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UNIQUE SOLUTIONS MOLD LIMITED
The air trapping position in cavity and exhaust method

The air trapping position in cavity and exhaust method

The air trapping in cavity is usually in the following places:

1. Thin-wall structure cavity, the end of melt flow;

2. The junction of two or more melts;

3. The last area where the melt in the cavity reaches;

4. The bottom of the blind hole of the mold cavity is mostly the end of a solid column in the part;

5. Reinforcing ribs of molded parts and the bottom of screw pillars;

6. Dead corners of complex mold cavities.


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Exhaust method in injection mold include as following:

1. Parting surface (including venting slot);

2. The fitting surface of insert;

3. The fitting surface of the push rod or pipe with inner mold insert;

4. Exhaust from side core pulling mechanism;

5. Add a vent needle or insert to vent the air in the trapped area;

6. Breathable steel exhaust;

7. Air valve exhaust;

8. The mold is evacuated and exhausted.


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