JPH09169100A - Manufacture of thermosensitive stencil original paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermosensitive stencil original paper wherein a cost of the whole of the thermosensitive original paper is lowered and start of thermosensitive stencil printing is quick by a method wherein an operation property of laminating a heat perforated film on a perforated substrate of inferior strength such as low basis weight tissue paper, home tissue paper, etc., is improved. SOLUTION: In a method for manufacture of thermosensitive stencil original paper by bonding a heat perforated film to a perforated substrate, the heat perforated film coated with an adhesive is conducted to a winding surface of a roll-like perforated substrate, and the heat perforated film is stuck to the perforated substrate by pressure welding them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a heat-sensitive stencil sheet, particularly a heat-sensitive stencil sheet prepared by a thermal head.

[0002]

2. Description of the Related Art A heat-sensitive stencil sheet is usually prepared by laminating an ink-permeable porous support and a heat-perforated film via an adhesive. The heat-sensitive stencil printing is a method in which desired characters, figures, etc. are heat-perforated on the film surface of the base paper to form a plate, and the plate is used for printing. As this plate making method, a digital plate making method using a thermal head and a method of irradiating infrared rays or xenon flash light are already known. Especially, heat sensitive stencil printing by digital plate making method with thermal head is cheaper than copying by electrostatic copying method when a large number of sheets are required, and high speed and short time processing can be performed. It has the advantage of being rapidly popularized in offices, schools, etc. In the case of producing a heat-sensitive stencil sheet, it is generally performed that a porous support and a heat-perforated film are bonded together with an adhesive, and a stick-preventing agent is added to the side that comes into contact with and passes through a thermal head. . In the case of industrially producing this heat-sensitive stencil sheet, an adhesive is applied to the heating perforated film as a gravure roll,
After applying with a wire bar etc., it is rolled up by the action of a roll,
On the other hand, the porous support is rolled up by a roll, and the heating perforated film is adhered to the porous support by closely contacting the roll by a roll, or the adhesive is first attached to the porous support by a gravure roll, a wire bar, etc., and then It is known that a heat-perforated film is adhered to a sheet with the aid of a roll or the like so that they are adhered to each other and then an anti-sticking agent is attached thereto (Japanese Patent Publication No. 3-6528).
0). Further, recently, a method has also been proposed in which a porous support coated with an adhesive and a roll-shaped heat-punched film are brought into pressure contact with each other on the winding surface (JP-A-7-61159).

[0003]

In recent years, there is an increasing demand for reducing the cost of the heat-sensitive stencil sheet by using an inexpensive material for the porous support of the heat-sensitive stencil sheet.
There is also a demand for a heat-sensitive stencil sheet in which the basis weight of the porous support is as low as possible in order to speed up even one sheet of heat-sensitive stencil printing. However, when such a low-basis weight porous support is laminated with a heat perforated film by a conventional method, there are problems that the porous support is ruptured during the laminating operation and wrinkles easily occur. In particular, when a low-cost household thin paper (tissue paper, toilet paper, etc.) or other porous support that is inferior in strength is used, breakage due to tensile force occurs during the operation to apply the adhesive to the surface. However, it is extremely difficult to produce a heat-sensitive stencil sheet. An object of the present invention is to reduce the cost of the whole heat-sensitive stencil sheet and improve the start-up of heat-sensitive stencil printing by improving the laminating workability of the porous support and the heat-perforated film which are inferior in strength such as low basis weight thin paper and household thin paper. It is to provide a quick heat sensitive stencil sheet.

[0004]

Means for Solving the Problems The present inventors have conducted intensive studies on the above problems and completed the present invention. That is,
According to the present invention, in the method for producing a heat-sensitive stencil sheet by adhering the heat-perforated film and the porous support, the heat-perforated film coated with an adhesive is introduced to the winding surface of the roll-shaped porous support, Provided is a method for producing a heat-sensitive stencil sheet, which comprises bonding a heat-perforated film and a porous support together by bringing them into pressure contact with the porous support.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The material of the porous support of the present invention is
Any material can be used as long as it does not substantially perforate during heating and allows ink to pass through during printing. The porous support is specifically wood pulp,
It is a porous material composed of natural fibers such as hemp, mitsumako or kozo, and chemical fibers such as rayon, vinylon, nylon, polyester, polyphenylene sulphite and acrylonitrile. These fibers can be used alone or in combination of two or more kinds. The sheet of porous support can be made wet or dry. The basis weight is not particularly limited, but is 3 to 20 g / in terms of ink consumption, strength, and ease of handling.
m ² and preferably about 5 to ²⁰ g / m ² are suitable, and among these, especially thin paper with a low basis weight of 10 g / m ² or less and household thin paper with low paper strength (tissue paper,
When using toilet paper, etc., a particularly remarkable effect is exhibited.

