As we all know, In the production and mold test , there are often insufficient filling, compressed air burns, high internal stress inside the product, surface flow lines and fusion lines. In addition to these phenomena, in addition to the first adjustment of the injection molding process, it is also necessary to consider whether the mold gate is reasonable. When both the injection molding process and the gate are eliminated, the exhaust of the mold is the main problem. The main means to solve this problem is to open the vent.
Please check below The main role of the exhaust vent:
1. When the mold is glued, the air in the cavity is excluded.
2. It is to exclude various gases generated during the heating process of the rubber compound.
First, the size of the exhaust slot:
There are two points to note when opening the vent:
1. While the exhaust groove is exhausted, its size should be designed to prevent the material from overflowing into the groove.
2. Prevent the venting groove from being blocked.
Exhaust groove width size:
Should be between 4-10mm according to the size of the mold, see Figure 1.
Exhaust groove front end depth dimension A:
To be less than the edge value of the rubber, the length of the front end of the exhaust groove is 3-6mm, see Table 1.
Detach groove rear end depth dimension:
Should be between 0.3-0.6mm according to the size of the mold, as shown in Figure 1.
