JPH0257035B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary stencil printing method, and more particularly to a rotary stencil printing method in which stencil printing is performed by wrapping a stencil printing base paper around the peripheral surface of a plate cylinder.

Background of the Invention As one of the stencil printing methods, stencil printing base paper is wound around the outer peripheral surface of a printing cylinder, the printing cylinder is rotated around its own central axis, and the printing paper is rotated in synchronization with the rotation of the printing cylinder. Rotary stencil printing in which the printing ink that is sent in contact with the surface of a stencil printing base paper and has passed through the perforated image area of the stencil printing base paper is transferred to the surface of the printing paper to form a printed image on the surface of the printing paper. The method is well known, and various rotary stencil printing devices that carry out this rotary stencil printing method have been proposed in the past, one of which is a patent application filed by the same applicant as the present applicant. Showa 53-
Proposed in No. 128043.

There are various types of base paper used in stencil printing, one of which is a thermoplastic synthetic resin film such as polyester film or other synthetic resin film, and a paper that is bonded to one side of the synthetic resin film. Heat-sensitive stencil printing base paper is known, which is made of a polymer with a sheet-like porous support that is permeable to ink, and this type of stencil printing base paper has carbon black on the other side of the synthetic resin film. An original sheet having an image area containing a component that absorbs heat and generates heat as shown in FIG. By irradiating a light beam, especially a light beam containing a large amount of infrared radiation, from the side, the synthetic resin film is melted by the heat generated in the image area of the original sheet, and a perforated image having a shape corresponding to the shape of the original image is formed on the synthetic resin film. The heat-sensitive stencil printing base paper has the advantage of being easily plate-made using a heat-sensitive copying method.

As an improved stencil printing paper having a new form of support, a large number of fibers are adhered to one side of a synthetic resin film, arranged substantially parallel to each other at predetermined intervals in only one direction. Such a stencil printing paper has been proposed in Japanese Patent Application No. 1983, filed by the same applicant as the present applicant. In this stencil printing base paper, a striped support is formed by a large number of fibers arranged in only one direction on one side of a synthetic resin film.
The support does not have any overlapping portions of fibers and has regular slit-like openings between each fiber, so the support is made of Japanese paper or nonwoven fabric and has irregular openings between the fibers. Alternatively, compared to a woven fabric support having grid-like openings between fibers, it has a higher light transmittance during plate making and an ink transmittance during printing, and is highly uniform. As a result, it is possible to form a punched image faithful to the original image, and to form a high-quality printed image with excellent resolution and no blurring.

However, since the above-mentioned type of stencil printing base paper does not have fibers continuous in one direction, the tensile strength in the direction perpendicular to the extending direction of the fibers is lower than in the extending direction of the fibers. , has a remarkable directionality in tensile strength. By the way, in rotary stencil printing in which stencil printing is performed by wrapping stencil paper around the circumference of a plate cylinder, the tensile force that acts on the stencil printing paper during plate placement and printing is mainly caused by the force of the stencil printing paper. It acts in the winding direction of the cylinder, that is, in the direction along the circumferential direction of the plate cylinder, and has almost no effect in other directions. Therefore, in rotary stencil printing, the stencil printing base paper, which has a directional tensile strength as described above, matches the directional tensile strength with the directional tensile resistance required during use. As a result, it can withstand printing and printing on a large number of sheets, and can be put to practical use.

Purpose of the Invention The present invention was made in the patent application filed in 1983 in consideration of the above-mentioned events.
- It is an object of the present invention to provide a rotary stencil printing method for performing stencil printing using a new heat-sensitive stencil printing base paper as proposed in No.

According to the present invention, the present invention provides a heat-sensitive stencil plate in which a large number of fibers are arranged and bonded to one side of a synthetic resin film substantially parallel to each other at predetermined intervals in only one direction. This is achieved by a rotary stencil printing method characterized in that stencil printing is performed by wrapping printing base paper around the circumferential surface of a printing cylinder so that the fibers extend in the circumferential direction of the printing cylinder.

Effects of the Invention According to the rotary stencil printing method according to the present invention, a large number of fibers are continuously extended in the same direction as the direction of the tensile force acting on the heat-sensitive stencil printing base paper at the time of plate placement and printing. Since the base paper for heat-sensitive stencil printing is attached to the printing cylinder and used, the synthetic resin film is effectively reinforced by the fibers of the base paper for heat-sensitive stencil printing, and the base paper for heat-sensitive stencil printing is used during printing or printing. There is no risk of it breaking at times.

DESCRIPTION OF EMBODIMENTS The invention will now be described in detail by way of embodiments with reference to the accompanying drawings.

FIG. 1 shows an example of the implementation procedure of the rotary stencil printing method according to the present invention. In the figure, reference numeral 1 indicates a plate cylinder, which includes a circumferential portion 2 having a porous structure, through which printing ink is supplied from a printing ink supply means (not shown) provided in the cylinder. Printing ink is supplied to its outer peripheral surface, and it is driven to rotate around its own central axis.