The composition or characteristics of the heat perforated film of the present invention are not particularly limited, but any one can be used as long as it can be perforated and contracted by a heating operation during plate making. Specific examples include polyethylene, polyolefin films such as polypropylene, polystyrene films, polyester films such as polyethylene terephthalate, polyvinyl chloride films, polyvinylidene chloride films, polyvinylidene fluoride, and the like. A polyester film is used. The thickness of the film is generally 0.3 µ to 8 µ, preferably 0.5 µ to 2.0 µ.

The adhesive used for laminating the porous support and the heat-perforated film may be any adhesive as long as it can adhere the porous support and the heat-perforated film, and examples of the adhesive made of a thermoplastic resin include polyester resins. , Polyvinyl acetate resin, ethylene / vinyl acetate copolymer resin,
Emulsion type such as polyacrylic ester resin, vinyl chloride / vinyl acetate copolymer resin, solvent type,
A solventless type, a hot melt type, an ultraviolet curing type, an electron beam curing type and the like can be used.
Examples of the electron beam or ultraviolet ray curable resin include those using reactive oligomers and monomers such as various acrylates and methacrylates. The amount of adhesive applied is 0.05 to 5 g / m ² , preferably 0.1 to ² g / m ² .
It is in the range of m ² . If the amount of adhesive applied exceeds this range, the sensitivity and image quality of the stencil sheet will deteriorate, and if it falls below this range, adhesion will be insufficient and printing durability will be poor. If necessary, additives such as antistatic agents and coatability modifiers may be used in the adhesive. The take-up speed of the heat-sensitive stencil sheet comprising the heat-perforated film and the porous support is usually 20 m / min to 200 m / min, preferably 6 m / min.
It is 0 m / min to 150 m / min.

The heat-sealing prevention layer is provided to prevent heat-sealing of a film or an adhesive or the like to a thermal head and to prevent the adhesion of dusts due to the heat-sealing. Examples thereof include agents having a releasing action such as agents and fluorine-based releasing agents, and other additives such as antistatic agents and lubricants may be used. It is effective that the heat-sealing preventive layer can retain its properties for a long period of time without being transferred to the porous support when wound in a roll shape.

The method of the present invention will be described with reference to the schematic diagram of FIG. 1 for explaining the steps of the present invention. A is a roll-shaped heat-perforated film, and this film is coated with an adhesive by a gravure roll by a gravure coater 1. Next, the heat-perforated film coated with the adhesive is guided to the winding surface of the roll-shaped porous support B and brought into pressure contact with the porous support to bond the heat-perforated film and the porous support. Immediately after the heated perforated film is pressed and the porous support is laminated on the heated perforated film, it is introduced into the dryer 3 and subjected to operations such as blowing hot air, irradiating ultraviolet rays and electron beams, and cooling with a cooling roll. To increase the initial adhesive strength of the laminate comprising the heat-penetrated film and the porous support. Next, the wire bar coater 2 is coated with a heat fusion inhibitor. Then, the heat-sensitive stencil sheet C is manufactured by performing a drying process with hot air or the like in the dryer 4.

In this operation, the heat-perforated film is coated with an adhesive, and this heat-perforated film is guided to the winding surface of the roll-shaped porous support and bonded to the porous support by pressure contact, so that the porosity is improved. The tensile force is not applied to the support more than necessary. As a result, the work of laminating a porous support having a low basis weight is facilitated, breakage and wrinkles of the support are less likely to occur, and it is possible to produce a heat-sensitive stencil sheet at a low cost and quick in starting printing. Also, it is possible to apply low-cost household thin paper.

