Views: 3 Author: Site Editor Publish Time: 2023-05-06 Origin: Site
Injection molding is a common manufacturing process used to inject plastic materials into injection molds to create products of various shapes. However, in the production process, there are often some problems, such as radiation lines. Here are the causes and solutions for radiation streaks.
First, the cause of radiation lines in injection molding
1. Injection mold problems: the surface of the injection mold is uneven, worn or deformed, which leads to uneven material flow during molding and jet marks.
Melt temperature is not enough: too high or too low temperature of melt will affect the molding quality, especially in the T/A injection mold with common radiation lines, if the temperature of melt is not appropriate, it will lead to the material in the injection mold stay too long, resulting in radiation lines.
2. Uneven molding pressure: uneven molding pressure will lead to uneven distribution of materials in the injection mold, resulting in radiation lines.
3. Plastic material problem: the quality of the plastic material used is not good, or it is polluted in the process of processing, which will also lead to the generation of radiation lines.
4. Too fast production speed: too fast production speed will lead to uneven material cooling, resulting in radiation lines.
Two, injection molding appears the solution of radiation lines
1. Check whether the surface of the injection mold is smooth and deformed, and repair or replace it if necessary. At the same time, it is also necessary to clean and maintain the injection mold regularly to ensure the finish and smoothness of the injection mold surface.
2. Adjust the melt temperature to ensure that it is within the appropriate range. Generally speaking, the melt temperature of T/A injection mold should be controlled between 180 and 220 ℃.
3. Check whether the molding pressure is uniform and adjust it if necessary. The method of segmental molding can be used to gradually increase the molding pressure, so that the material is distributed more evenly in the injection mold.
4. Choose high-quality plastic materials and ensure that they are not polluted in the process of processing. Before processing, plastic materials can be sampled to ensure that their quality meets the requirements.
5. Adjust the production speed to ensure uniform material cooling. Slow production can be used to allow sufficient time for the material to cool, thus reducing the generation of radioactive lines.
Radiating streaks often occur when the molten material enters the mold cavity and the front end of the fluid stops developing in the direction. It often occurs in injection moulds with large cavities where the molten flow does not directly touch the mold wall or encounter obstacles. After passing through the gate, some hot molten material comes into contact with the relatively cold surface of the mold cavity and cools down. In the process of filling the mold, it cannot be closely combined with the subsequent molten material.