JPS61173992A - Thermal stencil plate original paper suitable for preparing of thermal element plate - Google Patents

Abstract

PURPOSE:To enable head travel performance, piercing property and head wear resistance to be made satisfactory by providing a layer applied with an amount within a specifically limited range of surfactant and/or external lubricant except sodium salt and potassium salt above specific temperatures of melting point on the non-adhesive surface of thermoplastic film elongated below a specific thickness and laminated film of an ink permeable support and adhesive bound together. CONSTITUTION:A layer of 0.05g/m<2> or more and 2g/m<2> or less of surfactant and/or external lubricant except sodium salt and potassium above 30 deg.C of melting point is provided on the non-adhesive surface of laminated film of 4mu or less than film and an ink permeable support bound together with adhesive. Elongated film of copolymer mainly composed of vinylidene chloride, vinyl chloride copolymer, vinyl chloride resin of high crystallinity and polypropylene or polyester resin is used. However, as thin a film as possible is preferred so that a pierced image of high piercing property and high resolution may be available. Normally the thickness is 4mu or less. Natural fiber or thin porous paper of synthetic fiber can be used as an ink permeable support.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a heat-sensitive stencil paper suitable for producing a stencil blank using a thermal head.

(Prior art) A type of thermal stencil paper that uses a thermal element to obtain a stencil plate (
Hereinafter, it will be abbreviated as the thermal element type. ) is already known, and recently there has also been proposed a method for directly producing a stencil original without image formation using a stencil printing device that integrates a thermal head and a printing machine, that is, a word processor. (For example, JP-A-53-49519; JP-A-54-8
3043, Japanese Unexamined Patent Publication No. 54-83117. Japanese Unexamined Patent Publication 1986-14
8679 publications) For example, proposed thermal element type heat-sensitive stencil sheets include: ■ Stretched thermoplastic synthetic resin film (hereinafter referred to as "film"); ■ A film provided with a thermal transfer layer;
Leilm and porous support were bonded together. (2) A film in which powder particles are fixed to a film; (2) A film and a porous support are bonded together and sodium laurate is coated on the film surface to prevent the thermal head from adhering.

In addition, the method of plate making is different, but the purpose is to create a stencil plate by placing an infrared-absorbing original and a heat-sensitive stencil paper in close contact, irradiating infrared rays from the heat-sensitive stencil paper side, and transmitting the heat generated in the image area to the stencil paper. There is a heat-sensitive stencil paper (abbreviated as infrared irradiation type). Heat-sensitive stencil paper used for this purpose mainly has a structure of porous support/adhesive/film/adhesion prevention layer, and the original and film are fused during plate making, and the film is removed when the original is removed. In order to prevent tearing, various efforts have been made to create anti-adhesion layers.

Potassium sulfonic acid, alkyl sulfate, etc., ammonium salt, potassium oleic acid sulfonic acid.

Providing sodium, ammonium salt, or room temperature curing silicone resin
-5139. Tokuko Sho+8-1581゜ Tokuko Sho 58-15
8697 publications], @ points are 40 to 1 during film formation.
A film made by adding a fatty acid, a fatty acid ester, or a fatty acid amide to a resin at 50℃ is used
8-1009), coloring the M adhesion prevention layer, support and/or adhesive (Japanese Patent Publication No. 54-88178; Japanese Patent Publication No. 1983-1989-
2895 publications).

Furthermore, infrared ray irradiation type thermal stencil paper has various problems and cannot be satisfactorily used as a thermal stencil paper for producing a stencil blank using a thermal element.

In other words, the anti-fusing agent layer provided on the film with sodium stearate, potassium salt of alkyl sulfonic acid/alkyl sulfate, potassium/sodium salt of oleic acid amide sulfonic acid, etc. has the disadvantage that it significantly accelerates head wear. There is. In addition, ammonium salts of alkyl sulfonic acids and alkyl sulfates are usually oily, and even if they are coated on a film, they migrate to the back side when handled in roll or sheet form. Even if it can be used as a stencil paper for thermal heads, it has the problem of unstable head running properties. Even when the particles are fixed, the head running performance is still unsatisfactory. Similarly, fatty acids alone during film formation.

