JPS6087095A - Thermal stencil paper - Google Patents

Abstract

PURPOSE:To obtain a stencil paper capable of obtaining a perforated image which is highly accurate reproduction of the original image, by a method wherein a paper obtained by arranging a multiplicity of fibers in parallel on one side of a synthetic resin film and adhering the fibers is used as a thermal stencil paper from which a stencil is made by a thermal copying system. CONSTITUTION:A multiplicity of fibers 3 having a fiber diameter of about 1- 0.01mm. are arranged in parallel on and adhered to one side of a synthetic resin film 2 capable of being provided with perforated images by thermal change, e.g., a polypropylene film or a polyester film, preferably, having a thickness of not larger than 0.02mm.. The spacing between adjacent ones of the fibers is not larger than 2mm.. The adhesion is conducted by applying an adhesive 4, e.g., a vinyl acetate adhesive or an acrylic adhesive, to the film 2 or the fibers 3. To make a stencil from the stencil paper 1 thus obtained, the original 5 is laminated on the film 2 side of the stencil paper 1, the laminate is pressed between a stage glass 6 and a pressure plate 7, and is irradiated with infrared rays or the like from the glass 6 side to generate heat at an image part 5a, thereby providing a perforated image in the film 2.

Description

Detailed Description of the Invention The industrial field of application relates to heat-sensitive stencil printing base paper used in stencil printing, and particularly to a synthetic resin film and a support bonded to one side of the synthetic resin film. It relates to a heat-sensitive stencil printing base paper made of a polymer with a body.

BACKGROUND OF THE INVENTION One of the base papers for stencil printing is a thermoplastic synthetic resin film such as a polyester film or other synthetic resin film, and an ink-permeable sheet [--shaped] adhered to one side of the synthetic resin film. Heat-sensitive stencil printing paper made of a polymer with a porous support is known, and this type of stencil printing paper absorbs heat like carbon black on the other side of the synthetic resin film and generates heat. An original sheet having an image surface containing a component is superimposed with the image surface as the joint surface with the synthetic resin film, and light, especially infrared rays, is applied from the porous support side while the original sheet is in tight contact with the original sheet. The synthetic resin film melts or changes due to the heat generated in the image area of the original sheet by being irradiated with a light beam containing a large amount of light, and a perforated image having a shape corresponding to the shape of the original image is created in the synthetic resin film. The heat-sensitive stencil printing base paper has the advantage that it can be easily plated using a heat-sensitive copying method.

A sheet-like porous support adhered to one side of the synthetic resin film of the heat-sensitive stencil printing base paper is used to reinforce the synthetic resin film and to form closed loop portions like the letters O and P formed on the synthetic resin film. It is essential to prevent the inner part of the perforated image from falling off, and the combination of heat-sensitive stencil printing III type paper and manuscript sheet 1 is a light transmitting plate called stage glass. In the case of plate making by light beam black printing, the heat generated in the image area of the original sheet 1- placed between the synthetic resin film and the stage glass can be dissipated to the stage glass. It is useful because it forms a heat insulating layer that prevents the formation of a perforated image, and acts so that the heat generated in the image area is well transmitted to the synthetic resin film, thereby contributing to the formation of a perforated image.

Conventionally, Japanese paper, nonwoven fabric, woven iro (screen mesh), etc. have been used as porous supports for heat-sensitive stencil printing base papers of the type shown in (a) above. As mentioned above, the porous support forms a heat insulating layer and effectively contributes to the formation of perforated images, but at the same time it reduces the transmittance of light rays for plate making.
In the case of non-woven fabric, the thickness of the 4M lit and the size, shape, and distribution of the porous openings are uneven, and the number of overlapping fibers in the thickness direction is irregular, so the light rays are The transmittance is non-uniform and low, which is not desirable for forming a perforated image faithful to the original image on the synthetic resin film. Furthermore, porous supports such as books (a) obstruct the passage of printing ink during printing, causing smearing in printed images, and having an undesirable effect on obtaining high-quality printed images.

The heat-sensitive stencil T7+ printing paper using a porous support made of woven fabric is based on the thickness of the fibers of the porous support.

