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Why The Injection Mold need an Exhaust System ?

In the field of injection molding, mold design is crucial as it directly determines the quality and production efficiency of the product. In mold design, a commonly mentioned but not negligible part is the exhaust system. So, why do injection molds need to be equipped with exhaust systems? Is it really not possible to have an exhaust system?

Firstly, we need to understand the basic principles of injection molding. Injection molding is the process of injecting molten plastic into the mold cavity, cooling it down to obtain the desired shape of the product. During this process, the air inside the mold cavity and the gas evaporated by the plastic itself must be smoothly discharged, otherwise it will affect the filling and molding effect of the plastic.

The Importance of Exhaust System

1. Avoid product defects: Without a good exhaust system, the gas inside the mold cavity will be compressed during plastic injection, forming bubbles or gaps, resulting in surface defects, dents, and other issues.

2.Improve production efficiency: Poor exhaust can lead to uneven plastic filling, requiring longer time to ensure that the plastic fills the entire mold cavity. A good exhaust system can ensure that plastic fills the cavity quickly and evenly, shortening the production cycle.

3.Extend mold life: Poor exhaust can cause an increase in internal pressure of the mold, increasing the risk of mold wear and damage. A reasonable exhaust system can reduce the internal pressure of the mold and protect it from damage.

The consequences of not having an exhaust system

If the injection mold is not equipped with an exhaust system, the following problems may occur:

The product quality is unstable and the defect rate is increasing.

Low production efficiency and increased costs.

The risk of mold damage increases and the service life is shortened.

Therefore, in order to ensure the smooth progress of the injection molding process and the stable improvement of product quality, it is essential to set up an exhaust system.