A base paper clamp device 3 is attached to the outer periphery of the plate cylinder 1, and the base paper clamp device selectively locks one end edge of the heat-sensitive stencil printing base paper 4 along one generatrix of the plate cylinder 1. I'm starting to do that.

As clearly shown in FIG. 2, the stencil printing paper 4 is arranged in one direction on one side of the synthetic resin film 5, substantially parallel to each other and at predetermined intervals. Each of the fibers 6 is bonded to one surface of the synthetic resin film 5 by an adhesive 7.

The synthetic resin film 5 may be any material that can be thermally melted or changed to form a perforated image, such as polypropylene film, polyester film, acetate film, polycarbonate film, vinylidene chloride vinyl chloride copolymer resin film, polychloride film, etc. It may be a single layer or a multilayer of vinyl, polyethylene film, polystyrene film, etc., and preferably has a film thickness of 0.02 mm or less for thermal plate making.

The fibers 6 may be synthetic resin fibers such as polyester fibers, natural fibers such as silk, or metal fibers, and the fiber diameter is determined to greatly reduce light transmittance during plate making and printing ink passage rate during printing. The fibers may have a required tensile strength and a size that does not melt when irradiated with light during plate making, and the fiber diameter is 1.
It is preferably about 0.01 mm. The distance between adjacent fibers 6 is preferably large in order to improve the light transmittance during plate making and the printing ink transmittance during printing, but if it is too large, the synthetic resin film 5 may be reinforced. In addition, synthetic resin film 5 is not used during plate making.
is pressed directly to the stage glass between the fibers,
As a heat insulating air layer is no longer formed between the stage glass and the synthetic resin film 5, the heat generated in the image area of the original sheet is dissipated to the stage glass, and this heat is effective for thermal changes in the synthetic resin film 5. As a result, the perforated image cannot be formed well on the synthetic resin film 5, and the inner part of the perforated image having a closed loop part, such as the letters O and P formed on the synthetic resin film 5, cannot be retained. , the spacing between adjacent fibers is usually 2
It is required to be less than mm.

The adhesive 7 for bonding the fibers 6 to the surface facing the synthetic resin film 5 may be, for example, a vinyl acetate adhesive, an acrylic adhesive, a polyvinyl chloride adhesive, or the like. The adhesion of the fibers 6 to the synthetic resin film 5 by the adhesive 7 may be carried out by applying the adhesive 7 in a layer on one side of the synthetic resin film 5 in a wet lamination method, or by applying the adhesive 7 to the fibers 6. The dry lamination method may also be used.

As shown in FIG. 1, the heat-sensitive stencil printing base paper 4 has fibers 6 on the outer peripheral surface of the plate cylinder 1, with the fiber 6 side being the joint surface with the plate cylinder 1. It is wound to extend in the circumferential direction.

Heat-sensitive stencil printing base paper 4 and its fibers 6 are plate cylinder 1.
By wrapping the heat-sensitive stencil printing base paper 4 around the outer circumferential surface of the plate cylinder 1 so as to extend in the circumferential direction of the plate cylinder 1, the heat-sensitive stencil printing base paper 4 is wrapped around the outer circumferential surface of the plate cylinder 1 during printing and after printing. The direction of the tensile force acting on the base paper 4 matches the extending direction of the fibers 6, and the reinforcing effect of the synthetic resin film 5 by the fibers 6 prevents the synthetic resin film 5 from tearing due to the tensile force. Ru.

As shown in FIG. 3, the heat-sensitive stencil printing base paper 4 is cut to an appropriate length and has one edge of the base paper cut in a direction perpendicular to the extending direction of the fibers 6, that is, the fibers 6 are arranged. A cut sheet type having attachment ears 8 extending along the direction, or a roll wound around a roll core 9 along the extending direction of the fibers 6, as shown in FIG. These can be of any type and are used in carrying out the rotary stencil printing method according to the invention.

Although the present invention has been described in detail with respect to specific embodiments above, the present invention is not limited thereto, and various embodiments are possible within the scope of the present invention. It will be clear to those skilled in the art.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view showing an example of the implementation procedure of the rotary stencil printing method according to the present invention, and FIG. 2 is a partial view of a heat-sensitive stencil printing base paper used in implementing the rotary stencil printing method according to the invention The enlarged sectional view, FIGS. 3 and 4 are perspective views showing heat-sensitive stencil printing base paper used in carrying out the rotary stencil printing method according to the present invention. 1... Plate cylinder, 2... Peripheral part of porous structure, 3...
Base paper clamp device, 4...Base paper for heat-sensitive stencil printing, 5...Thermoplastic synthetic resin film, 6...Fiber, 7...Adhesive, 8...Mounting ear portion, 9...Roll core.

Claims (1)

[Claims] 1 Heat-sensitive stencil printing base paper in which a large number of fibers are arranged and adhered to one side of a synthetic resin film in a manner substantially parallel to each other at predetermined intervals in only one direction, and the fibers are attached to the periphery of the plate cylinder. A rotary stencil printing method characterized in that stencil printing is performed by wrapping the stencil around the peripheral surface of a printing cylinder so as to extend in the direction.