JP3195013B2 - Heat-sensitive stencil sheet, perforation method and printing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates are those heat-sensitive stencil sheet, about the drilling method and a printing method.

[0002]

2. Description of the Related Art Conventionally, one surface of a heat-sensitive stencil printing base paper in which a thermoplastic resin film is bonded to a porous support such as porous thin paper with an adhesive or an adhesive, or a porous support such as porous thin paper. There is known a heat-sensitive stencil sheet having a coating layer mainly composed of a thermoplastic polymer.

When making a plate using the heat-sensitive stencil sheet, the original and the film surface or the polymer layer surface of the heat-sensitive stencil sheet are brought into close contact with each other, and the heat-sensitive stencil sheet is pressed from the porous support side. Irradiate infrared or xenon flash light to generate heat in the black image portion of the original, and the heat melts and perforates the film or polymer layer of the heat-sensitive stencil sheet, and then the original and the heat-sensitive stencil sheet Peel off the base paper. Alternatively, the image of the original is read by an image sensor, and the film or polymer layer of the heat-sensitive stencil sheet is melt-punched according to the image by the heat of the thermal head. The heat-sensitive stencil sheet made in this manner is wound around an ink drum and printed by supplying ink from the porous thin paper side.

[0004]

When printing is performed using such a heat-sensitive stencil sheet, it is possible to obtain a sufficient print quality in a printed matter for character information.
However, in recent years, there has been an increasing demand for sufficient print quality (high image quality and high resolution) even for printed materials intended for image information containing a large amount of solid portions from such character information. Studies have been made to reduce the size of the hole formed in the resin film.

[0005] That is, while the applied energy of the thermal head is conventionally from about 0.10 mj / dot to higher, the applied energy is reduced or the size of the heating element itself of the thermal head is reduced. It is being considered. However, in order to reduce the size of the heating element, it is necessary to lower the applied energy in view of the pulse resistance (lifetime) of the heating element. In other words, in order to achieve high image quality and high resolution, the energy applied to the heating element of the thermal head must be reduced. Therefore, a thermoplastic resin film that can be perforated with lower energy than before is used. In this case, the role of the porous thin paper (porous support) in image quality becomes larger than before. SUMMARY OF THE INVENTION It is an object of the present invention to provide a heat-sensitive stencil sheet for perforating a heat-sensitive stencil sheet capable of achieving high image quality when the energy applied to the thermal head is low, and a printing method thereof .

[0006]

Means for Solving the Problems In view of the above situation, the present inventors have been studying this porous thin paper, and have bonded a thermoplastic resin film to the wire surface and the filter surface of the porous thin paper. It was found that when the energy applied to the heating element of the thermal head was 0.09 mg / dot or less, there was a significant difference in image quality.

That is, according to the present invention, firstly,
Attaching the wire side of functional thin paper and thermoplastic resin film
The combined heat-sensitive stencil sheet is applied
Using a thermal head of 0.09 mj / dot or less
A heat-sensitive stencil sheet characterized by being perforated
Second, the wire surface of the porous tissue paper and the thermoplastic
Heat-sensitive stencil sheet made by laminating resin film
With a therma having an applied energy of 0.09 mj / dot or less
Sensitivity characterized by drilling with a melt head
A method of perforating a stencil sheet is provided. This second departure
Clearly, the heat-sensitive stencil sheet is made of porous thin-leaf paper.
Surface and the thermoplastic resin film with an adhesive
The method includes the method of piercing the heat-sensitive stencil
Rarely, the basis weight of the porous thin paper are, are 5 to 15 g / m ²
Perforation methods are included. Also, according to the present invention, thirdly,
Supplying ink to the first heat-sensitive stencil sheet for printing
A printing method is provided.

The lamination of the heat-sensitive stencil sheet of the present invention is preferably performed by bonding a thermoplastic resin film to a wire surface of a porous thin paper with an adhesive, and the porous thin paper has a basis weight of 5 to 15 g. / M ² , a more favorable effect is obtained.

In the present invention, the wire surface is the wire side of a paper machine. The image quality is the reproducibility of a thin line image (about 7 points). When the image is bonded to a felt surface, the line is cut off, so-called line breakage occurs and the image is blurred, resulting in a terrible image. If it does, it will interfere with interpretation.

The porous thin paper used in the present invention needs to be porous so that the printing ink used at the time of printing can pass therethrough. For example, various kinds of paper, particularly coarse paper such as Japanese paper, are required. And synthetic paper and mesh sheets made of chemical fibers such as rayon, vinylon, polyester, acrylonitrile, polyamide, etc., mixed paper with chemical fibers and natural fibers such as manila hemp, mulberry, mitsumata, etc.
Any of those used as a porous support for conventional heat-sensitive stencil printing base paper can be used in the present invention.

The weight of the porous thin paper is preferably 5 to 15 g / m ² as described above. That is, when the weighing is smaller than 5 g / m ² , the strength of the heat-sensitive stencil printing base paper is insufficient, and wrinkles are generated during conveyance or wrinkles are likely to occur when printing in large quantities. Conversely, weighing 1
If it is larger than 5 g / m ² , the strength is increased, but a large number of sheets are required until the entire image becomes clear at the start of printing, and so-called waste paper increases, which is disadvantageous in cost .

