Injection molding is a common plastic processing method that can produce plastic products of various shapes. However, in the process of injection molding, some problems are often encountered, such as short material, air bubbles, thermal cracking, deformation, and so on. These problems will affect the quality and production efficiency of the product, so they need to be solved in time. This article will introduce common problems and solutions in injection molding processing.
1. Short materials
Short material refers to the length of the plastic product that is less than the expected value during the injection molding process. The reason for the short material may be that the pressure of the injection molding machine is not enough, the temperature is not enough, the mold design is unreasonable, etc. The methods to solve the short material include:
1. Increase the pressure and temperature of the injection molding machine to ensure that the plastic fills the entire mold.
2. Check whether the mold design is reasonable, especially whether the size and structure of the mold cavity meet the requirements.
3. Check whether the quality and ratio of plastic raw materials are correct.
2. Bubbles
Bubbles refer to cavities or air bubbles that appear in injection molded products. The cause of the air bubbles may be that the plastic raw materials contain moisture, the pressure of the injection molding machine is insufficient, and the mold design is unreasonable. Ways to resolve bubbles include:
1. Check whether the plastic raw material is dry, if necessary, install a dryer before the injection molding machine.
2. Increase the pressure and temperature of the injection molding machine to ensure that the plastic fills the entire mold.
3. Check whether the mold design is reasonable, especially whether the size and structure of the mold cavity meet the requirements.
3. thermal cracking
Thermal cracking refers to the cracks that occur in injection molded products during cooling. The reason for thermal cracking may be that the temperature of the injection molding machine is too high, the cooling time is too short, and the mold design is unreasonable. Solutions to hot cracking include:
1. Reduce the temperature of the injection molding machine, especially the temperature of the mold.
2. Prolong the cooling time of injection molded products to ensure that the injection molded products are completely cooled.
3. Check whether the mold design is reasonable, especially whether the size and structure of the mold cavity meet the requirements.
4. Deformation
Deformation refers to the change in the shape of an injection molded product during cooling. The reason for the deformation may be that the temperature of the injection molding machine is too high, the cooling time is too short, and the mold design is unreasonable. Methods for addressing distortion include:
1. Reduce the temperature of the injection molding machine, especially the temperature of the mold.
2. Prolong the cooling time of injection molded products to ensure that the injection molded products are completely cooled.
3. Check whether the mold design is reasonable, especially whether the size and structure of the mold cavity meet the requirements.
5. Other issues
In addition to the above common problems, other problems may also occur in injection molding processing, such as color difference, burrs, warping, etc. Ways to address these issues include:
1. Check whether the quality and ratio of plastic raw materials are correct.
2. Check whether the pressure and temperature of the injection molding machine are appropriate.
3. Check whether the mold design is reasonable, especially whether the size and structure of the mold cavity meet the requirements.
4. Check whether the post-processing process of injection molded products is correct.
In short, there are various common problems and solutions in injection molding processing. In actual production, it is necessary to take corresponding measures according to the specific situation to ensure the quality and production efficiency of injection molded products.