A film formed by adding fatty acid esterified fatty acid amide to a resin also fails to satisfy head running properties.

(Problems to be Solved by the Invention) By the way, in order to create a satisfactory stencil plate using a thermal element, especially a thermal head, 1) the stencil paper should not be fused to the thermal head during plate making and the stencil paper should run over the thermal head; (hereinafter referred to as "head runnability") 11) Good perforation (hereinafter referred to as "perforability") 110 Ability to use the head for a long period of time to prevent shortening of the life of an expensive head (hereinafter referred to as "head wear") ) etc. are required at least.

However, conventionally known thermal element type thermal stencil paper and infrared ray irradiation type thermal stencil paper are insufficient to meet these demands.

That is, when a thermal element, such as a thermal head, is brought into direct contact with the stretched film, the heat-sensitive stencil paper can be used as a single film or with a thermal transfer layer provided on the back side of the film;
Alternatively, in the case of bonding a film and a porous support, there is a serious problem that the film is thermally fused to the thermal head during plate making, making it impossible to obtain a satisfactory stencil plate due to unsatisfactory head running. I have a problem.

On the other hand, although the head running performance of a film with powder particles fixed to the film surface is slightly better than that of a film alone, it is still not sufficient, and there are problems such as the film being torn during plate making and the head running performance being insufficient. Was. or,
A method in which a film and porous thin paper are bonded together and sodium laurate is applied to the film surface has good head running performance, but has the problem of severe head wear.

is often not carried out satisfactorily. For example, a film with a room-temperature curing silicone resin may allow the head to travel, but only a few holes are formed and only poor print images are obtained.The reason for this is unclear, but it is difficult to use a thermal head. This is probably because the perforation corresponding to one dot needs to be done in an extremely short time of several milliseconds or less, and less thermal energy is applied to the film than in the infrared irradiation method. Therefore, when it comes to stencil printing using a thermal head, consideration must be given to making the stencil paper perforated with lower energy than conventional infrared irradiation type heat-sensitive stencil paper.

As mentioned above, none of the thermal element type heat-sensitive stencil papers that have been proposed so far has satisfied all of the essential properties of the heat-sensitive stencil paper for this purpose, such as head running properties, perforation properties, and head abrasion. Further, infrared ray irradiation type thermal stencil paper also cannot satisfy the head running properties, perforation properties, head abrasion, etc. required for thermal element plate making.

(Means and effects for solving the problems) The present inventors have investigated various aspects of thermal stencil paper that solves the above problems and satisfies all aspects of head running performance, perforation performance, and head abrasion in thermal heads. As a result, a surfactant (with a melting point of 30°C or higher) excluding um salts and potassium salts was added to the non-adhesive surface of the laminate in which a film of 4μ or less and an ink-permeable support were bonded together with an adhesive. It was discovered that by providing an external lubricant of 0.0557 to 2 C, it is possible to obtain a heat-sensitive stencil paper that satisfies all aspects of head running properties, perforation properties, and head wear. 2. This led to the completion of the present invention. It is.

The film used here is a stretched film made of vinylidene chloride/vinyl chloride copolymer, vinyl chloride resin with a high degree of crystallinity, copolymer mainly composed of propylene, polyester resin, etc. In order to obtain good perforation performance and high-resolution perforation images, it is better to use a film as thin as possible2.It is usually 4μ or less, preferably 8μ or less.A film with a thickness exceeding 4μ can be expected to have good perforation performance with a thermal head. do not have. Currently, polyester film is most suitable for such ultra-thin films due to their availability.□ In the present invention, in order to use such ultra-thin films, it is easy to handle them.

Porous tissue paper or a mesh-like sheet made of synthetic fibers, in which an ink-permeable support is laminated on a film, can be suitably used.

In addition, acrylic resin-based, vinyl acetate-based (ethylene/
(including vinyl acetate type), polyester resin type or nylon acetate type)
7 Resin-based adhesives etc. are preferred aK1 may be used. Also, i: The surfactant used in the invention has a melting point of 3.
0°C or higher, excluding sodium and potassium salts, such as polyoxyethylene stearyl ether, sorbitan monostearate, sorbitan distearate, sorbitan tristearate, nrubitan monobalmitate, polyoxyethylene Sorbitan monostearate.

