JPH0229476A - Production of high-viscosity printing ink and dehydrator - Google Patents

Abstract

PURPOSE:To produce the title high-quality ink without causing any compositional unevenness, local solidification or film formation of the mixture by using a heat pipe in which induction heating is employed as a heat source as an external heating means in performing dehydration with a dehydrator after primary dehydration is performed by flushing. CONSTITUTION:A mixture of an aqueous pigment slurry or paste with a printing ink vehicle is dehydrated to about 5-10wt.% by the primary dehydration through flushing and is sent to a dehydrator, where it is agitated and transferred. During this time, the mixture is heated with a heat controller 15 while it is dehydrated by evacuation through an exhaust pipe. When a coil 17 is energized, the generated magnetic line of force causes the carbon steel 22 of the wall 2 comprising a ferromagnetic material to generate heat, and the generated heat is transferred to a heat pipe 16 to heat the working fluid sealed in it. The heated fluid liberates heat, condenses at the upper end and returns to the heat absorption part. By the heat generation of the wall 21 itself and the distribution of heat by the heat pipe 16, the temperature distribution of the wall 21 is uniformized, and the mixture in the inside space 3 can be uniformly heated.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a method for producing high viscosity printing ink and a water removal device, and more specifically, after primary dehydration by flushing, when water is removed by a thin film dehydration device, external The present invention relates to a manufacturing method characterized in that a heat vibrator using induction heating as a heat source is used as a heating means, and a moisture removal device used therein.

[Prior art] High viscosity printing inks such as off-hat printing inks can be produced by mixing a pigment and a vehicle and kneading the mixture using three rollers, or by mixing an aqueous slurry or paste of pigment with a vehicle for printing ink. There is a method of flushing using The latter is applied to the production of process inks that require transparency and can be mass-produced.

This flushing method usually requires 5 to 10
The water content becomes 1% (unit 1), and by subsequently mixing while heating under reduced pressure, the final content is 1% or less, preferably 0.5%.
It needs to be about 5%, which requires a long processing time of several hours, and rationalization of manufacturing is desired. For this reason, the present inventors have attempted a process of treating the paste after primary dehydration using a thin film evaporator as described later.

However, commercially available thin film evaporators have only a method of heating from the external jacket 1 by using water vapor as an external heat source, and therefore have various drawbacks in that partial heating tends to occur.

In other words, when the paste after secondary dehydration is processed using a thin film evaporator, the upper part of the paste has more water and the lower part has less water, so ideal heating conditions are responsible for the upper and lower parts. When the paste becomes uniform and local heating occurs in the paste, the solvent in the paste evaporates locally, causing non-uniformity of the composition, and further locally solidifying and becoming foreign matter.
Causes localized film formation.

For this reason, it is desired that a heating device for a thin film evaporator be capable of wide temperature control and uniform heating.

[Problems to be Solved by the Invention] However, in the conventional method of introducing steam to the external jacket 1- for heating, fine adjustment of the heating temperature is difficult;
Furthermore, since it is water vapor, it is impossible to control the temperature below 100°C, so it has to be used within a narrow temperature control range.

The present invention has been made in view of the above-mentioned circumstances, and improves the above-mentioned manufacturing method in which primary dehydration by flushing is followed by secondary dehydration using a thin film evaporator.
The purpose of the present invention is to provide a method for producing a high viscosity printing ink and a water removal device that can be finely adjusted and implement the necessary heating control, thereby improving the quality of the process ink. It is something to do.

[Means for Solving the Problem] Corresponding to this purpose, the high viscosity printing ink of the present invention
Method B involves flushing with an aqueous slurry or paste of pigment and a vehicle for printing ink, and then transferring the dehydrated paste to a vertical cylinder, a rotating shaft in the center of the cylinder, and a stirring shaft attached to the rotating shaft. A method for producing a high viscosity printing ink comprising a step of removing residual moisture by a moisture removal device comprising a transfer means, a pressure reduction means, and an external heating means, wherein at least one of the external heating means of the moisture removal device includes induction heating. It is characterized by using a heat pipe as a heat source.

