JPS63128995A - Thermal stencil printing base paper and production thereof - Google Patents

Abstract

PURPOSE:To obtain a base paper free from the fusing to an original in the process due to flash irradiation and capable of being sharply perforated over a wide output range and making sharply printed matters without ink-bleeding etc. even in the printing of a number of sheets, by a method wherein a thin layer of a fluorine polymeric resin having perfluoroalkyl group on the side chain with a specific range of solid content is formed on the surface of a film. CONSTITUTION:A fusion bond-preventive coating agent, which is a fluorine polymeric resin having perfluoroalkyl group at the side chain, takes remarkable effect in very thin layer form, thus being coated to be a thin layer with a 0.005-0.5 g/m<2> solid content. In-line coating is the most suitable method ; in which the fusion bond- preventive agent is coated on a so-called unstretched film obtained by fusion-extruding a thermoplastic resin in film form and the coating film is biaxially simultaneously oriented, or the said fusion bond-preventive agent is coated on a uniaxial oriented film and the substrate film and the coating layer are oriented together biaxially simultaneously or in a direction right angles to the orientation of the previous stage. Successively, the film is coated with an adhesive on the non-coating side thereof to be laminated on a porous base material such as a tissue.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention involves placing an original in close contact with the film side of a base paper made of a thermoplastic resin film and a porous support, and irradiating a flashlight from the support side. The present invention relates to a heat-sensitive stencil mill and printing base paper suitable for a plate-making method in which holes are perforated in a short time using light and heat exchange, and a method for manufacturing the same. For more details, please refer to "Preventing fusion with the manuscript during plate making."

To provide an excellent base paper for heat-sensitive stencil printing, which allows clear perforations to be obtained and a large number of clear printed matters to be stably obtained.

(Prior Art) Conventionally, one of the problems with this type of heat-sensitive stencil is that the base paper fuses to the manuscript during plate-making, especially.

When a manuscript copied by a PPC copying machine is used as an original to make a plate, the base paper tends to fuse to the manuscript due to the resin used in the toner, and when peeled off, the manuscript is often damaged or efficiency is reduced.

As a method for preventing this fusion, various proposals have been made to provide a fusion-preventing coating layer on the surface of the film that comes into contact with the document. For example, JP 43-10093, JP 47-5139, JP 48-1009, JP 48-1531, JP 48-3057.
Examples include Publication No. 0. The anti-fusing agents proposed for these are inorganic fine powders and lubricants.

These include surfactants, silicones, etc. Among these conventional techniques, only silicone is actually effective for fusion bonding, and is limited to reactive silicone because it does not want to transfer to a porous support, but it is sufficient despite the low processing efficiency. Furthermore, it is difficult to obtain a clear perforation because the silicon layer inhibits heat transfer. Regarding this problem, Japanese Patent Application Laid-Open No. 59-2895 proposes a method of mixing or dissolving a coloring agent into the coating layer to prevent fusion, but the effect was insufficient.

(Problems and Means to be Solved by the Invention) The object of the present invention is to provide a wide output range in which clear perforations can be obtained without fusion to the original in plate making using flash irradiation, and even when printing a large number of sheets without smearing. To provide an excellent base paper for heat-sensitive stencil printing which can stably produce clear printed matter without ink bleeding etc. The technical point is to efficiently provide a fusion prevention layer on the film surface that is sufficiently thin without inhibiting heat conduction, has an excellent fusion prevention effect, and does not cause show-through.

The gist of this is that in a base paper for heat-sensitive stencil printing made by laminating a thermoplastic resin film and a porous support, a solid material made of a fluoropolymer resin having a perfluoroalkyl group in the side chain is attached to the surface of the film. Type o, o o
s~0. ! M'//rr? It is a base paper for heat-sensitive stencil printing made by flash irradiation, characterized by having a thin layer of irradiation with flash light, in which a biaxially stretched polyester film can be advantageously used as the thermoplastic resin film, and furthermore, as the manufacturing method thereof. An emulsion or solution of a fluoropolymer resin having a perfluoroalkyl group in the side chain,
Coating one side of an unstretched film or a thermoplastic resin film stretched in only one direction, followed by drying, simultaneous biaxial stretching or stretching in a direction perpendicular to the stretching direction, and heat setting to form a biaxially stretched film. , a method for producing a base paper for heat-sensitive stencil printing made by flash irradiation, characterized by laminating a porous support to the non-coated surface of the film.

