1, the problem of the material itself, the raw material in the rubber, the air is wrapped in the material, resulting in the process of processing, the material and air into the mold, if the mold did not add vent or processing did not set exhaust process, the air is easily trapped in the mold, making the product bubble or air hole.

2. When the machine is storing materials and the screw is winding materials, the air will be sucked into the machine.

3, is also the problem of materials, that is, materials contain more water.

4, during processing, the speed of the injection material is too fast, the formation of turbulence, causing bubbles!