The size, shape, and division of the porous opening are uniform, and the fibers do not overlap irregularly in the thickness direction. Compared to stencil printing base paper, it has a uniform and high light transmittance, forms good perforated images, and has high resolution.
It is possible to form a delicate and clear printed image with less blurring.

However, the woven fabric for the porous support used in the heat-sensitive stencil printing base paper generally has a fiber diameter of 0.01 to 0.
．． 11Iln1 cap RB Ig relatively high mech]
-C is produced by spinning and weaving, so production = 1 stroke, and this reduces the cost of heat-sensitive stencil printing base paper whose porous support is made of the woven fabric. The price has soared compared to the base paper for stencil printing.

Purpose of the Invention The present invention aims at reinforcing the synthetic resin film, preventing the inner part of the perforated image that holds the closed loop part from falling off, and improving uniformity without significantly impeding the transmission of light rays during plate making and the passage of printing ink during printing. The purpose of the present invention is to provide a heat-sensitive stencil printing base paper that forms a heat-insulating layer with excellent heat resistance and includes a support of a new type with excellent productivity. According to the present invention, a large number of fibers are arranged substantially parallel to each other at predetermined intervals in only one direction and adhered to one surface of a synthetic resin film. This is achieved by using a heat-sensitive stencil printing base paper which is characterized by the following characteristics.

Effects of the Invention In the heat-sensitive stencil printing base paper constructed as described above, a striped support is formed by a large number of fibers arranged in only one direction on one side of the synthetic resin film. The support does not have any overlapping parts, and has regular slit-like openings between the fibers, so that the lattice-like gaps 1-1 are formed between the fibers. Compared to cloth supports, the light transmittance during N printing and the printing ink transmittance during printing are higher, and they are more uniform, which makes this base paper suitable for original documents. Forms a perforated image that is faithful to the image,
It has excellent resolution and can form high-quality printed images with no blurring. The support of the heat-sensitive stencil printing Kawahara paper according to the invention is composed of unidirectionally arranged fibers, which have a perforated image forming a closed loop section by suitably determining the spacing between the fibers. Holds the inner part of the holder and effectively prevents it from falling off. Since this support is composed of fibers arranged in stripes in only one direction, there is no need for spinning, and since the fibers are arranged in stripes in only one direction, it can be easily produced. It has superior properties compared to screen mesh, and does not increase the cost of stencil printing base paper.

Since the heat-sensitive stencil printing base paper J in the present invention has continuous fibers in only one direction, the tensile strength in the direction perpendicular to the extending direction of the fibers is higher than in the extending direction of the fibers. However, the direction of the tensile force acting on the stencil printing paper during printing is the printing direction, for example, when the stencil printing paper is used wrapped around the plate cylinder of a rotary printing press, the tensile force is mainly applied to the stencil paper. The tensile strength is only in one direction along the circumferential direction of the plate cylinder, and therefore the tensile strength actually required for stencil printing base paper is only in one direction.Therefore, the direction in which the fibers extend is Depending on the conditions, the heat-sensitive stencil printing base paper of the present invention has the minimum necessary strength by appropriately selecting the strength.

In the heat-sensitive stencil printing base paper of the present invention, if the synthetic resin film has a property of melting under heat like a thermoplastic synthetic resin film, the perforation image corresponding to the original image formed by melting A bridge that partially connects and covers the two machine bases is formed between adjacent fibers by melting the synthetic resin film for 1 hour, which prevents the fibers from moving laterally in the perforation image, and also prevents the fibers from moving laterally in the perforation image. The fibers are reinforced by the entanglement of the remaining melted synthetic resin film.

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

1 and 2 show one embodiment of the heat-sensitive stencil printing base paper according to the present invention. In the figure, reference numeral 1 indicates a heat-sensitive stencil printing base paper of the present invention, and the heat-sensitive stencil printing base paper comprises a synthetic resin film 2 made of thermoplastic or its properties, and one of the synthetic resin films 2. A large number of fibers 3 are arranged in one direction substantially parallel to each other at predetermined intervals, and each of the fibers 13 is adhered to one surface of the synthetic resin film 2 by an adhesive 4. .

