What is the Process of Molding Plastic?The process of plastic molding varies depending on the specific molding method, but it can be roughly divided into the following steps.

What is the Process of Molding Plastic?

The process of plastic molding varies depending on the specific molding method, but it can be roughly divided into the following steps. The following is a detailed description of injection molding:

Injection molding process

Injection molding, also known as injection molding, is one of the most commonly used methods in plastic processing. Its process mainly includes the following steps:

(1) Mold closing: First, close the mold to form a space for injection molding. This step is the key to ensure that the plastic melt can be accurately injected into the mold cavity.

(2) Filling: Then, the molten plastic is injected into the mold under pressure and stops after filling about 95% of the mold cavity. In this process, the injection pressure and speed need to be controlled to ensure that the plastic can evenly fill the mold cavity.

(3) Holding pressure: After filling, continue to apply a certain amount of pressure to compact the melt, make the molded part structure tight, and reduce internal shrinkage holes and defects.

(4) Cooling: Allow the molded part to cool fully in the mold until it reaches a hardness that can be demolded. The cooling time usually takes up most of the entire process because the plastic needs enough time to solidify.
(5) Demolding: When the molded part cools to a sufficient hardness, the mold opens and the product is ejected with a push rod or a demolding plate. After demolding, the product can be processed or inspected.

Advantages and Disadvantages of Injection Molding

(1) The advantages of injection molding are high production efficiency, the ability to produce plastic parts with complex shapes, and less waste of raw materials.

(2) Its disadvantages are also obvious, such as high mold and injection molding machine costs, which are not suitable for small batch production; at the same time, due to the need for uniform cooling, the thickness of the plastic part is limited.

In summary, the injection molding process is a complex and delicate process that requires strict control of parameters and conditions in each link to ensure the production of high-quality plastic products.