Classification and processing technology of ceramic tile cracks

1. Classification of cracks in wall and floor tiles:

Cracks in wall and floor tiles are divided into five types according to their appearance: transverse crack, straight crack, angular crack, intermediate crack and bottom crack. According to the causes of cracks, it can be divided into mechanical cracks and thermal stress cracks. Mechanical cracks are defects caused by excessive mechanical stress; the direct cause of thermal stress cracks is cracks caused by stress concentration caused by excessive or uneven heating or warming.

2. Reasons for mechanical stress causing cross-section of wall and floor tiles:

2.1 The elevator vibration is too large and the belt operation is unbalanced;

2.2 The glaze line belt is unbalanced, the pulley is stuck with debris, and the bracket is too high to grind the bottom of the brick;

2.3 platform and drying, the roller bar in the front part of the kiln appears to be beating and caused by nails or sundries;

2.4 The strength of the green body is insufficient and the molding pressure is insufficient.

3. Method for detecting cracks in wall and floor tiles:

3.1 The method of rubbing oil: use the sponge to stain the kerosene to wipe the four sides of the blank in order, and check in which process segment the crack is generated. If a crack is found in a certain process segment, then the previous process in which the crack is generated at the position can be judged. The order of the search is: the kiln inlet printing machine, the drying machine before the drying machine, the dry exit before the printing machine, and the dry inlet before the drying machine After the lift platform in front of the press platform.

3.2 Direction of change judgment: If a small crack is generated or a micro-polishing polished brick is produced, when the crack cannot be detected by the rubbing method, the blank must be turned 90 degrees at the inlet of the kiln and the platform of the press (before the elevator). The kiln or the drying kiln is marked with a mark to check whether the crack changes direction after the kiln is discharged from the kiln.

3.2.1 Turn the brick into the drying kiln on the press platform by 90 degrees. If the crack changes with the direction of the blank, the crack is from the press process, which may be the demoulding of the fabric and the roll or platform roll. Caused by rod inequality.

3.2.2 Turn the brick into the drying kiln at the inlet of the drying kiln. If the crack does not change with the direction of the blank, the crack is from the drying kiln process. The crack generated in the drying kiln is divided into: if the crack appears on the front edge of the brick and perpendicular to the direction of the roller, the temperature in the accelerated drying stage is too high, and the air humidity is too small; otherwise, if the crack appears on the trailing edge , caused by insufficient drying speed and the temperature of the drying stage; if cracks appear on both sides of the brick and parallel to the direction of the roller, there may be excessive drying temperature, excessive drainage or too low drying temperature, and The strength of the blank is insufficient, and it is also considered whether it is caused by mechanical stress factors such as unevenness and jumping of the stick.

3.2.3 The printing machine adjusts the direction before and after, and can intuitively judge whether the belt of the printing machine or the blade of the printing machine adjusts the crack caused by the imbalance.

3.2.4 When the brick is transferred to the kiln by 90 degrees, it can be judged whether the crack belongs to the kiln heating stage or has not existed before entering the kiln, and then the corresponding scheme is adjusted according to the characteristics.

3.3 The moisture content of the blank and the surface temperature of the blank: The blanks of each column are taken out and the moisture content is measured, and the surface temperature of each column of the fresh kiln is measured in combination with an infrared thermometer, if a column of bricks The water content is low, and the surface temperature of the green body is higher than the other columns, indicating that the crack is caused by the excessive temperature of the corresponding side when drying.

3.4 Marking method: Install an automatic marking machine at the exit of the drying kiln (or arrange a special person to make a mark). You can use a variety of color materials to mark the blanks of different columns and different layers separately, and then crack the kiln after firing. Bricks are classified and statisticed to find out why.

3.5 Classification statistical judgment method: After the bricks to be marked are fired out of the kiln, the surface of the blank is wiped with the diluted pure blue ink, and the crack data of each layer of dry bricks and the crack data of different columns of each layer are counted, and then The scheme is adjusted according to the common features of the blank crack. [Follow the WeChat public number "Jiuzheng Ceramics Network" ; pay attention to surprises, scan code reading "how to do sales management of tile terminals? 》The wonderful content! Jiuzheng Ceramics Network Exchange Group: 80123558 】

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