JPH1112497A - Surface treating agent for printed matter and printing process - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a surface treating agent which, when used to treat printed matter, can give treated printed matter which shows reduced slipperiness without detriment to its abrasion resistance, printability, etc., and does not cause accidents of slip by dispersing white or colorless microparticles and a dispersion aid therefor in a specified ratio in water. SOLUTION: 0.1-15 wt.%, desirably 0.1-10 wt.%, more desirably 0.1-5 wt.% white or colorless microparticles having a mean particle diameter of 0.1-100 μm, desirably 3-10 μm and selected among precipitated calcium carbonate, precipitated barium carbonate, barium carbonate, gypsum, clay, polypropylene, polystyrene, etc., each of which is surface-coated with a lime carbonate powder, precipitated calcium carbonate or rosin and 0-5 wt.%, desirably 3 wt.% or below dispersion aid therefor such as carboxylmethylcellulose, methylcellulose, hydroxypropylmethylcellulose or the like are dispersed in water. A process for using this comprises coating the printed matter therewith just after printing on a substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a surface treating agent for printed matter. More specifically, it is possible to prevent rubbing of printed matter in a process such as bookbinding, to prevent collapse of a load due to slippage during stacking of printed matter, an accident of dropping pages, etc., and to prevent printed matter without impairing productivity. It relates to a surface treatment agent.

[0002]

2. Description of the Related Art In recent years, in the printing industry, demands for labor-saving, labor-saving, automation, and high-speed printing have been increasing. There is a demand for printing inks that can provide high-quality printed materials, and ink manufacturers have been implementing various improvements. Above all, there is a very high degree of demand regarding the rubbing of the printed matter, and in offset sheet-fed printing, drying is required to be as fast as possible, such as when printing a post-printed surface after printing a preceding surface, and using a roller of a printing machine. Sufficient friction resistance is required to prevent scratching and to prevent rubbing during final binding. on the other hand,
Off-press printing is generally performed after printing on a printing press, from 180 to 23 prints.
A hot air of 0 ° C. or an open flame is applied to the printed matter,
After evaporating the solvent in the ink at a paper surface temperature of about ℃, the ink is rapidly cooled by a water-cooling cooling roller to solidify the ink, and then passed through a number of guide rollers, guided to a folding machine and a stacker, and packed. Therefore, rubbing of printed matter is one of the most important precautions.

[0003] In particular, rubbing with a guide roller, a turn bar, or a triangular plate during printing of a web-fed print is several times faster than sheet-fed printing. It can be said that there is. Of course, rubbing at the time of bookbinding after printing is required to have the same abrasion resistance as a sheet-fed printed matter. In recent years, the shift from sheet-fed printing has been progressing rapidly in recent years because of its high productivity, and high-quality printing is required from conventional leaflet-based printed materials to catalogs and posters. Since the demand for printed matter is changing, rubbing of printed matter is more important than ever. In addition, publishing gravure prints have a high printing speed as well as off-wheel printing, so that rubbing during printing is likely to occur,
Suitability for rubbing during bookbinding after printing is also required, and rubbing of printed matter is a very important problem because it significantly reduces the value of printed matter.

[0004] For these reasons, recent printing inks have been designed so that friction resistance is regarded as important, and improve the resistance to rubbing of printed matter on a printing machine and rubbing after printing such as during bookbinding. Therefore, fine particle wax such as polyethylene (PE) and polytetrafluoroethylene (PTFE),
In addition, a large amount of petroleum-based wax and the like have been included in inks. Such an ink using a large amount of wax, when formed into printed matter, has a large amount of wax on the surface of the ink film and imparts a slip property, thereby making it difficult to generate scratches and rubbing stains on the printed matter.

[0005] The method of preventing slippage of printed matter by imparting slip properties as described above is very effective.
On the other hand, there is also a problem caused by slipping of printed matter. For example, when printed materials are stacked and slipped, they cannot be stacked high.When transported by truck or the like, the printed products may collapse and become packed.They are packed and transported as publications such as magazines. In some cases, the slippage between the pages is too high, and the pages may slip out of the page even though the pages are bound with the staples.

In order to prevent such an accident, the amount of wax added to the ink is changed depending on the use of the ink to adjust the slip property. A wax having a low slip property is mainly used for the ink. Additives that can be suppressed have been added to the ink, etc., but all of them have the effect of suppressing the slip property, but there is a deterioration in the friction resistance, and the printability may be impaired, etc. , Abrasion resistance, slip properties and printability could not be satisfied in all aspects.

[0007]

SUMMARY OF THE INVENTION The present invention is intended to prevent the occurrence of accidents due to slippage of printed matter by maintaining the slip property of the printed matter at a low level without impairing the friction resistance and printability of the printed matter. It is assumed that.

[0008]

That is, the present invention provides an aqueous dispersion containing 0.1 to 15% by weight of white or colorless fine particles and 0 to 5% by weight of a dispersing aid for the fine particles in the total composition. A surface treatment agent for printed matter, characterized by comprising:

Further, the present invention relates to a printing method characterized in that a printed material immediately after printing on a printing medium is coated with a surface treating agent for the printed material.

[0010]

DETAILED DESCRIPTION OF THE INVENTION The microparticles of the present invention must be water-insoluble. When the fine particles are water-soluble, there is no effect of reducing or maintaining the slip property of the printed matter, and the effect is exhibited only when the water-insoluble is used. The reason is that, in order to suppress the slip property, a sufficient amount of the solid content as the slip property suppressing material must be present on the surface of the printed material, and if it is water-soluble, it is added to the paper fibers together with water. It is considered that the effect cannot be exerted due to permeation.

