JPH09263723A - Production of offset ink - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an offset ink continuously at a high speed in a short time without encountering a problem of staining the workshop and the machine with spattered ink. SOLUTION: This invention provide a process for producing an offset ink comprising continuously and consecutively feeding a base color 2, a varnish 3 and a compound 4 and a solvent 5 into a continuous twin-screw knader 1 and kneading them while vacuum-deaerating the mixture and a process for producing an offset ink comprising previously kneading a press cake pigment and a varnish with a continuous twin-screw kneader 1 provided with a dewatering apparatus to form a base color, adding a varnish 3, a compound 4 and a solvent 5 to the base color 5 and kneading them while vacuum- deaerating the mixture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing offset ink.

[0002]

2. Description of the Related Art Conventionally, in the manufacture of offset ink, presscake pigment and varnish are mixed at a predetermined ratio, and water mixed in the pigment is mixed into varnish resin by using a double-arm type kneader (kneader). The base color is manufactured by the flushing method in which the pigment particles are dispersed in the varnish resin while being replaced with the varnish, the step of measuring and mixing the base color, the medium and the varnish, and the three mixed base colors, the medium and the varnish. A step of quantitatively adding a compound after kneading and kneading by supplying on a roll mill, and a step of adding a high boiling point solvent after kneading and adjusting by mixing with a mixer,
After adjustment, repeat 3 to deaerate the air contained in the ink.
It was manufactured by a process of supplying ink to the roll mill and filling it in a designated container. However, in this method, in each process, the work mix and the machine are heavily soiled due to ink scattering at the time of metering and mixing in a tank, kneading in a three-roll mill, filling and adjustment, and the manufacturing time is long in each process. It takes a long time to complete, it requires a moving time due to the movement of the tank, the size of the manufacturing lot is limited, and it is necessary to deal with the aptitude lot. There were various drawbacks such as problems such as peeling of ink and gelation.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for continuously producing a high-speed, short-time offset ink in a short time without removing stains on a workplace or a machine due to ink scattering.

[0004]

A method for producing an offset ink, characterized in that a base color, a varnish, a compound and a solvent are continuously supplied to a biaxial continuous kneader at a predetermined ratio and kneaded. Therefore, it is possible to continuously manufacture the offset ink in a closed system in a short time.

A base color, a varnish, a compound and a solvent, which are produced by sequentially supplying the presscake pigment and the varnish at a predetermined ratio to a twin-screw continuous kneader equipped with a dehydrating device and kneading the mixture, are predetermined. The method for producing an offset ink is characterized in that the mixture is continuously fed to a biaxial continuous kneader at a ratio of 1 to knead. In this case, press cake pigment, varnish, compound and solvent are used to
The offset ink can be produced in the process, which is extremely efficient.

[0006] In the above-mentioned method for producing the offset ink, a gel varnish having a high viscosity and a poor fluidity is used as the varnish. In recent years, the speed of the offset printing press has been remarkably increased, and there is a need for a highly viscous thixotropic offset ink that can prevent misting during high-speed printing of the offset ink. However, the fluidity is poor at low temperatures, and in the winter, when removing from containers, tanks, etc., there is a problem that it is very difficult to take out unless it is in a heated state and it takes time and labor. Although it is difficult to manufacture by the manufacturing method, by using this method, a highly viscous offset ink can be easily manufactured.

The two-axis continuous kneading machine is provided with two parallel rotary shafts in a circle of a body consisting of two circles whose cross-sectional shapes intersect each other, and has a large number of paddles which mesh with each other on the rotary shaft and are in contact with the circle. The cross-sectional shape of one paddle in a cross section perpendicular to the axis of rotation, which is provided in series, is divided into n (≧ 2, integer) sets of long-diameter and short-diameter portions alternately and at equal angles with a gentle curve. And the cross-sectional shape of the other paddle is defined by an outer envelope formed by rotating the rotation axis in different directions and making the rotation speed ratio the same, and rotating in cooperation with one paddle. , M (≧ 2, and n
= M, an integer) sets of a major axis portion and a minor axis portion. By using the twin-screw continuous kneader having the above-mentioned constitution, even when an offset ink is produced using a gel varnish having high viscosity and poor fluidity, the kneading effect is excellent, and therefore the pigment varnish Good dispersion.