Polyoxyethylene sorbitane distearate.

Polyoxyethylene sorbitan tristearate.

Polyethylene glycol monostearate, polyethylene glycol distearate, polyoxyethylene stearate, stearic acid monoglyceride, glycerol monostearate, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene oleyl ether, holoxyethylene nonylphenol ether , nonionic surfactants such as castor oil oxidized ethylene adducts, laurylamine acetate.

Stearyltrimethylammonylum cumylide.

Cationic surfactants such as stearylbenzyldimethylanthonium chloride can be used. External lubricants suitable for use in the present invention include those having a melting point of 30° C. or higher and excluding sodium and potassium salts, such as various waxes and fatty acids.

Those used as external lubricants in resin processing, such as various fatty acid amides, fatty acid esters, fatty acid metal salts other than potassium and sodium salts, fatty alcohols, and composite systems thereof, are preferably used.

The reason for using a substance with a melting point of 30°C or higher, preferably 40"C or higher, is because substances with a melting point of 30"C or lower are sticky under normal conditions and pose problems in handling, and the product cannot be rolled. Or, even if it is made into a sheet, if a mount is interposed between the porous tissue paper that is in contact with the back side or the polymer of the film and the porous thin paper, the surfactant and/or external lubricant will be absorbed by the mount and the head will run. Unable to fully satisfy sexuality.

These surfactants and external lubricants may be used in combination. However, these surfactants and external lubricants must be provided on the film in a range of 0.05 to 2 C. If it is less than 0.05 c, the head running performance of the thermal head cannot be satisfied, and zf/W?
If 'jl exceeds 1000, the problem arises that although the head running performance may be satisfied, satisfactory perforation performance cannot be obtained.

Furthermore, a binder or a pigment with a melting point of 250°C or more and a particle size of 5μ or less may be mixed with these surfactants and/or external lubricants within a range that does not impede the perforation property.□The amount of these substances to be used is The amount is 100 parts by weight or less, more preferably 50 parts by weight or less, based on 100 parts by weight of the surfactant or/and external lubricant.

The surfactant and external lubricant may be provided on the film by any known method such as bar code coating, oil coating, air knife coating, etc. However, the present invention is not limited to this example.〇Example 1 8μ polyester biaxially stretched film (diafoil)
Co., Ltd.) and a vinyl acetate emulsion adhesive (Chuo Rika Kogyo Co., Ltd. "Ricabond p8-2000") after drying.
．． Apply it with a roll coater so that it becomes 7 sheets and immediately coat it with 12 sheets.
A polymer consisting of porous thin paper (Nihon Shigyo Co., Ltd. "Stencil Paper") and a laminated film/adhesive/ink-permeable support was prepared. A solution or dispersion of the substances listed in the Substances Used column in Table 1 was applied onto the polymer film using a wire bar so as to give a coating thickness of approximately 0°5 after drying, thereby preparing a heat-sensitive stencil paper according to the present invention. The base paper obtained in this way was printed using a long-distance printing device (equipped with a 6-dot/- thermal head) manufactured by Matsushita Electric Central Research Institute, and then printed using a stencil printing machine (froneo manufactured by Gakken Co., Ltd.). 970J'l printing and examining the head running performance and print image quality - Kuchimata, experiment Nil
For experiment N18, a checkered pattern was printed continuously for a length of 2000 m, and the wear of the thermal head before and after one printing was measured using a surface roughness meter [Surfcom 300B type manufactured by M-Kyo Seimitsu Co., Ltd.] to determine the thickness. are shown in Table 1.

[Margin below]

As described above, the stencil paper of the present invention exhibits good perforation with a thermal head, has good head running performance in practical use, and has extremely little head wear.

Furthermore, 20 pieces of the above 14 ft of stencil paper were placed in each 8 inch paper tube.
After 8 months, I tried making plates using a thermal head in the same way with a 0m roll and a sheet cut into 100 sheets and packaged, but the head runnability was poor.

There was no change in perforability from when it was first created.