In addition, the high viscosity printing ink moisture removal device of this invention includes:
It has a vertical cylindrical body and a plurality of cylindrical parts connected in the axial direction, and has a vertical cylindrical body in which an agitation transfer means can be installed, and is guided to the outside of the cylindrical part. A coil is disposed, the wall of the cylindrical portion includes a ferromagnetic material that generates heat due to the magnetic field generated by the induction coil, and a heat pipe is disposed on the wall.

[Function] The mixture of the pigment aqueous slurry or paste 1~ and the printing ink vehicle is first dehydrated by flushing to adjust the water content to 5 to 10% (by weight), and then sent to a water removal device where it is stirred. be transported. During this time,
The mixture is vacuum dehydrated while being given the desired heating by induction heat generation in the body wall and heat transfer by the heat pipe.

[Example 1] Figures 1 to 3 show a water removal device used in the method for producing high viscosity printing ink of the present invention. The moisture removal device 1 has a body 2 having a vertical cylindrical shape. The body 2 has a cylindrical internal space 3. The internal space 3 consists of a steam section 4 at the upper end, an agitation transfer section 5 at the center, and a discharge section 6 at the lower end.

A supply pipe 7 is connected to the steam section 4, and a discharge pipe 8 is connected to the discharge section 6. Further, an exhaust pipe 11 is connected to the steam section 4. A rotating shaft 12 is inserted into the internal space 3 in the axial direction through the lid 9, and a stirring transfer blade 13 is attached to the rotating shaft 12 in the stirring transfer section 5.

The body portion 2 is formed by connecting a plurality of circular in-shaped portions (in the case of this embodiment, four cylindrical portions 2a, 2b, 2c, and 2d) in the axial direction. The cylindrical portion 2 a corresponds to the steam section 4 , the cylindrical portions 2 b and 2 c correspond to the stirring transfer section 5 , and the cylindrical section 2 d corresponds to the JJI outlet section 6 . The aforementioned supply pipe 7 and exhaust pipe 11 are connected to the cylindrical portion 2a, and the exhaust pipe 8 is connected to the cylindrical portion 2d. Particularly important is that the cylindrical portions 2b, 2G have a heating control device 14b.
114c is installed. A similar heating control device 14d may also be attached to the discharge section 6.

Since the heating control devices 14b to 1/1d have substantially the same configuration, the heating control device 14b provided in the cylindrical portion 2b will be described below.

The heating control device 14b includes an induction heating device 15 and a plurality of heat pipes 16. The induction heating device 15 has a coil 1
7 and an iron core 18. This induction heating device 15 itself is publicly known, and a commercially available device can be used.

The wall 21 of the cylindrical portion 2b is the object of heating by the induction heating device 15, and therefore the wall 21 must be made of ferromagnetic material. For this purpose, the wall portion 21 is constructed using clad steel with carbon tA22 coated on both sides with stainless steel 123.24. A coil 17 surrounds the outside of the wall portion 21, and an iron core 18 is located outside the coil 17.

On the other hand, the heat pipes 16 are embedded within the wall portion 21 at a predetermined pitch.

Heating control device 1/Ic for cylindrical portions 2c and 2d
, 14d are also the same.

The method for producing high viscosity printing ink of the present invention is carried out as follows using the moisture removal device 1 described above.

A mixture of an aqueous slurry or base, which is a component of a process ink, and a printing ink vehicle is prepared by primary dehydration in a flashing method to produce a 5-10% (fiffl)
), and in this state is supplied from the supply pipe 7 into the internal space 3 of the body 2, and is stirred by the agitation transfer blade 13 in the agitation transfer section 5, and then transferred to the discharge section 6.
will be transferred to.

During this time, the mixture to be treated is heated by the heating control device 15.
and is dehydrated by exhaust air from the exhaust pipe 11.

