There are many bubbles in the middle of biodegradable plastic pepper balls. There are several reasons for bubbles in the middle of biodegradable pepper balls, not only the material problem, but also the mold design problem. The solution should also start from these aspects.

The biodegradable pepper ball material is easy to absorb water, which causes the water content of the degradable plastic pepper ball to exceed the standard. During injection molding, this water will become gas and enter the degradable plastic pepper ball and the inside of the degradable plastic ball to form bubbles. The solution is to fully dry the material, and only the fully dried material can produce qualified biodegradable plastic pepper ball and biodegradable plastic ball without bubbles.