Do you know the reason why rubber products produce bubbles?

In the daily production process, various problems are encountered, and bubbles are a common one. Some bubbles are on the surface of rubber products, while others are inside. There are many reasons for their occurrence. Next, Kexin, a silicone protective cover manufacturer, will share the reasons with you as follows:

1. The problems with the raw materials themselves may be due to poor quality, formulation matching issues, or excessive moisture in the materials (which can be solved by adding some calcium oxide during mixing). It is recommended that the manufacturer eliminate them one by one,

2. Improper operation can lead to insufficient or uneven rubber mixing, which can be avoided by improving the operation manual. A complete and compliant operation manual is the most basic requirement for rubber product manufacturers,

3. The problem of exhaust first needs to be ruled out whether there is a process of setting exhaust during the processing. Secondly, there is a problem with the mold itself. If the mold does not have an exhaust groove, or the exhaust hole design is unreasonable, or if it is blocked by foreign objects, bubbles will also be generated

4. Problems during vulcanization, such as insufficient vulcanization time, insufficient pressure during vulcanization, or high impurities in the vulcanizing agent, can also generate bubbles

5. The product is too thick, which slows down the heat transfer of the rubber. In the end, only the outer surface is vulcanized, while the inside is filled with bubbles

Other suggestions

1. Slow down the injection speed of the material, and excessive injection speed during the processing is also an important reason for the generation of bubbles.

2. We know that the generation of bubbles is due to the entry of air, and the solution is to prevent air from entering. Therefore, a more thorough solution is to replace the vulcanization molding machine with a vacuum molding machine.