JPH10287060A - Web coater liquid for offset printer, manufacture of printed matter using it, and the matter coated therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give suitable slipperiness by giving sufficient rub resistance onto a print sheet surface, and preventing flaw on a surface of printed matter. SOLUTION: The web coater liquid comprises aqueous dispersion liquid containing 0.1 to 3.0 wt.% of polyolefin wax in such a manner that total non volatile component in the liquid is 0.2 to 10.0 wt.%. A ratio of the wax occupying total nonvolatile component is 5 to 100 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a web coater liquid which is applied to a paper surface after printing by an offset printing machine to prevent the printed matter from being stained when the paper is conveyed and to improve workability in bookbinding. In addition, the present invention relates to a method for manufacturing a printed matter in which a web coater liquid is applied by a coating device after a drying step in offset printing. Furthermore, the present invention relates to a printed matter coated with a web coater liquid.

[0002]

2. Description of the Related Art Conventionally, in web offset printing, a web coater solution composed of a silicone emulsion or an antistatic agent is applied thinly on a paper surface using a web coater, and the roll is guided by a guide roller, a tension roller or a cutting machine. This prevents the printed material surface from being scratched by friction with mechanical parts such as a folding machine.

[0003] However, in the case of a silicone emulsion-based or antistatic agent-based web coater liquid which has been conventionally used, if sufficient friction resistance is imparted, the slipperiness becomes too high, so that the printing speed cannot be increased or cutting is performed. There was an inconvenience that the balance would occur on the machine or folding machine. In addition, if the paper is slipped too much, there is a problem that the paper is rubbed and stained by the stacker bundler after the paper is discharged, and the load is displaced when the paper is stacked. Further, the silicone emulsion has a problem that the platinum catalyst for combustion of the deodorizing combustion device attached to the offset printing machine is poisoned, the catalytic activity is deteriorated, and maintenance is required.

[0004] For this reason, the yield of the final printed matter is deteriorated, and the activity of the platinum catalyst must be restored by chemical cleaning, which is one of the causes for increasing the total printing cost.

On the other hand, in sheet-fed printing, an overprint varnish having high smoothness is applied after printing, or an overcoating composition is applied to a printing surface in a wet state immediately after offset printing using oil-based ink. That is being done. The purpose of such a coating agent is mainly to obtain a glossy high-quality printed matter and to prevent set-off and blocking. In high-speed web offset printing, these coating agents cannot be applied as web coater liquids for preventing scratches on the printed surface.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to impart a sufficient rub resistance to a printing paper surface so that the surface of a printed matter is not damaged. An object of the present invention is to provide a web coater liquid capable of efficiently performing bookbinding work without lowering the speed by imparting an appropriate slip property to prevent the occurrence of the bookbinding. Furthermore, there is no poisoning of the platinum catalyst of the deodorizing combustion device,
An object of the present invention is to provide a web coater liquid capable of reducing the cost of a final printed matter.

Further, it is possible to prevent the surface of the printed matter from being damaged,
It is an object of the present invention to provide a method for manufacturing a printed material that can efficiently perform a bookbinding operation.

Another object of the present invention is to provide a printed material in which the surface of the printed material is prevented from being damaged and the cost is reduced by efficiently performing bookbinding.

[0009]

In order to achieve this object, a web coater liquid for an offset printing press according to the present invention comprises an aqueous dispersion containing 0.1 to 3.0% by weight of a polyolefin wax, The total non-volatile content in the aqueous dispersion is 0.2 to 10.0% by weight, and the ratio of the polyolefin wax to the total non-volatile content is 5 to 100% by weight. More preferably, the viscosity of the aqueous dispersion at 25 ° C. is 5 mPa ·
s or less, and the glass transition point is −40 ° C. to 50 ° C.
Characterized by containing a water-soluble resin and / or a resin emulsion in the range of

Further, the present invention provides a method of printing by an offset printing machine to obtain a printed matter, wherein the step of applying the web coater liquid of the present invention using a coating apparatus is performed after the drying step. Provided is a printed matter, which is coated with the web coater liquid of the invention. Preferably, the slip angle between the printed surfaces of the printed matter obtained according to the invention is in the range from 10 degrees to 30 degrees.