The size of the fine particles of the present invention is 0.1 to 100.
It is preferable that the particle size is in the range of about μm, and it is preferable that the average particle diameter is about 3 to 10 μm and that it has an appropriate particle size distribution. It is not something to be done.

The white or colorless fine particles of the present invention may be inorganic or organic. As inorganic fine particles, carbonated lime powder, precipitated calcium carbonate, precipitated calcium carbonate surface-coated with rosin, precipitated barium sulfate, barium carbonate, gypsum, clay, silica powder, diatomaceous earth,
Talc, basic magnesium carbonate, alumina white,
Satin white, slaked lime, bentonite and the like can be mentioned, and organic fine particles include latex such as polypropylene, polystyrene and styrene / butadiene rubber, butadiene rubber, isoprene rubber, chloroprene rubber and butyl rubber. The above materials may be used in combination of two or more as necessary.

The content of the fine particles in the present invention is preferably from 0.1 to 15% by weight, preferably from 0.1 to 10% by weight, more preferably from 0.1 to 5% by weight, based on the whole composition.
Is good. In particular, when the fine particles are white, the use amount is preferably 5% by weight or less. 0.1
When the amount is less than 10% by weight, the effect of suppressing the slip property of the present invention cannot be exhibited, and when the amount is more than the upper limit, the fluidity of the aqueous dispersion becomes poor, resulting in uneven coating or coating. The coated film is undesirably colored white.

The surface treating agent of the present invention may optionally contain a water-soluble dispersing aid. These dispersing aids include carboxymethylcellulose (CM
C), water-soluble polymer substances such as methylcellulose, hydroxypropylmethylcellulose and starch, long-chain alcohols such as tridecanol, polyhydric alcohols such as glycerin, alkylamine salts, polyoxyethylene alkyl ethers, sorbitan fatty acid esters and fatty acid monoglycerides. When a surfactant is present and a surfactant having an antistatic action such as an alkyl phosphate is contained, the generation of static electricity can be reduced. These dispersing aids are incorporated in the entire composition at 5% by weight or less, preferably at 3% by weight or less.

It is preferred that the surface treatment agent for a printed material according to the present invention is applied on a printed material immediately after printing. In the case of a sheet-fed printing machine, a printing machine with a coater can be conveniently applied to a printed matter by a coater, and in the case of an off-wheel printing machine, it can be applied to a printed matter by a silicon applicator after passing through a cooling roller. In addition, by providing a spraying device at an arbitrary part of the printing press, the coating composition of the present invention can be applied online in any of sheet-fed printing presses, web offset printing presses, and gravure printing presses. it can.

[0016]

The present invention will be described in more detail with reference to the following examples. In addition, all% in an example means weight%. Table 1
The surface treatment agents A to J prepared according to the formulations shown in Table 1 were prepared.

[0017]

[Table 1]

The fine particles and dispersion aids used in Table 1 are as follows. Precipitable calcium carbonate 1: Precipitable calcium carbonate surface-coated with rosin HYDROCER ER77: Polypropylene emulsion manufactured by Shamrock (29% solid content) Nippol LX432A: Styrene butadiene latex manufactured by Zeon Corporation (41% solid content) LX825: Acrylate latex (solid content 45%) manufactured by Zeon Corporation Emulgen 105: Surfactant polyoxyethylene lauryl ether manufactured by Kao Corporation Electrostripper K: Antistatic agent potassium potassium phosphate manufactured by Kao Corporation

(Printing Example 1) Using a web offset press NEO800 manufactured by Mitsubishi Heavy Industries, Ltd., 79.1 g of pearl coat manufactured by Mitsubishi Paper Mills, Inc., and WD Leo Echo each color offset web ink manufactured by Toyo Ink Mfg. Co., Ltd. The printed material obtained by printing the solid portion of four colors according to Comparative Example 1 was used as Comparative Example 1. During the printing of Comparative Example 1, the surface treatment agents A to F were applied online using a silicone applicator to obtain printed products of Examples 1 to 6.

(Printing Example 2) In Printing Example 1, a spraying device was installed at a position where the printed matter after passing through the cooling roller could be sprayed, and the surface treatment agents A to C were spray-coated on-line. Printed.

(Printing Example 3) Sheet-fed ink TK manufactured by Toyo Ink Mfg. Co., Ltd. was applied to 79.1 g of pearl coat manufactured by Mitsubishi Paper Mills Co., Ltd. A printed material in which four-color solid portions were printed with each of the high echo colors M was used as Comparative Example 2. During the printing of Comparative Example 2, the surface treatment agents G to J were applied online using a coater to obtain printed products of Examples 10 to 13.

Table 2 shows the measurement results of the friction resistance and slip angle of the obtained printed matter. The printed materials of Examples 1 to 13 according to the present invention not only have good friction resistance, but also have a slip angle several degrees higher than that of the comparative example, and the slip property is suppressed. it is obvious.

[Table 2] * Abrasion resistance is measured by Sutherland Lab Tester (paper is blank). ** Slip angle is measured with a slip angle measuring device manufactured by Toyo Seiki Co., Ltd. (printed surfaces).

The surface treatment agent for printed matter of the present invention can greatly suppress the slip property of the printed matter without causing deterioration in the quality of the printed matter due to rubbing. Accidents such as collapsing and missing pages of publications can be prevented.

Claims (2)

[Claims] 1. A printed matter comprising an aqueous dispersion containing 0.1 to 15% by weight of white or colorless fine particles and 0 to 5% by weight of a dispersing aid for the fine particles in the total composition. Surface treatment agent. 2. A printing method, characterized in that a printed matter immediately after printing on a printing medium is coated with the surface treating agent of the printed matter according to claim 1.