(Function) The thermoplastic resin film in the present invention is a polyolefin and its copolymer, polyvinyl chloride and its copolymer, and polyvinyl chloride=+7dene copolymer.

The targets are films made of polyester and its copolymers, polyamides and its copolymers, etc., but they require extremely thin films, mechanical properties are required in the lamination process, and there are problems during the film manufacturing process. A biaxially stretched film is preferred because it is easy to obtain an extremely thin anti-fusion layer on the surface of the film, and a biaxially stretched polyester film is particularly effectively applied.

The coating agent for preventing fusion in the present invention is as follows.

A fluoropolymer resin having a perfluoroalkyl group in the side chain, which has a structure represented by the following formula [(1), ([1) or (I)] as its general formula. R3R2 (1) (n) t-N 0 = S = O 1' R1: H or an alkyl group having 10 or less carbon atoms R2: Alkylene group having 10 or less carbon atoms R3: Perfluoroalkyl group having 10 or less carbon atoms n: 5
In addition to an integer of 0 or more, methacrylic acid, methacrylic ester, acrylic acid, acrylic ester, etc. can be selected as the copolymerization component. These resins can be used in the form of an aqueous emulsion or solution.

The coating agent of the present invention may contain a stabilizer for the coating liquid, an inorganic fine powder for adjusting the slipperiness of the film, an antistatic agent, etc., as necessary, to the extent that its functions are not impaired. .

The anti-fusing coating agent in the present invention is:

〈A remarkable effect can be obtained with a thin layer, and the solid content is 0.00.
5~0.511/lr? , preferably 0.01 to 0.
11/- is fine.

If the amount of coating exceeds 0.51/lrl, heat conduction will be inhibited during perforation by flash light, so the effect of the present invention will be poor; if the amount of coating is less than 0.0051/d-, it will be uniform. It is difficult to obtain a strong coating, and the effect of preventing fusion is poor.

Next, a method for producing a heat-sensitive stencil printing base paper according to the present invention will be described.

The heat-sensitive stencil printing base paper of the present invention can be produced by coating one side of a thermoplastic resin film with the coating liquid and then laminating a porous support to the non-coated side of the film, or by bonding a porous support with a thermoplastic resin film. After the adhesive support is laminated, the film surface is coated with the coating solution. Although it can be manufactured by a so-called post-coating method, a method of applying an extremely thin film to prevent fusion during the film manufacturing process is advantageous in order to exhibit the effects of the present invention.

That is, in the method of the present invention, a thermoplastic resin is melt-extruded into a film. Either a so-called unstretched film is coated with the anti-fusing agent and the coated film is stretched simultaneously in the longitudinal and transverse directions, or the unstretched film is pre-stretched in one direction, longitudinally or transversely, and then the anti-fusing agent is applied to a uniaxially stretched film. This is an in-line coating method in which the base film and the coating layer are stretched simultaneously in the vertical and horizontal directions or in a direction perpendicular to the previous stage stretching, and it is possible to uniformly and efficiently form an anti-fusing layer of the minimum necessary thickness without inhibiting heat transfer during plate making. This is the best method to install it often.

By stretching the coating film and the base film together after coating in this way, a film with extremely good adhesion of the coating film to the base film can be obtained. Moreover, since coating can be performed at a thickness that is twice the subsequent stretching surface magnification as compared to the final target thickness, it is not necessary to extremely lower the coating liquid concentration or to use a special coating method for thin coating. Examples include Eva, / labial roll method, and inverse roll method.

A reverse roll method, a Meyer bar method, an air knife method, etc. may be employed.The coating layer and the base film are co-stretched and heat set to provide thermal dimensional stability to withstand post-processing steps.