[0008]

1 is a schematic view showing a method for producing an offset ink of the present invention, and FIG. 2 is a view showing an example of the structure of a biaxial continuous kneader used in the present invention, FIG. 3 is a diagram showing another example of the structure of the twin-screw continuous kneader used in the present invention, FIG. 4 is a diagram showing the cross-sectional structure of the kneading part in the two-screw continuous kneader, and FIG. FIG. 7 is a partial perspective view showing a combined state, and FIG. 6 is a view for explaining a kneading state of the paddle, wherein 1 is a biaxial continuous kneading machine, 2 is a base color feeding device, 3 is a varnish feeding device, and 4 is a compound feeding. Apparatus, 5 is a solvent supply apparatus, 6 is a control panel, 7 and 8 are filters, 9 is a filling apparatus, 11 and 12 are hoppers, 13 is a vacuum degassing apparatus, 14 is a feeding section, 15 and 17 are kneading sections, 16 is a dehydrator, 18
Is the reverse feeding section, 19 is the body, 21 and 22 are flat paddles, and 23 and 24
Represents a helical paddle, and 25, 26, and 27 represent material spaces, respectively.

As shown in FIG. 1, the method of manufacturing the offset ink of the present invention comprises hoppers 11 and 12 and a vacuum deaerator 13 and a control panel 6 driven by a motor.
A base color and a varnish are respectively supplied from a base color supply device 2 and a varnish supply device 3 to a hopper 11 of a twin-screw continuous kneader 1 having a rotating shaft of a book, and a hopper 12 is supplied from a compound supply device 4 and a solvent supply device 5, respectively. The compound and the solvent are continuously and sequentially supplied at a predetermined ratio, and are kneaded while deaerating the air contained in the ink by the vacuum deaerator 13, and the offset ink produced by the kneading is filtered by the filter 7 , 8, and packing in a container with a filling device. By using the above-mentioned production method, the fluidity increases due to heating and stirring to facilitate the flow, but an extremely high-viscosity and poorly fluid gel varnish having the property of solidifying due to gelation by cooling and standing is used. Therefore, it becomes possible to manufacture a highly viscous offset ink.

The twin-screw continuous kneader used in the method for producing the offset ink of the present invention is disclosed in, for example, JP-A-4-17.
1033, JP-A-6-23251, JP-A-6-23
As described in No. 252, etc., the same number of rotating shafts as the circles are provided in parallel in the body circle consisting of a plurality of circles whose cross-sections intersect, and a large number of paddles that mesh with each other on the rotating shaft and are in contact with the circle. The cross-sectional shape of one paddle in a cross section perpendicular to the axis of rotation, which is provided in series, is formed by n (≧ 2, integer) sets of long-diameter and short-diameter portions alternately and at equal angles with a gentle curve. And further, the cross-sectional shape of the other paddle, by the outer envelope formed by rotating the rotation axis in different directions and making the rotation speed ratio the same and co-rotating with one paddle, m (≧ 2, and n =
(m, integer) pairs of a long diameter portion and a short diameter portion.

In the present invention, the twin-screw continuous kneading machine used for producing the offset ink from the base color, the varnish, the compound and the solvent is composed of two circles having cross-sectional shapes as shown in FIG. 2 parallel to the circle of the body 19
A structure provided with a plurality of rotating shafts, and having a plurality of paddles meshing with each other on the rotating shafts and contacting in a circle.
A hopper 11 is provided near the drive motor M above 19, a hopper 12 is provided near the discharge port, and a vacuum deaerator 13 is provided near the discharge port. A large number of paddles are mounted on the rotating shaft so that they mesh with each other and come into contact with each other in a circle.The feeding section 14 equipped with a screw-type paddle kneads and stirs the supplied various materials and sends them to the kneading sections 15 and 17. Work. The kneading sections 15 and 17 are configured by combining a flat paddle, a helical paddle, and a reverse helical paddle, and the flat paddle performs kneading.
The helical paddle has a function of sending with kneading, and the reverse helical paddle has a function of returning with kneading. The kneading section 15 and the kneading section 17 have a feeding section 14 and a back feeding section between them.
It is used by combining 18 in appropriate combinations. At the end, there is provided a reverse feeding section 18 which is composed of a reverse feeding screw and has a function of kneading and returning.

