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2025-03-06
For porcelain products, bright color is an important sensory basis for consumers to choose porcelain, which can give people a good visual experience. Generally speaking, the better the color of porcelain, the higher the gloss; otherwise, it is low. So, what are the requirements for porcelain gloss? How to measure porcelain gloss? The following is an introduction.
porcelain
Gloss is a physical property of the surface of an object. When exposed to light, the different states of the porcelain glaze surface will cause the glaze to reflect different intensities, resulting in different glossiness. Glossiness indicates the ability of the glaze to reflect incident light as a mirror, and also characterizes the flatness of the glaze surface. Its size is related to the refractive index of the glaze surface and the firing system. The greater the refractive index, the higher the glossiness of the glaze. The glossiness of porcelain is related to the smoothness and refractive index of the glaze surface. It depends on the degree of mirror reflection of light on the glaze surface, and is one of the important appearance indicators of finished porcelain products. If the glaze surface is smooth and the reflection effect is strong, the glossiness is good.
As the level of consumer spending increases, the quality standards of ceramic products are also being adjusted and improved. The quality indicators of products produced by manufacturers must meet national standards before they can be exported or put on the market. In the quality inspection standards for ceramic products: the gloss index of daily-use porcelain must be >85 for high-quality products and >80 for qualified products. In order to achieve this standard, when formulating the formula, the requirements for the gloss of the porcelain glaze should be considered first, and the formula should be designed scientifically and rationally, and the various raw materials required should be selected to produce products with smooth and smooth glaze. Therefore, in order to accurately measure the gloss of porcelain and provide a digital reference for its production process, a gloss meter can be used.
45° Angle Porcelain Gloss Meter
Gloss is a physical quantity that evaluates the ability of a material surface to reflect light under a set of geometrically specified conditions. It has a direction-selective reflection property. A gloss meter, also called a gloss meter, is an instrument used to measure the surface gloss of materials such as ceramics, paints, inks, plastics, marble, aluminum, and hardware. The gloss meter measures the gloss of a sample using the principle of light reflection. That is, the sample is illuminated under the conditions of a specified incident angle and a specified light beam to obtain a light source in the direction of the mirror reflection angle. The gloss measurement head consists of an emitter and a receiver. The emitter consists of a light source and a set of lenses, which produces an incident light beam with certain requirements. The receiver consists of a lens and a photosensitive element, which is used to receive the cone light beam reflected from the sample surface and convert it into an electrical signal to obtain the final test result.
The existing testing method for measuring the glossiness of daily-use ceramics is GB/T3295 "Test Method for 45° Mirror Glossiness of Ceramic Products". This standard adopts the refractive index n=1.567 of its reference standard, and the non-equivalent standard is ASTMC346 (the corresponding standard of the refractive index adopted by the American Society for Testing and Materials standard is nD=1.540). Therefore, when using a gloss meter and gloss standard plate calibrated according to the ASTMC346 standard, the measured value must be divided by the conversion coefficient K. When the incident angle θ=45°, K=0.599.
The measurement method is: randomly select three daily-use ceramic samples, read their gloss values directly on the instrument according to the instrument's operating principle, and divide the value by 0.599 to get the gloss value of the sample. When measuring, first preheat the instrument and adjust the zero, then calibrate the instrument display with a black gloss work plate, and then use a white gloss work plate to check the instrument and the previous calibration. The gloss of the sample can be measured when the deviation is no more than ±1.0.
