Plastic particles are used as raw materials for the production and injection of plastic products, and are widely used in various plastic products. The product quality, color and moisture of the plastic particles directly affect the quality of the plastic products after the injection of the plastic particles. In particular, the surface moisture of plastic particles is an important factor affecting their products. Since the injection molding process is a high-temperature molding process, if the surface of the particles contains a certain amount of water, the water on the surface will vaporize to generate bubbles during the high-temperature molding process. The existence of plastic products may also cause the uneven thickness of the plastic products, thereby affecting the appearance and strength of the plastic products. Therefore, the actual measurement of the moisture content on the surface of particles has become a key procedure for plastic particles and plastic products.
In actual work, the method we use for the moisture on the surface of the plastic particles is to use the weight loss method of heating, that is, by heating to a certain temperature, the moisture on the surface of the particles is volatilized, thereby measuring the moisture on the surface of the particles. Commonly used analytical instruments are oven heating, electronic balance weighing, and manual calculation. Because this test method takes too long and has certain errors, it is not very convenient to operate. Now more manufacturers choose the rapid moisture analyzer to test the moisture in the plastic particles, usually infrared or halogen moisture analyzer. Reference model: M-20A or SFY-20A halogen rapid moisture analyzer. The time for testing a sample is about 5-10 minutes, the result is highly accurate, and it is very convenient to use.
Some time ago, users reported that they used a rapid moisture analyzer to test the moisture in plastic particles, which is higher than the moisture test data provided by other manufacturers. Later, after our analysis, we found that the problem lies with their samples. Their samples contain other volatile solvents in addition to water. During the heating process, when evaporating water, they also evaporate other volatile solvents, resulting in high water content. According to the characteristics of enterprise samples, we also choose a new test method, using Karl Fischer volume method, choose V10 plus intelligent automatic moisture analyzer, accurately and quickly determine the surface moisture content of plastic particles, and the result is Admitted that this method is also the latest test method for the surface moisture test of plastic particles. The cost of choosing the same imported moisture analyzer is basically 70,000 to 80,000 yuan.
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