The production of the base collar according to the present invention is carried out by using the hoppers 11 and 12, the dehydrator 16 and the vacuum dehydrator 13 shown in FIG.
Using a biaxial continuous kneader equipped with and, the press cake pigment and the varnish are continuously supplied at a predetermined ratio and successively kneaded. At this time, the water contained in the press cake is replaced by the varnish resin and separated, so that the separated water is kneaded while being discharged by the dehydrator 16 and further removed by the vacuum dehydrator 13 to remove the base color. Create.

The structure of the twin-screw continuous kneader used for producing the base color from the presscake pigment and the varnish is shown in FIG.
As shown in FIG. 2, the two hoppers 11 and 12 are provided adjacent to each other, and the feeding section 14 provided with a screw type paddle is lengthened, and the kneading section 15 composed of a combination of flat paddle, helical paddle and reverse helical paddle is provided. Provided only in the place,
After that, a reverse feeding unit 18 composed of a reverse helical paddle is provided, and a dehydrator 16 and a vacuum dehydrator 13 are attached. When the presscake pigment and the varnish are kneaded by the biaxial continuous kneader of this structure, the water in the presscake pigment replaced by the varnish resin is retained by kneading in the kneading part 15 and staying in the back feeding part 18. Is discharged by the dehydrator 16 and further dehydrated by the vacuum dehydrator 13 under reduced pressure.

Since the base color can be produced by using the presscake pigment and the varnish according to the above method,
In the method for manufacturing the offset ink shown in FIG. 1, a biaxial continuous kneader having the structure shown in FIG. 3 is installed in place of the base color feeding device 2, and the presscake pigment and varnish are fed to the biaxial continuous kneader. A base color is manufactured by kneading, and the manufactured base color is shown in FIG.
It is also possible to produce the offset ink from the presscake pigment, the varnish, the compound and the solvent in one step by the method of supplying to the axial continuous kneading machine 1.

As shown in FIG. 4, the cross-sectional shape of the kneading parts 15, 17 in the twin-screw continuous kneading machine used in the method for producing offset ink of the present invention is as shown in FIG.
The paddle 21 and the paddle 22 are arranged by shifting the built-in angle of the adjacent paddles on the rotation axis by 60 ° so as to contact the inner surface of the paddle 21, and the top of the long diameter portion of the paddle 21 is the top of the short diameter portion of the paddle 22. Alternatively, the top of the long diameter portion of the paddle 22 rotates while contacting with the top of the short diameter portion of the paddle 21, and the paddle 21 and the paddle 22 are configured to rotate while being in contact with each other at one point during rotation. There is. As shown in the perspective view of FIG. 5, the flat paddles 21 and 22 and the helical paddles 23 and 24 are combined in the kneading sections 15 and 17.
Are combined. The kneading effect can be improved by appropriately combining the flat paddle, the helical paddle, and the reverse helical paddle according to the purpose.

The kneading state is as shown in FIG. 6, and when the paddles 21 and 22 are rotated in the same rotational speed ratio in different directions, a material space formed by the inner wall of the body 19 and the paddles 21 and 22 and containing the material is held. Moves as the paddles 21 and 22 rotate. As shown in FIG. 6A, the material space 25 of the paddle 21 and the material space 26 of the paddle 22 are separated from each other, and the sum of the two material spaces 25 and 26 is maximum in this state. . From this state, the material space 25 of the paddle 21 and the material space 26 of the paddle 22 move when the paddles 21 and 22 rotate by a predetermined angle, and the material space 26 decreases as shown in FIG. 6B. When the paddles 21 and 22 rotate further, the material space 25 of the paddle 21 and the material space 26 of the paddle 22 merge, and the material space 26 becomes almost zero to become the material space 27, which is in the state shown in FIG. 6C. . When the paddles 21 and 22 rotate further, paddle 21
The material space 25 and the material space 26 of the paddle 22 are completely merged and compressed into the state shown in FIG. 6D. By repeating this state, the compressibility of the material in the material space increases and the kneading effect becomes good, and the materials in the two material spaces gather while facing each other, increasing the chances of reliably merging and head-on collision. Since the kneading effect is further enhanced,
It is possible to manufacture offset ink with good kneading. Regarding the twin-screw continuous kneader, even if the twin-screw continuous kneader has two shafts rotating in the same direction, the offset ink can be produced by combining the paddle and the screw.

