What are the appearance defects of injection parts?

What are the appearance defects of injection parts?

Appearance defects of injection molded parts can include the following 10 types:

(1) Gas marks: this is due to defects on the surface of the mold, or the injection speed is too fast. Solutions include optimizing the injection speed, lowering the mold temperature, or using more suitable materials.

(2) Flow pattern: this is caused by the uneven flow of plastic in the mold. Methods to solve the flow line include adjusting the injection speed, changing the mold temperature, or changing the type of plastic material.

(3) Fuse connection: This is due to the different parts of the plastic flow in the mold together to form a line. Methods to solve the fuse connection include changing the mold design, such as adding a gate, changing the flow path, or changing the injection speed.

(4) Deformation: this is caused by uneven plastic cooling or improper mold design. Ways to solve the deformation include adjusting the cooling time, changing the mold temperature, or optimizing the mold design.

(5) Bubbles: This is due to the fact that the gas inside the plastic is not completely discharged. Solutions to the bubbles include adjusting the injection speed and time, changing the mold temperature, or using a vacuum exhaust system.

(6) Black spots: This is caused by overheating or pollution of plastics. Solutions include controlling the temperature of the plastic, keeping the raw material clean, or replacing the raw material.

(7) Strain: This is caused by excessive stretching of the plastic when it flows in the mold. Solutions to strain include adjusting the injection speed and time, changing the mold temperature, or optimizing the mold design.

(8) Shrinkage mark: this is due to the plastic cooling too fast, resulting in the formation of surface shrinkage. Methods to solve the shrinkage can include adjusting the cooling time, changing the mold temperature, or optimizing the mold design.

(9) Silver: This is due to the shear force caused by the plastic during the injection process. Solutions include adjusting the injection speed and pressure, changing the mold temperature, or replacing a more suitable material.

(10) Jet pattern: this is due to the plastic at high speed impact mold surface formed. Methods to solve the injection pattern include adjusting the injection speed and pressure, changing the mold temperature, or optimizing the mold design.

The above are the common appearance defects of injection parts and their possible causes and solutions. However, it should be noted that specific solutions need to be adjusted and optimized according to the actual situation.