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Dehydration method for hydrous pigment paset and dehydration device

A dehydration device and pigment paste technology, applied in the direction of pigment slurry, organic dyes, etc., can solve the problems of reducing production capacity, unable to achieve continuous operation, unable to handle batch processing of water-containing pigment paste, etc.

Inactive Publication Date: 2006-11-29
DAINIPPON INK & CHEM INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The kneader process is batch-type and cannot be operated continuously, so it is difficult to increase production capacity
[0010] As mentioned above, in the processing method implemented by means of a conventional kneader, until the water washing and dehydration treatment of one processing unit of the aqueous pigment paste is completed, it is a batch process that cannot handle other aqueous pigment pastes, and there is a tendency to reduce production capacity
[0011] In addition, since the conventional method is to dehydrate while heating and depressurizing, depending on the type of pigment, if this heating treatment is used, problems such as poor quality will occur.
For example, we know that yellow pigments will become opaque and poor in quality after heat treatment

Method used

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  • Dehydration method for hydrous pigment paset and dehydration device
  • Dehydration method for hydrous pigment paset and dehydration device
  • Dehydration method for hydrous pigment paset and dehydration device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Examples of dehydration of the aqueous pigment paste by means of an extruder are shown below.

[0067] 〔using a machine〕

[0068] Extruder:

[0069] Granulation compound type E×DFs-60 (Fuji powder not manufactured)

[0070] DC motor: 2.2km revolution 40min -1

[0071] Screw diameter: 58mm x 2 screw peripheral speed, 7.3m per minute

[0072] Screw pitch: 50mm

[0073] Screw length: 170mm

[0074] Biaxial screw outer diameter clearance (space, clearance): 3mm

[0075] Gap between screw and sleeve: 1mm

[0076] Diameter of extrusion die hole: 3mm×51 (opening rate 6.4%)

[0077] Body tilt angle: 10 degrees

[0078] 〔Using paint paste〕

[0079] Paste for lithographic yellow ink (for printing) (pigment concentration 17.2%, water content 21.0%), manufactured by Dainippon Ink & Chemicals Co., Ltd.)

[0080] The dehydration of the pigment paste is carried out using the machine.

[0081] The water content of the dehydrated pigment paste was measured using a Karl-Fisch...

Embodiment 2

[0087] Examples of dehydration of aqueous pigment pastes by means of extruders and roll mills are shown below.

[0088] 〔using a machine〕

[0089] Extruder: same as that used in Example 1.

[0090] Roller mill:

[0091] Three roll mills, model number, 15-S5-SH (manufactured by Inoue Seisakusho)

[0092] Motor: 37KW

[0093] Roller diameter: 40mm

[0094] Top roller revolution: 200min -1

[0095] Roller rotation ratio: 1:3:9

[0096] 〔Using paint paste〕

[0097] Same as the paste used in Example 1.

[0098] Use the machine to dehydrate the pigment paste, and use the same method as in Example 1 to measure the moisture content of the dehydrated pigment paste.

[0099] Table 2 shows the dehydration results.

[0100] moisture

1st stage dewatering with extruder

9.8％

2nd stage dewatering with the aid of a roller mill

6.4％

[0101] In this way, the dehydration rate can be improved by combining the extruder and the roller mill.

...

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PUM

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Abstract

Provided is a dewatering method and dewatering device for a hydrous pigment paste which make continuous production feasible and do not require heating nor pressure reducing. The dewatering method for the hydrous pigment paste comprising passing the hydrous pigment paste through an extruder having a perforated plate on a discharge side thereby separating the moisture in the hydrous pigment paste and the dewatering device for the hydrous pigment paste comprising having the extruder for separating the moisture in the hydrous pigment paste housed in a barrel 4, in which the extruder has the perforated plate 2 on the discharge side of the barrel and the barrel is installed to incline so as to make the barrel higher toward the discharge side.

Description

technical field [0001] The present invention relates to a method for dehydrating a water-containing pigment paste and a dehydrating device for carrying out the method. Background technique [0002] The washing process is widely used as a method of making paste inks such as sheet ink and rotary ink for master paste board printing. [0003] The so-called rinsing process means that the water-containing solidified pigment and the vehicle are mixed in a kneader, and the water and the vehicle are exchanged, and the separated water is decanted mechanically or heated and depressurized. Dehydration is performed to produce a substrate for printing ink production, or a production process aimed at making an ink that is the final product in one fell swoop (quote "One Color Materials Engineering Handbook P.1007, Asakura Shoten"). [0004] Since the rinsing process does not use heat-dried powdered pigments, the pigments are less agglomerated and difficult to disperse, and thus are conside...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B67/06C09D17/00
Inventor 笠井正纪松木智裕野口典久水口聪
Owner DAINIPPON INK & CHEM INC
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