JPH04238095A - Method for producing base paper for thermal stencil printing and base paper for thermal stencil printing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 stencil printing paper by thermal perforation using a thermal head, and to a stencil printing paper produced by the method.

0002

BACKGROUND OF THE INVENTION Heat-sensitive stencil printing base paper has been used in which a heat-shrinkable plastic film that is easily perforated by heating and an ink-permeable base material are laminated and bonded together. This base paper is heated and perforated by a thermal head of a plate making machine to create an image, and a plate used for stencil printing is made. In this case, the film tends to stick due to the heat of the thermal head, and when it sticks to the thermal head surface and the thermal head and film move relative to each other, the shape of the hole may change or the film may be partially torn. There is a drawback that the image quality is deteriorated due to the peeling or peeling. For this reason, various efforts have been made to prevent fusion of film surfaces. For example, JP-A-58-153697, JP-A-61-40196, JP-A-58-925.
No. 95, JP-A-60-97891, JP-A-Sho 6
Japanese Patent No. 1-182982 and the like disclose methods of applying various lubricants and anti-fusing agents to the surface of a plastic film that will come into contact with a thermal head. However, all of these methods involve forming an anti-adhesive substance on the surface of the film in contact with the thermal head, so they require an extra coating process and are complicated, such as kneading during film formation. The disadvantage was that it required a long process.

[0003] Furthermore, in the method of applying an anti-fusing agent to the surface of the film, when the stencil paper is wound up into a roll, the anti-fusing agent on the film migrates into the base material or into the film, and over time. Therefore, the ability to prevent fusion may decrease. Furthermore, in JP-A-2-55196, in a heat-perforated stencil paper in which an ink-permeable base material and a heat-shrinkable plastic film are laminated and bonded, the base material contains silicone, and then the base material and the film are bonded or an adhesive is used. A method of bonding with an adhesive containing silicone is disclosed. This method has the disadvantage that adhesive strength is weak, and the base material and film peel off during printing, resulting in poor printing durability.

0004

SUMMARY OF THE INVENTION The first object of the present invention is to
282983, 63-53097, 63-173637
, 63-173694, 64-14092, 64-18
It is an object of the present invention to provide a method for efficiently producing heat-sensitive stencil paper using a peelable laminated film described in US Pat. No. 689, etc. The second object is to provide a heat-sensitive stencil paper whose ability to prevent fusion is not reduced over time. The third purpose is to appropriately control the antistatic properties of the base material and the permeability of ink.
It is an object of the present invention to provide a heat-sensitive stencil paper having good transportability and high image quality.

[0005]

[Means for Solving the Problems] The present invention is a method for producing base paper for heat-sensitive stencil printing in which an ink-permeable porous substrate and a plastic film are laminated and bonded. A method for producing stencil paper and a stencil paper for thermal stencil printing, characterized in that a liquid containing an anti-stick agent is applied to the body surface to impregnate it. The film used in the present invention can be a conventionally used single-layer film or the above-mentioned easily peelable laminated film, but the use of an easily peelable laminated film is particularly effective. The porous substrate used in the present invention can be any of natural fibers such as Manila hemp, synthetic fibers such as polyethylene terephthalate, vinylon, rayon, etc., or conventionally used substrates made of a mixture thereof. The substrate may be course-processed or resin-processed.

[0006] The adhesive used in the present invention is
It is a resin with a relatively low softening temperature that does not inhibit perforation as described in 47997, such as polyvinyl acetate, vinyl acetate copolymer, polyacrylic acid ester, vinyl chloride, SBR, NBR, epoxy, etc. A resin or rubber solution or emulsion is used. Also, JP-A-61-
116595, the chlorinated polypropylene resin disclosed in JP-A No. 62-1589, and various other conventionally known resins can be used. In the present invention, in addition to methyl silicone oil, alcohol, amino,
Modified silicone oil such as polyether, higher fatty acid, epoxycarboxylic acid, mercapto, etc., JP-A-58-153
697, 61-295098, silicone varnish such as room temperature curing, ultraviolet curing silicone resin,
JP 61-102294, 61-102295, 61
-114893, 61-114894, etc. Phosphate ester type surfactants, JP-A-60-0195
Conventionally known anti-fusing agents can be used for the fluororesin, fluorosurfactant, etc. disclosed in No. 91. A cationic, nonionic, or anionic antistatic agent may be added to the anti-fusing agent used in the present invention, if necessary. Furthermore, a surfactant may be added to reduce the amount of trial printing as described in JP-A-59-16794.

