The gases in inner product sets mainly have the following origins:

1. Air stored in the feed system and mold cavity

2. The water vapor generated by the transpiration of plastic at high temperatures

3. Gas generated by plastic differentiation

4. Guessing the gas generated by the evaporation of certain additives or chemical reactions

5. Guess the mixed air and moisture!

The key to the design of the foundation can be summarized as follows:

1. The exhaust should be agile and complete, and the exhaust speed should be suitable for the filling speed;

2. The exhaust groove should be set up as much as possible in the formed parts with thicker rubber parts;

3. The exhaust groove should be set on the parting surface as much as possible;

4. The exhaust groove should be located at the end and collection point of the material flow as much as possible, such as the end of the cold material well;

5. In order to facilitate the production and cleaning of plastic injection molds, the exhaust groove should be located on the concave side of the mold as much as possible;

6. The direction of the exhaust groove should not face the operating surface to prevent material leakage and injury during injection molding;

7. The exhaust groove should not have * corners to prevent the accumulation of cold materials;

8. The size standard of the exhaust groove must be suitable (generally around 0.2-0.3mm in thickness), and the selection and processing should be based on specific information and product requirements to prevent the formation of burrs as much as possible.

Common methods for venting plastic injection molds include:

1. Exhaust groove or hole for exhaust

2. Exhaust from the parting surface

3. Exhaust the gaps in the assembled parts

4. Exhaust the gap between the push rod or ejector pin

5. Powder firing combined with gold block exhaust

6. Set exhaust rod for forced exhaust

7. Use a vacuum exhaust machine to achieve automatic and complete exhaust.