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Basic Knowledge of Injection Molding

The so-called injection molding refers to a method of injecting heated and molten material into a mold, and then cooling and solidifying to obtain a molded product. The specific process is to feed granular or powdered plastic from the hopper of the injection molding machine into a heated barrel, heat and plasticize it into a molten state, press the screw and inject it into a low-temperature, closed mold through the nozzle at the end of the barrel to cool and cure it into the shape endowed by the cavity. After the mold is opened and the colloid is taken out, a working cycle is completed.


Injection molding is a commonly used method in plastic molding processing. It is suitable for all thermoplastics (thermoplastics: a type of plastic that can be heated and melted and cooled and hardened repeatedly within a specific temperature range, such as ABS, PP, PE, PC, PA , POM) and some thermosetting plastics, most parts of plastic products are manufactured by injection molding.


The molding cycle of injection molding is short (a few seconds to a few minutes), and the quality of molded products can range from a few grams to tens of kilograms. It can form molded products with complex shapes, accurate dimensions, and metal or non-metal inserts at one time. Therefore, the method has strong adaptability and high production efficiency. Therefore, injection molding packaging process is popular in the related indutries.


Injection molding, is a molding method that combines injection and molding. The advantages of injection molding method are fast production speed, high efficiency, operation can be automated, variety of colors, shapes can be from simple to complex, size can be from large to small, and the size of the product is accurate, the product is easy to update, and it can be made into complex shapes. Parts and injection molding are suitable for mass production and molding processing fields such as products with complex shapes. The downside is that the cost of the mold is high and the cleaning is difficult, so it is not suitable to use this method for small batch products.

  • How to Solve the Two Common Problems in Injection Molding?

    Ⅰ. Reasons for the sticking of the main runner during injection molding and its elimination methods1. The cooling time is too short, and the main runner has not yet solidified.2. If the slope of the ...
  • Five Steps of Injection Molding Mold Production Process

    Injection molding mold manufacturing can be roughly divided into the following steps:I. Process analysis of injection molding mold plastic productsBefore designing the mold, the designer should fully ...
  • Two Shot Injection Molding Process

    Two Shot Injection Molding Process

    The cover material is injected above, below, around or inside the substrate during the two shot injection molding process to form a complete part. This process can be done through multiple injections ...