[0007]

[Examples] The present invention will be specifically explained below with reference to Examples. Note that the amounts (parts) of each component described in the examples are parts by weight. Example 1 A heat-shrinkable plastic film was produced by further biaxially stretching a laminated film consisting of a carrier film and a heat-sensitive film on both sides by inflation co-extrusion molding. Polyester thermosensitive film (M/A/
An easily peelable three-layer film having the following properties (denoted as M) was used. First step: A 18% solution of vinyl chloride-vinyl acetate copolymer resin is used on the surface of one of the heat-sensitive films of the three-layer film, and the dry adhesion amount is 1.5 g.
/m2, laminated with 10 g/m2 Manila hemp tissue paper, and dried at 30°C. Second step: In exactly the same manner as the first step, thin paper is attached to the other heat-sensitive film surface, and then 0.25 parts of alcohol-modified silicone oil and 0.20 parts of a cationic antistatic agent are applied to the substrate surface that was attached in the first step. 0.45% of anti-fusing liquid consisting of
The liquid was applied and impregnated using a smoothing bar, and dried at 40°C. Third Step The anti-fusing agent was coated and impregnated on the substrate surface on which the anti-fusing agent was not applied in the second step in exactly the same manner as in the second step, and dried at 40°C. Fourth step: Using a slitter equipped with a peeling mechanism, slitting was performed while peeling and removing the carrier film to obtain a roll of heat-sensitive stencil paper.

[0008] This base paper was processed using Preport SS950,
Energy applied to the thermal head: 0.075mJ/d
Plate printing was performed using an ot and evaluated. Each evaluation item is as follows. One week after finishing the stickable slit, and after storing it for two weeks at 50°C, it was made into a plate, and if there was no peeling between the film and the substrate, it was rated as ○.
Those in which peeling between the film and the substrate were observed were rated x. Printing durability: Printing was performed in a room at 30° C. and 80%, and the number of prints was expressed as the number of sheets printed until an abnormality was observed in the image. Surface air resistance It was expressed as the surface specific resistance when the film surface and substrate surface were conditioned for 12 hours or more at 20° C. and 65% RH after 1 week of slit storage and 2 weeks of storage at 50° C. Printed matter printed in a room with ink permeability of 65% at 20°C: ○ where ink permeability is not obstructed at all, △ where some white spots are present, △ where there are many white spots × The above evaluation results are shown in Table 1. .

Comparative Example 1 First Step A substrate was bonded to the heat-sensitive film surface of a three-layer film in exactly the same manner as the first step of Example 1. Second step: The substrate was bonded to the other side in exactly the same manner as the first step. Third step Only the carrier film was peeled off using the slitter used in the fourth step of Example 1. Fourth Step The anti-fusing liquid used in the third step of Example 1 was applied to the film surface using a smoothing bar, and dried at 40°C. Fifth Step In exactly the same manner as in the fourth step, an anti-fusing liquid was applied to the other film surface. Sixth Step: The raw fabric produced in the fourth step was slit to obtain a rolled base paper for heat-sensitive stencil printing. Seventh Step The raw fabric produced in the fifth step was slit to obtain a rolled base paper for heat-sensitive stencil printing. The evaluation results are shown in Table 1.

0010

[0011] From the above results, when using the existing laminator, the present invention requires 4 steps, whereas Comparative Example 1, which is the prior art, requires 7 steps, and the present invention has an efficient manufacturing method. It can be said that it is a method. Furthermore, regarding the sticking property when stored at 50° C. for 3 weeks, the product of the present invention had no problems at all, whereas in Comparative Example 1, sticking occurred and the film peeled off. Example 2 Instead of the alcohol-modified silicone oil of Example 1,
A roll of heat-sensitive stencil paper was obtained in exactly the same manner as in Example 1 except that amino-modified silicone oil was used. This heat-sensitive stencil paper was evaluated in the same manner as in Example 1, and the results are shown in Table 2.

