Simply, internal stress is the mutually balanced stress that exists between molecules within a product when no external forces are acting on it. You can imagine it as a piece of plastic being pulled or squeezed from all directions by invisible hands.

One of the common defects of die castings.The die casting alloy liquid shrinks in volume during the cooling and solidification process.

Sandblasting is a surface treatment method that uses high-speed abrasive jets to impact and rub the workpiece surface to clean, remove rust, increase surface roughness, and improve coating adhesion.

In the injection molding process, melt degradation is the key factor that causes various defects such as burn marks, black spots, silver streaks, strength loss, uneven color, abnormal odor, etc. Controlling degradation is one of the core goals of process parameter setting.

In the precision world of mold manufacturing, every step is crucial. Once the mold is designed, high-quality steel forms the skeleton, while sophisticated machining technology is the key to giving the mold its soul. 

Mold sticking phenomenon (mold sticking, adhesion, friction ablation): During the die casting process the alloy adheres to the core, the cavity partially or even the entire cavity.

As the global economy continues to develop, society's demand for a wide range of products is becoming increasingly personalized.

One of the common defects of die castings is shrinkage cavities (shrinkage, porosity). 

PP, commonly known as polypropylene, is also known as "pleated plastic" for its excellent fracture resistance.

As the company continues to develop, the customer base will become more and more diverse, and customer demand for products will become more diversified. We will be exposed to more new surface treatment methods.