Reasons for making the exhaust system of the injection mold

The gas in the injection mold includes not only the air in the cavity, but also the air in the gate and the decomposition gas generated by the plastic melt, and the steam which caused by plastic in high temperatures. During injection molding, these gases should be exhaust in time, otherwise there will be some issues as following:


1. Defects such as flow mark, water mark, and weld marks will be formed on part surface;

2. Defects such as bubbles and loose tissues inside the plastic parts, which will lead to insufficient filling inside plastic part;

3. It is difficult to fill the plastic melt or flash locally;

4. The gas generates high temperature under high temperature and high pressure, causing local carbonization and burnt marks on the product;

5. Reducing the filling speed of the plastic melt, not only the molding cycle is prolonged, but the melt temperature decreases quickly after injection speed dropped, the residual stress will increase, if the injection pressure is increased, and the possibility of warping deformation of the plastic part after demolding will increase, if the material temperature is increased in order to reduce the injection pressure, it will cause the plastic to crack.

   

图片1.png

    

Properly making the exhaust slot can reduce the injection pressure greatly, reduce the injection and the holding time, and reduce the clamping pressure, thereby improving the production efficiency, reducing the production cost, and the energy consumption of the machine. For transparent plastic parts or plastic parts with strict surface requirements, we should be careful with the mold exhaust system design.


Tags: Injection Mold | Injection Mold Supplier | Injection Mold Factory | Mold Factory | Mold Supplier | Injection Molding |
Related News about USM Injection Mold
  • Slider angle designing tips

    Slider angle designing tips

    Dec 4, 20231. Normally, all the insertion slopes of the slider are not allowed to be less than 3° to prevent excessive self-locking force and scratched; 2. The angle of the locking surface must be bigger than...view
  • Unique Solutions Mold Profile

    Unique Solutions Mold Profile

    Dec 27, 2021USM (UNIQUE SOLUTIONS MOLD LIMITED) was founded in 2012 and is located in Dongguan City, Guangdong Province, a famous mold manufacturing province in China, the plant covers an area of 3500 square...view
  • The main design points of the design of the plastic mold pouring system

    The main design points of the design of the plastic mold pouring system

    Jan 11, 2022The main runner is the part where the molten plastic first passes when it is sprayed from the injection nozzle, and it is coaxial with the injection nozzle, because of repeated contact and collision...view
  • The T slot of slider and guider designing tips

    The T slot of slider and guider designing tips

    Dec 18, 20231. The T slot of slot should be designed according to the picture 1, If there is a relatively high slider, the slider T slot is not high enough which will cause the center of gravity to be unstable,...view
  • Design principles of plastic injection mold runner system

    Design principles of plastic injection mold runner system

    Jan 6, 20221. Quality first The design of the gating system has a big influence on part quality, firstly the gate should be set at the easiest part of the plastic part to be removed, and at the same time, the...view
  • The common fixing method of angle pin

    The common fixing method of angle pin

    May 10, 2024The angle pin is a common part of the drive slider, and the fixing and installation methods as following: 1. Pass through the mold plate directly and press the angle pin with the top plate to fix it,...view