What is the reason for the white drawing of injection molding products?
White drawing refers to the appearance of white lines or spots on the surface of the product
It is usually caused by the following four reasons:
(1) Unreasonable mold design: Unreasonable mold design is one of the most common reasons for product pulling. For example, the surface of the mold or core is rough, flawed, or the strength of the core is insufficient, and it is easy to deformation or fracture, resulting in white pulling phenomenon.
(2) Improper injection molding process: improper injection molding process is also one of the reasons for product whitening. For example, the injection speed is too fast or the injection pressure is too large, resulting in the mold specific or core force is too large, resulting in friction and heat, so that the product surface white phenomenon.
(3) Plastic material mismatch: plastic material mismatch is also one of the reasons leading to product white. For example, the fluidity of the plastic material is not good, or its processing temperature is too high, resulting in the material blocking or adhering to the surface of the mold core during the injection process, resulting in the phenomenon of white pulling.
(4) Improper specific selection of core or mold: improper specific selection of core or mold is also one of the reasons leading to product whiteness. For example, the specific hardness of the core or mold is insufficient, or its surface is improperly treated, resulting in adhesion or blockage of the material during the injection molding process, resulting in white pulling.
In summary, there are many reasons for the whitening of injection mold products, which need to be analyzed and solved according to the actual situation. Generally speaking, by improving the mold design, optimizing the injection molding process, selecting the appropriate plastic material and the correct core or mold specific methods, the occurrence of product whitening can be effectively reduced or avoided.
Post time: Oct-30-2023