Example 2 The film surface of the polymer prepared in Example 1 was coated with partially saponified esters of sorbitan monostearate, stearic acid, and montanic acid in varying amounts to prepare heat-sensitive stencil paper. These were plate-made and printed in the same manner as in Example 1, and the head running properties and perforation properties (printed images) were examined. As a result, Table 2 shows that there is a problem with the head running properties when the coating amount is less than 0.05 Vd. On the other hand, it was found that when the diameter exceeds 2.0 sea, it becomes difficult to drill holes.

[Lunar margin]

Table 2 head running performance The X mark sticks to the head and does not run satisfactorily.

The mark Δ indicates that it is a little difficult to run, but if the stencil sheet is pulled lightly at the feeding part, it will run well.

The mark ○ indicates good running performance.

A mark of 1 for perforability indicates that the head cannot run, so a plate cannot be obtained and the perforation cannot be evaluated.

◎, ○, Δ, and X marks indicate that the dot reproducibility in the peta printing section is 93% or more, 98 to 85 inches, 85 to 75 inches, respectively.
75 to 50, indicating less than 50%.

Example 8 One portion each of partially saponified esters of sorbitan monostearate and montanic acid was applied to the film surface of the polymer of Example 1.
The heavy background part was mixed with 6 parts by weight of methyl alcohol, dispersed with an attritor, and applied to a 0°4 seam.

Plate printing was carried out in the same manner as in Example 1, and both head running properties and printed images were good.

Practical Work: Polyoxyethylene stearyl ether was coated on the film of the polymer to a thickness of 0.5 sheets, and plate printing was carried out in the same manner as in Example 1.

The head running performance was good in all cases, but in the printed image, it was difficult to see discontinuities between dots in the case of using a 2μ polyester film, and a uniform petaprint image and an unbroken character image were obtained, which was extremely good. I was able to get some printed matter. On the other hand, when a 6μ polyester film was used, there were almost no perforations and the printed image density was low, making it difficult to read the characters on printed matter. Although the printed image density was relatively high, the reproducibility of dots was extremely poor and only inferior printed matter was obtained.

Example 5 The following composition was applied on the film of the polymer of Example 1 at a concentration of 0.4~
o, 5t7ttz was coated and plate printing was carried out in the same manner as in Example 1.

Composition 1 A coating liquid mixed with

A coating liquid prepared by mixing 10 parts by weight of Composition 2 liquid.

Composition 8 A coating liquid mixed with

As a result, all examples showed good head running performance and perforation performance.

Comparative Example 1 Polyoxyethylene alkyl ether ammonium sulfate f!, which is liquid at room temperature, was applied to the film surface of the polymer prepared in Example 1. :0.5 seam coated and plate-made and printed in the same manner as in Example 1. Immediately after preparation, head running performance.

Both the printed images were good, but the roll and sheet forms were rated 6.
The printhead that had been stored for several months could not be satisfactorily made because the head could not run in some parts.

Comparative Example 2 Sodium dodecylbenzenesulfonate (Neopex F-25J, manufactured by Kao Soap Co., Ltd.) and potassium oleate soap (manufactured by Kao Soap Co., Ltd. [FR- 14J) was coated at a thickness of 0°5 seam, a checkered pattern was printed continuously for 2000 m in the same manner as in Example 1, and the wear of the thermal head before and after printing was examined.
It is 5μ.

It was found that compared to the stencil paper of the present invention, the head wear was extremely large. Although it was not possible to satisfy the requirements for head running performance, perforation performance, and head abrasion, it was found that a film with a thickness of 4μ or less and an ink-permeable support were bonded together with an adhesive, and a melting point was observed on the film surface of the carcass. Q, 05 t/rr?
By providing 2.0 caps or less, Examples 1 to 5. As shown in Comparative Examples 1 and 2, it was possible to obtain a heat-sensitive stencil paper suitable for PA element plate making with good head running properties, perforation properties, head wear, and changes over time.

Claims (1)

[Claims] A surfactant other than sodium salts and potassium salts with a melting point of 30° C. or higher and a surfactant with a melting point of 30° C. or higher and /or 0.05g/external lubricant
A heat-sensitive stencil paper characterized by having a layer having a density of m^2 or more and 2.0 g/m^2 or less.