Hereinafter, the web coater liquid according to the present invention will be described in detail. Examples of the polyolefin wax which can be used in the present invention include polyethylene wax, polyethylene oxide wax, polypropylene wax, carnauba wax, montan wax, microcrystalline wax, and caster wax. Emulsify or
Emulsions using surfactants can be used. Among them, oxidized polyethylene wax can be preferably used.

The particle diameter of the polyolefin wax can be used without any particular limitation as long as it is within the range in which production is possible. However, when a polyolefin wax having a large particle diameter is used, the abrasion resistance performance is good, but the gloss of the printed matter is high. And the coating aptitude is reduced, making normal coating difficult. For this reason, the particle diameter of the polyolefin wax is desirably 1000 nm or less. On the other hand, if the amount of the polyolefin wax in the aqueous dispersion is less than 0.1% by weight, sufficient rub resistance cannot be imparted to the printed matter, and abrasion occurs. Slipperiness becomes too high, and there is a problem at the time of cutting or folding the roll paper, or there is a problem in the subsequent bookbinding.

The viscosity of the aqueous dispersion depends on the coating apparatus, but if the viscosity at 25 ° C. exceeds 5 mPa · s, the coating suitability is disadvantageously impaired. Here, the viscosity refers to a cone plate type EL viscometer, a liquid temperature of 25 ° C. and a rotation speed of 10
It refers to the value measured at 0 rpm.

In one preferred embodiment of the present invention, a water-soluble resin and / or a resin emulsion having a glass transition point of -40 ° C. to 50 ° C. is contained in order to achieve both abrasion resistance and moderate slippage. Is preferred. If the glass transition point is lower than −40 ° C., blocking occurs, and the rub resistance is also lowered. On the other hand, if the temperature is higher than 50 ° C., there is a problem that the material slips too much. Examples of the water-soluble resin include acrylic acid-based, styrene-acrylic acid copolymer-based, maleic acid-based, and urethane-based resins, and examples of the resin emulsion include an acrylic emulsion. Further, a water-soluble resin such as carbomethoxycellulose and polyvinyl alcohol, and a natural resin such as shellac and casein can also be used.
These water-soluble resins and / or resin emulsions can be used in the range of 0% by weight to 95% by weight based on the nonvolatile content of the aqueous dispersion.

Further, according to the present invention, the slip angle between the printed surfaces of the printed matter is 10 degrees or more using the above-mentioned web coater liquid.
Provided is a method for producing a printed matter at 30 degrees, and a printed matter produced by the method. If the slip angle is less than 10 degrees, misregistration occurs when cutting printed matter,
It is inconvenient to be separated during bookbinding. On the other hand, when the angle is larger than 30 degrees, the surface of the printed matter is easily scratched, which leads to a deterioration in quality, and makes it difficult to align the paper, thereby reducing workability in bookbinding.

The O / W type polyolefin wax emulsion used in the present invention is prepared by pre-emulsifying a polyolefin wax in an autoclave under heat and pressure in the presence of a surfactant, and further through a high-pressure emulsifier. Can be.

Further, a commercially available O / W type polyolefin wax emulsion can also be used.

A surfactant, an antifoaming agent, a fungicide, a lower alcohol, a polyhydric alcohol, etc., as necessary, may be added to the web coater liquid of the present invention as far as the properties are not impaired. Can be.

[0019]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. In the examples, parts and% represent parts by weight and% by weight, respectively.

[Production Example 1] Oxidized polyethylene A-C33
0 (melting point 137 ° C., density 0.99 g / cc, acid value 30 m
gKOH / g, manufactured by Allied Signal)
3 parts of OH and 213.6 parts of water were added, premixed, heated to 150 ° C. in an autoclave, and then a nonionic surfactant NP-7.5 (manufactured by Nikko Chemicals Co., Ltd.)
12 parts were added and pre-emulsification was performed. Then, using a piston type high-pressure emulsifier, the mixture was passed under a pressure of 280 kg / cm ² and rapidly cooled to 40 ° C. or lower to obtain a wax emulsion A having a pH of 7.2 and a solid concentration of 35%.

