Reasons for blow molding failure of blow molding machine-control factors in hollow blow molding machine
    In the process of blow molding, what factors will cause the failure of blow molding products? Are you often troubled by this situation? There are many parts of the blow machine. Which aspects should be considered? What are the control factors in the hollow blow molding machine? The editor's existence is to help you solve problems! Let's not talk more nonsense, and get to the point.
1. Blow molding failure factor of hollow blow molding machine-blowing pressure
    When making blow-molded products, we have to blow in compressed air for two purposes. One is to inflate the parison to make it close to the inner wall of the cavity and blow out the shape. The second purpose is to play a cooling role! Because in the process of hollowing the parison will be directly deformed due to the action of gravity, which will affect the quality, shape and structure of the product. Of course, there are other factors that affect the cooling of blow molded products. The cooling process and precautions of the blow molding machine are explained in detail in this article.
    Due to the different types of our blow-molded products, the temperature will be different and the compressed gas pressure required will also be different. Generally it is between 0.2-0.7 MPa. Between this value, it is determined according to the actual situation to make the pattern and appearance of the product clear after molding. For large blow molding products, higher blowing pressure will be adopted, and vice versa.
Second, the blow molding failure factor of the hollow blow molding machine-inflation speed
    In order to make the wall thickness of the finished product more uniform and the appearance more smooth and shiny, the blowing time will be shortened, and the inflating speed should be as fast as possible, but also with a degree. Otherwise it will be blown or partially collapsed. The reason is that a vacuum created at the air inlet will cause a depression in this part of the product. When the parison is inflated and molded, the depression becomes a diaphragm.
    On the other hand, it is because the preform at the die site may be broken by the extremely fast airflow. Therefore, it is necessary to switch to a larger blowpipe caliber, or reduce the inflation speed a bit.
Three, blow molding failure factors of hollow blow molding machine-blow up ratio
    Blow-up ratio? The blow-up ratio is the ratio of the maximum diameter of the product to the parison, which mainly refers to the relationship between the maximum radial size of the product and the size of the die in the extruder head. When the size and quality of the produced parison are set, the blow-up ratio will change according to the size of the product. If the inflation ratio is large, the product will be thin, and inflation will be more difficult, but the material is saved. A large blow-up ratio will cause the product to become thicker and increase the consumption of raw materials. It will also reduce the effective volume of the product, prolong the cooling time, and increase the cost. Therefore, the general inflation ratio is between 0.2-0.4.