Example 1 A base color obtained by kneading 7 parts of a yellow presscake pigment and 50 parts of a varnish containing a rosin-modified phenol resin as a main component in a double-arm kneader (kneader), and a white luster T.
A varnish consisting of 13.5 parts of DD, 80 parts of a varnish containing rosin-modified phenolic resin as a main component and 6.5 parts of vegetable oil, 25 parts of polyethylene wax, 35 parts of a varnish containing a rosin-modified phenolic resin as a main component and vegetable oil 1 And a high boiling point petroleum solvent 39 parts, and a high boiling point petroleum solvent, 54 parts by weight of base color, 28 varnishes
Parts by weight, 13 parts by weight of compound, high boiling point petroleum solvent 5
As a supply ratio of parts by weight, a base color of 540 g / min,
Varnish 280 g / min, compound 130 g / min, high boiling petroleum solvent 50 g / min, total 1000 g / min feed rate, twin-screw continuous equipped with kneading section consisting of combination of flat paddle, helical paddle and reverse helical paddle Kneading machine (Extruder KEXN- manufactured by Kurimoto Iron Works)
30) was quantitatively supplied and kneading was performed. Regarding the quantitative supply of materials, the base color is conveyed from the base color supply device by Leocon (Chuo Kogyo Co., Ltd.) and is fed to the twin-screw continuous kneader using the MONO pump (Hyojin equipment, NES-20). Immediately before charging, the mass flow meter (Sakura Endless, Promass 63) is used to adjust the supply rate by changing the rotation speed of the pump according to the output signal of the flow rate change, and the varnish and the compound are straight open drums. A required amount was taken out and the supply amount was adjusted by the number of rotations using a mono pump, and the solvent was introduced into the twin-screw continuous kneader from the inside of the drum using a gear pump. The kneading conditions of the twin-screw continuous kneader are as follows: the base color, the varnish, the compound, and the solvent are supplied at a total of 1000 g / min, the screw is rotated at a rotation speed of 300 to 580 rpm, and defoaming is performed at a vacuum degree of 60 to 40 torr. Operate a twin-screw continuous kneader to knead, and at the discharge port, 1
A yellow ink for an offset rotary press was prepared by filtering through a 00 mesh filter. The physical properties of the obtained ink are as shown in Table 1, and there is no difference from the ink (conventional product) produced by using a three-roll mill, and the printability was also good.

EXAMPLE 2 7 parts of a yellow presscake pigment and 50 parts of a gel varnish containing a rosin-modified phenol resin as a main component and having no fluidity in a gel state at room temperature and having a temperature of 60,000 to 70,000 CPS when warmed, are double-armed. A base color and white luster TDD which are obtained by kneading with a type kneader and have a thixotropic property that does not flow in a gel state at room temperature and has a viscosity of 60,000 to 70,000 CPS when heated and sheared.
Varnish consisting of 20 parts, 70 parts of varnish containing rosin-modified phenol resin as a main component and 10 parts of vegetable oil, 25 parts of polyethylene wax, 50 parts of varnish containing rosin-modified phenol resin as a main component, 5 parts of vegetable oil and 5 parts of high boiling point Supplying a compound consisting of 20 parts of petroleum-based solvent and a high-boiling point petroleum-based solvent, 75 parts by weight of a base color having thixotropic properties, 15 parts by weight of varnish, 7 parts by weight of compound, 3 parts by weight of high-boiling point petroleum solvent As a ratio, base color 3
75 g / min, varnish 75 g / min, compound 35 g / min
And a high boiling point petroleum solvent 15 g / min in total at a supply rate of 500 g / min, and a yellow ink for an offset rotary press was manufactured in the same manner as in Example 1. The physical properties of the obtained ink are as shown in Table 2, and there is no difference from the ink (conventional product) produced by using a three-roll mill, and the printability was also good. Color density: X-Rite 418 Friction resistance: Gakushin-type friction tester Sliding property: Sliding property tester Gloss: GlossGard2 Flow value: Automatic spread meter Tack value: Digital incometer