The synthetic resin film 2 may be any film that forms a perforated image through thermal changes such as melting, such as polypropylene film, poly 1 ster film NOA L! Monolayer or multilayer film such as date film, polycarbonate film, salt-vinyl chloride-vinyl chloride composite resin film, polyvinyl chloride, polyethylene film, polystyrene film, etc., film for thermal plate making. 〃
It is preferable that the V'a carpet is drawn with a length of 0.02Il1m or less, and the V'a carpet 1t3 is a synthetic resin fiber such as a Borislaid fiber, a natural fiber such as silk, or a metal fiber. The fiber diameter may be such that it does not significantly reduce the light transmittance during plate making and the passage rate of printing ink during printing, has the required tensile strength, and does not melt when irradiated with light during plate making, This is preferably about 1 to 0.011 II m of melon.

The distance between adjacent fibers 3 is preferably large in order to improve the transmittance of light during plate making and the transmittance of printing ink during printing. When the synthetic resin film 2 is pressed directly against the stage glass between the fibers, a heat insulating air layer is no longer formed between the first lath of the stay and the synthetic resin film 2, causing the image area of the original to shift. The generated heat dissipates to the stage crow, and the heat no longer contributes usefully to the perforation of the synthetic resin film 2 due to thermal effects, and a good perforation image is no longer formed on the synthetic resin film 2, and the synthetic resin film 2 Since the inner part of the perforation image, which excludes the closed loop part formed in 2, is no longer retained, the spacing between adjacent fibers is generally required to be 2n+m or less.

The adhesive 4 that adheres the weave 3 to one side of the synthetic resin film 2 may be, for example, a vinyl acetate adhesive, an acrylic adhesive, a polyvinyl chloride adhesive, or the like. adhesive 4
The adhesion of the fibers 3 to the synthetic resin film 2 may be carried out by applying the adhesive 4 in a layer on one side of the synthetic resin film 2 in a wet lamination method, or by applying the adhesive 4 to the fibers 3 and dry lamination. It may also be done formally.

The plate making of the heat-sensitive stencil printing base paper 1 is performed by bonding the image surface of the heat-sensitive stencil printing base paper 1 to the synthetic resin fill 112 side of the heat-sensitive stencil printing base paper 1, as shown in FIG. IF32, for example. Blend the polymer with the placed original sheet 5 and the stage glass with the heat-sensitive stencil printing base paper 1 facing the stage glass 6!・-Sire 1- (Press plate)
7 and press the stage glass 6 in this suppressed state.
This is carried out by irradiating the polymer with a light beam containing a large amount of infrared radiation from the side of the polymer. When the polymer is irradiated with a light beam 8 containing a large amount of infrared radiation, a larger amount of light energy is absorbed in the image area 5a of the original sheet 5 than in other parts, and this instantaneously changes into thermal energy. and image section 5a
begins to develop a fever.

Since the support of the synthetic resin Noilum 2 of the heat-sensitive stencil printing base paper 1 is only the #Ii strip 3 arranged in stripes, the light rays 8
The transmittance of the heat-sensitive stencil printing base paper 1 is extremely high, so that the image area 5a of the document sheet 1-5 is irradiated with a relatively large amount of light, thereby melting the synthetic resin film 2 onto the image area. Sufficient heat is generated for 1.1 cores to perforate the holes or other thermal effects. The heat generated in the image area 5a is transferred to the synthetic resin film 2 that is in close contact with the image area 5a, so that the image area 5 of the synthetic resin film 2
The part of the thermoplastic synthetic resin film 2 that is in close contact with the original image area 5a is perforated by melting or thermal influence, and as shown in an enlarged view in FIG. A picture (!G19 is formed.

As clearly shown in FIG. 2, the fibers 3 form a heat insulating air layer 10 between the synthetic resin film 2 of the heat-sensitive stencil printing base paper 1 and the stage glass 6 during plate making. The heat transferred from the image area 5a of the document sheet 1-5 to the synthetic resin film 2 through this insulating air layer is transferred to the stage glass 6.
This prevents the heat from escaping and allows highly energy-efficient thermal platemaking.