[0011]

The present invention will be described below in detail with reference to examples. Example 1 The thermal shrinkage at 100 ° C. was 18% in the vertical direction and 19% in the horizontal direction, and the thickness was 1.
A 5 μm heat perforated polyester film was coated with a vinyl acetate resin dissolved in methanol at a rate of about 0.8 g / m ² by using a gravure roll coater. Next, the following four types of porous supports were pressed onto the polyester film at the winding surface and adhered thereto. Dryer 3
After hot air of 60 ° C is added and dried, about 0.03 g of room temperature curable silicone resin is applied to the surface of the polyester film.
/ M ² and coated with hot air at 40 ° C. -Porous support (1) Tissue paper having a basis weight of 11.8 g / m ² and thickness of 38 µm (usually used thin paper) -Porous support (2) Basis weight of 8.5 g / m ² and thickness of 20 µm Thin paper (low basis weight thin paper) -porous support (3) Household thin paper (tissue paper) with basis weight 13 g / m ² , thickness 50 μm-porous support (4) basis weight 20 g / m ² , thickness 75 μm household thin paper (toilet paper)

Comparative Example 1 Comparative Example 1 is based on the method shown in FIG. 2, in which the heat-perforated film A is coated with an adhesive by the gravure coater 1 and the porous support B is laminated with a roll. is there. A heating perforated film coated with the same adhesive as in Example 1 at the same ratio was laminated with four kinds of porous supports by a roll and then dried in a dryer 3, and a perforated film surface was formed with a wire bar coater 2. Was coated with a heat fusion inhibitor and dried in a dryer 4 to produce a heat-sensitive stencil sheet.

Comparative Example 2 Comparative example 2 is based on the method shown in FIG. Vinyl acetate resin dissolved in methanol using a gravure roll coater to four of the porous support B about 1.5 g / m ²
Coating, the heat shrinkage at 100 ℃ is 1 vertical
A heat-perforated polyester film A having a thickness of 8% and a width of 19% and a thickness of 1.5 μm was laminated by a roll, and the heat-sensitive stencil sheet C was manufactured by the same method as in Example 1 in the subsequent steps.

Comparative Example 3 Comparative Example 3 is based on the method shown in FIG. Four kinds of porous supports B coated with a vinyl acetate resin dissolved in methanol at a rate of about 1.5 g / m ² using a gravure roll coater, and a heat shrinkage rate at 100 ° C. of 18% in length and 19 in width. %, And a heat-perforated polyester film A having a thickness of 1.5 μm was bonded by pressure welding on the winding surface of the heat-perforated polyester. Subsequent steps were the same as in Example 1 to obtain a heat-sensitive stencil sheet C. The heat-sensitive stencil sheets obtained in Example 1 and Comparative Example were used as Ricoh's Preport VT.
A thermal head of -3820 was used for plate making, and printing was carried out by Ricoh's Preport VT-3820, and the results were evaluated. The obtained results are as shown in Table 1.

[0015]

[Table 1]

[0016]

According to the method of the present invention, a heat-sensitive stencil sheet having no breakage or wrinkle of the porous support can be obtained by adhering the heat-perforated film and the porous support without requiring complicated equipment. It is possible to laminate thin paper having a low basis weight, which can be manufactured, improves the start-up of printing, and enables practical use of thin paper for household use which is inexpensive.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an apparatus for performing the steps of the example.

FIG. 2 is a schematic view of an apparatus for performing the process of Comparative Example 1.

3 is a schematic view of an apparatus for performing the process of Comparative Example 2. FIG.

FIG. 4 is a schematic diagram of an apparatus for performing the process of Comparative Example 3.

[Explanation of symbols]

 1 Gravure coater 2 Wire bar coater 3 Dryer 4 Dryer A Heat-perforated film B Porous support C Heat-sensitive stencil base paper

Claims (1)

[Claims] 1. A method for producing a heat-sensitive stencil sheet by adhering a heat-perforated film and a porous support to each other, wherein the heat-perforated film coated with an adhesive is introduced to a winding surface of a roll-shaped porous support to form a porous film. A method for producing a heat-sensitive stencil sheet, which comprises laminating a heat-perforated film and a porous support by bringing them into pressure contact with a permeable support.