[0012] Further, thermoplastic resin films which have been conventionally used, for example, polyvinyl chloride films, vinyl chloride-vinylidene chloride copolymer films, polyester films, polyolefin films such as polyethylene and polypropylene, and polystyrene films are exemplified. Any of these can be used, and the thickness of these thermoplastic resin film layers is desirably about 1 to 6 μm so that perforations can be easily formed by a heating means such as a thermal head.

Further, the adhesive used may be the same as the adhesive used in the conventionally known heat-sensitive stencil printing paper.
Polyester resin with a molecular weight of about 1,000 to tens of thousands, polyvinyl acetate resin, ethylene-vinyl acetate copolymer resin, chlorinated polypropylene, polyacrylate,
Terbene resin, Coumarone resin, Indene resin, SBR,
It is mainly composed of a thermoplastic resin such as ABS, polyvinyl ether and polyurethane resin.

In addition to the above components, wax-based polymers and oligomers having a relatively low melting point, such as polyethylene glycol, polypropylene glycol, paraffin, and aliphatic polyester, for improving the heat melting property of the formed adhesive. , Paraplex, polyethylene sepate, polyethylene adipate and the like are preferably added, and these waxes can be used in place of the above-mentioned thermoplastic resin. When the adhesive is cured with an actinic ray such as an electron beam or an ultraviolet ray, an acrylic monomer or an oligomer is added to the resin.

Further, an anti-fusing agent may be applied to the surface of the thermoplastic resin film, if necessary, and silicone oils, silicone rubbers, silicone resins, fluorine compounds and the like generally used as the anti-fusing agent, or A surfactant such as a phosphate ester type can be used.

Next, the present invention will be described more specifically with reference to examples and comparative examples. Example 1 A biaxially stretched polyester film having a thickness of 2 μm was used as a thermoplastic resin film, and a basis weight of 11 g /
using Manila hemp tissue paper m ² bonded to a thermoplastic resin film on the wire surface polyvinyl acetate coating amount of solids 1 g / m ^2, the silicone oil to the film surface 0.05 g /
m ² was applied, and the anti-sticking layer to obtain a heat-sensitive stencil sheet.

Example 2 As a porous thin paper, vinylon 30 weighing 10 g / m ² was used.
% And 70% of Manila hemp were used in the same manner as in Example 1 to obtain a heat-sensitive stencil sheet.

Comparative Example 1 A heat-sensitive stencil sheet was obtained in the same manner as in Example 1 except that a thermoplastic resin film was attached to the opposite side of the wire surface (felt surface) of the porous thin paper.

Comparative Example 2 A heat-sensitive stencil sheet was obtained in the same manner as in Example 2 except that a thermoplastic resin film was attached to the opposite side of the wire surface (felt surface) of the porous thin paper.

Table 1 shows the results of a printing test performed on the heat-sensitive stencil sheets prepared in the above Examples and Comparative Examples.

Test method: 50 preprinted heat-sensitive stencil sheets for stencil printing were printed with Ricoh Preport SS950, and 10 to 50
The judgment was made visually on fine characters of the printed matter.

Criteria ○: Fine characters are not broken or broken, and there is no practical problem. ×: Fine characters are crushed. Δ: Line break occurs in fine characters. × to ：: Fine characters are slightly broken. Δ to ：: Slight line breaks occur in fine characters.・ "Brush" refers to a state in which a line between characters is connected. -"Line break" means a state in which a line between characters is not connected.

[0023]

[Table 1]

[0024]

As apparent from Table 1, according to the present invention, the energy applied to the heating element of the thermal head can be reduced.
At 0.09 mj / dot or less, reproducibility of a fine line image can be obtained without any problem.

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hideyuki Yamaguchi 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (56) References JP-A-1-2697094 (JP, A) JP-A Sho 58-176641 (JP, A) JP-A-3-185194 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41N 1/24 102 B41C 1/14 101

Claims (5)

(57) [Claims] 1. A heat-sensitive stencil sheet obtained by laminating a wire surface of a porous thin paper and a thermoplastic resin film.
With a therma having an applied energy of 0.09 mj / dot or less
Heat- sensitive stencil printing paper characterized by being melt-punched using a stencil head. 2. A heat-sensitive stencil printing paper obtained by laminating a wire surface of a porous thin paper and a thermoplastic resin film is applied to a thermistor having an applied energy of 0.09 mj / dot or less.
A method for perforating a heat-sensitive stencil printing base paper, wherein the perforation is performed using a melt head . 3. The heat-sensitive stencil printing base paper is a porous thin leaf.
Adhesive between the wire surface and the thermoplastic resin film
3. The thermosensitive stencil according to claim 2, wherein the stencil is adhered to the stencil.
Perforation method for base paper for printing. 4. The porous thin paper having a basis weight of 5 to 15 g /
heat-sensitive stencil perforation method printing sheet according to claim 2 or 3 is m ^2. 5. The heat-sensitive stencil sheet according to claim 1.
Printing method characterized by supplying ink to the printing
Law.