[Production Example 2] Oxidized polypropylene Epol
eneE-43 (melting point: 157 ° C, density: 0.93 g / c
c, acid value 47 mg KOH / g, 100 parts of Eastman Chemical Co.), 5 parts of triethylamine and 210 parts of water were added and premixed, heated to 170 ° C. in an autoclave, and then amine salt of oleic acid 25% containing 25% of the active ingredient was added. Was added to perform preliminary emulsification. Then, after passing through a piston-type high-pressure emulsifier under a pressure of 300 kg / cm ² , 40
The mixture was rapidly cooled to a temperature of not more than ℃ to obtain a wax emulsion B having a pH of 8.6. The solids concentration of this wax emulsion is 3
It was 0%.

[Production Example 3] Carnauba wax no. 1F
100 parts of PY flakes (manufactured by Nissin Chemical Co., Ltd.) at 95 ° C
After melting with TK Auto Homomixer HV-M type (manufactured by Tokushu Kika Kogyo Co., Ltd.) at 4000 rpm with stirring.
Parts of diethylethanolamine and 398.4 parts of water were gradually added to carry out emulsification to obtain a wax emulsion C having a solid content of 20%.

Example 1 While stirring 979 parts of water with a dissolver, 1 part of a nonionic antifoaming agent was added.
Under stirring, 20 parts of wax emulsion A is gradually added. After the end of the addition, stirring is continued for a further 5 minutes. This was filtered through a 100-mesh wire net to obtain a web coater liquid 1.

Example 2 While stirring 976 parts of water with a dissolver, 1 part of a nonionic antifoaming agent was added.
Under stirring, 23 parts of wax emulsion B is gradually added. After the end of the addition, stirring is continued for a further 5 minutes. This was filtered through a 100-mesh wire net to obtain a web coater liquid 2.

Example 3 While stirring 964 parts of water with a dissolver, 1 part of a nonionic antifoaming agent was added.
Under stirring, 35 parts of wax emulsion C is gradually added. After the end of the addition, stirring is continued for a further 5 minutes. This was filtered through a 100-mesh wire net to obtain a web coater liquid 3.

Example 4 While stirring 990 parts of water with a dissolver, 1 part of a nonionic antifoaming agent was added.
Subsequently, 9 parts of wax emulsion A is gradually added under stirring. After the end of the addition, stirring is continued for a further 5 minutes.
This was filtered through a 100-mesh wire net to obtain a web coater liquid 4.

Example 5 While stirring 925 parts of water with a dissolver, 1 part of a nonionic defoamer was added.
With continued stirring, 74 parts of wax emulsion A are gradually added. After the end of the addition, stirring is continued for a further 5 minutes. This was filtered through a 100-mesh wire net to obtain a web coater liquid 5.

Example 6 1 part of a silicone antifoaming agent was added to 907 parts of water while stirring with a dissolver. The wax emulsion A26 was continuously stirred.
Part and John Krill 74J (acrylic resin emulsion,
66 parts of solid content concentration 35%, glass transition point 22 ° C.) are gradually added. After the end of the addition, stirring is continued for a further 5 minutes. This was filtered through a 100-mesh wire net to obtain a web coater liquid 6.

Example 7 One part of a silicone antifoaming agent was added to 844 parts of water while stirring with a dissolver. The wax emulsion A26 was continuously stirred.
Part and John Krill 74J (acrylic resin emulsion,
129 parts (solids concentration 35%, glass transition point 22 ° C.) are gradually added. After the addition is complete, stirring is continued for a further 5 minutes.
This was filtered through a 100-mesh wire net to obtain a web coater liquid 7.

Example 8 One part of a silicone antifoaming agent was added to 756 parts of water while stirring with a dissolver. The wax emulsion A14 was continuously stirred.
Part and John Krill 74J (acrylic resin emulsion,
229 parts of solid content concentration 35%, glass transition point 22 ° C.) are gradually added. After the end of the addition, stirring is continued for a further 5 minutes.
This was filtered through a 100-mesh wire net to obtain a web coater liquid 8.

Comparative Example 1 While stirring 696 parts of water with a dissolver, 1 part of a nonionic antifoaming agent was added.
With continued stirring, 203 parts of wax emulsion A are gradually added. After the end of the addition, stirring is continued for a further 5 minutes. This was filtered through a 100-mesh wire net to obtain a web coater liquid 9.

[Comparative Example 2] While stirring 997.5 parts of water with a dissolver, 1 part of a nonionic antifoaming agent was added. The wax emulsion A1.
Add 5 parts gradually. After the end of the addition, stirring is continued for a further 5 minutes. This was filtered through a 100-mesh wire net to obtain a web coater liquid 10.

