How to Measure the Specific Value of Resin Gloss?
1. What is the resin gloss related to?
The gloss of the same type of resin is also different. For example, the acrylic resin has the same gloss as the hydroxyl resin, which is related to the monomer used. The styrene monomer can increase the fullness and gloss of the film. The fullness of the resin is usually not very good. It is generally believed that the gloss of the following resins is relatively good: melamine resin, ABS, PP, HIPS, PA, POM, PMMA and PPO, etc. Among them, melamine resin and ABS are the two most prominent gloss. For the same resin, the synthetic methods are different. The gloss of the corresponding resin products is also different.
In addition to the resin raw materials, the processing technology and filler ingredients will also have a difference in gloss after resin molding.
2. Method for measuring gloss of resin by portable gloss meter
Resin gloss refers to the ability of the resin surface to reflect light in the same direction under the light after curing. Resin gloss indicates the brightness of the product after processing and curing. The product surface made of a resin with a high gloss is better in brightness. The resin gloss is expressed by specular gloss. The unit is%. The higher the percentage of gloss, the better the surface mirror effect.
Different plastic parts products have different requirements for resin gloss. Generally speaking, the gloss of the interior parts is not high, because the resin materials with high gloss can stimulate people's color. And various decorative plates have certain requirements for gloss to ensure that plastic parts can meet quality standards or produce high-quality decorative products. In order to control the appearance characteristics of plastic products, it is necessary to accurately measure the gloss of different types of resins. A common method is to use a portable gloss meter to measure.
3. How to choose resin gloss measurement angle?
The measurement results are different depending on the angle of incidence. The larger the angle of incidence, the greater the specular reflectance and the higher the gloss. That is why high-gloss materials should be measured with a high-gloss testing equipment at a 20-degree angle; otherwise, the lower the specular reflectance, the lower the gloss. Then we can use a portable gloss meter with an 85-degree angle. It can be seen that the gloss of the resin depends not only on the surface characteristics of the resin, but also on the measuring angle of the instrument.
As for what angle is best for which materials, there is no uniform national standard. The 60-degree angle generally used on the market is like LS192, a universal 60-degree portable gloss meter from Linshang Technology. High gloss materials can be tested because the gloss is a relative value. When there is no uniform standard in the applied industry, it can be tested with the LS192 portable gloss meter.