How to check the flatness of the product Because the ceramic product is fired at a high temperature, deformation cannot be completely avoided. Even the superior products are subject to change. The national standard for deformation (side bending) is: 0.2% for porcelain polished tiles (maximum deviation ≤ 2.0mm); ±0.5% for other porcelain tiles; ±0.5% for glazed tiles; +0.5 for glazed tiles %-0.3%.
The errors produced by regular manufacturers are generally smaller than the national standards. Dongpeng's internal control standards are: polished tiles (excellent products) is ±0.12%; color glazed tiles (excellent products) are ±0.25%, and glazed interior wall tiles (excellent products) are +0.3%-0.1%. The standards set by the state are expressed in percentages, and must be converted into (mm) units when used normally. The conversion method is: side length × deformation standard (%) × 100% = product deformation value. Take polished tile 800 as an example: 800 × (± 0.12%) × 100% = deformation value.
Simple on-site inspection methods for ceramic products are:
1. Spread more than four products in the uniform direction of the bottom mark (pattern) on the flat sand floor, and reserve the expansion gap to see if the intersection of the four sides is flat and there is no obvious "kicking" phenomenon.
2. Use a ruler that is longer than or equal to the length of the brick, and place it directly at a distance of 5 mm from the edge of the brick. Use a suitable feeler gauge to insert a large value from a small value into the gap between the ruler and the brick surface. The deformation value is the deformation value of the product.
3. It is not correct to place two products face to face to observe and measure the flatness; it is not correct to use the eyes to visually measure, or to use two bricks to rotate on the flat ground and the table top. The commonly used detection method is to use a ruler to detect.
4, a simple method to detect the deformation of the tile: two people with two pieces of deformed tiles by hand, with the brick edge to the edge of the brick to see if it is flush. If the difference between the deformation of the two bricks is large, the method is used to detect. If you want to know whether the deformation value of the product exceeds the standard, use the 2 method to detect.
5, according to the requirements of different types of products, must be reserved when testing the product. In particular, the characteristics of antique bricks, elegant sandstones, natural surfaces and other products have determined that 5-15 mm gaps must be reserved for paving.
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