Comparative Example 3 One part of a silicone-based antifoaming agent was added to 564 parts of water while stirring with a dissolver. Under stirring, 6 parts of wax emulsion A and 429 parts of Joncryl 74J are gradually added. After the end of the addition, stirring is continued for a further 5 minutes. This was filtered through a 100-mesh wire net to obtain a web coater liquid 11.

[Comparative Example 4] Off-con (available from Shin-Etsu Silicone Co., Ltd., 38% non-volatile content), which is a commercially available silicone emulsion for web offset presses, was diluted with 49 times water, and 1 part by weight of a silicone-based defoamer was added thereto. The resulting solution was used as a web coater liquid 12.

[Evaluation Method] An indigo ink was printed on a coated paper (manufactured by Nippon Paper Industries Co., Ltd.) using an RI tester, and then coated with a web coater solution prepared in Examples and Comparative Examples using a hand puller. As a piece, friction resistance,
The slip angle was evaluated. In addition, the test piece to which the web coater solution was not applied was evaluated as a blank.

1. Abrasion Resistance Using a dyed rub fastness tester (manufactured by Daiei Kagaku Seiki Seisaku-Sho, Ltd.), the printed surfaces of the same test pieces were visually rubbed 20 times with a load of 500 g to determine the degree of damage on the printed surfaces. A: No change on the printed surface B: Slight streak lines C: Some streak scratches D: Scratches with no commercial value Sliding angle The printed surfaces of the test pieces were aligned with each other, and measured using a friction meter AN type (manufactured by Toyo Seiki). 3. Printing workability As a result of applying the web coater liquids of Examples and Comparative Examples to printed matter by a web coater using an offset rotary press in practice, printing, cutting and bookbinding were performed without any problem. Δ: A slight problem occurred during printing, cutting, and bookbinding. ×: Printed material slipped, printing was interrupted, and problems occurred during cutting and bookbinding. 4. Viscosity Using a cone-plate type EL viscometer, measured values at a liquid temperature of 25 ° C. and a rotation speed of 100 rpm were used as evaluation values.

[0037]

[Table 1]

[0038]

[Table 2]

[0039]

EFFECT OF THE INVENTION By using the web coater liquid of the present invention, it is possible to impart sufficient friction resistance to the printing paper surface, prevent scratches on the surface of the printed matter, and provide appropriate slip properties. Cutting and bookbinding can be performed efficiently without lowering the printing speed. Furthermore, there is no poisoning of the platinum catalyst of the deodorizing combustion device, and the cost of the final printed matter can be reduced.

Further, it is possible to prevent the surface of the printed matter from being damaged,
It is possible to provide a printed material with reduced costs by efficiently performing the work of cutting and binding.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Motoko Ishii 1-23-37 Edobori, Nishi-ku, Osaka-shi, Osaka Inside Sakata Inx Co., Ltd.

Claims (6)

[Claims] 1. The polyolefin wax is used in an amount of 0.1 to 3.
A web coater liquid comprising an aqueous dispersion containing 0% by weight, wherein the total non-volatile content in the aqueous dispersion is 0.2 to 1%.
A web coater liquid for an offset printing press, wherein the weight is 0.0% by weight and the proportion of the polyolefin wax to the total nonvolatile components is 5 to 100% by weight. 2. The aqueous dispersion has a viscosity of 5 m at 25 ° C.
2. The web coater liquid for an offset printing press according to claim 1, wherein the liquid is Pa · s or less. 3. A web coater solution for an offset printing press according to claim 1, wherein the web coater solution contains a water-soluble resin and / or a resin emulsion having a glass transition point in a range of -40 ° C. to 50 ° C. 4. A method of printing by an offset printing machine to obtain a printed material, wherein the step of applying the web coater liquid according to claim 1 using a coating apparatus is performed after the drying step. Manufacturing method of printed matter. 5. The method for producing a printed matter according to claim 4, wherein a slip angle between printed surfaces of the printed matter coated with the web coater liquid is 10 degrees to 30 degrees. 6. A printed matter, wherein the web coater liquid for an offset printing press according to claim 1 is applied, and a slip angle between printed surfaces is in a range of 10 to 30 degrees.