhesive layer 43, and a pressing member 44.

The size of the pressing member 44 is smaller than the opening for holding the ink 7 provided in the frame 6 of the stencil printing plate 15. The pressing member 44 is made of plastic,
It is made of a rigid material such as metal or wood.

The stencil printing plate 15 is a stencil printing plate 1.
The backup film 9 (11) side of 5 is attached by being pressed so as to adhere to the adhesive layer 43 of the stamp member 40. At this time, the backup film 9 (11) is deformed toward the ink 7 by the pressing member 44. As a result, a pressure higher than the water pressure resistance of the shielding film 4 is applied to the ink 7, and the ink 7 passes through the shielding film 4. When the polystyrene film or acrylic sheet is used as the shielding film 4, the groove provided in the shielding film 4 is damaged and the ink 7 passes through.

The ink 7 that has passed through the shielding film 4 is impregnated with the ink 2.
The stamp member 40 in this state.
When pressed against 5, the impregnated body 2 is compressed, and the permeated ink 7 oozes out from the perforated portion of the thermoplastic film 31, and the ink 7 can be transferred to the printing paper 45.

[0034]

As is clear from the above description, the stencil printing plate of the present invention has a shielding film between the heat-sensitive stencil sheet and the impregnated body impregnated with the ink. No ink bleeds from the print surface. In addition, since the ink comes out through the shielding film without touching it by hand at the time of printing, it is possible to print without making the hand dirty. In addition, since the unused stencil printing plate does not come into contact with ink and air,
It has excellent effects such as no ink deterioration.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a stencil printing plate of the present invention.

FIG. 2 is a perspective view of an original plate for stencil printing of the present invention.

FIG. 3 is a sectional view showing another embodiment of the stencil printing plate.

FIG. 4 is a sectional view of a heat-sensitive stencil sheet.

FIG. 5 is a schematic configuration diagram of a plate making device.

FIG. 6 is a diagram illustrating a state where a stencil printing plate is mounted on a stamp member.

FIG. 7 is a schematic configuration diagram of a conventional single-cylinder type stencil printing apparatus.

FIG. 8 is a cross-sectional view of a conventional pressing stencil printer.

FIG. 9 is a cross-sectional view of a conventional stencil printing plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat-sensitive stencil base paper 2 Impregnation body 4 Shielding film 6 Frame body 7 Ink 9 Backup film 11 Backup film 15 Stencil printing plate 31 Thermoplastic film 33 Porous support

Claims (2)

[Claims] 1. A heat-sensitive stencil sheet in which a thermoplastic film and a porous support are bonded together, and a porous support side of the heat-sensitive stencil sheet is supported and an ink is retained in the opening. In a stencil printing original plate in which a frame and an ink impermeable substrate are sequentially laminated, a shielding film is provided between the heat-sensitive stencil sheet and ink, and the ink impermeable substrate is modified. An original plate for stencil printing, which is composed of a possible member. 2. The master plate for stencil printing according to claim 1, wherein when the ink impermeable base material is deformed, the shielding film is configured to allow ink to pass therethrough.