In the plastic mold, the flying mold is closed. After the parting surface and slider surface of the mold are processed or discharged, it is necessary to confirm whether the contact between the surfaces is good with red lead. If the contact is not ideal, the fitter will correct it. This process is called flying die, also known as die closing or die closing.

In the process, apply red lead to confirm whether the surface contact is good, and the clamping effect can be directly judged by the uniformity of red lead powder.

Parting surface, mold terminology. Generally speaking, a mold consists of a moving mold and a fixed mold (or a male mold and a female mold). Parting surface refers to the part that can be contacted when they are closed, and it is also the dividing surface that divides the workpiece or die part into die volumes.

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