Method for drying honeycomb molded body and method for manufacturing honeycomb structure

A drying method and molding technology, which can be used in manufacturing tools, ceramic molding machines, etc., can solve the problems of increased man-hours, difficult production, and reduced productivity of honeycomb structures.

Inactive Publication Date: 2018-12-21
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, there may be a problem that the dried honeycomb body needs to be adjusted in size by grinding the peripheral part, etc., and man-hours increase, and the productivity of the honeycomb structure as the final product decreases and production becomes difficult.

Method used

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  • Method for drying honeycomb molded body and method for manufacturing honeycomb structure
  • Method for drying honeycomb molded body and method for manufacturing honeycomb structure
  • Method for drying honeycomb molded body and method for manufacturing honeycomb structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] First, as a ceramic raw material, a cordierite material obtained by mixing alumina, kaolin, and talc is used, and a binder containing an organic binder, a pore-forming material, and water (73% by mass) as a dispersion medium are mixed. Mixing to obtain clay.

[0057] The obtained clay was extrusion-molded to obtain an unfired honeycomb formed body having cells having a square cross-sectional shape orthogonal to the direction in which the cells extend. For this unfired honeycomb formed body, the diameter ( figure 1 The maximum length in the Y direction in) is 126mm, and the length (the length in the direction in which the compartment extends ( figure 1 The length in the X direction in )) is 220 mm, and the outer shape is cylindrical.

[0058] For the obtained unfired honeycomb formed body, the moisture content is 42%, and the cell density is 40 cells / cm 2 , The thickness of the compartment wall is 210μm, and the mass is 1250g. Two unfired honeycomb formed bodies like this we...

Embodiment 2～5

[0068] (Examples 2 to 5, Comparative Examples 1 to 4)

[0069] Except for changing the conditions shown in Table 1 and Table 2, in the same manner as in Example 1, the unfired honeycomb formed body was dried. The results in this drying method are shown in Table 1 and Table 2.

[0070] In Examples 4 and 5, the moisture content of the unfired honeycomb molded body was 23%. In addition, in Comparative Example 2, the same honeycomb formed body as the unfired honeycomb formed body used in Example 1 was used, and the unfired honeycomb formed body was obtained before drying. 26% of all moisture contained before drying was removed. The dry honeycomb molded body. In this comparative example 2, when the induction drying process entered the microwave drying process, the honeycomb formed body was cracked. In addition, "crack" refers to a state where a part of the partition wall of the honeycomb formed body is cracked.

[0071] In addition, in Examples 2 to 5 and Comparative Examples 1 to 4, ...

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Abstract

Provided is a method for drying an unbaked honeycomb molded body by which the honeycomb molded body can be uniformly dried with little fluctuation in temperature distribution inside the honeycomb molded body during drying and by which a fine-quality honeycomb dried body is obtained with good productivity, the unbaked honeycomb molded body being constituted by a ceramic material and a material composition containing water, and having a cell wall that partitions and forms a plurality of cells extending from one end surface to the other end surface, the method comprising: a dielectric drying stepof performing dielectric drying of the unbaked honeycomb molded body while maintaining a temperature in a central part of the unbaked honeycomb molded body of 100 DEG C or less to obtain a primary dried honeycomb molded body from which 30 to 70% of a total moisture content contained in the unbaked honeycomb molded body before drying has been removed; and a microwave drying step of performing microwave drying of the primary dried honeycomb molded body obtained in the dielectric drying step to obtain the honeycomb dried body from which the remaining moisture content has been removed.

Description

Technical field [0001] The present invention relates to a method for drying a honeycomb formed body and a method for manufacturing a honeycomb structure. In more detail, the present invention relates to a method for drying a honeycomb formed body and a honeycomb structure in which the temperature distribution in the honeycomb formed body during drying is small, can be dried uniformly, and can obtain a good-quality honeycomb dried body with good productivity 的制造方法。 Manufacturing method. Background technique [0002] In the past, ceramic honeycomb structures have been widely used for catalyst carriers, various filters, and the like. In addition, the ceramic honeycomb structure is also used as a diesel particulate filter (DPF) for capturing particulate matter (particulate matter (PM)) discharged from a diesel engine. [0003] This honeycomb structure is usually obtained by extruding the clay to produce a honeycomb-shaped molded body (honeycomb molded body), drying the honeycomb molde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B11/24
CPCB28B11/243B28B11/241
Inventor 奥村健介朝仓德洋
Owner NGK INSULATORS LTD
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