The most important feature of the present invention is that the anti-fusing layer is a polymer film, and that it can be coated in-line on the base film without anchor treatment. The reason why the adhesion to the base film is good even without an anchor coat is thought to be due to the molecular structure of the coating resin. In other words, it is thought that integration with the base film progresses through a process in which the hydrocarbon chains in the molecular chains of the coating agent have a large interaction with the carbon- or hydrogen-based molecules of the base film and undergo deformation together. . Further, it is presumed that the anti-fusion effect is due to the molecular structure of the side chain made of fluorocarbon in the coating agent. Furthermore, the anti-fusing layer of the present invention has the form of a polymer film, which prevents the anti-fusing agent from peeling off or migrating to the back side, which occurs with low-molecular compounds such as surfactants, and makes it porous during printing. There is no problem with ink penetration from the support side.

The stencil printing base paper of the present invention is produced by a conventional method from a thermoplastic resin film coated with the anti-fusing agent and a porous support. That is, an adhesive such as a saturated polyester resin, vinyl acetate resin, vinyl chloride resin, acrylic resin, or urethane resin is applied to the non-coated side of the thermoplastic resin film coated with the anti-fusing agent.

It is manufactured by bonding it to a porous support such as tissue paper.

(Example) The present invention will be explained in more detail below based on two examples.

Example 1 150% of an aqueous emulsion of perfluoroalkyl acrylate resin (manufactured by Asahi Glass ■, Asahi Guard AG-710, resin solid content 15 wt) was applied to an unstretched polyester film with a thickness of 25 μm as an anti-fusing coating agent. Coated with Metsushier's gravure roll, dried at 60°C, preheated to 85°C, and heated to 13.0 times the N at the same temperature.
It was simultaneously biaxially stretched to 3.3 times the width and then heat treated at 225°C for 5 seconds to 1ζ. The obtained film has two sides with 0.061
It is a 2.5μ biaxially oriented and stretched polyester film with a 1/d anti-fusing agent layer. Vinyl acetate resin (Konishi (produced bond KE-15) was applied to the non-coated side of the film.
0) dissolved in methyl ethyl ketone at a solid concentration of 10%
An adhesive of 2 was applied and the paper was bonded to porous tissue paper having a basis weight of 9.5 ji/ml. The amount of adhesive applied is 2.011/n? Met.

The thermal stencil printing base paper obtained in the above process was used as an original to make a plate using a thermal stencil printing machine (Lingraph FX 7200, manufactured by Riso Kagaku Kogyo ■). The original and the heat-sensitive stencil paper could be peeled off very easily without any resistance. When this plate was used to print using a stencil printing machine (Lingraph AP 7200 manufactured by Riso Kagaku ■), clear prints were obtained from the beginning of printing.
Even after printing more than 3,000 sheets, no bleeding occurred at all, and stable printed matter was obtained without horizontal lines gradually becoming thicker.

Comparative Example 1 A heat-sensitive stencil printing base paper was produced in the same manner as in Example 1 using a biaxially stretched polyester film obtained in exactly the same manner as in Example 1 except that the anti-fusing agent coating was not applied, and it was similarly used in practical use. We conducted an evaluation.

The peeling resistance between the manuscript and the stencil plate after making the plate is high.

Local adhesion to the original occurred even after careful peeling.

The printed matter is missing (for example, the part where the beginning of the 9th day of the garden becomes -)
occurred frequently, and bleeding due to tears during peeling (for example, the part where "f" was observed) was observed.Also, after 500 copies were printed, the image smeared all over, the lines became thicker, and the image was different from the initial prints. It became something.

Comparative Example 2 Two-wheel stretched polyester film with a thickness of 2.5μ and a basis weight of 9
．． 5! i/? The porous thin paper was laminated in the same manner as in Example 1. Next, a water-soluble silicone oil (Nippon Unicar Co., Ltd. (Kiku Seibu L-
7001') was coated, dried and rolled up. The coating thickness was approximately 1.3117 d. As a result of evaluating the obtained thermal stencil printing base paper in the same manner as in Example 1, it was found that the adhesion to the manuscript during plate making was slight compared to Example 11 (compared to that of Example 11), but it was insufficient at a practical level, and there was no leakage in printing. Also missing (for example, day is day, the part where [ becomes "")
occurred, and a satisfactory printed matter could not be obtained. It is thought that the anti-fusing agent was transferred to the tissue paper side on the back side in the form of an artifact.