Example 3 The structure is basically the same as that of the twin-screw continuous kneader used in Example 1, but the feeding section provided with a screw type paddle is lengthened, and a flat paddle, a helical paddle and an inverted helical paddle are provided. By shortening the length of the kneading section consisting of the above combination, and using a biaxial continuous kneader having a structure shown in FIG. 3 equipped with a vacuum dehydrator, a base color was produced by the following procedure. A yellow presscake pigment and a varnish containing a rosin-modified phenol resin as a main component were used as a supply ratio of 50 parts by weight of the varnish to 28 parts by weight of the presscake pigment (25% pigment content), and 280 g / minute of the presscake pigment. Varnish 500
The presscake pigment was weighed in a crushed state at a feeding rate of g / min, and the varnish was weighed in the same manner as in Example 1 using a Mohno pump, and was added to each of the hoppers of the above twin-screw continuous kneader (FIG. 3). Add the base color liquid temperature to 70 ℃
It was replaced by varnish by operating the biaxial continuous kneader at a rotation speed of 450 rpm while adjusting it with cooling water so that it could be maintained at Water in the presscake pigment was discharged from the dehydrator, and further dehydrated by a vacuum dehydrator operating a vacuum pump so that the degree of vacuum was 30 torr to prepare a base color at a rate of 570 g / min. The base color thus obtained was fed to a twin-screw continuous kneader (FIG. 2) in the same manner as in Example 1 to prepare a yellow ink for rotary offset printing.

[0020]

EFFECTS OF THE INVENTION Twin-screw continuous kneading comprising a feeding section having a screw type paddle, a kneading section comprising a combination of a flat paddle, a helical paddle and a reverse helical paddle, and a reverse feeding section having a reverse feeding screw type paddle. Using a machine, a base color, a varnish, a compound and a solvent are continuously and sequentially supplied at a predetermined ratio and kneaded to produce an offset ink, or first, a presscake pigment and a varnish are kneaded to form a base. By using a method of producing a color ink, and further adding a varnish, a compound, and a solvent to the base color and kneading the offset color ink in one step from a presscake pigment, a continuous system in a closed system is adopted. Since it is possible to manufacture offset ink, it is possible to prevent ink from scattering and prevent contamination of manufacturing equipment and workplaces. Since continuous production is possible, work time can be shortened and the number of workers can be reduced. There is a high degree of freedom in the suitability of the lot, and it is possible to prevent the formation of an oxidative polymerization film and gelation when left for a long time. Each user with the same ink type It is possible to obtain fine effects such as fine adjustment for use, easy change of ink flow characteristics regardless of the production amount, and production of highly viscous ink by using gel varnish.

[Brief description of drawings]

FIG. 1 is a schematic view showing a method for producing an offset ink of the present invention.

FIG. 2 is a diagram showing an example of a structure of a biaxial continuous kneader used in the present invention.

FIG. 3 is a diagram showing another example of the structure of the biaxial continuous kneader used in the present invention.

FIG. 4 is a view showing a cross-sectional structure of a kneading section in a biaxial continuous kneader.

FIG. 5 is a partial perspective view showing a combined state of paddles.

FIG. 6 is a diagram illustrating a kneading state of a paddle.

[Explanation of symbols]

1 2-axis continuous kneader 13 Vacuum deaerator 2 Base color feeder 14 Feeding section 3 Varnish feeder 15 17 Kneading section 4 Compound feeder 16 Dehydrator 5 Solvent feeder 18 Reverse feeding section 6 Control panel 19 Body 7 , 8 filter 21, 22 Flat paddle 9 Filling device 23, 24 Helical paddle 11, 12 Hopper 25, 26, 27
Material space

Claims (4)

[Claims] 1. A method for producing an offset ink, which comprises continuously supplying a base color, a varnish, a compound and a solvent at a predetermined ratio to a biaxial continuous kneader and kneading them successively. 2. A base color, a varnish, a compound, and a solvent, which are produced by successively supplying the presscake pigment and the varnish at a predetermined ratio to a twin-screw continuous kneader equipped with a dehydrating device and kneading them successively. 2 continuously at a specified ratio
A method for producing an offset ink, which comprises successively feeding and kneading to an axial continuous kneader. 3. A gel varnish having high viscosity and poor fluidity is used as the varnish.
2. The method for producing an offset ink according to 2. 4. The paddle which is provided with two parallel rotary shafts in a circle of a body composed of two circles whose cross-sectional shapes intersect, the two shafts being in mesh with each other and in contact with the circle on the rotary shaft. Are provided in series, and the cross-sectional shape of one of the paddles in a cross section perpendicular to the rotation axis is alternated by a gentle curve and at equal angles, n (≧ 2, integer) sets of major and minor diameter parts And the cross-sectional shape of the other paddle is defined by an outer envelope formed by rotating the rotation axes in different directions and making the rotation speed ratio the same and co-rotating with one paddle. , M (≧ 2, and n =
4. The method for producing offset ink according to claim 1, wherein the offset ink has a structure having a shape including a long diameter portion and a short diameter portion.