The operation of the heating control device 15 is as follows.

When the coil 7 is excited using an oscillator (not shown),
The magnetic lines of force generated from the coil 17 pass through the carbon steel 22 of the wall portion 21 made of ferromagnetic material to form a magnetic circuit, and the carbon steel 22 generates heat. This heat generated by the carbon steel 22 is transmitted to the heat pipe 16.

In the ζ-dopibe 16, the heat absorbing part is heated by the carbon steel 22, and the working fluid sealed inside is heated and evaporated, flows toward the upper end which is the cooling part, releases latent heat at the upper end, and condenses. The working fluid returns to the heat absorption section. In this way, the temperature distribution of the wall part 21 is made uniform due to the heat generated by the wall part 21 itself and the heat distribution by the heat pipe 16, and in addition to this, the temperature distribution of the wall part 21 is made uniform, and the internal space 3
The mixture within is heated evenly.

On the other hand, a cylindrical portion 2b having such a heating control device,
2c, 2d are axially stacked, in this case the respective cylindrical part 2b.

Heating control devices 14b, 14c in 2c, 2d.

14d can be independently temperature controlled, so that an arbitrary temperature distribution can be formed in the axial direction of the internal space 3. Further, the amount of heat generated in each heating control device can be changed by adjusting the output of the oscillator, and fine adjustment is also possible.

The mixture that has been dehydrated in the agitation transfer section 5 and has reached the discharge section 6 is discharged from the discharge pipe 8.

[Advantageous Effects of the Invention 1] In the high viscosity printing ink manufacturing method and water removal device of the present invention, there is no need to provide a steam jacket around the body, so the structure of the device can be simplified. Moreover, M
In order to utilize Q heating, a wide range of temperature control is possible by simply adjusting the output of the oscillator with the die A full, and fine adjustment is also possible.

Furthermore, it becomes possible to divide the heating control device in the axial direction of the body and control it independently, thereby making it possible to form a desired temperature distribution in the axial direction.

Therefore, the mixture can be treated with ideal temperature distribution, and deterioration in ink quality due to uneven composition of the mixture, local solidification, or film formation can be prevented.

[Brief explanation of the drawing]

FIG. 1 is an explanatory front view of a moisture removal device according to an embodiment of the present invention, FIG. 2 is an explanatory longitudinal cross-sectional view of a heating control device, and FIG. 3 is an explanatory view of the section ■-■ in FIG. 2. It is. 2...Body portions 2a, 2b, 2c, 2d--Cylindrical portion 3...Inner space 4...Steam section 5...Agitation transfer section 6...Discharge section 7...Supply pipe 8... Discharge pipe 11... Exhaust pipe 12... Rotating shaft 13... Stirring transfer blades 14b, 14c, 14d... Heating control device 15...
Induction heating device 16...Heat vibrator 17...Coil 18...Iron core 21...Wall portion 22...Carbon steel 23.24...Stainless steel 1...Moisture removal rule

Claims (2)

[Claims] (1) The paste, which has been flushed with an aqueous slurry or paste of pigment and a vehicle for printing ink and has been primarily dehydrated, is placed in a vertical cylinder, with a rotating shaft in the center of the cylinder;
In the method for producing high viscosity printing ink, the method includes the step of removing residual moisture by a moisture removal device that is equipped with an agitation transfer device, a pressure reduction device, and an external heating device, which are attached to the rotating shaft, and an external heating device of the moisture removal device. A method for producing a high viscosity printing ink, characterized in that at least one of the above uses a heat pipe using induction heating as a heat source. (2) It has a vertical cylindrical body and a plurality of cylindrical parts connected in the axial direction, and has a vertical cylindrical body in which an agitation and transfer means can be installed; An induction coil is disposed on the outside, a wall of the cylindrical portion includes a ferromagnetic material that generates heat due to the magnetic field generated by the induction coil, and a heat pipe is disposed on the wall. High viscosity printing ink moisture removal equipment