Comparative Example 3 Biaxially stretched polyester film with a thickness of 2.5μ and a basis weight of 9
．． 511/rr? The porous thin paper was laminated in the same manner as in Example 1. Next, a methyl ethyl ketone solution of a room temperature curing silicone resin (5R2411 manufactured by Toshi Silicone ■) was coated on the film surface of this base paper using the Mikevar method and dried to form an entertainment. In order to reduce the amount of coating as much as possible, the solution concentration was lowered and 1 ton was set as the limit at which coating could be applied uniformly in appearance. The coating weight was approximately 1.311/-. After coating and rolling up, it was left at room temperature for 3 days, unrolled and cut to make thermal stencil printing base paper. As a result of evaluating the obtained thermal stencil printing base paper in the same manner as in Example 1, it was found that it was relatively easy to peel off the base paper after plate making, but there was a loss in the initial printing stage (test printing until the density of the entire printed matter was uniform). There are many.

The image showed areas where there was insufficient perforation. Peeling resistance was felt when the plate was made again by increasing the output.

There were holes and tear marks in the printed matter.

Example 2 An unstretched polyester film with a thickness of 35 μm was roll-stretched 1.4 times in the machine direction at 80°C, and a water-based perfluoroalkyl acrylate resin was applied as an anti-fusing coating agent to one side of the longitudinally-axially stretched film. Emulsion (manufactured by Asahi Glass ■, Asahi Guard AG-730° resin solid content 15wt
4) was coated in the same manner as in Example 1, dried, preheated to 100°C, and simultaneously biaxially stretched and heat treated at 95°C under the conditions of Example 10 to give a film of 0.061//I?
A film having a thickness of 2.5 μm was obtained having an anti-fusing agent layer. Using this film, it was laminated with thin paper in the same manner as in Example 1 to produce a heat-sensitive stencil printing base paper, and a practical test of plate making and printing was conducted.

As in Example 1, it is extremely easy to separate from the original.

There were no holes or tears in the printed matter, and more than 3,000 clear and stable printed matter were obtained.

Example 3 An unstretched polyester film with a thickness of 35 μm was stretched vertically at 82° C. for 3.5@rolls, and 200 meshes of the same perfluoroalkyl acrylate resin aqueous emulsion as in Example 1 was applied to one side of the fir-axis stretched film. The film was coated with a gravure roll, dried, and then stretched 4.0 times in the transverse direction at 90 DEG C. to obtain a 2.5 .mu. thick film having an anti-fusing agent layer of 0.0611/-.

Using this film, a thermosensitive stencil printing base paper was prepared by laminating it with thin paper in the same manner as in Example 1, and a practical test of plate making and printing was conducted. As in Example 1, there was no peeling from the original, and there were no missing or torn prints, and more than 3,000 clear prints were stably obtained.

(Effects of the Invention) The heat-sensitive stencil printing base paper according to the present invention has good peelability because it does not fuse to the original during perforation plate making by flash irradiation, and there are no defects such as omissions or tear marks in printing, and , the initial loss is small, and clear images with constant density can be obtained even when printing a large number of sheets. This effect is achieved by uniformly coating the surface of the film with a specific polymer coating that has excellent adhesion prevention properties.
Moreover, it is made thin enough so as not to inhibit heat transfer, and can be realized industrially and efficiently by coating it before the final stretching during the film manufacturing process.

Claims (3)

[Claims] (1) In a heat-sensitive stencil printing base paper made by laminating a thermoplastic resin film and a porous support, the solid content is 0.0. 005~0.5g/m^2
A base paper for thermal stencil printing made by flash irradiation, characterized by having a thin layer of. (2) The base paper for heat-sensitive stencil printing according to claim 1, wherein the thermoplastic film is a biaxially stretched polyester film. (3) An emulsion or solution of a fluoropolymer resin having a perfluoroalkyl group in the side chain is coated on one side of an unstretched film or a thermoplastic resin film stretched in only one direction, and then dried and then A thermosensitive plate made by flash irradiation, characterized in that it is axially stretched or stretched in a direction perpendicular to the stretching direction, heat-set to form a biaxially stretched film, and a porous support is laminated on the non-coated surface of the film. A method for producing base paper for stencil printing.