JPS61191553A - Lightweight clay roof tile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to clay roof tiles, and more particularly to clay roof tiles whose weight is reduced using specific manufacturing raw materials.

Conventional Technology Among the roof tiles used in buildings, those called clay tiles are manufactured using clay, a local specialty produced in each area, as a raw material. These clays are generally quartz 1. feldspar,
It consists of kaolin minerals, montmorillonite minerals, micaceous clay minerals, etc.

Clay tiles manufactured using the above-mentioned clay have disadvantages such as low contract strength and deformation during firing. Currently, when clay tiles are manufactured, the thickness of the clay tiles is increased, resulting in lack of strength and easy deformation. Compensating. Generally, the vertical and horizontal dimensions of clay tiles are specified by JIS A 5208, and for example, for type 53A, the vertical and horizontal dimensions are specified as 305±41nL, but there is no specific standard for wall thickness. Current clay tiles are approximately 15 IIS.

For this reason, the manufactured clay tiles are heavy, which not only makes transportation of the products inconvenient, but also imposes a burden on firing fuel costs and the like during the manufacture of clay tiles.

Regarding the manufacturing method of such clay tiles, see Japanese Patent Application Laid-Open No. 59-1079.
Reference may be made to Japanese Patent Application Publication No. 54, Japanese Unexamined Patent Publication No. 116169/1984, and the like. The former is characterized by a method of mixing clay with sand powder made of quartz and feldspar, and the latter is characterized by a method of mixing foundry dust collection dust silica sand with clay.

Problems to be Solved by the Invention The present invention has been pursued independently from the above-mentioned methods, and aims at a more effective method for reducing the weight of clay roof tiles.

Means for Solving the Problems According to the invention, the MgO component is preferably about 20 to 65
Mineral powder containing 3-20% and silica powder 0-10%
and clay, a mixture of 97-70% ±? It is characterized by forming a tile base and firing it to obtain a clay tile.

The present inventor has discovered that the mechanical strength of a clay tile can be increased by mixing a mineral powder containing an MgO component, which will be described later, into raw clay, and has thus arrived at the present invention. In other words, the present invention can reduce the thickness of the product tile without sacrificing its strength, thereby producing a lightweight clay tile. It became possible to obtain.

In general, examples of minerals containing the MgO component χ include talc, magnesite, serpentine, cordierite, rhomboidite, dolomite, and the like. However, in the present invention, it has been found that the desired strength cannot be obtained for rhomboidite and dolomite. Therefore, the minerals containing the MgO component that can be used in the present invention are the above-mentioned minerals and their analogues, excluding diamondite and dolomite χ.

The mixing ratio of this mineral powder containing MgO component to clay can be appropriately selected depending on the required mechanical strength of the clay tile, but is preferably 3 to 20%, particularly 20%.
If it exceeds 'Y, the strength will increase, but the amount of clay on the base will be insufficient, the plasticity will decrease, and molding will be difficult. Moreover, if it is less than 3%, the mechanical strength of the fired clay tile will not be sufficient.

Furthermore, in the present invention, it may be advantageous to add silica powder at the same time. This raw material is used to adjust the firing shrinkage of tiles when the base material according to the present invention is molded and fired.

The silica powder that can be used in the present invention preferably has a particle size of 200 mesh or less. The mixing ratio of the silica powder can be appropriately determined depending on the mixing ratio and type of the MgO component-containing mineral powder, but it may be added up to 10% at most.

5&C The present invention is a method for manufacturing a clay tile using a base material in which clay is combined with mineral powder containing MgO Flft and, if necessary, silica powder. Any type of clay that is produced in various places can be used.

Is this invention applicable to Miura clay, which is used in Mi-shu tiles, which are considered to be a typical clay tile? explain.

Example 1 The base material was made using the following raw materials and their mixing ratios.

Mikawa tile clay 89.5 parts Retrieved rock powder from Toba, Mie Prefecture 9 parts Silica powder 4.5 parts The clay tiles were dried in a forced drying chamber for about 30 hours and fired in a clay tile tunnel kiln at 100°C for 19 hours to obtain clay tiles.

Example 2 A clay tile (2) was obtained in the same manner as in Example 1. The mixture was changed as shown below, and the water content at the time of crosstalk was 18%.

Mikawa tile clay 76 parts Retrieved rock powder from Toba, Mie Prefecture 18 parts Silica stone powder 9 parts Example 3 A clay tile (3) yal was obtained in the same manner as in Example 1. The ingredients and proportions of the mixture were changed as shown below, and the moisture content at the time of crosstalk was reduced by 2.
It was set to 0%.

Miura clay 84.9 parts Talc powder 13.5 parts Silica powder 1.7 parts Example 4 (Reference Example) A clay tile (4) was obtained in the same manner as in Example 1. The ingredients and proportions were changed as shown below, and the water content during crosstalk was 18.6 ml.

Mikawa tile clay 82.5 parts Magnesium mineral powder 9.1 parts Silica powder 8.4 parts Above clay tile [1), +21. (31 and (4) were compared with conventional clay tiles and summarized in the table below.

Effects of the Invention As is clear from the table above, the effects of the present invention are as follows: (a) Despite the fact that the wall thickness of the clay tile has been reduced by 20% and the weight of the clay tile has been reduced by about 20%, , JI8 A5208
The bending failure load specified for clay tiles is the same or higher than that (B) This indicates the mechanical strength of clay tiles, and the quality of clay tiles themselves has improved even from the difference in bending strength. (/i) The freezing damage resistance of clay tiles is improved by decreasing the water absorption rate, and the increase in the coefficient of thermal expansion is characterized by the fact that the glaze can be made thinner. Improve compatibility with
It is effective in preventing penetration of glaze.

Claims (1)

[Claims] Mineral powder containing MgO component 3-20%, silica powder 0
A lightweight clay tile characterized by being made by molding and firing a mixed base soil of ~10% and tile clay of 97-70%.