When the distance between adjacent fibers 3 becomes narrow, the synthetic resin film 2 comes into direct contact with the stage glass 6 between the fibers, so the distance between adjacent fibers is set with this in mind. It is preferable that the material is the same, and this differs depending on the material of the Russi V-Play 1 and 7, the material of the original sheet 5, etc.

If the synthetic resin film 2 is a thermoplastic material, such as hot melt (111), as shown in FIGS. 3 and 4, the perforated image 9 of the synthetic resin film 2 (
In this case, the melted residue 11 of the synthetic resin film 2 becomes entwined with the fibers 3, and a bridge 12 is formed between the fiber sets 3 adjacent to the melted residue and the fibers 3 to partially connect the two. Nazu.

This bridge 12 ensures mechanical strength in the direction perpendicular to the extending direction of the fibers 3 in the perforated image 1'JI9 of the heat-sensitive stencil printing base paper 1. The bridges 12 formed by the melted residue 11 of the synthetic resin film 2 are formed by adjacent m
The larger the interphase distance, the more difficult it is to form a bridge, and in order for this bridge to be formed effectively, the distance between adjacent fibers must be 0.5 mm or less, although it varies depending on the material of the thermoplastic synthetic resin film and the film thickness. It's good to have something. Therefore, in order to meet all requirements in a double series, the spacing between adjacent fibers may more preferably be 0.5 mm or less.

Using the heat-sensitive stencil printing base paper 1 prepared as described above, U
(When L-plate printing is performed, there is very little in the perforated image 9 that impedes the passage of printing ink, so a clear R1+ printed image that is faithful to the original image (but not covered) can be obtained. You will be able to do it.

(Example) A unidirectional striped array J of 526 pieces of poly 1 sprue woven navy blue with a fiber diameter of approximately 0.04 mm and an inter-fiber spacing of 0.15 mm.
It was created. Above) Polynisdel film with a thickness of 0.003 mm is superimposed on the unidirectional striped array of R@ fibers prepared as shown in E. Adhesive solution (methanol 82 .5 wt % and polyvinyl acetate adhesive 7.5 wt %) was applied and dried to prepare a heat-sensitive stencil printing base paper of the present invention. The solid content of the adhesive (m) was 1.96 g/cmQ.

The base paper for heat-sensitive stencil printing created as described above was superimposed on a newspaper as a manuscript sheet, and the plate was made using a base paper plate making machine (RISOGRAPH FX7200, manufactured by Riso Kagaku Kogyo Co., Ltd.),
When printed on a mimeograph rotary press (Risograph AP7200, manufactured by Riso Kagaku Kogyo Co., Ltd.), we were able to obtain printed matter that faithfully corresponded to both newspaper images and had an extremely clear and unfaded printed image.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing one embodiment of I3i paper for heat-sensitive stencil printing made by Mokkomei, and Fig. 2 is a cross-sectional view showing the base paper for heat-sensitive stencil printing according to the present invention and its plate-making operation state. Figure 3 is a partially enlarged cross-sectional view of the heat-sensitive stencil printing base paper on which the perforated image is formed after being made, and Figure 4 shows the perforated image portion of the heat-sensitive stencil printing base paper that has been made through the plate. FIG. DESCRIPTION OF SYMBOLS 1... Heat-sensitive stencil printing base paper, 2... Synthetic resin film, 3... Fiber, 4... Adhesive, 5... Manuscript sheet. 5a... Image section, 6... Stage glass, 7...
Brassile plate, 8... Light beam, 9... Perforation image, 'I O... Insulating air layer, 11... Melting residual of thermoplastic synthetic resin film, 12... Bridge special r[ Applicant: Representative of Riso Fi Gaku Kogyo Co., Ltd.
Person Patent Attorney Masaki AkashiFigure 1Figure 2:)O1υ

Claims (1)

[Claims] (1) A heat-sensitive stencil printing base paper characterized in that a large number of fibers are arranged and adhered to one side of a synthetic resin film, substantially parallel to each other at a predetermined interval, 13, in only one direction. (2. The heat-sensitive stencil printing base paper according to claim 1, wherein the distance between the adjacent fibers is 2111111 or less.