Comparative Example 2 First Step Using the same three-layer film as in Example 1, the same amino-modified silicone oil-containing adhesive as in Example 2 having the following formulation was applied to one surface of the heat-sensitive film in a dry amount. 1.5g/m
2, laminated with 10 g/m2 Manila hemp tissue paper, and dried at 30°C. Adhesive layer formulation: Vinyl chloride/vinyl acetate copolymer (35% solution) 44.23 parts Amino-modified silicone oil 0.
72 parts cationic antistatic agent
1.8 parts toluene Second step A thin paper was attached to the other side of the three-layer film in exactly the same manner as the first step. Third Step In exactly the same manner as the fourth step of Example 1, slitting was performed while peeling off the carrier film to obtain a roll of heat-sensitive stencil paper. The evaluation results are shown in Table 2. Comparative Example 3 A roll of heat-sensitive stencil paper was obtained in the same manner as in Comparative Example 2, except that an adhesive containing amino-modified silicone oil was applied to the thin paper side and laminated. The evaluation results are shown in Table 2.

[0013]

From the above results, Comparative Examples 2 and 3 can be manufactured in 3 steps and are efficient, but Comparative Example 2 has a high surface resistance on the film surface with a low printing durability and poor conveyance due to static electricity. There were also disadvantages such as sticking. Furthermore, Comparative Example 3 has a drawback that the ink permeability of the substrate is poor and white spots occur on the printed matter, which has a low number of prints. Examples 3 and 4 In Example 1, Manila hemp tissue paper was made of 0.4 denier P.
A roll of heat-sensitive stencil paper was obtained in exactly the same manner as in Example 1, except that 8 g/m2 thin paper made of ET fiber was used and the anti-stick liquid was changed to the following formulation. Stick prevention liquid
Example 3
Example 4 Alkyl-modified silicone oil 0.2 part
0.2 parts Glycerin ester activator

0.3 parts (product name DT-100 manufactured by Teijin Ltd. 50
% aqueous dispersion) Cationic antistatic agent (solid content 35%)
0.43 parts 0.43
Department IPA
50.0 copies
50.0 parts toluene

50.0 copies 50.0 copies

In Example 3, no sticking occurred even after 3 weeks at 50°C, but traces of the PET fiber grains became slightly white in the printed area of the solid area. In addition, the image on the first printed sheet was a little blurred, but in Example 4, there was no sticking fiber grain, and a printed material that was better than the first printed sheet was obtained. In the present invention, an anti-fusing agent and an antistatic agent are coated and impregnated on the back surface of the substrate, not on the film surface that directly contacts the thermal head, but the anti-fusing agent and antistatic agent contained in the substrate are It is thought that while the film is being wound up and stored, it migrates to the side of the film that is in direct contact with the substrate, and exhibits the effect of preventing adhesion to the thermal head and preventing static electricity on the film surface.

[0016]

[Effect of the invention] When applying anti-adhesion processing to the film surface using the conventional method, first the laminated film and the substrate are bonded together, then the carrier film in the laminated film is peeled off, and then an anti-adhesion agent is applied to the film surface. Therefore, existing equipment could not be used and a stripping device was required. In the present invention, the laminated film and the substrate are bonded together, and the anti-fusing agent is immediately coated and impregnated on the substrate side, so existing equipment can be used, which is economical and efficient. In addition, since the base material is coated and impregnated with an anti-fusing agent, when the film is wound into a roll, the anti-fusing ability will not deteriorate over time, and it will not deteriorate when it is conventionally applied to the film surface. In some cases, even those that could not be used due to deterioration over time can be used in the present invention. In addition, in the present invention, antistatic agents, wetting agents, etc. can be used in combination, so there is no need to prevent poor conveyance of the stencil paper due to charging, and there is no need for trial printing.

Claims (2)

[Claims] Claim 1: In a method for producing a base paper for heat-sensitive stencil printing in which an ink-permeable porous substrate and a heat-shrinkable plastic film are laminated and bonded, after the porous substrate and the plastic film are laminated and bonded, a stick prevention method is applied to the surface of the porous substrate. 1. A method for producing base paper for heat-sensitive stencil printing, which comprises applying and impregnating a liquid containing an agent. 2. A base paper for thermal stencil printing produced by the method of claim 1.