Optimize the Cooling Effects

One of the most effective ways to avoid shrinkage problems in injection molding is to optimize the cooling effects. Cooling channels or plates in the mold design should be used to ensure that the cooling process is uniform throughout the mold cavity. This will help regulate the temperature of the mold and prevent the formation of hot spots, which can cause uneven cooling and shrinkage.

Mold temperature controllers can also help with the cooling effects and maintain a consistent temperature throughout the mold. It is essential to maintain a balance as excessive cooling can cause warpage, which can lead to a defective molded part.

Reduce Wall Thickness Reasonably

Careful design and engineering of the part should be done to ensure that the wall thickness is consistent and optimized for the specific material being used. Thinner walls will result in a shorter cooling time, which will help minimize shrinkage.

However, it is important to note that reducing wall thickness can also cause the part to become more fragile and prone to breakage. Thus, it is essential to strike a balance between wall thickness and overall part strength. Furthermore, other factors such as the mold design and processing parameters can also affect the wall thickness of the molded part.

Reduce the Plasticizing Temperature

Lowering the plasticizing temperature can be done by adjusting the temperature of the plasticizing unit or by using a material with a lower melting point. A reduced plasticizing temperature will decrease the viscosity of the molten plastic, which will reduce the shrinkage caused by uneven cooling.

However, the plasticizing temperature should not be too low as this can cause other defects such as flash or incomplete filling of the mold cavity. It is essential to optimize the plasticizing temperature for the specific material being used to achieve the desired results.